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Removal Characteristic of Arsenic by Sand Media Coated with both Iron-oxide and Manganese-oxide  

Kim, Byeong-Kwon (Department of Environmental Engineeing, Kwangwoon University)
Min, Sang-Yoon (Department of Environmental Engineeing, Kwangwoon University)
Chang, Yoon-Young (Department of Environmental Engineeing, Kwangwoon University)
Yang, Jae-Kyu (Division of General Education, Kwangwoon University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.31, no.7, 2009 , pp. 473-482 More about this Journal
Abstract
In this study, iron and manganese coated sand (IMCS) was prepared by mixing Joomoonjin sand with solutions having different molar ratio of manganese ($Mn^{2+}$) and iron ($Fe^{3+}$). Mineral type of IMCS was analyzed by X-ray diffraction spectroscopy. Removal efficiency of arsenic through As(III) oxidation and As(V) adsorption by IMCS having different ratio of Mn/Fe was evaluated. The coated amount of total Mn and Fe on all IMCS samples was less than that on sand coated with iron-oxide alone (ICS) or manganese-oxide alone (MCS). The mineral type of the manganese oxide on MCS and iron oxides on ICS were identified as ${\gamma}-MnO_2$ and mixture of goethite and magnetite, respectively. The same mineral type was appeared on IMCS. Removed amount As(V) by IMCS was greatly affected by the content of Fe rather than by the content of Mn. Adsorption of As(V) by IMCS was little affected by the presence of monovalent and divalent electrolytes. However a greatly reduced As(V) adsorption as observed in the presence of trivalent electrolyte such as $PO_4\;^{3-}$. As(III) oxidation efficiency by MCS in the presence of NaCl or $NaNO_3$ was two times greater than that in the presence of $PO_4\;^{3-}$. Meanwhile a greater As(III) oxidation efficiency was observed by IMCS in the presence of $PO_4\;^{3-}$. This was explained by the competitive adsorption between phosphate and arsenate on the surface of IMCS.
Keywords
Mn Coated Sand; Fe Coated Sand; Mn-Fe Coated Sand; Adsorption; Oxidation; Arsenic;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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