Remarkable reusability of magnetic Fe3O4-graphene oxide composite: a highly effective adsorbent for Cr(VI) ions

The removal of Hexavalent Chromium (Cr (VI)) is a challenging task due to its acute toxicity even at low concentration. In the present study, graphene oxide-Fe 3 O 4 composite (Fe 3 O 4 -GO) was prepared and utilised for the removal of Cr(VI) from aqueous solution. Batch experiments were conducted t...

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Bibliographic Details
Published in:International journal of environmental analytical chemistry 2023-12, Vol.103 (15), p.3501-3521
Main Authors: Mahvi, Amir Hossein, balarak, davoud, Bazrafshan, Edris
Format: Article
Language:English
Subjects:
Acute toxicity
Adsorption
Analytical methods
Aqueous solutions
Chromium
Cr(VI)
Electron microscopy
Endothermic reactions
Fourier transforms
GO
Graphene
Hexavalent chromium
Infrared spectroscopy
Iron oxides
Kinetics
Magnetometers
regeneration
Removal
thermodynamics
Toxicity
Transmission electron microscopy
Wastewater
X-ray diffraction
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Summary:The removal of Hexavalent Chromium (Cr (VI)) is a challenging task due to its acute toxicity even at low concentration. In the present study, graphene oxide-Fe 3 O 4 composite (Fe 3 O 4 -GO) was prepared and utilised for the removal of Cr(VI) from aqueous solution. Batch experiments were conducted to investigate the influence of operating variables. Transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), vibrating sample magnetometer (VSM), and point zero charge (pH pzc ) were used to characterise the Fe 3 O 4 -GO. BET surface area of GO was 254.2 m 2 /g, but for Fe 3 O 4 -GO, it was decreased to 194.6 m 2 /g. From the experimentation, it was found that the best conditions were presented at 45°C, 0.6 g/L, Fe 3 O 4 -GO mass, PH = 2, concentration 10 mg/L, and contact time = 60 min with removal efficiencies above 99%. Analyses of Cr(VI) adsorption kinetics exhibited relatively rapid adsorption behaviour and obedience of the data from pseudo-second-order kinetics. The Langmuir model resulted in best fits to the adsorption isotherms for both linear and nonlinear models with maximum adsorption of 140.8 mg/g. The adsorption of Cr(VI) was an endothermic and spontaneous process. The removal efficiencies exhibited a moderate reduction in the maximum values (less than 6%) after six regeneration cycles. The Fe 3 O 4 -GO composite could be a promising material for the removal of Cr(VI) from wastewater.
ISSN:0306-7319
1029-0397
DOI:10.1080/03067319.2021.1910250