Applications of lithium-sulfur(Li-S)batteries are still limited by the sluggish conversion kinetics from polysulfide to Li_(2)S.Although various single-atom catalysts are available for improving the conversion kinetic...Applications of lithium-sulfur(Li-S)batteries are still limited by the sluggish conversion kinetics from polysulfide to Li_(2)S.Although various single-atom catalysts are available for improving the conversion kinetics,the sulfur redox kinetics for Li-S batteries is still not ultrafast.Herein,in this work,a catalyst with dual-single-atom Pt-Co embedded in N-doped carbon nanotubes(Pt&Co@NCNT)was proposed by the atomic layer deposition method to suppress the shuttle effect and synergistically improve the interconversion kinetics from polysulfides to Li_(2)S.The X-ray absorption near edge curves indicated the reversible conversion of Li_(2)Sx on the S/Pt&Co@NCNT electrode.Meanwhile,density functional theory demonstrated that the Pt&Co@NCNT promoted the free energy of the phase transition of sulfur species and reduced the oxidative decomposition energy of Li_(2)S.As a result,the batteries assembled with S/Pt&Co@NCNT electrodes exhibited a high capacity retention of 80%at 100 cycles at a current density of 1.3 mA cm^(−2)(S loading:2.5 mg cm^(−2)).More importantly,an excellent rate performance was achieved with a high capacity of 822.1 mAh g^(−1) at a high current density of 12.7 mA cm^(−2).This work opens a new direction to boost the sulfur redox kinetics for ultrafast Li-S batteries.展开更多
Electromagnetic wave(EMW)-absorbing materials have considerable capacity in the military field and the prevention of EMW radiation from harming human health.However,obtaining lightweight,high-performance,and broadband...Electromagnetic wave(EMW)-absorbing materials have considerable capacity in the military field and the prevention of EMW radiation from harming human health.However,obtaining lightweight,high-performance,and broadband EMW-absorbing material remains an overwhelming challenge.Creating dielectric/magnetic composites with customized structures is a strategy with great promise for the development of high-performance EMW-absorbing materials.Using layered double hydroxides as the precursors of bimetallic alloys and combining them with porous biomass-derived carbon materials is a potential way for constructing multi-interface heterostructures as efficient EMW-absorbing materials because they have synergistic losses,low costs,abundant resources,and light weights.Here,FeNi alloy nanosheet array/Lycopodium spore-derived carbon(FeNi/LSC)was prepared through a simple hydrothermal and carbonization method.FeNi/LSC presents ideal EMW-absorbing performance by benefiting from the FeNi alloy nanosheet array,sponge-like structure,capability for impedance matching,and improved dielectric/magnetic losses.As expected,FeNi/LSC exhibited the minimum reflection loss of-58.3 dB at 1.5 mm with 20wt%filler content and a widely effective absorption bandwidth of 4.92 GHz.FeNi/LSC composites with effective EMW-absorbing performance provide new insights into the customization of biomass-derived composites as high-performance and lightweight broadband EMW-absorbing materials.展开更多
In this study,we have explored the use of water as a non-solvent for tuning the microstructure of poly-benzimidazole(PBI)membranes,which are potential separators for lithium metal batteries(LMBs).The traditional metho...In this study,we have explored the use of water as a non-solvent for tuning the microstructure of poly-benzimidazole(PBI)membranes,which are potential separators for lithium metal batteries(LMBs).The traditional method for membrane synthesis called nonsolvent-induced phase separation(NIPS),usually relies on hazardous and costly organic non-solvents.By dissolving sodium chloride(Nacl)in water,we could adjust the water ionic potency and the exchange speed of the non-solvent with the DMAC solution to change the micropore structure of the PBI membrane.With increasing Nacl concentration,the micro-pores in the PBI membrane transitioned from finger-like to sponge-like morphology.Compared to com-mercial separators like the Celgard separator,the PBI membrane with sponge-like micropores exhibited better regulation of lithium deposition and improved Li^(+) transportation capability due to its good wetta-bility with the electrolyte.Consequently,the PBI membrane-based Li/Li symmetric cell and Li/LiFePO_(4) full cell demonstrated superior performance compared to the Celgard-based ones.This research proposes an eco-friendly and scalable synthetic approach for fabricating commercial separators for LMBs,addressing the issue of lithium dendrite growth and improving overall battery safety and performance.展开更多
This review summarizes and describes the use of curcumin in diagnosis,prevention,and treatment of Alzheimer＇s disease.For diagnosis of Alzheimer＇s disease,amyloid-β and highly phosphorylated tau protein are the maj...This review summarizes and describes the use of curcumin in diagnosis,prevention,and treatment of Alzheimer＇s disease.For diagnosis of Alzheimer＇s disease,amyloid-β and highly phosphorylated tau protein are the major biomarkers.Curcumin was developed as an early diagnostic probe based on its natural fluorescence and high binding affinity to amyloid-β.Because of its multi-target effects,curcumin has protective and preventive effects on many chronic diseases such as cerebrovascular disease,hypertension,and hyperlipidemia.For prevention and treatment of Alzheimer＇s disease,curcumin has been shown to effectively maintain the normal structure and function of cerebral vessels,mitochondria,and synapses,reduce risk factors for a variety of chronic diseases,and decrease the risk of Alzheimer＇s disease.The effect of curcumin on Alzheimer＇s disease involves multiple signaling pathways：anti-amyloid and metal iron chelating properties,antioxidation and anti-inflammatory activities.Indeed,there is a scientific basis for the rational application of curcumin in prevention and treatment of Alzheimer＇s disease.展开更多
ZnC6HsN2O5H2O （NCGZn） has been synthesized, and its functional groups present in the title compound were confirmed by elemental analysis, TG and IR spectral studies. Meanwhile, the crystal of NCGZn was obtained by s...ZnC6HsN2O5H2O （NCGZn） has been synthesized, and its functional groups present in the title compound were confirmed by elemental analysis, TG and IR spectral studies. Meanwhile, the crystal of NCGZn was obtained by slow evaporation of a saturated aqueous solution at room temperature and confirmed by single-crystal X-ray diffraction analysis. It crystallizes in triclinic, space group P21 with a = 5.03220（1）, b = 13.3747（4）, c = 12.9944（4） A, β = 92.987（2）°, V= 873.39（4） A3, Z = 2, CI2H20NaOI2Zn2, Mr = 543.10, Dc = 2.065 g/cm3, F（000） = 552,μ（MoKa） = 2.826 mm-1, R = 0,0422 and wR = 0.1142. In NCGZn, Zn（l） and the symmetry formed Zn（l） ions are connected by five atoms from four NCG.2H anions and a water molecule. A NCG ligand has two carboxylate groups, one connecting a Zn ion, and the other bridgiong two Zn ions. The NCG ligand bridges four Zn ions through the amino group and two carboxylate groups with a water molecule to yield a 3D coordination polymer structure with hydrogen bonds.展开更多
