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<p>Keratin was extracted from tannery hair waste using acoustic-cavitation process with ionic liquid (IL) offering an alternative to conventional chemical methods. Optimization of solid-to-liquid ratio, acoustic irradiation time and power yielded 71% keratin. This resulted in a 95% reduction in reaction time compared to conventional methods, indicating potential for reduced environmental impact. Characterization confirmed keratin structural integrity. ATR-FTIR, solid-state <sup>13</sup>C NMR and CD revealed intact secondary structures, XRD indicated crystalline order, and DSC/TGA showed thermal stability up to ~ 230&#xa0;°C. The IL was recovered, its structure verified by NMR and FTIR and reused up to five cycles. This approach contributes to advancements in resource efficiency, waste minimization and the development of sustainable biomaterials from discarded industrial waste.</p> Graphical abstract <p></p>

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Sustainable Valorization of Tannery Hair Waste into Keratin by an Acoustic Cavitation Process with Ionic Liquid

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Prasath Veerana Loganathan,
  • Nitin Prakash Lobo,
  • Surianarayanan Mahadevan,
  • Lajapathi Rai Chockalingam

摘要

Keratin was extracted from tannery hair waste using acoustic-cavitation process with ionic liquid (IL) offering an alternative to conventional chemical methods. Optimization of solid-to-liquid ratio, acoustic irradiation time and power yielded 71% keratin. This resulted in a 95% reduction in reaction time compared to conventional methods, indicating potential for reduced environmental impact. Characterization confirmed keratin structural integrity. ATR-FTIR, solid-state 13C NMR and CD revealed intact secondary structures, XRD indicated crystalline order, and DSC/TGA showed thermal stability up to ~ 230 °C. The IL was recovered, its structure verified by NMR and FTIR and reused up to five cycles. This approach contributes to advancements in resource efficiency, waste minimization and the development of sustainable biomaterials from discarded industrial waste.

Graphical abstract