Abstract
The Mn(II)-catalysed ozonation of oxalic acid in aqueous solution is investigated at pH = 0 and pH = 4.7. Experiments are performed in both semi-batch and batch conditions by following the kinetic development of the ozonation processes. At pH = 0 first-order kinetics with respect to both ozone and Mn(II) are observed with no dependence upon the oxalic acid concentration. A rate constant of 6.2 × 10 4 l mol −1 min −1 and equimolar consumptions of ozone and oxalic acid are evaluated. At pH = 4.7 higher initial reactivities are observed whereas the low ozone to oxalic acid molar consumption ratios indicate the intervention of molecular oxygen in the oxidation process thus confirming its radical evolution. Reaction mechanisms are proposed to explain the observed reactive behaviours of the investigated systems.
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