Abstract
Nanosized bismuth tungsten oxide, Bi 2WO 6, has been successfully synthesized by a microwave hydrothermal approach for the first time, using Bi(NO 3) 3, NH 3 and H 2WO 4 as the starting materials. The influences of the reaction conditions (including starting materials, concentration, reaction temperature, and holding time) on the phases and morphologies of the products are investigated by X-ray diffraction and transmission electron microscopy. The best conditions for the synthesis are provided. Transmission electron microscopic results reveal that the as-prepared particles are sheet-shaped. The experiments show that the microwave hydrothermal approach is a satisfactory method for the synthesis of the Bi 2WO 6 nanocrystals. Meanwhile, the photocatalytic activity of Bi 2WO 6 nanoplates for the degradation of methylene blue under visible light irradiation ( λ > 400 nm) is much higher than that of samples prepared by the solid-state reaction.
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