Platinum and palladium in semiconductor photocatalytic systems

S.K. Lee, A. Mills

Research output: Contribution to journalArticle

62 Citations (Scopus)

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 > 100ºC) 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.
Original languageEnglish
Pages (from-to)61-72
Number of pages11
JournalPlatinum Metals Review
Volume47
Issue number2
Publication statusPublished - 1 Apr 2003

Fingerprint

Palladium
Platinum
Photocatalysis
Titanium
Semiconductor materials
Deposits
Organic pollutants
Purification
Air purification
Volatile Organic Compounds
Water
Photocatalysts
Air
Volatile organic compounds
Metals
Oxygen
titanium dioxide
Electrons
Temperature

Keywords

  • semiconductor photocatalysis
  • platinum metals

Cite this

Lee, S.K. ; Mills, A. / Platinum and palladium in semiconductor photocatalytic systems. In: Platinum Metals Review. 2003 ; Vol. 47, No. 2. pp. 61-72.
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Lee, SK & Mills, A 2003, 'Platinum and palladium in semiconductor photocatalytic systems', Platinum Metals Review, vol. 47, no. 2, pp. 61-72.

Platinum and palladium in semiconductor photocatalytic systems. / Lee, S.K.; Mills, A.

In: Platinum Metals Review, Vol. 47, No. 2, 01.04.2003, p. 61-72.

Research output: Contribution to journalArticle

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T1 - Platinum and palladium in semiconductor photocatalytic systems

AU - Lee, S.K.

AU - Mills, A.

PY - 2003/4/1

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AB - 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 > 100ºC) 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.

KW - semiconductor photocatalysis

KW - platinum metals

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JO - Platinum Metals Review

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