ZnC6HsN2O5·H20 （NCGZn） has been synthesized, and its functional groups present in the title compound were confirmed by elemental analysis, TG and IR spectral studies. Meanwhile, the crystal of NCGZn was obtaine...ZnC6HsN2O5·H20 （NCGZn） has been synthesized, and its functional groups present in the title compound were confirmed by elemental analysis, TG and IR spectral studies. Meanwhile, the crystal of NCGZn was obtained by slow evaporation of a saturated aqueous solution at room temperature and confirmed by single-crystal X-ray diffraction analysis. It crystallizes in triclinic, space group P21 with α= 5.03220（1）, b = 13.3747（4）, c = 12.9944（4） A,β= 92.987（2）°, V= 873.39（4） A^3, Z = 2, C12H20N4O12Zn2, Mr = 543.10, Dc = 2.065 g/cm^3, F（000） = 552,μ（MoKα） = 2.826 mm^-1, R = 0.0422 and wR = 0.1142. In NCGZn, Znl and the symmetry formed Znl ions are connected by five atoms from four NCG-2H anions and a water molecule. A NCG ligand has two carboxylate groups, one connecting a Zn ion, and the other bridgiong two Zn ions. The NCG ligand bridges four Zn ions through the amino group and two carboxylate groups with a water molecule to yield a 3D coordination polymer structure with hydrogen bonds.展开更多
Carbon dots(CDs),emerging carbon materials with unique physical and chemical properties,have drawn extensive attention from researchers.In recent years,many carbon sources have been used as precursors for preparing CD...Carbon dots(CDs),emerging carbon materials with unique physical and chemical properties,have drawn extensive attention from researchers.In recent years,many carbon sources have been used as precursors for preparing CDs.In contrast to other types of precursors,lignin,as a renewable and available source of natural aromatic biopolymers,is believed to be a low-cost precursor for the large-scale preparation of CDs.However,the preparation of CDs with excellent optical properties from lignin has some drawbacks because of the complex structure of lignin.Hence,the methods for preparing the CDs from lignin are summarized in this paper,and the mechanism and physical and chemical properties of lignin-based CDs are discussed.Moreover,some approaches to tuning the optical properties of lignin-based CDs have been proposed.Additionally,the use of lignin-based CDs in the fields of sensing,supercapacitor,bioimaging,anti-counterfeiting,and information encryption is reviewed.展开更多
We adopt the density function theory with generalized approximation by the Beeke exchange plus Lee-Yang-Parr correlation functional to calculate the electronic first-principles band structure of tin-phthalocyanine （S...We adopt the density function theory with generalized approximation by the Beeke exchange plus Lee-Yang-Parr correlation functional to calculate the electronic first-principles band structure of tin-phthalocyanine （SnPc）. The intermolecular interaction related to transport behavior was analyzed from the F-point wave function as well as from the bandwidths and band gaps. From the calculated bandwidths of the frontier bands as well as the effective masses of the electron and hole, it can be concluded that the mobility of the electron is about two times larger than that of the hole. Furthermore, when several bands near the Fermi surface are taken into account, we find that the interband gaps within the unoccupied bands are generally smaller than those of the occupied bands, indicating that the electron can hop from one band to another which is much easier than the hole. This may happen through electron-phonon coupling for instance, thus effectively yielding an even larger mobility for the electron than for the hole. These facts indicate that in SnPc the electrons are the dominant carriers in transport, in contrast to most organic materials.展开更多
Polymers obtained from biomass are promising alternatives to petrobased polymers owing to their low cost,biocompatibility,and biodegradability.Lignin,a complex aromatic polymer containing several functional hydrophili...Polymers obtained from biomass are promising alternatives to petrobased polymers owing to their low cost,biocompatibility,and biodegradability.Lignin,a complex aromatic polymer containing several functional hydrophilic and active groups including hydroxyls,carbonyls,and methoxyls,is the second most abundant biopolymer in plants.In particular,sustainable ligninbased gels are emerging as an appealing material platform for developing energy-and sensing-related applications owing to their attractive and tailorable physiochemical properties.This study describes the preparation strategies of lignin-based gels according to previously reported methods,with significant attention on the diverse performance of lignin-derived gel materials.Additionally,a detailed review of lignin-based gels utilized as an important resource in diverse fields is provided.Finally,a future vision on challenges and their possible solutions is presented.展开更多
Highly efficient photon-to-electron conversion is crucial for achieving photocatalytic conversion.In this study,oxygen-doped carbon nitride nanocages(O@CNNCs)were engineered via dual strategies of morphology-controlle...Highly efficient photon-to-electron conversion is crucial for achieving photocatalytic conversion.In this study,oxygen-doped carbon nitride nanocages(O@CNNCs)were engineered via dual strategies of morphology-controlled heteroatom doping,which was successfully used in the photocatalytic selective oxidation of xylose/xylan to xylonic acid.The nanocage-shaped O@CNNCs had a larger surface area,which was 4.02 times of carbon nitride(CN).Furthermore,with the assistance of morphology regulation and O-doping,O@CNNCs exhibit highly efficient photon-to-electron conversion,enhanced visible-light utilization,high photocurrent,low resistance,and fast separation/migration of electron-hole pairs.Correspondingly,the photocatalytic oxidation of xylose to xylonic acid using O@CNNCs was successfully achieved under mild reaction conditions with a yield of 83.4%.O@CNNCs have excellent recyclability,in which the yield of xylonic acid in the 5th cycle was 98.2%of its initial use.The O@CNNC photocatalytic system was also suitable for macromolecular xylan,and a xylonic acid yield of 77.34 mg was obtained when 100 mg xylan was used.The oxidation-active species captured experiments indicated that holes were crucial for the selective oxidation of xylose to xylonic acid.Overall,this study provides a new strategy for the preparation of photocatalysts with excellent photon-to-electron conversion and selective oxidation of biomass-derived feedstocks to xylonic acid.展开更多
Although biopolymers have been widely utilized as triboelectric materials for the construction of self-powered sensing systems,the annihilation of triboelectric charges at high temperatures restricts the output signal...Although biopolymers have been widely utilized as triboelectric materials for the construction of self-powered sensing systems,the annihilation of triboelectric charges at high temperatures restricts the output signals and sensitivity of the assembled sensors.Herein,a novel chitosan/montmorillonite/lignin(CML)composite film was designed and employed as a tribopositive layer in the assembly of a self-powered sensing system for use under hot conditions(25-70℃).The dense contact surface resulting from the strong intermolecular interaction between biopolymers and nanofillers restrained the volatilization of induced electrons.The optimized CML-TENG delivered the highest open-circuit voltage(V_(oc))of 262 V and maximum instantaneous output power of 429 mW/m^(2).Pristine CH-TENG retained only 39%of its initial Voc at 70℃,whereas the optimized CM_(5)L_(3)-TENG retained 66%of its initial Voc.Our work provides a new strategy for suppressing the annihilation of triboelectric charges at high temperatures,thus boosting the development of self-powered sensing devices for application under hot conditions.展开更多
