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Efficient electro-demulsification of O/W emulsions and simultaneous oil removal enabled by a multiscale porous biocarbon electrode
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- Wang, Kui (författare)
- College of Sciences, Henan Agricultural University, Nongye Road 63, 450002 Zhengzhou, China; Zhengzhou Public Utilities Investment Development Co., LTD, Shang Ding Road 89, 450016 Zhengzhou, China
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- Zhao, Hailiang (författare)
- School of Environmental Engineering, Henan University of Technology, Lianhua Street 100, 450001 Zhengzhou, China
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- Zhang, Yingming (författare)
- School of Environmental Engineering, Henan University of Technology, Lianhua Street 100, 450001 Zhengzhou, China
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- College of Sciences, Henan Agricultural University, Nongye Road 63, 450002 Zhengzhou, China; Zhengzhou Public Utilities Investment Development Co, LTD, Shang Ding Road 89, 450016 Zhengzhou, China School of Environmental Engineering, Henan University of Technology, Lianhua Street 100, 450001 Zhengzhou, China (creator_code:org_t)
- Elsevier BV, 2024
- 2024
- Engelska.
- Ingår i: Chemical Engineering Journal. - : Elsevier BV. - 1385-8947 .- 1873-3212. ; 481
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- Emulsion wastewater contain substantial amounts of oil and various additives, which pose threats to the environment and human health. Demulsification is a crucial pretreatment stage for wastewater. This study aims to identify a novel electro-demulsification method with high oil removal efficiency and low energy consumption. Modified carbonized birch wood with a unique isotropic multiscale pore structure is used as a self-standing electrode to treat a toluene oil-in-water (O/W) emulsion. The electrode must have a highly porous structure to facilitate efficient water diffusion and oil adsorption. It must also have high electronic conductivity to expedite polarized molecular electrophoresis to realize penetration into the pores and, subsequently, demulsification. Guided by an applied electric field force, polarized O/W droplets are drawn toward the electrode, revealing electrical characteristics distinct from those of polarized organic molecules. This electric field force augments the capture and adhesion of droplets by the electric double layer at the electrode interface. Consequently, adsorbed droplets in close proximity to the electrode rupture due to the combined influence of the electric field force and the electrostatic effects stemming from the electrode's multiscale porous structure. This synergistic action enables demulsification to occur efficiently at low energy consumption levels. This study has revealed that electro-demulsification can effectively treat toluene emulsions stabilized by various surfactants and microemulsion containing toluene. Therefore, this electro-demulsification technology can be further developed for various types of water pollution.
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Nyckelord
- Biomass
- Carbonized birch
- Electro-demulsification
- Low energy consumption
- Low voltage
- Multiscale pores structure
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- Jiang, Xiaolei
- Zhu, Xiuhong
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- Sheng, Xia
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