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Journal of Materials Science

, Volume 47, Issue 5, pp 2155–2161 | Cite as

Visible light-activated cadmium-doped ZnO nanostructured photocatalyst for the treatment of methylene blue dye

  • Dongfang Zhang
  • Fanbin Zeng
Article

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.

Keywords

Methylene Blue Photocatalytic Activity Catalyst Loading Color Removal Photocatalytic Efficiency 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.College of ScienceHuazhong Agricultural UniversityWuhanPeople’s Republic of China

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