A density functional theory study of arsenic immobilization by the Al(iii)-modified zeolite clinoptilolite

Awuah, Joel B., Dzade, Nelson ORCID: https://orcid.org/0000-0001-7733-9473, Tia, Richard, Adei, Evans, Kwakye-Awuah, Bright, Catlow, Charles Richard ORCID: https://orcid.org/0000-0002-1341-1541 and de Leeuw, Nora ORCID: https://orcid.org/0000-0002-8271-0545 2016. A density functional theory study of arsenic immobilization by the Al(iii)-modified zeolite clinoptilolite. Physical Chemistry Chemical Physics 18 (16) , pp. 11297-11305. 10.1039/C6CP00190D

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Abstract

We present density functional theory calculations of the adsorption of arsenic acid (AsO(OH)3) and arsenous acid (As(OH)3) on the Al(III)-modified natural zeolite clinoptilolite under anhydrous and hydrated conditions. From our calculated adsorption energies, we show that adsorption of both arsenic species is favorable (associative and exothermic) under anhydrous conditions. When the zeolite is hydrated, adsorption is less favourable, with the water molecules causing dissociation of the arsenic complexes, although exothermic adsorption is still observed for some sites. The strength of interaction of the arsenic complexes is shown to depend sensitively on the Si/Al ratio in the Al(III)-modified clinoptilolite, which decreases as the Si/Al ratio increases. The calculated large adsorption energies indicate the potential of Al(III)-modified clinoptilolite for arsenic immobilization.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Chemistry Advanced Research Computing @ Cardiff (ARCCA)
Subjects:	Q Science > QD Chemistry
Publisher:	Royal Society of Chemistry
ISSN:	1463-9076
Date of Acceptance:	21 March 2016
Last Modified:	01 Nov 2022 10:23
URI:	https://orca.cardiff.ac.uk/id/eprint/91307

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