The first prepared nanocomposites with zeolites H-Beta, H-ZSM-5 and anatase and η-phases, doped by V, Ni, Ag, are multifunctional materials for water purification from harmful pollutants and pathogenic bacteria.
The new phase, where peroxo groups are incorporated into titania particles, along with anatase and hydrated η-TiO 2 with peroxo groups on the surface of titania nanoparticles, were prepared by introduction of H 2 O 2 into reaction mixtures while synthesizing TiO 2 from TiOSO 4 or by cold impregnation of pre-synthesized TiO 2 . 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 [TiO x (O 2 ) 2-x (H 2 O) m ] phase was first structurally characterized and compared to η-TiO 2 . Most samples of H 2 O 2 -sensitized TiO 2 discolor methyl orange under visible light irradiation faster than commercial Hombikat UV100 treated with H 2 O 2 . 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.
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