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Open AccessArticle

The Preparation and Characterization of MnFe2O4-Decorated Expanded Graphite for Removal of Heavy Oils from Water

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NTT Hi-Tech Institute, Nguyen Tat Thanh University, 755000 Ho Chi Minh City, Vietnam
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Faculty of Chemical Engineering, Ho Chi Minh City University of Food Industry, 705800 Ho Chi Minh City, Vietnam
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Institute of Fundamental and Applied Sciences, Duy Tan University, 700000 Ho Chi Minh City, Vietnam
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Center of Excellence for Green Energy and Environmental Nanomaterials, Nguyen Tat Thanh University, 755000 Ho Chi Minh City, Vietnam
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(12), 1913; https://doi.org/10.3390/ma12121913
Received: 1 April 2019 / Revised: 27 May 2019 / Accepted: 29 May 2019 / Published: 13 June 2019
Recently, many methods have been developed to efficiently eliminate oil spills due to its long-term harmful effects on marine life and human health. Expanded graphite (EG) has been considered as an excellent platform to remove contaminated oil from aqueous solution through a facile adsorption route. As an innovative approach, the decoration of magnetic components, namely, MnFe2O4, into graphite layers was taken into account for facilitating phase separation under magnetic field which resulted into an easy collection of the used adsorbents in a large scale. The expanded graphite/manganese ferrite composites were prepared from Vietnamese graphite flakes via a two-stage process. Characterization was performed using Scanning Electron Microscope (SEM), Fourier-Transform Infrared Spectroscopy (FTIR), X-Ray Powder Diffraction (XRD), Vibrating Sample Magnetometer (VSM), Energy-Dispersive X-ray (EDS), and nitrogen adsorption/desorption analysis. The adsorption behavior of EG-MnFe2O4 for widespread used heavy oils, including diesel oil and crude oil, was investigated under the effects of adsorption conditions, i.e., contact time, loaded oil dosage, and salinity of mixing oil and water. The obtained results showed successful incorporation of MnFe2O4 into graphite sheets and no considerable change on the worm-like structure of EG. The results also showed that incorporated manganese ferrites enhanced the magnetism EG up to 16 emu/g, which made the recovery of used adsorbent conveniently. The EG-MnFe2O4 adsorbents exhibited the strong adsorption ability toward diesel oil (32.20 ± 0.46 g DO/g EG) and crude oil (33.07 ± 0.33 g CO/g EG). In brief, EG-MnFe2O4 material provides a potential and promising platform with high performance for oil spill removal. View Full-Text
Keywords: expanded graphite; heavy oils; magnetic adsorbent; manganese ferrite; wastewater treatment expanded graphite; heavy oils; magnetic adsorbent; manganese ferrite; wastewater treatment
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Tuan Nguyen, H.D.; Nguyen, H.T.; Nguyen, T.T.; Le Thi, A.K.; Nguyen, T.D.; Phuong Bui, Q.T.; Bach, L.G. The Preparation and Characterization of MnFe2O4-Decorated Expanded Graphite for Removal of Heavy Oils from Water. Materials 2019, 12, 1913.

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