铜、锌、镉在麦饭石上的吸附研究

STUDIES ON ABSORPTION OF COPPER,ZINC AND CADMIUM ON MAI FAN STONE

报道了在水溶液中麦饭石对Ｃｕ（Ⅱ）、Ｚｎ（Ⅱ）、Ｃｄ（Ⅱ）的吸附行为．其吸附量（）随各金属离子平衡浓度的变化规律，可分别用Ｆｒｅｕｎｄｌｉｃｈ方程和Ｌａｎｇｍｕｉｒ方程描述．百分吸附量（％）随ｐＨ值变化曲线为正“Ｓ”型，麦饭石对三种金属离子交换能力大小顺序为：Ｃｕ（Ⅱ）＞Ｚｎ（Ⅱ）＞Ｃｄ（Ⅱ）．２５℃ｐＨ为６．０￣８．０条件下，三种离子的饱和吸附量次序与其相同．本文还对吸附机理进行了探讨．

he present paper introduces the adsorption cbaractristics of copper, zine and cadmium on Mai Fan Stone in freshwater. The effect of pH values and copper, zinc, cadmium concentration on the absorption behavior is examined, and the saturated absorption density is examined.The results show that the absorption density () of copper, zinc and cadmium on Mai Fan Stone in freshwater increased with the increase of copper, zinc and cadmium equilibrium concentration when temperature and pH values are fixed, which satisfies Freundlich equatinn and Langmuir equation. From the faCt that the ratio of exchange (% ) -pH graph is an ' S' shaped curve .It is possible to deduce that the step of chemical reaction is a canon exchange. The order of first saturated ion exchange amount of metal ion on Mat Fan Stone is: copper(Cu(Ⅱ))>zinc(Zn(Ⅱ))>cadmium (Cd(Ⅱ)) The principles of the absorption mechanism are also disscused.