Abstract
Ion exchange kinetics of H+/Cs+ and H+/Sr2+ on strong and weak acid resins with gel and macroporous matrices was investigated at constant temperature. The rate was measured in a batch reactor using a potentiometric method under conditions favoring a particle diffusion controlled mechanism. Intraparticle interdiffusion coefficients were obtained by modeling the data with quasi‐homogeneous resin phase and bidisperse pore kinetic models, considering a two‐stage and parallel diffusion in macro‐ and micro‐pores, respectively. The ratios of the functional groups grafted in the micro‐ and macro‐pores were evaluated for different cases. The macroporous matrix produces a greater retarding effect than the gel skeleton.
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