大孔膦酸树脂吸附铽的性能及其机理  

ADSORPTION BEHAVIORS AND MECHANISM OF MACROPOROUS PHOSPHONIC ACID RESIN FOR Tb(Ⅲ)

作　　者：吴香梅 熊春华 程德平[2] 

机构地区：[1]浙江丽水师专业化学系,浙江323000 [2]杭州大学化学系,浙江310028

出　　处：《铀矿冶》1997年第2期134-136,共3页Uranium Mining and Metallurgy

摘　　要：大孔膦酸树脂对Tb（Ⅲ）的吸附在HAc－NaAc缓冲体系中以pH为5．0最佳，树脂的静态和动态饱和吸附容量分别为252．8mg／g和239．4mg／g。用0．3mol／LHCl＋0．05mol／LNaCl溶液能定量洗脱。测得25℃时树脂吸附反应的表现速率常数K25c＝2．85×10－5／s；热力学参数西ΔH＝14．76kJ／mol、ΔG＝－40．51kJ／mol、ΔS＝185．5J／（mol·K）；配位摩尔比约为3：1（功能基：Tb（Ⅲ）。用化学和红外光谱等方法探讨了吸附机理。Tb(Ⅲ) is optimally adsorbed by macroporous phosphonic acid resin in the medium of pH=5.0(HAC-NaAc). The static and dynamic saturated adsorption capacity of the resin are 252. 8 mg Tb/g and 239. 4 mg Tb/g respectively- Tb(Ⅲ) adsorbed on macroporous phosphonic acid resin can be eluated by 0. 3 mol/L HCl+0.05 mol/L NaCl. The adsorption apparent rate constant is K25c = 2.85013310-5/s. The thermodynamics parameters are H=14. 76 kJ/mol, G=-40. 51kJ/mol and as = l85. 5 J/(mol. K). The coordination motar ratio of the resin (FG) to Tb3+ is 3: 1. The adsorption reaction conforms to Freundlich equation. The adsorption mechanism has been discussed by using chemical method and infrared spectrometry.

关 键 词：铽 大孔膦酸树脂 吸附机理 

分 类 号：O614.341[理学—无机化学]