title: Removal of arsenic from aqueous solution by iron-coated sand and manganese-coated sand having different mineral types.
abstract: In this study, the effects of the coating temperature during the preparation of manganese-coated sand (MCS) and iron-coated sand (ICS) on the removals of As(III) and As(V) were evaluated. The mineral type of manganese oxide on MCS-150, prepared at 150 °C, was identified as a mixture of pyrolusite and ramsdellite, which changed to high crystalline pyrolusite above 300 °C. The mineral type of ICS-150, prepared at 150 °C, was a mixture of goethite and hematite, which changed to high crystalline goethite above 300 °C. The adsorption efficiency was determined according to the mineral type which depended on the coating temperature. The As(III) oxidation efficiency of MCS-150 and As(V) adsorption efficiency of ICS-150 were approximately 77 and 70% higher compared with those of MCS-600 and ICS-600, respectively, prepared at 600 °C. Regardless of the coating temperature, the amounts of manganese and iron coated on the sand substrates were similar.
authors.affiliation: Department of Environmental Engineering, Kwangwoon University, Seoul, Korea.
authors.forename: Yoon-Young
authors.initials: YY
authors.lastname: Chang
authors.forename: Ki-Hoon
authors.initials: KH
authors.lastname: Song
authors.forename: Mok-Ryun
authors.initials: MR
authors.lastname: Yu
authors.forename: Jae-Kyu
authors.initials: JK
authors.lastname: Yang
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D008345:Manganese / Q000737:chemistry*; D008903:Minerals / Q000737:chemistry; D010084:Oxidation-Reduction; D010316:Particle Size; D012822:Silicon Dioxide / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D008903:Minerals; D012996:Solutions; D014867:Water; D008345:Manganese; D012822:Silicon Dioxide; D007501:Iron; D001151:Arsenic