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Atomic-level insight of sulfidation-engineered Aurivillius-related Bi_(2)O_(2)SiO_(3) nanosheets enabling visible light low-concentration CO_(2) conversion 被引量:9
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作者 Kai Wang Yue Du +6 位作者 Yuan Li Xiaoyong Wu Haiyan Hu Guohong Wang Yao Xiao Shulei Chou Gaoke Zhang 《Carbon Energy》 SCIE CSCD 2023年第2期1-11,共11页
Unraveling atomic-level active sites of layered photocatalyst towards lowconcentration CO_(2) conversion is still challenging.Herein,the yield and selectivity of photocatalytic CO_(2) reduction of the Aurivillius-rela... Unraveling atomic-level active sites of layered photocatalyst towards lowconcentration CO_(2) conversion is still challenging.Herein,the yield and selectivity of photocatalytic CO_(2) reduction of the Aurivillius-related oxide semiconductor Bi_(2)O_(2)SiO_(3) nanosheet(BOSO)were largely improved using a surface sulfidation strategy.The experiment and theoretical calculation confirmed that surface sulfidation of the Bi_(2)O_(2)SiO_(3) nanosheet(S-BOSO,6.28 nm)redistributed the charge-enriched Bi sites,extended the solar spectrum absorption to the whole visible range,and considerably enhanced the charge separation,in addition to creating new reaction active sites,as compared to pristine BOSO.Subsequently,surface sulfidation played a switchable role,wherein S-BOSO showed a very high CH_(3)OH generation rate(12.78μmol g^(-1) for 4 h,78.6%selectivity)from low-concentration CO_(2)(1000 ppm)under visible light irradiation,which outperforms most of the state-of-the-art photocatalysts under similar conditions.This study presents an atomic-level modification protocol for engineering reactive sites and charge behaviors to promote solar-to-energy conversion. 展开更多
关键词 [Bi_(2)O_(2)]^(2)+layer Bi_(2)O_(2)SiO_(3) low-concentration CO_(2)reduction photocatalysis SULFIDATION
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Rheology and influence factor of low-concentration Konjac gum solutions 被引量:2
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作者 王元兰 李忠海 魏玉 《Journal of Central South University》 SCIE EI CAS 2008年第S1期516-519,共4页
Rheological properties of low-concentration Konjac gum and impacts of concentration,shearing rate,pH value and stirring time on its viscosity were studied.The results show that the viscosity of low-concentration Konja... Rheological properties of low-concentration Konjac gum and impacts of concentration,shearing rate,pH value and stirring time on its viscosity were studied.The results show that the viscosity of low-concentration Konjac gum increases with the increase of its concentration.The solution presents pseudo-plasticity fluid,which shows the characters of shear thinning as follows:first,its viscosity decreases gradually as the temperature increases,and then increases with the increase of temperature.The viscosity decreases sharply at both acid and alkaline conditions,indicating that it is influenced apparently by pH value.And the viscosity of low-concentration Konjac gum is also impacted by the stirring time. 展开更多
关键词 KONJAC gum low-concentration RHEOLOGY VISCOSITY
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Neuroprotective effects of low-concentration alpha-tocopherol Confocal laser microscopy observations
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作者 Weilun Liang Huiling Huang +4 位作者 Qiaoli Wu Chen Wang Wenzhi Zhang Xin Su Dashi Zhi 《Neural Regeneration Research》 SCIE CAS CSCD 2009年第2期135-138,共4页
BACKGROUND: Alpha-tocopherol ( α-tocopherol) can effectively relieve neuronal damage induced by oxygen-centered free radicals. However, the effective dose remains controversial. OBJECTIVE: To evaluate the protect... BACKGROUND: Alpha-tocopherol ( α-tocopherol) can effectively relieve neuronal damage induced by oxygen-centered free radicals. However, the effective dose remains controversial. OBJECTIVE: To evaluate the protective effects of low-concentration α-tocopherol on neuronal membranes. DESIGN, TIME AND SETTING: Contrast observation and in vitro study, performed at Laboratory of Neurosurgery, Tianjin Huanhu Hospital between April and September 2006. MATERIALS: Fetal cortical neurons were derived from two 14-day pregnant SD rats, and α-tocopherol was provided by Sigma, USA. METHODS: The neurons were randomly assigned to six groups: (1) normal: neurons were cultured under normal conditions; (2) oxidative damage: oxidative free radicals was damaged using the Fenton reaction; (3) α-tocopherol: neurons were cultured in different concentrations of -tocopherol 10, 20, 40, and 80 mg/L for 2 hours, respectively. MAIN OUTCOME MEASURES: Neuronal membrane damage was observed using a confocal laser microscope, and malonaldehyde production was detected using the thiobarbituric acid method. RESULTS: At normal, biological concentrations (10 mg/L), α-tocopherol induced no change in the damaged neurons (P 〉 0.05). However, at a concentration of 80 mg/L, the number of damaged neurons was significantly reduced, compared with the damage group (P 〈 0.05). Malonaldehyde levels following 80 mg/L α-tocopherol treatment were less than the oxygen free radical damage group (P 〈 0.05), but greater than the control group (P 〈 0.01). CONCLUSION: A concentration of 80 mg/L α-tocopherol can effectively protect the neuronal cell membrane from oxidative damage 展开更多
