镍改性膨润土对137Cs和152+154Eu的吸附行为:动力学、等温线和色谱柱应用

IF 1.4 3区化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR Radiochimica Acta Pub Date : 2023-11-03 DOI:10.1515/ract-2023-0168

Mohamed R. Abass, Sara S. Mahrous, Muhammad S. Mansy

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引用次数: 0

摘要

摘要采用间歇和柱相结合的方法，研究了镍改性磷酸盐膨润土(BPN)对137 Cs和152+154 Eu的吸附行为。137cs的动力学数据服从伪-1阶，152eu的动力学数据服从伪-2阶。采用不同的吸附等温线模型对平衡数据进行分析。热力学函数反映了吸热自发吸附过程。HCl(95.35%)和cacl2(98.13%)分别是完全回收137 Cs和152+154 Eu的最佳洗脱剂。最后，柱数据表明，137cs和152+154 Eu可以负载在BNP吸附剂上，并使用不同浓度的HCl作为洗脱剂从水溶液中分离出来。结果表明，BNP吸附剂适用于低放射性废水中的137cs和152+154 Eu的回收。

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Sorption behaviour of ¹³⁷Cs and ^152+154Eu onto bentonite phosphate modified with nickel: kinetics, isotherms, and chromatographic column application

Abstract Using batch and column procedures, the present work investigated the sorption behaviour of 137 Cs and 152+154 Eu by bentonite phosphate modified with nickel (BPN) sorbent. The kinetic data obey pseudo-1 st -order for 137 Cs and follow pseudo-2 nd -order for 152+154 Eu. Various sorption isotherm models were used to analyze equilibrium data. The thermodynamic functions reflect an endothermic and spontaneous sorption process. HCl (about 95.35 %) and CaCl 2 (about 98.13 %) showed the optimum eluents for the complete recovery of both 137 Cs and 152+154 Eu, respectively. Finally, column data show that 137 Cs and 152+154 Eu may be loaded on BNP sorbent and separated from an aqueous solution using a variety of HCl concentrations as eluent. The obtianed results revealed that BNP sorbent is suitable for recovering 137 Cs and 152+154 Eu from low-level radioactive waste effluents (LLW).

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