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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。
Adsorption of gadolinium (III) by iminodiacetic acid resin (D40 1) is best at pH = 5 .73. The static adsorption capacity of the resin was 1 81 mg / g, with 2. 0mol / LHCl as the desorbent, the desorption rate was 99.5% and the apparent adsorption rate constant (k2 98) = 2.1 × 10 -5 s -1 The adsorption activation energy (△ Ea) = 2 0. 9kJ / mol; the isothermal adsorption obeys Freundlich empirical formula; the adsorption thermodynamic function ΔH0 = 1 9.6kJ / mol; the adsorption mechanism indicates that O, N and Gd3 + Coordination bonding occurs, the resin functional groups and the amount of gadolinium (Ⅲ) coordination material ratio of 3: 1.