Environmental catalysis and materials

Porous FeOx/BiVO4-δS0.08:Highly efficient photocatalysts for the degradation of Methylene Blue under visible-light illumination

Zhenxuan Zhao , Hongxing Dai , Jiguang Deng , Yuxi Liu , Yuan Wang , Xinwei Li , Guangmei Bai , Baozu Gao , Chak Tong Au


Received January 27, 2013,Revised March 04, 2013, Accepted , Available online October 10, 2013

Volume ,2013,Pages 2138-2149

Porous S-doped bismuth vanadate with an olive-like morphology and its supported iron oxide (y wt.% FeOx/BiVO4-δS0.08, y = 0.06, 0.76, and 1.40) photocatalysts were fabricated using the dodecylamine-assisted alcohol-hydrothermal and incipient wetness impregnation methods, respectively. It is shown that the y wt.% FeOx/BiVO4-δS0.08 photocatalysts contained a monoclinic scheetlite BiVO4 phase with a porous olive-like morphology, a surface area of 8.8-9.2 m2/g, and a bandgap energy of 2.38-2.42 eV. There was co-presence of surface Bi5+, Bi3+, V5+, V3+, Fe3+, and Fe2+ species in y wt.% FeOx/BiVO4-δS0.08. The 1.40 wt.% FeOx/BiVO4-δS0.08 sample performed the best for Methylene Blue degradation under visible-light illumination. The photocatalytic mechanism was also discussed. We believe that the sulfur and FeO_x co-doping, higher oxygen adspecies concentration, and lower bandgap energy were responsible for the excellent visible-light-driven catalytic activity of 1.40 wt.% FeOx/BiVO4-δS0.08.

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