engleski

Intraparticle diffusion of Pb, Cu and Zn ions during exchange process on the natural zeolite clinoptilolite

It is well known that natural zeolites behave as good ion exchangers for removal of heavy metal ions from aqueous solutions. But the selectivity of natural zeolite for a particular ion depends on the type of zeolite and on the type, hydrated radius, and concentration, of exchangeable ion in the solution. Examination of ion exchange kinetics, determination of diffusion rate, diffusion coefficients, and the mechanism that controls the overall process are important for application of these processes in practice. The diffusion kinetics of heavy metal ions is often examined on natural zeolite clinoptilolite which shows high selectivity for these ions, e.g., for lead ions. This paper examines the kinetics of lead, copper, and zinc ion exchange on clinoptilolite. The kinetic parameters of the ion exchange process have been calculated using the empirical homogeneous diffusion model.

lead; copper; zinc; diffusion; clinoptilolite

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