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Construction of TiO_(2)-pillared multilayer graphene nanocomposites as efficient photocatalysts for ciprofloxacin degradation 被引量:8
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作者 Xiong-feng Zeng Jian-sheng Wang +2 位作者 Ying-na Zhao Wen-li Zhang Meng-huan Wang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2021年第3期503-510,共8页
We successfully constructed TiO_(2)-pillared multilayer graphene nanocomposites(T-MLGs)via a facile method as follows:dodecanediamine pre-pillaring,ion exchange(Ti4+pillaring),and interlayer in-situ formation of TiO_(... We successfully constructed TiO_(2)-pillared multilayer graphene nanocomposites(T-MLGs)via a facile method as follows:dodecanediamine pre-pillaring,ion exchange(Ti4+pillaring),and interlayer in-situ formation of TiO_(2) by hydrothermal method.TiO_(2) nanoparticles were distributed uniformly on the graphene interlayer.The special structure combined the advantages of graphene and TiO_(2) nanoparticles.As a result,T-MLGs with 64.3wt%TiO_(2) showed the optimum photodegradation rate and adsorption capabilities toward ciprofloxacin.The photodegradation rate of T-MLGs with 64.3wt%TiO_(2) was 78%under light-emitting diode light irradiation for 150 min.Meanwhile,the pseudofirst-order rate constant of T-MLGs with 64.3wt%TiO_(2) was 3.89 times than that of pristine TiO_(2).The composites also exhibited high stability and reusability after five consecutive photocatalytic tests.This work provides a facile method to synthesize semiconductor-pillared graphene nanocomposites by replacing TiO_(2) nanoparticles with other nanoparticles and a feasible means for sustainable utilization of photocatalysts in wastewater control. 展开更多
关键词 pillared structure titanium dioxide-pillared multilayer graphene nanocomposites photocatalysis CIPROFLOXACIN
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Partial Atomic Tin Nanocomplex Pillared Few-Layered Ti_(3)C_(2)Tx MXenes for Superior Lithium-Ion Storage 被引量:8
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作者 Shunlong Zhang Hangjun Ying +2 位作者 Bin Yuan Renzong Hu Wei-Qiang Han 《Nano-Micro Letters》 SCIE EI CAS CSCD 2020年第6期176-189,共14页
MXenes have attracted great interest in various fields,and pillared MXenes open a new path with larger interlayer spacing.However,the further study of pillared MXenes is blocked at multilayered state due to serious re... MXenes have attracted great interest in various fields,and pillared MXenes open a new path with larger interlayer spacing.However,the further study of pillared MXenes is blocked at multilayered state due to serious restacking phenomenon of few-layered MXene nanosheets.In this work,for the first time,we designed a facile NH4+method to fundamentally solve the restacking issues of MXene nanosheets and succeeded in achieving pillared few-layered MXene.Sn nanocomplex pillared few-layered Ti3C2Tx(STCT)composites were synthesized by introducing atomic Sn nanocomplex into interlayer of pillared few-layered Ti3C2Tx MXenes via pillaring technique.The MXene matrix can inhibit Sn nanocomplex particles agglomeration and serve as conductive network.Meanwhile,the Sn nanocomplex particles can further open the interlayer spacing of Ti3C2Tx during lithiation/delithiation processes and therefore generate extra capacity.Benefiting from the“pillar effect,”the STCT composites can maintain 1016 mAh g^?1 after 1200 cycles at 2000 mA g^?1 and deliver a stable capacity of 680 mAh g^?1 at 5 A g^?1,showing one of the best performances among MXene-based composites.This work will provide a new way for the development of pillared MXenes and their energy storage due to significant breakthrough from multilayered state to few-layered one. 展开更多
关键词 pillared MXene Few-layered MXene TIN nanocomplex LITHIUM-ION STORAGE
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Sorption of wastewater containing reactive red X-3B on inorgano-organo pillared bentonite 被引量:6
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作者 ZENG Xiu-qiong 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE CAS CSCD 2006年第4期314-319,共6页
Bentonite is a kind of natural clay with good exchanging ability. By exchanging its interlamellar cations with various soluble cations, such as quaternary ammonium cations and inorganic metal ions, the properties of n... Bentonite is a kind of natural clay with good exchanging ability. By exchanging its interlamellar cations with various soluble cations, such as quaternary ammonium cations and inorganic metal ions, the properties of natural bentonite can be greatly improved. In this study, hexadecyltrimethylammonium bromide (HDTMA), CaCl2, MgCl2, FeCl3, AlCl3 were used as organic and inorganic pillared materials respectively to produce several kinds of Ca-, Mg-, Fe-, Al-organo pillared bentonites. Sorption of reactive red X-3B on them was studied to determine their potential application as sorbents in wastewater treatment. The results showed that these pillared bentonites had much improved sorption properties, and that the dye solutions’ pH value had some effect on the performance of these inorgano-organo pillared bentonites. Isotherms of reactive X-3B on these pillared bentonites sug-gested a Langmuir-type sorption mechanism. 展开更多
关键词 Reactive red X-3B SORPTION pillared BENTONITE
