What is it about?
The new phase, where peroxo groups are incorporated into titania particles, along with anatase and hydrated η-TiO2 with peroxo groups on the surface of titania nanoparticles, were prepared by introduction of H2O2 into reaction mixtures while synthesizing TiO2 from TiOSO4 or by cold impregnation of pre-synthesized TiO2. The purpose of the work was to prepare titania containing peroxo groups both on the surface and in the bulk of titania nanoparticles and to find correlations between conditions of preparing samples of nano-titania modified with H2O2, their characteristics and properties.
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Why is it important?
Titanium dioxide is a wide band-gap semiconductor that can be excited to produce electron–hole pairs when irradiated with light. Such photo-induced electron–hole pairs have been used to generate electricity in solar cells, to split water into hydrogen and oxygen, to oxidize and degrade inorganic/organic/biological compounds in environments as well as to create superhydrophilicity.
Perspectives
Sensitizing titania with hydrogen peroxide by the reported methods results in higher ability to discolor methyl orange under visible light as compared to H2O2 -treated Hombikat UV100. We conclude that high activity of our samples is associated with existence of large amount of titanium peroxo complexes both on the surface and in the bulk of the titania particles along with formation of the mixed-phase samples. The samples containing peroxo groups in the bulk of the titania nanoparticles show significantly higher stability as compared to the samples containing surface peroxo groups.
Evgeny Kabachkov
Institute of the Problems of Chemical Physics Russian Academy of Sciences
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This page is a summary of: Introduction of peroxo groups into titania: preparation, characterization and properties of the new peroxo-containing phase, CrystEngComm, January 2015, Royal Society of Chemistry,
DOI: 10.1039/c5ce01090j.
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Introduction of peroxo groups into titania: Preparing, characterization and properties of the new peroxo-containing phase
The new phase, where peroxo groups are incorporated into titania particles, along with anatase and hydrated η-TiO2 with peroxo groups on the surface of titania nanoparticles, were prepared by introduction of H2O2 into reaction mixtures while synthesizing TiO2 from TiOSO4 or by cold impregnation of pre-synthesized TiO2. The samples were studied by a complex of methods (classical and synchrotron-radiation X-ray powder diffraction, small-angle X-ray scattering, high-resolution scanning electron microscopy with energy-dispersive X-ray spectroscopy, X-ray absorption spectroscopy, IR and Raman spectroscopy, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance and absorption spectroscopy, DSC). The [TiOx(O2)2–x(H2O)m] phase was first structurally characterized and compared to η-TiO2. Most samples of H2O2-sensitized TiO2 discolor methyl orange under visible light irradiation faster than commercial Hombikat UV100 treated with H2O2. The activity of the samples strongly relating to their phase composition was associated with existence of large amount of titanium peroxo complexes along with formation of mixed-phase samples.
peroxo groups titania
Design and understanding of solid-state and crystalline materials Titanium dioxide
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