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Exploring the Iron Oxide Functionalized Biobased Carbon-silica-polyethyleneimine Composites for Hexavalent Chromium Removal from Dilute Aqueous Solutions

1
Department of Chemistry, Faculty of Applied and Computer Sciences, Vaal University of Technology, Private Bag x 021, Vanderbijlpark 1900, South Africa
2
Department of Science and Innovation (DSI)/National Research Foundation (NRF) South African Research Chair Initiative (SARChI), Nanotechnology for Water, University of Johannesburg, Johannesburg 2711, South Africa
*
Author to whom correspondence should be addressed.
Academic Editor: Laura Bulgariu
Water 2021, 13(21), 3081; https://doi.org/10.3390/w13213081
Received: 26 August 2021 / Revised: 2 October 2021 / Accepted: 21 October 2021 / Published: 2 November 2021
The contamination of water resources by toxic hexavalent chromium remains a challenge. In this study, amino-functionalized iron oxide biobased carbon-silica composites were prepared through co-precipitation of Fe(II) and Fe(III) over Macadamia activated carbon and explored as feasible adsorbents for the removal of Cr(VI) from dilute aqueous solutions. The energy dispersive spectroscopy (EDS) elemental analysis confirmed the existence of Fe, Si, O, and C atoms, which form the backbone of the composite. The FTIR also showed the presence of Fe-O and Si-O-Si and Si-OH spectral bands, affirming the backbone of the adsorbents. Cr(VI) adsorption efficiency (5.76 mg/g) was achieved at pH 1 when an initial concentration of 2.5 mg/L, contact time of 90 min, and dosage concentration of 1.7 g/L were used. The data were best described by the Langmuir adsorption model and pseudo-second-order rate model. ΔG° (−3 to −12 kJ/mol) and ΔH° (46, 12 and 5 kJ/mol) values affirmed that the adsorption of Cr(VI) was spontaneous and endothermic and dominated by chemical interactions. View Full-Text
Keywords: adsorption; activated carbon; co-precipitation; functionalization; iron oxide; chromium(VI) adsorption; activated carbon; co-precipitation; functionalization; iron oxide; chromium(VI)
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MDPI and ACS Style

Qhubu, M.C.; Nomngongo, P.N.; Pakade, V.E. Exploring the Iron Oxide Functionalized Biobased Carbon-silica-polyethyleneimine Composites for Hexavalent Chromium Removal from Dilute Aqueous Solutions. Water 2021, 13, 3081. https://doi.org/10.3390/w13213081

AMA Style

Qhubu MC, Nomngongo PN, Pakade VE. Exploring the Iron Oxide Functionalized Biobased Carbon-silica-polyethyleneimine Composites for Hexavalent Chromium Removal from Dilute Aqueous Solutions. Water. 2021; 13(21):3081. https://doi.org/10.3390/w13213081

Chicago/Turabian Style

Qhubu, Mpho Cynthia, Philiswa Nosizo Nomngongo, and Vusumzi Emmanuel Pakade. 2021. "Exploring the Iron Oxide Functionalized Biobased Carbon-silica-polyethyleneimine Composites for Hexavalent Chromium Removal from Dilute Aqueous Solutions" Water 13, no. 21: 3081. https://doi.org/10.3390/w13213081

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