The cesium loading kinetics of lithium, sodium, potassium, hydrogen, calcium, and barium-based clinoptilolite samples were determined by a “shallow bed” technique in the film and particle diffusion regions. Results showed cesium loading on lithium clinoptilolite to be the most rapid, and cesium loading on hydrogen clinoptilolite to be among the slowest reactions. Cesium loading on hydrogen-based clinoptilolite would be the faster if cation liquid diffusion velocities alone wTere rate-controlling. Both the hydrated replacement series and loading kinetics are influenced by cation-zeolitic water-anionic site interactions.

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