Although VB-Group transition metal disulfides(TMDs)VS_(2)nanomaterials with specific electronic properties and multiphase microstructures have shown fascinating potential in the field of electro-magnetic wave(EMW)abso...Although VB-Group transition metal disulfides(TMDs)VS_(2)nanomaterials with specific electronic properties and multiphase microstructures have shown fascinating potential in the field of electro-magnetic wave(EMW)absorption,the efficient utilization of VS_(2)is limited by the technical bottleneck of its narrow effective absorption bandwidth(EAB)which is attributed to environmental instability and a deficient electromagnetic(EM)loss mechanism.In order to fully exploit the maximal utilization values of VS_(2)nanomaterials for EMW absorption through mitigating the chemical instability and optimizing the EM parameters,biomass-based glucose derived carbon(GDC)like sugar-coating has been decorated on the surface of stacked VS_(2)nanosheets via a facile hydrothermal method,followed by high-temperature carbonization.As a result,the modulation of doping amount of glucose injection solution(Glucose)could effectively manipulate the encapsulation degree of GDC coating on VS_(2)nanosheets,further imple-menting the EM response mechanisms of the VS_(2)/GDC hybrids(coupling effect of conductive loss,interfacial polarization,relaxation,dipole polarization,defect engineering and multiple reflections and absorptions)through regulating the conductivity and constructing multi-interface heterostructures,as reflected by the enhanced EMW absorption performance to a great extent.The minimum reflection loss(Rmin)of VS_(2)/GDC hybrids could reach52.8 dB with a thickness of 2.7 mm at 12.2 GHz.Surprisingly,compared with pristine VS_(2),the EAB of the VS_(2)/GDC hybrids increased from 2.0 to 5.7 GHz,while their environmental stability was effectively enhanced by virtue of GDC doping.Obviously,this work provides a promising candidate to realize frequency band tunability of EMW absorbers with exceptional perfor-mance and environmental stability.展开更多
The use of functional materials such as carbon-bismuth oxyhalides in integrated photorefineries for the clean production of fine chemicals requires restructuring.A facile biomass-assisted solvothermal fabrication of c...The use of functional materials such as carbon-bismuth oxyhalides in integrated photorefineries for the clean production of fine chemicals requires restructuring.A facile biomass-assisted solvothermal fabrication of carbon/bismuth oxychloride nanocomposites(C/BiOCl)was achieved at various temperatures.Compared with BiOCl and C/BiOCl-120,C/BiOCl-180 exhibited higher crystallinity,wider visible light absorption,and a faster migration/separation rate of photoinduced carriers.For the selective C–C bond cleavage of biomass-based feedstocks photocatalyzed by C/BiOCl-180,the xylose conversion and lactic acid yield were 100%and 92.5%,respectively.C/BiOCl-180 efficiently converted different biomass-based monosaccharides to lactic acid,and the efficiency of pentoses was higher than that of hexoses.Moreover,lactic acid synthesis was favored by all active radicals including superoxide ion(·O_(2)^(−)),holes(h^(+)),hydroxyl radical(·OH),and singlet oxygen(^(1)O_(2)),with·O_(2)^(−)playing a key role.The fabricated photocatalyst was stable,economical,and recyclable.The use of biomass-derived monosaccharides for the clean production of lactic acid via the C/BiOCl-180 photocatalyst has opened new research horizons for the investigation and application of C–C bond cleavage in biomass-based feedstocks.展开更多
Solid polymer electrolytes(SPEs)are considered to be one of the most promising systems applied in all-solid-state lithium metal batteries(ASSLMBs)on account of their chemical and electrochemical ro bustness,mechanical...Solid polymer electrolytes(SPEs)are considered to be one of the most promising systems applied in all-solid-state lithium metal batteries(ASSLMBs)on account of their chemical and electrochemical ro bustness,mechanical stability,cost-effective and scalable manufacturing techniques.Lately,significant en deavors have been directed towards mitigating the formation of the Li dendrite in SPE-based ASSLMBs while research on the inactive lithium in the forms of the solid-electrolyte interface has been rarely re ported.Herein,a bi-functional GaI3additive is developed for in-situ generating Li_(3)Ga alloy for suppressing Li dendrite growth,as well as I3-in recovering dead lithium.Relying on the density functional theory(DFT)results,the Li atom prefers to deposit on the Li_(3)Ga surface and then guide uniform Li deposi tion,while the I3species features a relatively lower lowest unoccupied molecular orbital(LUMO)energy level(-2.12 e V),meaning a higher electron affinity,which is beneficial for reviving inactive lithium to counterbalance the loss of lithium.As a result,in comparison to cells employing pure PEGDME-based electrolytes,the Li-Li symmetric cells utilizing GaI3-containing solid-state electrolyte exhibited a cycling life nearly 30 times longer at a current density/capacity of 0.2 mA/cm^(2),0.2 mAh/cm^(2).The full batterie of LFP//1%GaI3-SPE//40μm Li delivered a noteworthy capacity retention of 82%after 1300 cycles at a rate of 1 C.展开更多
The casual discharge of dyes from industrial settings has seriously polluted global water systems.Owing to the abundance of biomass resources,preparing photocatalysts for photocatalytic degradation of dyes is signific...The casual discharge of dyes from industrial settings has seriously polluted global water systems.Owing to the abundance of biomass resources,preparing photocatalysts for photocatalytic degradation of dyes is significant;however,it still remains challenging.In this work,a cuprous oxide/copper oxide composite was interpenetrated onto carbon nanosheets of cellulose-based flexible carbon aerogels(Cu_(2)O/CuO@CAx)via a simple freeze-drying-calcination method.The introduction of the carbon aerogel effectively prevents the aggregation of the cuprous oxide/copper oxide composite.In addition,Cu_(2)O/CuO@CA0.2 has a larger specific surface area,stronger charge transfer capacity,and lower recombination rate of photogenerated carriers than copper oxide.Moreover,Cu_(2)O/CuO@CA0.2 exhibited high photocatalytic activity in decomposing methylene blue,with a degradation rate reaching up to 99.09% in 60 min.The active oxidation species in the photocatalytic degradation process were systematically investigated by electron spin resonance characterization and poisoning experiments,among which singlet oxygen played a major role.In conclusion,this work provides an effective method for preparing photocatalysts using biomass resources in combination with different metal oxides.It also promotes the development of photocatalytic degradation of dyes.展开更多
The objective of this work is to systematically evaluate the performance of the hydrolysis-based kraft pulping process and associated pulp and black liquor characteristics.Acacia wood chips were auto-hydrolyzed under ...The objective of this work is to systematically evaluate the performance of the hydrolysis-based kraft pulping process and associated pulp and black liquor characteristics.Acacia wood chips were auto-hydrolyzed under various severities,then the hydrolyzed wood chips were kraft pulping.The results indicated that the yield of pulp significantly dropped with intensifying the auto-hydrolysis severity.Meanwhile,the removal rate of pentosan reached 98.6%in the screened pulp at the P-factor of 1000.The fiber length,fines and fiber crimp of the screened pulp were not affected by the auto-hydrolysis treatment.Auto-hydrolyzed pulps deteriorated fibrillation and beating response of the pulp in a refining process.However,fiber length and fines changed obviously after beating treatment.After auto-hydrolysis,the tensile index of the paper matrices decreased,some particle substances were found on the surface of the pulp fiber,and the solid and organic content of the black liquor were improved.展开更多
