Author(s): CHEN Ran, HU Chao-hao, ZHAO Wen, WEI Shuai, CUI Jian, ZHONG Yan, ZHOU Huai-ying
Pages: 476-483
Year: 2014 Issue:  2
Journal: The Chinese Journal of Nonferrous Metals
Keyword:  Bi2WO6 photocatalyst; hydrothermal synthesis; Rhodamine B; visible light; photocatalytic activity;
Abstract: Spherical Bi2WO6 photocatalysts were synthesized by hydrothermal method with different hydrothermal temperature and reaction time using Bi(NO)3?5H2O and Na2WO4?2H2O as raw materials, which were further characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-Vis diffusion reflectance spectra techniques. The photocatalytic activity of Bi2WO6 photocatalysts was evaluated by degrading Rhodamine B (RhB, 5 mg/L) under ultraviolet and visible light irradiation (λ>420 nm). The influence of dosage of catalyst, initial concentration of RhB and light source on degradation rate was also investigated. The results indicate that 180 ℃ and 7 h are the proper conditions for preparing Bi2WO6 powders. When the dosage of Bi2WO6 catalyst is 2 g/L and the ultraviolet irradiate time is 120 min, the degradation rate of RhB is up to 99.8%.