Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials, Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery, College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China.
Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials, Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery, College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China.
Int J Biol Macromol. 2023 Dec 31;253(Pt 7):127368. doi: 10.1016/j.ijbiomac.2023.127368. Epub 2023 Oct 13.
Recyclable, non-toxic, and degradable biological substrates contribute significantly to super-wetting surfaces. In this work, we prepared magnetic micro-nano super-hydrophobic surfaces through a robust solution with magnetic modified lignin particles as the supporting structure. A novel PDMS (polydimethylsiloxane)/magnetic lignin particle (lignin@FeO)/PDA sponge composite was fabricated. Through dopamine (DA) self-polymerization, covalent deposition of magnetic lignin (ML), and PDMS silane modification, the magnetic super-hydrophobic polyurethane sponge composite (Sponge-P) was synthesized so that the FeO nanoscale microspheres wrapped with microscale lignin magnetic particles adhered to the sponge surface tighter and were barely dislodged. The as-prepared Sponge-P displayed excellent flexibility and a water contact angle of up to 152.2°. The super-hydrophobic sponge prepared with the proposed method was acid-base stable (pH = 2-12), self-cleaning, and suitable for high-salinity seawater. The magnetic super-hydrophobic sponge has good oil-water separation ability and can absorb 43 times its own weight of oil. In the meantime, due to the introduction of magnetic materials into lignin, we not only constructed micro-nanostructures to improve the surface super-hydrophobicity, but also made Sponge-P have the function of magnetic recovery, which has a unique advantage in treating oily wastewater.
可回收、无毒且可降解的生物基底对超润湿表面有重要贡献。在这项工作中，我们通过一种稳健的溶液制备了磁性微纳米超疏水表面，该溶液以磁性改性木质素颗粒作为支撑结构。制备了一种新型 PDMS（聚二甲基硅氧烷）/磁性木质素颗粒（木质素@FeO）/PDA 海绵复合材料。通过多巴胺（DA）自聚合、磁性木质素（ML）的共价沉积以及 PDMS 硅烷改性，合成了磁性超疏水聚氨酯海绵复合材料（Sponge-P），使得包裹有 FeO 纳米级微球的木质素磁性颗粒更紧密地附着在海绵表面上，几乎不会脱落。所制备的 Sponge-P 表现出优异的柔韧性和高达 152.2°的水接触角。采用所提出的方法制备的超疏水海绵具有酸碱稳定性（pH=2-12）、自清洁性，并且适用于高盐度海水。这种磁性超疏水海绵具有良好的油水分离能力，可吸收自身重量 43 倍的油。同时，由于将磁性材料引入木质素中，我们不仅构建了微纳米结构来提高表面超疏水性，还使 Sponge-P 具有磁性回收的功能，这在处理含油废水方面具有独特的优势。
