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<p>Global water shortage and water pollution are severe. Nanofiltration membranes are used in the field of water treatment, but traditional nanofiltration membranes have problems such as low permeability flux and serious membrane pollution. This paper selects a kind of ionic liquid called 1-aminepropyl-3-methylimidazole bromine salt (AMIB) as an aqueous additive to prepare a modified nanofiltration membrane. The chemical structure of the film was characterized by ATR-FTIR, XPS and other means, and it was found that the crosslinking degree of the modified film was smaller than that of the initial film, and AMIB was successfully introduced; SEM and AFM observations showed that the modified film was looser, the polyamide layer was thinner, and the surface roughness was reduced; the water contact angle test showed that the surface hydrophilicity of the film was improved; the Zeta potential test showed that the modified film was negatively charged in a larger pH range. The separation performance test results show that while the modified membrane maintains a high retention rate for Na₂SO₄, the water flux is greatly increased, The water flux of the NF-AMIB-0.2 membrane reaches 75.96&#xa0;L·m⁻²·h⁻¹, which is 1.48 times higher than that of the unmodified membrane (51.24&#xa0;L·m⁻²·h⁻¹). The retention rate of Na₂SO₄ exceeds 98%, and the retention rate of salt follows the Na₂SO₄ &gt; MgSO₄ &gt; MgCl₂ &gt; NaCl, and has excellent long-term stability.</p>

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Preparation of high-performance nanofiltration membranes using functionalized ionic liquids and their performance

  • 期刊论文

  • 发表日期：

    2026年1月19日

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  • Shihao Bai,
  • Jingke Pei,
  • Fei Li,
  • Haotian Song,
  • Xu He,
  • Ran Hu,
  • Weijiao Jiang,
  • Jian Kang,
  • Yuanjie Li,
  • Ming Xiang

摘要

Global water shortage and water pollution are severe. Nanofiltration membranes are used in the field of water treatment, but traditional nanofiltration membranes have problems such as low permeability flux and serious membrane pollution. This paper selects a kind of ionic liquid called 1-aminepropyl-3-methylimidazole bromine salt (AMIB) as an aqueous additive to prepare a modified nanofiltration membrane. The chemical structure of the film was characterized by ATR-FTIR, XPS and other means, and it was found that the crosslinking degree of the modified film was smaller than that of the initial film, and AMIB was successfully introduced; SEM and AFM observations showed that the modified film was looser, the polyamide layer was thinner, and the surface roughness was reduced; the water contact angle test showed that the surface hydrophilicity of the film was improved; the Zeta potential test showed that the modified film was negatively charged in a larger pH range. The separation performance test results show that while the modified membrane maintains a high retention rate for Na₂SO₄, the water flux is greatly increased, The water flux of the NF-AMIB-0.2 membrane reaches 75.96 L·m⁻²·h⁻¹, which is 1.48 times higher than that of the unmodified membrane (51.24 L·m⁻²·h⁻¹). The retention rate of Na₂SO₄ exceeds 98%, and the retention rate of salt follows the Na₂SO₄ > MgSO₄ > MgCl₂ > NaCl, and has excellent long-term stability.