Characterisation, phase stability and surface chemical properties of photocatalytic active Zr and Y co-doped anatase TiO2 nanoparticles

Abstract

PostprintThis is the accepted version of a paper published in Journal of Solid State Chemistry. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination. Citation for the original published paper (version of record):Mattsson, A., Lejon, C., Bakardjieva, S., Stengl, V., Österlund, L. (2013) Characterisation, phase-stability and surface chemical properties of photocatalytic active Zr and Y co-doped anatase TiO2 nanoparticles. The band gap is slightly blue-shifted at high doping concentrations, and red shifted at lower doping concentrations. Formic acid adsorption was used as a probe molecule to investigate surface chemical properties and adsorbate structures. It was found that the relative abundance of monodentate formate compared to bidentate coordinated formate decreases with increasing doping concentration. This is attributed to an increased surface acidity with increasing dopant concentration. Photodegradation of formic acid occurred on all samples. With mode-resolved in situ FTIR spectroscopy it is shown that the rate of photodegradation of monodentate formate species are higher than for bidentate formate species. Thus our results show that the trend of decreasing photo-degradation rate with increasing dopant concentration can be explained by the adsorbate structure, which is controlled by the acidity of the surface. Journal of Solid

Synthesis, characterization and visible light photocatalytic activity of Mg2+ and Zr4+ co-doped TiO2 nanomaterial for degradation of methylene blue

“…From the time electrochemical splitting of water in presence of TiO 2 assisted by light was reported, among semiconductor photocatalysts, nano crystalline TiO 2 have attracted extensive interest as promising material in view of its applications in environmental pollution abatement and energy storage [1][2][3][4][5][6]. However, TiO 2 is sensitive to only UV light due to its large band-gap energy (anatase: 3.2 eV), restricting its practical applications under visible light and also photogenerated electron-hole pairs get reduced by recombination process, enabling lower photocatalytic activity [7]. In this context there is a necessity to reduce the band gap of TiO 2 suitably sensitive to radiant solar energy which comprising only 3-4% of UV radiation.…”

Low temperature synthesis and mechanism of finely dispersed nanorod rutile titanium dioxide

“…It might be ascribed to the phonon connement and surface stress effects in the samples 25,26. It might be ascribed to the phonon connement and surface stress effects in the samples 25,26.…”

Improvement of Orange II Photobleaching by Moderate Ga3+ Doping of Titania and Detrimental Effect of Structural Disorder on Ga Overloading

“…Depending on the nature of the element two major types of dopants, P-type and N-type, can be discerned. A P-type doping is achieved by incorporating the cation of valency lower than Ti 4+ ; these include In 3+ [4], Al 3+ , Cr 3+ , Ga 3+ , La 3+ , and Y 3+ [5], whilst dopants of N-type are cations of a valency higher than 4, for example, Nb 5+ , Ta 5+ [6], Sb 5+ , W 5+ [7], and Mo 6+ [8]. The main goal of doping is a bathochromic shift, moving an absorption edge from the UV to the visible light area, thus reducing the band gap.…”