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The sorption behavior of Cs + , and Ba 2+  on natural clay was investigated using ToF-SIMS, XPS, and XRD. The natural clay was composed mainly of chlorite and illite in addition to quartz and calcite. Depth profiling up to 70 Å was performed at 10 Å steps utilizing ToF-SIMS to study the amount of sorbed Cs +  and Ba 2+  as a function of depth in the clay matrix. The results suggest that Cs +  and Ba 2+  ions were sorbed primarily by ion exchange coupled with hydrolytic sorption. According to ToF-SIMS and XPS results, the total sorbed amount of Ba 2+  was larger than that of Cs + . Quantitative determination of the primary cations within the analyzed clay before and after sorption indicated that for Ba 2+  sorption, Ca 2+ , Mg 2+  and for Cs +  sorption Ca 2+ , K +  were the major exchanging ions. The XRD spectra of Ba-sorbed clay contained new peaks that were identified as BaCO 3 .

Surface spectroscopic studies of Cs + , and Ba 2+ sorption on chlorite-illite mixed clay