Versatile Surface Modification of TFC Membrane by Layer-by-Layer Assembly of Phytic Acid-Metal Complexes for Comprehensively Enhanced FO Performance

Environmental Science & Technology
Shu XiongYan Wang

Abstract

Polyamide TFC membranes are widely applied in membrane-based water treatment but generally suffer various fouling problems. In this work, the layer-by-layer assembly of phytic acid (PA) and metal ions (M) is constructed on the surface TFC membrane for the first time, to improve the bio/organic fouling resistances and separation performance of TFC membranes simultaneously. The PA molecule with six phosphonic acid groups of strong chelation ability acts as the organic ligand, and the metal ion acts as the inorganic cross-linker, inducing the assembly of hydrophilic and antibacterial PA-M (Ag or Cu) complexes on the TFC membrane surface. Various characterizations including FTIR, XPS, SEM, AFM, and EDX are employed to confirm the successful and uniform modification of PA-M. FO performance of the PA-M modified TFC membranes, i.e., TFC_PA-Ag and TFC_PA-Cu, is optimized by varying PA concentration and assembly cycles, where the water flux can be improved by 57% and 68%, respectively, without compromising the membrane selectivity. Additionally, the PA-M modification improves the biofouling and organic fouling resistances of the TFC membrane remarkably, owing to the enhanced antibacterial ability and hydrophilicity. The modified TFC mem...Continue Reading

References

Jul 13, 2013·Advanced Materials·Joung-Eun GuJung-Hyun Lee
Oct 2, 2015·International Journal of Molecular Sciences·Songcan ChenJun Ye
May 11, 2016·Environmental Science & Technology·François PerreaultMenachem Elimelech
Jul 6, 2016·Angewandte Chemie·Longbiao LiZhaohui Su
Feb 22, 2017·ACS Applied Materials & Interfaces·Cailong ZhouJiang Cheng

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