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<p>A facile two-step modification method using dodecyltrimethoxysilane (DTMS) was developed to fabricate a superhydrophobic wood sponge for oil–water separation from natural green renewable balsa wood. First, alkali treatment was performed on balsa wood to remove hemicellulose and lignin to obtain a rough surface and micron-sized pores, preparing flexible balsa wood (FBW). Second, DTMS was grafted onto the surface of FBW via solution impregnation to construct a micro/nano-coating, yielding a dodecyltrimethoxysilane decorated wood sponge (DWS). The DWS surface exhibited a high water contact angle (WCA) of 150.5°, confirming its superhydrophobicity. DWS demonstrated effective oil absorption from oil–water mixtures. Scanning electron microscopy revealed that FBW possessed an interconnected three-dimensional porous network, enabling DWS to achieve high absorption capacities of 12–31&#xa0;g&#xa0;g<sup>−1</sup>for various oils and organic reagents. After 10 cycles, the absorption capacity remained stable, and the WCA was maintained at 143.2°, indicating excellent recyclability. This two-step modification method requires only 5 h of alkali treatment and 2&#xa0;h of DTMS grafting, and balsa wood is a natural renewable resource. This study provides a potential strategy for developing superhydrophobic materials to address crude oil spills and sewage pollution.</p>

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Sustainable and recyclable superhydrophobic wood sponge by alkali-silylation modification for high-capacity oil–water separation

  • 期刊论文

  • 发表日期：

    2025年10月23日

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  • Kejiangnan Meng,
  • Hongwu Wu,
  • Chenxing Zhang,
  • Lei Han

摘要

A facile two-step modification method using dodecyltrimethoxysilane (DTMS) was developed to fabricate a superhydrophobic wood sponge for oil–water separation from natural green renewable balsa wood. First, alkali treatment was performed on balsa wood to remove hemicellulose and lignin to obtain a rough surface and micron-sized pores, preparing flexible balsa wood (FBW). Second, DTMS was grafted onto the surface of FBW via solution impregnation to construct a micro/nano-coating, yielding a dodecyltrimethoxysilane decorated wood sponge (DWS). The DWS surface exhibited a high water contact angle (WCA) of 150.5°, confirming its superhydrophobicity. DWS demonstrated effective oil absorption from oil–water mixtures. Scanning electron microscopy revealed that FBW possessed an interconnected three-dimensional porous network, enabling DWS to achieve high absorption capacities of 12–31 g g−1for various oils and organic reagents. After 10 cycles, the absorption capacity remained stable, and the WCA was maintained at 143.2°, indicating excellent recyclability. This two-step modification method requires only 5 h of alkali treatment and 2 h of DTMS grafting, and balsa wood is a natural renewable resource. This study provides a potential strategy for developing superhydrophobic materials to address crude oil spills and sewage pollution.