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<p>The discharge of oily industrial effluents and marine oil spills has caused serious contamination of water resources and poses long-term risks to human health. Therefore, developing low-cost, durable and environmentally benign separation materials is of great interest. In this study, a superhydrophobic paper membrane was fabricated via a stepwise dip-coating strategy, in which, polydopamine (PDA), boron nitride (BN) and a silica (SiO<sub>2</sub>)/octadecyl trichlorosilane (OTS) top layer were sequentially deposited&#xa0;onto cellulose paper. PDA first forms an adhesive interlayer on cellulose fibers, enabling the stable immobilization of BN platelets as a rigid two-dimensional scaffold. The&#xa0;subsequent deposition of SiO<sub>2</sub> and OTS generates a hierarchical micro/nanostructure with low surface energy, endowing the paper surface with superhydrophobic and oleophilic characteristics. The resulting PDA@BN@SiO<sub>2</sub>@OTS paper exhibits a water contact angle of about 165° and achieves oil–water separation efficiencies above 98% for various oil–water mixtures. Water-in-oil emulsions can also be separated with efficiencies up to 89.28%. The coating maintains an excellent hydrophobicity after 40 separation cycles and 40 sandpaper&#xa0;abrasion cycles, and shows good chemical stability after exposure to organic solvents, as well as acidic and alkaline solutions. Overall, this work demonstrates a simple and effective BN-assisted hierarchical coating design for constructing durable, multifunctional superhydrophobic paper for oil–water separation.</p> Graphical abstract <p></p>

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BN-assisted PDA/SiO2/OTS superhydrophobic paper with durable self-cleaning performance for oil–water separation

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Hexin Zhao,
  • Yan Jin,
  • Yao Meng,
  • Haoran Cheng,
  • Xingrong Zhang

摘要

The discharge of oily industrial effluents and marine oil spills has caused serious contamination of water resources and poses long-term risks to human health. Therefore, developing low-cost, durable and environmentally benign separation materials is of great interest. In this study, a superhydrophobic paper membrane was fabricated via a stepwise dip-coating strategy, in which, polydopamine (PDA), boron nitride (BN) and a silica (SiO2)/octadecyl trichlorosilane (OTS) top layer were sequentially deposited onto cellulose paper. PDA first forms an adhesive interlayer on cellulose fibers, enabling the stable immobilization of BN platelets as a rigid two-dimensional scaffold. The subsequent deposition of SiO2 and OTS generates a hierarchical micro/nanostructure with low surface energy, endowing the paper surface with superhydrophobic and oleophilic characteristics. The resulting PDA@BN@SiO2@OTS paper exhibits a water contact angle of about 165° and achieves oil–water separation efficiencies above 98% for various oil–water mixtures. Water-in-oil emulsions can also be separated with efficiencies up to 89.28%. The coating maintains an excellent hydrophobicity after 40 separation cycles and 40 sandpaper abrasion cycles, and shows good chemical stability after exposure to organic solvents, as well as acidic and alkaline solutions. Overall, this work demonstrates a simple and effective BN-assisted hierarchical coating design for constructing durable, multifunctional superhydrophobic paper for oil–water separation.

Graphical abstract