Abstract
Cd1−xZnxS-sensitized K2Ti4O9 composite photocatalysts (hereafter designated as Cd1−xZnxS/K2Ti4O9) were prepared by a facile deposition–precipitation method. The samples were characterized by X-ray fluorescence spectrometry (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), ultraviolet–visible diffuse reflectance spectra (UV–vis DRS), X-ray photoelectron spectroscopy (XPS), and photoluminescence spectroscopy (PL). The photocatalytic activities for degradation of Rhodamine B (RhB) were investigated under visible light irradiation. The Cd0.8Zn0.2S particles, which were scattered on the surface of K2Ti4O9, had a relatively uniform size distribution centered around approximately 50nm, and the absorption edge of K2Ti4O9 was shifted to the visible light region after the deposition of Cd0.8Zn0.2S. The Cd0.8Zn0.2S crystal was found to be hexagonal and the K2Ti4O9 crystal monoclinic in the composite photocatalysts. Cd0.8Zn0.2S/K2Ti4O9 showed lower PL peak intensity than K2Ti4O9. The composite photocatalyst loaded with 30wt.% Cd0.8Zn0.2S exhibited the highest photo-catalytic activity, and was able to degrade 95% of RhB in 180min. The photocatalytic reaction parameters, such as initial RhB concentration, photocatalyst dosage and initial solution pH were studied. The mechanism of separation of the photo-generated electrons and holes in the Cd0.8Zn0.2S/K2Ti4O9 composite was also discussed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.