Preparation and desalination performance of positively charged polyamide hybrid composite nanofiltration membranes
JIANG Zhi-bin1,3, YANG Hao1, LI Shi-qing1, TU Kai3, CHEN Shun-quan3, MIAO Jing2,3
1. Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan 430073, China; 2. Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China; 3. Guangdong Provincial Key Laboratory of Membrane Materials and Membrane Separation, Guangzhou Institute of Advanced Technology of Chinese Academy of Sciences, Guangzhou 511458, China
Abstract: The aqueous phase is formed by dispersing aminated multi-walled carbon nanotubes (MWCNTs-NH2) in the polyetherimide aqueous solution,and the organic phase is formed by mixing both isophthaloyl dichloride (IPC) and trimesoyl chloride (TMC) in hexane.Then the positively charged polyamide (PA) hybrid composite nanofiltration membranes are fabricated through making the aqueous solution and the organic phases perform interfacial polymerization on the surface of polysulfone (PSF) ultrafiltration membrane.The optimal concentration of MWCNTs-NH2 is determined as 0.16%.The thickness of active layer of MWCNTs-NH2/PA/PSF composite nanofiltration membrane prepared under optimal conditions is 155 nm,thinner than that of PA active layer.Under 0.4 MPa and ambient temperature,the rejection rate and the permeate flux of the prepared membranes against 1,000 mg·L-1 MgCl2 aqueous solution are 93.0% and 13.9 L/(m2·h),respectively.This positively charged PA hybrid composite nanofiltration membrane shows different rejection performances for different types of inorganic electrolytes,and can be applied to the pretreatment of seawater desalination,water softening,purification of drinking water,etc.
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