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The radioactive decontamination of water, soil and other materials requires cheap and effective adsorbents. Artificial zeolites synthesized from an industrial waste (coal fly ash: Na-P1 type zeolite) and a natural material (diatomite: mordenite type zeolite) have a high Cs adsorptivity in the adsorption experiments using 0.1 g of the zeolite and 50mL of up to 7.5mM CsCl. The coexisting cation suppressed the Cs adsorption onto the zeolites, and the effect of the suppression was in the order, K > Na > Ca2+ >Mg2+. A thermodynamic analysis proved that the Cs adsorption onto the two zeolites was exothermic favoring a lower temperature. The artificial mordenite showed a greater Cs adsorption strength, higher distribution coefficient and lower "G°, especially at low Cs concentrations. Adsorption isotherm analysis by the Langmuir, Freundlich, Temkin and DubininRadushkevich models showed a greater Cs adsorption selectivity for the artificial mordenite even at a low pH.

Adsorption characteristics of Cs<sup>+</sup> onto artificial zeolites synthesized from coal fly ash and diatomite