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Abstract <p>Oil spills and organic solvent discharges pose serious ecological and environmental risks, necessitating the development of highly efficient oil/water separation materials. Herein, we designed and prepared a novel ultra-light aerogel, namely hydrophobic reduced graphene oxide/polyvinyl alcohol@carbon delignified wood aerogel (H-rGO/PVA@CDWA), for this purpose. In particular, we integrated a delignified wood aerogel with graphene oxide (GO) and PVA. Subsequent carbonisation at 500&#xa0;°C and treatment with methyltrichlorosilane yielded a material that could be recycled through combustion or extrusion. The H-rGO/PVA@CDWA retained the anisotropic three-dimensional pore structure of wood, exhibiting good mechanical properties and fire resistance. The material also showed considerable hydrophobicity (water contact angle = 139.42°) and excellent adsorption capacity towards various oils (6.5041–17.8426&#xa0;g/g). Notably, the material maintained a high adsorption capacity and satisfactory elasticity after 20 extrusion–adsorption cycles and 10 combustion–adsorption cycles. Furthermore, the material exhibited a high oil/water separation efficiency for various emulsions and a considerable capacity for continuous oil/water separation. The material preparation strategy proposed herein has broad application prospects for wood utilisation in oily wastewater treatment, oil pollution remediation and organic solvent recovery.</p> Graphical abstract <p></p>

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Ultralight and highly efficient wood carbon aerogel for oil/water separation: recyclable via compression and combustion

  • 期刊论文

  • 发表日期：

    2025年5月25日

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  • Wanqi Zhang,
  • Yu Bai,
  • Yiting Liu,
  • Fenbing Tao,
  • Xiaotao Zhang,
  • Ximing Wang

摘要

Abstract

Oil spills and organic solvent discharges pose serious ecological and environmental risks, necessitating the development of highly efficient oil/water separation materials. Herein, we designed and prepared a novel ultra-light aerogel, namely hydrophobic reduced graphene oxide/polyvinyl alcohol@carbon delignified wood aerogel (H-rGO/PVA@CDWA), for this purpose. In particular, we integrated a delignified wood aerogel with graphene oxide (GO) and PVA. Subsequent carbonisation at 500 °C and treatment with methyltrichlorosilane yielded a material that could be recycled through combustion or extrusion. The H-rGO/PVA@CDWA retained the anisotropic three-dimensional pore structure of wood, exhibiting good mechanical properties and fire resistance. The material also showed considerable hydrophobicity (water contact angle = 139.42°) and excellent adsorption capacity towards various oils (6.5041–17.8426 g/g). Notably, the material maintained a high adsorption capacity and satisfactory elasticity after 20 extrusion–adsorption cycles and 10 combustion–adsorption cycles. Furthermore, the material exhibited a high oil/water separation efficiency for various emulsions and a considerable capacity for continuous oil/water separation. The material preparation strategy proposed herein has broad application prospects for wood utilisation in oily wastewater treatment, oil pollution remediation and organic solvent recovery.

Graphical abstract