磺化氧化石墨烯/聚砜复合膜的制备及抗污染性能

采用浸没沉淀-相转化法制备了磺化氧化石墨烯/聚砜（SGO/PSf）复合膜，对SGO/PSf复合膜的亲水性、纯水通量、孔隙率、表面Zeta电位、膜断面和表面形貌进行测定。为了分析SGO/PSf复合膜的抗污染性能，采用自制牛血清白蛋白（BSA）探针，借助原子力显微镜（AFM）测定了SGO/PSf复合膜与BSA之间的黏附力。结果表明，由于SGO与聚乙烯吡咯烷酮（PVP）的协同作用，SGO含量为0.5wt%的SGO/PSf复合膜的表面自由能最大（114.47 mJ/m2），亲水性最好，对BSA的截留率为97.5%，污染恢复率达到80.06%。BSA与SGO含量为0.5wt%的SGO/PSf复合膜之间的黏附力最小（-0.61 mN/m），说明SGO含量为0.5wt%的SGO/PSf复合膜的抗污染能力最强。 

Preparation and antifouling property of sulfonated graphene oxide/ polysulfone composite membrane

The sulfonated graphene oxide/polysulfone (SGO/PSf) composite membranes were prepared by immersion precipitation-phase inversion method. The hydrophilicity, water flux, porosity, surface Zeta potential, membrane cross section and surface morphology of SGO/PSf composite membranes were measured in detail. In order to analysis the antifouling of membranes, the adhesion forces between SGO/PSf composite membranes and bovine serum albumin (BSA) were measured by atomic force microscopy (AFM) with self-made BSA probes. The experimental results show that the SGO/PSf composite membrane with 0.50wt% SGO has the largest surface free energy (114.47 mJ/m2) and the best hydrophilicity, due to the synergistic effect of SGO and polyvinylpyrrolidone (PVP). The rejection rate of SGO/PSf composite membrane to BSA is 97.5%, and the fouling recovery rate is 80.06%. The adhesion force between BSA and membrane is the least (-0.61 mN/m), which illustrates that the antifouling ability of the SGO/PSf composite membrane with 0.50wt% SGO is the best.