| A study on the exchange additivity of zinc in solid mixtures in seawater——Ⅱ.Stepwise exchange in δ-MnO2/montmorrillonite mixture |
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| 作者姓名： | Meng Xiaoguang Zhang Zhengbin Liu Liansheng |
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| 作者单位： | Shandong College of Oceanography, Qingdao, China;Shandong College of Oceanography, Qingdao, China;Shandong College of Oceanography, Qingdao, China |
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| 基金项目： | Project Supported by the National Natural Science Foundation of China |
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| 摘 要： | In this study the zinc exchange process and the reason for the non-additive exchange of δ-MnO2/montmorrillonite have been investigated. The results suggest that with pH increasing from 2 to 8, the stepwise exchange of zinc occurs on δ-MnO. and montmorrillonite in their mixture.At low pH zinc ions are bound on δ-MnO2, while at high pH, the exchange on montmorrillonite dominates the surface interaction in the mixture. The study demonstrates that the stepwise exchange and the heterogeneity of the binding sites on δ-MnO2 surface are the reason for the non-additive exchange. It is also shown that when δ-MnO2 amounts to 5 %, zinc exchange on sea sediments is controlled by 8-MnO2.
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| 收稿时间： | 1987/5/23 0:00:00 |
| 修稿时间： | 1987/10/6 0:00:00 |
A study on the exchange additivity of zinc in solid mixtures in seawater——Ⅱ.Stepwise exchange in δ-MnO2/montmorrillonite mixture |
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| Meng Xiaoguang,Zhang Zhengbin,Liu Liansheng.A study on the exchange additivity of zinc in solid mixtures in seawater——Ⅱ.Stepwise exchange in δ-MnO2/montmorrillonite mixture[J].Acta Oceanologica Sinica,1988,7(2):261-265. |
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| Authors: | Meng Xiaoguang Zhang Zhengbin and Liu Liansheng |
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| Institution: | Shandong College of Oceanography, Qingdao, China |
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| Abstract: | In this study the zinc exchange process and the reason for the non-additive exchange of δ-MnO2/montmorrillonite have been investigated. The results suggest that with pH increasing from 2 to 8, the stepwise exchange of zinc occurs on δ-MnO2 and montmorrillonite in their mixture.At low pH zinc ions are bound on δ-MnO2, while at high pH, the exchange on montmorrillonite dominates the surface interaction in the mixture. The study demonstrates that the stepwise exchange and the heterogeneity of the binding sites on δ-MnO2 surface are the reason for the non-additive exchange. It is also shown that when δ-MnO2 amounts to 5%, zinc exchange on sea sediments is controlled by δ-MnO2. |
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