[Objectives]To explore the neuroprotective effects and mechanism of Longan Aril(LA)effective parts on PC12 cells injured by H2O2.[Methods]The neuroprotective effects of LA were evaluated by the cell viability,SOD and ...[Objectives]To explore the neuroprotective effects and mechanism of Longan Aril(LA)effective parts on PC12 cells injured by H2O2.[Methods]The neuroprotective effects of LA were evaluated by the cell viability,SOD and MDA content,apoptosis assay and relative protein expression of Aβand p-Tau.The neuroprotective mechanism of LA was studied by using metabolomics and network pharmacology,and the expressions of RAS/MEK/ERK signaling pathway-related proteins were detected by western blotting.[Results]LA could improve the cell survival rate and SOD content,and reduce apoptosis and expression of Aβand p-tau.Inhibition of RAS/MEK/ERK signaling pathway is a possible mechanism of LA neuroprotective effects.[Conclusions]LA has a neuroprotective effects in vitro and be likely to inhibit the process of AD by inhibition of RAS/MEK/ERK signalling pathway.展开更多
A novel alginate/poly(acrylic acid/acrylamide)double-network hydrogel composite with silver nanoparticles was successfully fabricated using the sol–gel method.The presence of carboxyl and amide groups in the network ...A novel alginate/poly(acrylic acid/acrylamide)double-network hydrogel composite with silver nanoparticles was successfully fabricated using the sol–gel method.The presence of carboxyl and amide groups in the network structure provided abundant active sites for complexing silver ions,facilitating the in situ reduction and confinement of silver nanoparticles.In batch experiments,the optimal silver loading was 20%,and 5 mmol·L^(–1) of p-nitrophenol was completely degraded in 113 s with a rate constant value of 4.057×10^(−2) s^(–1).In the tap water system and simulated seawater system,the degradation time of p-nitrophenol at the same concentration was 261 and 276 s,respectively,with a conversion rate above 99%.In the fixed-bed experiment,the conversion rate remained above 74%after 3 h at a flowing rate of 7 mL·min^(–1).After 8 cycling tests,the conversion rate remained at 98.7%.Moreover,the catalyst exhibited outstanding performance in the degradation experiment of four typical organic dyes.展开更多
Quasi-solid-state lithium metal batteries(QSSLMBs)assembled with polyvinylidene fluoride(PVDF)are a promising class of next-generation rechargeable batteries due to their safety,high energy density,and superior interf...Quasi-solid-state lithium metal batteries(QSSLMBs)assembled with polyvinylidene fluoride(PVDF)are a promising class of next-generation rechargeable batteries due to their safety,high energy density,and superior interfacial properties.However,PVDF has a series of inherent drawbacks such as low ionic conductivity,ease of crystallization,and hydrophobic character that leading to poor cell properties.To tackle these issues,a lignin-reinforced PVDF electrolyte is proposed in this work to solve these drawbacks of PVDF and enhance the comprehensive performance of QSSBs.The lithophilic polar groups of lignin can promote uniform deposition of Li on the electrodes.Cooperating with the improved mechanical properties can efficiently prevent Li dendrites penetration through the separator.In addition,more active sites provided by lignin can also enhance Li^(+)transport and lead to a faster electrochemical reaction kinetic.Benefitting from the ingenious design,Li symmetric cells with 5%lignin-PVDF quasi-solid-state electrolyte can operate for 900 h at a high current density/capacity of 5 mA·cm^(-2)/5 mAh·cm^(-2),while shortcircuiting occurs after 56 h for the counterpart(pure PVDF).Moreover,a full cell of Li/5%lignin-PVDF/LFP cell demonstrates a high capacity of 96.2 mAh·g^(-1)after 2000 cycles at 10 C.This work is expected to open up promising opportunities to develop other high-energy/power-density QSSLMBs.展开更多
Developing efficient catalysts for organic pollutants degradation is crucial for remediating the current severe water environment,yet remains a great challenge.Herein,we report silver nanoparticles immobilized on an a...Developing efficient catalysts for organic pollutants degradation is crucial for remediating the current severe water environment,yet remains a great challenge.Herein,we report silver nanoparticles immobilized on an amine-functionalized metal-organic framework(MOFs)(Ag/UiO-66-NH_(2))as a robust catalyst for the reduction of 4-nitrophenol(4-NP).The fabricated Ag/UiO-66-NH_(2)catalyst exhibits the merits of superior activities(high turnover frequency(TOF)3.2×10^(4)h^(-1)and k value 6.9×10^(-2)s^(-1)),costeffectiveness under the lowest NaBH4 concentration(n[NaBH_(4)]/n[4-NP],200),outstanding cyclability(10 recycling runs),and observable long-term durability,significantly outperforming previously reported catalytic system.The excellent degradation efficiency is ascribed to the favorable microenvironment modulation of unique MOF structure,which regulates the intrinsic properties of active sites and improves the electron-transfer process.Notably,the Ag/UiO-66-NH_(2)also promotes the catalytic degradation of several organic pollutants at room temperature and hence could find a broad application for water remediation.This work offers a new avenue for the development of high-performance MOF-based catalysts with excellent activity and durability.展开更多
基金supported by the National Natural Science Foundation of China(22208039)the Basic Scientific Research Project of the Educational Department of Liaoning Province(LJKMZ20220878)+1 种基金and the Dalian Science and Technology Talent Innovation Support Plan(2022RQ036)supported by the Natural Science and Engineering Research Council of Canada(NSERC),the Canada Research Chair Program(CRC),the Canada Foundation for Innovation(CFI),and Western University。
文摘Applications of lithium-sulfur(Li-S)batteries are still limited by the sluggish conversion kinetics from polysulfide to Li_(2)S.Although various single-atom catalysts are available for improving the conversion kinetics,the sulfur redox kinetics for Li-S batteries is still not ultrafast.Herein,in this work,a catalyst with dual-single-atom Pt-Co embedded in N-doped carbon nanotubes(Pt&Co@NCNT)was proposed by the atomic layer deposition method to suppress the shuttle effect and synergistically improve the interconversion kinetics from polysulfides to Li_(2)S.The X-ray absorption near edge curves indicated the reversible conversion of Li_(2)Sx on the S/Pt&Co@NCNT electrode.Meanwhile,density functional theory demonstrated that the Pt&Co@NCNT promoted the free energy of the phase transition of sulfur species and reduced the oxidative decomposition energy of Li_(2)S.As a result,the batteries assembled with S/Pt&Co@NCNT electrodes exhibited a high capacity retention of 80%at 100 cycles at a current density of 1.3 mA cm^(−2)(S loading:2.5 mg cm^(−2)).More importantly,an excellent rate performance was achieved with a high capacity of 822.1 mAh g^(−1) at a high current density of 12.7 mA cm^(−2).This work opens a new direction to boost the sulfur redox kinetics for ultrafast Li-S batteries.
