Magnetic Fe/FeC@C Nanoadsorbents for Efficient Cr (VI) Removal

Overview

Journal Int J Mol Sci

Publisher MDPI

Specialties Biochemistry
Chemistry
Molecular Biology

Date 2022 Dec 11

PMID 36499462

Authors

Laura Cervera-Gabalda

Cristina Gomez-Polo

Affiliations

Soon will be listed here.

Abstract

Magnetic carbon nanocomposites (α-Fe/FeC@C) synthesized employing fructose and FeO magnetite nanoparticles as the carbon and iron precursors, respectively, are analyzed and applied for the removal of Cr (VI). Initial citric acid-coated magnetite nanoparticles, obtained through the co-precipitation method, were mixed with fructose (weight ratio 1:2) and thermally treated at different annealing temperatures ( = 400, 600, 800, and 1000 °C). The thermal decomposition of the carbon matrix and the FeO reduction was followed by thermogravimetry (TGA) and Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction, Raman spectroscopy, SQUID magnetometry, and N adsorption-desorption isotherms. A high annealing temperature ( = 800 °C) leads to optimum magnetic adsorbents (high magnetization enabling the magnetic separation of the adsorbent from the aqueous media and large specific surface area to enhance the pollutant adsorption process). Cr (VI) adsorption tests, performed under weak acid environments (pH = 6) and low pollutant concentrations (1 mg/L), confirm the Cr removal ability and reusability after consecutive adsorption cycles. Physical adsorption (pseudo-first-order kinetics model) and multilayer adsorption (Freundlich isotherm model) characterize the Cr (VI) absorption phenomena and support the enhanced adsorption capability of the synthesized nanostructures.

Citing Articles

Enhancement of Mass Transfer Process for Photocatalytic Reduction in Cr(VI) by Electric Field Assistance.

Feng X, Lin Y, Gan L, Zhao K, Zhao X, Pan Q Int J Mol Sci. 2024; 25(5).

PMID: 38474082 PMC: 10931939. DOI: 10.3390/ijms25052832.

Magnetic carbon FeO nanocomposites synthesized via Magnetic Induction Heating.

Cervera-Gabalda L, Gomez-Polo C Sci Rep. 2023; 13(1):7244.

PMID: 37142677 PMC: 10160050. DOI: 10.1038/s41598-023-34387-2.

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