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Study on structural characteristics of pillared clay modified phosphate fertilizers and its increase efficiency mechanism 被引量:6
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作者 吴平霄 廖宗文 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE EI CAS CSCD 2005年第3期195-201,共7页
Three types of new high-efficiency phosphate fertilizers were made when pillared clays at certain proportions were added into ground phosphate rock. Chemical analyses showed that their soluble phosphorus content decre... Three types of new high-efficiency phosphate fertilizers were made when pillared clays at certain proportions were added into ground phosphate rock. Chemical analyses showed that their soluble phosphorus content decreased more than that of superphosphate. Pot experiment showed that, under equal weights, the new fertilizers increased their efficiency by a large margin over that of superphosphate. Researches on their structures by means of XRD, IR and EPR spectrum revealed that their crystal structures changed considerably, improving their activity and preventing the fixation of available phosphorus in the soil, and consequently, greatly improved the bioavailability and became the main cause of the increase of biomass. 展开更多
关键词 High-efficiency phosphate fertilizers STRUCTURES pillared clay Pot experiment
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Adsorption of Environmental Pollutants on Pillared Montmorillonite 被引量:5
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作者 WUPINGXIAL GUOJIUGAO 《Pedosphere》 SCIE CAS CSCD 2001年第2期159-166,共8页
Both inorganic and organic pillared montmorillonites were used to adsorb phenol. Batch kinetics and isotherm studies were carried out to evaluate the effect of equilibrium time and pH on adsorption of phe- nol by mont... Both inorganic and organic pillared montmorillonites were used to adsorb phenol. Batch kinetics and isotherm studies were carried out to evaluate the effect of equilibrium time and pH on adsorption of phe- nol by montmorillonites and re-adsorbing characteristics of pillared montmorillonites. The adsorption of phenol increased with increasing solution pH values. The elimination ratio of phenol from the solution by the absorption of organic modified pillared montmorillonite (OrPMt) reached equilibrium quickly after vibrating for 5 minutes. Meanwhile for organic montmorillonite (OrMt), pillared montmorillonite (PMt) and montmorillonite (Mt), the time to reach phenol-absorption equilibrium were 20, 30 and 90 minutes, respectively. The adsorbing capacity of the pillared montmorillonite modified with surfactant improved greatly. The phenol-adsorbing capacity of pillared molltmorillonites mainly depended on microporous structure and surface component of the modified clays. After calcination at 500 ℃, the pillar structure and the basal spacing (1.83 um) were still stable. So the pillared montmorillonite could be recycled, and it was a potential material for adsorbing environmental pollutants. 展开更多
关键词 ADSORPTION PHENOL pillared montmorillonite
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POROUS MEMBRANE TEMPLATED SYNTHESIS OF POLYMER PILLARED LAYER 被引量:4
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作者 杨振忠 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2003年第3期381-384,共4页
The anodic porous alumina membranes with a definite pore diameter and aspect ratio were used as templates tosynthesize polymer pillared layer structures. The pillared polymer was produced in the template membrane pore... The anodic porous alumina membranes with a definite pore diameter and aspect ratio were used as templates tosynthesize polymer pillared layer structures. The pillared polymer was produced in the template membrane pores, and thelayer on the template surfaces. Rigid cured epoxy resin, polystyrene and soft hydrogel were chosen to confirm themethodology. The pillars were in the form of either tubes or fibers, which were controlled by the alumina membrane pore surface wettability. The structural features were confirmed by scanning electron microscopy results. 展开更多
关键词 Anodic porous alumina membranes Template synthesis pillared layer POLYMERS
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Mesoporous Silicoaluminum Pillared Clays with High Thermal Stability and BrФnsted/Lewis Acidity by One-pot Synthesis 被引量:3
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作者 ChunHuiZHOU XiaoNianLI DongShengTONG YiFenZHU ZhongHuaGE 《Chinese Chemical Letters》 SCIE CAS CSCD 2005年第2期261-264,共4页
Mesoporous silicoaluminum pillared clays have been synthesized by one-potgallery-templated synthesis using organomontmorillonite, tetraethyl orthosilicate and aluminaisopropoxide as precursor. According to the charact... Mesoporous silicoaluminum pillared clays have been synthesized by one-potgallery-templated synthesis using organomontmorillonite, tetraethyl orthosilicate and aluminaisopropoxide as precursor. According to the characterization by powder X-ray diffraction(PXRD), thermogravimetric analysis (TGA), N2 adsorption isotherms and pyridine adsorptioninfrared (IR) techniques, the synthetic silicoaluminum pillared clays possess regular porosity withhigh thermal stability up to 750 ℃ and Br?nsted /Lewis acidity. 展开更多
关键词 pillared clays mesoporous materials ACIDITY solid acid catalysts.
