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Improved photocatalysis of perfluorooctanoic acid in water and wastewater by Ga2O3/UV system assisted by peroxymonosulfate.
Chemosphere. 2020 Jan; 239:124722.C

Abstract

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.

Authors+Show Affiliations

Centre for Green Technology, School of Civil and Environmental Engineering, University of Technology Sydney, 15 Broadway, NSW 2007, Australia; School of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China.Centre for Green Technology, School of Civil and Environmental Engineering, University of Technology Sydney, 15 Broadway, NSW 2007, Australia. Electronic address: junliang.zhou@uts.edu.au.Centre for Green Technology, School of Civil and Environmental Engineering, University of Technology Sydney, 15 Broadway, NSW 2007, Australia.Centre for Green Technology, School of Civil and Environmental Engineering, University of Technology Sydney, 15 Broadway, NSW 2007, Australia.Centre for Green Technology, School of Civil and Environmental Engineering, University of Technology Sydney, 15 Broadway, NSW 2007, Australia.Centre for Green Technology, School of Civil and Environmental Engineering, University of Technology Sydney, 15 Broadway, NSW 2007, Australia.School of Environmental and Chemical Engineering, Institute for the Conservation of Cultural Heritage, Shanghai University, Shanghai 200444, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31494318

Citation

Xu, Bentuo, et al. "Improved Photocatalysis of Perfluorooctanoic Acid in Water and Wastewater By Ga2O3/UV System Assisted By Peroxymonosulfate." Chemosphere, vol. 239, 2020, p. 124722.
Xu B, Zhou JL, Altaee A, et al. Improved photocatalysis of perfluorooctanoic acid in water and wastewater by Ga2O3/UV system assisted by peroxymonosulfate. Chemosphere. 2020;239:124722.
Xu, B., Zhou, J. L., Altaee, A., Ahmed, M. B., Johir, M. A. H., Ren, J., & Li, X. (2020). Improved photocatalysis of perfluorooctanoic acid in water and wastewater by Ga2O3/UV system assisted by peroxymonosulfate. Chemosphere, 239, 124722. https://doi.org/10.1016/j.chemosphere.2019.124722
Xu B, et al. Improved Photocatalysis of Perfluorooctanoic Acid in Water and Wastewater By Ga2O3/UV System Assisted By Peroxymonosulfate. Chemosphere. 2020;239:124722. PubMed PMID: 31494318.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Improved photocatalysis of perfluorooctanoic acid in water and wastewater by Ga2O3/UV system assisted by peroxymonosulfate. AU - Xu,Bentuo, AU - Zhou,John L, AU - Altaee,Ali, AU - Ahmed,Mohammad B, AU - Johir,Md Abu Hasan, AU - Ren,Jiawei, AU - Li,Xiaowei, Y1 - 2019/09/02/ PY - 2019/06/17/received PY - 2019/08/02/revised PY - 2019/08/30/accepted PY - 2019/9/9/pubmed PY - 2020/1/29/medline PY - 2019/9/9/entrez KW - PMS/Ga(2)O(3)/UV system KW - Perfluorooctanoic acid KW - Photocatalytic pathway KW - Quantum yield KW - Sulfate radicals SP - 124722 EP - 124722 JF - Chemosphere JO - Chemosphere VL - 239 N2 - 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. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/31494318/Improved_photocatalysis_of_perfluorooctanoic_acid_in_water_and_wastewater_by_Ga2O3/UV_system_assisted_by_peroxymonosulfate_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(19)31952-6 DB - PRIME DP - Unbound Medicine ER -