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Research Letters in Physical Chemistry
Volume 2008, Article ID 810457, 5 pages
http://dx.doi.org/10.1155/2008/810457
Research Letter

Pt/ T i O 2 Coupled with Water-Splitting Catalyst for Organic Pollutant Photodegradation: Insight into the Primary Reaction Mechanism

State Key Laboratory Breeding Base of Photocatalysis, Research Institute of Photocatalysis, Fuzhou University, Fuzhou 350002, China

Received 23 December 2007; Accepted 28 February 2008

Academic Editor: T. An

Copyright © 2008 Zizhong 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

A composited system was fabricated by coupling Pt/ T i O 2 with water-splitting catalyst for photooxidation of organic pollutants in aqueous solutions. The new composited system exhibits more efficient photocatalytic activity than pure Pt/ T i O 2 does under UV light irradiation. The promoting effect is dependent on the photo-produced H 2 over the composited system. The active oxygen species, hydroxyl radical ( OH) and hydrogen peroxide ( H 2 O 2 ), are measured by fluorescence spectroscopy and photometric method, respectively. The results reveal that the produced H 2 by photocatalytic water splitting over NiO/NaTa O 3 :La transfers to Pt particle of T i O 2 surface, then reacts with introducing O 2 to generate in situ intermediate H 2 O 2 , and finally translates into OH radical to accelerate the photooxidation of organic pollutants.