Enhancing the Photocatalytic Activity of La/Y Co-Doped ZnWO_4 under UV Irradiation

摘要

In this paper, ZnWO_4: La~(3+), Y~(3+) photocatalysts were synthesized by a high-temperature solid state reaction method. The effects of La~(3+) and Y~(3+) doping contents on the phase, morphologies and optical properties of the samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Diffuse reflectance spectra (DRS), photoluminescence spectra (PL), Raman and UV-visible spectroscopy, respectively. The as-prepared ZnWO_4:La~(3+), Y~(3+) photocatalysts showed photoluminescence with a broad band emission, and high photocatalytic activity in degradation of rhodamine B (RhB) under simulated UV irradiation. The results showed that co-doping in ZnWO_4 can enhance light harvesting capability to generate more electron-hole pairs, and acted as a trap center by decreasing the recombination of photogenerated electrons and holes. All the results obtained by the work suggest that ZnWO_4: La~(3+), Y~(3+) photocatalysts are promising materials for the photocatalytic decomposition of pollutants.