Enhanced adsorption to safe immobilization of cesium radionuclides

期刊论文
发表日期：

2024年10月4日

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Andrei Ivanets,
Irina Shashkova,
Natalja Kitikova,
Anastasiya Dzikaya,
Natalia Drozdova,
Ekaterina Zaruba-Venhlinskaya,
Artsiom Radkevich

摘要

Radionuclides removal and immobilization are crucial issue for liquid radioactive waste management. Zr-Ca-Mg and Ti-Ca-Mg phosphates performance for Cs⁺ ions adsorption and immobilization was studied. Adsorption of stable Cs⁺ on composite phosphates was well described by Sips model and pseudo-second order kinetics. Zr-Ca-Mg samples had the highest Cs⁺ adsorption capacity (< 2.40 mmol/g) compared to Ti-Ca-Mg phosphates (< 2.18 mmol/g). The samples with high Ti and Zr content were characterized by enhanced efficiency of ¹³⁷Cs radionuclide adsorption (K_d > 10⁴ mL/g) in wide range pH of 4.0–10.0. Metal phosphates calcined at 1000 °C shown the safe immobilization of Cs⁺ ions.

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