Morphology, size and growth of hydrothermally prepared anatase crystals were studied. From HRTEM images shape of crystals was reconstructed. Small, irregular blocky anatase nuclei become rod-like at higher temperature, stretching along one of the 〈101〉 directions. Crystals further develop into wedge-shaped ones with almost absent base pinacoids. In the final stage, crystals evolve into equilibrium shape: plain tetragonal bipyramids.
COBISS.SI-ID: 25695015
The photocatalytic activity of ZnO varied with its morphology; ZnHC was not photocatalytic. Rod-like crystals showed a better photocatalytic effect than flower- and hedgehog-like crystals. More profound photocatalytic effect was achieved with smaller crystals. The band gap of hydrozincite was 4.1 eV, determined for the first time.
COBISS.SI-ID: 5188890
The photocatalytic degradation of the psychoactive substance caffeine was studied using composites prepared with multi-walled carbon nanotubes and three different TiO2 materials. Caffeine can be removed from aqueous solutions using composite photocatalysts. CNT have a positive effect on the photo-activity of larger TiO2 anatase particles. Photogenerated holes are preferential pathways for the photodegradation process
COBISS.SI-ID: 26271015