氨基膦酸树脂吸附镝的研究

THE SORPTION OF DYSPROSIUM(Ⅲ) BY AMINO METHYLENE PHOSPHONIC ACID RESIN

研究了氨基膦酸树脂对镝 ( )的吸附性能及其机理。在 p H4 .5～ 5.7的 HAc- Na Ac体系中该树脂对镝有较好的吸附性能 ;静态吸附饱和容量为每 g树脂 2 38mg;用 2 mol· L-1HCl能较好地洗脱 ;吸附反应中的 Δ H0 =57.4 k J·mol-1,ΔG0 =- 36.8k J· mol-1,ΔS0 =316J· mol-1· K-1;等温吸附符合 Freundlich经验式 ;树脂功能基与镝 ( )的摩尔比为 2∶ 1;用化学法和红外光谱等探讨了吸附反应机理。

The sorption behavior and mechanism of amino methylene phosphonic acid resin (APAR) for dysprosium(Ⅲ) is reported.Experimental results show that APAR has a good sorption ability for Dy(Ⅲ) in the range of pH 4.5~5.7 in HAc NaAc medium.The static saturation sorption capacity of APAR is 238 mg/g.Dy(Ⅲ) adsorbed on APAR can be eluted quantitatively by using 2 mol·L -1 HCl as an eluant.The thermodynamic sorption parameters of APAR for Dy(Ⅲ) are Δ H 0=57.4 kJ·mol -1 ,Δ G 0=-36.8 kJ·mol -1 ,Δ S 0=316 J·mol -1 ·K -1 . The sorption behavior of APAR for Dy(Ⅲ) obeys the Freundlich isotherm.The coordination molar ratio of the functional group of APAR to Dy(Ⅲ) is 2∶1.The sorption mechanism of APAR for Dy(Ⅲ) is discussed with chemical analysis and IR spectrometry.