Ag2CO3@UiO-66-NH2 embedding graphene oxide sheets photocatalytic membrane for enhancing the removal performance of Cr(VI) and dyes based on filtration

A novel photocatalytic membrane was prepared by using graphene oxide (GO), UiO-66-NH2 and Ag2CO3 as basic materials on the surface of PVDF membrane by vacuum filtration self-assembly. The prepared Ag2CO3 @UiO-66-NH2/GO (AgCO@UiO/GO) membrane was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The AgCO@UiO/GO membrane possessed the photocatalytic effects, which significantly enhanced the separation effect of dyes and Cr(VI) wastewater. In particular, the AgCO@UiO/GO membrane can achieve complete removal of MB, RB,MR and Cr(VI) under light conditions maintaining the fluxes during filtration process reach about 50 L . m(-2).h(-2). In addition, after long-time experiments, the AgCO@UiO/ GO membrane retained a higher removal rate and maintained a high flux under light conditions than without light for all dyes and Cr(VI). The unique structure of AgCO@UiO/GO membrane with a large number of screening structures and photocatalytic activity resulting a better removal rate for pollutants and reducing membrane fouling. Furthermore, the AgCO@UiO/GO membrane shows a great potential in improving membrane removal performance and a solution to balance trade-off effect.