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Atomic insights into synergistic effect of pillared graphene by carbon nanotube on the mechanical properties of polymer nanocomposites 被引量:2
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作者 Zhipeng Zhou Hang Zhang +2 位作者 Jiali Qiu Pengwan Chen Weifu Sun 《Nano Materials Science》 EI CAS CSCD 2022年第3期235-243,共9页
Molecular dynamics simulations have been performed to explore the underlying synergistic mechanism of pillared graphene or non-covalent connected graphene and carbon nanotubes(CNTs) on the mechanical properties of pol... Molecular dynamics simulations have been performed to explore the underlying synergistic mechanism of pillared graphene or non-covalent connected graphene and carbon nanotubes(CNTs) on the mechanical properties of polyethylene(PE) nanocomposites. By constructing the pillared graphene model and CNTs/graphene model, the effect of the structure, arrangement and dispersion of hybrid fillers on the tensile mechanical properties of PE nanocomposites was studied. The results show that the pillared graphene/PE nanocomposites exhibit higher Young’s modulus, tensile strength and elongation at break than non-covalent connected CNTs/graphene/PE nanocomposites. The pull-out simulations show that pillared graphene by CNTs has both large interfacial load and long displacement due to the mixed modes of shear separation and normal separation. Additionally, pillared graphene can not only inhibit agglomeration but also form a compact effective thickness(stiff layer), consistent with the adsorption behavior and improved interfacial energy between pillared graphene and PE matrix. 展开更多
关键词 Molecular dynamics Carbon nanotube pillared graphene Synergistic effect Polymer nanocomposite
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Preparation and Microstructure of Al-pillared Interlayered Montmorillonite 被引量:2
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作者 曹明礼 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2002年第4期13-16,共4页
Al-pillared interlayered montmorillonite (Al-PILM) was prepared using the artificial Na-montmorillonite from the Qingfengshan bentonite mine as a starting material mixed with Al-pillaring solutions.The microstructure ... Al-pillared interlayered montmorillonite (Al-PILM) was prepared using the artificial Na-montmorillonite from the Qingfengshan bentonite mine as a starting material mixed with Al-pillaring solutions.The microstructure of the materials was studied by an X-ray powder diffractometer and a Fourier transform infrared (FTIR) spectrometer.The results indicated that the basal spacing [d(001) value] of the materials was increased significantly to 1.9194 nm relative to Na-montmorillonite (1.2182 nm).After calcined for 2 h at 300℃,the basal spacing was stabilized at 1.8394 nm and the layered structure of the materials was not destroyed.Thermal analysis was conducted by a thermal gravimetry and differential thermal analysis (TG-DTA) instrument,it showed that Al-PILM lost physically adsorbed water below 230.6℃ and water formed by dehydroxylation of the pillars at around 497.1℃, with a peak of the phase transformation at 903.0℃. 展开更多
关键词 Al-pillared interlayered montmorillonite pillaring solution PREPARATION MICROSTRUCTURE
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Synthesis and Characterization of Al-Cr-Pillared Montmorillonite with High Thermal Stability and Adsorption Capacity* 被引量:1
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作者 曹明礼 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2004年第1期51-53,共3页
Al-Cr-pillared montmorillonite was synthesized by using bentonite and Al-Cr pillaring solutions as starting materials.The basal spacing and specific surface areas of the materials were significantly increased relative... Al-Cr-pillared montmorillonite was synthesized by using bentonite and Al-Cr pillaring solutions as starting materials.The basal spacing and specific surface areas of the materials were significantly increased relative to those of untreated clays.When the Al/Cr molar ratio(R) was 0.10,the d(001) value and specific surface area of pillared montmorillonite were 1.9194 nm and 165.7 m2 g -1,respectively.Thermal stability of the materials was determined using calcined tests and X-ray diffraction (XRD) analysis.The materials formed at different R(0.05;0.10;0.15;0.25) exhibit a high thermal stability at 300℃,especially at initial R=0.10,the basal interlayer spacing of materials is stabilized at 1.7313 nm after calcined at 500℃ for 2 h.Adsorption behavior of the materials was studied by adsorption experiments.The results show that the Al-Cr-pillared montmorillonites exhibit much stronger adsorption capacity on Cr 6+ in aqueous solution than untreated clays do. 展开更多
