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K2S2O8-Na2S2O3 initiated modification of anion exchange membrane grafted with sodium p-styrene sulfonate

Authors： LI Linlin1,2, ZHANG Lei1, SHI Shaoyuan2,3,4, CAO Renqiang2, LI Yujiao2, CAO Hongbin2,3,5

Units： (1. College of Chemical Engineering and Material Science, Tianjin University of Science & Technology, Tianjin 300457, China. 2. Key Laboratory of Green Process and Engineering, Beijing Engineering Research Center of Process Pollution Control, Innovation Academy for Green Manufacture, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China. 3. School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China. 4. Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, Jiangxi, China. 5. Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China

KeyWords： Anion exchange membrane; K2S2O8-Na2S2O3 system; Chemical grafting; Antifouling performance

ClassificationCode：TQ425

year,volume(issue):pagination： 2021,41(4):57-64

Abstract：

Surface modification is an effective way to solve the surface fouling of anion exchange membranes. In this work, the K2S2O8-Na2S2O3 redox system was used to initiate the grafting of sodium styrene sulfonate (SSS) onto the surface of anion exchange membrane. The properties of anion exchange membrane before and after modification were characterized by attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), scanning electron microscope (SEM), atomic force microscope (AFM) and a contact angle measuring instrument. Sodium dodecylbenzene sulfonate (SDBS) was used as a model pollutant to conduct fouling experiments to investigate the stability of the anti-fouling performance of the modified membrane. The characteristic absorption peak of the sulfonic acid group appears at 1032cm-1, which proves that sodium p-styrene sulfonate has been grafted to the surface of anion exchange membrane. After the membrane modification, the contact angle of modified AEMs decreases from 72° to 60° and the zeta potential changes from 0.92mV to -7.8mV, indicating that the grafting of sodium styrene sulfonate can effectively improve the hydrophilicity and negative charge density of the surface of modified anion exchange membrane. The optimized grafting conditions were obtained at 35℃, 1.0g/L of the grafting monomer concentration and 10min of the grafting time. Under the optimized grafting conditions, the obtained sodium p-styrene sulfonate modified AEM has improved its anti-fouling ability, with good stability and does not affect its desalination performance.

Funds：

国家自然科学基金(51878645)；河北省重点研发计划项目(20373605D)；2020年赣州市科技计划项目[赣市科发(2020) 60号]

AuthorIntro：

李林林（1995-），女，河南安阳，学生，硕士研究生，硕士，化学工程，E-mail：15093247306@163.com

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