超亲水性
乳状液
膜
纳米复合材料
化学工程
材料科学
原油
色谱法
化学
润湿
复合材料
石油工程
工程类
生物化学
作者
Lang Xu,Jiawen Zhang,Teng Wang,Yingjie Cai,Feng Feng,Feng He,Lingmin Yi
标识
DOI:10.1016/j.colsurfa.2024.133863
摘要
Environmental concerns regarding long-time oil spills and oily wastewater discharges have drawn increasingly attention. But up to now, the separation of high-viscosity crude oil-in-water emulsions remains difficult, and the demulsification, aggregation and separation mechanisms of oil-in-water emulsions are still unclear. In this work, a facile strategy is reported to fabricate silica-based superhydrophilic or underwater superoleophobic nanocomposite glass fiber membrane (GFM) via surface grafting method at room temperature. The immobilized epoxy-functionalized SiO2 nanoparticles improve the roughness and decreased the pore size of GFM. The hydrophilic copolymers of acrylic acid and glycidyl methacrylate (P(AA-co-GMA)) are further grafted on the membrane to increase its hydrophilicity, thereby achieving durable and efficient separation of crude oil-in-water emulsion with a separation efficiency of 96.2 ± 0.4% and a flux of 4725 ± 62 L·m−2·h−1. Moreover, by an in-situ observation of oil droplets on the membrane fiber surface, the demulsification of oil-water emulsions and the coalescence of small oil droplets are discovered when the oil-in-water emulsions flowed through the superhydrophilic fiber surface. Owing to the great demulsification capability, the as-prepared nanocomposite GFM is endowed with excellent crude oil-in-water emulsion separation performances.
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