| Title: | Photocatalytic Activity of Zirconium- and Manganese- Codoped Titania in Aqueous Media: The Role of the Metal Dopant and its Incorporation Site |
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| Authors: | ID Pliekhov, O. L., University of Nova Gorica (Author)
ID Arčon, Iztok, University of Nova Gorica, Jožef Stefan Institute (Author)
ID Novak Tušar, Nataša, National Institute of Chemistry, University of Nova Gorica (Author)
ID Lavrenčič Štangar, Urška, University of Nova Gorica (Author) |
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| Files: |
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | The development of efficient TiO2-based photocatalysts for
water treatment is mainly performed by doping with transition
metals or by establishing junctions between different phases,
metal–semiconductor or semiconductor–semiconductor. We
present, for the first time, the synthesis of Zr- and Mn-modified
TiO2 by a redesigned sol–gel technique that allows the formation
of heterometallic bridges on the TiO2 surface. Cations of
the doping metals are located in the pores of mesoporous
anatase and attached to the crystalline TiO2 walls. The presence
of the Zr enhances the photoactivity of the TiO2 catalyst.
However, the introduction of Mn decreases the photocatalytic
efficiency in a nonadditive manner. The inhibition effect was
assigned to the side reaction between hydroxyl radicals and
Mn ions. The fact that Mn effectively scavenges the hydroxyl
radicals and, consequently, inhibits the whole oxidation process
is direct proof that hydroxyl radicals are the main reactive
species in the photocatalytic oxidative processes on TiO2 surfaces
in aqueous media and the process of COH generation is the
rate-determining step, which was confirmed using a method
based on the decolorization of a commercial dye Bezaktiv Blau
in a reaction with Fenton’s reagent as a source of hydroxyl radicals. |
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| Keywords: | doping, manganese, oxidation, X-ray absorption spectroscopy, zirconium |
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| Publication version: | Version of Record |
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| Year of publishing: | 2016 |
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| Number of pages: | 2109-2118 |
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| Numbering: | 8 |
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| PID: | 20.500.12556/RUNG-2516 |
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| COBISS.SI-ID: | 5943322 |
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| DOI: | 10.1002/cctc.201600206 |
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| NUK URN: | URN:SI:UNG:REP:LWZMUN63 |
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| Publication date in RUNG: | 21.07.2016 |
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| Views: | 4968 |
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| Downloads: | 0 |
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