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<p>Oil adsorbents for mitigating oil spills and for industrial oil-water separation applications are in demand. MTMS-coated biochar-based PU sponge (MTMS-C-PU) is prepared using commercially available polyurethane (PU) sponge, soya chunk biochar (SCB) powder, and methyltrimethoxysilane (MTMS). MTMS coating acts as a binder and imparts high hydrophobicity and flame retardancy to the adsorbent. The soya chunk biochar (SCB) powder imparts microscopic/nanoscopic roughness to the skeletal structures of the pristine PU sponge, thereby increasing the overall hydrophobicity and adsorption capacity of the material. The superhydrophobic MTMS-C-PU, with a water contact angle of 160.2° ± 1.4°, exhibited good adsorption capacity in the range of 44-75 times its own mass for various oils and organic solvents, and can be recycled up to 20 times. MTMS-C-PU can be used for separating oil from oil-water mixtures and can be used for demulsifying oil in water-type emulsions very effectively. Biochar, a photothermally active additive, makes the MTMS-C-PU a photothermal adsorbent.</p>

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Superhydrophobic/Superoleophilic Oil Absorbing Flame-Retardant and Photothermally Active Biochar-Based Polyurethane Sponge

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • Thejus Manoj,
  • Shijo Thomas,
  • C. B. Sobhan

摘要

Oil adsorbents for mitigating oil spills and for industrial oil-water separation applications are in demand. MTMS-coated biochar-based PU sponge (MTMS-C-PU) is prepared using commercially available polyurethane (PU) sponge, soya chunk biochar (SCB) powder, and methyltrimethoxysilane (MTMS). MTMS coating acts as a binder and imparts high hydrophobicity and flame retardancy to the adsorbent. The soya chunk biochar (SCB) powder imparts microscopic/nanoscopic roughness to the skeletal structures of the pristine PU sponge, thereby increasing the overall hydrophobicity and adsorption capacity of the material. The superhydrophobic MTMS-C-PU, with a water contact angle of 160.2° ± 1.4°, exhibited good adsorption capacity in the range of 44-75 times its own mass for various oils and organic solvents, and can be recycled up to 20 times. MTMS-C-PU can be used for separating oil from oil-water mixtures and can be used for demulsifying oil in water-type emulsions very effectively. Biochar, a photothermally active additive, makes the MTMS-C-PU a photothermal adsorbent.