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<p>Seawater desalination and wastewater purification from brackish water, shale gas extraction, and industrial processes remain vital but challenging. Membrane distillation offers a promising solution yet struggles with low flux, membrane fouling, and the permeation of volatile organic compounds alongside water vapor. Here, we introduce an omniphobic ZIF-8 composite membrane that traps volatile organic compounds under vacuum through crystal phase transitions and enhances water evaporation via linkage swing within hydrophobic micropores. This membrane, with a 92% ZIF-8 loading, fabricated through thermally induced phase separation, hot-pressing, and surface coating, can process over 38,000 L of water with 10 ppm contaminants per square meter without needing reactivation. Achieving a normalized flux of 71.8 L m<sup>–2</sup> h<sup>–1</sup> bar<sup>–1</sup>, it outperforms conventional membranes by fivefold in treating 10.5 wt% saline water, while maintaining excellent cyclic stability over 900 h and high anti-fouling properties. This work presents an effective approach for sustainable water purification.</p>

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High-flux and anti-fouling membrane distillation membrane with VOC capture ability enabled by ZIF-8

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年8月28日

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  • Dafei Sheng,
  • Xinlin Li,
  • Xin Huang,
  • Dou Ma,
  • Chao Sun,
  • Yuhao Zhu,
  • Xiaoqi Wang,
  • Zhipeng Wang,
  • Xiao Feng,
  • Shuang Zhao,
  • Bo Wang

摘要

Seawater desalination and wastewater purification from brackish water, shale gas extraction, and industrial processes remain vital but challenging. Membrane distillation offers a promising solution yet struggles with low flux, membrane fouling, and the permeation of volatile organic compounds alongside water vapor. Here, we introduce an omniphobic ZIF-8 composite membrane that traps volatile organic compounds under vacuum through crystal phase transitions and enhances water evaporation via linkage swing within hydrophobic micropores. This membrane, with a 92% ZIF-8 loading, fabricated through thermally induced phase separation, hot-pressing, and surface coating, can process over 38,000 L of water with 10 ppm contaminants per square meter without needing reactivation. Achieving a normalized flux of 71.8 L m–2 h–1 bar–1, it outperforms conventional membranes by fivefold in treating 10.5 wt% saline water, while maintaining excellent cyclic stability over 900 h and high anti-fouling properties. This work presents an effective approach for sustainable water purification.