氧化石墨烯掺杂磺化芳香嵌段聚合物制备高性能渗透汽化脱盐膜  

Preparation of high-performance pervaporation desalination membranes by doping sulfonated aromatic block copolymers with graphene oxide

作　　者：延檬羽 申伟煜 王子恒 张世茂 李娜[1] YAN Mengyu;SHEN Weiyu;WANG Ziheng;ZHANG Shimao;LI Na(School of Chemical Engineering and Technology,Xi¢an Jiaotong University,Xi¢an 710049,China)

机构地区：[1]西安交通大学化学工程与技术学院,陕西西安710049

出　　处：《高校化学工程学报》2023年第6期897-905,共9页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(2176210);陕西省自然科学基础研究计划企业联合基金(2019JLM-23)。

摘　　要：渗透汽化在浓盐水脱盐处理方面具有独特优势,磺化芳香嵌段聚合物(SAP)具有微相分离结构,可为透水脱盐过程提供有利于水分子传输的离子型纳米通道。为进一步提高SAP膜的分离性能,同时改善机械强度,以亲水聚四氟乙烯(PTFE)多孔膜为基底,以新型高磺化聚苯乙烯接枝型SEBS(S-SEBS-g-PSt)为高分子基质,以二维材料氧化石墨烯(GO)为无机填充剂,制备出高性能SAP-GO/PTFE混合基质膜。结果表明,石墨烯掺杂改性显著提高SAP膜的亲水性、机械强度和抗溶胀性,当GO质量分数达到1%时,在80℃处理质量分数为10%的NaCl浓水时,SAP-GO-1/PTFE混合基质膜水通量达到91.8 kg·(m^(2)·h)^(-1),截盐率超过99.96%,展现出良好的应用潜力。Pervaporation desalination has advantages in treating high saline brine.Sulfonated aromatic polymer(SAP)features micro-phase separation structures and ionic nano-channels that make it a potential membrane material for desalination.In order to improve the separation performance of SAP membrane while maintaining great mechanical strength,SAP-GO/PTFE mixed matrix membranes(MMMs)were prepared with hydrophilic polytetrafluoroethylene(PTFE)porous film as the support,a synthesized SAP sulfonated polystyrene-grafted SEBS(S-SEBS-g-PSt)as the polymer matrix and two-dimensional graphene oxide(GO)as the inorganic fillers.The results show that GO doping significantly improves hydrophilicity,mechanical strength and dimensional stability of SAP membranes.When GO loading reached 1%,a high flux of 91.8 kg·(m^(2)·h)^(-1)and a salt rejection over 99.96%were achieved for 10%NaCl solution treatment at 80℃,which demonstrates the great potential in industrial applications.

关 键 词：磺化芳香聚合物 氧化石墨烯 掺杂改性 渗透汽化脱盐 

分 类 号：TQ465.92[化学工程—制药化工]