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<p>Precise ion sieving techniques are of great importance in various fields including the energy and environment. However, existing extraction methods, often associated with environmental risks, are lack of selectivity, time-consuming, and high cost. Here, we report a high-capacity sorbent made of polyacrylonitrile-chitosan composite spheres, capable of selectively adsorbing alkali or alkaline earth metal salts through controlled humidity levels, leveraging their distinct deliquescent humidity ranges. For lithium extraction specifically, this method demonstrates an extremely high adsorption capacity of 133.60 mg g<sup>-1</sup>, far above all existing adsorbents and sieves. Moreover, a rapid adsorption rate of 83.64 mg g<sup>-1</sup> h<sup>-1</sup> is achieved, with a high selectivity and a recovery rate. Crucially, this approach is heralded for its environmental friendliness, cost-efficiency, and low energy consumption.</p>

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Efficient cation separation based on humidity control and adsorption

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年11月26日

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  • Jinjiang Liang,
  • Xin Chen,
  • Changming Li,
  • Yining Zhang,
  • Jiahao Feng,
  • Chuxin Wu,
  • Yunqing Yang,
  • Ning Xue,
  • Xinshui Zhang,
  • Yihang Yang,
  • Tianyi Gao,
  • Ran Wei,
  • Jiameng Yu,
  • Xiangchen Hu,
  • Yue Zhang,
  • Yi Yu,
  • Wei Liu

摘要

Precise ion sieving techniques are of great importance in various fields including the energy and environment. However, existing extraction methods, often associated with environmental risks, are lack of selectivity, time-consuming, and high cost. Here, we report a high-capacity sorbent made of polyacrylonitrile-chitosan composite spheres, capable of selectively adsorbing alkali or alkaline earth metal salts through controlled humidity levels, leveraging their distinct deliquescent humidity ranges. For lithium extraction specifically, this method demonstrates an extremely high adsorption capacity of 133.60 mg g-1, far above all existing adsorbents and sieves. Moreover, a rapid adsorption rate of 83.64 mg g-1 h-1 is achieved, with a high selectivity and a recovery rate. Crucially, this approach is heralded for its environmental friendliness, cost-efficiency, and low energy consumption.