Effect of calcination temperatures on microstructures and photocatalytic activity of tungsten trioxide hollow microspheres

Journal of Hazardous Materials
Jiaguo YuXiufeng Zhao

Abstract

Tungsten trioxide hollow microspheres were prepared by immersing SrWO4 microspheres in a concentrated HNO3 solution, and then calcined at different temperatures. The prepared tungsten oxide samples were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectra, differential thermal analysis-thermogravimetry, UV-visible spectrophotometry, scanning electron microscopy, N2 adsorption/desorption measurements. The photocatalytic activity of the samples was evaluated by photocatalytic decolorization of rhodamine B aqueous solution under visible-light irradiation. It was found that with increasing calcination temperatures, the average crystallite size and average pore size increased, on the contrary, Brunauer-Emmett-Teller-specific surface areas decreased. However, pore volume and porosity increased firstly, and then decreased. Increasing calcination temperatures resulted in the changes of surface morphology of hollow microspheres. The un-calcined and 300 degrees C-calcined samples showed higher photocatalytic activity than other samples. At 400 degrees C, the photocatalytic activity decreased greatly due to the decrease of specific surface areas. At 500 degrees C, the photocatalytic acti...Continue Reading

Citations

Jun 22, 2011·ACS Applied Materials & Interfaces·Maria TrapatseliEmmanuel Spanakis
Apr 30, 2010·Journal of Hazardous Materials·Xu Chun SongYao Yuan Zhang
May 21, 2015·Physical Chemistry Chemical Physics : PCCP·Guoqiang LiYingge Du

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