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Title:Surface modified titanium dioxide using transition metals : nickel as a winning transition metal for solar light photocatalysis
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)
Files:This document has no files. This document may have a phisical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Language:English
Work type:Not categorized (r6)
Tipology: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
Numbering:21
COBISS_ID:6369818 Link is opened in a new window
ISSN on article:2050-7488
URN:URN:SI:UNG:REP:NYHZF5DR
DOI:10.1039/C7TA07176K Link is opened in a new window
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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
ISSN:2050-7488
COBISS.SI-ID:16502806 New window
Year of publishing:2018

Secondary language

Language:Undetermined
Keywords:materiali, fotokazaliza, nikel, EXAFS, XANES


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