FTIR study of adsorption and photodegradation of L-α-alanine on TiO2 powder

FTIR study of adsorption and photodegradation of L-α-alanine on TiO2 powder An infrared study of the adsorption of L-α-alanine (L-Ala) on TiO2 powder in aqueous suspension was carried out. When the amino acid is in the zwitterionic form and the TiO2 surface is positively charged, experimental results indicated that L-Ala molecules are adsorbed on titania through the carboxylated group, which gives rise to a bridged structure with the positive centers (protonated hydroxyls) of the TiO2 surface. Adsorbed amino acid was photodegradated in model conditions by exposing the sample to UV light through the quartz walls of the IR cell. The amine function was found to be preferentially removed from the adsorbed L-Ala molecules during the initial period of UV irradiation, and then the complete mineralization of the rest of the molecular structure occurred. This surface process agrees with the results of the analysis of the species that diffuse from the surface of the photocatalyst into the bulk of the liquid medium in the actual photodegradation carried out with TiO2 suspended in aqueous solutions of L-Ala. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

FTIR study of adsorption and photodegradation of L-α-alanine on TiO2 powder

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Publisher
Brill Academic Publishers
Copyright
Copyright © 2002 by VSP 2002
Subject
Chemistry; Inorganic Chemistry; Physical Chemistry; Catalysis
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1163/15685670260188665
Publisher site
See Article on Publisher Site

Abstract

An infrared study of the adsorption of L-α-alanine (L-Ala) on TiO2 powder in aqueous suspension was carried out. When the amino acid is in the zwitterionic form and the TiO2 surface is positively charged, experimental results indicated that L-Ala molecules are adsorbed on titania through the carboxylated group, which gives rise to a bridged structure with the positive centers (protonated hydroxyls) of the TiO2 surface. Adsorbed amino acid was photodegradated in model conditions by exposing the sample to UV light through the quartz walls of the IR cell. The amine function was found to be preferentially removed from the adsorbed L-Ala molecules during the initial period of UV irradiation, and then the complete mineralization of the rest of the molecular structure occurred. This surface process agrees with the results of the analysis of the species that diffuse from the surface of the photocatalyst into the bulk of the liquid medium in the actual photodegradation carried out with TiO2 suspended in aqueous solutions of L-Ala.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Oct 13, 2004

References

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