关键词 Α-TOCOPHEROL confocal laser microscopy cell membrane low-concentration
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Study on Treatment Technology of Methanol in the Low-concentration Methanol-containing Wastewater of a Gas Field
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作者 Ren Xiaorong 《Meteorological and Environmental Research》 CAS 2018年第6期49-52,61,共5页
The low-concentration methanol-containing wastewater of a gas field mainly consists of the dehydrated water from natural gas,the water at the bottom of a rectifying tower,and the water used to clear tanks and pipes. T... The low-concentration methanol-containing wastewater of a gas field mainly consists of the dehydrated water from natural gas,the water at the bottom of a rectifying tower,and the water used to clear tanks and pipes. The concentration of methanol as its characteristic component is mostly lower than 3%. Its production and water quality change seasonally. It is mainly produced in late autumn,winter,and early spring when temperature is low. In the low-concentration methanol-containing wastewater,the content of organic matter,suspended solids and salts and COD value are high,and it is acidic. According to the physical and chemical properties of methanol such as easily dissolving in water,dissolving in most organic solvents,and having strong molecular polarity,laboratory experiments were made to study the difficulties of using high-temperature rectification,biodegradation,membrane filtration and organic oxidation technology to treat low-concentration methanol in the wastewater as well as the feasibility of industrial application. Ultraviolet catalytic oxidation technology has the advantages of high treatment efficiency,no secondary pollution,and no addition of treatment agent. After the low-concentration methanol-containing wastewater was treated by ultraviolet catalytic oxidation for 90 min,methanol concentration in the wastewater reduced from about 3% to around 0. 1%,thereby rapidly and efficiently degrading methanol in the wastewater. Based on the experimental parameters,a pilot device of ultraviolet catalytic oxidation was developed and used in the continuous treatment of the wastewater. When the flow rate of inflow was 500 L/h,the intensity of UV light was 2 k W,and hydraulic retention time was 60 min,methanol could be removed completely from the wastewater with the methanol concentration of about 0. 3%. This study provides a method for the treatment of low-concentration methanol-containing wastewater of a gas field,and also provides an experimental basis for the efficient degradation of organic wastewater. 展开更多
关键词 low-concentration methanol-containing wastewater METHANOL Organic wastewater Wastewater treatment
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Pilot-test about Treatment of Low-concentration Organic Waste Gas Using a Fixed Biological Bed
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作者 Wei Zhang Xu Zhang +2 位作者 Jun Ma Yajuan Zhu Zhuo Huang 《Meteorological and Environmental Research》 CAS 2013年第4期53-55,共3页
[ Objective] The study aims to discuss the feasibility of using a fixed biological bed to treat low-concentration organic waste gas. [ Method] A fixed biological bed was used to treat low-concentration organic waste g... [ Objective] The study aims to discuss the feasibility of using a fixed biological bed to treat low-concentration organic waste gas. [ Method] A fixed biological bed was used to treat low-concentration organic waste gas from a phosphate workshop, and then the waste gas treated was assessed by human sense of smell to determine the most economical empty bed contact time, thereby verifying the feasibility of using a fixed biolog- ical bed to treat low-concentration organic waste gas. [Result] When empty bed contact time was 60 s, the smell of the treated waste gas was acceptable, and COD value of recycled water in the fixed biological bed was essentially unchanged. It proved that organic load of the waste gas was consumed by microorganisms within 60 s. [ Conclusion] It is feasible to use a fixed biological bed to treat Iow-concantration organic waste gas from a phosphate workshop. 展开更多
