rGO/ZIF-8改性聚酰胺纳滤膜的制备及分盐性能  

Preparation and Salt Separation Performance of rGO/ZIF-8 Modified Polyamide Nanofiltration Membrane

作　　者：吕永涛[1,2] 吴浩伟 文剑平 张颖[4] 何龙 王磊 LüYong-tao;WU Hao-wei;WEN Jian-ping;ZHANG Ying;HE Long;WANG Lei(School of Environmental and Municipal Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Laboratory of Membrane Separation of Shaanxi Province,Research Institute of Membrane Separation Technology of Shaanxi Province,Xi’an 710055,China;Beijing Origin Water Technology Co.Ltd.,Beijing 102206,China;Beijing Origin Water Membrane Technology Co.Ltd.,Beijing 101407,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055 [2]陕西省膜分离技术研究院陕西省膜分离重点实验室,陕西西安710055 [3]北京碧水源科技股份有限公司,北京102206 [4]北京碧水源膜科技有限公司,北京101407

出　　处：《中国给水排水》2021年第5期31-36,共6页China Water & Wastewater

基　　金：陕西省重点产业链(群)项目(2017ZDCXL-GY-07-01);陕西省重点科技创新团队计划项目(2017KCT-19-01);陕西省重点研发计划项目(2020SF-415)。

摘　　要：为了改善纳滤膜的性能,用水热合成法制备了rGO/ZIF-8复合纳米材料,通过界面聚合法引入到纳滤膜的功能层中,制成新型改性聚酰胺复合纳滤膜,并研究了改性膜的表面形貌、结构及分盐性能。结果表明:改性膜的表面出现沟壑状聚酰胺簇突起,粗糙度有较大提升,负电性增强,接触角降至42.7°,亲水性能有所提高。改性膜对Na_(2)SO_(4)的截留率由原状膜的95.8%下降至85.6%,但纯水通量提升近一倍,达到39.2 L/(m^(2)·h),且在连续48 h运行过程中性能稳定。由此可见,新型rGO/ZIF-8材料的引入虽然会导致截留率略有下降,但可以大幅提高改性纳滤膜的水通量。To improve the performance of nanofiltration membranes,the rGO/ZIF-8 composite nanomaterial was prepared by hydrothermal synthesis,and was introduced into the functional layer of the nanofiltration membrane by the interfacial polymerization method to make a new modified polyamide composite nanofiltration membrane.The surface morphology,structure and salt separation performance of the modified membrane were studied.It was found that gully-like polyamide cluster protrusions appeared on the surface of the modified membrane,the roughness was greatly improved,the negative electrical property was enhanced,the contact angle was reduced to 42.7°,and the hydrophilic property was improved.Using Na_(2)SO_(4)to investigate the salt separation performance,it was found that the original membrane’s rejection rate decreased from 95.8%to 85.6%,the pure water flux nearly doubled to 39.2 L/(m^(2)·h),and the performance of 48 h continuous operation was stable.The results show that although the introduction of the new rGO/ZIF-8 material will cause a slight decrease in the rejection rate,it can greatly increase the water flux of the modified nanofiltration membrane.

关 键 词：纳滤膜改性 rGO/ZIF-8 分盐性能 界面聚合 亲水性 

分 类 号：TU375[建筑科学—结构工程]