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Demulsification and separation of crude oil-in-water emulsion using superhydrophilic silica-based nanocomposite membranes.
- Source :
-
Colloids & Surfaces A: Physicochemical & Engineering Aspects . Jun2024, Vol. 691, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
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Abstract
- 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 SiO 2 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. [Display omitted] • Silica-based nanocomposite membrane for crude oil/water separation was fabricated. • The membrane exhibits underwater superoleophobicity and high separation efficiency. • The coalescence of oil droplets on the membrane fiber surface was observed in-situ. • The membrane shows great self-cleaning and ultralow crude oil-adhesion properties. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09277757
- Volume :
- 691
- Database :
- Academic Search Index
- Journal :
- Colloids & Surfaces A: Physicochemical & Engineering Aspects
- Publication Type :
- Academic Journal
- Accession number :
- 176718895
- Full Text :
- https://doi.org/10.1016/j.colsurfa.2024.133863