安徽明光凹凸棒石粘土对锶、铯、钴的吸附特性研究

采用静态吸附实验方法,研究了吸附时间、溶液pH值、吸附剂投加量和溶液初始浓度等因素对凹凸棒石粘土吸附Sr₂₊、Cs₊和Co₂₊的性能,并通过等温吸附模型拟合对其吸附过程及吸附机理进行了探讨。结果表明：凹凸棒石粘土对Sr₂₊、Cs₊和Co₂₊的吸附效果依次为Co₂₊ > Cs₊> Sr₂；Freundlich和D-R等温吸附模型能较好地描述凹凸棒石粘土对Sr₂₊、Cs₊和Co₂₊的吸附过程,其中,凹凸棒石粘土对Sr₂₊和Cs₊的吸附以物理吸附为主,而凹凸棒石对Co₂₊的吸附过程以化学吸附为主,并且其吸附方式主要为离子交换的方式发生。

Study On Adsorption Performance of Attapulgite Clay from Mingguang City of Anhui Province for Strontium , Caesium and Cobalt

The staticSadsorptionSexperimentsSwere carried out to investigateStheSadsorption performanceSof Strontium , Caesium and Cobalt on attapulgite clay in different adsorption time, pH values, adsorbent dosage and initial concentration, and the adsorption mechanism was also studied by adsorption isotherm equation. The adsorption process of Sr₂₊, Cs₊ and Co₂₊ on attapulgite clay could be well described by Freundlich and D-R isothermal adsorption equation, these results indicated that that the adsorption performance of attapulgite clay for Co₂₊ was best, and Cs₊ was better than Sr₂₊, and the adsorption process of Sr₂₊ and Cs₊ on attapulgite clay was is based principally on physical adsorption. However, the adsorption mechanism of Co₂₊ was chemical adsorption, and the adsorption process was controlled by ion exchange.