Characteristics of photocatalytic membrane loaded with ZnIn2S4 and its degradation performance of fluvastatin

Abstract:

To overcome the problem caused by the separation photocatalysts from system in the traditional photocatalytic technology, the photocatalytic membrane was prepared by filtrating suspended ZnIn₂S₄ on the surface of ultrafiltration membrane and was characterized by SEM, UV-Vis, XPS, XRD, and the ultrafiltration performance was also analyzed. The degradation rate of fluvastatin by photocatalytic membranes was investigated under a 500 W xenon lamp with intensity of 230 W/m². With the increase of the photocatalyst loading, the absorbance of photocatalytic membrane in ultraviolet and visible light region increased, the characteristic peak response of Zn, In and S elements increased, the diffraction peak of ZnIn₂S₄ with hexagonal phase increased and the hydrophilicity increased, which indicated that formation of photocatalytic coating layer on the surface. The degradation rate of fluvastatin was also enhanced by formation of photocatalytic coating layer. However, agglomeration of excess ZnIn₂S₄ on the surface of the membrane leaded to reducing the utilization rate of the photocatalyst and affeced the photocatalytic efficiency. The photocatalytic coating layer of photocatalytic membrane with 0.2 g ZnIn₂S₄ could be effectively excited by xenon lamp and the degradation rate of fluvastatin was 94.75%.