关键词 Fixed biological bed low-concentration organic waste gas Pilot-test China
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Surface morphology and electrochemical behaviour of Ti-48Al-2Cr-2Nb alloy in low-concentration salt solution 被引量:4
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作者 WANG YuDi XU ZhengYang +2 位作者 ZHANG An XU GuangChao ZHANG ChenXiang 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2021年第2期283-296,共14页
Electrochemical machining(ECM) is becoming increasingly important for the efficient machining of parts with a large machining area. This is an addition challenge for ECM because of the very high machining current. To ... Electrochemical machining(ECM) is becoming increasingly important for the efficient machining of parts with a large machining area. This is an addition challenge for ECM because of the very high machining current. To overcome this difficulty, a direct and effective strategy is to adopt the machining mode that uses a low-concentration electrolyte with a low current density.The purpose of this study is to reveal the electrochemical behaviour and surface morphology in low-concentration electrolyte.The polarization behavior of Ti-48Al-2Cr-2Nb is measured by linear sweep voltammetry and cyclic voltammetry curves. The ηω-j curves demonstrate the special dissolution behaviour of Ti-48Al-2Cr-2Nb at low current densities. The surface morphology,surface quality, and dissolution mechanism are analysed in three low-concentration electrolytes at different current densities after the ECM dissolution experiments. The results demonstrate that Ti-48Al-2Cr-2Nb exhibits three unique dissolution morphologies in the three solutions, and we found that the γ-TiAl phase dissolves faster than the α2-Ti3Al phase. These results also show that 1% NaCl solution is more suitable for Ti-48Al-2Cr-2Nb in ECM compared with the other two solutions, considering its good surface quality, low breakdown potential, and high material removal rate. Later, the dissolution process of the sample in 1% NaCl solution at different corrosion times is revealed. Moreover, a dissolution model is proposed for the electrochemical dissolution behaviour of Ti-48Al-2Cr-2Nb in 1% NaCl solution. 展开更多
关键词 electrochemical machining γ-TiAl alloy low-concentration salt solution surface morphology electrochemical behaviour
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High performance organic transistors and phototransistors based on diketopyrrolopyrrole-quaterthiophene copolymer thin films fabricated via low-concentration solution processing 被引量:4
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作者 Pengcheng Gu Mengxiao Hu +7 位作者 Shang Ding Guangyao Zhao Yifan Yao Feng Liu Xiaotao Zhang Huanli Dong Xiangke Wang Wenping Hu 《Chinese Chemical Letters》 SCIE CAS CSCD 2018年第11期1675-1680,共6页
Conjugated polymers have received considerable attentions over the past years due to their large-area potential applications via low-cost solution processing. Improving crystallinity of conjugated polymer molecules in... Conjugated polymers have received considerable attentions over the past years due to their large-area potential applications via low-cost solution processing. Improving crystallinity of conjugated polymer molecules in solution-processed thin films is crucial for their efficient charge transport and thus high performance optoelectronic devices. Herein, with diketopyrrolopyrrole-quaterthiophene (PDQT) copo/ymer as an example, it is found that by simply reducing the solution concentration for spincoating meanwhile with the assistance of post-annealing, significantly enhanced film crystallinity with formation of typical single crystalline domains is obtained, which benefits from the enough space for better molecular assembly especially at the semiconductor/dielectric interface. High performance polymer transistors and phototransistors were finally constructed based on the optimal lowconcentration (2 mg/mL) spin-coated PDQT films (~12 nm), which giving a high charge carrier mobility of 2.28 cm2 V-1 s-1 and a photoresponse on/off ratio of 2.1 ×107 at VG = 0 V under white light irradiation of 6mW/cm2. The results suggest that the bright future of PDQT crystalline films for large-area flexible integrated optoelectronic devices and the application of effective low-concentration processing approach in solution-processed organic electronics with reduced material waste. 展开更多
关键词 Conjugated polymer Thin film low-concentration processing CRYSTALLINITY Molecular orders MOBILITY Optoelectronic property
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Extraction mechanism and separation behaviors of low-concentration Nd^(3+) and Al^(3+) in P507-H_(2)SO_(4) system 被引量:3
