D113树脂对镝的吸附及机理

Studies on the Sorption Behavior and Mechanism of D113 Resin for Dy(Ⅲ)

研究了镝离子在大孔丙烯酸系阳离子交换树脂(D113)上的吸附行为,在pH=6.00时吸附最佳。测得静态饱和吸附容量为292.7mg/g(树脂);用0.5mol/LHCl可定量洗脱,一次解吸率为98.4%;表观速率常数k298=6.78×10-5s-1;表观活化能Ea=14.79kJ/mol;等温吸附服从Freundlich经验式;吸附热力学参数ΔH=14.48kJ/mol,ΔS=54.69J/mol·K,ΔG=-1.82kJ/mol;用化学和红外光谱等方法讨论了吸附机理。

The sorption behavior and mechanism of D113 resin for Dy(Ⅲ)is investigated by means of chemical method and IR spectrometry.The influences of medium pH, sorption temperature,sorption time, etc.on the sorption behavior and sorption mechanism of D113 resin for Dy3+were determined .The best medium pH of sorption of D113 resin for Dy3+is pH=6.00.The static sorption capacity of D113 resin for Dy3+is 292.7 mg/g. The best elution is 0.5 mol/L HCl.The sorption rate constant is k298=6.78×10-5s-1.The sorption parameters of thermodynamic are ΔH=14.48 kJ/mol,ΔS =54.69 J/mol·K,ΔG=-1.82 kJ/mol.The adsorption mechanism of D113 resin for Dy3+was confirmed by chemical analysis and IR spectra.