关键词 Al-Cr-pillared montmorillonite pillaring solution SYNTHESIS CHARACTERIZATION ADSORPTION
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Synthesis and Photocatalytic Property of the ZrO_2/TiO_2 Pillared Laponite 被引量:1
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作者 林英光 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2011年第5期852-856,共5页
The ZrO2/TiO2 pillared laponite (Ti-Zr-lap) photocatalysts were prepared with intercalation reaction by supercritical fluid drying (SCFD),and characterized by XRD,TEM,SEM and BET surface area analysis,and the phot... The ZrO2/TiO2 pillared laponite (Ti-Zr-lap) photocatalysts were prepared with intercalation reaction by supercritical fluid drying (SCFD),and characterized by XRD,TEM,SEM and BET surface area analysis,and the photocatalytic properties of Ti-Zr-lap were investigated by degradation of azo dye acid red B (ARB).The results showed that the ZrO2/TiO2 pillared structures in laponite could be formed,with the mass fraction of (Zr4++Ti4+)/laponite (Xm) increasing,the basal spacing and the BET surface area of Ti-Zr-lap significantly increased.The Ti-Zr-lap used as photocatalyst had the advantages of stable and porous layered structure,large surface area with the anatase type TiO2.Compared with the Ti-Zr-lap dried by air drying,the Ti-Zr-lap dried by SCFD showed better photocatalytic property which was very close to that of P25 TiO2.Using the Ti-Zr-lap as photocatalyst with the optimum Xm of 0.16 and the calcination temperature of 500 ℃,under the conditions of the initial concentration of ARB 20 mg/L,photocatalyst concentration of 1.5 g/L and irradiation time 60 min,the decoloring rate of ARB could achieve 98.3%,indicating that the Ti-Zr-lap had excellent photocatalytic property. 展开更多
关键词 ZrO2/TiO2 pillared laponite photocatalytic property intercalation reaction supercritical fluid drying
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Synthesis of Magnetically Modified Fe-Al Pillared Bentonite and Heterogeneous Fenton-like Degradation of Orange II 被引量:2
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作者 陈坤 WANG Guanghua +5 位作者 李文兵 WAN Dong HU Qin LU Lulu WEI Xiaobi CHENG Zhengzai 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第2期302-306,共5页
Magnetically modified Fe-Al pillared bentonite(Fe3O4/ Fe-Al-Bent) was prepared via chemical co-precipitation method and characterized by powder X-ray diffraction(XRD), Brunauer-EmmettTeller(BET), Fourier transfo... Magnetically modified Fe-Al pillared bentonite(Fe3O4/ Fe-Al-Bent) was prepared via chemical co-precipitation method and characterized by powder X-ray diffraction(XRD), Brunauer-EmmettTeller(BET), Fourier transform infrared spectroscopy(FTIR) and scanning electron microscopy(SEM). A series of experiments were carried out to investigate the degradation of Orange II by the obtained heterogeneous catalysts in the presence of H2O2. The experimental result indicated that the synthetic materials had a high catalytic activity and good reusability. 展开更多
关键词 Fe3O4 nanoparticles pillared bentonite heterogeneous Fenton-like Orange II
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Effects of Layer Change and Chemical Composition on Thermal Stability and Catalytic Activity of Pillared Montmorillonite
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作者 Liao Huisheng , He Mingyuan (Research Institute of Petroleum Processing, Beijing 100083) 《石油学报(石油加工)》 EI CAS CSCD 北大核心 1997年第S1期97-101,共5页
EfectsofLayerChangeandChemicalCompositiononThermalStabilityandCatalyticActivityofPilaredMontmoriloniteLiaoHu... EfectsofLayerChangeandChemicalCompositiononThermalStabilityandCatalyticActivityofPilaredMontmoriloniteLiaoHuisheng,HeMingyuan... 展开更多