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作者 Hongyuan Zhang Longsheng Zhao +4 位作者 Xudong Zheng Depeng Liu Zongyu Feng Yongqi Zhang Xiaowei Huang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2022年第6期952-957,I0004,共7页
In order to clarify the solvent extraction and separation behaviors of rare earths and impurity of Al during the extraction and enrichment of low-concentration leach solution of ion-adsorption rare earth ore,the extra... In order to clarify the solvent extraction and separation behaviors of rare earths and impurity of Al during the extraction and enrichment of low-concentration leach solution of ion-adsorption rare earth ore,the extraction mechanism and separation behaviors of Nd^(3+)and Al^(3+)in the Nd_(2)(SO_(4))_(3)-AI_(2)(SO_(4))_(3) mixed solution using P507 were studied in this work.The extraction of Nd^(3+)and Al^(3+)follows the cation exchange mechanism.With the increase of the equilibrium pH,β_(Nd/Al) in the extraction of the Nd_(2)(SO_(4))_(3)-Al_(2)(SO_(4))_(3) mixed solution using P507 is always higher than that in the extraction of single Nd_(2)(SO_(4))_(3) and Al_(2)(SO_(4))_(3) solutions.It can be attributed to the fact that the extraction of Nd^(3+)using P507 is much faster than that of Al^(3+),and Al^(3+)is more prone to be hydrolyzed at lower pH.β_(Nd/Al) in the extraction of the Nd_(2)(SO_(4))_(3)-Al_(2)(SO_(4))_(3) mixed solution decreases gradually with the increase of mixing time within the equilibrium pH range of 1.5-1.9.The extraction of Nd^(3+)using P507 is much faster than that of Al^(3+),but the stability of Al^(3+)-Ioaded organic phase is better than that of Nd^(3+)-loaded organic phase,thus Nd^(3+)in the Nd^(3+)-loaded organic phase is gradually replaced by Al^(3+)in the aqueous phase with the increase of mixing time. 展开更多
关键词 Ion-adsorption rare earth ore low-concentration rare earth Aluminum Extraction mechanism Separation factor
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Contaminant removal from low-concentration polluted river water by the bio-rack wetlands 被引量:4
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作者 Ji Wang Lanying Zhang +2 位作者 Shaoyong Lu Xiangcan Jint Shu Gan 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2012年第6期1006-1013,共8页
The bio-rack is a new approach for treating low-concentration polluted river water in wetland systems.A comparative study of the efficiency of contaminant removal between four plant species in bio-rack wetlands and be... The bio-rack is a new approach for treating low-concentration polluted river water in wetland systems.A comparative study of the efficiency of contaminant removal between four plant species in bio-rack wetlands and between a bio-rack system and control system was conducted on a small-scale (500 mm length × 400 mm width × 400 mm height) to evaluate the decontamination effects of four different wetland plants.There was generally a significant difference in the removal of total nitrogen (TN),ammonia nitrogen (NH 3-N) and total phosphorus (TP),but no significant difference in the removal of permanganate index (COD Mn) between the bio-rack wetland and control system.Bio-rack wetland planted with Thalia dealbata had higher nutrient removal rates than wetlands planted with other species.Plant fine-root (root diameter 3 mm) biomass rather than total plant biomass was related to nutrient removal efficiency.The study suggested that the nutrient removal rates are influenced by plant species,and high fine-root biomass is an important factor in selecting highly effective wetland plants for a bio-rack system.According to the mass balance,the TN and TP removal were in the range of 61.03-73.27 g/m^2 and 4.14-5.20 g/m^2 in four bio-rack wetlands during the whole operational period.The N and P removal by plant uptake constituted 34.9%-43.81% of the mass N removal and 62.05%-74.81% of the mass P removal.The study showed that the nitrification/denitrification process and plant uptake process are major removal pathways for TN,while plant uptake is an effective removal pathway for TP. 展开更多
关键词 bio-rack constructed wetland fine-root biomass low-concentration polluted river water plants uptake
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Catalytic reduction of low-concentration CO_2 with water by Pt/Co@NC
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作者 Qianqian Wang Wenzhong Wang +3 位作者 Ling Zhang Yang Su Kefu Wang Huixia Wu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2018年第12期2337-2341,共5页
