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Photocatalytic decomposition of l-serine and l-aspartic acid over bare and silver-deposited TiO2

Paper ID Volume ID Publish Year Pages File Format Full-Text
27623 44033 2010 9 PDF Available
Title
Photocatalytic decomposition of l-serine and l-aspartic acid over bare and silver-deposited TiO2
Abstract

The photocatalytic degradation of l-serine and l-aspartic acid was investigated over bare and silver-deposited TiO2 photocatalysts suspended into aqueous solutions of various pH. The conversion of the model compounds was followed by measuring the loss of the amine function and the formation of nitrogen containing ions, such as NH4+, NO2− and NO3−. In addition, the total organic carbon content (TOC), the total nitrogen content (TN) and the pH were also monitored. It is demonstrated that the initial rate of the photodegradation and the concentration of the surface complexes of amino acids increase with pH in that pH range where the zwitterionic form of amino acids is the principal species. The replacement of bare TiO2 particles with silver-deposited TiO2 particles results in an enhancement in the efficiency of the photocatalytic reaction. The increase in the initial rate has been found to be significant for serine and moderate for aspartic acid. The results of competitive kinetic measurements used oxalic acid as scavenger for photogenerated holes and that of the diffuse reflection Fourier transformed infrared (DRIFT) spectroscopy demonstrated the disappearance of model compounds on the surface of semiconductor particles of the UV irradiated samples have also been exploited for discussing the mechanism of photocatalytic decomposition of the amino acids.

Keywords
Photocatalytic decomposition; Serine; Aspartic acid; TiO2; Silver-deposited TiO2
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Photocatalytic decomposition of l-serine and l-aspartic acid over bare and silver-deposited TiO2
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 213, Issue 1, 10 June 2010, Pages 37–45
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
Full-text PDF Download
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Any Questions? feel free to contact us