Abstract:

In recent years, owing to their advantages of being renewable and abundant, retaining unique multi-scale pore structure, and exhibiting excellent separation ability, reusability and biodegradability, biomass-based porous materials represented by collagen fibers have attracted much attention in the fields of oil-containing wastewater treatment. To address the problems of low oil-water separation efficiency of collagen fiber porous materials, a novel collagen fiber-based porous material with oil-water separation performance was prepared by modification of collagen fibers using a synergistic cross-linking system of tannic acid and metal ion (aluminum and zirconium) doped Laponite nanoplatelets. The results showed that the synergistic cross-linking system improved the self-standing, formability and porosity of the porous material without altering the triple-helix conformation of the collagen and stabilizing the collagen microstructures. Moreover, after the synergistic cross-linking modification, the shrinkage temperature, water contact angle and oil-water separation efficiency of the collagen fiber porous material network were increased to over 90℃, 98° and 68%, respectively, indicating that the thermal stability, hydrophobicity and oil-water separation properties were improved.

Key words: biomass, collagen fibers, porous materials, synergistic crosslinking, oil-water separation, nanomaterials

摘要：

以胶原纤维为代表的生物质基多孔材料因其具有可再生、储量丰富等特点且保留胶原纤维独特的多尺度孔隙结构以及具有优异的分离能力、可重复使用和可生物降解等优势，近年在含油废水处理等领域备受关注。针对胶原纤维多孔材料存在着油水分离效率低等问题，本文利用单宁酸与金属离子（铝和锆）掺杂锂藻土纳米片的协同交联体系来改性胶原纤维，制备了一种具有油水分离性能的胶原纤维基多孔材料。结果表明：该协同交联体系可提高胶原纤维多孔材料的自支撑性、成型性和多孔性，同时未改变胶原的三股螺旋构象并可起到稳定胶原微结构的作用；协同交联改性后胶原纤维多孔材料的收缩温度提升至90℃以上，接触角提升至98°以上，油水分离效率提升至68%以上，表明其热稳定性、疏水性以及油水分离性能均得以改善。

关键词: 生物质, 胶原纤维, 多孔材料, 协同交联, 油水分离, 纳米材料