D152树脂对镝的吸附及机制  

Adsorption Behavior and Mechanism of D152 Resin for Dy(Ⅲ)

作　　者：孙静亚[1] 王惠君[1] 

机构地区：[1]浙江海洋学院海洋科学与技术学院,浙江舟山316004

出　　处：《稀有金属》2006年第1期65-68,共4页Chinese Journal of Rare Metals

基　　金：浙江省教育厅科研资助项目(20040551);舟山市科技局计划项目(04114)

摘　　要：对D152树脂吸附镝(Ⅲ)的过程及镝在D152树脂上的吸附行为进行了研究。研究了介质pH、温度、吸附时间、树脂量等因素对吸附过程的影响。实验结果表明:D152树脂对镝(Ⅲ)的吸附在pH=5.93的HAc-NaAc的缓冲溶液中为最佳。25℃时静态饱和吸附量为314.6mg.g-1(干树脂)。用1.0 mol.L-1的HCl溶液作为解吸剂,解吸率为96.2%;D152树脂对镝(Ⅲ)的表观吸附活化能Ea=18.28 kJ.mol-1,表观吸附速率常数k298=2.54×10-5s-1,k308=2.93×10-5s-1,k318=4.05×10-5s-1,测得热力学参数分别为ΔH=18.19 kJ.mol-1,ΔG=-0.88 kJ.mol-1,ΔS=63.99 J.mol-1.K-1,等温吸附服从Freundlich经验式。并用化学和红外光谱的方法探求树脂对镝(Ⅲ)的吸附机制。The effect of resin tors such as pH of medium, time, resin concentration etc mental results show that the adsorption, and the factemperature, adsorption were studied. Experioptimal medium pH for adsorption by D152 resin for Dy^3＋ is pH = 5.93 in the HAc-NaAc medium. The static adsorption capacity of D152 resin for Dy^3＋ is 314.6 mg·g^-1. The adsorption rate constant is k29s = 2.54 × 10^3 s^-1, k308 = 2.93 × 10^3 s^-1, k318 = 4.05 × 10^3 s^-1. The adsorption parameters of thermodynamics are ΔH = 18.19 kJ·mo1^-1, AS =63.99 J·mol^-1·K^-1, AG = - 0.88 kJ·mo1^-1. The adsorption mechanism of D152 resin for Dy^3＋ was confirmed by chemical analysis and IR spectra.

关 键 词：D152树脂 吸附 机制 镝(Ⅲ) 

分 类 号：O617.3[理学—无机化学] O614.33[理学—化学]