关键词 pillared MONTMORILLONITE LAYER structure cation exchange capacity THERMAL STABILITY CATALYTIC property hydrocracking reaction
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Synthesis,Characterization and Catalysis of New Pillared Anionic Clays by[GaW_(11)O_(39)M(H_(2)O)]^(7-)(M=Mn^(2+),Co^(2+)or Ni^(2+))
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《Chemical Research in Chinese Universities》 SCIE CAS CSCD 1998年第3期32-36,共5页
Pillared anionic clays or layered double hydroxides were prepared by means of hydrothermal ion exchange reaction of [Zn 2Al(OH) 6]NO 3· x H 2O (ZnAl NO 3) with [GaW 11 O 39 M(H 2O)] 7- (abbr... Pillared anionic clays or layered double hydroxides were prepared by means of hydrothermal ion exchange reaction of [Zn 2Al(OH) 6]NO 3· x H 2O (ZnAl NO 3) with [GaW 11 O 39 M(H 2O)] 7- (abbreviated as GaW 11 M, M=Mn 2+ , Co +2 or Ni 2+ ). The layered compounds were characterized by means of XRD, IR, elemental analysis and DTA. The X ray diffraction and IR spectra show that the new anionic clays synthesized are layered compounds with the gallery heights of 0.99-1.00 nm and the Keggin structure tungstogallic heteropolyanions almost completely replace the interlayer NO - 3, entering the layer and retain their Keggin structure. The DTA gives a thermostability order of ZnAl GaW 11 Ni >ZnAl GaW 11 Co>ZnAl GaW 11 Mn>ZnAl NO 3. The ctalytic tests showed that the new pillared compounds have higher catalytic activities in the cyclooxidation reaction of maleic acid. 展开更多
关键词 HETEROPOLYANION INTERCALATION pillared clay EPOXIDATION
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One Pillared Layered Zn(Ⅱ) Coordination Compound Based on 2,6-Naphthalenedicarboxylic Acid: Synthesis, Structure and Luminescent Property
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作者 LI Ya-Min WU Ying-Ying +3 位作者 LI Hai-Yan ZHAO Xiao-Wei JIN Lin-Yu DANG Dong-Bin 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2019年第5期761-768,669,共9页
One new pillared layered zinc hydroxide {Zn4(OH)6(ndc)·2(H2 O)}n,(H2 ndc =2,6-na-phthalenedicarboxylic acid) has been achieved under hydrothermal conditions by using2,6-na-phthalenedicarboxylic acid, 2,4-... One new pillared layered zinc hydroxide {Zn4(OH)6(ndc)·2(H2 O)}n,(H2 ndc =2,6-na-phthalenedicarboxylic acid) has been achieved under hydrothermal conditions by using2,6-na-phthalenedicarboxylic acid, 2,4-diami-6-phenyl-1,3,5-triazine as well as Zn(OAc)2·2 H2 O,and structurally characterized by X-ray single-crystal diffraction, IR spectra, elemental analysis,powder X-ray diffraction(PXRD) and thermogravimetric analysis(TGA). The X-ray single-crystal diffraction proves that the title compound is in monoclinic system, space group P21/c with a =16.362(8), b = 9.324(5), c = 5.364(3) ?, β = 99.081(9)°, V = 808.1(7) ?3, Dc = 2.522 g/cm3, Mr =613.73, Z = 2, F(000) = 608, μ = 5.935 mm-1, GOOF = 1.050, R = 0.0469 and wR(Ⅰ > 2σ(Ⅰ)) =0.1291. In the title compound, the tetrahedral and octahedral zinc atoms are connected by μ3-OH groups to form zinc hydroxide inorganic layers extending parallel to the bc-plane. The adjacent layers are pillared by the connection of Zn2 atoms with ndc2-ligands to construct a three-dimensional(3D) structure; meanwhile, the interactions of five hydrogen bonds make the 3D network structure more stable. Furthermore, the title compound exhibits luminescent property at solid state. 展开更多
关键词 pillared layer zinc HYDROXIDE naphthalenedicarboxylic acid LUMINESCENT property
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Single crystal metal-organic framework constructed by vertically self-pillared nanosheets and its derivative for oriented lithium plating
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作者 Xiaomin Jia Shaowen Li +12 位作者 Tu Sun Yanzhi Wang Yaqi Fan Chaochao Zhang Yang Xu Zuozhong Liang Haitao Lei Wei Zhang Yuye Zhou Yanhang Ma Haoquan Zheng Yue Ma Rui Cao 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第9期1553-1560,共8页
