Electro-Enhanced Separation of Microsized Oil-in-Water Emulsions via Metallic Membranes: Performance and Mechanistic Insights

Conventional separation membranes suffer from evitable fouling and flux decrease for water treatment applications. Herein, a novel protocol of electro-enhanced membrane separation is proposed for the efficient treatment of microsized emulsions (∼1 μm) by rationally designing robust electroresponsive...

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Veröffentlicht in:Environmental science & technology 2022-04, Vol.56 (7), p.4518-4530
Hauptverfasser: Shi, Yongxuan, Zheng, Qifeng, Ding, Liujie, Yang, Fenglin, Jin, Wenbiao, Tang, Chuyang Y, Dong, Yingchao
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container_end_page 4530
container_issue 7
container_start_page 4518
container_title Environmental science & technology
container_volume 56
creator Shi, Yongxuan
Zheng, Qifeng
Ding, Liujie
Yang, Fenglin
Jin, Wenbiao
Tang, Chuyang Y
Dong, Yingchao
description Conventional separation membranes suffer from evitable fouling and flux decrease for water treatment applications. Herein, a novel protocol of electro-enhanced membrane separation is proposed for the efficient treatment of microsized emulsions (∼1 μm) by rationally designing robust electroresponsive copper metallic membranes, which could mitigate oil fouling and coenhance permeance (from ∼1026 to ∼2516 L·m–2·h–1·bar–1) and rejection (from ∼87 to ∼98%). High-flux Cu membranes exhibit superior ductility and electrical conductivity, enabling promising electroactivity. Separation performance and the fouling mechanism were studied under different electrical potentials and ionic strengths. Application of negative polarization into a large-pore (∼2.1 μm) Cu membrane is favorable to not only almost completely reject smaller-sized oil droplets (∼1 μm) but also achieve antifouling and anticorrosion functions. Moreover, surfactants around oil droplets might be redistributed due to electrostatic repulsion, which effectively enhances the steric hindrance effect between neighboring oil droplets, mitigating oil coalescence and consequently membrane fouling. Furthermore, due to the screening effect of surfactants, the presence of low-concentration salts increases the adsorption of surfactants at the oil–water interface, thus preventing oil coalescence via decreasing oil–water interfacial tension. However, under high ionic strengths, the fouling mechanism converts from cake filtration to a complete blocking model due to the reduced electrostatic repulsion between the Cu membrane and oil droplets. This work would provide mechanistic insights into electro-enhanced antifouling for not only oil emulsion separation but also more water treatment applications using rationally designed novel electroresponsive membranes.
doi_str_mv 10.1021/acs.est.2c00336
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source American Chemical Society Publications
subjects Antifouling
Antifouling substances
Coalescence
Coalescing
Copper
Corrosion prevention
Droplets
Ductility
Electrical conductivity
Electrical resistivity
Electroactivity
Emulsions
Fouling
Membrane processes
Membrane separation
Membranes
Oil
Salts
Separation
Steric hindrance
Surface tension
Surfactants
Treatment and Resource Recovery
Water treatment
title Electro-Enhanced Separation of Microsized Oil-in-Water Emulsions via Metallic Membranes: Performance and Mechanistic Insights
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