The reduction of low-concentration carbon dioxide with water to organic fuels is still a huge challenge. In this study, we successfully designed the partially oxidized cobalt nanoparticles coated by the nitrogendoped ... The reduction of low-concentration carbon dioxide with water to organic fuels is still a huge challenge. In this study, we successfully designed the partially oxidized cobalt nanoparticles coated by the nitrogendoped carbon layer(Co@NC) of 2-8 nm via a facile method and then interspersed with different amount of Pt nanoparticles. The Co@NC decorated with 1 wt% Pt exhibits the best ability for COreduction to CHand a CHproduction rate of 14.4 μmol·g·his achieved. It is worth noting that the system is carried out under low-concentration CO(400 ppm) circumstance without any sacrificial agent, which could be meaningful to the design of catalysts for atmospheric COreduction. 展开更多
关键词 Carbon dioxide catalytic reduction Pt/Co@NC low-concentration CO_2 No sacrificial agent
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Detection of low-concentration EGFR with a highly sensitive optofluidic resonator
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作者 Jianfeng Shang Hailang Dai +1 位作者 Yun Zou Xianfeng Chen 《Chinese Optics Letters》 SCIE EI CAS CSCD 2017年第9期90-93,共4页
A hollow-core metal-cladding waveguide(HCMW) optofluidic resonator that works based on a free-space coupling technique is designed. An HCMW can excite ultra-high-order modes(UOMs) at the coupled angle, which can b... A hollow-core metal-cladding waveguide(HCMW) optofluidic resonator that works based on a free-space coupling technique is designed. An HCMW can excite ultra-high-order modes(UOMs) at the coupled angle, which can be used as an optofluidic resonator to detect alterations of the epidermal growth factor receptor(EGFR)concentration. Theoretical analysis shows that the UOMs excited in the HCMW have a highly sensitive response to the refractive index(RI) variation of the guiding layer. An EGFR solution with a 0.2 ng/mL alteration is detected, and the RI variation caused by the concentration alteration is about 2.5 × 10^(-3). 展开更多
关键词 Detection of low-concentration EGFR with a highly sensitive optofluidic resonator
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An aqueous magnesium-ion hybrid supercapacitor operated at-50℃
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作者 Guoshen Yang Gangrui Qu +7 位作者 Chi Fang Jie Deng Xianqi Xu Yinghao Xie Tian Sun Yachao Zhu Jiaxin Zheng Hang Zhou 《Green Energy & Environment》 SCIE EI CAS CSCD 2024年第4期702-712,共11页
The recent advances in aqueous magnesium-ion hybrid supercapacitor(MHSC)have attracted great attention as it brings together the benefits of high energy density,high power density,and synchronously addresses cost and ... The recent advances in aqueous magnesium-ion hybrid supercapacitor(MHSC)have attracted great attention as it brings together the benefits of high energy density,high power density,and synchronously addresses cost and safety issues.However,the freeze of aqueous electrolytes discourages aqueous MHSC from operating at low-temperature conditions.Here,a low-concentration aqueous solution of 4 mol L^(-1) Mg(ClO_(4))_(2) is devised for its low freezing point(-67℃)and ultra-high ionic conductivity(3.37 mS cm^(-1) at-50℃).Both physical characterizations and computational simulations revealed that the Mg(ClO_(4))_(2) can effectively disrupt the original hydrogen bond network among water molecules via transmuting the electrolyte structure,thus yielding a low freezing point.Thus,the Mg(ClO_(4))_(2) electrolytes endue aqueous MHSC with a wider temperature operation range(-50℃–25℃)and a higher energy density of 103.9 Wh kg^(-1) at 3.68 kW kg^(-1) over commonly used magnesium salts(i.e.,MgSO_(4) and Mg(NO_(3))_(2))electrolytes.Furthermore,a quasi-solid-state MHSC based on polyacrylamide-based hydrogel electrolyte holds superior low-temperature performance,excellentflexibility,and high safety.This work pioneers a convenient,cheap,and eco-friendly tactic to procure low-temperature aqueous magnesium-ion energy storage device. 展开更多
关键词 low-concentration aqueous electrolyte Anti-freezing property Magnesium-ion hybrid supercapacitor High energy density
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Effects of Different Grinding Methods on the Quality of Soybean Bean Milk
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作者 Miao XIAO Xuejiao ZHANG +3 位作者 Muwen LIU Xiao LI Tao YE Xiaoping YANG 《Agricultural Biotechnology》 2024年第2期20-24,共5页
