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Charge and separation characteristics of nanofiltration membrane embracing dissociated functional groups

Frontiers of Environmental Science & Engineering 2014年第5期8卷 650-658页

作者： zhun ma Meng WANG Xueli GAO Congjie GAO Key Laboratory of marine Chemistry Theory and Technology Ministry of Education College of Chemistry and Chemical Engineering Ocean University of China Qingdao 266100 China Environmental Simulation and Pollution Control State Key Joint Laboratory School of Environment Tsinghua University Beijing 100084 China

The current work focused on the investigation of charge and separation characteristics of nanofiltration （NF） membrane embracing dissociated functional groups under different electrolyte solutions. The electro-kinetic method was carried out to assess the membrane volume charge density （X） with different salt concentrations ranging from 0.1 to 10 mol. m-3 and different electrolyte species, such as type 1-1, type 2-1 and type 3-1. The Donnan steric pore model-dielectric exclusion （DSPM- DE） model was employed to evaluate the separation characteristics of the NF membrane for wide range of electrolyte concentration （from 25.7 to 598.9mol·m^-3）. The results indicated that the dissociation of the hydro- philic functional groups and the specific adsorption contributed to charge formation on membrane surface. The former played a dominant role in type 1-1 and type 2-1 electrolytes at dilute aqueous solutions （0.1-0.5 mol · m^3）. However, for type 3-1 electrolyte, specific adsorp- tion should contribute to the charge effect to a large extent. Moreover, the correlation between the volume charge density and feed concentration was in accordance with Freundlich isotherm. Furthermore, it was found that the separation characteristic of NF membrane could be evaluated well by DSPM-DE model coupling with electro-kinetic method in a whole concentration range.

关键词： Sulfonated polyethersulfone nanofiltrationmembrane charge characteristics electro-kinetic method,volume charge density separation behavior

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Removal of Mercury(Hg(Ⅱ)) from Seaweed Extracts by Electrodialysis and Process Optimization Using Response Surface Methodology

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Journal of Ocean University of China 2020年第1期19卷 135-142页

作者： SUN Jiuyi SU Xin LIU Zhen LIU Junlan ma zhun SUN Yongchao GAO Xueli GAO Jun College of Chemical and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of marine Chemistry Theory and Technology Ministry of EducationCollege of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100China

In this work,response surface methodology(RSM)was employed to model and optimize electrodialysis process for mercury(Hg(II))removal from seaweed ***-Behnken design(BBD)was utilized to evaluate the effects and the interaction of influential variables such as operating voltage,influent flow rate,initial concentration of Hg(II)on the removal rate of Hg(II).The developed regression model for removal rate response was validated by analysis of variance,and presented a good agreement of the experimental data with the quadratic equation with high value coefficient of determination value(R2=0.9913,RAdj 2=0.9678).The optimum operating parameters were determined as 7.17V operating voltage,72.54L h−1 influent flow rate and 5.04mgL−1 initial concentration of ***(II)removal rate of 76.45%was acquired under the optimum conditions,which showed good agreement with model-predicted(75.81%)*** results revealed that electrodialysis can be considered as a promising strategy for removal of Hg(II)from seaweed extracts.

关键词： electrodialysis seaweed extracts mercury removal response surface methodology Box-Behnken design

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Enhanced separation of tetrafluoropropanol from water via carbon nanotubes membranes:insights from molecular dynamics simulations

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Frontiers of Environmental Science & Engineering 2023年第11期17卷 251-262页

作者： Qing Li Xiaomeng Wang Ying Liu zhun ma Qun Wang Dongmei Xu Jun Gao Ruirui Wu Hui Sun Xueli Gao College of Chemical and Biological Engineering Shandong University of Science and TechnologyQingdao 266590China SEPCOIII Electric Power Construction Co.Ltd. Qingdao 266100China State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering Ningxia UniversityYinchuan 750021China Key Laboratory of marine Chemistry Theory and Technology(Ministry of Education) Ocean University of ChinaQingdao 266100China

