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Thin-film composite forward osmosis membranes modified by graphene oxide surface grafting for enhancing the anti-fouling capacity

Authors： ZHOU Qian, ZHAO Pin, LIU Hao, HU Yang, WANG Xinhua

Units： 1. School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122; 2. Jiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, Wuxi 214122; 3 Jiangsu Cooperative Innovation Center of Technology and Material of Water Treatment, Suzhou 215009

KeyWords： Thin film composite forward osmosis (TFC-FO) membrane; Surface modification; Graphene oxide; Organic fouling

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2022,42(4):81-88

Abstract：

A novel graphene oxide (GO) modified thin film composite forward osmosis (TFC-FO) membrane was successfully prepared via grafting GO to the surface of TFC-FO membrane by chemical coupling. Based on the characterizations of scanning electron microscopy (SEM), atomic force microscopy (AFM), contact angle mete and
AIR-FTIR and Zeta potential, it was well proven that the successful grafting of GO decreased the membrane surface roughness, enhanced the hydrophilicity, and made the modified TFC membrane more negatively charged. Moreover, permeation experiment was conducted using deionized water and 4 mol/L sodium chloride solution as feed solution and draw solution to test the membrane performance in terms of water flux and reverse salt flux, and fouling experiment was operated using 200 ppm sodium alginate as the feed solution to evaluate the anti-fouling behavior of membrane. Results showed that, comparing with the control TFC-FO membrane, the modified membrane had superior selectivity and presented obvious advantages in long-term fouling experiments. Then, the fouled membrane was further analyzed by SEM and confocal laser scanning microscopy (CLSM). The reduced sodium alginate on the membrane surface intuitively verified that the GO grafting modification improved the anti-organic fouling ability of TFC-FO membrane. This study provides a new idea for surface modified TFC-FO membrane to improve its anti-organic fouling capacity.

Funds：

国家自然科学基金青年项目（52100089）

AuthorIntro：

周倩（1998-），女，四川乐山人，硕士生，主要从事膜法水处理技术研究

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