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

作　　者：陈俣良 巴立波 刘一江 吴玉梁 李月影 陈贤达 衣雪松 CHEN Yuliang;BA Libo;LIU Yijiang;WU Yuliang;LI Yueying;CHEN Xianda;YI Xuesong(School of Ecology and Environment,Hainan University,Haikou 570228,China;Haikou Haoyuan Testing Technology Co.,Ltd.,Haikou 570208,China)

机构地区：[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

出　　处：《净水技术》2024年第7期69-75,82,共8页Water Purification Technology

基　　金：国家自然科学基金项目(52360002);海南省重点研究项目(YF2021GXJS026)。

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/(m^(2)·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Na_(2)SO_(4)和MgSO_(4)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。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 theα-phase to theβ-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 Na_(2)SO_(4) and MgSO_(4) 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 

分 类 号：X703[环境科学与工程—环境工程]