Fluorinated alcohols exhibit promising prospects in chemical industry because of their special structure and many exciting properties,in which tetrafluoropropanol(TFP)is extensive applied in synthesis of pesticides,dyestuffs,variety of solvents and ***,the presence of TFP in water garners increasing attention globally because of their intrinsic potential to threat ecosystems and human *** nanotubes(CNTs)membranes are burgeoning candidates for TFP-water separation owing to well-endowed extraordinary structural and transport ***,a grand challenge lies in the rational design of CNTs for improving separation ***,molecular dynamics(MD)simulations were performed to investigate the effects of various parameters on the separation of TFP-water mixtures including feed temperature,CNTs pore diameters,and fluorine functionalization *** was found that TFP was pre-selected in CNTs ranging from 9.48 to 18.98Ådue to preferential adsorption and diffusion *** separation factor of 16 was achieved by(7,7)CNTs and the mass fraction of TFP was purified from 75%to 97.51%.Fluorine modified CNTs separated TFP and water by preferentially permeating water due to hydrogen bonding *** results showed that CNTs modified at both the entrance and interior had better separation performance than CNT modified only at one of these *** 100wt%water content in permeate was achieved by(11,11)CNTs modified with fluorine at the entrance and *** findings provide valuable insights for designing potential candidates for fluorinated alcohol-water azeotropic mixtures membrane separation,and promise extensive application aspects for the reclamation of fluorinated alcohol.

关键词： Fluorinated alcohol Carbon nanotube Molecular simulation Fluorine modified

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Surface modification of mesoporous silica nanoparticle with 4-triethoxysilylaniline to enhance seawater desalination properties of thin-film nanocomposite reverse osmosis membranes

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Frontiers of Environmental Science & Engineering 2020年第1期14卷 99-108页

作者： Jian Wang Qun Wang Xueli Gao Xinxia Tian Yangyang Wei Zhen Cao Chungang Guo Huifeng Zhang zhun ma Yushan Zhang The Institute of Seawater Desalination and Multipurpose Utilization Ministry of Natural Resources(Tianjin)Tianjin 300192China College of Chemical and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of marine Chemistry Theory and Technology(Ministry of Education) Ocean University of ChinaQingdao 266100China

Mesoporous silica nanoparticles(MSN),with higher water permeability than NaA zeolite,were used to fabricate thin-film nanocomposite(TFN)reverse osmosis(RO)***,only aminoalkyl-modified MSN and low-pressure(less than 2.1 MPa)RO membrane were *** this study,aminophenyl-modified MSN(AMSN)were synthesized and used to fabricate high-pressure(5.52 MPa)RO *** the increasing of AMSN dosage,the crosslinking degree of the aromatic polyamide decreased,while the hydrophilicity of the membranes *** membrane morphology was maintained to show a ridge-and-valley structure,with only a slight increase in membrane surface *** the optimum conditions(AMSN dosage of 0.25 g/L),when compared with the pure polyamide RO membrane,the water flux of the TFN RO membrane(55.67 L/m^2/h)was increased by about 21.6%,while NaCl rejection(98.97%)was slightly decreased by only 0.29%.However,the water flux of the membranes was much lower than *** considered that the enhancement of RO membrane permeability is attributed to the reduction of the effective thickness of the PA layer.

关键词： Thin film nanocomposite membrane Reverse osmosis Seawater desalination Aminophenyl-functionalized m esoporous silica nanoparticles

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Preparation of reverse osmosis membrane with high permselectivity and anti-biofouling properties for desalination

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Frontiers of Environmental Science & Engineering 2022年第7期16卷 73-86页

作者： Xinxia Tian Hui Yu Jun Yang Xiaotai Zhang man Zhao Yang Yang Wei Sun Yangyang Wei Yin Zhang Jian Wang zhun ma The Institute of Seawater Desalination and Multipurpose Utilization MNR(Tianjin)Tianjin300192China Tianjin Huanke Environment Consulting CO. LTDTianjin300191China College of Chemical and Biological Engineering Shandong University of Science and TechnologyQingdao266590China

High performance is essential for the polyamide(PA)reverse osmosis(RO)membranes during the desalination ***,RO membranes with high permselectivity and anti-biofouling properties were fabricated by nanoparticles incorporation and anti-biofouling ***(HT)incorporation was performed with a dual role,enhancing water flux and acting as grafting *** HT incorporation increased the water flux without sacrificing the salt rejection,compensating for the loss caused by the following grafting *** exposed surface of HT acted as grafting sites for anti-biofouling agent dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride(DMOTPAC).The combination of HT incorporation and DMOTPAC grafting endowed RO membranes with high permselectivity and anti-biofouling *** water flux of the modified membrane PA-HT-0.06 was 49.8 L/m^(2)·h,which was 16.4%higher than that of the pristine *** salt rejection of PA-HT-0.06 was 99.1%,which was comparable to that of the pristine *** to the fouling of negatively charged lysozyme,the modified membrane’s water flux recovery was superior to that of the pristine membrane(e.g.86.8%of PA-HT-0.06 compared to 78.2%of PA-pristine).The sterilization rates of PA-HT-0.06 for *** and *** were 97.3%and 98.7%,much higher than those of the pristine membrane(24.0%for *** and 26.7%for ***).

