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| Study on Adsorption Behavior of Uranium in River Sediments of Linshui River |
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Received:July 30, 2021
Revised:August 09, 2021
Accepted:August 11, 2021
Published Online:October 20, 2021
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| DOI：doi：10.3969/j.issn.1007-7545.2021.11.016 |
| KeyWord:Linshui river; uranium; adsorption; sediment |
| Author | Institution |
| DING Yan |
东华理工大学核资源与环境国家重点试验室 |
| GAO Bai |
东华理工大学核资源与环境国家重点试验室 |
| Yang Fen |
东华理工大学核资源与环境国家重点试验室 |
| ZHANG Hai-yang |
东华理工大学核资源与环境国家重点试验室 |
| JIANG Wen-bo |
东华理工大学核资源与环境国家重点试验室 |
| SHI Tian-cheng |
东华理工大学核资源与环境国家重点试验室 |
| FANG Zheng |
东华理工大学核资源与环境国家重点试验室 |
| LIU Sheng-feng |
东华理工大学核资源与环境国家重点试验室 |
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| Abstract: |
| Adsorption behavior of uranium by sediment is an important link of uranium migration and transformation in rivers. It is great significance to reveal its adsorption rule for river water pollution prevention and control. In order to study adsorption mechanism of uranium by river sediments from Linshui river, static adsorption experiments were applied to analyze effects of adsorption time, pH value, initial concentration of uranium, ion types and heavy metals on uranium adsorption by sediments with different burial depths (0-10, 10-20, 20-30, and 30-40 cm, denoted by L1, L2, L3 and L4 respectively). The adsorption kinetics model and isothermal adsorption model were fitted at the same time. The results show that adsorption effect of uranium is different in sediments with different burial depths. The order of adsorption capacity is L1>L3>L2>L4, which mainly relates to organic matter content in sediment and chemical composition. According to kinetic model fitting, adsorption of uranium by L1 sediments is physical adsorption and chemical adsorption, L2 and L3 are mainly chemical adsorption, and L4 is mainly physical adsorption. The adsorption process of L1 and L3 can be described by Langmuir isothermal adsorption model, and the adsorption is monomolecular adsorption. The adsorption characteristics of L2 and L4 conform to Freundlich isothermal adsorption model, and adsorption is multi-molecular layer adsorption, which exists on heterogeneous surface. In different adsorption media, Ca2+, Mg2+ and CO32- have obvious inhibition effect on uranium adsorption from sediments, and the inhibition effect is Mg2+>CO32->Ca2+. Cd, Pb, Cu and Fe also have obvious inhibitory effects on uranium adsorption. |
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