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Na2SO4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/(m2·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 Na2SO4to 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/(m2·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.
机构地区 西安建筑科技大学环境与市政工程学院 陕西省膜分离技术研究院陕西省膜分离重点实验室 北京碧水源科技股份有限公司 北京碧水源膜科技有限公司
出处 《中国给水排水》 CAS CSCD 北大核心 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)。
关键词 纳滤膜改性 rGO/ZIF-8 分盐性能 界面聚合 亲水性 modification of nanofiltration membrane rGO/ZIF-8 performance of separating salt interface polymerization hydrophilic property
分类号 TU375 [建筑科学—结构工程]
