膜科学与技术

氧化石墨烯表面改性正渗透膜制备及其抗污染性能研究

作者：周倩，赵频，刘浩，胡阳，王新华

单位： 1.江南大学环境与土木工程学院，无锡 214122； 2.江苏省生物质能与减碳技术工程实验室，无锡 214122； 3.江苏省水处理技术与材料协同创新中心，苏州 215009

关键词：聚酰胺复合正渗透膜；表面改性；氧化石墨烯；有机污染

出版年,卷(期):页码： 2022,42(4):81-88

摘要：

利用化学偶联的方式将氧化石墨烯（GO）接枝到聚酰胺复合正渗透（TFC-FO）膜表面，成功制备出一种新型GO改性TFC-FO膜。通过扫描电子显微镜（SEM）、原子力显微镜（AFM）、接触角测量仪、傅里叶变换红外光谱仪（AIR-FTIR）和固体表面Zeta电位分析仪等表征手段，证明GO成功接枝到膜表面，并通过接枝改性降低了膜面粗糙度，增加了亲水性，并增强了荷负电性。然后，采用去离子水和4 mol/L氯化钠溶液作为进料液和汲取液，进行清水渗透试验，同时选取200 ppm海藻酸钠为特征污染物进行抗污染实验。渗透和污染试验结果表明，与未改性的TFC-FO膜相比，GO接枝处理使得改性TFC-FO膜的选择性和抗有机污染能力增强，且在长期污染实验中显示出明显的优势。膜表面污染层的SEM和激光共聚焦显微镜（CLSM）表征结果进一步验证了GO接枝改性确实提升了TFC-FO膜的抗有机污染性能。本研究为TFC-FO膜通过表面改性提升抗有机污染能力提供了一个新思路。

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.

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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