Citation: Shu-Qing Lv, Yong-Sheng Zhao. The effect of metal ions with different valences on the retardation of soil-bentonite barrier materials and its mechanism[J]. Chinese Chemical Letters, ;2013, 24(12): 1075-1079. shu

The effect of metal ions with different valences on the retardation of soil-bentonite barrier materials and its mechanism

Shu-Qing Lv ^, ,
Yong-Sheng Zhao

1.
Key Laboratory of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun 130026, China

Corresponding author: Shu-Qing Lv,
Received Date: 5 June 2013
Available Online: 12 July 2013
Fund Project: This work was supported by Public Welfare Special Research of National Environmental Protection of China (No. 201309004). (No. 201309004)

In this paper, with K⁺, Ca²⁺ and Fe³⁺ as the objects of study, retardation of soil-bentonite (SB) barrier materials for metal ions with different valences is investigated, and the adsorption mechanism, migration patterns and permeation behavior are explored so as to provide a theoretical basis for their application. The results show that the adsorption process for metal ions with different valences by SB barriermaterials is fast, and the higher the valence, the greater the adsorption capacity. The fitting of the adsorption process conforms to pseudo-second-order adsorption kinetics and Langmuir-Freundlich adsorption equation, which explains that chemical adsorption is the dominating state and that the SB surface has certain heterogeneity. The permeability coefficient of K⁺, Ca²⁺ and Fe³⁺ in SB each has a maximum and the higher the valence, the sooner the maximum appears. Also the higher the valence, the more obvious the effect on SB retardation performance; and the sooner the ion breaks through the barrier wall completely, that is, the wall's retardation performance for higher valent ions may decline. 2013 Shu-Qing Lv. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
- Metal ions,
- Soil-bentonite,
- Barrier materials,
- Retardation,
- Mechanism
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