Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 519, Issue -, Pages 161-166Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.12.169
Keywords
Mechanochemical synthesis; ZnO; Optical properties; Photocatalytic activity
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Funding
- Ministry of Education and Science of Bulgaria
- National Science Fund of Bulgaria [TK-X-1702/07]
- National Centre for New Materials UNION [DO-02-82/2008]
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The nanocrystalline ZnO powders were obtained by mechanochemical treatment of zinc carbonate hydroxide. The mechanical activation was carried out in a planetary ball mill (Fritsch-Premium line-Pulversette No 7) by varying of the milling speed. The phase and structural transformation was investigated by X-ray diffraction (XRD) and infrared spectroscopy (IR). The morphology of the obtained ZnO powders was characterized by scanning electron microscopy (SEM). The crystallite size of the samples calculated from XRD and the SEM observation were in the range from 8 to 50 nm. The optical properties were investigated by UV-vis spectroscopy. The photocatalytic activity was studied with respect to the photodegradation of Malachite green (MG) under UV-light irradiation. The milling speed of 500 rpm led to full amorphization of the initial zinc carbonate hydroxide. After heat-treatment at 400 degrees C of X-ray amorphous sample single ZnO powder (20 nm) was obtained. The direct synthesis of ZnO nanoparticles (8 nm) was achieved at milling speed of 1000 rpm for short time (90 min). The mechanochemically synthesized ZnO powders possess good optical and photocatalytic properties. The additional heat-treatment improved the photocatalytic activity and the transparency of ZnO powders in the visible spectral range. (c) 2012 Elsevier B.V. All rights reserved.
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