Bi2O3, BiVO4, and Bi2WO6: Impact of Surface Properties on Photocatalytic Activity under Visible Light

By T. Saison, N. Chemin, C. Chanéac, O. Durupthy, V. Ruaux, L. Mariey, F. Maugé, P. Beaunier, J. Jolivet. 2011

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Bismuth-based oxides have attractive photocatalytic properties under visible light. A better understanding of the origin of that good photocatalytic activity should allow its control and its optimization. In this Article, we have studied the impact of surface properties on photocatalytic activity for three bismuth-based oxides Bi2O3, BiVO4, and Bi2WO6. The surface acidity of particles was investigated by pyridine adsorption using infrared spectroscopy and the photocatalytic activity was investigated by the degradation of an aqueous solution of rhodamine B (RhB) and of stearic acid deposited on films under visible light. From the results obtained for the three bismuth-based oxides, we established a relation between surface acidity and photocatalytic mechanism of RhB degradation. The best photocatalytic efficiency for RhB and stearic acid degradation has been obtained with Bi2WO6 that also exhibits the highest surface acidity. The most acid sites promote a strong interaction with the pollutant, implying a s...

Subfields: Electrical and Electronic Engineering, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/4b635b4566f5ac97f6306f69958ffce01b8adcd2