writer：Fan Xiao, Ming Cao, Yingbo Chen*, Xiaofeng Lin
keywords：PAN nanofiber membrane; Oil-water separation; Wastewater purification
source：期刊
specific source：Separation and Purification Technology 380 (2026) 135462
Issue time：2026年

Separation and Purification Technology 380 (2026) 135462

DOI: 10.1016/j.seppur.2025.135462

Oil-contaminated wastewater, a pervasive byproduct of industrial processes, poses severe ecological threats, particularly surfactant-stabilized emulsions (SSEs) with high dispersion stability and resistance to conventional separation. Addressing this challenge demands innovative materials with superior separation efficacy. Electrospun nanofiber membranes, though promising, are often limited by low flux and poor durability. To address the issues, we presented an amidoxime functionalized UiO-66 (UiO-66-AO) mediated polyacrylonitrile (PAN) composite nanofiber membrane fabricated through a novel coaxial two-component electrospinning coupled with sacrificial template strategy. The membrane design utilized UiO-66-AO/PAN served as the shell-layer matrix, with polyvinylpyrrolidone (PVP) as a sacrificial core template. Subsequent the dissolution of PVP template created longitudinally aligned hollow groove structure, introducing rough surface while preserving structural integrity. Amidoxime modification enhanced the dispersion compatibility of UiO-66-AO within the PAN matrix, further improving the superhydrophilicity and implementing multi-level micro-nano rough structure of composite nanofibers. The synergistic effect of PVP template and UiO-66-AO promoted the generation of AO/PAN membranes with high separation area, excellent water-wetting property, and underwater superoleophobicity. The optimized 0.5% AO/PAN composite membrane delivered outstanding separation performance for different SSEs, achieving high flux of 9689.7 L·m?2·h?1 and good separation efficiency of 99.4% for petroleum ether/water SSE. Remarkably, after 20 separation cycles for n-hexane/water SSE, 0.5% AO/PAN retained the flux recovery capability of 84.44%, demonstrating superior anti-fouling capability and long-term durability. This work provides a robust strategy for fabricating high-performance nanofiber membranes through precise microstructure engineering and functional group modification, offering a promising solution for the treatment of challenging oily wastewater.