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<p>One of the most challenging features of textile recycling is the widespread use of mixed fibre blends, which hardens the task of effective separation. A mixture of aqueous sodium hydroxide and a cosolvent was applied to a polycotton pre-consumer fabric to promote the chemical separation of polyester (PES) and cotton (CO). The feasibility of reusing the hydrolytic solutions was tested, where dimethyl sulfoxide (DMSO) and 2-propanol allowed the reusage of the hydrolytic solution for up to 3 consecutive cycles when applied to pristine material. The recovery of pure terephthalic acid (TPA), after treatment at 50&#xa0;°C followed by vacuum filtration, achieved yields ranging from 65 to 69%. No further purification was required in 75% of the tested conditions. Through this environmentally sustainable procedure, a method was proposed that could facilitate the development of a scalable process for the TPA recovery from polycotton textiles. This approach aims to reduce both textile waste production and the need for the <i>de novo</i> synthesis of TPA.</p>

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An Eco-friendly Approach for the Separation and Reusage of Pre-consumer Polycotton Textile Waste

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年1月30日

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  • Fábio Pedroso de Lima,
  • Cátia Alves,
  • Rita Gomes-Dias,
  • Marta Fernandes,
  • Bárbara Vieira,
  • Rui Rodrigues,
  • Jorge Padrão,
  • Andrea Zille

摘要

One of the most challenging features of textile recycling is the widespread use of mixed fibre blends, which hardens the task of effective separation. A mixture of aqueous sodium hydroxide and a cosolvent was applied to a polycotton pre-consumer fabric to promote the chemical separation of polyester (PES) and cotton (CO). The feasibility of reusing the hydrolytic solutions was tested, where dimethyl sulfoxide (DMSO) and 2-propanol allowed the reusage of the hydrolytic solution for up to 3 consecutive cycles when applied to pristine material. The recovery of pure terephthalic acid (TPA), after treatment at 50 °C followed by vacuum filtration, achieved yields ranging from 65 to 69%. No further purification was required in 75% of the tested conditions. Through this environmentally sustainable procedure, a method was proposed that could facilitate the development of a scalable process for the TPA recovery from polycotton textiles. This approach aims to reduce both textile waste production and the need for the de novo synthesis of TPA.