Mechanistic examination of the titania photocatalyzed oxidation of ethanolamines

Citation
S. Horikoshi et al., Mechanistic examination of the titania photocatalyzed oxidation of ethanolamines, NEW J CHEM, 25(8), 2001, pp. 999-1005
Citations number
11
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemistry
Journal title
NEW JOURNAL OF CHEMISTRY
ISSN journal
1144-0546 → ACNP
Volume
25
Issue
8
Year of publication
2001
Pages
999 - 1005
Database
ISI
SICI code
1144-0546(2001)25:8<999:MEOTTP>2.0.ZU;2-7
Abstract
In this study we focus on elucidating the mechanism of the photocatalyzed t ransformation of the primary, secondary and tertiary amines found in ethano lamine, diethanolamine and triethanolamine when present in illuminated aque ous titania dispersions. Photodecomposition of these ethanolamines leads to the evolution of CO2 through prior formation of various intermediate speci es. Ammonium (NH4+) and nitrate ions (NO3-) are the ultimate products forme d in the photoconversion of the amine nitrogen atoms, with NH4+ cations pro duced in greater quantity than NO3- anions for all three ethanolamines. Pho tooxidation of triethanolamine yields various intermediates, including a 3- pyrrolidone derivative, diethanolamine, and then ethanolamine, before compl ete mineralization occurs. The nature of the initial steps in the photodegr adation was predicted by computer-aided molecular orbital (MO) calculations of point charges, and by frontier electron densities of all atoms in the e thanolamine structures.