Insight towards the role of platinum in the photocatalytic mineralisation of organic compounds

被引：60

作者：

Denny, Frans ^{[1
]}

Scott, Jason ^{[1
]}

Chiang, Ken ^{[1
]}

Teoh, Wey Yang ^{[1
]}

Amal, Rose ^{[1
]}

机构：

[1] Univ New S Wales, Sch Chem Sci & Engn, ARC Ctr Funct Nanomat, Sydney, NSW 2052, Australia

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2007年 / 263卷 / 1-2期

关键词：

platinum; titanium dioxide; photocatalysis; photodeposition;

D O I：

10.1016/j.molcata.2006.08.031

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The mineralisation of functionalised (hydroxyl and carboxylic) organic compounds by platinum deposits on titanium dioxide (Pt/TiO2) was investigated to study the catalytic and photocatalytic roles of platinum and the effect of organic molecular structure on these properties. Under dark conditions Pt/TiO2 catalysed the complete mineralisation of formic acid and partial mineralisation of oxalic acid and 1,2,3-trihydroxybenzene (1,2,3-THB). Under irradiated conditions, platinum deposits improved the mineralisation rate of each organic considered. Increasing carbon chain length of aliphatic compounds decreased mineralisation rates by both bare TiO2 and Pt/TiO2, attributed to steric hindrance effects for alcohols and the formation of rate limiting intermediates for carboxylic acids. Increasing the number of hydroxyl groups in aliphatic compounds increased mineralisation rates only by Pt/TiO2. This effect was not evident for hydroxylated aromatics. The findings suggest the degree of catalysis invoked by platinum deposits during photocatalysis is governed by the structural and functional characteristics of the target organic. (c) 2006 Published by Elsevier B.V.

引用

页码：93 / 102

页数：10

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