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采用静态吸附法研究了ASA-PGMA/SiO2对稀土离子的螯合吸附性能、吸附动力学和热力学。实验结果表明,其对稀土离子的吸附能力分别为:La3+:38.6 mg.g-1,Pr3+:39.6 mg.g-1,Nd3+:41.8 mg.g-1,Sm3+:42.8 mg.g-1,Tb3+:46.2 mg.g-1。吸附等温模型符合Lang-muir型单分子层吸附。介质pH值对材料的吸附能力有很大影响,pH值为6时吸附量最大。以盐酸为洗脱剂,当酸度为0.1 mol.L-1时,洗脱率为99.8%。连续吸附-脱附实验表明,ASA-PGMA/SiO2重复使用10次后,吸附能力变化很小。
Adsorption properties, adsorption kinetics and thermodynamics of ASA-PGMA / SiO2 for rare earth ions were studied by static adsorption method. The experimental results showed that the adsorption capacity of rare earth ions were: La3 +: 38.6 mg.g-1, Pr3 +: 39.6 mg.g-1, Nd3 +: 41.8 mg.g-1, Sm3 +: 42.8 mg.g- Tb3 +: 46.2 mg.g-1. The adsorption isotherm model conformed to Langmuir type monolayer adsorption. The pH value of the medium has a great influence on the adsorption capacity of the material, and the adsorption capacity is the largest at pH 6. With hydrochloric acid as eluent, when the acidity was 0.1 mol.L-1, the elution rate was 99.8%. Continuous adsorption - desorption experiments show that ASA-PGMA / SiO2 repeated use of 10 times, little change in adsorption capacity.