Abstract:

The Na+-Cu2+ ion exchange on the Na-form clinoptilolite was studied by the batch reaction method. The film diffusion constants R, the particle-internal diffusion coefficients D and the delay time τd were determined, respectively. The results showed that the exchange rate is controlled by the film diffusion at the start of the reaction, and is controlled by the particle internal diffusion in the rest time of the ion exchange. The influences of temperature and concentration on the exchange rate, the exchanged amount in the equilibrium and delay time in the diffusion process were discussed also.

Key words: Ion exchange kinetics, Clinoptilolite