707阴离子交换树脂吸附铌的性能及动力学研究

Study on Adsorption Properties and Kinetics of Niobium with 707 Anion Exchange Resin

研究了707阴离子交换树脂从草酸溶液中吸附铌 草酸配合物的特性。试验结果表明,在[(NH4)2C2O4]=0 20mol/L,[K2S2O7]=0 030mol/L,[Nb]=8 0×10-5mol/L,pH=2 0条件下,铌的吸附率有最大值,测得Freundlish常数K=1 69×103,吸附速率常数k25℃=1 73×10-4s-1,吸附活化能Ea=22 1kJ/mol,树脂的饱和容量为每g干树脂123 2mg。

The adsorption properties of niobium oxalate complex in oxalic acid solution with 707 anion exchange resin have been investigated. The results show that the maximum adsorption amount occurs at [(NH4)2C2O4] =0.20 mol/L,[K2S2O8]=0.030 mol/L and pH=2.0. The Freundlish constant is 1.69×103 , the absorption rate constant is 1.73×10-4s-1(25 ℃) and the absorption activation energy Ea=22.1 kJ/mol as well as the saturate absorption capacity of resin is 123.2 mg per gram dryresin.