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.
Removal of arsenic from aqueous solution by iron-coated sand and manganese-coated sand having different mineral types
Yoon-Young Chang, Ki-Hoon Song, Mok-Ryun Yu, Jae-Kyu Yang; Removal of arsenic from aqueous solution by iron-coated sand and manganese-coated sand having different mineral types. Water Sci Technol 1 February 2012; 65 (4): 683–688. doi: https://doi.org/10.2166/wst.2012.910
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