Zirconosilicate Sorbent Based on Waste Fly Ash Cenospheres for Cesium Immobilization in a Ceramic Form

IF 1.8 3区化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR

Russian Journal of Inorganic Chemistry Pub Date : 2024-10-29 DOI:10.1134/S0036023624602290

T. A. Vereshchagina, E. A. Kutikhina, O. V. Buyko, A. A. Belov, O. O. Shichalin, A. G. Anshits

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Abstract

Hollow aluminosilicate microspheres (cenospheres) of stabilized composition (glass phase, 95.4 wt %; (SiO₂/Al₂O₃)_glass, 3.1 wt %) isolated from coal combustion fly ashes were used to prepare composite sorbents containing a sorption-active component based on framework zirconosilicates. The synthesis products were characterized by X-ray powder diffraction (XRD), electron microscopy−energy-dispersive X-ray spectral analysis (SEM−EDX), and low-temperature nitrogen adsorption; their Cs⁺ sorption properties were studied. The prepared zirconosilicate material exhibits a high distribution coefficient in Cs⁺ sorption from aqueous solutions (ca. 10³–10⁴ mL/g) and a stable sorption capacity due to decationization. The usability of spark plasma sintering (SPS) technology to provide high-density mineral-like ceramics based on the zirconosilicate sorbent for cesium immobilization was investigated. Dilatometric, structural, and porosity analyses were performed for ceramics sintered at various temperatures (800–1000°C).

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废粉煤灰微球锆硅酸盐吸附剂陶瓷固载铯的研究

组成稳定的中空铝硅酸盐微球（玻璃相，95.4 wt %）；利用从燃煤飞灰中分离得到的（SiO2/Al2O3）玻璃（质量分数为3.1 wt %）制备了含有骨架型锆硅酸盐吸附活性组分的复合吸附剂。通过x射线粉末衍射（XRD）、电镜-能谱分析（SEM - EDX）和低温氮吸附对合成产物进行了表征；研究了它们的Cs+吸附性能。所制备的锆硅酸盐材料在水溶液中具有较高的Cs+吸附分布系数（约为103 ~ 104 mL/g），并且由于去离子化而具有稳定的吸附能力。研究了火花等离子烧结（SPS）技术在锆硅酸盐吸附剂基础上制备高密度类矿物陶瓷用于铯固定的可行性。在不同温度下（800-1000°C）烧结的陶瓷进行了膨胀、结构和孔隙率分析。

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来源期刊

Russian Journal of Inorganic Chemistry 化学-无机化学与核化学

CiteScore

3.10

自引率

38.10%

发文量

237

审稿时长

3 months

期刊介绍： Russian Journal of Inorganic Chemistry is a monthly periodical that covers the following topics of research: the synthesis and properties of inorganic compounds, coordination compounds, physicochemical analysis of inorganic systems, theoretical inorganic chemistry, physical methods of investigation, chemistry of solutions, inorganic materials, and nanomaterials.