Layer-by-Layer Assembly for Preparation of High-Performance Forward Osmosis Membrane

5th Annual International Conference on Material Science and Environmental Engineering

材料科学;生态环境科学

Yang, Libin^1 ; Zhang, Jinglong^1 ; Song, Peng^1 ; Wang, Zhan^1

Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry and Chemical Engineering, Beijing University of Technology, Beijing, China^1

关键词: Forward osmosis;    Forward osmosis membrane;    Forward osmosis membranes;    Layer by layer;    Layer-by-layer approaches;    Layer-by-layer assemblies;    Pressure-retarded osmosis;    Structure and performance;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/301/1/012032/pdf
DOI  :  10.1088/1757-899X/301/1/012032

来源: IOP

【 摘 要 】

Forward osmosis (FO) membrane with high separation performance is needed to promote its practical applications. Herein, layer-by-layer (LbL) approach was used to prepare a thin and highly cross-linked polyamide layer on a polyacrylonitrile substrate surface to prepare a thin-film composite forward osmosis (TFC-FO) membrane with enhanced FO performance. The effects of monomer concentrations and assembly cycles on the performance of the TFC-FO membranes were systematically investigated. Under the optimal preparation condition, TFC-FO membrane achieved the best performance, exhibiting the water flux of 14.4/6.9 LMH and reverse salt flux of 7.7/3.8 gMH under the pressure retarded osmosis/forward osmosis (PRO/FO) mode using 1M NaCl as the draw against a DI-water feed, and a rejection of 96.1% for 2000 mg/L NaCl aqueous solution. The result indicated that layer-by-layer method was a potential method to regulate the structure and performance of the TFC-FO membrane.