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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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海水中混合交换剂对Zn(Ⅱ)交换加和性研究——Ⅱ.δ-MnO2/蒙脱石混合物对Zn(Ⅱ)的分步交换
, PP. 576-580
Abstract:
本文探讨了δ-MnO2/蒙脱石混合物对Zn(Ⅱ)的交换过程及交换作用非加和性的原因.实验证明,在pH由低到高变化时,混合物中的δ-MnO2和蒙脱石对Zn(Ⅱ)的交换是分步进行的.在低pH时Zn(Ⅱ)首先在δ-MnO2上发生交换作用;在高pH时Zn(Ⅱ)在蒙脱石上的交换作用占主要地位.分析认为,分步交换作用的产生是造成δ-MnO2/蒙脱石混合物交换作用低于加和情况的必要条件,δ-MnO2表面交换点交换活性的不同是造成这种非加和性交换的根本原因.实验还证明,沉积物中δ-MnO2含量达到5%时,它对Zn(Ⅱ)的交换规律主要由δ-MnO2决定.
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