Visible light-activated cadmium-doped ZnO nanostructured photocatalyst for the treatment of methylene blue dye |
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Authors: | Dongfang Zhang Fanbin Zeng |
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Affiliation: | (1) College of Science, Huazhong Agricultural University, Wuhan, 430070, People’s Republic of China |
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Abstract: | An attempt was made to prepare Cd-doped ZnO photocatalyst for visible light assisted degradation of a textile dye (methylene
blue, MB) in aqueous solutions by a traditional sol–gel process. The as-prepared nanoparticles were characterized by X-ray
diffraction, UV–vis diffuse reflectance spectroscopy, and photoluminescence spectra techniques. The results showed that the
Cd-doped ZnO possess the single-phase hexagonal wurtzite structure. The photocatalytic activity of the nanoparticles under
visible light was investigated by measuring the photodegradation of MB in aqueous dispersion. The effects of key operation
parameters such as initial dye concentration, catalyst loading as well as initial pH value on the decolorization extents were
investigated. The results indicate that the decolorization of the organic molecule followed a pseudo-first-order kinetics
according to the Langmuir–Hinshelwood model. Under the optimum operation conditions, approximately 85.0% dye removal was achieved
within 3.5 h. |
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