Acid-resistant bismuth-doped antimony for effective Sr2+ adsorption in nitric acid solutions
- PMID: 40164422
- DOI: 10.1016/j.envres.2025.121476
Acid-resistant bismuth-doped antimony for effective Sr2+ adsorption in nitric acid solutions
Abstract
90Sr, a radioactive fission product in high-level liquid waste (HLLW), poses long-term environmental risks due to potential waterborne dispersion. A bismuth-doped Sb2O5 material (BiSb-0.1) was synthesized in this work to effectively remove strontium from simulated high-level liquid waste (HLLW). The maximum adsorption capacity attained 51.69 mg/g for Sr2+ in a 0.1 mol/L HNO3 solution. The adsorption data were well-fitted by the pseudo-second-order kinetic model and the Freundlich isotherm model. According to the thermodynamic parameters, the Sr2+ adsorption procedures are endothermic. Additionally, BiSb-0.1 demonstrated notable stability against γ-irradiation. Various characterization methods and DFT calculations have proved that the mechanism of Sr2+ adsorption is the exchange between Sr2+ and H+ in Sb-OH and the coordination between O atom and Sr2+.
Keywords: Adsorption; Antimony; Bismuth; High-level liquid waste; Strontium.
Copyright © 2025 Elsevier Inc. All rights reserved.
Conflict of interest statement
Declaration of competing interest The authors declare that the work presented in this study could not have been influenced by any known financial conflict of interest or personal relationship.
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