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Surface modified titanium dioxide using transition metals: nickel as a winning transition metal for solar light photocatalysis

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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 = 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.

Graphical abstract: Surface modified titanium dioxide using transition metals: nickel as a winning transition metal for solar light photocatalysis

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Publication details

The article was received on 14 Aug 2017, accepted on 09 Mar 2018 and first published on 09 Apr 2018


Article type: Paper
DOI: 10.1039/C7TA07176K
Citation: J. Mater. Chem. A, 2018, Advance Article
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    Surface modified titanium dioxide using transition metals: nickel as a winning transition metal for solar light photocatalysis

    A. Šuligoj, I. Arčon, M. Mazaj, G. Dražić, D. Arčon, P. Cool, U. L. Štangar and N. N. Tušar, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C7TA07176K

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