不溶性腐殖酸对钍(Ⅳ)的吸附性能

Adsorption Performance of Thorium(Ⅳ) by Insolubilized Humic Acid

通过批实验考察了不溶性腐殖酸（IHA）对水中钍（Th）的吸附行为,探讨了IHA投加量、吸附时间、pH、吸附温度等对吸附性能的影响,分析了吸附动力学、吸附等温线和热力学过程,利用SEM和FTIR分析了相关吸附机理。结果表明：30℃下,1.0 g/L的IHA在pH=3.5,吸附时间6 h时,对50 mg/L Th（Ⅳ）的去除率达到78.6%,温度越高,Th（Ⅳ）去除率越高。IHA对Th（Ⅳ）的吸附是自发吸热反应,符合Freundlich等温吸附模型和准二级动力学方程;IHA吸附Th（Ⅳ）的机理表现为离子交换和络合。

Adsorption of Th（Ⅳ） by insoluble humic acid（IHA） was investigated by batch technique.The IHA dosage,reaction time,pH value and adsorption temperature were varied step by step to study their influence on the adsorption of Th（Ⅳ）. Adsorption kinetics,isotherms and thermodynamics were done. Adsorption mechanics were also analyzed with scanning electron microscope（SEM） and Fourier transform infrared spectroscopy（FTIR）. The results showed that the removal rate reached 78. 6%under the conditions： initial concentration of Th（Ⅳ） 50 mg/L,pH value 3. 5,IHA dose 1. 0 g/L,temperature 30 ℃. And the equilibrium state was expected to achieve in approximately 6 hours. The higher the temperature,the higher Th（Ⅳ） removal rate. Thermodynamic analysis suggested that the adsorption reaction was a spontaneous endothermic reaction the adsorption process satisfied. Freundlich isotherms and the adsorption kinetics agreed with pseudo-second-order kinetic equation. The absorption of Th（Ⅳ） by IHA could be considered as ion exchange reaction and ion complexation reaction.