RSC Advances
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2018
·Vol. 8
·期 19
·10396-10408
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IF 2.936
Xiuzhen Wei,Xiaoyan Bao,Jiawei Wu,Cuixia Li,Yingying Shi,Jinyuan Chen,Bosheng Lv,Baoku Zhu
The rejection behaviors of two different charged composite hollow fiber nanofiltration (NF) membranes for six pharmaceutical molecules, primidone, carbamazepine, sulfamethoxazole, atenolol, sulfadimidine and norfloxacin, were characterized in this study. The saturation adsorption behaviors of the different pharmaceutical molecules on each membrane surface were studied and found to be related to the molecular weight, charge and hydrophilicity of the pharmaceutical molecules. After the pharmaceutical molecules reached adsorption equilibrium, the rejection rates of different NF membranes were characterized. The rejection rates of primidone, carbamazepine, sulfamethoxazole, atenolol, sulfadimidine and norfloxacin by the PEI-NF membrane were 85.6%, 91.8%, 79.9%, 98.1%, 93.3%, and 97.1%, respectively. Meanwhile, the rejection rates of the pharmaceutical molecules by the PIP-NF membrane were 82.2%, 85.4%, 91.5%, 79.1%, 87% and 93.3%, respectively. The influence of feed concentration, operation pressure, temperature, pH and ionic strength on the rejection behaviors of the different charged NF membranes were also studied.
研究领域:
环境科学
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DESALINATION
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2017
·
IF 5.527
Hao-Ran Zuo,Hui Lu,Gui-Ping Cao,Meng Wang,Yi-Ying Wang,Jing-Man Liu
To improve the efficiency of forward osmosis (FO) process, Na type ion exchange resin (IER-Na) powders were successfully blended into the support layer of FO membrane, which could introduce extra charged passageway. Consequently, the water flux of 5wt%IER-Na (with 5 wt% IER-Na loading) was 1.75 times as large as that of 0wt%IER-Na (with 0 wt% IER-Na loading), under the condition for evaluating FO performance (1.5 mol/L NaCl as draw solution and de-ionized water as feed solution in AL-DS mode). Notably, the salt rejection was retained above 95.0%. By multi-techniques such as SEM , EDS, ATR-FTIR and the analysis of diffusion coefficients in both polysulfone and IER-Na, it was proved that the enhanced water flux was mainly attributed to the extra charged passageway introduced by IER-Na. Meanwhile, the retained salt rejection was ascribed to the considerable salt rejection of extra charged passageway in IER-Na. This work sheds light on a new perspective in promoting the mass transfer in FO membranes.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2016
·
IF 5.393
Chi Yu,Yanhong Wang,Xuemei Lang,Shuanshi Fan
In this study, mechanical force applied to squeeze poly(sodium acrylate-co-2-hydroxyethyl methacrylate) hydrogels that contained seawater in order to obtain fresh water. By incorporating ionic monomer sodium acrylate (SA) into hydrogels, the salt rejection was significantly enhanced from 27.62% to 64.57% (feed concentration 35.00g/L NaCl solution). As SA’s concentration continuously increased, salt rejection declined due to the change in hydrogel’s matrix structure. Therefore, water recovery raised as the current swelling degree increased. We also measured pore size distribution by applying mercury intrusion porosimetry on each hydrogel sample in the interest of finding out whether the sample SA5/HEMA15 owned multi pore structure, since the result could be good for the desalination performance. After 4 times reused, the hydrogel remained good desalination performance. Although compared to reverse osmosis (RO) and multistage flash distillation (MSF) & multiple effect distillation (MED) the salt rejection of this hydrogel (roughly 64%) seemed low, the hydrogels can be used for forward osmosis and reverse osmosis, as pretreatment of seawater to reduce the energy consumption for the downstream.
