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Title:Surface modified titanium dioxide using transition metals : nickel as a winning transition metal for solar light photocatalysis
Authors:ID Šuligoj, Andraž (Author)
ID Arčon, Iztok (Author)
ID Mazaj, Matjaž (Author)
ID Dražić, Goran (Author)
ID Arčon, Denis (Author)
ID Cool, Pegie (Author)
ID Lavrenčič Štangar, Urška (Author)
ID Novak Tušar, Nataša (Author)
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Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
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.
Keywords:surface modified TiO2, XANES, EXAFS, Nickel, solar light photocatalyst
Year of publishing:2018
Number of pages:11
PID:20.500.12556/RUNG-3951-6a2cca5a-0c8f-4025-ff89-a470a5e8a48f New window
COBISS.SI-ID:6369818 New window
ISSN on article:2050-7488
DOI:10.1039/C7TA07176K New window
Publication date in RUNG:01.06.2018
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Record is a part of a journal

Title:Journal of materials chemistry
Shortened title:J. mater. chem. A
Publisher:RSC Publications
Year of publishing:2018
COBISS.SI-ID:16502806 New window

Secondary language

Keywords:materiali, fotokazaliza, nikel, EXAFS, XANES