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ABSTRACT
The ion exchange behavior of three sodium micas (phlogopite, Ward's Sci.; phlogopite, Suzorite Inc., biotite, Ward's Sci.) towards Li+, K+, Rb+, Cs+, Mg2+. Ca2+, Sr2+, Ba2+, Pb2+ Hg2+, Co2+, Cu2+ Cd2+ and Zn2+ ions has been studied. The ion exchange isotherms of alkali, alkaline earth and some other divalent cations were determined and concentration equilibrium constants as a function of metal loading and temperature were analyzed. Sodium micas exhibit high affinity for heavy alkali metals with the selectivity order Rb+ > Cs+ > K+. By studying the cesium uptake in the presence of NaNO3, CaCl2, NaOH, NaOH+KOH, HNO3 electrolytes (in the range of 0.01–6 M) it was found that sodium micas could remove cesium efficiently in neutral and alkaline media, which make them promising for certain types of nuclear waste treatment.