Synthesis and photocatalytic performance of novel CdS quantum dots sensitized Bi2WO6 photocatalysts

Novel quantum dots sensitized CdS-Bi2WO6 composite photocatalysts were synthesized to improve the visible-light-driven photocatalytic performance. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) UV-vis diffuse reflectance spectra (DRS). The photocatalytic activities of QDs sensitized CdS-Bi2WO6 samples were investigated based on the decomposition of methyl orange under visible light irradiation (λ > 420 nm). The DRS results revealed that CdS-Bi2WO6 samples have a red shift and stronger absorption in the visible light region. After being sensitized by quantum dots CdS, the Bi2WO6 samples showed the high efficiency for the degradation of methyl orange. This study may provide an approach to treatment of organic pollutants by using visible light.