亚胺基二乙酸树脂对钬的吸附及机理  

Adsorption Behavior and Mechanism of Iminodiacetic Acid Resin for Holmium

作　　者：沈秋仙[1] 熊春华[1] 王惠君[2] 

机构地区：[1]丽水师范专科学校化学系,浙江丽水323000 [2]浙江海洋学院,浙江舟山316000

出　　处：《分析科学学报》2002年第5期365-368,共4页Journal of Analytical Science

基　　金：浙江省高校中青年学科带头人基金;浙江省教育厅资助项目 ( No.2 0 0 1 0 6 6 7);丽水市科技局计划项目( No.2 0 0 1 0 1 2 )

摘　　要：亚胺基二乙酸树脂 ( D40 1 )对钬 ( )的吸附在 p H=5.73时最佳。静态饱和吸附容量为 1 86.0 mg/ g(干树脂 ) ,用 2 .0 mol·L- 1HCl作解吸剂 ,解吸率为 96.0 % ,表观吸附速率常数 k2 98=2 .0 8× 1 0 - 5s- 1,表观吸附活化能 Ea=2 4.3 k J· mol- 1;等温吸附服从 Freundlich经验式 ;吸附热力学函数 ΔH0 =2 7.8k J·mol- 1;吸附机理表明D40 1功能基上的 O与 Ho3 + 发生配位键合 ,配位摩尔比约为 3Ho(Ⅲ) is quantitatively adsorbed by Iminodiacetic acid resin (D401) in the medium of pH=5.73 with the statically saturated sorption capacity of 186 mg/g·resin. 2.0 mol·L -1 HCl can be used as an eluant and the elution percentage is 96.0%.The sorption rate constant is k 298=2.08×10 -5s -1. The apparent sorption activation energy of D401 for Ho(Ⅲ) is 24.3 kJ·mol -1. The sorption behavior of D401 for Ho(Ⅲ) obeys the Freundlich isotherm.The enthalpy change ΔH 0 of sorption is 27.8 kJ·mol -1. Coordination molar ratio of the functional group of D401 to Ho(Ⅲ) is 3∶1. The study of sorption mechanism shows that the oxygen atom of the functional group of D401 coordinates with Ho(Ⅲ) to form coordination bond.

关 键 词：亚胺基二乙酸树脂 钬(Ⅲ) 吸附机理 富集 分析 稀土 

分 类 号：O652.6[理学—分析化学] O614.343[理学—化学]