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Abstract
The composite nanofiltration membrane was prepared by coating the covalent crosslinked sulfonated polysulfone on porous substrate. Polyethylene glycol (PEG), dopamine (DA) and m-phenylenediamine (MPD) were used as crosslinkers, respectively. The polyethersulfone/sulfonated polysulfone substrate was prepared by phase inversion. The membrane surface chemistry, hydrophilicity, morphology, PWF and rejections of PEG, methyl red and Na2SO4 were characterized. The effects of different crosslinkers and their concentrations on membrane characteristics were investigated. The effect of the sulfonated polysulfone concentration on the membrane characteristic was also investigated. The PEG crosslinked membrane showed the lowest contact angle of 9.0°, the highest PEG-600 rejection of 99.8%, the highest methyl red rejection of 99.8%, and the rejection of Na2SO4 was 93.4% and the PWF was 3.1 L m−2 h−1. The DA crosslinked membrane had the highest PWF of 51.5 L m−2 h−1, and the rejections of PEG-600, methyl red and Na2SO4 were 46.0, 44.0, and 34.0%, respectively. The MPD crosslinked membrane had the lowest PWF and rejections.
Acknowledgments
The authors wish to sincerely thank the National Natural Science Foundation of China (Grant No. 21206121, 51373120, 51173132, 21274108, 21506160), Tianjin City High School Science & Technology Fund Planning Project (Grant No. 20090514), Tianjin Research Program of Application Foundation and Advanced Technology (Grant No. 14JCQNJC06400), the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry (No. 48), Tianjin Training Program of Innovation and Entrepreneurship for Undergraduates (Grant No. 201510058067) and State Key Laboratory of Separation Membranes and Membrane Processes (Tianjin Polytechnic University) Fund Program (Grant No. Z2-201508, Z2-201565) for financially supporting this work.