The adsorption behavior and mechanism of a novel chelate resin, iminodiacetic acid resin (IDAAR) for Y (Ⅲ) were investigated. The statically saturated adsorption capacity is 102mg @ g-1 resin at 298K in HAc-NaAc medium at pH 5.7. Y (Ⅲ) adsorbed on IDAAR can be reductively eluted by 1.0 ～ 4. 0mol @ L- 1 HCl used as eluant and the elution percentages are almost as high as 100%. The resin can be regenerated and reused without apparent decrease in adsorption capacity. The apparent adsorption rate constant is k298 = 3.36 × 10-5s-1. The adsorption behavior of IDAAR for Y (Ⅲ) conforms to Freundlich's model reasonably. The thermodynamic adsorption parameter, enthalpy change AH of IDAAR for Y (Ⅲ) is 18.6kJ @ mol-1. The complex molar ratio of the functional group of IDAAR to Y(Ⅲ) is about 3: 1. The adsorption mechanism of IDAAR for Y (Ⅲ) was examined by using chemical method and IR spectrometry.
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