亚胺基二乙酸树脂对镨的吸附性能及其机理  

Adsorption behavior and mechanism of diglycolamidic acid resin for praseodymium

作　　者：施林妹 莫建军[2] 熊春华[2] 

机构地区：[1]丽水师专职业技术学院,丽水323000 [2]丽水师范专科学校化学系,丽水323000

出　　处：《化学试剂》2003年第2期74-76,99,共4页Chemical Reagents

基　　金：浙江省高校中青年学科带头人基金;浙江省自然科学基金(编号200072);浙江省教育厅科研资助项目(编号20010677)

摘　　要：研究了镨离子在亚胺基二乙酸树脂(D401)上的吸附行为,在pH5.73时吸附最佳。测得静态饱和吸附容量为162mg·g^(-1)(树脂);用0.1～3.0mol·L^(-1)_HCl可定量洗脱;表观速率常数k_(298)=2.96×10^(-5)s^(-1);表观活化能E_a=7.18kJ·mol^()-1;等温吸附服从Freundlich经验式;吸附热力学参数△H=10.4kJ·mol^(-1),△S=45.4J·mol^(-1)·K^(-1),△G=-3.10kJ·mol^()-1;树脂功能基与镨离子的配位摩尔比为3:1;用化学和红外光谱等方法探讨了吸附机理。The adsorption behavior of diglycolamidic acid resin(D401) for Pr(Ⅲ) was investigated. Diglycolamidic acid resin (D401 ) has a good adsorptivity for Pr(Ⅲ) in HAc-NaAc medium at pH5. 73. The statically saturated sorption capacity is 162 mg/g·resin. Pr(Ⅲ) adsorbed on D401 can be eluted quantitatively by using 0. 1-3.0mol/ L hydrochloric acid as the eluant. The apparent rate con-stant is k298-2. 96×10^(-5)s-1. The apparent activation energy of D401 for Pr(Ⅲ) is 7. 18kJ·mol-1. The sorption behavior of D401 for Pr (Ⅲ) obeys the Freundlich isotherm. The sorption thermodynamic parameters of D401 for Pr(Ⅲ)are:enthalpy change △H=10. 4kJ·mol-1 ,free energy change △G= -3. 10kJ·mol-1 ,entropy change AS = 45. 4J·mol-1·K-1', respectively. The coordination molar ratio of the functional group of D401 to Pr(Ⅲ) is 3 :1; the sorption mechanism of D401 for Pr(Ⅲ) was confirmed by chemical analysis and IR spectrometry.

关 键 词：亚胺基二乙酸树脂 镨 吸附性能 吸附机理 富集 提取 

分 类 号：O614.334[理学—无机化学] O647.31[理学—化学]