亚胺基二乙酸树脂对钆的吸附及其机理

ADSORPTION BEHAVIOR AND MECHANISM OF DIGLYCOLAMIDIC ACID RESIN FOR GADOLINIUM

亚胺基二乙酸树脂 (D40 1 )对钆 (Ⅲ )的吸附在pH =5 .73时最佳。树脂静态饱和吸附容量为 1 81mg/g,用 2 .0mol/LHCl作解吸剂 ,解吸率为 99.5 % ,表观吸附速率常数 (k2 98) =2 .1 1× 1 0 -5s-1,表观吸附活化能(△Ea) =2 0 .9kJ/mol;等温吸附服从Freundlich经验式 ;吸附热力学函数△H0 =1 9.6kJ/mol;吸附机理表明D40 1功能基上的O、N与Gd3 + 发生配位键合 ,树脂功能基与钆 (Ⅲ )的配位物质的量之比为 3∶1。

Gd(Ⅲ) was quantitatively adsorbed by diglycolamidic acid resin (D401) in the medium of pH=5.73.The statically saturated sorption capacity is 181mg/g resin .2.0 mol/ L HCl can be used as an eluant. The elution percentage is 99.5%.The sorption rate constant k 298 is 2.11×10 -5 s -1 .The apparent sorption activation energy of D401 for Gd(Ⅲ) is 20.9 kJ/mol.The sorption behavior of D401 for Gd(Ⅲ) obeys the Freundlich isotherm. The sorption enthalpy change △ H 0 is 19.6 kJ/mol. Coordination molar ratio of the functional group of D401 to Gd(Ⅲ) is 3 ∶1.The sorption mechanism shows that the oxygen and nitrogen atoms of the functional group of D401 coordinated with Gd(Ⅲ) to form coordination bond.