Improved photocatalysis of perfluorooctanoic acid in water and wastewater by Ga<inf>2</inf>O<inf>3</inf>/UV system assisted by peroxymonosulfate

Xu, B; Zhou, JL; Altaee, A; Ahmed, MB; Johir, MAH; Ren, J; Li, X

Improved photocatalysis of perfluorooctanoic acid in water and wastewater by Ga<inf>2</inf>O<inf>3</inf>/UV system assisted by peroxymonosulfate

Xu, B

Zhou, JL

Altaee, A

Ahmed, MB

Johir, MAH Ren, J Li, X

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Publication Type:: Journal Article
Citation:: Chemosphere, 2020, 239
Issue Date:: 2020-01-01

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Field	Value	Language
dc.contributor.author	Xu, B https://orcid.org/0000-0003-2854-3392	en_US
dc.contributor.author	Zhou, JL https://orcid.org/0000-0003-1393-1608	en_US
dc.contributor.author	Altaee, A https://orcid.org/0000-0001-9764-3974	en_US
dc.contributor.author	Ahmed, MB https://orcid.org/0000-0003-4756-595X	en_US
dc.contributor.author	Johir, MAH	en_US
dc.contributor.author	Ren, J	en_US
dc.contributor.author	Li, X	en_US
dc.date.available	2019-08-30	en_US
dc.date.issued	2020-01-01	en_US
dc.identifier.citation	Chemosphere, 2020, 239	en_US
dc.identifier.issn	0045-6535	en_US
dc.identifier.uri	http://hdl.handle.net/10453/135703
dc.description.abstract	© 2019 Elsevier Ltd Perfluorooctanoic acid (PFOA) has attracted considerable attention worldwide due to its widespread occurrence and environmental impacts. This research focused on the photocatalytic process for the treatment of PFOA in water and wastewater. Gallium oxide (Ga2O3) and peroxymonosulfate (PMS) were mixed directly in PFOA solution, which was irradiated under different light sources. The treatment system showed excellent performance that 100% PFOA was degraded within 90 min and 60 min under 254 nm and 185 nm UV irradiation, respectively. Moreover, the degradation efficacy was unaffected by initial PFOA concentration from 50 ng L−1 to 50 mg L−1. Acidic solution (pH 3) improved the degradation process. The quantum yield in the PMS/Ga2O3 system under UV light (254 nm) was estimated to be 0.009 mol E−1. Scavengers such as tert-butanol (t-BuOH), disodium ethylenediaminetetraacetate (EDTA-Na2) and benzoquinone (BQ) were added into PFOA solution to prove that sulfate radicals (SO4•–), superoxide radical (O2•–) and photogenerated electrons (e–) were the main active species with strong redox ability for PFOA degradation in PMS/Ga2O3/UV system. Combined with the intermediates analysis, PFOA was degraded stepwise from long chain compound to shorter chain intermediates. In addition, PFOA in real wastewater exhibited similar degradation efficiency, together with 75–85% TOC removal by Ga2O3/PMS under 254 nm UV irradiation. Therefore, Ga2O3/PMS system was highly effective for PFOA photodegradation under UV irradiation, which has potential to be applied for the perfluoroalkyl substances (PFAS) treatment in water and wastewater.	en_US
dc.relation.ispartof	Chemosphere	en_US
dc.relation.isbasedon	10.1016/j.chemosphere.2019.124722	en_US
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject.classification	Meteorology & Atmospheric Sciences	en_US
dc.subject.classification	Environmental Sciences	en_US
dc.subject.mesh	Peroxides	en_US
dc.subject.mesh	Superoxides	en_US
dc.subject.mesh	Gallium	en_US
dc.subject.mesh	Water	en_US
dc.subject.mesh	Edetic Acid	en_US
dc.subject.mesh	Caprylates	en_US
dc.subject.mesh	Fluorocarbons	en_US
dc.subject.mesh	Benzoquinones	en_US
dc.subject.mesh	Water Pollutants, Chemical	en_US
dc.subject.mesh	X-Ray Diffraction	en_US
dc.subject.mesh	Ultraviolet Rays	en_US
dc.subject.mesh	Water Purification	en_US
dc.subject.mesh	Oxidation-Reduction	en_US
dc.subject.mesh	Hydrogen-Ion Concentration	en_US
dc.subject.mesh	Photolysis	en_US
dc.subject.mesh	Waste Water	en_US
dc.title	Improved photocatalysis of perfluorooctanoic acid in water and wastewater by Ga<inf>2</inf>O<inf>3</inf>/UV system assisted by peroxymonosulfate	en_US
dc.type	Journal Article
utslib.citation.volume	239	en_US
pubs.embargo.period	Not known	en_US
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	2021-09-03T00:00:00+1000
pubs.publication-status	Published	en_US
pubs.volume	239	en_US

Abstract:

© 2019 Elsevier Ltd Perfluorooctanoic acid (PFOA) has attracted considerable attention worldwide due to its widespread occurrence and environmental impacts. This research focused on the photocatalytic process for the treatment of PFOA in water and wastewater. Gallium oxide (Ga2O3) and peroxymonosulfate (PMS) were mixed directly in PFOA solution, which was irradiated under different light sources. The treatment system showed excellent performance that 100% PFOA was degraded within 90 min and 60 min under 254 nm and 185 nm UV irradiation, respectively. Moreover, the degradation efficacy was unaffected by initial PFOA concentration from 50 ng L−1 to 50 mg L−1. Acidic solution (pH 3) improved the degradation process. The quantum yield in the PMS/Ga2O3 system under UV light (254 nm) was estimated to be 0.009 mol E−1. Scavengers such as tert-butanol (t-BuOH), disodium ethylenediaminetetraacetate (EDTA-Na2) and benzoquinone (BQ) were added into PFOA solution to prove that sulfate radicals (SO4•–), superoxide radical (O2•–) and photogenerated electrons (e–) were the main active species with strong redox ability for PFOA degradation in PMS/Ga2O3/UV system. Combined with the intermediates analysis, PFOA was degraded stepwise from long chain compound to shorter chain intermediates. In addition, PFOA in real wastewater exhibited similar degradation efficiency, together with 75–85% TOC removal by Ga2O3/PMS under 254 nm UV irradiation. Therefore, Ga2O3/PMS system was highly effective for PFOA photodegradation under UV irradiation, which has potential to be applied for the perfluoroalkyl substances (PFAS) treatment in water and wastewater.

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