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Exchange rates of calcium ion with high aluminum zeolites used in detergent, such as NaA, MAP and MAX zeolites, were measured by using a improved calcium ion selective electrode method (ISE). The calcium exchange kinetics of zeolites was studies by using Body Reichenberg diffusion equation. The effects of the particle size, pore structure of zeolites and the ion exchange temperature on the calcium ion exchange kinetics were also investigated. Results showed that the diffusion coefficients at room temperature were 2.33×10-15m2·s-1, 4.28×10-16m2· s-1 and 7.73×10-17m2·s-1 for zeolite MAX, NaA and MAP, respectively. The activation energy of diffusion was 48kJ·mol-1, 65kJ·mol-1 and 91kJ·mol-1 for zeolite MAX, NaA and MAP, respectively.
Exchange rates of calcium ion with high aluminum zeolites used in detergents, such as NaA, MAP and MAX zeolites, were measured by using a modified calcium ion selective electrode method (ISE). The calcium exchange kinetics of zeolites was studies by using Body Reichenberg diffusion equation. The effects of the particle size, pore structure of zeolite and the ion exchange temperature on the calcium ion exchange kinetics were also investigated. The diffusion coefficient at room temperature were 2.33 × 10-15m2 · s-1, 4.28 × 10-16m2 · s-1 and 7.73 × 10-17m2 · s-1 for zeolite MAX, NaA and MAP, respectively. The activation energy of diffusion was 48 kJ · mol -1, 65 kJ · mol -1 and 91 kJ · mol -1 for zeolite MAX, NaA and MAP, respectively.