A. Topalov, B. Abramović, D. Molnár-Gábor
May 31, 2001
Citations
2
Influential Citations
73
Citations
Quality indicators
Journal
Journal of Photochemistry and Photobiology A-chemistry
Abstract
Abstract The photocatalytic decomposition of the herbicide (4-chloro-2-methylphenoxy)acetic acid (MCPA), C9H9ClO3, in aqueous suspensions containing TiO2 was investigated by following the formation of intermediates via recording proton NMR spectra. One of theoretically possible intermediates, 4-chloro-2-methylphenolmethanoate, was synthesized by a modified esterification procedure. Based on the data obtained a possible reaction mechanism was proposed. The rate of MCPA aromatic ring decomposition was followed by pH changes during illumination. As a result, apparent reaction rate constant was found to be 7.0×10−6 mol dm−3 min−1. The complete mineralization was attained after about 15 h of illumination.