Removal behavior of hydrous manganese oxide and hydrous stannic oxide for Cs(I) ions from aqueous solutions

The removal behavior of hydrous manganese oxide (HMO) and hydrous stannic oxide (HSO) were assessed for Cs(I) ions as a function of adsorptive concentration, temperature, co-ion effect and pH applying a radiotracer technique. A first order uptake of Cs(I) obeying the Freundlich adsorption isotherm over the entire range of the adsorptive concentration (10−2 to 10−8 mol dm−3) for Cs(I) is established. The temperature (303–333 K) dependence study showed that the Cs uptake to be endothermic and irreversible in nature proceeding through an ion-exchange type mechanism. HMO and HSO were found to be fairly radiation stable towards a 11.1 GBq neutron source (associated with a nominal γ-dose of 1.72 Gy/h) for the removal of Cs(I). The uptake of metal ions is affected to varying degrees by presence of some diverse co-ions.