Surface Complexation of Chromium(VI) on Iron(III) Hydroxide: Mechanisms and Stability Constants of Surfaces Complexes

The adsorption of chromate ions H2-yA (y = 1, 2, and A = CrO42–) on iron(III) hydroxide was conducted as a function of adsorbent mass, solution pH, and hydration time. The surface complexation technique, based on the examination of the chromate distribution between the solid and liquid phases, was a...

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Autores principales:	Mhamed Hmamou, Fatima Ezzahra Maarouf, Bouchaib Ammary, Abdelkebir Bellaouchou
Formato:	article
Lenguaje:	EN
Publicado:	Department of Chemistry, Universitas Gadjah Mada 2021
Materias:	chromium(vi) iron(iii) hydroxide adsorption surface complexes stability constants Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/17a285432ba74c2eaa34ac8dc9b1b23c
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spelling	oai:doaj.org-article:17a285432ba74c2eaa34ac8dc9b1b23c2021-12-02T15:02:41ZSurface Complexation of Chromium(VI) on Iron(III) Hydroxide: Mechanisms and Stability Constants of Surfaces Complexes1411-94202460-157810.22146/ijc.60634https://doaj.org/article/17a285432ba74c2eaa34ac8dc9b1b23c2021-02-01T00:00:00Zhttps://jurnal.ugm.ac.id/ijc/article/view/60634https://doaj.org/toc/1411-9420https://doaj.org/toc/2460-1578The adsorption of chromate ions H2-yA (y = 1, 2, and A = CrO42–) on iron(III) hydroxide was conducted as a function of adsorbent mass, solution pH, and hydration time. The surface complexation technique, based on the examination of the chromate distribution between the solid and liquid phases, was adopted to predict the adsorption mechanism. To specify stoichiometry of the chromate surface complexes, the proton (n > 0), and hydroxyl (n < 0) ion-exchange was evaluated at a pH range of 2–12. The obtained “n” values are ranging between -1 and 1. As a result, the sorption process involved specific chemical interaction with surface sites, resulting in 1H+ and 1OH– release of the adsorbate molecule. The surface species identified were ; ; ; ; ; ; ; and . The logarithmic values of their complexing constants were: log K00 = 1.81 ± 0.04; log K11 = -3.53 ± 0.07; log K21 = -1.03 ± 0.23, log K1-1 = 7.15 ± 0.14 and log K2-1 = 9.62 ± 0.53. The results showed that the chromate adsorption on Fe(III) hydroxide was of electrostatic and chemical nature at pH lower than 5.5, and only of chemical nature at pH superior to 5.5. Taking into account these considerations, Fe(III) hydroxide could be considered an excellent sorbent for the removal of Cr(VI) from wastewater solutions.Mhamed HmamouFatima Ezzahra MaaroufBouchaib AmmaryAbdelkebir BellaouchouDepartment of Chemistry, Universitas Gadjah Madaarticlechromium(vi)iron(iii) hydroxideadsorptionsurface complexesstability constantsChemistryQD1-999ENIndonesian Journal of Chemistry, Vol 21, Iss 3, Pp 679-689 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	chromium(vi) iron(iii) hydroxide adsorption surface complexes stability constants Chemistry QD1-999
spellingShingle	chromium(vi) iron(iii) hydroxide adsorption surface complexes stability constants Chemistry QD1-999 Mhamed Hmamou Fatima Ezzahra Maarouf Bouchaib Ammary Abdelkebir Bellaouchou Surface Complexation of Chromium(VI) on Iron(III) Hydroxide: Mechanisms and Stability Constants of Surfaces Complexes
description	The adsorption of chromate ions H2-yA (y = 1, 2, and A = CrO42–) on iron(III) hydroxide was conducted as a function of adsorbent mass, solution pH, and hydration time. The surface complexation technique, based on the examination of the chromate distribution between the solid and liquid phases, was adopted to predict the adsorption mechanism. To specify stoichiometry of the chromate surface complexes, the proton (n > 0), and hydroxyl (n < 0) ion-exchange was evaluated at a pH range of 2–12. The obtained “n” values are ranging between -1 and 1. As a result, the sorption process involved specific chemical interaction with surface sites, resulting in 1H+ and 1OH– release of the adsorbate molecule. The surface species identified were ; ; ; ; ; ; ; and . The logarithmic values of their complexing constants were: log K00 = 1.81 ± 0.04; log K11 = -3.53 ± 0.07; log K21 = -1.03 ± 0.23, log K1-1 = 7.15 ± 0.14 and log K2-1 = 9.62 ± 0.53. The results showed that the chromate adsorption on Fe(III) hydroxide was of electrostatic and chemical nature at pH lower than 5.5, and only of chemical nature at pH superior to 5.5. Taking into account these considerations, Fe(III) hydroxide could be considered an excellent sorbent for the removal of Cr(VI) from wastewater solutions.
format	article
author	Mhamed Hmamou Fatima Ezzahra Maarouf Bouchaib Ammary Abdelkebir Bellaouchou
author_facet	Mhamed Hmamou Fatima Ezzahra Maarouf Bouchaib Ammary Abdelkebir Bellaouchou
author_sort	Mhamed Hmamou
title	Surface Complexation of Chromium(VI) on Iron(III) Hydroxide: Mechanisms and Stability Constants of Surfaces Complexes
title_short	Surface Complexation of Chromium(VI) on Iron(III) Hydroxide: Mechanisms and Stability Constants of Surfaces Complexes
title_full	Surface Complexation of Chromium(VI) on Iron(III) Hydroxide: Mechanisms and Stability Constants of Surfaces Complexes
title_fullStr	Surface Complexation of Chromium(VI) on Iron(III) Hydroxide: Mechanisms and Stability Constants of Surfaces Complexes
title_full_unstemmed	Surface Complexation of Chromium(VI) on Iron(III) Hydroxide: Mechanisms and Stability Constants of Surfaces Complexes
title_sort	surface complexation of chromium(vi) on iron(iii) hydroxide: mechanisms and stability constants of surfaces complexes
publisher	Department of Chemistry, Universitas Gadjah Mada
publishDate	2021
url	https://doaj.org/article/17a285432ba74c2eaa34ac8dc9b1b23c
work_keys_str_mv	AT mhamedhmamou surfacecomplexationofchromiumvionironiiihydroxidemechanismsandstabilityconstantsofsurfacescomplexes AT fatimaezzahramaarouf surfacecomplexationofchromiumvionironiiihydroxidemechanismsandstabilityconstantsofsurfacescomplexes AT bouchaibammary surfacecomplexationofchromiumvionironiiihydroxidemechanismsandstabilityconstantsofsurfacescomplexes AT abdelkebirbellaouchou surfacecomplexationofchromiumvionironiiihydroxidemechanismsandstabilityconstantsofsurfacescomplexes
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Surface Complexation of Chromium(VI) on Iron(III) Hydroxide: Mechanisms and Stability Constants of Surfaces Complexes

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