Effect of layer charge on fixation of cesium ions in smectites

摘要

In order to rationalize the influence of layer charge on cesium fixation in smectite, remaining Cs~+ or Na~+ in cesium-or sodium-saturated smectite specimen(Cs-or Na-specimen), respec- Tively, were examined after Ba~2+ exchange using a tracer method. The location of sorbed Cs~+ in Smectite was also studied by X-ray photoelectron spectroscopy(XPS). A linear multiple regressive Model has been used to formulate a relation between the amount of cesium left after Ba-exchange Of Cs-specimen and the layer charge characteristics. A good correlation between the amount of Remaining Cs and octahedral charge was observed for the Cs-specimen whereas for Na-specimen There was no viable change. From the analysis of the chemical states of sorbed-Cs by XPS, two Sorption sites were proposed for the Cs-specimen.