[Objectives] This study was conducted to improve the nutritional value of soybean milk, enrich the variety and taste of soybean milk, and find healthy food that is more conducive to people s nutritional needs. [Method... [Objectives] This study was conducted to improve the nutritional value of soybean milk, enrich the variety and taste of soybean milk, and find healthy food that is more conducive to people s nutritional needs. [Methods] Whole soybean milk was prepared by grinding with a grinding wheel at a low concentration (low-concentration grinding) and a stainless steel mill at a high concentration (high-concentration grinding). The sensory, physical and chemical characteristics and anti-nutritional factors of whole soybean milk produced by different grinding methods were studied. [Results] Compared with low-concentration grinding, the protein content in soybean milk prepared by high-concentration grinding increased by 24%, and the dietary fiber content increased by 74.7%. Before and after high-pressure homogenization, the particle size D(4, 3) of soybean milk prepared by low-concentration grinding was 212.1 and 93.59 μm, respectively, and the particle size D(4, 3) of soybean milk prepared by high-concentration grinding was 134.0 and 64.64 μm, respectively. The trypsin inhibitor activity and phytic acid content of soybean milk prepared by high-concentration grinding were significantly lower than those of soybean milk prepared by low-concentration grinding. [Conclusions] This study improves the diet structure of the broad masses of people, strengthens people s physique, and provides a new idea for the implementation and development of China s "Soybean Action Programme". 展开更多
关键词 Whole soybean milk Grinding method low-concentration grinding High-concentration grinding Antinutritional factor
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Adsorptive removal of tetracycline from water using Fe(Ⅲ)-functionalized carbonized humic acid
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作者 Dairui Xie Hongcheng Zhang +4 位作者 Meng Jiang Hao Huang Heng Zhang Yang Liao Shilin Zhao 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2020年第10期2689-2698,共10页
Humic acid(HA)was carbonized at 300,400 and 500℃ and then functionalized with 1 wt%–12 wt%Fe(Ⅲ)respectively[CHA300/400/500-Fe(Ⅲ)].Adsorption of such Fe(III)-functionalized carbonized HA as adsorbents to aqueous te... Humic acid(HA)was carbonized at 300,400 and 500℃ and then functionalized with 1 wt%–12 wt%Fe(Ⅲ)respectively[CHA300/400/500-Fe(Ⅲ)].Adsorption of such Fe(III)-functionalized carbonized HA as adsorbents to aqueous tetracycline(TC:25 mg·L^-1)was studied.The adsorption equilibrium time for CHA400-Fe(Ⅲ)to TC was 6 h faster and the adsorption removal efficiency(Re)was two times higher than that of HA/CHA.The adsorption Reof CHA400-Fe(Ⅲ)loaded 10%iron[CHA400-(10%)Fe(Ⅲ)]to TC could reach 99.8%at 8 h and still kept80.6%after 8 cycles.The adsorption kinetics were well fitted to the pseudo-second-order equation and the adsorption isotherms could be well delineated via Langmuir equations(R^2N 0.99),indicating that the homogeneous chemical adsorption of TC occurred on the adsorbents.The main adsorption mechanisms of TC were complexation Fe(III)and hydrophobic distribution.Electropositive and electronegative repulsion between TC and CHA400-(10%)Fe(Ⅲ)at lowly p H(2)and highly p H(8–10)respectively,leaded to the relatively low adsorption capacity and more notable influence of ion concentration.When the p H was between 4 and 8,TC mainly existed in neutral molecules(TCH2),so the influence of ion concentration was not obvious.The dynamic adsorption results showed that the CHA400-(10%)Fe(Ⅲ)could continuously treat about 2.4 L TC(27 mg·L^-1)wastewater with the effluent concentration as low as 0.068 mg·L^-1.Our study suggested a broad application prospect of a new,effective,lowcost and environment-friendly adsorbent CHA400-(10%)Fe(Ⅲ)for treatment of low-concentration TC polluted wastewater. 展开更多
关键词 Fe(Ⅲ)-functionalized carbonized humic acid Composites ADSORPTION low-concentration tetracycline Waste water
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Combustion characteristics of low concentration coal mine methane in divergent porous media burner
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作者 Lin Baiquan Dai Huaming +3 位作者 Wang Chaoqun Li Qingzhao Wang Ke Zheng Yuanzhen 《International Journal of Mining Science and Technology》 SCIE EI 2014年第5期671-676,共6页
Low-concentration methane(LCM) has been one of the biggest difficulties in using coal mine methane.And previous studies found that premixed combustion in porous media is an effective method of low calorific gas utiliz... Low-concentration methane(LCM) has been one of the biggest difficulties in using coal mine methane.And previous studies found that premixed combustion in porous media is an effective method of low calorific gas utilization. This paper studied the combustion of LCM in a divergent porous medium burner(DPMB) by using computational fluid dynamics(CFD), and investigated the effect of gas initial temperature on combustion characteristic, the distribution of temperature and pollutant at different equivalence ratios in