Adsorption and desorption behavior of arsenite and arsenate at river sediment-water interface.

Nguyen, KT; Navidpour, AH; Ahmed, MB; Mojiri, A; Huang, Y; Zhou, JL

Adsorption and desorption behavior of arsenite and arsenate at river sediment-water interface.

Nguyen, KT Navidpour, AH Ahmed, MB Mojiri, A Huang, Y

Zhou, JL

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Publisher:: ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Publication Type:: Journal Article
Citation:: J Environ Manage, 2022, 317, pp. 115497
Issue Date:: 2022-09-01

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Field	Value	Language
dc.contributor.author	Nguyen, KT
dc.contributor.author	Navidpour, AH
dc.contributor.author	Ahmed, MB
dc.contributor.author	Mojiri, A
dc.contributor.author	Huang, Y https://orcid.org/0000-0001-9800-8788
dc.contributor.author	Zhou, JL
dc.date.accessioned	2023-01-18T23:11:42Z
dc.date.available	2022-06-05
dc.date.available	2023-01-18T23:11:42Z
dc.date.issued	2022-09-01
dc.identifier.citation	J Environ Manage, 2022, 317, pp. 115497
dc.identifier.issn	0301-4797
dc.identifier.issn	1095-8630
dc.identifier.uri	http://hdl.handle.net/10453/165155
dc.description.abstract	The adsorption of inorganic arsenic (As) plays an important role in the mobility and transport of As in the river environment. In this work, the adsorption and desorption of arsenite [As(III)] and arsenate [As(V)] on river sediment were conducted under different pH, initial As concentrations, river water and sediment composition to assess As adsorption behavior and mechanism. Both adsorption kinetics and equilibrium results showed higher adsorption capacity of sediment for As(V) than As(III). Adsorption of As(III) and As(V) on river sediment was favored in acidic to neutral conditions and on finer sediment particles, while sediment organic matter marginally reduced adsorption capacity. In addition, higher adsorption affinity of As(III) and As(V) in river sediment was observed in deionised water than in river water. For the release process, the desorption of both As(III) and As(V) followed nonlinear kinetic models well, showing higher amount of As(III) release from sediment than As(V). Adsorption isotherm was well described by both Langmuir and Freundlich models, demonstrating higher maximum adsorption capacity of As(V) at 298.7 mg/kg than As(III) at 263.3 mg/kg in deionised water, and higher maximum adsorption capacity of As(III) of 234.3 mg/kg than As(V) of 206.2 mg/kg in river water. The XRD showed the changes in the peaks of mineral groups of sediment whilst FTIR results revealed the changes related to surface functional groups before and after adsorption, indicating that Fe-O/Fe-OH, Si(Al)-O, hydroxyl and carboxyl functional groups were predominantly involved in As(III) and As(V) adsorption on sediment surface. XPS analysis evidenced the transformation between these As species in river sediment after adsorption, whilst SEM-EDS revealed higher amount of As(V) in river sediment than As(III) due to the lower signal of Al.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
dc.relation.ispartof	J Environ Manage
dc.relation.isbasedon	10.1016/j.jenvman.2022.115497
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject.classification	Environmental Sciences
dc.subject.mesh	Adsorption
dc.subject.mesh	Arsenates
dc.subject.mesh	Arsenic
dc.subject.mesh	Arsenites
dc.subject.mesh	Hydrogen-Ion Concentration
dc.subject.mesh	Kinetics
dc.subject.mesh	Rivers
dc.subject.mesh	Water
dc.subject.mesh	Water Pollutants, Chemical
dc.subject.mesh	Water Purification
dc.subject.mesh	Arsenates
dc.subject.mesh	Arsenites
dc.subject.mesh	Arsenic
dc.subject.mesh	Water
dc.subject.mesh	Water Pollutants, Chemical
dc.subject.mesh	Rivers
dc.subject.mesh	Water Purification
dc.subject.mesh	Kinetics
dc.subject.mesh	Adsorption
dc.subject.mesh	Hydrogen-Ion Concentration
dc.title	Adsorption and desorption behavior of arsenite and arsenate at river sediment-water interface.
dc.type	Journal Article
utslib.citation.volume	317
utslib.location.activity	England
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	open_access	*
utslib.copyright.embargo	2024-09-01T00:00:00+1000Z
dc.date.updated	2023-01-18T23:11:41Z
pubs.publication-status	Published
pubs.volume	317

Abstract:

The adsorption of inorganic arsenic (As) plays an important role in the mobility and transport of As in the river environment. In this work, the adsorption and desorption of arsenite [As(III)] and arsenate [As(V)] on river sediment were conducted under different pH, initial As concentrations, river water and sediment composition to assess As adsorption behavior and mechanism. Both adsorption kinetics and equilibrium results showed higher adsorption capacity of sediment for As(V) than As(III). Adsorption of As(III) and As(V) on river sediment was favored in acidic to neutral conditions and on finer sediment particles, while sediment organic matter marginally reduced adsorption capacity. In addition, higher adsorption affinity of As(III) and As(V) in river sediment was observed in deionised water than in river water. For the release process, the desorption of both As(III) and As(V) followed nonlinear kinetic models well, showing higher amount of As(III) release from sediment than As(V). Adsorption isotherm was well described by both Langmuir and Freundlich models, demonstrating higher maximum adsorption capacity of As(V) at 298.7 mg/kg than As(III) at 263.3 mg/kg in deionised water, and higher maximum adsorption capacity of As(III) of 234.3 mg/kg than As(V) of 206.2 mg/kg in river water. The XRD showed the changes in the peaks of mineral groups of sediment whilst FTIR results revealed the changes related to surface functional groups before and after adsorption, indicating that Fe-O/Fe-OH, Si(Al)-O, hydroxyl and carboxyl functional groups were predominantly involved in As(III) and As(V) adsorption on sediment surface. XPS analysis evidenced the transformation between these As species in river sediment after adsorption, whilst SEM-EDS revealed higher amount of As(V) in river sediment than As(III) due to the lower signal of Al.

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