Removal of Cs(I) and Sr(II) from Liquid Media with Crystalline Titanosilicates Prepared by Hydrothermal Synthesis

IF 0.9 Q4 CHEMISTRY, INORGANIC & NUCLEAR

Radiochemistry Pub Date : 2024-03-12 DOI:10.1134/S1066362223070032

N. P. Ivanov, P. A. Marmaza, O. O. Shichalin, A. N. Dran’kov, V. L. Rastorguev, A. V. Marchenko, S. M. Pisarev, Ya. G. Zernov, A. Yu. Maiorov, A. N. Fedorets, E. K. Papynov

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Abstract

The water pollution with Cs⁺ and Sr²⁺ radionuclides in the nuclear fuel cycle is a pressing environmental problem. The selective adsorption of radionuclides onto inorganic sorbents of zeolite structure, exhibiting the ion-sieve effect, is a promising procedure for the treatment of the liquid radioactive waste formed. Titanosilicate of the CST structural type, corresponding to the formula Na_1.64H_0.36Ti₂O₃SiO₄(H₂O)_1.84, was prepared by hydrothermal synthesis performed at 190°С and a pressure of 1.3 MPa for 24 h. This sorbent allows efficient removal of the Cs⁺ and Sr²⁺ cations from liquid media. The sorption exchange capacity q_eq is 1.58 mg-equiv/g for Cs⁺ and 2.56 mg-equiv/g for Sr²⁺. Preliminary oxidation of Ti³⁺ to Ti⁴⁺ with H₂O₂ increases the sorption capacity for Cs⁺ and Sr²⁺. The phase composition, elemental composition, specific surface area, and pore size of the materials synthesized were determined. The titanosilicates obtained can be used as sorbents for liquid radioactive waste treatment.

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用水热合成法制备的结晶钛硅酸盐去除液体介质中的铯(I)和硒(II)

摘要核燃料循环中 Cs+ 和 Sr2+ 放射性核素造成的水污染是一个紧迫的环境问题。在具有沸石结构的无机吸附剂上对放射性核素进行选择性吸附，表现出离子筛效应，是处理所形成的液态放射性废物的一种很有前途的方法。通过在 190°С 和 1.3 兆帕压力下进行 24 小时的水热合成，制备出了 CST 结构类型的钛硅酸盐，其化学式为 Na1.64H0.36Ti2O3SiO4(H2O)1.84。Cs+ 的吸附交换容量 qeq 为 1.58 毫克当量/克，Sr2+ 的吸附交换容量 qeq 为 2.56 毫克当量/克。用 H2O2 将 Ti3+ 初步氧化成 Ti4+，可提高对 Cs+ 和 Sr2+ 的吸附容量。测定了合成材料的相组成、元素组成、比表面积和孔径。获得的钛硅酸盐可用作液态放射性废物处理的吸附剂。

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来源期刊

Radiochemistry CHEMISTRY, INORGANIC & NUCLEAR-

CiteScore

1.30

自引率

33.30%

发文量

期刊介绍： Radiochemistry is a journal that covers the theoretical and applied aspects of radiochemistry, including basic nuclear physical properties of radionuclides; chemistry of radioactive elements and their compounds; the occurrence and behavior of natural and artificial radionuclides in the environment; nuclear fuel cycle; radiochemical analysis methods and devices; production and isolation of radionuclides, synthesis of labeled compounds, new applications of radioactive tracers; radiochemical aspects of nuclear medicine; radiation chemistry and after-effects of nuclear transformations.