One-Stage Adsorption Treatment of Liquid Radioactive Wastes with Complex Radionuclide Composition
2020
Ivanets, Andrei | Kitikova, Natalja | Shashkova, Irina | Radkevich, Artsiom | Stepanchuk, Tatiana | Maslova, Marina | Mudruk, Natalya
The development of new materials and technologies for effective treatment of liquid radioactive waste is an urgent task. In present work, the novel Ti-Ca-Mg phosphate sorbents were developed. Sorbents were characterized by X-ray diffraction (XRD), Fourier transmittance infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and N₂ adsorption-desorption techniques. The influence of the chemical composition of mixed Ca-Mg-Ti phosphate sorbents and solution pH and the nature of the radionuclide on the sorption efficiency of ¹³⁷Cs, ⁸⁵Sr, and ⁶⁰Co radionuclides were determined. The obtained materials demonstrated excellent affinity towards ¹³⁷Cs, ⁸⁵Sr, and ⁶⁰Co radionuclides (Kd reached up to 10⁵ mL g⁻¹). For all Ti-Ca-Mg phosphates, an increase in the sorption efficiency of ¹³⁷Cs with an increase in the titanium content was observed. It was shown that the samples of Ti-Ca-Mg phosphates containing of 33–60 wt% titanium effectively removed ¹³⁷Cs, ⁹⁰Sr, and ⁶⁰Co radionuclides at pH 8.0–11.0. The prepared Ti-Ca-Mg phosphate sorbents are promising for one-stage treatment of aqueous solutions of complex composition from ¹³⁷Cs, ⁸⁵Sr, and ⁶⁰Co radionuclides and could be used for development of advanced technology for liquid radioactive waste treatment.
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