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Photocatalytic decolorization of methylene blue over Zn1−xCoxO under visible light irradiation

✍ Scribed by Qi Xiao; Jiang Zhang; Chong Xiao; Xiaoke Tan

Book ID
104063715
Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
184 KB
Volume
142
Category
Article
ISSN
0921-5107

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✦ Synopsis

Co-doped ZnO photocatalysts were prepared by hydrothermal method. The obtained Co-doped ZnO powders were characterized by X-ray diffraction, UV-vis diffuse reflectance spectroscopy and photoluminescence (PL) spectra. The prepared Co-doped ZnO photocatalysts showed high photocatalytic activities for methylene blue decolorization at pH 10.5 under visible light irradiation. It was found that there were certain relationships between PL spectra and photocatalytic activity, namely, the stronger the PL intensity, the larger the content of oxygen vacancies and defects, the higher the photocatalytic activity. Therefore, in this study 3.0 mol% was the most suitable content of Co 2+ in ZnO, at which the recombination of photoinduced electrons and holes could be effectively inhibited and thereby the highest photocatalytic activity was formed.

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