用具有不同矿物类型的铁砂和锰砂从水溶液中去除砷。

Removal of arsenic from aqueous solution by iron-coated sand and manganese-coated sand having different mineral types.

机构信息

Department of Environmental Engineering, Kwangwoon University, Seoul, Korea.

出版信息

Water Sci Technol. 2012;65(4):683-8. doi: 10.2166/wst.2012.910.

DOI:10.2166/wst.2012.910

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.

摘要

在这项研究中，评估了在制备锰包覆砂（MCS）和铁包覆砂（ICS）过程中涂层温度对去除 As(III) 和 As(V) 的影响。在 150°C 下制备的 MCS-150 中的氧化锰矿物类型被鉴定为软锰矿和水锰矿的混合物，在 300°C 以上变为高结晶软锰矿。在 150°C 下制备的 ICS-150 的矿物类型为针铁矿和赤铁矿的混合物，在 300°C 以上变为高结晶针铁矿。根据取决于涂层温度的矿物类型来确定吸附效率。与在 600°C 下制备的 MCS-600 和 ICS-600 相比，MCS-150 的 As(III)氧化效率和 ICS-150 的 As(V)吸附效率分别提高了约 77%和 70%。无论涂层温度如何，涂覆在砂底物上的锰和铁的量都相似。