In Situ-Generated Reactive Oxygen Species in Precharged Titania and Tungsten Trioxide Composite Catalyst Membrane Filters: Application to As(III) Oxidation in the Absence of Irradiation.

Park, J; Lim, J; Park, Y; Han, DS; Shon, HK; Hoffmann, MR; Park, H

In Situ-Generated Reactive Oxygen Species in Precharged Titania and Tungsten Trioxide Composite Catalyst Membrane Filters: Application to As(III) Oxidation in the Absence of Irradiation.

Park, J Lim, J Park, Y Han, DS Shon, HK Hoffmann, MR Park, H

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Publisher:: AMER CHEMICAL SOC
Publication Type:: Journal Article
Citation:: Environmental science & technology, 2020, 54, (15), pp. 9601-9608
Issue Date:: 2020-08

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Field	Value	Language
dc.contributor.author	Park, J
dc.contributor.author	Lim, J
dc.contributor.author	Park, Y
dc.contributor.author	Han, DS
dc.contributor.author	Shon, HK
dc.contributor.author	Hoffmann, MR
dc.contributor.author	Park, H
dc.date.accessioned	2021-02-13T20:05:40Z
dc.date.available	2021-02-13T20:05:40Z
dc.date.issued	2020-08
dc.identifier.citation	Environmental science & technology, 2020, 54, (15), pp. 9601-9608
dc.identifier.issn	0013-936X
dc.identifier.issn	1520-5851
dc.identifier.uri	http://hdl.handle.net/10453/146072
dc.description.abstract	This study demonstrates that in situ-generated reactive oxygen species (ROSs) in prephotocharged TiO<sub>2</sub> and WO<sub>3</sub> (TW) composite particle-embedded inorganic membrane filters oxidize arsenite (As(III)) into arsenate (As(V)) without any auxiliary chemical oxidants under ambient conditions in the dark. TW membrane filters have been charged with UV or simulated sunlight and subsequently transferred to a once-through flow-type system. The charged TW filters can transfer the stored electrons to dissolved O<sub>2</sub>, producing ROSs that mediate As(III) oxidation in the dark. Dramatic inhibition of As(V) production with O<sub>2</sub> removal or addition of ROS quenchers indicates an ROS-mediated As(III) oxidation mechanism. Electron paramagnetic spectroscopic analysis has confirmed the formation of the HO<sub>2</sub><sup>•</sup>/O<sub>2</sub><sup>•-</sup> pair in the dark. The WO<sub>3</sub> fraction in the TW filter significantly influences the performance of the As(III) oxidation, while As(V) production is enhanced with increasing charging time and solution pH. The As(III) oxidation is terminated when the singly charged TW filter is fully discharged; however, recharging of TW recovers the catalytic activity for As(III) oxidation. The proposed oxidation process using charged TW membrane filters is practical and environmentally benign for the continuous treatment of As(III)-contaminated water during periods of unavailability of sunlight.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	AMER CHEMICAL SOC
dc.relation	Qatar National Research FundNPRP10-1210-160019
dc.relation.ispartof	Environmental science & technology
dc.relation.isbasedon	10.1021/acs.est.0c01550
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Environmental Sciences
dc.subject.mesh	Oxides
dc.subject.mesh	Tungsten
dc.subject.mesh	Titanium
dc.subject.mesh	Reactive Oxygen Species
dc.subject.mesh	Oxidation-Reduction
dc.subject.mesh	Catalysis
dc.subject.mesh	Catalysis
dc.subject.mesh	Oxidation-Reduction
dc.subject.mesh	Oxides
dc.subject.mesh	Reactive Oxygen Species
dc.subject.mesh	Titanium
dc.subject.mesh	Tungsten
dc.title	In Situ-Generated Reactive Oxygen Species in Precharged Titania and Tungsten Trioxide Composite Catalyst Membrane Filters: Application to As(III) Oxidation in the Absence of Irradiation.
dc.type	Journal Article
utslib.citation.volume	54
utslib.location.activity	United States
utslib.for	090404 Membrane and Separation Technologies
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
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
utslib.copyright.status	closed_access	*
dc.date.updated	2021-02-13T20:05:14Z
pubs.issue	15
pubs.publication-status	Published
pubs.volume	54
utslib.citation.issue	15

Abstract:

This study demonstrates that in situ-generated reactive oxygen species (ROSs) in prephotocharged TiO₂ and WO₃ (TW) composite particle-embedded inorganic membrane filters oxidize arsenite (As(III)) into arsenate (As(V)) without any auxiliary chemical oxidants under ambient conditions in the dark. TW membrane filters have been charged with UV or simulated sunlight and subsequently transferred to a once-through flow-type system. The charged TW filters can transfer the stored electrons to dissolved O₂, producing ROSs that mediate As(III) oxidation in the dark. Dramatic inhibition of As(V) production with O₂ removal or addition of ROS quenchers indicates an ROS-mediated As(III) oxidation mechanism. Electron paramagnetic spectroscopic analysis has confirmed the formation of the HO₂^•/O₂^•- pair in the dark. The WO₃ fraction in the TW filter significantly influences the performance of the As(III) oxidation, while As(V) production is enhanced with increasing charging time and solution pH. The As(III) oxidation is terminated when the singly charged TW filter is fully discharged; however, recharging of TW recovers the catalytic activity for As(III) oxidation. The proposed oxidation process using charged TW membrane filters is practical and environmentally benign for the continuous treatment of As(III)-contaminated water during periods of unavailability of sunlight.

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http://hdl.handle.net/10453/146072