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Environ Sci Pollut Res Int

Title:		Gaseous ethylbenzene removal by photocatalytic TiO(2) nanoparticles immobilized on glass fiber tissue under real conditions: evaluation of reactive oxygen species contribution to the photocatalytic process
Author(s):		Belkessa N; Serhane Y; Bouzaza A; Khezami L; Assadi AA;
Address:		"Univ Rennes, Ecole Nationale Superieure de Chimie de Rennes, CNRS, ISCR (Institut Des Sciences Chimiques de Rennes) - UMR 6226, 35000, Rennes, France. Department of Chemistry, Imam Mohammad Ibn Saud Islamic University (IMSIU), P.O. Box 5701, Riyadh, 11432, Saudi Arabia. Univ Rennes, Ecole Nationale Superieure de Chimie de Rennes, CNRS, ISCR (Institut Des Sciences Chimiques de Rennes) - UMR 6226, 35000, Rennes, France. aymen.assadi@ensc-rennes.fr"
Journal Title:		Environ Sci Pollut Res Int
Year:		2023
Volume:		20221220
Issue:		13
Page Number:		35745 - 35756
DOI:		10.1007/s11356-022-24636-8
ISSN/ISBN:		1614-7499 (Electronic) 0944-1344 (Linking)
Abstract:		"Photocatalytic oxidation (PCO) using a TiO(2) catalyst is an effective technique to remove gaseous volatile organic compounds (VOCs). Herein, a lab-scale continuous reactor is used to investigate the photocatalytic performance toward ethylbenzene (EB) vapor removal over TiO(2) nanoparticles immobilized on glass fiber tissue. The role of the reactive species in the removal of EB and the degradation pathway were studied. Firstly, the effect of key operating parameters such as EB concentration (13, 26, 60 mg/m(3)), relative humidity levels (From 5 to 80%), gas carrier composition (dry air + EB, O(2) + EB and N(2) + EB) and ultraviolet (UV) radiation wavelength (UV-A (365 nm), UV-C (254 nm)) were explored. Then, using superoxide dismutase and tert-butanol as trapping agents, the real contribution of superoxide radical anion (O(2)(.-)) and hydroxyl radicals (OH(.)) to EB removal was quantified. The results show that (i) small water vapor content enhances the EB degradation; (ii) the reaction atmosphere plays an important role in the photocatalytic process; and (iii) oxygen atmosphere/UV-C radiation shows the highest EB degradation percentage. The use of radical scavengers confirms the major contribution of the hydroxyl radical to the photocatalytic mechanism with 75% versus 25% for superoxide radical anion"
Keywords:		Reactive Oxygen Species *Superoxides Gases Titanium Ultraviolet Rays *Nanoparticles Catalysis Ethylbenzene Hydroxyl radical Photocatalysis Relative humidity Scavengers Superoxide radical anion TiO2;
Notes:		"MedlineBelkessa, Nacer Serhane, Youcef Bouzaza, Abdelkrim Khezami, Lotfi Assadi, Aymen Amin eng Germany 2022/12/21 Environ Sci Pollut Res Int. 2023 Mar; 30(13):35745-35756. doi: 10.1007/s11356-022-24636-8. Epub 2022 Dec 20"