The influence of SiO2 addition into the TiO2 - on its structure and, consequently, on its photocatalytic activity - was investigated by means of XRPD, FE-SEM, TEM, XPS, FT-IR and BET analysis. Doping titania with silica also confirmed a SiO2 retarding effect on anatase-to-rutile phase transformation and on crystallite growth. Photocatalytic activity of the samples was assessed by means of FT-IR spectroscopy. The results showed not only that rutile is a good photocatalyst, even at 900 °C, but also that photocatalytic activity of doped powders fired at this temperature is excellent.
COBISS.SI-ID: 1677671
We developed a new experimental approach based on appropriate combination of optical and electron microscopy with elemental analysis for quick but reliable identification of pigments in deifferent coatings on walls. This method is very useful, specialy because it gives direct information not only about pigments that were actually used but also about the development of wall decorations through the history. The method was presented for different cases and different historical anorganic pigments.
COBISS.SI-ID: 1688423