Polyamide thin film composite membranes on cross-linked polyimide supports: Improvement of RO performance via activating solvent
Polyamide thin film composite membranes on cross-linked polyimide supports: Improvement of RO performance via activating solvent
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DOI：
10.1016/j.desal.2014.02.009
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发表时间：
2014-07-01
期刊：
影响因子：
9.9
通讯作者：
Livingston, A. G.
中科院分区：
文献类型：
--
作者：
Gorgojo, P.;Jimenez-Solomon, M. F.;Livingston, A. G.
对于薄膜复合（TFC）反渗透（RO）膜，在水渗透性和盐截留率之间的权衡是明显的;并且为了改善其RO性能，期望在不牺牲选择性的情况下增加通量。本文介绍了高溶剂稳定性的交联聚酰亚胺UF支持和使用的活化溶剂作为一种策略，以增加水通量的聚酰胺TCF膜的制造，并在某些情况下，水渗透和盐截留率同时增加。在用二甲基甲酰胺（DMF）作为活化溶剂进行后处理之前和之后的NaCl截留率和水渗透率方面评价性能。此外，通过SEM表征了TFC膜的形态，通过接触角测量确定其亲水性，并且通过基于流动电位的方法获得zeta（xi）-电位。NaCl截留率被认为是改善TFC膜与初始NaCl截留率低于90%，达到94%的最大值。水渗透性也增加，并且对于具有低初始渗透性值的膜增加更大程度。当TFC膜的初始透过率为0.2 L·m（-2）·h（-1）·bar（-1）时，膜的透过率提高到1.6 L·m（-2）·h（-1）·bar（-1），截留率达到93.8%。(C)© 2014 Elsevier B. V.保留所有权利。
For thin film composite (TFC) reverse osmosis (RO) membranes, a trade-off is evident between water permeance and salt rejection; and yet to improve their RO performance it is desirable to increase flux without sacrificing selectivity. This paper describes the fabrication of polyamide TCF membranes on highly solvent stable crosslinked polyimide UF supports and the use of an activating solvent as a strategy to increase water flux; and in certain cases, water permeance and salt rejection are increased simultaneously. Performance was evaluated in terms of NaCl rejection and water permeance before and after post-treatment with dimethylformamide (DMF) as the activating solvent. Additionally, the morphology of the TFC membranes was characterized by SEM, their hydrophilicity was determined by contact angle measurements, and zeta (xi)-potential was obtained by a streaming potential based method. NaCl rejection was found to be improved for TFC membranes with initial NaCl rejections below 90%, reaching a maximum value of 94%. Water permeance was also increased and to greater extent for membranes with low initial permeance values. The biggest improvement was obtained for a TFC membrane with initial permeance value of 0.2 L.m(-2).h(-1).bar(-1), rising to 1.6 L.m(-2).h(-1).bar(-1) with a rejection of 93.8%. (C) 2014 Elsevier B.V. All rights reserved.