This vertically self‐pillared(VSP)structure extends the application range of traditional porous materials with facile mass/ion transport and enhanced reaction kinetics.Here,we prepare a single crystal metal‐organic ... This vertically self‐pillared(VSP)structure extends the application range of traditional porous materials with facile mass/ion transport and enhanced reaction kinetics.Here,we prepare a single crystal metal‐organic framework(MOF),employing the ZIF‐67 structure as a proof of concept,which is constructed by vertically self‐pillared nanosheets(VSP‐MOF).We further converted VSP‐MOF into VSP‐cobalt sulfide(VSP‐CoS2)through a sulfidation process.Catalysis plays an important role in almost all battery technologies;for metallic batteries,lithium anodes exhibit a high theoretical specific capacity,low density,and low redox potential.However,during the half‐cell reaction(Li++e=Li),uncontrolled dendritic Li penetrates the separator and solid electrolyte interphase layer.When employed as a composite scaffold for lithium metal deposition,there are many advantage to using this framework:1)the VSP‐CoS2 substrate provides a high specific surface area to dissipate the ion flux and mass transfer and acts as a pre‐catalyst,2)the catalytic Co center favors the charge transfer process and preferentially binds the Li+with the enhanced electrical fields,and 3)the VSP structure guides the metallic propagation along the nanosheet 2D orientation without the protrusive dendrites.All these features enable the VSP structure in metallic batteries with encouraging performances. 展开更多
关键词 Vertically self‐pillared structure Metal organic framework Pre‐catalyst preparation Lithium plating orientation Metallic battery
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Preparation and Properties of Pillared Montmorillonite by Polyhydroxyl-aluminum-manganese Cations
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作者 曹明礼 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2002年第2期43-46,共4页
Al-Mn-pillared montmorillonite(AMPM) was prepared by using the artificial Na-montmoril-lonite from the Qingfengshan bentonite mine as starting materials mixed with Al-Mn pillaring solutions at different Al/Mn molar ra... Al-Mn-pillared montmorillonite(AMPM) was prepared by using the artificial Na-montmoril-lonite from the Qingfengshan bentonite mine as starting materials mixed with Al-Mn pillaring solutions at different Al/Mn molar ratios (R). The basal spacing and specific surface area of the materials were increased significantly compared with untreated clays. When R = 0.5, the d (001) value and specific surface area of pillared montmoril-lonite were 1.8987 ran and 146.01 m2 g-1, respectively. The thermal stability was determined using calcined tests , X-ray diffraction ( XRD ) analysis, thermal gravimetry and differential thermal analysis (TG - DTA). The materials formed at initial R = 0.5 exhibited a high stability, the basal interlayer spacing was stabilized at 1.7859 nm after calcined for 2 h at 300℃. The adsorption behavior of the materials was studied by adsorption experiments. The results show the AMPM and calcined Al-Mn-pillared montmorillonite ( CAMPM) exhibit a strong capacity of adsorbing the Zn(Ⅱ) in aqueous solution at pH 10.0. 展开更多
关键词 Al-Mn-pillared montmorillonite pillaring solution pofyhydroxyl-aluminum-manganese cations preparation properties
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Note:Molecular simulation of the adsorption of linear alkane mixtures in pillared layered materials
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作者 LI Wen-zhuo CHE Yu-liang +1 位作者 LIU Zi-yang ZHANG Dan 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2007年第2期331-334,共4页
The adsorption isotherms of mixtures of linear alkanes, involving n-pentane, n-hexane, and n-heptane in pillared layered materials (PLMs) with three different porosities Ψ=0.98, 0.94 and 0.87, and three pore widths H... The adsorption isotherms of mixtures of linear alkanes, involving n-pentane, n-hexane, and n-heptane in pillared layered materials (PLMs) with three different porosities Ψ=0.98, 0.94 and 0.87, and three pore widths H=1.02, 1.70 and 2.38 nm at temperature T=300 K were simulated by using configurational-bias Monte Carlo (CBMC) techniques in grand canonical ensemble.A grid model was employed to calculate the interaction between a fluid molecule and two layered boards here. For alkane mixtures,the n-heptane, the longest chain component in alkane mixtures, is preferentially adsorbed at low pressures, with its adsorption increasing and then decreasing as the pressure increases continuously while the n-pentane, the shortest chain component in alkane mixtures, is still adsorbed at high pressures; the adsorption of the longest chain component of alkane mixtures increases as the pore width and the porosity of PLMs increase. 展开更多
