文献类型：期刊文献

英文题名：Mechanistic Insights into the Role of Polydopamine Interlayer toward Improved Separation Performance of Polyamide Nanofiltration Membranes

作者：Yang, Zhe[1];Wang, Fei[1];Guo, Hao[1];Peng, Lu Elfa[1];Ma, Xiao-hua[2];Song, Xiao-xiao[4];Wang, Zhiwei[3];Tang, Chuyang Y.[1]

机构：[1]Univ Hong Kong, Dept Civil Engn, Hong Kong 999077, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[3]Tongji Univ, Sch Environm Sci & Engn, Shanghai Inst Pollut Control & Ecol Secur, State Key Lab Pollut Control & Resource Reuse, Shanghai 200092, Peoples R China;[4]Zhejiang Univ Technol, Ocean Coll, Ctr Membrane & Water Sci & Technol, Hangzhou 310014, Peoples R China

年份：2020

卷号：54

期号：18

起止页码：11611

外文期刊名：ENVIRONMENTAL SCIENCE & TECHNOLOGY

收录：;EI(收录号：20204509457496);WOS:【SCI-EXPANDED(收录号:WOS:000572834700064)】；

基金：The work is partially supported by the Joint Research Scheme between Research Grants Council of Hong Kong and National Natural Science Foundation of China (no. N_HKU706/16) as well as the Peak Discipline Construction Program in Environment and Ecology of Shanghai. We appreciate the Electron Microscopic Unit (EMU) at The University of Hong Kong for SEM and TEM sample preparation and analysis.

语种：英文

外文关键词：Reverse osmosis - Thin films - Nanocomposite films - Water filtration - Composite membranes - Nanofiltration membranes - Osmosis membranes - Roofs

摘要：Interlayered thin-film nanocomposite membranes (TFNi) are an emerging type of membranes with great potential to overcome the permeability-selectivity upper bound of conventional thin-film composite (TFC) nanofiltration and reverse osmosis membranes. However, the exact roles of the interlayer and the corresponding mechanisms leading to enhanced separation performance of TFNi membranes remain poorly understood. This study reports a polydopamine (PDA)-intercalated TFNi nanofiltration membrane (PA-PSF2, PDA coating time of 2 h) that possessed nearly an order of magnitude higher water permeance (14.8 +/- 0.4 Lm(-2) h(-1) bar(-1)) than the control TFC membrane (PA-PFS0, 2.4 +/- 0.5 Lm(-2) h(-1) bar(-1)). The TFNi membrane further showed enhanced rejection toward a wide range of inorganic salts and small organic molecules (including antibiotics and endocrine disruptors). Detailed mechanistic investigation reveals that the membrane separation performance was enhanced due to both the direct "gutter" effect of the PDA interlayer and its indirect effects resulting from enhanced polyamide formation on the PDA-coated substrate, with the "gutter" effect playing a more dominant role. This study provides a mechanistic and comprehensive framework for the future development of TFNi membranes.