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<p>High-purity salt extraction from saline water through conventional processes is complex and environmentally unsustainable. Here we propose a diffusion-driven selective crystallization strategy for high-purity salt production directly from source water with mixed salts. The essence of the strategy lies in purposefully suppressing non-ion-selective transfer processes (for example, convection) to harness differences in ion diffusion, thereby directing the targeted ion to selectively move to the crystallization surface. As a proof of concept, a floating porous membrane evaporator was designed, which universally achieved high-purity salt production (&gt;99.10%) from saline water of mixed ions such as Na<sup>+</sup>/K<sup>+</sup>, Ba<sup>2+</sup>/K<sup>+</sup> and Mg<sup>2+</sup>/Li<sup>+</sup>. Furthermore, the practical application potential of the strategy was demonstrated by the evaporator, which, in the absence of any pre- and posttreatment, successfully produced high-purity NaCl crystals (99.36%) out of real seawater in just one step. This strategy opens a new horizon for precise ion separation and enriches the toolbox of high-purity salt production.</p>

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Diffusion-driven selective crystallization of high-purity salt through simple and sustainable one-step evaporation

  • 期刊论文

  • 发表日期：

    2025年8月8日

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  • Yang Liu,
  • Changting Wang,
  • Jinjuan Chen,
  • Canjie Lin,
  • Wenjie Kuang,
  • Yekai Lian,
  • Zhenle He,
  • Zhen Wang,
  • Jintong Lin,
  • Khaled Bin Bandar,
  • Saud Aldrees,
  • Mohammed Alhussaini,
  • Yifeng Shi,
  • Jianping Cao,
  • Bei Liu,
  • Yi Jiang,
  • Yetao Tang,
  • Hanchao Zhang,
  • Wenbin Wang,
  • Peng Wang

摘要

High-purity salt extraction from saline water through conventional processes is complex and environmentally unsustainable. Here we propose a diffusion-driven selective crystallization strategy for high-purity salt production directly from source water with mixed salts. The essence of the strategy lies in purposefully suppressing non-ion-selective transfer processes (for example, convection) to harness differences in ion diffusion, thereby directing the targeted ion to selectively move to the crystallization surface. As a proof of concept, a floating porous membrane evaporator was designed, which universally achieved high-purity salt production (>99.10%) from saline water of mixed ions such as Na+/K+, Ba2+/K+ and Mg2+/Li+. Furthermore, the practical application potential of the strategy was demonstrated by the evaporator, which, in the absence of any pre- and posttreatment, successfully produced high-purity NaCl crystals (99.36%) out of real seawater in just one step. This strategy opens a new horizon for precise ion separation and enriches the toolbox of high-purity salt production.