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Studies on the Coordination Behavior and Stability of Fluorine–Cerium Complex Ions in Sulfuric Acid Solution System: Studies on the Coordination Behavior and Stability of Fluorine–Cerium Complex Ions in Sulfuric Acid Solution System: Lai, Lan, Huang, Liu, Yang, Nie, and Zhang

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Title: Studies on the Coordination Behavior and Stability of Fluorine–Cerium Complex Ions in Sulfuric Acid Solution System: Studies on the Coordination Behavior and Stability of Fluorine–Cerium Complex Ions in Sulfuric Acid Solution System: Lai, Lan, Huang, Liu, Yang, Nie, and Zhang
Authors: Lai, Pengfei1 (AUTHOR), Lan, Qiaofa2 (AUTHOR), Huang, Long1 (AUTHOR), Liu, Shuaifeng1 (AUTHOR), Yang, Youming1,2,3 (AUTHOR), Nie, Huaping1 (AUTHOR), Zhang, Xiaolin1 (AUTHOR) userlin116@126.com
Source: JOM: The Journal of The Minerals, Metals & Materials Society (TMS). May2025, Vol. 77 Issue 5, p3187-3196. 10p.
Subjects: Thermodynamics, Complex ions, Complexation reactions, Density functional theory, Acid solutions
Abstract: Fluorine and cerium easily form fluorine–cerium complex ions in extraction fluids, which change the separation coefficient between neighboring rare-earth elements and are very disadvantageous to rare-earth extraction and separation. On the basis of the traditional extraction process, to further elucidate the effect of fluorine–cerium complex ions on extraction performance, we performed density functional theory calculations and used the continuous variation and mole ratio methods to analyze the relevant structures and complexation behaviors of fluorine–cerium complex ions. The results showed that the configuration energy of [CeF2]2+ was the lowest and relatively stable. Complexation experiments involving the continuous variation and mole ratio methods verified that the F−-to-Ce4+ complexation ratio was approximately 2. The complexation reaction was carried out in the presence of CeF22+ with a complexation equilibrium constant β of 5.1658 × 1013. The complexation reaction of F− with Ce4+ reached equilibrium in 2 h. The thermodynamic properties of this fluorine–cerium complexation reaction were investigated, and ΔH > 0, ΔG < 0, and ΔS > 0 indicated that the complexation process was a spontaneous heat-absorption process. The experimental results provide theoretical guidance for the efficient extraction and separation of rare-earth elements and the efficient utilization of resources. [ABSTRACT FROM AUTHOR]
Copyright of JOM: The Journal of The Minerals, Metals & Materials Society (TMS) is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Fluorine and cerium easily form fluorine–cerium complex ions in extraction fluids, which change the separation coefficient between neighboring rare-earth elements and are very disadvantageous to rare-earth extraction and separation. On the basis of the traditional extraction process, to further elucidate the effect of fluorine–cerium complex ions on extraction performance, we performed density functional theory calculations and used the continuous variation and mole ratio methods to analyze the relevant structures and complexation behaviors of fluorine–cerium complex ions. The results showed that the configuration energy of [CeF2]2+ was the lowest and relatively stable. Complexation experiments involving the continuous variation and mole ratio methods verified that the F−-to-Ce4+ complexation ratio was approximately 2. The complexation reaction was carried out in the presence of CeF22+ with a complexation equilibrium constant β of 5.1658 &#215; 1013. The complexation reaction of F− with Ce4+ reached equilibrium in 2 h. The thermodynamic properties of this fluorine–cerium complexation reaction were investigated, and ΔH &gt; 0, ΔG &lt; 0, and ΔS &gt; 0 indicated that the complexation process was a spontaneous heat-absorption process. The experimental results provide theoretical guidance for the efficient extraction and separation of rare-earth elements and the efficient utilization of resources. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of JOM: The Journal of The Minerals, Metals &amp; Materials Society (TMS) is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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        Value: 10.1007/s11837-024-07060-w
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        Text: English
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        PageCount: 10
        StartPage: 3187
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      – SubjectFull: Thermodynamics
        Type: general
      – SubjectFull: Complex ions
        Type: general
      – SubjectFull: Complexation reactions
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      – SubjectFull: Density functional theory
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      – SubjectFull: Acid solutions
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      – TitleFull: Studies on the Coordination Behavior and Stability of Fluorine–Cerium Complex Ions in Sulfuric Acid Solution System: Studies on the Coordination Behavior and Stability of Fluorine–Cerium Complex Ions in Sulfuric Acid Solution System: Lai, Lan, Huang, Liu, Yang, Nie, and Zhang
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              Text: May2025
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