Removal of U(VI) and Th(IV) from aqueous solutions by organically modified diatomaceous earth: Evaluation of equilibrium, kinetic and thermodynamic data
Slam I.Y. Salameh , Fawwaz I. Khalili , Ammar H. Al-Dujaili
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引用次数: 38
Abstract
Raw and organically modified diatomaceous earth were used to remove U(VI) and Th(IV) ions from aqueous solution using the batch method. Effects of contact times, dosage of adsorbent, pH, ionic strength and temperature on the adsorption process were studied. The results indicated that the adsorption of these ions was affected by pH and ionic strength. The adsorption isotherms fit the Langmuir, Freundlich and D–R models at different temperature. The kinetic results revealed that pseudo-second-order kinetic model provided the best description of the equilibrium data. Thermodynamic parameters showed the adsorption process was spontaneous and endothermic. The best recovery for U(VI) was obtained when 1.0 M EDTA was used as eluent, while for Th(IV) ions when 1.0 M HNO3 was used.
以有机改性硅藻土和生硅藻土为原料，采用间歇法对水溶液中的U(VI)和Th(IV)离子进行了脱除。研究了接触次数、吸附剂用量、pH、离子强度和温度对吸附过程的影响。结果表明，对这些离子的吸附受pH和离子强度的影响。吸附等温线在不同温度下符合Langmuir、Freundlich和D-R模型。动力学结果表明，拟二阶动力学模型能较好地描述平衡数据。热力学参数表明，吸附过程为自发吸热吸附过程。以1.0 M EDTA为洗脱剂对U(VI)的回收率最高，以1.0 M HNO3为洗脱剂对Th(IV)的回收率最高。
期刊介绍：
International Journal of Mineral Processing has been discontinued as of the end of 2017, due to the merger with Minerals Engineering.
The International Journal of Mineral Processing covers aspects of the processing of mineral resources such as: Metallic and non-metallic ores, coals, and secondary resources. Topics dealt with include: Geometallurgy, comminution, sizing, classification (in air and water), gravity concentration, flotation, electric and magnetic separation, thickening, filtering, drying, and (bio)hydrometallurgy (when applied to low-grade raw materials), control and automation, waste treatment and disposal. In addition to research papers, the journal publishes review articles, technical notes, and letters to the editor..
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