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3728291 
Journal Article 
Mn(II)-enhanced oxidation of benzoic acid by Fe(III)/H2O2 system 
Zhao, Ji; Yang, J; Ma, Jun 
2014 
Yes 
Chemical Engineering Journal
ISSN: 1385-8947 
239 
171-177 
WOS:000330485700020 
This study investigated the enhanced oxidation of benzoic acid (BA) by Fenton-like system (Fe(III)/H2O2) with manganese ion (Mn(II)). Experiments were conducted at pH 3.0, with Fe in the low concentration, H2O2 in excess and Mn(II) in a wide range. In all cases, Mn(II), which is very inert to H2O2, significantly enhanced the oxidation of BA, accelerated the formation of Fe(II) and the decomposition of H2O2. The pseudo-first-order rate constant for the initial lag phase and the half-life of BA were calculated to evaluate the degree of enhancement in the presence of Mn(II). As a primary product, the concentration of p-hydroxybenzoic acid (pHBA) was monitored during the oxidation. The ratio between formed pHBA and oxidized BA indicated that HO center dot dominated the oxidizing process, and this was further confirmed by the inhibition of tert-butanol on the oxidation of BA. Finally, the role of Mn(II) in Fe(III)/H2O2 system was analyzed, and a series of reactions including manganese species, HO center dot, HO2 center dot/O-2(center dot-) and H2O2 were proposed to be the possible reason for the enhancement. (C) 2013 Elsevier B.V. All rights reserved. 
Fenton-like; Manganese ion; Benzoic acid; Quinone-like substrates