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Oxidative power of aqueous non-irradiated TiO2-H2O2 suspensions: Methylene blue degradation and the role of reactive oxygen species
Univ Oslo, Inst Clin Dent, Dept Biomat, N-0316 Oslo, Norway..
Univ Oslo, Dept Phys, N-0316 Oslo, Norway..
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
Univ Oslo, Inst Clin Dent, Dept Biomat, N-0316 Oslo, Norway..
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2016 (English)In: Applied Catalysis B: Environmental, ISSN 0926-3373, E-ISSN 1873-3883, Vol. 198, 9-15 p.Article in journal (Refereed) Published
Abstract [en]

In the present study, the degradation of methylene blue in non-irradiated TiO2-H2O2 suspensions was investigated. Five commercially available catalysts were characterized (BET surface area, zeta potential, hydrodynamic diameter) and their oxidative power was assessed by means of the degradation of methylene blue. A subsequent EPR study was made to verify and identify potential oxidative radicals. The results showed that all suspensions could degrade methylene blue significantly stronger compared to hydrogen peroxide alone. A broad variation between the different catalysts in their capability to adsorb dye molecules was found which was essential for decomposition of methylene blue in darkness. The highest degradation rate of all samples was found for Degussa P25 at neutral pH. EPR studies of this sample verified the presence of oxygen centred radicals namely hydroxyl ((OH)-O-center dot) and superoxide radicals (O-2(-center dot)/(OOH)-O-center dot). Non-irradiated TiO2-H2O2 systems show great potential not only in dye removal applications but also in the field of disinfection where low concentrations of hydrogen peroxide are required and irradiation may not be feasible.

Place, publisher, year, edition, pages
2016. Vol. 198, 9-15 p.
Keyword [en]
TiO2, H2O2, Methylene blue, Reactive oxygen species, EPR
National Category
Nano Technology Chemical Sciences
URN: urn:nbn:se:uu:diva-304130DOI: 10.1016/j.apcatb.2016.05.036ISI: 000381950000002OAI: oai:DiVA.org:uu-304130DiVA: diva2:1024005
Available from: 2016-10-04 Created: 2016-10-03 Last updated: 2016-10-04Bibliographically approved

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