Impacts of reaction and curing conditions on polyamide composite reverse osmosis membrane properties
Impacts of reaction and curing conditions on polyamide composite reverse osmosis membrane properties
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DOI：
10.1016/j.memsci.2007.11.038
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发表时间：
2008-03-20
影响因子：
9.5
通讯作者：
Hoek, Eric M. V.
中科院分区：
文献类型：
--
作者：
Ghosh, Asim K.;Jeong, Byeong-Heon;Hoek, Eric M. V.
在此我们报道了有机溶剂性质、反应条件以及固化条件对聚酰胺复合反渗透膜分离性能、膜结构和界面性质的影响。我们提供了直接的实验证据表明：（1）间苯二胺（MPD）在有机相中的扩散率决定了MPD - 均苯三甲酰氯（TMC）薄膜的水渗透性；（2）MPD的扩散率和溶解度以相互竞争的方式影响MPD - TMC薄膜的交联；（3）水渗透性与MPD - TMC薄膜结构（即交联）的相关性最强；（4）盐截留率与MPD - TMC薄膜的厚度和形态的相关性最强。总体而言，具有食品盐截留能力的高通量膜似乎具有更薄、交联程度更高的膜结构。这种高性能反渗透膜可通过以下方式获得：（1）选择高表面张力、低粘度的溶剂；（2）在界面聚合过程中控制MPD的质子化和TMC的水解；（3）根据有机溶剂的挥发性优化固化温度和时间。最后，尽管还需要更多的研究，但我们的结果表明高性能MPD - TMC膜的褶皱形态和相对疏水性可能会增强浓差极化并加剧表面污染。（C）2007爱思唯尔有限公司保留所有权利。
Here we report on the impacts of organic solvent properties, reaction conditions, and curing conditions on polyamide composite reverse osmosis membrane separation performance, film structure, and interfacial properties. We provide direct experimental evidence that: (1) MPD diffusivity in the organic phase governs MPD-TMC thin film water permeability, (2) MPD diffusivity and solubility influence MPD-TMC thin film crosslinking in competing ways, (3) water permeability correlates most strongly with MPD-TMC film structure (i.e., crosslinking), and (4) salt rejection correlates most strongly with MPD-TMC film thickness and morphology. Overall, higher flux membranes with food salt rejection appear to comprise thinner, more heavily crosslinked film structures. Such high performance RO membranes are obtained by (1) selecting high surface tension, low viscosity solvents, (2) controlling protonation of MPD and hydrolysis of TMC during interfacial polymerization, and (3) optimizing curing temperature and time based on organic solvent volatility. Finally, although more research is necessary, our results suggest the rugose morphology and relative hydrophobicity of high performance MPD-TMC membranes might enhance concentration polarization and exacerbate surface fouling. (C) 2007 Elsevier B.V All rights reserved.