DESALINATION
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2010
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IF 2.034
Zhenghua Zhang,Quanfu An,Yanli Ji,Jinwen Qian,Congjie Gao
The zero shear viscosity of two kinds of polysulfone (PSF) casting solutions and the morphology and permeability of their membranes prepared via the phase-inversion process were investigated. The zero shear viscosities, dominated by changing the concentration of PSF and the molecular weight of poly(vinyl pyrrolidone) (PVP) additive for the PSF/N, N-Dimethylacetamide (DMAC) binary system and PSF/DMAC/PVP ternary system respectively, were measured by a falling sphere viscometer . The cloud point of solutions was investigated in the cloud point experiment, and the phase-inversion process was monitored by the light transmittance apparatus. The surface and cross-section morphology of the corresponding membranes were characterized by SEM, and the water flux of the membranes was performed in the permeation experiment. Increasing the viscosity of the casting solution leads to the less porous surface and thick-skinned top-layer of the membrane. These experimental results are attributed to the mutable thermodynamic property of the system and the poor diffusion between components during the phase-inversion process, and finally results in the low water flux of PSF membranes. It suggests that the zero shear viscosity of the casting solution is one of the most important parameters for the morphology and permeability of membranes prepared via the phase-inversion process with the same coagulation bath .
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
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2014
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IF 2.269
Tao Xiang,Yi Xie,Rui Wang,Ming-Bang Wu,Shu-Dong Sun,Chang-Sheng Zhao
Polysulfone (PSf) membrane has been widely used in biomedical fields . In this study, we report the modification of PSf membrane via surface chemical reactions to improve the hydrophilicity and blood compatibility, and the modification is based on chloromethylated PSf (PSf-Cl) membrane. Different functional groups, including hydroxyl groups (–OH), azide groups (–N 3 ), amine groups (–NH 2 ), carboxyl groups ( - COOH) and sulfo groups (–SO 3 H) were introduced onto the PSf membrane surfaces , and the modified membranes showed obviously improved hydrophilicity. Meanwhile, the blood compatibility was also investigated, and the –COOH and –SO 3 H grafted membranes exhibited improved anticoagulant property.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Yan-Xin Xie,Kai-Kai Wang,Wen-Han Yu,Meng-Bing Cui,Yu-Jie Shen,Xiao-Yu Wang,Li-Feng Fang,Bao-Ku Zhu
To improve the permeability and antifouling properties of polyvinyl chloride (PVC) ultrafiltration (UF) membrane, amphiphilic sulfonated polysulfone (SPSF) was introduced into PVC matrix. Three types of PVC/SPSF blend membranes containing different SPSF with the sulfonation degree (SD) of 20%, 30%, and 50% were fabricated by non-solvent induced phase separation (NIPS) process. The excellent compatibility between PVC and SPSF was confirmed by differential scanning calorimetry (DSC). Surface chemical compositions , morphology, roughness, charge, hydrophilicity , permeability and antifouling properties of the pristine PVC membrane and the PVC/SPSF blend membranes were systematically compared and characterized. Due to the improved hydrophilicity and endowed negative charge, the blend membrane showed high water permeability (i.e. 880 L m −2 h −1 bar −1 ), high bovine serum albumin (BSA) rejection (i.e. 95.7%), and high flux recovery ratio (i.e. 96%), which outperformed ever reported and commercialized PVC membranes. Furthermore, the permeability and rejection properties of PVC/SPSF UF membranes were maintained after soaking in acidic and alkaline solutions for 30 days, indicating their outstanding acid and alkali tolerance. Therefore, SPSF was expected as a potential versatile modifier for fabricating high performance UF membranes.