基金financial support from the National Natural Science Foundation of China(Nos.21776026,22075034,and 22178037)the Liaoning Revitalization Talents Program,China(Nos.XLYC1902037 and XLYC2002114)the Natural Science Foundation of Liaoning Province of China(No.2021-MS-303)。
文摘Electromagnetic wave(EMW)-absorbing materials have considerable capacity in the military field and the prevention of EMW radiation from harming human health.However,obtaining lightweight,high-performance,and broadband EMW-absorbing material remains an overwhelming challenge.Creating dielectric/magnetic composites with customized structures is a strategy with great promise for the development of high-performance EMW-absorbing materials.Using layered double hydroxides as the precursors of bimetallic alloys and combining them with porous biomass-derived carbon materials is a potential way for constructing multi-interface heterostructures as efficient EMW-absorbing materials because they have synergistic losses,low costs,abundant resources,and light weights.Here,FeNi alloy nanosheet array/Lycopodium spore-derived carbon(FeNi/LSC)was prepared through a simple hydrothermal and carbonization method.FeNi/LSC presents ideal EMW-absorbing performance by benefiting from the FeNi alloy nanosheet array,sponge-like structure,capability for impedance matching,and improved dielectric/magnetic losses.As expected,FeNi/LSC exhibited the minimum reflection loss of-58.3 dB at 1.5 mm with 20wt%filler content and a widely effective absorption bandwidth of 4.92 GHz.FeNi/LSC composites with effective EMW-absorbing performance provide new insights into the customization of biomass-derived composites as high-performance and lightweight broadband EMW-absorbing materials.
基金supported by the funding from the Natural Science Foundation of China (22105129)the Guangdong Basic and Applied Basic Research Foundation (2022A1515011048,2022A1515010670)the Science and Technology Innovation Commission of Shenzhen (JCYJ20200109105618137,20200812112006001)
文摘In this study,we have explored the use of water as a non-solvent for tuning the microstructure of poly-benzimidazole(PBI)membranes,which are potential separators for lithium metal batteries(LMBs).The traditional method for membrane synthesis called nonsolvent-induced phase separation(NIPS),usually relies on hazardous and costly organic non-solvents.By dissolving sodium chloride(Nacl)in water,we could adjust the water ionic potency and the exchange speed of the non-solvent with the DMAC solution to change the micropore structure of the PBI membrane.With increasing Nacl concentration,the micro-pores in the PBI membrane transitioned from finger-like to sponge-like morphology.Compared to com-mercial separators like the Celgard separator,the PBI membrane with sponge-like micropores exhibited better regulation of lithium deposition and improved Li^(+) transportation capability due to its good wetta-bility with the electrolyte.Consequently,the PBI membrane-based Li/Li symmetric cell and Li/LiFePO_(4) full cell demonstrated superior performance compared to the Celgard-based ones.This research proposes an eco-friendly and scalable synthetic approach for fabricating commercial separators for LMBs,addressing the issue of lithium dendrite growth and improving overall battery safety and performance.
基金supported by a grant from the Department of Education of Guangdong Province of China,No.2016KCXTD005
文摘This review summarizes and describes the use of curcumin in diagnosis,prevention,and treatment of Alzheimer＇s disease.For diagnosis of Alzheimer＇s disease,amyloid-β and highly phosphorylated tau protein are the major biomarkers.Curcumin was developed as an early diagnostic probe based on its natural fluorescence and high binding affinity to amyloid-β.Because of its multi-target effects,curcumin has protective and preventive effects on many chronic diseases such as cerebrovascular disease,hypertension,and hyperlipidemia.For prevention and treatment of Alzheimer＇s disease,curcumin has been shown to effectively maintain the normal structure and function of cerebral vessels,mitochondria,and synapses,reduce risk factors for a variety of chronic diseases,and decrease the risk of Alzheimer＇s disease.The effect of curcumin on Alzheimer＇s disease involves multiple signaling pathways：anti-amyloid and metal iron chelating properties,antioxidation and anti-inflammatory activities.Indeed,there is a scientific basis for the rational application of curcumin in prevention and treatment of Alzheimer＇s disease.
基金Supported by the Chinese Academy of Sciences comprehensive strategic cooperation project of Guangdong Province(2013B09150009,2013B090900007)
文摘ZnC6HsN2O5H2O （NCGZn） has been synthesized, and its functional groups present in the title compound were confirmed by elemental analysis, TG and IR spectral studies. Meanwhile, the crystal of NCGZn was obtained by slow evaporation of a saturated aqueous solution at room temperature and confirmed by single-crystal X-ray diffraction analysis. It crystallizes in triclinic, space group P21 with a = 5.03220（1）, b = 13.3747（4）, c = 12.9944（4） A, β = 92.987（2）°, V= 873.39（4） A3, Z = 2, CI2H20NaOI2Zn2, Mr = 543.10, Dc = 2.065 g/cm3, F（000） = 552,μ（MoKa） = 2.826 mm-1, R = 0,0422 and wR = 0.1142. In NCGZn, Zn（l） and the symmetry formed Zn（l） ions are connected by five atoms from four NCG.2H anions and a water molecule. A NCG ligand has two carboxylate groups, one connecting a Zn ion, and the other bridgiong two Zn ions. The NCG ligand bridges four Zn ions through the amino group and two carboxylate groups with a water molecule to yield a 3D coordination polymer structure with hydrogen bonds.
基金Supported by the the Chinese Academy of Sciences comprehensive strategic cooperation project of Guangdong Province(2013B091500095,2013B090900007)
文摘ZnC6HsN2O5·H20 （NCGZn） has been synthesized, and its functional groups present in the title compound were confirmed by elemental analysis, TG and IR spectral studies. Meanwhile, the crystal of NCGZn was obtained by slow evaporation of a saturated aqueous solution at room temperature and confirmed by single-crystal X-ray diffraction analysis. It crystallizes in triclinic, space group P21 with α= 5.03220（1）, b = 13.3747（4）, c = 12.9944（4） A,β= 92.987（2）°, V= 873.39（4） A^3, Z = 2, C12H20N4O12Zn2, Mr = 543.10, Dc = 2.065 g/cm^3, F（000） = 552,μ（MoKα） = 2.826 mm^-1, R = 0.0422 and wR = 0.1142. In NCGZn, Znl and the symmetry formed Znl ions are connected by five atoms from four NCG-2H anions and a water molecule. A NCG ligand has two carboxylate groups, one connecting a Zn ion, and the other bridgiong two Zn ions. The NCG ligand bridges four Zn ions through the amino group and two carboxylate groups with a water molecule to yield a 3D coordination polymer structure with hydrogen bonds.
