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Transformation of Endocrine Disrupting Chemicals (EDCs) by Manganese(IV) Oxide  

Lee, Seung-Hwan (Department of Civil and Environmental Engineering, Seoul National University)
Choi, Yong-Ju (Department of Civil and Environmental Engineering, Seoul National University)
Chung, Jae-Shik (Department of Civil and Environmental Engineering, Seoul National University)
Nam, Taek-Woo (Department of Civil and Environmental Engineering, Seoul National University)
Kim, Young-Jin (Department of Civil and Environmental Engineering, Seoul National University)
Nam, Kyoung-Phile (Department of Civil and Environmental Engineering, Seoul National University)
Publication Information
Journal of Soil and Groundwater Environment / v.14, no.1, 2009 , pp. 44-50 More about this Journal
Abstract
The occurrence of endocrine disrupting compounds (EDCs), chemicals that interfere with human hormone system, are increasing in the freshwater, waste water and subsurface as well. In this study, we determined the reactivity of three EDCs in the presence of birnessite. In aqueous phase, bisphenol A, 2,4-dichlorophenol and 17${\beta}$-estradiol, which possesses phenoxy-OH, were very rapidly transformed by birnessite: up to 99% of initial concentrations (50 mg/L for bisphenol A, 100mg/L for 2,4-dichlorophenol, and 1.5mg/L for 17${\beta}$-estradiol) were destroyed within 60 minutes. Especially, bisphenol A was the most reactive chemical, disappearing by 99% in a few minutes. The reaction occurred on the surface of birnessite, showing a linear increase of first-order kinetic constants with the increase of the surface area of birnessite. In soil slurry phase, the reactivity of birnessiteto EDCs was faster than in aqueous phase probably due to the cross coupling reaction of phenoxy radicals with soil organic matter. Considering the rapid transformation of the EDCs in the both phases, this oxidative cross coupling reaction mediated by birnessite would be an effective solution for the remediation of EDCs in environmental media, especially in soil.
Keywords
Endocrine disrupting chemicals; Birnessite; Humification; Oxidative coupling;
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