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<p>Extensive use of synthetic polymeric membranes for separating immiscible liquids is concerned with a significant drawback&#xa0;that their interaction with organic solvents can lead to deterioration of membrane and contamination&#xa0;of organic phase. Repeated exposure to solvents can cause the polymeric matrix to break down, compromising membrane integrity and potentially releasing harmful contaminants into the desired phase. This not only affects the efficacy of the separation process but also raises environmental and toxicity concerns. We fabricated a chitosan-layered cotton (cellulose) fabric as a renewable, eco-friendly separator for organic/aqueous phase extraction. The tunable surface chemistry of cotton and chitosan may provide an opportunity for efficient separation of said phases under diverse physicochemical conditions. Infrared spectroscopic analysis indicated effective molecular interactions&#xa0;occured in the precursors&#xa0;during samples preparation. The treated cotton fabric showed good porosity, water uptake, permeability, tensile and thermal properties. When used for phase separation, single-layer coated cotton fabric (with chitosan, 1.5%, w/w) could separate ≥ 98% (v/v) <i>n</i>-hexane from the <i>n</i>-hexane/water (50/50, v/v) mixture in a controlled chamber at 25&#xa0;°C, 1&#xa0;atm, and 65% RH. In the <i>n</i>-hexane/water system with a surfactant, the <i>n</i>-hexane separation efficiency was limited to ~ 91% (v/v). Thereby, the chitosan-coated cotton matrix may be employed for organic/aqueous phase separations.</p>

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Chitosan-coated cotton fabric for efficient n-hexane/water separation under different physicochemical conditions

  • 期刊论文

  • 发表日期：

    2026年1月22日

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  • Mina Hafeez,
  • Zulfiqar Ali Raza,
  • Amina Khan,
  • Sadia Latif,
  • Tazeen Riaz,
  • Zahid Rizwan

摘要

Extensive use of synthetic polymeric membranes for separating immiscible liquids is concerned with a significant drawback that their interaction with organic solvents can lead to deterioration of membrane and contamination of organic phase. Repeated exposure to solvents can cause the polymeric matrix to break down, compromising membrane integrity and potentially releasing harmful contaminants into the desired phase. This not only affects the efficacy of the separation process but also raises environmental and toxicity concerns. We fabricated a chitosan-layered cotton (cellulose) fabric as a renewable, eco-friendly separator for organic/aqueous phase extraction. The tunable surface chemistry of cotton and chitosan may provide an opportunity for efficient separation of said phases under diverse physicochemical conditions. Infrared spectroscopic analysis indicated effective molecular interactions occured in the precursors during samples preparation. The treated cotton fabric showed good porosity, water uptake, permeability, tensile and thermal properties. When used for phase separation, single-layer coated cotton fabric (with chitosan, 1.5%, w/w) could separate ≥ 98% (v/v) n-hexane from the n-hexane/water (50/50, v/v) mixture in a controlled chamber at 25 °C, 1 atm, and 65% RH. In the n-hexane/water system with a surfactant, the n-hexane separation efficiency was limited to ~ 91% (v/v). Thereby, the chitosan-coated cotton matrix may be employed for organic/aqueous phase separations.