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Confirming the Formation of Hydroxyl Radicals in the Catalytic Decomposition of H2O2 on Metal Oxides Using Coumarin as a Probe
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Applied Physical Chemistry.ORCID iD: 0000-0002-4505-0920
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Applied Physical Chemistry.ORCID iD: 0000-0003-0663-0751
2019 (English)In: ChemCatChem, ISSN 1867-3880, E-ISSN 1867-3899, Vol. 11, no 22, p. 5435-5438Article in journal (Refereed) Published
Abstract [en]

Hydrogen peroxide can be catalytically decomposed to O-2 and H2O on metal oxide surfaces in contact with aqueous solutions containing H2O2. The initial step in this process has been proposed to be the formation of surface-bound hydroxyl radicals which has recently been verified using tris as a radical scavenger. Here, we make use of the unique fluorescent product 7-hydroxycoumarin formed in the reaction between hydroxyl radicals and coumarin to probe the formation of surface-bound hydroxyl radicals. The experiments clearly show that 7-hydroxycoumarin is formed upon catalytic decomposition of H2O2 in aqueous suspensions containing ZrO2-particles and coumarin, thereby confirming the formation of surface-bound hydroxyl radicals in this process. The results are quantitatively compared to results on the same system using tris as a probe for hydroxyl radicals. The effects of the two probes on the system under study are compared and it is concluded that coumarin has a significantly lower impact on the system.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2019. Vol. 11, no 22, p. 5435-5438
Keywords [en]
Hydrogen peroxide, Catalytic decomposition, Metal oxide, Surface-bound hydroxyl radicals, Coumarin
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-265581DOI: 10.1002/cctc.201901316ISI: 000497857800007Scopus ID: 2-s2.0-85074344246OAI: oai:DiVA.org:kth-265581DiVA, id: diva2:1379574
Note

QC 20191217

Available from: 2019-12-17 Created: 2019-12-17 Last updated: 2019-12-17Bibliographically approved

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Maier, Annika CarolinJonsson, Mats

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