Preparation and Properties of Nanocomposite MWCNTs/Polyamide Reverse Osmosis Membrane for Desalination by Interfacial Polymerization

摘要：

　　Thin film nanocomposite (TFN) polyamide (PA) reverse osmosis (RO) membranes incorporating carboxylic multiwall carbon nanotubes (c-MWCNTs) were successfully synthesized by interfacial polymerization with aqueous solution of m-phenylenediamine (MPD) containing c-MWCNTs and Isopar G solution oftrimesoly chloride (TMC).In order to improve the dispersion of MWCNTs in polymer matrix, carboxylic groups was modified onto the pristine MWCNTs by acid mixture (sulfuric acid and nitric acid of 3∶1 volume ratio) and mixture of sulfuric acid and hydrogen peroxide (4∶1 volume ratio).The feasibility of carboxylic on MWCNTs was evaluated by FT-IR, SEM, TEM and Raman spectroscopy analysis.Apparent size distribution and suspension of c-MWCNTs showed the well dispersion condition of c-MWCNTs in water which also proved the successful carboxylic of MWCNTs.The effect of c-MWCNTs incorporation into the PA selective layer on the surface morphology, separation performance and antifouling properties of the membranes were investigated and discussed.The leaf-like and granules outgrowth morphology of nanocomposite was observed by SEM and the c-MWCNTs incorporated in PA layer were observed by TEM.After doping c-MWCNTs, the water flux of TFN membranes increased due to higher hydrophilicity and additional water pathways of c-MWCNTs.It is noteworthy that the TFN membrane with 0.005 wt% c-MWCNTs could exhibit water flux as high as 68.3 L·m-2·h-1 and the NaCl rejection maintained at 96.0%.Meanwhile, the TFN membrane with 0.005 wt% c-MWCNTs showed better antifouling affinity than c-MWCNTs free membrane due to the increased in hydrophilicity as well as surface negative charge.Based on the result, it can be concluded that incorporating an appropriate amount ofc-MWCNTs into PA rejection layer could potentially improve the performance of TFN membrane during RO applications.

关键词： Nanocomposite reverse osmosis Multi wall carbon nanotubes Interfacial polymerization High water flux Antifouling

作者: Man Zhao Hui-feng Zhang Hai Huang Yu-shan Zhang

作者单位: College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100,Shandong, C Institute of Seawater Desalination and Multipurpose Utilization, State Oceanic Administration,Tianji

会议类型: 国际会议

会议名称: The 2016 China Functional Materials Technology and Industry Forum (2016中国国际功能材料大会暨第九届中国功能材料及其应用学术会议)

会议地点: 重庆

会议语种:英文

页码: 1016-1025

在线出版日期: 2016-07-25（万方平台首次上网日期，不代表论文的发表时间）