Journal
CHEMICAL ENGINEERING JOURNAL
Volume 374, Issue -, Pages 91-99Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.05.164
Keywords
Tetracycline removal; Magnetic carbon-alpha Fe/Fe3C; Electrostatic adsorption; Practical application
Categories
Funding
- National Natural Science Foundation of China, China [81773333, 51521006, 51378190, 51578223, 51608464]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-13R17]
- Natural Science Foundation of Hunan Province [2017JJ3291]
- Research Foundation of Education Bureau of Hunan Province, China [17B256]
- Key Research and Development Program of Hunan Province [2017SK2242]
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Efficient removal of tetracycline (TCN) from aqueous solution is important for water environment security. Herein, magnetic carbon-alpha Fe/Fe3C derived from metal-organic frameworks (MOFs) were synthesized by a carbonization method and used for TCN adsorption. The magnetic carbon-alpha Fe/Fe3C adsorbent was characterized by scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), thermal gravimetric analyzer (TGA), X-ray photoelectron spectrum (XPS) and vibrating sample magnetometer (VSM). The resultant magnetic carbon-alpha Fe/Fe3C exhibited outstanding TCN adsorption capacity (511.06 mg g(-1)) from aqueous solution due to its large specific surface area (171.72 m(2) g(-1)) and pore volume (0.31 cm(3) g(-1)), and abundant active adsorption sites. The main adsorption mechanisms were physisorption and chemisorption, including pore filling effect and electrostatic adsorption. Moreover, magnetic carbon-alpha Fe/Fe3C could remove TCN at low concentrations (< 5 mg L-1) in aqueous solution to a relatively low level, which was very significant for the actual application. The high absorbability and good reusability in real water samples insured the magnetic carbon-alpha Fe/Fe3C with great potential in practical application.
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