层层自组装磺化石墨烯纳滤膜的制备及表征  

Preparation and Characterization of Layered Self-assembled Sulfonated Graphene Nanofiltration Membranes

作　　者：王蕊 周易 邵文尧[1] WANG Rui;ZHOU Yi;SHAO Wenyao(College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China)

机构地区：[1]厦门大学化学化工学院,福建厦门361005

出　　处：《化工技术与开发》2022年第10期5-9,共5页Technology & Development of Chemical Industry

基　　金：厦门市科技计划项目(3502Z20183016)。

摘　　要：以聚醚砜超滤膜为基膜,聚乙烯亚胺(PEI)为阳离子添加剂,与磺化石墨烯(SG)混合后,采用层层自组装技术制备了纳滤膜。磺化石墨烯具有优于普通石墨烯的分散性,聚乙烯亚胺可提供氨基,两者结合有利于堆叠成膜。通过实验,系统考察了聚乙烯亚胺浓度、磺化石墨烯浓度等制膜条件对膜性能的影响。结果表明,随着聚乙烯亚胺和磺化石墨烯的浓度增加,水通量先增加后减小,截留率先减小后增加。得到的最佳制膜条件为:磺化石墨烯浓度为0.2 mg·mL^(-1),聚乙烯亚胺浓度为0.05%,此时膜的水通量为8.5L·(m^(2)·h)^(-1),截留率为99.15%。通过扫描电子显微镜、红外光谱、接触角等,对膜的表面形态、化学组成、疏水性进行了表征。结果表明,磺化石墨烯与聚乙烯亚胺共同影响膜的性能,其亲水基团和堆叠在膜表面形成的致密膜层,对膜的性能相互影响,在某特定浓度时达到最佳。Polyethersulfone ultrafiltration membrane was used as base membrane,polyethyleneimine was used as cationic additive,and sulfonated graphene was mixed with them.The nanofiltration membrane was prepared by layer self-assembly technique.The sulfonated graphene was superior to ordinary graphene in dispersity.Polyimide provided amino groups,and the combination of them was beneficial to the stacking of films.At the same time,the effects of membrane preparation conditions on membrane properties were systematically investigated.With the increase of PEI and SG concentration,the water flux increased first and then decreased,and the interception decreased first and then increased.The optimum conditions of membrane preparation were obtained by the restriction of various factors:the SG concentration was 0.2mg/mL and the PEI concentration was 0.05%.Under these conditions,the water flux of the membrane was 8.5 L/m^(2)·h.The rejection rate was 99.15%.The surface morphology,chemical composition and hydrophobicity of the films were characterized by scanning electron microscope,infrared spectroscopy and contact angle.The results showed that SG and PEI affected the properties of the films.The hydrophilic group and the dense film layer formed on the surface of the membrane by adding them influenced the performance of the film,while the best was achieved at a certain concentration.

关 键 词：层层自组装 纳滤膜 磺化石墨烯 聚乙烯亚胺 

分 类 号：TQ028.8[化学工程]