关键词： Anti-biofouling grafting Nanoparticle incorporation Sterilization rates Water flux Water flux recovery

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苯炔体系大环合成、自组装及其应用

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化学进展 2006年第2期18卷 281-289页

作者：王嬿嬿马谆范曲立黄维复旦大学先进材料研究院上海200433

含苯炔结构的大环(aryleneethynylenemacrocycle,AEMs)体系具有独特的性质和潜在的应用前景,在过去的数年中被广泛研究和探索。本文系统地介绍了AEMs的合成方法,包括不同关环方法、固相合成、模板合成和聚集驱动关环法等。在研究AEMs性... 详细信息

含苯炔结构的大环(aryleneethynylenemacrocycle,AEMs)体系具有独特的性质和潜在的应用前景,在过去的数年中被广泛研究和探索。本文系统地介绍了AEMs的合成方法,包括不同关环方法、固相合成、模板合成和聚集驱动关环法等。在研究AEMs性质方面,重点介绍了它们的自组装性能。同时也介绍了AEMs在构造三维纳米结构、液晶、管状通道、主客体复合物等超分子化学领域的应用。

关键词： AEMs 固相合成模板合成自组装超分子化学

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用于氢键组装的星形光电材料的合成与表征

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化学学报 2007年第18期65卷 2057-2062页

作者：王嬿嬿马谆王培黄维复旦大学先进材料实验室上海200433

合成了一系列具有光电活性的星状共轭分子,并在端基上引入了不同个数或不同类型的氢键基团.包括端基上分别带有1,2和3个羧酸基团的星状芴分子,以及结构更为刚性的3个端基均为2,4-二胺基三嗪环的三聚茚分子,以此形成一个系列的分子结构,... 详细信息

合成了一系列具有光电活性的星状共轭分子,并在端基上引入了不同个数或不同类型的氢键基团.包括端基上分别带有1,2和3个羧酸基团的星状芴分子,以及结构更为刚性的3个端基均为2,4-二胺基三嗪环的三聚茚分子,以此形成一个系列的分子结构,便于进行系统性研究.同时我们对这些星状分子进行了紫外和荧光光谱的表征,发现星状核和长烷基侧链能有效地阻止分子间π-π堆积和增大固态薄膜的无定形态.最终这些功能性分子将有望由氢键诱导在石墨或者金属表面形成有序的自组装结构.

关键词：光电材料星形芴三聚茚氢键组装

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Fluoride removal from secondary effluent of the graphite industry using electrodialysis:Optimization with response surface methodology

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Frontiers of Environmental Science & Engineering 2019年第4期13卷 45-55页

作者： Xiaomeng Wang Ning Li Jianye Li Junjun Feng zhun ma Yuting Xu Yongchao Sun Dongmei Xu Jian Wang Xueli Gao Jun Gao College of Chemical and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China School of Chemical and Environmental Engineering Weifang University of Science & TechnologyShouguang 262700China Key Laboratory of marine Chemistry Theory and Technology(Ministry of Education)/College of Chemistry and Chemical Engineering Ocean University of ChinaQingdao 266100China The Institute of Seawater Desalination and Multipurpose Utilization SOATianjin 300192China

Response surface methodology was utilized to model and optimize the operational variables for defluoridation using an electrodialysis process as the treatment of secondary effluent of the graphite industry. Experiments were conducted using a Box-Behnken surface statistical design in order to evaluate the effects and the interaction of the influential variables including the operational voltage, initial fluoride concentration and flow rate. The regression models for defluoridation and energy consumption responses were statistically validated using analysis of variance (ANOVA);high coefficient of determination values (R^2 = 0.9772 and R^2 = 0.9814;respectively) were obtained. The quadratic model exhibited high reproducibility and a good fit of the experimental data. The optimum values of the initial fluoride concentration, voltage and flow rate were found to be 13.9 mg/L, 13.4 V, 102.5 L/h, respectively. A fluoride removal efficiency of 99.69% was observed under optimum conditions for the treatment of the secondary effluent of the graphite industry.