研究领域:
材料科学
·
环境工程
·
膜技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2018
·
IF 6.578
Rui Wang,Xiansong Shi,Ankang Xiao,Wei Zhou,Yong Wang
Covalent organic frameworks (COFs) represent a new family of porous polymers with highly ordered two or three-dimensional channels. Although numerous studies have been focused on the design and synthesis of COF in the form of powders, the development of COF-based separation membranes is still hampered by the challenges of COF particles agglomeration and harsh synthetic conditions. In this work, interfacial polymerization (IP) directly performed on polymeric substrates as employed in the traditional IP process of polyamide (PA) membranes is developed for the synthesis of COF-based membranes. With the moderate reaction rate between monomer pairs in corresponding aqueous and organic solutions, a conformal growth of COF crystallites directly composited with the polysulfone (PSF) ultrafiltration substrates can be realized within 1 min. The synthesis parameters including reaction time and precursor concentrations are optimized, and thus-synthesized COF/PSF membrane presents a stable rejection to dye (Congo red) of 99.5% with a high water permeance of up to 50 L m −2 h −1 bar −1 , which is 2–10 times higher than that of many other membranes with similar rejection. This convenient IP process is expected to facilitate the up-scaling and real-world applications of COF-based membranes.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Chuang-Chao Sun,Ming-Yong Zhou,Jia-Jia Yuan,Yan Yan,You-Zhi Song,Li-Feng Fang,Bao-Ku Zhu
Nanofiltration membranes (NFMs) with negatively-charged nanochannels (NCNs) are of critical significance for enhancing the rejection of divalent anions. Herein, NFMs with NCNs are fabricated through a facile coating-heating route. Sulfonated polysulfone (SPSF) nanoparticles (13–40 nm) dispersed in aqueous phase are used to generate a dense layer on PES ultrafiltration (UF) membranes with different molecular weight cut-off (MWCO). It is found that the differences in the roughness of the substrates have significant contributions to the packing process of the SPSF nanoparticles, which indicate the smooth surface can be the better one. Scanning electron microscopy (SEM) images suggest the successful fabrication of the dense layer about 200 nm on different substrates. The resultant membranes feature selective layers with the nanochannels from 0.7 to 1.2 nm in average and zeta potential measurements indicate the nanochannel layers are negatively charged, causing the salts rejection in the following sequence: Na 2 SO 4 > NaCl > MgSO 4 > MgCl 2 . Furthermore, the constructed membranes exhibit an excellent separation performance with the water flux of 7.2 L m −2 h −1 bar −1 and the rejection rate for Na 2 SO 4 of 94%, which demonstrates a novel economic and effective approach towards fabrication of nanofiltration membranes.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Can Liu,Yujie Li,Qi Liu,Jun Liu,Yafei Guo,Xiaoping Yu,Yingchun Xie,Tianlong Deng
The removal of 137 Cs from radioactive wastewater remains a huge challenge due to the interference of many coexisting ions. Several tin chalcogenides (X 2 Sn 3 Y 7 , X Na, K; Y Te, Se, S) were synthesized and screened for highly selective cesium removal from radioactive wastewater. It was found that Na 2 Sn 3 S 7 showed the best adsorption performance for low cesium concentrations. Especially after nickel doping, the adsorption capacity and thermal stability of the adsorbent were significantly enhanced. Its maximum adsorption capacity reached 436.72 mg·g −1 within only 5 min and adsorption performance kept active in the pH range of 2–12. After being coated with a porous polysulfone (PSF) fiber, the developed PSF-Na 2.1 Ni 0.05 Sn 2.95 S 7 was applied to natural complex water with cesium concentration of 17.58 mg·L −1 . The separation factors between Cs + and competitive ions ranged from 625.21 to 13123.21. It is noteworthy that NaNO 3 was an efficient regenerating agent and can be easily separated from the CsNO 3 mixture for cyclic utilization. Remarkably, only 45 min in each cycle of adsorption and desorption toward cesium was realized, and the adsorption properties hardly decreased even after 50 consecutive cycles. The above advantages make the proposed material an excellent candidate for efficient Cs + removal and enrichment from wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
·
IF 3.898
Sihan Huang,Yaohan Chen,Xue Wang,Jing Guo,Yonggang Li,Lei Dai,Shenghai Li,Suobo Zhang
