Abstract
Titanium dioxide (TiO2) microspheres were prepared via a sol-gel route and the textural properties of these substrates developed through thermal treatment performed between 100 °C and 500 °C which led to the decomposition of organic groups and sintering between microparticles. The annealed TiO2 microglobules enclosed a nanopore network consisting of alternating bulges and throats. The nitrogen adsorption isotherms of the TiO2 xerogels treated at 100 °C and 500 °C possessed very narrow hysteresis loops, whereas the corresponding adsorption isotherms of the TiO2 microglobular samples annealed at 200-400 °C showed well-defined hysteresis cycles.The UV catalytic photoreduction of Methyl Orange solutions in the presence of porous TiO2 microspheres occurred to a significant extent regardless of the annealing temperature employed; anatase was present between 200 °C and 500 °C while the appearance of rutile started from 350 °C onwards. Electron release took place from the external area of the microglobules rather...
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