detail. Besides, the comparison of divergent and cylindrical burners was also performed in this paper. The results show that: the peak temperature in DPMB increases as the increasing of equivalence ratio, which is also suitable for the outlet NO discharge; the linear correlation is also discovered between peak temperature and equivalence ratios; NO emission at the initial temperature of 525 K is 5.64 times,larger than NO emission at the initial temperature of 300 K. Thus, it is preferable to balance the effect of thermal efficiency and environment simultaneously when determining the optimal initial temperature range. The working parameter limits of divergent burner are wider than that of cylindrical one which contributes to reducing the influence of LCM concentration and volume fluctuation on combustion. 展开更多
关键词 Divergent porous media low-concentration methane Premixed combustion Initial temperature
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Facile fabrication of dolomite-doped biochar/bentonite for effective removal of phosphate from complex wastewaters 被引量:2
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作者 Huan Xi Fanlu Min +1 位作者 Zhanhu Yao Jianfeng Zhang 《Frontiers of Environmental Science & Engineering》 SCIE EI CSCD 2023年第6期85-98,共14页
The removal of phosphate from wastewater using traditional biological or precipitation methods is a huge challenge.The use of high-performance adsorbents has been shown to address this problem.In this study,a novel co... The removal of phosphate from wastewater using traditional biological or precipitation methods is a huge challenge.The use of high-performance adsorbents has been shown to address this problem.In this study,a novel composite adsorbent,composed of dolomite-doped biochar and bentonite(DO/BB),was first synthesized via co-pyrolysis.The combination of initial phosphate concentration of 100 mg/L and 1.6 g/L of DO/BB exhibited a high phosphate-adsorption capacity of 62 mg/g with a removal efficiency of 99.8%.It was also stable in complex water environments with various levels of solution pH,coexisting anions,high salinity,and humic acid.With this new composite,the phosphate concentration of the actual domestic sewage decreased from 9 mg/L to less than 1 mg/L,and the total nitrogen and chemical oxygen demand also decreased effectively.Further,the cross-flow treatment using a PVC membrane loaded with DO/BB(PVC-DO/BB),decreased the phosphate concentration from 1 to 0.08 mg/L,suggesting outstanding separation of phosphate pollutants via a combination of adsorption and separation.In addition,the removal of phosphate by the PVC-DO/BB membrane using NaOH solution as an eluent was almost 90%after 5 cycles.The kinetic,isotherm and XPS analysis before and after adsorption suggested that adsorption via a combination of electrostatic interaction,complexation and precipitation contributed to the excellent separation by the as-obtained membranes. 展开更多
关键词 Biochar-bentonitecomposite Dolomite doping Phosphate adsorption Polymericmatrixmembrane Adsorption-filtration dual functions low-concentration phosphate
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Highly efficient and selective removal of phosphate from wastewater of sea cucumber aquaculture for microalgae culture using a new adsorption-membrane separation-coordinated strategy 被引量:2
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作者 Aihua Zhang Shihao Fang +4 位作者 Huan Xi Jianke Huang Yongfu Li Guangyuan Ma Jianfeng Zhang 《Frontiers of Environmental Science & Engineering》 SCIE EI CSCD 2023年第10期27-39,共13页
Enhanced phosphorus treatment and recovery has been continuously pursued due to the stringent wastewater discharge regulations and a phosphate supply shortage. Here, a new adsorption-membrane separation strategy was d... Enhanced phosphorus treatment and recovery has been continuously pursued due to the stringent wastewater discharge regulations and a phosphate supply shortage. Here, a new adsorption-membrane separation strategy was developed for rational reutilization of phosphate from sea cucumber aquaculture wastewater using a Zr-modified-bentonite filled polyvinyl chloride membrane. The as-obtained polyvinyl chloride/Zr-modified-bentonite membrane was highly permeability (940 L/(m2·h)), 1–2 times higher than those reported in other studies, and its adsorption capacity was high (20.6 mg/g) when the phosphate concentration in water was low (5 mg/L). It remained stable under various conditions, such as different pH, initial phosphate concentrations, and the presence of different ions after 24 h of adsorption in a cross-flow filtration system. The total phosphorus and phosphate removal rate reached 91.5% and 95.9%, respectively, after the membrane was used to treat sea cucumber