Repository of Research and Investigative Information

Repository of Research and Investigative Information

Zahedan University of Medical Sciences

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

(UNSPECIFIED) Remarkable reusability of magnetic Fe3O4-graphene oxide composite: a highly effective adsorbent for Cr(VI) ions. International Journal of Environmental Analytical Chemistry. p. 21. ISSN 0306-7319

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Abstract

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-Fe3O4 composite (Fe3O4-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 Fe3O4-GO. BET surface area of GO was 254.2 m(2)/g, but for Fe3O4-GO, it was decreased to 194.6 m(2)/g. From the experimentation, it was found that the best conditions were presented at 45 degrees C, 0.6 g/L, Fe3O4-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 Fe3O4-GO composite could be a promising material for the removal of Cr(VI) from wastewater.

Item Type: Article
Keywords: Cr(VI) Fe3O4-GO regeneration thermodynamics heavy-metal ions hexavalent chromium aqueous-solution activated carbon efficient removal adsorption equilibrium iron nanoparticles biosorption Chemistry Environmental Sciences & Ecology
Page Range: p. 21
Journal or Publication Title: International Journal of Environmental Analytical Chemistry
Journal Index: ISI
Identification Number: https://doi.org/10.1080/03067319.2021.1910250
ISSN: 0306-7319
Depositing User: مهندس مهدی شریفی
URI: http://eprints.zaums.ac.ir/id/eprint/5495

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