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International Journal of Photoenergy
Volume 2008, Article ID 512170, 6 pages
http://dx.doi.org/10.1155/2008/512170
Research Article

Photocatalytic Degradation of Chlorobenzene by in High-Temperature and High-Pressure Water

Department of Applied Chemistry, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan

Received 28 August 2007; Accepted 7 December 2007

Academic Editor: M. Sabry Abdel-Mottaleb

Copyright © 2008 N. Kometani 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

A fluidized-bed-type flow reactor available for the photocatalytic treatment of the suspension of model soil under high-temperature, high-pressure conditions was designed. An aqueous suspension containing hydrogen peroxide ( ) as an oxidizer and inorganic oxides as a model soil, titania ( ), silica ( ), or kaoline ( ) was continuously fed into the reactor with the temperature and the pressure controlled to be and  = 30 MPa, respectively. The degradation of chlorobenzene (CB) in water was chosen as a model oxidation reaction. It appeared that most of the model soils are not so harmful to the SCWO treatment of CB in solutions. When the suspension containing was irradiated with near-UV light, the promotion of the degradation caused by photocatalytic actions of was observed at all temperatures. Persistence of the photocatalytic activity in the oxidation reaction in high-temperature, high-pressure water would open up a possibility of the development of the hybrid process based on the combination of SCWO process and photocatalysis for the treatment of environmental pollutants in soil and water, which are difficult to handle by conventional SCWO process or catalytic SCWO process alone.