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Open AccessArticle

Removal of Emulsified Oil from Aqueous Environment by Using Polyvinylpyrrolidone-Coated Magnetic Nanoparticles

by 1,†, 1,†, 1,*, 2, 1 and 1
1
Institute of Environmental Materials and Applications, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
2
Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Water 2019, 11(10), 1993; https://doi.org/10.3390/w11101993
Received: 10 August 2019 / Revised: 14 September 2019 / Accepted: 19 September 2019 / Published: 24 September 2019
(This article belongs to the Section Wastewater Treatment and Reuse)
In recent years, a large amount of emulsified oily wastewaters were produced from petroleum and food industries, resulting in severe environmental problems. In this study, a series of polyvinylpyrrolidone (PVP)-coated Fe3O4 magnetic nanoparticles (MNPs) were prepared via one-step solvothermal method by introducing various amounts or types of PVP. The synthesized MNPs were characterized by multiple techniques, and their demulsification performances were evaluated in petrochemical and vegetable oil wastewaters, respectively. Results showed that the introduction of PVP in solvothermal process could significantly enhance the demulsification efficiency of MNPs, although excessive addition of PVP could not further increase its efficiency. Moreover, the effects of pH, surfactant concentration of wastewater, and the recycle number of MNPs on the demulsification performance were investigated in detail. It was found that the demulsification efficiency decreased with the increase of pH and surfactant concentration, and the synthetic MNPs were still effective after being reused for 5 cycles under acidic and neutral conditions. It is expected that the development of the PVP-coated MNPs can provide a simple and powerful route for the oily wastewater treatment. View Full-Text
Keywords: magnetic nanoparticles; polyvinylpyrrolidone; magnetic separation; demulsification performance; reusability magnetic nanoparticles; polyvinylpyrrolidone; magnetic separation; demulsification performance; reusability
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MDPI and ACS Style

Shao, S.; Li, Y.; Lü, T.; Qi, D.; Zhang, D.; Zhao, H. Removal of Emulsified Oil from Aqueous Environment by Using Polyvinylpyrrolidone-Coated Magnetic Nanoparticles. Water 2019, 11, 1993. https://doi.org/10.3390/w11101993

AMA Style

Shao S, Li Y, Lü T, Qi D, Zhang D, Zhao H. Removal of Emulsified Oil from Aqueous Environment by Using Polyvinylpyrrolidone-Coated Magnetic Nanoparticles. Water. 2019; 11(10):1993. https://doi.org/10.3390/w11101993

Chicago/Turabian Style

Shao, Shimin; Li, Yan; Lü, Ting; Qi, Dongming; Zhang, Dong; Zhao, Hongting. 2019. "Removal of Emulsified Oil from Aqueous Environment by Using Polyvinylpyrrolidone-Coated Magnetic Nanoparticles" Water 11, no. 10: 1993. https://doi.org/10.3390/w11101993

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