JOURNAL OF MEMBRANE SCIENCE
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2018
·
IF 6.578
Ming-Bang Wu,Xiao-Li Fan,Hao-Cheng Yang,Jing Yang,Ming-Ming Zhu,Ke-Feng Ren,Jian Ji,Zhi-Kang Xu
Nanofilms are of great interest as a kind of separation membranes for seawater desalination and wastewater treatment . Their fabrication, however, always needs a time-consuming process and shows low atom economy. Herein, we report pyrogallol/polyethyleneimine (PG/PEI) nanofilms spontaneously formed at the gas/liquid interface within ten minutes and composited on microporous substrates. Both the film thickness and the surface charge are facilely adjusted by the reaction time and the mass ratio of PG/PEI in aqueous solution. The solution is repeatedly used to fabricate the nanofilm composite membranes and thus this method is with high atom economy of raw materials. The as-prepared nanofilm composite membranes can be directly applied in aqueous nanofiltration , showing a relatively high water permeation flux (17.5 L m −2 h −1 bar −1 ) and salt rejection (>94% for MgCl 2 ) during a long-term operation. The nanofilms are also demonstrated potentials in organic solvent nanofiltration after moderate cross-linking by glutaraldehyde.
研究领域:
材料科学
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环境工程
·
化学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 67
·35769-35776
·
IF 3.708
Lei Hu,Aiqing Zhang,Kai Liu,Shan Lei,Guangxin Ou,Xinjian Cheng
Polyphosphazene/SiO2 composite membranes and porous polyphosphazene membranes were prepared and their properties were studied in detail. In this work, linear polyphosphazenes with 3-aminopropyltriethoxysilane (APTS) and n-butylamino side groups were prepared via the nucleophilic substitution reaction. The substituted polyphosphazenes were cross-linked by the hydrolysis of triethoxysilanes to form polyphosphazene/SiO2 composite membranes. When the as-prepared polyphosphazene/SiO2 composites were treated with HF, the silica dissolved and porous polyphosphazene membranes formed subsequently. Their structures and morphologies were studied by IR, DSA, DMA, XPS and SEM. And their mechanical properties were investigated as well. It could be seen that the thermal stability, the contact angles and the mechanical properties changed with the ratio of APTS. Namely, the contact angle changed from 74° to 96°, and the initial decomposition temperature increased from 170 °C to 225 °C when the ratio of APTS increased. Besides, the glass transition temperature increased from −48 °C to 31 °C after the membranes were cross-linked.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
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2020
·
IF 0
Yue Wen,Xingran Zhang,Xuesong Li,Zhiwei Wang,Chuyang Y. Tang
Widespread applications of reverse osmosis (RO)-based processes call for high-performance thin-film composite (TFC) membranes. In this study, a TFC membrane by incorporating an ultrathin 2D metal–organic framework (MOF) (ZnTCPP) interlayer was developed for water purification, and the mechanisms in enhancing membrane permeability and selectivity were revealed. The introduction of the 2D MOF nanosheet interlayer nearly tripled the membrane water permeance (4.82 ± 0.55 L m–2 h–1 bar–1) with a simultaneous increase of NaCl rejection (97.4 ± 0.6%) compared to the control, successfully overcoming the permeability–selectivity trade-off. The combined use of quartz crystal microbalance and transmission electron microscopy revealed that the MOF interlayer induced the significant changes in the polyamide membrane structure that favors water permeation, i.e., decreased intrinsic thickness, increased void volume fraction, and enhanced effective filtration surface area. Such improvements in the polyamide structure can be attributed to the synergistic effects of enhanced confinement to interfacially degassed nanobubbles and reduced diffusivity of m-phenylenediamine monomers due to the MOF interlayer. This interlayer also increased the cross-linking degree of the polyamide layer (contributing to the increase of membrane selectivity) and served as a gutter layer (to further enhance membrane permeance by reducing the geometric restriction of the support layer). Our study highlights the potential of using ultrathin MOF nanosheets to fabricate high-performance TFC membranes for desalination and water purification.
研究领域:
材料科学
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环境工程
·
化学工程
✓ 已验证
DOI
JOURNAL OF MEMBRANE SCIENCE
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2019
·
IF 7.015
Qianqian Lan,Yazhi Yang,Leiming Guo,Yong Wang
Highly permeable and cost-affordable membranes are highly desired in separation processes. Herein, such membranes are produced by designing gradient phenolics inside the macropores of polyvinylidene fluoride (PVDF) substrates. Solutions consisting of resol, poly(ethylene oxide)/poly(propylene oxide) copolymer and ZnCl 2 are infiltrated into the macropores of PVDF. Phenolic nanoparticles and nanopores with increasing sizes are formed across the membrane thickness after fast solvent evaporation, ZnCl 2 -facilitated resol polymerization and acid soaking. The prepared gradient phenolic@PVDF membranes exhibit a permeance up to 1315 L/(m 2 h bar), which is several times higher than that of other membranes with similar rejections to bovine serum albumin (91%) and lysozyme (71%). Moreover, the membranes are robust enough to withstand a pressure of at least 12.0 bar due to the interlaced structures of phenolics and PVDF. We demonstrate that thus-produced membranes can efficiently separate and concentrate gold nanoparticles with sizes down to 5 nm. This work suggests a new strategy for rational design of gradient porosities in macroporous substrates to produce robust membranes with high permeances and tight rejections.
