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| Effects of two ionic liquids on Cd2+ adsorption on four soils |
| Received:January 01, 2016 |
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| KeyWord:Cd2+;2,3-Pyridinedicarboxylic acid;4,5-Imidazoledicarboxylic acid;soils;adsorption |
| Author Name | Affiliation | E-mail | | XUAN Liang | School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | WANG Yu-jun | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | yjwang@issas.ac.cn | | LIU Hai-long | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | ZHOU Dong-mei | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | SUN Qing-ye | School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China | sunqingye@ahu.edu.cn |
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| Abstract: |
| The effects of 2,3-Pyridinedicarboxylic acid and 4,5-Imidazoledicarboxylic acid on Cd2+ adsorption on four soils with different characteristics(Wujin, Wuxian, Nanjing and Yixing soils) were investigated. Results showed that the adsorption of Cd2+ on soils depended on the characteristics of soils. The presence of ionic liquids significantly affected the adsorption of Cd2+ on soils. Compared with the control, the presence of 1 mmol·L-1 2,3-Pyridinedicarboxylic acid reduced the maximum adsorption of Cd2+ on Wujin, Wuxian, Nanjing and Yixing soils by 209, 834, 667 and 509 mg·kg-1, respectively, whereas adding 1 mmol·L-1 4,5-Imidazoledicarboxylic acid decreased the maximum Cd2+ adsorption by 226, 54, 124 and 81 mg·kg-1 on Wujin, Wuxian, Nanjing, and Yixing soils, respectively. Therefore, 2,3-Pyridinedicarboxylic acid showed greater effects on Cd2+ adsorption on tested soils than 4,5-Imidazoledicarboxylic acid did. The free Cd2+ ions in the equilibrium solution measured by Cd ion selective electrode showed that both ionic liquids were able to complex with Cd2+, leading to decreased Cd2+ ion concentrations in soil solution, and consequently reduced Cd2+ adsorption on soils. The complexing capability of 2,3-Pyridinedicarboxylic was stronger than that of 4,5-Imidazoledicarboxylic acid, which resulted in greater inhibition of Cd2+ sorption on soils. Our results indicate that ionic liquids could decrease the adsorption of Cd2+ on soils, but increase the mobilization and environmental risk of soil Cd2+. |
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