Abstract
Single nanocrystalline ZnWO 4 powders were successfully synthesized by ball milling at room temperature. A stoichiometric mixture of ZnO and WO 3 in a 1:1 molar ratio was subjected to intense mechanical treatment in air using a planetary ball mill (Fritsch – Premium line – Pulversette No. 7) for a period varying from 5 to 300 min. The influence of the four different milling conditions was investigated on the formation of ZnWO 4. The products obtained were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Brunauer–Emmer–Teller (BET) surface area, infrared (IR) spectroscopy and X-ray photoelectron spectroscopy (XPS). The synthesis of ZnWO 4 powder started after 5 min milling time and finished after 30 min milling time at a higher speed (1000 rpm). The mechanical treatment up to 300 min did not lead to phase and structure change of ZnWO 4. The product obtained contained nanoparticles with a size of about 50 nm. The photocatalytic activity of the ZnWO 4 powders obtained was investigated by degradation of a model aqueous solution of Malachite Green (MG) upon UV-light irradiation.
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