文献类型：期刊文献

英文题名：Nanofoaming of Polyamide Desalination Membranes To Tune Permeability and Selectivity

作者：Ma, Xiao-Hua[1,2];Yao, Zhi-Kan[2];Yang, Zhe[2];Guo, Hao[2];Xu, Zhen-Liang[1];Tang, Chuyang Y.[2];Elimelech, Menachem[3]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, 130 Meilong Rd, Shanghai, Peoples R China;[2]Univ Hong Kong, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R China;[3]Yale Univ, Dept Chem & Environm Engn, New Haven, CT 06520 USA

年份：2018

卷号：5

期号：2

起止页码：123

外文期刊名：ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS

收录：;EI(收录号：20180704807511);WOS:【SCI-EXPANDED(收录号:WOS:000425474600013)】；

基金：Supported by the Hong Kong Scholars Program (XJ2015015), the General Research Fund (Project 17207514) of the Research Grants Council of Hong Kong, the Strategic Research Theme (Clean Energy) and Seed Fund for Collaborative Research at the University of Hong Kong, the National Natural Science Foundation of China (21406060), the Fundamental Research Funds for the Central Universities (WA1514305), and the China Postdoctoral Science Foundation (2016M601527).

语种：英文

外文关键词：Morphology - Reverse osmosis - Economic and social effects - Osmosis membranes - Composite membranes

摘要：Recent studies have documented the existence of discrete voids in the thin polyamide selective layer of composite reverse osmosis membranes. Here we present compelling evidence that these nanovoids are formed by nanosized gas bubbles generated during the interfacial polymerization process. Different strategies were used to enhance or eliminate these nanobubbles in the thin polyamide film layer to tune its morphology and separation properties. Nanobubbles can endow the membrane with a foamed structure within the polyamide rejection layer that is approximately 100 nm in thickness. Simple nanofoaming methods, such as bicarbonate addition and ultrasound application, can result in a remarkable improvement in both membrane water permeability and salt rejection, thus overcoming the long-standing permeability-selectivity trade-off of desalination membranes.