Cesium Ion Uptake by Synthetic K-birnessite K0.30(Mn0.904+Mn0.033+□0.07)O2•0.50H2O

The ion-exchange properties of layered manganese oxide (K-birnessite) synthesized by decomposition of KMnO4 at 600 degrees C were examined. The material showed Cs+ uptake of 1.3 mmol g(-1) at pH 2-4 and 1.0 mmol g(-1) at pH 10. The distribution coefficients (K-d) of cations showed that the material is effective for Cs+ uptake in the solution (pH 1.7, pH 10) containing 0.1 mmol dm(-3) of Na+, K+, Cs+, Mg2+, and Ca2+.