Informatics Publishing Limited

Hai-Hua Li ¹, Wei-Feng Yan ¹, Rui-Jing Meng ¹, Liang Qian ¹, Ya-Ting Liu ¹

Affiliations
1 North China University of Water Resources and Electric Power, Zhengzhou, 450011, CN

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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