Study on the kinetics of ion exchange in ternary system of H+-Na+-UO22+

The kinetics of ion exchange in the ternary system of H+-Na+-UO22+ is studied with strong acidic cation exchange resin. The valuable conclusions are made by comparing the experimental results in this system with that in binary system. The particle diffusion coefficients for given counter ion in the system are calculated by simulating the experimental data. Results show that the diffusions of the three kinds of counter ions in the solution are interdependent. Therefore, the three Nernst-Planck equations can only be approximately applied to the ternary system when each of the equations is used to describe the diffusion flux of a given counter ion respectively. The equilibrium selectivity coefficients of each counter ion in the system are reported