Aromatic solvent-assisted interfacial polymerization to prepare high performance thin film composite reverse osmosis membranes based on hydrophilic supports

POLYMER

卷:144

Article

Park, Sung-Joon¹  Kwon, Soon Jin¹  Kwon, Hyo-Eun¹  Shin, Min Gyu¹  Park, Sang-Hee¹  Park, Hosik²  Park, You-In²  Nam, Seung-Eun²  Lee, Jung-Hyun¹ 

[1] Korea Univ, Dept Chem & Biol Engn, 5-1 Anam Dong, Seoul 136713, South Korea

[2] Korea Res Inst Chem Technol, Ctr Membranes, Adv Mat Div, 141 Gajeong Ro, Daejeon 34114, South Korea

关键词: Polyamide thin film composite membrane;    Reverse osmosis;    Desalination;    Water treatment;    Interfacial polymerization;    Polyacrylonitrile;   

DOI  :  10.1016/j.polymer.2018.04.060

来源: Elsevier

【 摘 要 】

We report an aromatic solvent-assisted interfacial polymerization (IP) method to prepare high performance thin film composite reverse osmosis (RO) membranes based on a polyacrylonitrile support. The use of toluene and xylene as an organic solvent phase led to excellent water flux and unprecedentedly high NaCI rejection (similar to 99.9%), exceeding both the control membrane prepared using a conventional aliphatic solvent (n-hexane) and commercial RO membranes. The membrane prepared using n-hexane had a thick and moderately dense PA layer, due to the limited amine monomer diffusion, accounting for its relatively low performance. In contrast, the membranes fabricated using toluene/xylene had roof-like structures covering a thin and highly dense basal PA layer, which was formed by increased amine diffusion and an expanded miscible interface zone resulting from the enhanced miscibility of toluene/xylene with water. The excellent membrane performance achieved using toluene/xylene can be attributed to the thin and highly cross-linked basal PA layer. (C) 2018 Elsevier Ltd. All rights reserved.

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