Issue 8, 2001

Mechanistic examination of the titania photocatalyzed oxidation of ethanolamines

Abstract

In this study we focus on elucidating the mechanism of the photocatalyzed transformation of the primary, secondary and tertiary amines found in ethanolamine, diethanolamine and triethanolamine when present in illuminated aqueous titania dispersions. Photodecomposition of these ethanolamines leads to the evolution of CO2 through prior formation of various intermediate species. Ammonium (NH4+) and nitrate ions (NO3) are the ultimate products formed in the photoconversion of the amine nitrogen atoms, with NH4+ cations produced in greater quantity than NO3 anions for all three ethanolamines. Photooxidation of triethanolamine yields various intermediates, including a 3-pyrrolidone derivative, diethanolamine, and then ethanolamine, before complete mineralization occurs. The nature of the initial steps in the photodegradation was predicted by computer-aided molecular orbital (MO) calculations of point charges, and by frontier electron densities of all atoms in the ethanolamine structures.

Article information

Article type
Paper
Submitted
05 Mar 2001
Accepted
07 May 2001
First published
02 Jul 2001

New J. Chem., 2001,25, 999-1005

Mechanistic examination of the titania photocatalyzed oxidation of ethanolamines

S. Horikoshi, N. Watanabe, M. Mukae, H. Hidaka and N. Serpone, New J. Chem., 2001, 25, 999 DOI: 10.1039/B102186I

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