Structure and photocatalytic activity of bismuth tungstate nanoparticles synthesized by one-step solvothermal method


Zhang, Xianghui

Abstract

Bi2WO6 has been synthesized by water, methanol or ethylene glycol assisted solvothermal method. The physical and photophysical properties of the as-prepared samples are characterized by XRD, UV-vis, SEM and BET surface area measurements. XRD results show orthorhombic Bi2WO6 with the average crystallite size of about 9.2 nm, obtained using ethylene glycol as the reaction solvent. By substituting ethylene glycol for deionized water or methanol as solvent, the size of Bi2WO6 increases. BET results indicate that the Bi2WO6 sample prepared in ethylene glycol has the largest surface area (56.5 m2 g–1). The photocatalytic activities of as-prepared samples have been evaluated by the degradation of methylene blue in an aqueous solution under visible light irradiation. The degradation ratio of MB over Bi2WO6 synthesized in ethylene glycol (97.1%) is much higher than that over Bi2WO6 synthesized in deionized water (82.8%) and methanol (50.0%) within 120 min. This may be attributed to its appropriate energy band structure, small crystallite size, and high surface area.


Keyword(s)

Bismuth tungstate, Ethylene glycol, Methylene blue, Dye degradation, Solvothermal method


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