Preparation and Property of PVDF Ultrafiltration Membrane Modified by Graphene

摘要

In order to improve the hydrophilicity and mechanical strength of the membrane, the modified PVDF ultrafiltration membranes were prepared by the phase inversion method with different contents of nano graphene dispersed uniformly in the PVDF casting solution. In the experiment, the effect of graphene on the separation performance, contact angle, zeta potential and tensile strength of the membranes were investigated, and the flux recovery rate and flux decline rate were also investigated. The crystal structure of the membranes were characterized by X ray diffraction (XRD) and thermal analysis (DSC). The results showed that the performance of pore size, porosity and pure water flux of the modified membranes were improved. The tensile strength, hydrophilic and anti-fouling properties of the membranes were also improved. The separation performance, hydrophilic and anti-fouling properties of the modified membranes were the best when the addition content of graphene was 0.5%. Graphene had no effect on the crystallinity of the membranes, and XRD found that the graphene in the casting solution was physical blend.