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<p>The global energy transformation towards electrification and decarbonization urgently requires a sustainable lithium supply. However, current solvent extraction technology suffers from extractant dissolution and low efficiency. Herein, we develop an oil-in-water (O/W) Pickering emulsion with high stability using amphipathic SiO<sub>2</sub> nanoparticles to confine tributyl phosphate (TBP) extractant within the oil phase for enhancing lithium extraction from salt-lake brine. Resultantly, the Pickering emulsion achieves a lithium recovery of 91.7% with Li-Mg separation factor (<i>β</i><sup>Li</sup><sub>Mg</sub>) of 101.9 after only three-stage extraction and Li<sup>+</sup> mass transfer rate (<i>k</i>) of 4.57 × 10<sup>−8 </sup>m/s, greatly outperforming the traditional TBP system (52.8% recovery, <i>β</i><sup>Li</sup><sub>Mg</sub> = 12, <i>k</i> = 7.50 × 10<sup>−9 </sup>m/s). We propose that the tiny gaps between SiO<sub>2</sub> particles serve as Li<sup>+</sup> transport channels, in which the interfacial electric field generated by surface charges of SiO<sub>2</sub> particles and the confinement effect within these gaps synergistically enhance Li<sup>+</sup> dehydration and diffusion.</p>

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Lithium extraction by extractant confined in Pickering emulsion

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月14日

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  • Enze Li,
  • Zelong Li,
  • Qiancheng Xia,
  • Feiyu Zhang,
  • Zhangqi Liang,
  • Zhaozan Xu,
  • Guandao Gao,
  • Hu Li,
  • Fangqin Cheng

摘要

The global energy transformation towards electrification and decarbonization urgently requires a sustainable lithium supply. However, current solvent extraction technology suffers from extractant dissolution and low efficiency. Herein, we develop an oil-in-water (O/W) Pickering emulsion with high stability using amphipathic SiO2 nanoparticles to confine tributyl phosphate (TBP) extractant within the oil phase for enhancing lithium extraction from salt-lake brine. Resultantly, the Pickering emulsion achieves a lithium recovery of 91.7% with Li-Mg separation factor (βLiMg) of 101.9 after only three-stage extraction and Li+ mass transfer rate (k) of 4.57 × 10−8 m/s, greatly outperforming the traditional TBP system (52.8% recovery, βLiMg = 12, k = 7.50 × 10−9 m/s). We propose that the tiny gaps between SiO2 particles serve as Li+ transport channels, in which the interfacial electric field generated by surface charges of SiO2 particles and the confinement effect within these gaps synergistically enhance Li+ dehydration and diffusion.