Photocatalytic oxidation of the herbicide (4-chloro-2-methylphenoxy)acetic acid (MCPA) over TiO2 |
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Authors: | A Topalov B Abramovi D Molnr-Gbor J Csandi O Arcson |
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Institution: | A. Topalov, B. Abramovi
, D. Molnár-Gábor, J. Csanádi,O. Arcson |
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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. |
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Keywords: | Photocatalytic oxidation Herbicide MCPA Titanium(IV) oxide |
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