研究领域:
高分子材料科学
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环境工程
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膜分离技术
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水资源处理
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功能材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xueyu Yuan,Jing Jiang,Zihao Zhou,Hongyu Pan,Chengwei Wang,Chor Yong Tay,Jinhua Hu,Li Liu,Bing Li,Yufeng Cai,Ming Liu
The designed thermally responsive polyionic liquid (TPIL)/ poly (diallyl dimethylammonium chloride) (PDDA) hydrogel with a semi-interpenetrating (semi-IPN) structure, containing highly charged chloride anions, was fabricated to explore the comprehensive capabilities of solar driven membrane-free osmotic desalination. Introducing linear PDDA polyelectrolyte with higher charge density has effectively excluded salt ions from entering the TPIL hydrogel matrix due to the strong charge concentration gradient established between the hydrogel and the saline reservoir. Meanwhile, the thermo-sensitivity of the polyionic liquid/PDDA semi-IPN (PNCl) hydrogel enabled the release of absorbed salt-depleted water at a temperature above the Lower Critical Solution Temperature (LCST). The multiple purification process established by partial submersion of PNCl hydrogel in saline enabled continual reduction of the salt ion concentration during the upwards transportation of water along the polyelectrolyte network. Moreover, a mushroom-shaped hydrogel demonstrated enhanced the effectiveness in long-term cyclic desalination. The “mushroom cap” was loaded with photo-thermal conversion fillers (Ti 3 C 2 T x MXene) to achieve higher photo-thermal conversion efficiency for water recovery. A record high salt rejection rate of more than 93% was obtained for membrane-free osmotic desalination. More importantly the whole desalination/water absorption/release process was solely supported by gently heating the PNCl hydrogel under the illumination of renewable solar energy.
研究领域:
材料科学
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环境工程
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水处理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2021
·
IF 8.742
Bing-Xin Gu,Zhuang-zhuang Liu,Kai Zhang,Yan-Li Ji,Yong Zhou,Cong-Jie Gao
Organic solvent nanofiltration (OSN) as a high-efficient membrane separation technology has play an important role in chemical industrial separation, clean energy production, and high-value resources recycling, etc. Inspired by the asymmetric biological structure of Desert beetle, herein a novel kind of polymeric OSN membranes with asymmetric structure have been fabricated via fluorinated polymeric networks (FPNs) regulated interfacial polymerization. The FPNs were formed with m-phenylenediamine (MPD), dopamine (DA) and 1H,1H,2H,2H-Perfluorodecane-thiol (PFDT) via the Michael addition and Schiff-base reaction. The FPNs tailored thin-film composite membrane (FPN-TFC) with biomimetic asymmetric structure, e.g., much hydrophilic looser front surface and much hydrophobic denser rear surface, exhibits an optimum ethanol permeance ~15.7 L m −2 h −1 .MPa −1 and high rejection ~99.5% for Rose Bengal (RB) dye molecules (test with 0.05 g L −1 RB ethanol solution at 25 °C under 1.5 MPa), which is almost 6 times higher than that of the conventional TFC membranes. Moreover, there is a good stability for the FPN-TFC membrane tested with different polar solvents in long-term operation process. Therefore, this work provides a guidance for the development of advanced polymeric OSN membranes with both high solvent permeability and solute selectivity, as well as good stability in OSN process, which would have broad application prospects in chemical and other industrial fields.
研究领域:
化学工程
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膜科学
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材料科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 29
·15342-15355
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IF 8.867
Libin Yang,Zhan Wang,Jinglong Zhang
The preparation of high-permselectivity membranes is still a challenging task due to the limitations of conventional polymeric membranes. Herein, a chelation-assisted interfacial reaction (CAIR) was used to construct an MOF/polymer hybrid layer on a hydrolyzed polyacrylonitrile (HPAN) substrate to form a ZIF-8/PEI–HPAN composite membrane. Due to the strong chelating ability of polyethyleneimine (PEI) to metal ions, the formed ZIF-8/PEI selective layer showed high hydrophilicity and super wettability. Moreover, its surface morphology changed from a smooth structure to a ridge-and-valley structure via controlling the interfacial reaction conditions, leading to enhancement in the permeable area. As a result, the prepared ZIF-8/PEI–HPAN composite membrane exhibits a rejection of 99.2% for Congo red aqueous solution with a permeance of up to 78 L m−2 h−1 bar−1, which is 5–8 times that of the reported polymeric membranes with excellent dye rejection as well as good long-term stability. We anticipate that the CAIR method can be used as a potential strategy for the preparation of polymer-supported MOF membranes with both highly enhanced permeability and good retention.
