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

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 <i>Macadamia</i> activated carbon and explored as feas...

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Auteurs principaux:	Mpho Cynthia Qhubu, Philiswa Nosizo Nomngongo, Vusumzi Emmanuel Pakade
Format:	article
Langue:	EN
Publié:	MDPI AG 2021
Sujets:	adsorption activated carbon co-precipitation functionalization iron oxide chromium(VI) Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
Accès en ligne:	https://doaj.org/article/f402f003ed6e479cb6749af723c47013
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spelling	oai:doaj.org-article:f402f003ed6e479cb6749af723c470132021-11-11T19:56:43ZExploring the Iron Oxide Functionalized Biobased Carbon-silica-polyethyleneimine Composites for Hexavalent Chromium Removal from Dilute Aqueous Solutions10.3390/w132130812073-4441https://doaj.org/article/f402f003ed6e479cb6749af723c470132021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4441/13/21/3081https://doaj.org/toc/2073-4441The 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 <i>Macadamia</i> 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. Δ<i>G</i>° (−3 to −12 kJ/mol) and Δ<i>H</i>° (46, 12 and 5 kJ/mol) values affirmed that the adsorption of Cr(VI) was spontaneous and endothermic and dominated by chemical interactions.Mpho Cynthia QhubuPhiliswa Nosizo NomngongoVusumzi Emmanuel PakadeMDPI AGarticleadsorptionactivated carbonco-precipitationfunctionalizationiron oxidechromium(VI)Hydraulic engineeringTC1-978Water supply for domestic and industrial purposesTD201-500ENWater, Vol 13, Iss 3081, p 3081 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	adsorption activated carbon co-precipitation functionalization iron oxide chromium(VI) Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
spellingShingle	adsorption activated carbon co-precipitation functionalization iron oxide chromium(VI) Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 Mpho Cynthia Qhubu Philiswa Nosizo Nomngongo Vusumzi Emmanuel Pakade Exploring the Iron Oxide Functionalized Biobased Carbon-silica-polyethyleneimine Composites for Hexavalent Chromium Removal from Dilute Aqueous Solutions
description	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 <i>Macadamia</i> 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. Δ<i>G</i>° (−3 to −12 kJ/mol) and Δ<i>H</i>° (46, 12 and 5 kJ/mol) values affirmed that the adsorption of Cr(VI) was spontaneous and endothermic and dominated by chemical interactions.
format	article
author	Mpho Cynthia Qhubu Philiswa Nosizo Nomngongo Vusumzi Emmanuel Pakade
author_facet	Mpho Cynthia Qhubu Philiswa Nosizo Nomngongo Vusumzi Emmanuel Pakade
author_sort	Mpho Cynthia Qhubu
title	Exploring the Iron Oxide Functionalized Biobased Carbon-silica-polyethyleneimine Composites for Hexavalent Chromium Removal from Dilute Aqueous Solutions
title_short	Exploring the Iron Oxide Functionalized Biobased Carbon-silica-polyethyleneimine Composites for Hexavalent Chromium Removal from Dilute Aqueous Solutions
title_full	Exploring the Iron Oxide Functionalized Biobased Carbon-silica-polyethyleneimine Composites for Hexavalent Chromium Removal from Dilute Aqueous Solutions
title_fullStr	Exploring the Iron Oxide Functionalized Biobased Carbon-silica-polyethyleneimine Composites for Hexavalent Chromium Removal from Dilute Aqueous Solutions
title_full_unstemmed	Exploring the Iron Oxide Functionalized Biobased Carbon-silica-polyethyleneimine Composites for Hexavalent Chromium Removal from Dilute Aqueous Solutions
title_sort	exploring the iron oxide functionalized biobased carbon-silica-polyethyleneimine composites for hexavalent chromium removal from dilute aqueous solutions
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/f402f003ed6e479cb6749af723c47013
work_keys_str_mv	AT mphocynthiaqhubu exploringtheironoxidefunctionalizedbiobasedcarbonsilicapolyethyleneiminecompositesforhexavalentchromiumremovalfromdiluteaqueoussolutions AT philiswanosizonomngongo exploringtheironoxidefunctionalizedbiobasedcarbonsilicapolyethyleneiminecompositesforhexavalentchromiumremovalfromdiluteaqueoussolutions AT vusumziemmanuelpakade exploringtheironoxidefunctionalizedbiobasedcarbonsilicapolyethyleneiminecompositesforhexavalentchromiumremovalfromdiluteaqueoussolutions
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Exploring the Iron Oxide Functionalized Biobased Carbon-silica-polyethyleneimine Composites for Hexavalent Chromium Removal from Dilute Aqueous Solutions

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