State Key Laboratory of Heavy Oil Processing, School of Materials Science and Engineering, China University of Petroleum, Qingdao, Shandong 266580, P. R. China.
ACS Appl Mater Interfaces. 2020 Nov 11;12(45):50962-50970. doi: 10.1021/acsami.0c11677. Epub 2020 Nov 3.
Designing and constructing a stable water-retention layer acting as the isolation between the oil and membrane surface holds great significance for solving the membrane fouling problems in oil/water separation, including common layered oil/water mixtures, immiscible oil-in-water emulsions, and even high-viscosity crude oil-in-water emulsions. Inspired by the self-cleaning property of sea urchin thorns, a bioinspired anti-oil-fouling hierarchically structured membranes decorated with urchin-like α-FeOOH particles was successfully prepared via the layer-by-layer (LBL) self-assembly method, maintaining numerous effective micro-nanopores. The hierarchical structured membrane exhibited superior superhydrophilicity/underwater superoleophobicity, high water-retention ability, and preferable anti-oil-fouling properties. Furthermore, the biomimetic membrane with controllable pore sizes could not only separate common layered oil/water mixtures but also effectively separate immiscible surfactant-stabilized oil-in-water emulsions of both low-viscosity crude oil and high-viscosity crude oil with an ultrahigh water flux up to 2598.4 L m h and an outstanding separation efficiency of 98.5%, revealing its promising prospect in oily wastewater treatment.
设计并构建一个稳定的持水层，作为油和膜表面之间的隔离层，对于解决膜污染问题具有重要意义，包括常见的层状油水混合物、不混溶的油包水乳状液，甚至是高粘度的原油包水乳状液。受海胆刺自清洁特性的启发，通过层层（LBL）自组装方法成功制备了具有仿刺状α-FeOOH 粒子的仿生抗油污染分级结构膜，保持了大量有效的微纳孔。该分级结构膜表现出优异的超亲水性/水下超疏油性、高持水能力和良好的抗油污染性能。此外，具有可控孔径的仿生膜不仅可以分离常见的层状油水混合物，而且可以有效地分离低粘度原油和高粘度原油的不混溶表面活性剂稳定的油包水乳状液，水通量高达 2598.4 L m h，分离效率高达 98.5%，显示出在含油废水处理方面的广阔前景。
