Journal of Inorganic Materials

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Properties and Mechanism of U(VI) Removal by Calcium Orthovanadate

WANG Hongqin1,2, DENG Hao2, LIANG Hua1, TIAN Qiang1, YAN Minhao1, HUANG Yi1   

  1. 1. State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China;
    2. School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, China
  • Received:2025-01-07 Revised:2025-03-10
  • About author:WANG Hongqin (1999-), female, Master candidate. E-mail: 1523555457@qq.com
  • Supported by:
    Natural Science Foundation of Sichuan Province (2022JDTD0017)

Abstract: The mining process of natural uranium ore generates uranium-containing wastewater, and the removal of uranium(VI) from such wastewater has emerged as a critical challenge requiring urgent resolution in the nuclear industry. Guided by the principle of "from uranium mines, back to uranium mines," this study selected calcium orthovanadate (Ca3(VO4)2) as an adsorbent for U(VI) removal. The adsorption performance of Ca3(VO4)2 powder under varying conditions and its underlying mechanism were systematically investigated. Results demonstrated that under optimal conditions (pH 6, adsorption time=2 h, adsorbent dosage=0.1 g·L⁻¹, initial U(VI) mass concentration=120 mg·L⁻¹, temperature=308 K), Ca3(VO4)2 powder exhibited a high adsorption capacity (1179.92 mg·g⁻¹) and removal efficiency (98.33%) for U(VI). Removal mechanism was attributed to dissolution and mineralization processes, with the formation of metatyuyamunite (Ca(UO2)2(VO4)2·3H2O) on powder surface after adsorption. Even in the presence of six coexisting ions (Zn2+, Cr3+, Cu2+, Ni2+, Co2+, and Ba2+), Ca3(VO4)2 maintained high adsorption performance, reducing U(VI) mass concentration from 121.49 to 0.1 mg·L⁻¹, which is below the limit specified by the national discharge standard (GB 23727-2020). These findings highlight Ca3(VO4)2 as a promising adsorbent for efficient treatment of U(VI)-containing wastewater.

Key words: calcium orthovanadate, U(VI), adsorption capacity, removal rate, mineralization

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