膜科学与技术

K2S2O8-Na2S2O3引发苯乙烯磺酸钠接枝阴离子交换膜改性

作者：李林林¹，²，张蕾¹，石绍渊²，³，⁴，曹仁强²，李玉娇²，曹宏斌²，³，⁵

单位： 1.天津科技大学化工与材料学院，天津 300457 2.中国科学院过程工程研究所绿色过程与工程重点实验室，北京 100190 3.中国科学院大学化学工程学院，北京 100049 4.中国科学院赣江创新研究院，赣州341000 5.天津化学化工协同创新中心，天津 300072

关键词：阴离子交换膜、K2S2O8-Na2S2O3体系、化学接枝、抗污染性能

DOI号：

分类号： TQ425

出版年,卷(期):页码： 2021,41(4):57-64

摘要：

通过K2S2O8-Na2S2O3氧化还原体系引发苯乙烯磺酸钠(SSS)接枝阴离子交换膜，用衰减全反射傅里叶变换红外光谱(ATR-FTIR)、扫描电子显微镜(SEM)、原子力显微镜(AFM)和接触角测量仪等对阴离子交换膜改性前后进行性质表征，并以十二烷基苯磺酸钠（SDBS）作为模型污染物进行污染实验，考察改性膜的抗污染性能及其稳定性。结果表明，苯乙烯磺酸钠（SSS）接枝后可有效改善阴离子交换膜表面的亲水性和负电荷密度，改性膜接触角由72°变为60°，表面电荷密度由+0.92mV变为-7.85mV，表明带负电荷的磺酸基团被成功接枝到阴膜表面。通过探究改性条件对改性膜性质的影响规律，发现当改性温度为35℃、单体浓度为1.0g/L、接枝时间为10min时改性效果最佳。该改性条件下获得的苯乙烯磺酸钠修饰阴离子交换膜抗污染能力明显提高、稳定性良好且不影响其脱盐性能。

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.

基金项目：

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]

作者简介：

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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