Diffusion models for adsorption kinetics of Zn(2+ ), Cd(2+ ) and Pb(2+ ) onto natural zeolite.

The kinetics of zinc, cadmium, and lead ions removal by natural zeolite-clinoptilolite has been investigated using an agitated batch adsorber. Batch experiments at constant temperature have been performed. The influence of agitation speed, initial heavy metals concentration and particle size of the sorbent on the removal efficiency of heavy metals from liquid phase have been studied.