CFGO@PVDF复合纳滤膜的结构调控及截留性能
Structure Control and Interception Performance for Composite NF Membrane of CFGO@PVDF
陈俣良 1巴立波 1刘一江 1吴玉梁 1李月影 2陈贤达 2衣雪松1
作者信息
- 1. 海南大学生态与环境学院,海南海口 570228
- 2. 海口皓源检测技术有限公司,海南海口 570208
- 折叠
摘要
以聚偏氟乙烯(PVDF)和羧基化氧化石墨烯(CFGO)为原料,制备了高亲水性和高脱盐效能的CFGO@PVDF复合纳滤膜(GONF膜),通过优化制备条件,结合微观结构及形貌表征,获得了GONF膜的最佳制备条件,实现了复合纳滤膜性能的显著提升.结果表明,与传统PVDF纳滤膜(CNF膜)相比,CFGO@PVDF复合纳滤膜展现了更深的孔通道和显著提高的亲水性,其纯水通量可达 13.1 L/(m2·h·bar)(1 bar=100 kPa),是CNF膜的2.5 倍以上.此外,GONF膜的晶型实现了由α相向β相转化,膜表面的含氧官能团含量增加,大幅提升了对 2 g/L不同盐溶液的截留率,其中对Na2SO4 和MgSO4 的截留率分别高达 96%和 95%以上,且 60 min内未发生明显衰减.研究成功研制了一种高水通量、高效稳定脱盐的CFGO@PVDF复合纳滤膜,为纳滤膜的设计与制备提供了新的思路,也为解决全球水处理问题提供了有效的技术思路.
Abstract
By using polyvinylidene fluoride(PVDF)and carboxylated graphene oxide(CFGO)as raw materials,a highly hydrophilic and efficient desalination CFGO@PVDF composite nanofiltration membrane(GONF)was fabricated.By optimizing the preparation conditions and combining microscopic structure and morphology characterization,the optimal fabrication conditions for the GONF membrane were obtained,achieving a significant improvement in the performance of the composite nanofiltration membrane.The results showed that,compared to traditional PVDF nanofiltration membranes(CNF),the CFGO@PVDF composite nanofiltration membrane exhibited deeper pore channels and significantly enhanced hydrophilicity,with a pure water flux reaching 13.1 L/(m 2·h·bar)(1 bar=100 kPa),which was 2.5 times that of the CNF membrane.Additionally,the crystalline phase of the GONF membrane had been transformed from the α-phase to the β-phase,and the content of oxygen-containing functional groups on the membrane surface had increased,significantly enhancing the retention rate for different 2 g/L salt solutions,with the retention rates for Na2SO4 and MgSO4 being higher than 96％and 95％,respectively,without significant degradation within 60 minutes.This study successfully developed a high-water-flux,efficient and stable desalination CFGO@PVDF composite nanofiltration membrane,providing new insights into the design and fabrication of nanofiltration membranes,as well as offering an effective technical approach to solving global water treatment issues.
关键词
聚偏氟乙烯(PVDF)/羧基化氧化石墨烯(CFGO)/亲水性/海水淡化/结构调控Key words
polyvinylidene fluoride(PVDF)/carboxylated graphene oxide(CFGO)/hydrophilicity/seawater desalination/structure control引用本文复制引用
基金项目
国家自然科学基金项目(52360002)
海南省重点研究项目(YF2021GXJS026)
出版年
2024
国家科技期刊平台
NSTL
万方数据