Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE This work presents a one-step solution blending and electrospinning strategy to fabricate F- SiO2/PVDF nanofiber membranes with uniform F- SiO2 dispersion. The membrane exhibits superhydrophobicity (water contact angle of 154.3°), high oil flux (3204 L·m−2·h−1), and excellent separation efficiency (99.67%) for oil–water mixtures, maintaining 96% efficiency after 40 cycles, demonstrating robust potential for treating oily wastewater.

ABSTRACT
With the acceleration of industrialization, oil spills and oily wastewater treatment have become global environmental challenges. Electrospun oil–water separation membranes have emerged as a research hotspot due to their high porosity, adjustable structure, and ease of modification. This study takes polyvinylidene fluoride (PVDF) as the base material, aiming to address the issues of uneven pore size distribution and pore collapse under high pressure difference in traditional electrospun PVDF membranes. SiO2 phase separators are introduced to regulate the structure of PVDF membranes. However, direct addition of SiO2 powder often leads to uneven dispersion due to the high viscosity of PVDF, reducing fiber uniformity and accelerating membrane clogging. To resolve this, this work proposes a one-step solution blending and electrospinning method using hydrophobic PVDF as the precursor, combined with 1H,1H,2H,2H-perfluorodecyltriethoxysilane (FAS) and SiO2 nanoparticles, to achieve a novel modified PVDF nanofiber membrane uniformly dispersed with surface fluorination modified SiO2 (F–SiO2). The modified membrane exhibits a water contact angle of 154.3°, and dynamic adsorption experiments demonstrate its adsorption capacity for n-hexane reaches 6.93 times the membrane weight. In oil–water separation experiments, the F- SiO2/PVDF nanofiber membrane achieves a high flux of 3204 L·m−2·h−1 and a separation efficiency of 99.67%, maintaining 96% efficiency after 40 cycles.