aquaculture wastewater for 24 h and no other water quality parameters had been changed. After the purification process, the utilization of the membrane as a new source of phosphorus in the phosphorus-free f/2 medium experiments indicated the high cultivability of economic microalgae Phaeodactylum tricornutum FACHB-863 and 1.2 times more chlorophyll a was present than in f/2 medium. The biomass and lipid content of the microalgae in the two different media were similar. The innovative polyvinyl chloride/Zr-modified-bentonite membrane used for phosphorus removal and recovery is an important instrument to establish the groundwork for both the treatment of low concentration phosphate from wastewater as well as the reuse of enriched phosphorus in required fields. 展开更多
关键词 Adsorption-membrane low-concentration phosphate Zr-modified-bentonite RECYCLE Microalgal culture
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Daily exposure to low concentrations Tetrabromobisphenol A interferes with the thyroid hormone pathway in HepG2 cells
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作者 Taicheng An Lirong Lu Guiying Li 《Fundamental Research》 CAS CSCD 2023年第3期384-391,共8页
Tetrabromobisphenol A(TBBPA)is a flame retardant that adversely affects the environment and human health.The present study exposed HepG2 cells to low concentrations of TBBPA daily to investigate the changes in gene re... Tetrabromobisphenol A(TBBPA)is a flame retardant that adversely affects the environment and human health.The present study exposed HepG2 cells to low concentrations of TBBPA daily to investigate the changes in gene regulation,mainly related to pathways associated with the endocrine system.The quantitative polymerase chain reaction(qPCR)confirmed that prolonged exposure gradually activated the thyroid hormone and parathyroid hormone signaling pathways.The expression levels of genes related to the thyroid hormone signaling pathway were upregulated(1.15-8.54 times)after five generations of exposure to 1 and 81 nM TBBPA.Furthermore,co-exposure to 81 nM TBBPA and 0.5 nM thyroid hormone receptor antagonist for five generations significantly reduced the expression of thyroid hormone and parathyroid hormone receptors.Meanwhile,81 nM TBBPA inhibited the activation of the Ras pathway and downregulated Ras gene expression level(3.7 times),indicating the association between the toxic effect and thyroid hormone receptors.Additionally,our experiments revealed that the thyroid hormone pathway regulated the induction of the Ras signaling pathway by TBBPA.The study thus proves that daily exposure to TBBPA interferes with the thyroid hormone signaling pathway and subsequently the endocrine system. 展开更多
关键词 TBBPA low-concentration exposure Endocrine system Thyroid hormone receptor Ras signaling pathway
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The glucosinolate regulation in plant: A new view on lanthanum stimulating the growth of plant 被引量:4
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作者 Qing Yang Lihong Wang +3 位作者 Li Zhou Zhenbiao Yang Qing Zhou Xiaohua Huang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2019年第5期555-564,共10页
The harmful effect of low-concentration lanthanum [La(Ⅲ)] on plants was investigated by choosing horseradish as a representative of plants and using the methods of physics, analytical chemistry and biology. The resul... The harmful effect of low-concentration lanthanum [La(Ⅲ)] on plants was investigated by choosing horseradish as a representative of plants and using the methods of physics, analytical chemistry and biology. The results show that the genetic expressions related to glucosinolates(GLS, the marker of plant resisting harmful effects) synthesis are significantly increased after the endocytosis in leaf cells is initiated by low-concentrations La(Ⅲ). Consequently, the activities in the key enzymes for catalyzing the GLS synthesis are promoted. Meanwhile, the contents of the precursors and substrates in GLS synthesis are increased. All the above changes accelerate the GLS synthesis and result in the maximum increase in GLS content by 14%. Finally, the uptake of nutrient elements in horseradish is enhanced, and the yield of horseradish is maximally increased by 25%. Therefore, low-concentration La(Ⅲ) is harmful to plants, and plants can promote growth to resist the harmful effects of low-concentration La(Ⅲ) by regulating GLS content. The results show a new insight into how rare earth elements stimulate plant growth, and provide a reference for the risk assessment of rare earth elements. 展开更多
关键词 low-concentration RARE earth elements GLUCOSINOLATES GENETIC expression Response Harmful effect Environmental adaptation
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