Removal of Tetracycline Pollutants by Adsorption and Magnetic Separation Using Reduced Graphene Oxide Decorated with α-Fe₂O₃ Nanoparticles

Nanomaterials
Adriana Magdalena Huízar-FélixRodolfo Cruz-Silva

Abstract

Nanocomposites of reduced graphene oxide (RGO) with ferromagnetic α-Fe₂O₃ nanoparticles have been prepared in-situ by thermal treatment. The structure and morphology of the hybrid material were studied by X-ray photoelectron spectroscopy, Raman, X-ray diffraction, and transmission electron microscopy. The results show a hybrid material highly modified with α-Fe₂O₃ nanoparticles distributed on the graphene surface. The adsorption kinetics show the presence of α-Fe₂O₃ nanoparticles on the RGO surface, and the amount of remaining functional groups dominated by ionization and dispersion. The adsorption kinetics of this adsorbent was characterized and found to fit the pseudo-second-order model. The α-Fe₂O₃ nanoparticles on RGO modify the electrostatic interaction of RGO layers and tetracycline, and adsorption properties decreased in the hybrid material. Adsorption isotherms fit with the Langmuir model very well, and the maximum capacity adsorption was 44.23 mg/g for RGO and 18.47 mg/g for the hybrid material. Magnetic characterization of the hybrid material shows ferromagnetic behavior due to the nanosize of α-Fe₂O₃ with a saturation magnetization, Ms = 7.15 Am²/kg, a remanence Mr = 2.29 Am²/kg, and a coercive field, Hc = 0.02 T.

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Citations

Jun 4, 2019·Environmental Science and Pollution Research International·Yu-Lim ChoiJae-Kyu Yang
May 19, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Thuan Van TranTrinh Duy Nguyen
Nov 20, 2020·The Science of the Total Environment·Longyao XuGuibin Jiang
Aug 7, 2021·Environmental Technology·Dariush NaghipourFatemeh Javan Mahjoub Doust
Mar 10, 2020·Journal of Environmental Management·Banhishikha DebnathDijendra Nath Roy
Jan 15, 2022·Environmental Science and Pollution Research International·Azadeh MehrdoostAli Akbar Babaei

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Methods Mentioned

BETA
electron microscopy
thermal treatment
X-ray
infrared spectroscopy
electron diffraction

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