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Oxidative Coupling Reaction of Chlorophenols by Natural Manganese Dioxides  

Jeon Sun-Young (Department of Civil Engineering, Environmental Research Center, Kyunghee University)
Ko Seok-Oh (Department of Civil Engineering, Environmental Research Center, Kyunghee University)
Publication Information
Journal of Soil and Groundwater Environment / v.10, no.4, 2005 , pp. 62-69 More about this Journal
Abstract
Removal of 4-chlorophenol (4CP) by natural manganese dioxide (NMD) catalyzed reaction was investigated in this study. Tests were also carried out to evaluate the effects of pH and natural organic matter (NOM) on the degradative oxidation of 4CP. Experimental results proved that NMD was effective for the removal of 4CP. Extensive kinetic analysis suggests that overall oxidation of 4CP by NMD is second-order reaction, the first-order with respect to 4CP, and the first-order with respect to NMD, respectively. Also, 4CP oxidation rates on the Mn-oxide surfaces were highly dependent upon experimental conditions such as pH, initial concentration of 4CP or NMD, and existence of humic acid. As pH increased above PZC of NMD, the reaction rate of 4CP was decreased, due to the low affinity of 4CP on NMD at high pH. At pH lower than PZC of NMD, reaction rate of 4CP was also decreased. It was considered that humic acid was involved in the oxidative coupling reaction of 4CP by NMD, resulting in the enhanced degradation rate of 4CP. This study proved that natural manganese oxide can be effectively applied for the removal of chlorophenols in aqueous phase.
Keywords
Oxidative coupling; Reaction kinetic; pH; Humic acid;
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