关键词 Molecular simulation Alkane mixtures pillared layered materials (PLMs)
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Visible light induced TiO_2 pillared MMT photocatalyst coupling-doped with S and N
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作者 周安宁 陈有梅 于占江 《Journal of Coal Science & Engineering(China)》 2008年第3期517-519,共3页
Visible light induced titanium dioxide (TiO2) pillared montmorillonite clay (MMT) photocatalyst coupling-doped with S and N elements was prepared by the two-step ad- sorption method.The photocatalyst was characterized... Visible light induced titanium dioxide (TiO2) pillared montmorillonite clay (MMT) photocatalyst coupling-doped with S and N elements was prepared by the two-step ad- sorption method.The photocatalyst was characterized by X-ray photoelectron spectros- copy (XPS) and ultraviolet-visible (UV-vis) absorption spectroscopy.The photocatalysic ef- ficacy of the prepared photocatalyst for degrading gaseous formaldehyde was evaluated under visible light irradiation.The degrading rate of gaseous formaldehyde is nearly 85% in 300 min visible light irradiation.The results demonstrate that the much higher visible light photocatalytic activity of the photocatalyst is due to the synergistic effects of coupling- doping of S and N elements to TiO2,extensive specific surface area of MMT and quantum sized efficacy between layers of MMT. 展开更多
关键词 visible light pillared MMT PHOTOCATALYST coupling-doping gaseous formaldehyde
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Characterization and Adsorption Study of Thymol on Pillared Bentonite
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作者 Mohamed El Miz Samira Salhi +3 位作者 Ikrame Chraibi Ali El Bachiri Marie-Laure Fauconnier Abdesselam Tahani 《Open Journal of Physical Chemistry》 2014年第3期98-116,共19页
Pillared clay (PILC) was prepared from Moroccan clay and characterized, and its aqueous thymol adsorption capacities were studied using a batch equilibrium technique. So, we tested the encapsulation of thymol by alumi... Pillared clay (PILC) was prepared from Moroccan clay and characterized, and its aqueous thymol adsorption capacities were studied using a batch equilibrium technique. So, we tested the encapsulation of thymol by aluminum pillared clay (PILC). The PILCs displayed a total surface area of 270 m2/g, a total pore volume of 0.246 cm3/g and an average pore diameter of 8.9 A, which corresponds to the size of Al13 forming the pillars between the clay layers. The adsorption capacity shown by the PILCs for thymol from water is close to 319 mg?g-1 for low solid/liquid ratio (0.2%). This result suggests that the PILCs have both hydrophobic and hydrophilic characteristics, as a result of the presence of silanol and siloxane groups formed during the pillaring and calcination of the PILCs. The experimental data were analyzed by the Freundlich and the Langmuir isotherm types for low values of equilibrium concentration. The rise of the isotherm in this range of concentrations was related to the affinity of thymol for clay sites, and the equilibrium data fitted well with the Freundlich model with maximum adsorption capacity of 319.51 mg/g for a ratio RS/L = 0.2%. Pseudo-first and pseudo-second-order kinetic models were tested with the experimental data and pseudo-first order kinetics was the best for the adsorption of thymol with coefficients of correlation R2 ≥0.986, and the adsorption was rapid with 90% of the thymol adsorbed within the first 20 min. 展开更多
关键词 Clays BENTONITE THYMOL ADSORPTION DESORPTION Kinetics pillared CLAY
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