Table of Contents
Journal of Catalysts
Volume 2014 (2014), Article ID 962419, 7 pages
Research Article

Visible Light Induced Photocatalytic Degradation of Methyl Red with Codoped Titania

1Department of Inorganic & Analytical Chemistry, School of Chemistry, Andhra University, Visakhapatnam 500 003, India
2Department of Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500 007, India

Received 15 June 2014; Revised 15 September 2014; Accepted 29 September 2014; Published 20 October 2014

Academic Editor: Adel A. Ismail

Copyright © 2014 Susmitha Thota et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Photocatalysis using semiconductor oxides was being investigated extensively for the degradation of dyes in effluent water. This paper reports our findings on visible light induced photocatalytic degradation of azo dye, methyl red mediated nitrogen and manganese codoped nano-titanium dioxide (N/Mn-TiO2). The codoped samples with varying weight percentages were synthesized by sol-gel method and characterized by various analytical techniques. The X-ray diffraction data showed that the synthesized samples were in anatase phase with 2 at 25.3°. UV-visible diffuse reflectance spectral analysis revealed that the presence of dopants in TiO2 caused a significant absorption shift towards visible region and their presence was confirmed by X-ray photoelectron spectral data. The release of hydroxyl radical (major active species in photocatalytic degradation) by the photocatalyst in aqueous solution under visible light irradiation was quantitatively investigated by the photoluminiscent technique (PL). The effect of various experimental parameters like dopant concentration, pH, catalyst dosage, and initial dye concentrations was investigated and optimum conditions were established. The extent of mineralization of methyl red was studied by chemical oxygen demand (COD) assays and the results showed complete mineralization of the dye.