Unusual Photocatalytic Degradation Efficiency Of CdS/NiTiO_3/TiO_2 Ternary Composites: Structural Designing, Spectral Characterization And Photocatalytic Degradation Study

摘要

Anatase (TiO_2) is a predominant photocatalyst, it received attractive considerable attention on the removal of organic pollutants from wastewater. However, the main drawback of the relatively minimum photocatalytic efficiency, the high recombination rate of photoexcited electron-hole pairs and low utilization of visible light, resist its efficiency gradient at the composite boundary. This work reports, binary composite IMiTiO_3/TiO_2 first prepared through dispersion method. After CdS/NiTiO_3/TiO_2 ternary composites to build by the binary composites decorated with CdS nanomaterial. The modified ternary systems characterized by X-ray diffraction, for a study about crystalline phase; scanning electron microscopy (SEM) for surface morphology; UV diffused reflectance spectroscopy for the optical properties and photoluminescence spectra used to know the behaviour of photoexcitation of CdS/NiTiO_3/TiO_2 ternary composites. The CdS/NiTiO_3/TiO_2 ternary composites show superior degradation efficiency compared with CdS/TiO_2 and NiTiO_3/TiO_2 binary composites due to its better natural solar absorption and higher electron-hole charge separation. This composite has a greater potential on visible light driven photocatalytic activity for degrading organic dyes in wastewater effluents.