Ag/Ag2O as a Co-Catalyst in TiO2 Photocatalysis: Effect of the Co-Catalyst/Photocatalyst Mass Ratio

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dc.identifier.uri http://dx.doi.org/10.15488/4912
dc.identifier.uri https://www.repo.uni-hannover.de/handle/123456789/4955
dc.contributor.author Akel, Soukaina
dc.contributor.author Dillert, Ralf
dc.contributor.author Balayeva, Narmina O.
dc.contributor.author Boughaled, Redouan
dc.contributor.author Koch, Julian
dc.contributor.author El Azzouzi, Mohammed
dc.contributor.author Bahnemann, Detlef W.
dc.date.accessioned 2019-05-31T07:44:51Z
dc.date.available 2019-05-31T07:44:51Z
dc.date.issued 2018
dc.identifier.citation Akel, S. et al.: Ag/Ag2O as a Co-Catalyst in TiO2 Photocatalysis: Effect of the Co-Catalyst/Photocatalyst Mass Ratio. In: Catalysts 8 (2018), Nr. 12, 647. DOI: https://doi.org/10.3390/catal8120647
dc.description.abstract Mixtures and composites of Ag/Ag2O and TiO2 (P25) with varying mass ratios of Ag/Ag2O were prepared, employing two methods. Mechanical mixtures (TM) were obtained by the sonication of a suspension containing TiO2 and Ag/Ag2O. Composites (TC) were prepared by a precipitation method employing TiO2 and AgNO3. Powder X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) confirmed the presence of Ag(0) and Ag2O. The activity of the materials was determined employing methylene blue (MB) as the probe compound. Bleaching of MB was observed in the presence of all materials. The bleaching rate was found to increase with increasing amounts of TiO2 under UV/vis light. In contrast, the MB bleaching rate decreased with increasing TiO2 content upon visible light illumination. XRD and XPS data indicate that Ag2O acts as an electron acceptor in the light-induced reaction of MB and is transformed by reduction of Ag+, yielding Ag(0). As a second light-induced reaction, the evolution of molecular hydrogen from aqueous methanol was investigated. Significant H-2 evolution rates were only determined in the presence of materials containing more than 50 mass% of TiO2. The experimental results suggest that Ag/Ag2O is not stable under the experimental conditions. Therefore, to address Ag/Ag2O as a (photo) catalytically active material does not seem appropriate. eng
dc.language.iso eng
dc.publisher Basel : MDPI
dc.relation.ispartofseries Catalysts 8 (2018), Nr. 12
dc.rights CC BY 4.0 Unported
dc.rights.uri https://creativecommons.org/licenses/by/4.0/
dc.subject photocatalysis eng
dc.subject silver(II) oxide eng
dc.subject titanium dioxide eng
dc.subject mechanical mixture eng
dc.subject in situ deposition eng
dc.subject hydrogen evolution eng
dc.subject.ddc 540 | Chemie ger
dc.title Ag/Ag2O as a Co-Catalyst in TiO2 Photocatalysis: Effect of the Co-Catalyst/Photocatalyst Mass Ratio eng
dc.type article
dc.type Text
dc.relation.essn 2073-4344
dc.relation.doi https://doi.org/10.3390/catal8120647
dc.bibliographicCitation.issue 12
dc.bibliographicCitation.volume 8
dc.bibliographicCitation.firstPage 647
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


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