关键词： Response surface methodology Fluoride removal Electrodialysis Box-Behnken design

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Chalcogen-dependent catalytic properties of RuX2 (X = S/Se/Te) nanoparticles decorated carbon nanofibers for hydrogen evolution in acidic and alkaline media

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Nano Research 2024年第4期17卷 2528-2537页

作者： Chengkai He Yue Wei Jia Xu Yujie Wei Tao Wang Rongfei Liu Lvlv Ji zhun Liu Sheng Wang School of materials Science and Engineering Zhejiang Sci-Tech UniversityHangzhou 310018China Department of Physics Shaoxing UniversityShaoxing 312000China Zhejiang Kangjiesi New material Technology Co. LTDZhuji 311800China

Transition metal dichalcogenides(TMDs),with the general formula MX_(2)(M=Mo/W/Fe/Co/Ni,etc.;X=S/Se/Te),have attracted extensive research interests for hydrogen evolution reaction(HER).Compared with numerous studies on noble-metal-free TMDs,the chalcogen-dependent HER catalytic properties of noble-metal-based TMDs are lack of sufficient research ***,a facile electrospinning-assisted synthetic strategy is proposed to synthesize ruthenium dichalcogenides(RuX_(2),X=S/Se/Te)nanoparticles decorated carbon nanofibers(CNFs).Benefiting from the identical nanofibrous morphology and exposed crystal planes of RuX_(2)(111),the catalytic activities of RuX_(2)@CNFs samples were investigated and compared in a fair and direct *** electrochemical measurements coupled with density functional theory calculations were carried out to probe their intrinsic HER catalytic activities,resulting in the catalytic activity order of RuS_(2)@CNFs>RuSe_(2)@CNFs>RuTe_(2)@CNFs in acidic media and that of RuS_(2)@CNFs>RuTe_(2)@CNFs>RuSe_(2)@CNFs in alkaline *** superior catalytic performance of RuS_(2)@CNFs mainly stems from the relative lower HER energy barriers and thereby the higher intrinsic catalytic activity of RuS_(2)(111),leading to ultralow overpotentials of 44 and 9 mV at 10 ma·cm^(-2) in acidic and alkaline media,***_(2)(111)is endowed with the more optimized Gibbs free energy of hydrogen adsorption(ΔGH*)than RuTe_(2)(111),but RuTe_(2)(111)shows enhanced catalytic property for H_(2)O dissociation and OH-desorption than RuSe_(2)(111),therefore,resulting in the altered catalytic activity sequences for RuSe_(2) and RuTe_(2) in acidic and alkaline media.

关键词： hydrogen evolution reaction transition metal dichalcogenides carbon nanofibers electrocatalysis catalytic activity

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Can perfluorooctanoic acid be effectively degraded usingβ-PbO_(2)reactive electrochemical membrane?

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Chinese Chemical Letters 2024年第7期35卷 196-199页

作者： Xubin Qian Lei Xu Xu Ge zhun Liu Cheng Fang Jianbing Wang Junfeng Niu College of Environmental Science and Engineering North China Electric Power UniversityBeijing 102206China College of Water Resources and Hydropower Engineering North China Electric Power UniversityBeijing 102206China Research Center for Eco-Environmental Engineering Dongguan University of TechnologyDongguan 523808China Global Centre for Environmental Remediation(GCER) University of NewcastleCallaghanNSW 2308Australia School of Chemical and Environmental Engineering China University of Mining and Technology(Beijing)Beijing 100083China

Aqueous perfluorooctanoic acid(PFOA)elimination has raised significant concerns due to its persistence and ***β-PbO_(2)plate anodes have shown efficient mineralization of PFOA,it remains unclear whether PFOA can be effectively degraded usingβ-PbO_(2)reactive electrochemical membrane(REM).Herein,we assessed the performance of Ti/SnO_(2)-Sb/La-PbO_(2)REM for PFOA removal and proposed a possible degradation *** a current density of 10 ma/cm2and a membrane flux of 8500(liters per square meter per hour,LMH),the degradation efficiency of 10 mg/L PFOA was merely8.8%,whereas the degradation efficiency of 0.1 mg/L PFOA increased to 96.6%.Although the porous structure of theβ-PbO_(2)REM provided numerous electroactive sites for PFOA,the generated oxygen bubbles in the pores could block the pore channels and adsorb PFOA *** hindered the protonation process and significantly impeded the degradation of high-concentration *** experiments indicated that·OH played dominant role in PFOA *** electrical energy per order to remove 0.1 mg/L PFOA was merely 0.74 Wh/L,which was almost an order of magnitude lower than that of other anode *** study presents fresh opportunities for the electrochemical degradation of low-concentration PFOA usingβ-PbO_(2)REM.

关键词： Perfluorooctanoic acid β-PbO_(2) Reactive electrochemical membrane Electrochemical oxidation

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