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International Journal of Photoenergy
Volume 2013, Article ID 890240, 6 pages
http://dx.doi.org/10.1155/2013/890240
Research Article

Photocatalytic Oxidation of Gaseous Benzene under 185 nm UV Irradiation

1School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China
2Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China
3Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong

Received 19 July 2013; Accepted 11 August 2013

Academic Editor: Guisheng Li

Copyright © 2013 Haibao Huang 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

Benzene is a toxic air pollutant and causes great harm to human being. Photocatalytic oxidation (PCO) has been frequently studied for benzene removal, however, its PCO efficiency is still very low and the photocatalysts are easy to be deactivated. To improve the efficiency and stability of PCO, UV lamps with partial 185 nm UV irradiation were used to activate photocatalysts (denoted as 185-PCO). Cobalt modified TiO2 (Co-TiO2) was developed to improve the PCO activity and eliminate ozone generated from 185 nm UV irradiation. Results show that benzene removal efficiency of PCO with 254 nm UV irradiation (denoted as 254-PCO) is only 2.1% while it was greatly increased to 51.5% in 185-PCO. 185-PCO exhibited superior capacity for benzene oxidation. In the 185-PCO process, much ozone was left in case of TiO2 as photocatalysts while it can be nearly eliminated by 1% Co-TiO2.