SPTA−PVA/CDA−GO/PVDF复合膜的制备与表征  

Preparation and characterization of SPTA−PVA/CDA−GO/PVDF composite membrane

作　　者：徐悦[1] 曾正 袁海宽 陆杰 XU Yue;ZENG Zheng;YUAN Haikuan;LU Jie(School of Chemistry and Chemical Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]上海工程技术大学化学化工学院,上海201620

出　　处：《上海工程技术大学学报》2022年第4期341-346,共6页Journal of Shanghai University of Engineering Science

摘　　要：用1,4−环己二胺(CDA)修饰氧化石墨烯(GO),利用4−磺基邻苯二甲酸(SPTA)对聚乙烯醇(PVA)进行交联,以亲水化的聚偏氟乙烯(PVDF)超滤膜为底膜,通过真空过滤与滴涂,制备SPTA−PVA/CDA−GO/PVDF复合膜.采用全反射傅里叶变换红外光谱(ATR−FTIR)、扫描电子显微镜(SEM)和接触角测试对复合膜表征,并测试复合膜的渗透汽化脱盐性能.结果表明,CDA修饰扩大了GO纳米片的层间距,增加了CDA−GO层的透水性;交联PVA层提高了复合膜的表面亲水性和稳定性,增强了复合膜吸水性和水传输性能.复合膜在70℃对质量分数为3.5%的氯化钠(NaCl)水溶液获得15.6 kg/(m^(2)•h)的水通量和99.99%的脱盐率.Graphene oxide(GO)was modified by 1,4−cyclohexanediamine(CDA),and polyvinyl alcohol(PVA)was crosslinked by 4−sulfophthalic acid(SPTA).Hydrophilized polyvinylidene fluoride(PVDF)ultrafiltration membrane as support,SPTA−PVA/CDA−GO/PVDF composite membrane was prepared through vacuum filtration and drop coating.The composite membrane was characterized by ATR−FTIR,SEM and contact angle,and the pervaporation desalination performance of composite membrane was tested.The results show that the modification of CDA extended the interlayer spacing of GO nanosheets,thus improving the water permeability of CDA−GO layer,and the crosslinked PVA layer enhanced the surface hydrophilicity and stability of composite membrane,consequently,improved the water absorption and water transport properties of composite membrane.The composite membrane obtained a flux of 15.6 kg/(m^(2)•h)and a rejection of 99.99%when treating with concentration of 3.5%NaCl solution at 70℃.

关 键 词：渗透汽化 脱盐 氧化石墨烯 聚乙烯醇 

分 类 号：TQ028.8[化学工程]