Oxidative treatment of aqueous monochlorobenzene with thermally-activated persulfate

Abstract

The oxidation of aqueous monochlorobenzene (MCB) solutions using thermally- activated persulfate has been investigated. The influence of reaction temperature on the kinetics of MCB oxidation was examined, and the Arrenhius Equation rate constants at 20°C, 30°C, 40°C, 50°C, and 60°C for MCB oxidation performance were calculated as 0, 0.001, 0.002, 0.015, 0.057 min^-1, which indicates that elevated temperature accelerated the rate. The most efficient molar ratio of persulfate/MCB for MCB oxidation was determined to be 200 to 1 and an increase in the rate constants suggests that the oxidation process proceeded more rapidly with increasing persulfate/MCB molar ratios. In addition, the reactivity of persulfate in contaminated water is partly influenced by the presence of background ions such as Cl^-, \mathrm{HC}{\mathrm{O}}_{\mathrm{3}}^{-}, \mathrm{S}{\mathrm{O}}_{\mathrm{4}}^{\mathrm{2}-}, and \mathrm{N}{\mathrm{O}}_{\mathrm{3}}^{-}. Importantly, a scavenging effect in rate constant was observed for both Cl^- and \mathrm{C}{\mathrm{O}}_{\mathrm{3}}^{\mathrm{2}-} but not for other ions. The effective thermally activated persulfate oxidation of MCB in groundwater from a real contaminated site was achieved using both elevated reaction temperature and increased persulfate/MCB molar ratio.

Keywords

persulfate / monochlorobenzene / advanced oxidation process

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