氧化石墨烯/聚偏氟乙烯复合膜的制备及抗污染性能  

Modification of polyvinylidene fluoride composite membrane by graphene oxide and its antifouling properties

作　　者：霍霄楠 王磊[1,2] 朱振亚[1,2,3,4] 姜家良[1,2] 李青青[1,2] 徐亚伟[1,2] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055 [2]西安建筑科技大学陕西省膜分离重点实验室,西安710055 [3]河北地质大学水资源与环境学院,石家庄050031 [4]河北省水资源可持续利用与开发重点实验室,石家庄050031

出　　处：《环境工程学报》2017年第9期4923-4931,共9页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51278408);陕西省青年科技新星项目(2014KJXX-65);西安建筑科技大学创新团队计划项目

摘　　要：采用改进的Hummers法制备出具有"二维结构"的氧化石墨烯(graphene oxide,GO),以聚偏氟乙烯(PVDF)为高分子聚合物,聚乙烯吡咯烷酮(PVP)为制孔剂,采用浸没沉淀相转化法制备得到GO/PVP/PVDF复合超滤膜。测定了复合超滤膜的纯水通量、接触角、污染物截留、膜片SEM和AFM图像、膜面Zeta电位以及复合膜与牛血清蛋白(BSA)之间的微观作用力等参数。结果表明,随着GO含量的增加,膜表面亲水性官能团的含量显著增加,复合膜的接触角从74.61°(M0)减小到66.39°(M2),纯水通量增加了33%;SEM和AFM的结果表明,复合膜的膜孔有所拓宽,表面粗糙度由23.79(M0)降低为20.2(M3),表面更加平滑。而GO的加入使得复合膜与BSA之间的微观作用力也从2.47 m N·m-1降至0.13 m N·m-1,说明GO/PVP/PVDF复合超滤膜较传统PVDF超滤膜具有较优越的抗污染性能。The graphene oxide（GO） with two-dimensional structure was prepared through a modified Hummers＇ method. GO/PVP/PVDF composite ulrrafiltration（UF） membrane were prepared with polyvinylidene fluoride（PVDF）,polyvinylpyrrolidone（PVP） and GO by general phase inversion method. The pure water flux,contact angle,pollutant rejection,SEM and AFM images,Zeta potential and interaction force between composite membrane and BSA were measured. Results show that with the increase of GO in the composite membrane,the content of hydrophilic functional groups in the composite membrane surface effectively increased,contact angle decreased from 74. 61°（M0） to 66. 39°（M2）,while pure water flux increased by 33%. The image analyses by scanning electron microscopy（SEM） and atomic force microscopy（AFM） exhibited that the finger-like pores of the GO/PVP/PVDF membrane were broadened and surface roughness reduced from 23. 79（M0） to 20. 2（M3）with a smoother surface. Moreover,with the introducing of GO,the interaction force between composite membrane and BSA changed from 2. 47 mN·m^-1to 0. 13 mN·m^-1. The results testify that GO/PVP/PVDF composite UF membrane has a superior antifouling propensities compared to traditional PVDF UF membrane.

关 键 词：氧化石墨烯 聚偏氟乙烯(PVDF) 复合超滤膜 微观作用力 膜污染 

分 类 号：X522[环境科学与工程—环境工程]