The past few decades have witnessed rapid gains in our demands of antifouling membranes such as water purification membranes and hemodialysis membranes. A variety of methodologies have been proposed for improving the antifouling performance and the hemocompatibility of the membranes. In this study, a series of copolymers (PSF-PESSB) containing polysulfone (PSF) and poly(arylene ether sulfone) bearing pendant zwitterionic sulfobetaine groups (PESSB) were prepared via one-pot polycondensation . Subsequently, the ultrafiltration (UF) membranes were prepared from different zwitterion-containing copolymers. The prepared membranes showed high thermal stability and mechanical properties. Besides, it also displayed attractive antifouling performance and blood compatibility. Compared with the original PSF membrane, the amount of protein absorption on the modified membrane was reduced; the flux recovery ratio and the resistance to blood cells were significantly improved. The results of this work suggest that PSF-PESSB membranes are expected to be applied in blood purification. The introduction of zwitterion-containing polymers to membranes paves ways for developing advanced hemodialysis technologies for crucial process.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Nan Sun,Shucheng Mo,Pengjia Dou,Chenjun Dong,Tao He
Forward osmosis (FO) has been proposed as an ecologically friendly and low carbon footprint technology for concentrating enriched lithium brine from the salt lake using freely available MgCl 2 onsite as the draw. In this process, Li + concentration is raised from a few hundred mg/L to 20-30 g/L (Li + ) before precipitation of Li 2 CO 3 . To allow FO technology a wide margin in competing with other concentration technologies, it is highly desirable to develop a simple, low cost method to fabricate FO membrane . Besides, due to both feed and draw solutions being of high salinity, FO membranes should also have a defect-free polyamide (PA) separation layer and a low structural parameter ( S ) substrate. This paper presents a simple guideline called approaching ratio (α) to adjust the substrate pore morphology based on a ternary polysulfone (PSf)/N,N-dimethylacetamide (DMAc)/diethylene glycol (DEG) solution. The α ranging between 0 and 100 % is a metric measuring how close the solution is to the cloud point. The increase of α endows instant phase separation, resulting in the substrate with increased surface porosity and sponge-like structure. Pore connectivity is improved following an increase of α below a threshold value of 50 %. Water permeability dramatically increases from α = 0 % to α = 50 % and declines at above 50 % for forming the closed cellular pores at α = 80 %. The FO water flux shows a similar trend which was found to be closely related to the substrate pore interconnectivity. The FO membrane was applied in the lithium concentration process using saturated MgCl 2 as the draw, the experimental results fit well with the FO model. The results demonstrate a simple, low-cost generic method to prepare FO membranes for applications with very high salinity feed and draw.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Yuliang Zhang,Yang Xu,Fei Wang,Wenchao Huang,Yanhua Lei,Xiaofeng Li,Xiaojing Sui,Zhiyan Li,Xueting Chang
This study presented a fabrication protocol for a multifunctional coating integrating photothermal responsiveness, self-lubrication, and self-healing properties. The coating was engineered by encapsulating tung oil (TO) within a polysulfone (PSF) matrix, leveraging the photothermal conversion capability of photothermal fillers to achieve localized thermal activation for on-demand lubricant release and crack repair. The PSF-encapsulated tung oil microcapsules (PSF-TO) and polypyrrole-coated boron nitride (PPy@BN) were uniformly dispersed in epoxy resin, followed by spin-coating or trickle-coating onto substrate surfaces. The coated substrate was thermally cured to form a robust composite film, with its photothermal performance, tribological performance, and self-healing capability systematically evaluated. The coating was able to reach a surface temperature of 83 °C under one sunlight intensity and was able to repair surface scratches within 155 s. At the same time, its delayed icing time can reach 380 s, and under a sunlight intensity, the surface icing can be melted and slipped off within 75 s. This work provided a scalable strategy for extreme mechanical environments, such as marine and aerospace applications.
