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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Oligo- ethylene- glycol based thin- film composite nanofiltration membranes for effective separation of mono-/ di- valent anions
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Oligo- ethylene- glycol based thin- film composite nanofiltration membranes for effective separation of mono-/ di- valent anions

机译：基于寡聚醇的薄膜复合纳米过滤膜，用于单次/二价阴离子的有效分离

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摘要

Separation of monovalent and divalent anions is highly required in water treatment technologies for recycling concentrated brine resources, upgrading industrial separation processes and reducing the release of hazardous compounds into the environment. For the selective separation of monovalent and divalent anions, porous organic networks comprising oligo-ethylene-glycol units were finely tailored with porous structures, ion affinity and hydrophilicity. Enhanced cation affinity and tailored porous structures were achieved by using closely related oligo-ethylene-glycol-containing building blocks, including 1,2-bis(2-aminoethoxy)ethane (EDA), 4,7,10-trioxygen-1,13-tridecanediamine (DCA) and polyethylene glycol diamine (N-PEG). Thin-film composite (TFC) nanofiltration (NF) membranes were prepared by interfacial polymerization using oligo-ethylene-glycol-based amines with trimesoyl chloride (TMC) on a polyethersulfone support (PA@DCA, PA@EDA and PA@N-PEG TFC membranes). The sub-nanometer pore size of the PA@DCA film was larger than that of the PA@EDA film of 2 angstroms, and the PA@DCA TFC membrane exhibited a NaCl permeation 3-fold higher than that of the PA@EDA TFC membrane. Furthermore, the cation permeances of the oligo-ethylene-glycol-based membranes increased in the same order of cation affinity based on the valence of ions. These results indicated a translation of the properties of the oligo-ethylene-glycol units to ion-selective performances. Enhanced pure water permeance, faster NaCl permeance and high Na2SO4 rejection (more than 99%) were achieved at a reduced degree of cross-linking and a thinner thickness of the thin film layer. In terms of mono-/di-valent anion selectivity, the PA@DCA TFC membrane showed a performance 4-fold higher than that of the typically used commercial NF membranes, such as DOW NF 270. This strategy paves the way for microporous organic networks for the fabrication of nanofiltration membranes.
机译：价和二价阴离子的分离是非常需要在水处理技术用于回收浓缩盐水资源，提升工业分离过程和减少有害化合物的释放到环境中。为一价和二价阴离子的选择性分离，多孔有机网络包括低聚乙二醇单元微细地与多孔结构，离子亲和力和亲水性定制。增强的阳离子亲和力和定制的多孔结构通过使用密切相关的寡乙二醇含积木，包括1,2-双（2-氨基乙氧基）乙烷（EDA），4,7,10- trioxygen -1,13-实现-tridecanediamine（DCA）和聚乙二醇二胺（N-PEG）。薄膜复合（TFC）纳滤（NF）膜通过界面聚合在聚醚砜支撑（PA @ DCA，PA @ EDA和PA @ N-PEG使用具有均苯三甲酰氯（TMC）低聚乙二醇基胺制备的TFC膜）。所述PA @ DCA膜的亚纳米孔径比的2埃的PA @ EDA膜的大，并且PA @ DCA TFC膜显示出比PA @ EDA TFC膜的NaCl的渗透3倍。此外，基于低聚乙二醇膜的阳离子渗透率在阳离子亲和力的相同的顺序基于离子的价数增加。这些结果表明的低聚乙二醇单元，以离子选择性性能的属性的转换。增强的纯水渗透性，更快的NaCl渗透率和高硫酸钠抑制（超过99％）的交联度降低，并且薄膜层的较薄厚度得以实现。在单/二价阴离子选择性的观点出发，PA @ DCA TFC膜显示性能4倍比通常使用的商业NF膜，如DOW NF的更高270.这种策略铺平了微孔有机网络的方式对于纳滤膜的制造。

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