Notice of RetractionThe Photocatalytic Degradation of Methylene Blue in Wastewater by Nano-Structured Cr-Doped TiO2 under Low Power Visible-Light Irradiation

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

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Through high-energy ball-milling technique, the nano structured TiO₂ photocatalysts with Cr-doped series (0.1 wt%, 1 wt%, 1.5 wt%, 5 wt%) were synthesized. XRD results show the materials are poly-crystal with average grain sizes 20 nm and mixed phase TiO₂ (the phase mole ratio of 80 % anatase to 20% rutile). Diffusion reflectance spectra show that Cr-doped to TiO₂ produces some red shift of energy band for adsorbing some visible light. 1 wt% Cr-doped TiOι is the largest red shift of energy band in the experiment samples. The photocatalytic degradation of MB (methylene blue) results also show that 1 wt% Cr-doped TiO₂ has the best properties under low power 40 watts office fluorescent light irradiation in the experiment samples due to the superiority condition of adsorbing the visible light. Hence, the nano-structured Cr-doped TiO₂ photocatalysts for visible light irradiation will be applied to the organic degradation in wastewater treatment.