研究领域:
材料科学
·
纳米技术
·
表面工程
·
高分子科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2016
·
IF 1.272
Yuhao Zhang,Chuang Yu,Zhenhua Lü,Sanchuan Yu
This study focused on the modification of flat-sheet polysulfone ultrafiltration membranes for nanofiltration (NF) through sequential deposition of poly(vinyl alcohol) (PVA) and sodium carboxymethyl cellulose (CMCNa) with glutaraldehyde cross-linking after each deposition. The contents of PVA and CMCNa in the coating solutions were varied to optimize the membrane performance and the modified membranes were characterized in terms of surface and permeation properties. It was found that the membrane surface became denser, more hydrophilic, and negatively charged at neutral pH after modification and the modified membrane possessed the NF separation characteristic. Under 5.0 bar, the optimized modified membrane exhibited a high-pure water flux of 89.5 l/m2 h and rejections of 37.8 and 93.8% to 500 mg/l NaCl and Na2SO4 aqueous solution, respectively. The modified membrane could also efficiently remove anionic dyes from aqueous solution, showing retentions of 99.7 and 99.5% to methyl blue and congo red, respectively, under neutral pH and 5.0 bar. Additionally, the modified membrane possessed good chlorine stability, and acid and alkaline resistances. The technique developed is potentially applicable for the fabrication of high-flux negatively charged NF membranes for partial desalination and anionic dye removal.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Dan Li,Xiaoqin Niu,Shiyuan Yang,Yuhong Chen,Fen Ran
We graft thermo-responsive polymer chains of PNIPAm, random polymer chains of P(NIPAm- co -Am), and P(NIPAm- co -GMA) on the surface of polyethersophone membrane via SI-eATRP method. The polymer chains of PNIPAm are thermo-responsive segment, and PAm and PGMA are hydrophilic and hydrophobic segment, respectively, which endow the modified membrane thermo-responsive property and adjust the lower critical solution temperature (LCST) of the modified membrane. The influence of temperature on membrane permeation and fouling process are investigated. The LCST is determined by filtration experiment at different temperature. The results show that all modified membranes have thermo-responsive behavior, and LCST of M-PNIPAm- co -PAm increased to 38 °C compared with M-PNIPAm; but M-PNIPAm- co -PGMA has the same LCST with M-PNIPAm. The modified membranes have higher flux than that of pristine polyethersulphone membrane whether feeding with pure water or BSA solution, which mainly owing to the hydrophilic surface and rich porosity of modified membranes.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Li-Jing Zhu,Hai-Ming Song,Gang Wang,Zhi-Xiang Zeng,Cun-Ting Zhao,Qun-Ji Xue,Xiao-Ping Guo
In situ pegylated (PEGylated) microporous membranes have been extensively reported using poly(ethylene glycol) (PEG)-based polymers as blending additives. Alternatively, free standing PEGylated polysulfone (PSf) membranes with excellent hydrophilicity and antifouling ability were directly fabricated from polysulfone/poly(ethylene glycol) methyl ether methacrylate (PSf/PEGMA) solutions after in situ cross-linking polymerization without any treatment via vapor induced phase separation (VIPS) process for the first time. The microstructures and performances of the resulting membranes shifted regularly by adjusting exposure time of the liquid film in humid air. With increasing exposure time, plenty of worm-like networks formed and distributed on membrane surfaces, meanwhile cross-sectional morphology changed from asymmetric finger-like microporous structure to symmetric cellular-like structure, resulting in better mechanical stability. As the exposure time raised from 0 to 5 min, the surface coverage of carboxyl groups increased from ∼1.1 to 4.0 mol%, leading to the decrease in water contact angle from ∼63 to 27° and the increase in water flux from ∼110 to 512 L m −2 h −1 . In addition, at prolonged exposure time, increasing hydrophilic PEG chains migrated to membrane surfaced and repelled the adsorption and deposition of protein, resulting in better antifouling ability. The findings of this study offer a facile and high efficient strategy for flexible design and fabrication of the in situ PEGylated membranes with desirable structures and performances in large scale.
研究领域:
材料科学
·
膜技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）