LI Jiake, LIU Xin, CHENG Kai, ZHAO Xueguo, HUANG Liqun, WANG Yanxiang
(School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China)
Abstract:BiVO4 ultrafine powder was prepared by solution combustion method using Bi(NO3)3·5H2O, NH4VO3 and C12H22O11 as raw materials. The effects of igniting temperature on phase composition, microstructure and photocatalytic performance of the synthesized powder were studied by means of XRD, SEM and spectrophotometer. The results show that at low igniting temperatures (300 ℃ and 400 ℃), the as-synthesized BiVO4 consists of monoclinic and tetragonal phases, and at higher igniting temperatures (500 ℃ and 600 ℃), BiVO4 consists of monoclinic phase. Photocatalytic results show that BiVO4 synthesized at the igniting temperature of 500 ℃owns the best photocatalytic performance, and the photodegradation efficiency of methylene blue (10 mg/L) reaches 55.7% under high pressure mercury lamp irradiation for 240 min, and the photocatalytic reactions accord with the first order kinetics equation.
Key words:solution combustion method; igniting temperature; phase composition; photocatalytic performance