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  • 09월 05일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제120회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Preliminary results of Mn(II) adsorption on Fe (oxyhydr)oxides in various conditions

2017년 9월 5일 11시 11분 16초
ENVR.P-527 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 19일 (목요일) 11:00~12:30
Environmental Energy
저자 및
Seonyi Namgung, Gieyeon Lee*
Department of Earth System Sciences, Yonsei University, Korea
Manganese (Mn) is abundant in the Earth’s crust as the 12th most abundant element and the 3rd most abundant transition metal. It is ubiquitous in most geological settings under a wide range of geochemical conditions such as soil, groundwater, ocean, and hydrothermal vent etc. The geochemical cycle of Mn in the environment plays an important role in the fate and transport of nutrients, toxic metals, and organic compounds by sorption or various biotic and abiotic redox processes. A redox sensitive Mn commonly exists in nature from +2 to +7. Mn(II) is principally soluble and forms a complexation with carbonate or phosphate, which is in equilibrium with insoluble solid phases (e.g., MnCO3(s)). Biotic and abiotic oxidation of dissolved Mn(II) consequently precipitates several Mn (oxyhydr)oxides dominantly composed of Mn(III) and Mn(IV) at various ratios. The adsorption of Mn(II) on the mineral surface is a fundamental and a crucial geochemical process to understand surface catalyzed Mn(II) oxidation and subsequent formation of various Mn (oxyhydr)oxides. However, the previous studies of Mn(II) adsorption have been generally focused on the treatment of contaminated Mn from wastewater by using several organic adsorbents (e.g., activated carbon, polyurethane). The mechanism of Mn(II) adsorption on various mineral surfaces in the environment have not been fully understood yet. In this study, the adsorption of Mn(II) on goethite (α-FeOOH) or hematite (α-Fe2O3) as a model adsorbent of Fe (oxyhydr)oxides was examined in various conditions as a function of pH, adsorbate/adsorbent ratio, and carbonate concentrations. The results of this study may provide a basic database of Mn(II) sorption on various mineral surfaces in the environment.