亚胺基二乙酸树脂对镝的吸附及机理

BEHAVIOR AND MECHANISM OF Dy ADSORPTION WITH DIGLYCOLAMIDIC ACID RESIN

亚胺基二乙酸树脂 (D40 1)对镝 (Ⅲ )的吸附在 pH =5 73时最佳。静态饱和吸附容量为 183mg/ g(树脂 ) ,用 2 0mol·L- 1 HCl作解吸剂 ,解吸率为 95 5 % ,表观吸附速率常数k2 98=2 64× 10 - 5s- 1 ,表观吸附活化能Ea=2 5 6kJ·mol- 1 ;等温吸附服从Freundlich经验式 ;吸附热力学函数ΔH0 =18 0kJ·mol- 1 ;吸附机理表明D40 1功能基上的O与Dy3+ 发生配位键合 ,树脂功能基与镝 (Ⅲ )的配位摩尔比为 3∶1。

The Dy(Ⅲ)is quantitatively adsorbed by diglycolamidic acid resin(D401) in the medium of pH=5 73 The statically saturated sorption capacity is 183mg/g·resin The desorption rate is 95 5% by using the solution of 2 0mol·L -1 HCl as the desorbent The sorption rate constant k 298 =2 64×10 -5 s -1 ,and the apparent sorption activation energy of D401 for Dy(Ⅲ)is 25 6kJ·mol -1 The sorption behavior of D401 for Dy(Ⅲ)is consonant with the Freundlich isotherm equation The enthalpy change of sorption ΔH 0=18 0kJ·mol -1 Coordination molar ratio of the functional group of D401 to Dy(Ⅲ)is 3∶1. The sorption mechanism shows that the oxygen atoms in the functional group of D401 coordinated with Dy(Ⅲ)to form coordination bond