研究领域:
材料科学
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化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Huachang Jin,Yang Yu,Xueming Chen
Electrochemical precipitation has been widely employed for recirculating cooling water softening because of its environmental friendliness, convenient operation, and high treatment efficiency. However, this technique uses many expensive electrodes, and thus requires a very large investment. In this study, a novel process called membrane-based electrochemical precipitation (MEP) was proposed and tested for water softening. This new process utilises membrane polarisation, an undesirable phenomenon that occurs in conventional electrodialysis , to precipitate hardness ions on the surface of membranes. Compared with conventional electrodialysis , MEP involves only one kind of exchange membrane . Moreover, unlike traditional electrochemical precipitation, MEP only needs one pair of electrodes, and thus can reduce equipment cost significantly. Different types of membranes were examined, and heterogeneous anion exchange membranes were found to be the best. It was demonstrated that MEP could soften water effectively. The precipitation rate and energy consumption were 64.0–84.6 g/h/m 2 and 8.8–12.0 kW h/kg CaCO 3 , respectively. The scale deposited on the membranes could be detached easily through polarity reversal of electrodes. Repeated experiments showed that MEP could run stably without any performance deterioration .
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Fuxin Zheng,Yunkun Wang
Antibiotics and extracellular resistance genes (eARGs) in wastewater pose a potential threat to human health and hinder wastewater reuse. In this study, we present a facile and designable approach for fabricating selective polyelectrolyte multilayer (PEM) NF membranes and evaluated their performance in antibiotics and eARGs rejection from wastewater effluent. We fabricated PEM NF membranes by layer-by-layer assembly of two strong polyelectrolytes, poly (diallyl dimethylammonium chloride) and poly (sodium styrenesulfonate). By systematic manipulation of the polyelectrolyte coating solution and deposition cycle, we obtained an asymmetric separation layer with loose bottom layers and dense top layers. The PEM membrane took full advantage of the high permeability of the loose polyelectrolyte layer and the high selectivity of the dense polyelectrolyte layer, which exhibited superior antibiotics retention while maintaining a comparable permeability to the NF270 membrane. In addition, the fabricated membranes showed excellent removal of eARGs, and membranes terminated with polyanionic electrolytes could further enhance eARG retention through electrostatic repulsion . Overall, membranes with more than four polyelectrolyte bilayers could retain >99.9% of eARG. The results show that the selective asymmetric PEM membranes provide an efficient solution for remediation of antimicrobial resistance (AMR) in wastewater.
研究领域:
环境科学
·
生物医学工程
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Yao Wang,Zhi Wang,Jixiao Wang
Enhancing membrane flux, rejection, antimicrobial and chlorine resistance has been the focus of reverse osmosis membrane research. The permselectivity, chlorine resistance and antimicrobial properties of a polyamide (PA) membrane were improved by immobilization of self-synthesized amine functional hydantoin derivative poly(3-allyl-5,5-dimethylhydantoin- co -vinylamine) (P(ADMH- co -VAm)). The chlorine resistance and antimicrobial property of the modified membrane could be regenerated due to the reversible transition between hydantoin and N-halamine. The lab-scale virgin and modified membranes were systematically characterized, and their performances were evaluated and compared with some representative commercial membranes. The modified membrane showed similar permselectivity, but higher and regenerable chlorine resistance and antimicrobial property as compared with the commercial membrane e.g., BW30FR. Next, a pilot-scale 0.4-m wide continuous membrane production process was performed to fabricate membrane element. The permselectivity of the modified element was also improved. During the six “chlorination-sterilization” operation cycles, the element exhibited high antimicrobial property with small permselectivity changes. Thus, both the lab-scale and pilot-scale testing results demonstrated the improved performances of the modified membrane.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 132
·期 2
·
IF 1.64
Zhenjiang Yu,Xuyang Liu,Fangbo Zhao,Xiaoyang Liang,Yu Tian
A novel low-cost SiO 2 /Polyvinylchloride (PVC) membrane with different nano-SiO 2 particles loading (0–4 wt %) was prepared by the phase-inversion process. The optimum nano-SiO 2 dosage was determined as 1.5 wt % based on the casting solution compositions, the membranes' mechanical properties and hydrophilicities, the pure water fluxes, microstructures, and absorption of protein. Compared with the bare membrane, the membrane with 1.5 wt % nano-SiO 2 addition presented better capabilities against the protein absorption and bacterial attachment, better antifouling performance, and higher flux recovery ratio in filtration of the supernatant liquor which collected from a secondary sedimentation tank in a municipal wastewater plant. The SiO 2 /PVC membranes have applicable potential in the municipal wastewater treatment for their low price, good antifouling performance and high removal efficiencies of SS (over 97.2%), COD (up to 82.9%) and total bacteria (more than 93.6%). © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41267.
