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, (2): 261-265.
Citation:
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, (2): 261-265.
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, (2): 261-265.
Citation:
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, (2): 261-265.
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.