研究领域:
材料科学
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膜技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2021
·
IF 5.909
Yan Li,Shu Xiong,Xiangying Tang,Hao Wu,Chao Han,Ming Yi,Yan Wang
Salt accumulation is inevitable in the conventional textile wastewater treatment , which hardly realize the effectively remove of dye and recover of water. Loose nanofiltration (NF) membrane with highly hydrophilic surface and loose structure has been demonstrated as an optimal choice for efficient dye/salt separation. This study develops a loose NF membrane via the layer-by-layer (LbL) assembly of highly-branched sulfonated polyethyleneimine (SPEI)/polyethyleneimine (PEI) and mussel-inspired post-crosslinking. Different molecular weights of highly-branched SPEI are synthesized. Effects of LbL assembly and cross-linking process, SPEI molecular weight and crosslinker type are investigated systematically. It is found that the membrane prepared with the assembly of SPEI10k/PEI and crosslinked by catechol exhibits low roughness (Ra = 3.56 nm), high hydrophilicity (WCA = 44.07°) and negatively-charged membrane surface (ζ = −16.39 mV). As a result, the membrane achieves an ultrahigh permeability (~ 36.89 LMH/bar), excellent dyes retention (> 99.37% to Congo red), as well as low rejection to salts (2.47% to NaCl). The novel loose NF membrane developed in this work therefore shows a promising prospect in practical industrial textile wastewater treatment.
研究领域:
环境工程
·
材料科学
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2019
·
IF 7.913
Xian Bao,Qinglian Wu,Wenxin Shi,Wei Wang,Huarong Yu,Zhigao Zhu,Xinyu Zhang,Zhiqiang Zhang,Ruijun Zhang,Fuyi Cui
Developing a forward osmosis (FO) membrane with superior ammonia selectivity and robust antifouling performance is important for treating domestic wastewater (DW) but challenging due to the similar polarities and hydraulic radii of NH 4 + and water molecules. Herein, we investigated the feasibility of using polyamidoamine (PAMAM) dendrimer to simultaneously enhance the ammonia rejection rate and antifouling capacity of the thin-film composite (TFC) FO membrane. PAMAM dendrimer with abundant, easily-protonated, terminal amine groups was grafted on TFC-FO membrane surface via covalent bonds , which inspired the TFC-FO membrane surface with appreciable Zeta potential (isoelectric point: pH = 5.5) and outstanding hydrophilicity (water contact angle: 39.83 ± 0.57°). Benefiting from the electrostatic repulsion between the protonated amine layer and NH 4 + -N as well as the concentration-induced diffusion resistance, the introduction of PAMAM dendrimer endowed the grafted membrane with a superior NH 4 + -N rejection rate of 98.23% and a significantly reduced the reverse solute flux when using NH 4 Cl solutions as feed solution. Meanwhile, the perfect balance between the electrostatic repulsion to positively-charged micromoleculer ions (metal ions and NH 4 + -N) and the electrostatic attraction to negatively-charged macromolecular organic foulants together with the hydrophilic nature of amine groups facilitated the enhancement of the grafted membranes in antifouling capacity and hence the NH 4 + -N selectivity (rejection rate of 91.81%) during the concentration of raw DW. The overall approach of this work opens up a frontier for preparation of ammonia-selective and antifouling TFC-FO membrane.
研究领域:
环境工程
·
材料科学
·
水处理
·
膜技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Bin Wu,Weiyi Fan,Ruochen Wang,Naixin Wang,Yue Shen,Mwema Wanjiya,Yanhui Wu,Quan-Fu An
Organic molecule desalination with nanofiltration has important practical application significance. Zwitterion-based nanofiltration membranes (ZNFMs) with selective channels for monovalent salts have been prepared to improve the separation performance. However, most ZNFMs tend to be restricted by their loose structures, which results in unsatisfactory rejection for small molecules with sub-200 Da molecular weight. In this study, a synchronous modification strategy during the heat treatment of interfacial polymerization was proposed, in which various multi-amine solutions were employed as the novel medium of heat treatment to regulate the structures of ZNFMs. The pore size distribution of membranes could be narrowed to a certain degree through cross-linking by corresponding multi-amines. The optimized ZNFMs exhibited excellent retention to small molecules. For example, the retention of glucose was dramatically increased to 96.5%. Meanwhile, the ZNFMs also had low rejection for monovalent salts, such as KCl (26.7 %). Consequently, the separation factor between glucose and KCl reached 21.2, which demonstrated a great potential for organic molecule desalination with sub-200 Da molecular weight.
研究领域:
化学工程
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材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）