Removal of Tetracycline Pollutants by Adsorption and Magnetic Separation Using Reduced Graphene Oxide Decorated with α-Fe2O3 Nanoparticles
| Autor: | Rodolfo Cruz-Silva, Adriana Magdalena Huízar-Félix, Jose Manuel Barandiaran, Azael Martínez Martínez-de la Cruz, Selene Sepulveda-Guzman, Celia Aguilar-Flores |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
General Chemical Engineering antibiotic contaminants Nanoparticle 02 engineering and technology 010501 environmental sciences 01 natural sciences law.invention lcsh:Chemistry symbols.namesake Adsorption law General Materials Science 0105 earth and related environmental sciences Nanocomposite Graphene Langmuir adsorption model Coercivity 021001 nanoscience & nanotechnology electrostatic interactions Chemical engineering lcsh:QD1-999 Remanence symbols 0210 nano-technology Hybrid material magnetic removal |
| Zdroj: | Nanomaterials, Vol 9, Iss 3, p 313 (2019) Nanomaterials Volume 9 Issue 3 |
| ISSN: | 2079-4991 |
| Popis: | Nanocomposites of reduced graphene oxide (RGO) with ferromagnetic &alpha 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 &alpha Fe2O3 nanoparticles distributed on the graphene surface. The adsorption kinetics show the presence of &alpha 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 &alpha 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 &alpha 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. |
| Databáze: | OpenAIRE |
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