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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received August 20, 2002
Accepted October 7, 2002

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Deactivation and Regeneration of Titania Catalyst Supported on Glass Fiber in the Photocatalytic Degradation of Toluene

Young San You Kyeong-Hwan Chung Young Man Kim¹ Jong-Ho Kim Gon Seo^†

Department of Chemical Technology and the Research Institute for Catalysis, Chonnam National University, Gwangju 500-757, Korea ¹Advanced Analysis Center, Korea Institute of Science and Technology,, P.O. Box 131, Cheongryangri, Seoul 130-650, Korea

gseo@chonnam.ac.kr

Korean Journal of Chemical Engineering, January 2003, 20(1), 58-64(7), 10.1007/BF02697185

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Abstract

Two titania photocatalysts supported on glass fiber (GF) were prepared by using anatase-type crystalline P25 powder and dilute titanium isopropoxide solution (DTS). Chemical compositions and characteristics of the surface of the P25/GF and DTS/GF catalysts were examined with an XPS method, and their activities in the photocatalytic degradation of toluene under UV irradiation were discussed. Although a large amount of titania was stably impregnated on glass fiber on the DTS/GF catalyst, low-temperature calcination brought about insufficient oxidation of titanium atoms resulting in a heavy deposit of carbonaceous materials. Both catalysts (P25/GF and DTS/GF) were active in photocatalytic degradation, while their catalytic activity was lowered because of the accumulation of reactant and carbonaceous materials on the surface. Hydrogen peroxide completely regenerated the deactivated P25/GF catalyst by removing contaminants. However, the activity of the used DTS/GF catalyst was considerably enhanced by exposing it to hydrogen peroxide vapor to a level higher than the fresh catalyst due to the increase in the surface concentration of active oxidizing species as well as the removal of carbonaceous materials.

Keywords

Photocatalysis Titania Toluene Glass Fiber Hydrogen Peroxide

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