Platinum and Palladium in Semiconductor Photocatalytic Systems: Factors Affecting the Purification of Water and Air

By S.-K. Lee; A. Mills

doi:10.1595/003214003X4726172

ISSN: 0032-1400

oa Platinum and Palladium in Semiconductor Photocatalytic Systems

Factors Affecting the Purification of Water and Air
Authors: By S.-K. Lee¹ and A. Mills¹
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Affiliations: ¹ Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland
Source: Platinum Metals Review, Volume 47, Issue 2, Apr 2003, p. 61 - 72
DOI: https://doi.org/10.1595/003214003X4726172
- Published online: 01 Jan 2003

Abstract

A wide range of organic pollutants can be destroyed by semiconductor photocatalysis using titania. The purification of water and air contaminated with organic pollutants has been investigated by semiconductor photocatalysis for many years and in attempts to improve the purification rate platinum and palladium have been deposited, usually as fine particles, on the titania surface. Such deposits are expected to improve the rate of reduction of oxygen and so reduce the probability of electron-hole recombination and increase the overall rate of the reaction. The effectiveness of the deposits is reviewed here and appears very variable with reported rate enhancement factors ranging from 8 to 0.1. Semiconductor photocatalysis can be used to purify air (at temperatures > 100°C) and Pt deposits can markedly improve the overall rate of mineralisation. However, volatile organic compounds containing an heteroatom can deactivate the photocatalyst completely and irreversibly. Factors contributing to the success of the processes are considered. The use of chloro-Pt(IV)-titania and other chloro-platinum group metals-titania complexes as possible visible light sensitisers for water and air purification is briefly reviewed.

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Platinum and Palladium in Semiconductor Photocatalytic Systems

Platinum Metals Review 47, 61 (2003); https://doi.org/10.1595/003214003X4726172

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oa Platinum and Palladium in Semiconductor Photocatalytic Systems

Factors Affecting the Purification of Water and Air

Abstract

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