基金supported by grants from the National Natural Science Foundation (22078036)China Postdoctoral Science Foundation (2021M691106)+1 种基金Shandong Postdoctoral Innovation Project (202102050)the Foundation (KF202022) of Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education of China, and Liaoning Bai Qian Wan Talents Program
文摘Carbon dots(CDs),emerging carbon materials with unique physical and chemical properties,have drawn extensive attention from researchers.In recent years,many carbon sources have been used as precursors for preparing CDs.In contrast to other types of precursors,lignin,as a renewable and available source of natural aromatic biopolymers,is believed to be a low-cost precursor for the large-scale preparation of CDs.However,the preparation of CDs with excellent optical properties from lignin has some drawbacks because of the complex structure of lignin.Hence,the methods for preparing the CDs from lignin are summarized in this paper,and the mechanism and physical and chemical properties of lignin-based CDs are discussed.Moreover,some approaches to tuning the optical properties of lignin-based CDs have been proposed.Additionally,the use of lignin-based CDs in the fields of sensing,supercapacitor,bioimaging,anti-counterfeiting,and information encryption is reviewed.
文摘We adopt the density function theory with generalized approximation by the Beeke exchange plus Lee-Yang-Parr correlation functional to calculate the electronic first-principles band structure of tin-phthalocyanine （SnPc）. The intermolecular interaction related to transport behavior was analyzed from the F-point wave function as well as from the bandwidths and band gaps. From the calculated bandwidths of the frontier bands as well as the effective masses of the electron and hole, it can be concluded that the mobility of the electron is about two times larger than that of the hole. Furthermore, when several bands near the Fermi surface are taken into account, we find that the interband gaps within the unoccupied bands are generally smaller than those of the occupied bands, indicating that the electron can hop from one band to another which is much easier than the hole. This may happen through electron-phonon coupling for instance, thus effectively yielding an even larger mobility for the electron than for the hole. These facts indicate that in SnPc the electrons are the dominant carriers in transport, in contrast to most organic materials.
基金supported by grants from the National Natural Science Foundation of China(22108023)NSFC-CONICFT Joint Project(No.51961125207),Innovation Support Program for Highlevel Talents of Dalian(Top and Leading Talents)(201913)+3 种基金Liaoning Province“Xingliao Talent Plan”Outstanding Talent Project(XLYC1901004)Scientific Research Startup Funds for High-level Talents of Dalian Polytechnic University(6102072112)Natural Science Foundation of Liaoning Province(2021-BS-227)the State Key Laboratory of Pulp and Paper Engineering(South China University of Technology,No.202202).
文摘Polymers obtained from biomass are promising alternatives to petrobased polymers owing to their low cost,biocompatibility,and biodegradability.Lignin,a complex aromatic polymer containing several functional hydrophilic and active groups including hydroxyls,carbonyls,and methoxyls,is the second most abundant biopolymer in plants.In particular,sustainable ligninbased gels are emerging as an appealing material platform for developing energy-and sensing-related applications owing to their attractive and tailorable physiochemical properties.This study describes the preparation strategies of lignin-based gels according to previously reported methods,with significant attention on the diverse performance of lignin-derived gel materials.Additionally,a detailed review of lignin-based gels utilized as an important resource in diverse fields is provided.Finally,a future vision on challenges and their possible solutions is presented.
基金supported by the National Natural Science Foundation of China(22008018)the China Postdoctoral Science Foundation(2020M670716).
文摘Highly efficient photon-to-electron conversion is crucial for achieving photocatalytic conversion.In this study,oxygen-doped carbon nitride nanocages(O@CNNCs)were engineered via dual strategies of morphology-controlled heteroatom doping,which was successfully used in the photocatalytic selective oxidation of xylose/xylan to xylonic acid.The nanocage-shaped O@CNNCs had a larger surface area,which was 4.02 times of carbon nitride(CN).Furthermore,with the assistance of morphology regulation and O-doping,O@CNNCs exhibit highly efficient photon-to-electron conversion,enhanced visible-light utilization,high photocurrent,low resistance,and fast separation/migration of electron-hole pairs.Correspondingly,the photocatalytic oxidation of xylose to xylonic acid using O@CNNCs was successfully achieved under mild reaction conditions with a yield of 83.4%.O@CNNCs have excellent recyclability,in which the yield of xylonic acid in the 5th cycle was 98.2%of its initial use.The O@CNNC photocatalytic system was also suitable for macromolecular xylan,and a xylonic acid yield of 77.34 mg was obtained when 100 mg xylan was used.The oxidation-active species captured experiments indicated that holes were crucial for the selective oxidation of xylose to xylonic acid.Overall,this study provides a new strategy for the preparation of photocatalysts with excellent photon-to-electron conversion and selective oxidation of biomass-derived feedstocks to xylonic acid.
基金grateful for the financial support from the National Natural Science Foundation of China(Nos.22208038,22278047,and 22208040)the Liaoning Revitalization Talent Program,China(No.XLYC2002024)the Fundamental Research Funds for the Universities of Liaoning Province,China(No.LJBKY2024055).
文摘Although biopolymers have been widely utilized as triboelectric materials for the construction of self-powered sensing systems,the annihilation of triboelectric charges at high temperatures restricts the output signals and sensitivity of the assembled sensors.Herein,a novel chitosan/montmorillonite/lignin(CML)composite film was designed and employed as a tribopositive layer in the assembly of a self-powered sensing system for use under hot conditions(25-70℃).The dense contact surface resulting from the strong intermolecular interaction between biopolymers and nanofillers restrained the volatilization of induced electrons.The optimized CML-TENG delivered the highest open-circuit voltage(V_(oc))of 262 V and maximum instantaneous output power of 429 mW/m^(2).Pristine CH-TENG retained only 39%of its initial Voc at 70℃,whereas the optimized CM_(5)L_(3)-TENG retained 66%of its initial Voc.Our work provides a new strategy for suppressing the annihilation of triboelectric charges at high temperatures,thus boosting the development of self-powered sensing devices for application under hot conditions.
基金supported by the National Natural Science Foundation of China(52102368,52072192,51977009)Regional Joint Fund for Basic Research and Applied Basic Research of Guangdong Province(No.2020SA001515110905).
