| Title: | Surface modified titanium dioxide using transition metals : nickel as a winning transition metal for solar light photocatalysis |
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| Authors: | Šuligoj, Andraž (Author)
Arčon, Iztok (Author)
Mazaj, Matjaž (Author)
Dražić, Goran (Author)
Arčon, Denis (Author)
Cool, Pegie (Author)
Lavrenčič Štangar, Urška (Author)
Novak Tušar, Nataša (Author) |
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| Files: | This document has no files. This document may have a phisical copy in the library of the organization, check the status via COBISS.  |
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| Language: | English |
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| Work type: | Not categorized (r6) |
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| Tipology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica |
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| Abstract: | Titanium dioxide has been widely used as an antimicrobial agent, UV-filter and catalyst for pollution abatement. Herein, surface modifications with selected transition metals (Me) over colloidal TiO2 nanoparticles and immobilization with a colloidal SiO2 binder as composite films (MeTiO2/SiO2) on a glass carrier were used to enhance solar-light photoactivity. Colloidal TiO2 nanoparticles were modified by loading selected transition metals (Me ¼ Mn, Fe, Co, Ni, Cu, and Zn) in the form of chlorides on their surface. They were present primarily as oxo-nanoclusters and a portion as metal oxides. The structural characteristics of bare TiO2 were preserved up to an optimal metal loading of 0.5 wt%. We have shown in situ that metal-oxo-nanoclusters with a redox potential close to that of O2/O2 were able to function as co-catalysts on the TiO2 surface which was excited by solar-light irradiation. The materials were tested for photocatalytic activity by two opposite methods; one detecting O2 (reduction, Rz ink test) while the other detecting OH (oxidation, terephthalic acid test). It was shown that the enhancement of the solar-light activity of TiO2 by the deposition of transition metal oxo-nanoclusters on the surface depends strongly on the combination of the reduction potential of such species and appropriate band positions of their oxides. The latter prevented excessive self-recombination of the photogenerated charge carriers by the nanoclusters in Ni and Zn modification, which was probably the case in other metal modifications.
Overall, only Ni modification had a positive effect on solar photoactivity in both oxidation and reduction reactions. |
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| Keywords: | surface modified TiO2, XANES, EXAFS, Nickel, solar light photocatalyst |
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| Year of publishing: | 2018 |
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| Number of pages: | 11 |
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| Numbering: | 21 |
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| COBISS_ID: | 6369818 |
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| ISSN on article: | 2050-7488 |
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| URN: | URN:SI:UNG:REP:NYHZF5DR |
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| DOI: | 10.1039/C7TA07176K |
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| Views: | 1407 |
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| Downloads: | 0 |
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| Categories: | Document is not linked to any category. |
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