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International Journal of Photoenergy
Volume 2014, Article ID 425836, 8 pages
http://dx.doi.org/10.1155/2014/425836
Research Article

Enhanced Transformation of Atrazine by High Efficient Visible Light-Driven N, S-Codoped TiO2 Nanowires Photocatalysts

1School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China
2Key Laboratory of Theoretical Chemistry of Environment Ministry of Education, South China Normal University, Guangzhou 510006, China
3Guangdong Technology Research Center for Ecological Management and Remediation of Urban Water System, School of Chemistry & Environment, South China Normal University, Guangzhou 510006, China

Received 15 July 2014; Accepted 17 September 2014; Published 19 October 2014

Academic Editor: Hongtao Yu

Copyright © 2014 Yanlin Zhang 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.

Abstract

Advanced oxidation process using titanium dioxide as a photocatalyst under solar irradiation is one of the most attractive technologies to eliminate atrazine, an endocrine disrupting and carcinogen contaminant. The N, S-codoped TiO2 nanowires at the calcination of 600°C obtained by a facile hydrothermal method revealed the best photocatalytic performance for the degradation of atrazine under visible light irradiation compared to N, S-codoped TiO2 nanoparticles and S-doped TiO2 nanowires. TOC removal experiment also exhibited the similar result and achieved 63% of atrazine mineralization within 6 h. The degradation of atrazine was driven mainly by OH and holes during the photocatalytic process. Reactive species quantities such OH and generated by N, S-codoped TiO2 nanowires under visible light irradiation were much more than those of S-doped TiO2 nanowires and N, S-codoped TiO2 nanoparticles. These results were mainly attributed to the synergistic effect of N and S doping in narrowing the band gap, remarkable increase in electron-hole separation, extending the anatase-to-rutile transformation temperature above 600°C, and preferentially exposing high reactive crystal facets of anatase.