文摘Although VB-Group transition metal disulfides(TMDs)VS_(2)nanomaterials with specific electronic properties and multiphase microstructures have shown fascinating potential in the field of electro-magnetic wave(EMW)absorption,the efficient utilization of VS_(2)is limited by the technical bottleneck of its narrow effective absorption bandwidth(EAB)which is attributed to environmental instability and a deficient electromagnetic(EM)loss mechanism.In order to fully exploit the maximal utilization values of VS_(2)nanomaterials for EMW absorption through mitigating the chemical instability and optimizing the EM parameters,biomass-based glucose derived carbon(GDC)like sugar-coating has been decorated on the surface of stacked VS_(2)nanosheets via a facile hydrothermal method,followed by high-temperature carbonization.As a result,the modulation of doping amount of glucose injection solution(Glucose)could effectively manipulate the encapsulation degree of GDC coating on VS_(2)nanosheets,further imple-menting the EM response mechanisms of the VS_(2)/GDC hybrids(coupling effect of conductive loss,interfacial polarization,relaxation,dipole polarization,defect engineering and multiple reflections and absorptions)through regulating the conductivity and constructing multi-interface heterostructures,as reflected by the enhanced EMW absorption performance to a great extent.The minimum reflection loss(Rmin)of VS_(2)/GDC hybrids could reach52.8 dB with a thickness of 2.7 mm at 12.2 GHz.Surprisingly,compared with pristine VS_(2),the EAB of the VS_(2)/GDC hybrids increased from 2.0 to 5.7 GHz,while their environmental stability was effectively enhanced by virtue of GDC doping.Obviously,this work provides a promising candidate to realize frequency band tunability of EMW absorbers with exceptional perfor-mance and environmental stability.
基金supported by the Foundation of the NSFC-CONICFT Joint Project(Grant No.51961125207)National Natural Science Foundation of China(Grant No.22008018)+1 种基金Innovation Support Program for High-level Talents of Dalian(Top and Leading Talents)(Grant No.201913)Dalian City Outstanding Talent Project(Grant No.2019RD13).
文摘The use of functional materials such as carbon-bismuth oxyhalides in integrated photorefineries for the clean production of fine chemicals requires restructuring.A facile biomass-assisted solvothermal fabrication of carbon/bismuth oxychloride nanocomposites(C/BiOCl)was achieved at various temperatures.Compared with BiOCl and C/BiOCl-120,C/BiOCl-180 exhibited higher crystallinity,wider visible light absorption,and a faster migration/separation rate of photoinduced carriers.For the selective C–C bond cleavage of biomass-based feedstocks photocatalyzed by C/BiOCl-180,the xylose conversion and lactic acid yield were 100%and 92.5%,respectively.C/BiOCl-180 efficiently converted different biomass-based monosaccharides to lactic acid,and the efficiency of pentoses was higher than that of hexoses.Moreover,lactic acid synthesis was favored by all active radicals including superoxide ion(·O_(2)^(−)),holes(h^(+)),hydroxyl radical(·OH),and singlet oxygen(^(1)O_(2)),with·O_(2)^(−)playing a key role.The fabricated photocatalyst was stable,economical,and recyclable.The use of biomass-derived monosaccharides for the clean production of lactic acid via the C/BiOCl-180 photocatalyst has opened new research horizons for the investigation and application of C–C bond cleavage in biomass-based feedstocks.
基金supported by the National Natural Science Foundation of China.(Nos.22208039,51961125207)the Basic Scientific Research Project of the Educational Department of Liaoning Province(No.LJKMZ20220878)+1 种基金the Dalian Science and Technology Talent Innovation Support Plan(No.2022RQ036)the Dalian Polytechnic University(Nos.6102072202,2023044)。
文摘Solid polymer electrolytes(SPEs)are considered to be one of the most promising systems applied in all-solid-state lithium metal batteries(ASSLMBs)on account of their chemical and electrochemical ro bustness,mechanical stability,cost-effective and scalable manufacturing techniques.Lately,significant en deavors have been directed towards mitigating the formation of the Li dendrite in SPE-based ASSLMBs while research on the inactive lithium in the forms of the solid-electrolyte interface has been rarely re ported.Herein,a bi-functional GaI3additive is developed for in-situ generating Li_(3)Ga alloy for suppressing Li dendrite growth,as well as I3-in recovering dead lithium.Relying on the density functional theory(DFT)results,the Li atom prefers to deposit on the Li_(3)Ga surface and then guide uniform Li deposi tion,while the I3species features a relatively lower lowest unoccupied molecular orbital(LUMO)energy level(-2.12 e V),meaning a higher electron affinity,which is beneficial for reviving inactive lithium to counterbalance the loss of lithium.As a result,in comparison to cells employing pure PEGDME-based electrolytes,the Li-Li symmetric cells utilizing GaI3-containing solid-state electrolyte exhibited a cycling life nearly 30 times longer at a current density/capacity of 0.2 mA/cm^(2),0.2 mAh/cm^(2).The full batterie of LFP//1%GaI3-SPE//40μm Li delivered a noteworthy capacity retention of 82%after 1300 cycles at a rate of 1 C.
基金This work was supported by the Foundation of National Natural Science Foundation of China(Grant No.22008018)NSFC-CONICFT Joint Project(Grant No.51961125207)+7 种基金China Postdoctoral Science Foundation(Grant No.2020M670716)Liaoning Province“Xingliao Talent Plan”Outstanding Talent Project(Grant No.XL YC1901004)Innovation Support Program for High-level Talents of Dalian(Top and Leading Talents)(Grant No.201913)the Foundation of Guangxi Key Laboratory of Clean Pulp&Papermaking and Pollution Control,College of Light Industry and Food Engineering,Guangxi University(Grant No.2021KF08)Dalian City Outstanding Talent Project(Grant No.2019RD13)Start-up Fund for Doctoral Research of Dalian Polytechnic University(Grant No.2020-07)the Foundation of State Key Laboratory of Biobased Material and Green Papermaking(Grant No.KF201914)Qilu University of Technology,Shandong Academy of Sciences,and the Foundation of Key Laboratory of State Forestry and Grassland Administration for Plant Fiber Functional Materials(Grant No.2020KFJJ06).
文摘The casual discharge of dyes from industrial settings has seriously polluted global water systems.Owing to the abundance of biomass resources,preparing photocatalysts for photocatalytic degradation of dyes is significant;however,it still remains challenging.In this work,a cuprous oxide/copper oxide composite was interpenetrated onto carbon nanosheets of cellulose-based flexible carbon aerogels(Cu_(2)O/CuO@CAx)via a simple freeze-drying-calcination method.The introduction of the carbon aerogel effectively prevents the aggregation of the cuprous oxide/copper oxide composite.In addition,Cu_(2)O/CuO@CA0.2 has a larger specific surface area,stronger charge transfer capacity,and lower recombination rate of photogenerated carriers than copper oxide.Moreover,Cu_(2)O/CuO@CA0.2 exhibited high photocatalytic activity in decomposing methylene blue,with a degradation rate reaching up to 99.09% in 60 min.The active oxidation species in the photocatalytic degradation process were systematically investigated by electron spin resonance characterization and poisoning experiments,among which singlet oxygen played a major role.In conclusion,this work provides an effective method for preparing photocatalysts using biomass resources in combination with different metal oxides.It also promotes the development of photocatalytic degradation of dyes.
