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Authors
Affiliations
1 North China University of Water Resources and Electric Power, Zhengzhou, 450011, CN
Source
Nature Environment and Pollution Technology, Vol 15, No 1 (2016), Pagination: 305-310
Abstract
To understand the influencing factors of the sediment adsorption of As3+, prototype sand of the Yellow River was taken as the material. The effects of sediment adsorption saturation time and adsorption regularities were investigated when coexisting ions Fe3+ and Mn2+ existed. The results show that: (1) when there was only As3+ existing alone, the saturation time was 60 min; when Fe3+ and Mn2+ were added, the saturation time was 90 min; (2) when Fe3+ existed, the sediment adsorption laws of As3+ were as follows: during the initial period, with the increasing concentration of Fe3+, the adsorption decreased; when the concentration of Fe3+ was more than 0.4mg/L, the adsorption capacity increased with the increasing concentration of Fe3+; when there was Mn2+ existing, the regulation also showed that it initially decreased slightly and then increased, i.e., when Mn2+ was less than 1.0mg/L, the adsorption capacity decreased with the increasing concentration of Mn2+; when Mn2+ was higher than 1.0mg/L, the adsorption capacity increased with the increasing concentration of Mn2+; when Fe3+ and Mn2+ coexisted, the sediment adsorption of As3+ increased with the increasing concentration of the coexisting ions; (3) when the coexisting ion concentration was 0.2-0.4mg/L, the removal rate of Fe3+ was less than that of Mn2+, and also less than that of the coexistence of Fe3+ and Mn2+. When the concentration of coexistent ions is less than 0.2 or more than 0.4 mg/L, the removal rate of Mn2+ was less than Fe3+, and also less than that of the coexistence of Fe3+ and Mn2+.
Keywords
As(III), Sediment Sorption, Coexisting Ions, Fe, Mn.
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