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Clarifying the role of silver deposits on titania for the photocatalytic mineralisation of organic compounds

Paper ID Volume ID Publish Year Pages File Format Full-Text
28437 44075 2006 12 PDF Available
Title
Clarifying the role of silver deposits on titania for the photocatalytic mineralisation of organic compounds
Abstract

The effect of silver deposits on titanium dioxide on the photocatalytic mineralisation of various organic compounds was investigated. A series of fourteen organic compounds comprising C, H and O atoms alone, were assessed to gain insights into the influence of photodeposited silver. Photodeposition of the silver provided a bimodal distribution of silver deposit sizes, comprising of deposits less than 5 nm and deposits approximately 100 nm in diameter.Silver deposits were found to promote, mildly deter or have a negligible effect on the mineralisation of the organics considered. Carboxylic acids generally experienced positive effects, deriving from their adsorption on TiO2 and susceptibility to photogenerated hole attack. Increasing chain length and the presence of additional methyl groups decreased the positive effects. Alcohols did not benefit by the presence of silver due to their limited adsorption on TiO2 at room temperature. Saccharides, while limited in their adsorption on TiO2, experienced increases in mineralisation rates up to eight times following silver deposition. Carboxylic acids are generated as intermediates during the oxidation of saccharides whose degradation may be enhanced by the silver deposits rather than the saccharides directly. Aromatics did not encounter any positive effects due to silver deposits. The negligible effects are thought to derive from intermediates generated during the early stages of degradation facilitating charge recombination or limiting the access of other intermediates more susceptible to hole attack to the TiO2 surface.

Keywords
Photocatalytic oxidation; Titanium dioxide; Silver; Mineralisation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 183, Issues 1–2, 30 September 2006, Pages 41–52
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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