Song Dongsheng, An Congcong, Zhang Zhe, Qiu Yu, Zhao Zhimin, Zheng Dingqiang, Zhang Ming
Wood Material Science and Engineering Key Laboratory of Jilin Province, School of Material Science and Engineering, Beihua University, Jilin 132013, China.
Wood Material Science and Engineering Key Laboratory of Jilin Province, School of Material Science and Engineering, Beihua University, Jilin 132013, China.
Int J Biol Macromol. 2025 Aug;319(Pt 4):145685. doi: 10.1016/j.ijbiomac.2025.145685. Epub 2025 Jul 1.
A superhydrophobic CNF/PDA composite membrane has been developed to revolutionize oily wastewater treatment for achieving high efficiency, cost-effectiveness, and environmental sustainability. Inspired by the adhesive properties of mussels and the self-cleaning mechanism of lotus leaves, this innovative material is fabricated through a novel lyophilization and spray modification process using cellulose nanofibers (CNF), dopamine hydrochloride (DA), and octadecylamine (ODA). The membrane is synthesized via an aerobic, weakly alkaline self-polymerization process, which facilitates the formation of robust covalent and non-covalent bonds between the catecholamine structure of DA and CNF. ODA is integrated through hydrogen bonding and Schiff base reactions with polydopamine (PDA), enhancing structural stability. The resulting membrane demonstrates a tensile strength of 2.9 MPa, alongside exceptional separation efficiency (98.5 %) and flux rates (3745 L·m·h). Even after five consecutive water-in-oil (W/O) emulsion separation cycles, a separation efficiency exceeding 91.8 % is maintained, with hydrophobicity and structural integrity preserved. Durability tests confirm its robustness, with 98.5 % of initial capacity retained after ten adsorption-desorption cycles. The membrane's porous architecture and photothermal brown-black hue synergistically boost light-to-heat conversion, facilitating swift thermal response and efficient high-viscosity oil uptake. This demonstrates viable applications as a sustainable solution for oily wastewater treatment, promoting greener industrial application.
一种超疏水的CNF/PDA复合膜已被开发出来，旨在彻底改变含油废水处理方式，以实现高效、经济高效和环境可持续性。受贻贝的粘附特性和荷叶的自清洁机制启发，这种创新材料是通过一种新颖的冻干和喷雾改性工艺制备的，该工艺使用了纤维素纳米纤维（CNF）、盐酸多巴胺（DA）和十八烷基胺（ODA）。该膜通过需氧的弱碱性自聚合过程合成，这有助于在DA的儿茶酚胺结构和CNF之间形成牢固的共价键和非共价键。ODA通过与聚多巴胺（PDA）的氢键和席夫碱反应整合在一起，增强了结构稳定性。所得膜的拉伸强度为2.9MPa，同时具有出色的分离效率（98.5%）和通量率（3745L·m·h）。即使经过连续五个油包水（W/O）乳液分离循环，分离效率仍保持在91.8%以上，疏水性和结构完整性得以保留。耐久性测试证实了其坚固性，经过十次吸附-解吸循环后仍保留了98.5%的初始容量。该膜的多孔结构和光热棕黑色调协同促进光热转换，有助于快速的热响应和高效吸收高粘度油。这证明了其作为含油废水处理可持续解决方案的可行应用，促进了更绿色的工业应用。
