Arsenic adsorption onto aluminium-substituted goethite

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Environmental contextGoethite, commonly found in soils, is often partially substituted by Al and strongly influences the mobility of arsenic in the environment. The adsorption of AsV onto goethites with increasing Al substitution was explored, finding that Al incorporation decreases AsV sorption per...

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Autores principales: Tufo, A.E., Dos Santos Afonso, M., Sileo, E.E.
Formato: JOUR
Materias:
Al-goethite
zeta potential.
acidity
adsorption
aluminum
arsenic
electrokinesis
goethite
mobility
pollutant
pollutant removal
stoichiometry
surface area
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_14482517_v13_n5_p838_Tufo
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_14482517_v13_n5_p838_Tufo2023-10-03T16:16:30Z Arsenic adsorption onto aluminium-substituted goethite Tufo, A.E. Dos Santos Afonso, M. Sileo, E.E. Al-goethite zeta potential. acidity adsorption aluminum arsenic electrokinesis goethite mobility pollutant pollutant removal stoichiometry surface area Environmental contextGoethite, commonly found in soils, is often partially substituted by Al and strongly influences the mobility of arsenic in the environment. The adsorption of AsV onto goethites with increasing Al substitution was explored, finding that Al incorporation decreases AsV sorption per gram of adsorbent, and that a low level of Al incorporation enhances the adsorption per unit area. Structures of the complexes formed between AsV and the oxy(hydr)oxide surface, at different pH values, are proposed by studying the changes in the surface charges of the adsorbed and non-adsorbed substituted and non-substituted goethites. AbstractAluminium and iron oxy(hydr)oxides in nature are often partially substituted by other elements and strongly influence the mobility of arsenic in the environment. Because goethite is commonly found in soils, and the oxide is easily substituted, in the present work, the adsorption of AsV onto several Al-substituted goethites was explored in order to determine how substitution affects the adsorption process. Three samples with increasing Al content (GAl0, GAl3.78 and GAl7.61) were prepared and fully characterised. The variations in AsV adsorption under different conditions, as well as the variations of the particle surface charge, were analysed. The results showed that the removal capacity of Al-goethites is determined by the Al content. The adsorption maxima per gram followed the trend GAl0> GAl3.78> GAl7.61, indicating that Al incorporation decreases AsV sorption. Adsorption per surface area decreased in the order GAl3.78> GAl0> GAl7.61, implying that a small incorporation of Al enhances the adsorption properties of the surface. The stoichiometry of the probable surface complexes formed with the contaminant at different pH values is proposed, by analysis of all the experimental results obtained before and after AsV adsorption. These surface complexes were used to fit the experimental data with good agreement, and the formation and acidity constants were also estimated. © CSIRO 2016. Fil:Tufo, A.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Sileo, E.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_14482517_v13_n5_p838_Tufo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Al-goethite
zeta potential.
acidity
adsorption
aluminum
arsenic
electrokinesis
goethite
mobility
pollutant
pollutant removal
stoichiometry
surface area
spellingShingle Al-goethite
zeta potential.
acidity
adsorption
aluminum
arsenic
electrokinesis
goethite
mobility
pollutant
pollutant removal
stoichiometry
surface area
Tufo, A.E.
Dos Santos Afonso, M.
Sileo, E.E.
Arsenic adsorption onto aluminium-substituted goethite
topic_facet Al-goethite
zeta potential.
acidity
adsorption
aluminum
arsenic
electrokinesis
goethite
mobility
pollutant
pollutant removal
stoichiometry
surface area
description Environmental contextGoethite, commonly found in soils, is often partially substituted by Al and strongly influences the mobility of arsenic in the environment. The adsorption of AsV onto goethites with increasing Al substitution was explored, finding that Al incorporation decreases AsV sorption per gram of adsorbent, and that a low level of Al incorporation enhances the adsorption per unit area. Structures of the complexes formed between AsV and the oxy(hydr)oxide surface, at different pH values, are proposed by studying the changes in the surface charges of the adsorbed and non-adsorbed substituted and non-substituted goethites. AbstractAluminium and iron oxy(hydr)oxides in nature are often partially substituted by other elements and strongly influence the mobility of arsenic in the environment. Because goethite is commonly found in soils, and the oxide is easily substituted, in the present work, the adsorption of AsV onto several Al-substituted goethites was explored in order to determine how substitution affects the adsorption process. Three samples with increasing Al content (GAl0, GAl3.78 and GAl7.61) were prepared and fully characterised. The variations in AsV adsorption under different conditions, as well as the variations of the particle surface charge, were analysed. The results showed that the removal capacity of Al-goethites is determined by the Al content. The adsorption maxima per gram followed the trend GAl0> GAl3.78> GAl7.61, indicating that Al incorporation decreases AsV sorption. Adsorption per surface area decreased in the order GAl3.78> GAl0> GAl7.61, implying that a small incorporation of Al enhances the adsorption properties of the surface. The stoichiometry of the probable surface complexes formed with the contaminant at different pH values is proposed, by analysis of all the experimental results obtained before and after AsV adsorption. These surface complexes were used to fit the experimental data with good agreement, and the formation and acidity constants were also estimated. © CSIRO 2016.
format JOUR
author Tufo, A.E.
Dos Santos Afonso, M.
Sileo, E.E.
author_facet Tufo, A.E.
Dos Santos Afonso, M.
Sileo, E.E.
author_sort Tufo, A.E.
title Arsenic adsorption onto aluminium-substituted goethite
title_short Arsenic adsorption onto aluminium-substituted goethite
title_full Arsenic adsorption onto aluminium-substituted goethite
title_fullStr Arsenic adsorption onto aluminium-substituted goethite
title_full_unstemmed Arsenic adsorption onto aluminium-substituted goethite
title_sort arsenic adsorption onto aluminium-substituted goethite
url http://hdl.handle.net/20.500.12110/paper_14482517_v13_n5_p838_Tufo
work_keys_str_mv AT tufoae arsenicadsorptionontoaluminiumsubstitutedgoethite
AT dossantosafonsom arsenicadsorptionontoaluminiumsubstitutedgoethite
AT sileoee arsenicadsorptionontoaluminiumsubstitutedgoethite
_version_ 1807324493574569984

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