研究领域:
环境科学
·
材料科学
·
水处理工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2017
·
IF 6.035
Yi-Fang Mi,Feng-Yang Zhao,Yao-Shen Guo,Xiao-Dan Weng,Chun-Chun Ye,Quan-Fu An
Antifouling performance of nanofiltration membrane is critical in applications like water treatment. In this study, surface zwitterionization was conducted by 1, 3-propanesultone ring-opening directly on the nanofiltration membrane prepared by interfacial polymerization of 3,3′-diamino-N-methyldipropylamine and 1, 3, 5-benzenetricarboxylic chloride. The zwitterionic structures improve the hydrophilicity of nanofiltration membrane, thus increase the water permeability and antifouling performance. The zwitterionic membrane have a 72 L m −2 h −1 water flux at the optimize condition, which was about 2.4 times that of the pristine membrane without zwitterionization, and with a 89% rejection of MgCl 2 . Meanwhile, the zwitterionic membrane will have better antifouling performance to protein and polysaccharose. The flux recovery ratio of bovine serum albumin, sodium alginate and lysozyme were all above 95%. The prepared zwitterionic membrane presents prominent high water flux and fouling-resistance performance, indicating it's promising application potential in organic wastewater treatment .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 5
·49768
·
IF 2.52
Yuanlu Xu,Yi Yang,Menghan Sun,Xinfei Fan,Chengwen Song,Ping Tao,Mihua Shao
In this study, the direct contact membrane distillation (DCMD) with a superhydrophobic membrane (SM-DCMD) herein was designed and applied to desalinate RO brine, showing excellent performance in desalinating high salinity. The superhydrophobic membrane with good resistance to pore wetting and fouling was prepared by coating silica nanospheres onto a porous glass fiber substrate and subsequent fluorination. It maintained a stable flux (31.27 LMH at feed temperate of 80°C) and outstanding salt rejection (~100%) even in the presence of natural organic matter (NOM, a typical organic foulant) and sodium dodecyl sulfate (SDS, a typical wetting agent with low surface tension). During handling practical reverse osmosis brine, such SM-DCMD system presented excellent performances in terms of a stable flux of 23.70 LMH and salt rejection efficiency of >99% over 24 h continuous operations. The relevant COD and color removal efficiency kept a constant value of 100%. These overall findings indicate that the SM-DCMD is a hopeful candidate for desalinating practical RO brine with high performance.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2015
·Vol. 17
·期 45
·8697-8702
·
IF 4.034
Xiaolin Wu,Jiang-Long Wang,Hongrui Zhang,Shufang Wang,Shengjun Zhai,Yaguang Li,Dogheche Elhadj,Guangsheng Fu
c-axis oriented Bi1−xPbxCuSeO (0 ≤ x ≤ 0.8) single crystalline thin films have been successfully epitaxially grown on SrTiO3 (001) substrates via the pulsed laser deposition technique. Detailed X-ray diffraction and transmission electron microscopy measurements reveal the excellent c-axis and ab-plane texture of the films. As the Pb doping concentration increases, both the resistivity and the Seebeck coefficient decrease due to the increase in hole carrier concentration. The highest power factor of about 1.2 mW m−1 K−2 has been achieved in Bi0.96Pb0.06CuSeO single crystalline thin films at 673 K, which is much higher than those of polycrystalline ceramics with random orientation, suggesting that c-axis oriented BiCuSeO-based single crystalline thin films might have great potential for application in thermoelectric thin film devices.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2020
·
IF 1.568
Xiang Sun,Fan Zhu,Xiaoyang Liu,Hongqian Ren,Minglong Xia,Mengjie Yang,Yi Feng,Huili Ding
The development of a proton exchange membrane (PEM) that can avoid rapid decay of proton conductivity under low humidity is of great significance for the practical application of PEMFC. In this study, acid–base core–shell microspheres (PCSMs-MA@TAC) with a carboxylic acid core and a triazine shell were synthesized by distillation-precipitation polymerization using cross-linked carboxylic acid microspheres (PMAA) as seeds. These PCSMs were then incorporated into a sulfonated poly(ether ether ketone) matrix to make hybrid membranes. Incorporation of PCSMs microspheres can not only strengthen the vehicle mechanism by increasing the water uptake of the membrane, but also the acid–base pairs formed at the SPEEK/PCSMs interface provide a new low-energy barrier pathway for proton hopping, thereby enhancing the proton conduction of the Grotthuss mechanism. The results show that when the content is 10 wt%, the proton conductivity of the SPEEK/PCSMs-MA@TAC composite membrane can reach 0.161 S cm−1 at 80°C and 100% RH, which is 19.3% higher than the SPEEK control membrane (0.135 S cm−1). In particular, even at 60% RH, the proton conductivity of the SPEEK/PCSMs-MA@TAC-10 composite membrane is still 67 mS cm−1, which is 3.16 times higher than that of the SPEEK membrane. Therefore, the SPEEK/PCSMs-MA@TAC composite membrane can maintain superior performance even under high temperature and low humidity conditions.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）