基金supported by Natural Science Foundation of China(No.31971608)Natural Science Foundation of Liaoning Province(No.2019-ZD-0125)+1 种基金Liaoning Baiqianwan Talents Program(No.2019)Innovative Talents in Liaoning Uni-versities and Colleges(No.2020).
文摘The objective of this work is to systematically evaluate the performance of the hydrolysis-based kraft pulping process and associated pulp and black liquor characteristics.Acacia wood chips were auto-hydrolyzed under various severities,then the hydrolyzed wood chips were kraft pulping.The results indicated that the yield of pulp significantly dropped with intensifying the auto-hydrolysis severity.Meanwhile,the removal rate of pentosan reached 98.6%in the screened pulp at the P-factor of 1000.The fiber length,fines and fiber crimp of the screened pulp were not affected by the auto-hydrolysis treatment.Auto-hydrolyzed pulps deteriorated fibrillation and beating response of the pulp in a refining process.However,fiber length and fines changed obviously after beating treatment.After auto-hydrolysis,the tensile index of the paper matrices decreased,some particle substances were found on the surface of the pulp fiber,and the solid and organic content of the black liquor were improved.
基金Liaoning Natural Science Foundation(20180530033)Open Fund of Key Laboratory of Ministry of Education for TCM Viscera-State Theory and Applications,Liaoning University of Traditional Chinese Medicine。
文摘[Objectives]To explore the neuroprotective effects and mechanism of Longan Aril(LA)effective parts on PC12 cells injured by H2O2.[Methods]The neuroprotective effects of LA were evaluated by the cell viability,SOD and MDA content,apoptosis assay and relative protein expression of Aβand p-Tau.The neuroprotective mechanism of LA was studied by using metabolomics and network pharmacology,and the expressions of RAS/MEK/ERK signaling pathway-related proteins were detected by western blotting.[Results]LA could improve the cell survival rate and SOD content,and reduce apoptosis and expression of Aβand p-tau.Inhibition of RAS/MEK/ERK signaling pathway is a possible mechanism of LA neuroprotective effects.[Conclusions]LA has a neuroprotective effects in vitro and be likely to inhibit the process of AD by inhibition of RAS/MEK/ERK signalling pathway.
基金This research was financially supported by the National Natural Science Foundation of China(Grant Nos.21776026,22075034,and 22178037)Liaoning Revitalization Talents Program(Grant Nos.XLYC1902037 and XLYC2002114)Natural Science Foundation of Liaoning Province of China(Grant No.2021-MS-303).
文摘A novel alginate/poly(acrylic acid/acrylamide)double-network hydrogel composite with silver nanoparticles was successfully fabricated using the sol–gel method.The presence of carboxyl and amide groups in the network structure provided abundant active sites for complexing silver ions,facilitating the in situ reduction and confinement of silver nanoparticles.In batch experiments,the optimal silver loading was 20%,and 5 mmol·L^(–1) of p-nitrophenol was completely degraded in 113 s with a rate constant value of 4.057×10^(−2) s^(–1).In the tap water system and simulated seawater system,the degradation time of p-nitrophenol at the same concentration was 261 and 276 s,respectively,with a conversion rate above 99%.In the fixed-bed experiment,the conversion rate remained above 74%after 3 h at a flowing rate of 7 mL·min^(–1).After 8 cycling tests,the conversion rate remained at 98.7%.Moreover,the catalyst exhibited outstanding performance in the degradation experiment of four typical organic dyes.
基金financially supported by the National Natural Science Foundation of China(No.22208039)the Basic Scientific Research Project of the Educational Department of Liaoning Province(No.LJKMZ20220878)+1 种基金the Dalian Science and Technology Talent Innovation Support Plan(No.2022RQ036)Dalian Polytechnic University(No.222002023044,No.6102072202)。
文摘Quasi-solid-state lithium metal batteries(QSSLMBs)assembled with polyvinylidene fluoride(PVDF)are a promising class of next-generation rechargeable batteries due to their safety,high energy density,and superior interfacial properties.However,PVDF has a series of inherent drawbacks such as low ionic conductivity,ease of crystallization,and hydrophobic character that leading to poor cell properties.To tackle these issues,a lignin-reinforced PVDF electrolyte is proposed in this work to solve these drawbacks of PVDF and enhance the comprehensive performance of QSSBs.The lithophilic polar groups of lignin can promote uniform deposition of Li on the electrodes.Cooperating with the improved mechanical properties can efficiently prevent Li dendrites penetration through the separator.In addition,more active sites provided by lignin can also enhance Li^(+)transport and lead to a faster electrochemical reaction kinetic.Benefitting from the ingenious design,Li symmetric cells with 5%lignin-PVDF quasi-solid-state electrolyte can operate for 900 h at a high current density/capacity of 5 mA·cm^(-2)/5 mAh·cm^(-2),while shortcircuiting occurs after 56 h for the counterpart(pure PVDF).Moreover,a full cell of Li/5%lignin-PVDF/LFP cell demonstrates a high capacity of 96.2 mAh·g^(-1)after 2000 cycles at 10 C.This work is expected to open up promising opportunities to develop other high-energy/power-density QSSLMBs.
基金the National Natural Science Foundation of China(No.51961125207)Dalian Support Plan for Innovation of High-level Talents(Nos.2019RQ034 and 2019RD13)+2 种基金Liaoning Revitalization Talents Program(Nos.XLYC2007104 and XLYC1901004)Opening Project of Guangxi Key Laboratory of Clean Pulp&Papermaking and Pollution Control(No.2019KF14)Liaoning Baiqianwan Talents Program(No.2021921087).
文摘Developing efficient catalysts for organic pollutants degradation is crucial for remediating the current severe water environment,yet remains a great challenge.Herein,we report silver nanoparticles immobilized on an amine-functionalized metal-organic framework(MOFs)(Ag/UiO-66-NH_(2))as a robust catalyst for the reduction of 4-nitrophenol(4-NP).The fabricated Ag/UiO-66-NH_(2)catalyst exhibits the merits of superior activities(high turnover frequency(TOF)3.2×10^(4)h^(-1)and k value 6.9×10^(-2)s^(-1)),costeffectiveness under the lowest NaBH4 concentration(n[NaBH_(4)]/n[4-NP],200),outstanding cyclability(10 recycling runs),and observable long-term durability,significantly outperforming previously reported catalytic system.The excellent degradation efficiency is ascribed to the favorable microenvironment modulation of unique MOF structure,which regulates the intrinsic properties of active sites and improves the electron-transfer process.Notably,the Ag/UiO-66-NH_(2)also promotes the catalytic degradation of several organic pollutants at room temperature and hence could find a broad application for water remediation.This work offers a new avenue for the development of high-performance MOF-based catalysts with excellent activity and durability.
