Photocatalytic degradation of methylene blue using Ag-loaded BiVO4 catalyst under visible light irradiation

ENVR 196

Huaming Li, lihm@ujs.edu.cn1, Hui Xu2, Chundu Wu2, Jinyu Chu2, and Yongsheng Yan1. (1) College of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang, 212013, China, (2) College of Biological and Environmental Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang, 212013, China
The Ag-BiVO4 photocatalysts were prepared by silver fine particles deposited on BiVO4. The photocatalytic activities of Ag-BiVO4 were evaluated by N-demethylation of methylene blue (MB) under visible light irradiation. The MB degradation was examined to assess the influence of pH, the content of Ag loaded on BiVO4, initial concentration of MB and the dosage of catalysts. The results demonstrated that MB was effectively degraded by more than 95% within 3 h. It has been proven that the presence of Ag significantly enhanced the MB degradation under visible light irradiation and the optimal dosage of Ag loaded on BiVO4 was 3 wt.%. The results also showed that the kinetics of MB degradation followed a pseudo-first-order kinetic model. The UV-vis spectral analysis confirmed that hypsochromic effects resulting from N-demethylation of MB occurred concomitantly with oxidative degradation.
 

General Papers
6:00 PM-8:00 PM, Wednesday, 13 September 2006 Moscone Center -- Hall D, Poster

Division of Environmental Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006