It has been studied the kinetics of photocatalytic decomposition of organic pollutants in water using TiO2-based photocatalysts. The photodegradation of Methyl Orange (MO) under UV light was chosen as the model reaction for the study of the catalysts performance. Anatase and rutile TiO2 were synthesized using hydrothermal method. The rate constant of photodegradation was used to express the catalytic reactivity of the catalyst. The synthesized catalysts were characterized by scanning electron microscopy (SEM), Raman spectroscopy and X-ray diffraction analysis (XRD).

The kinetics of caffeine photodegradation is investigated in the presence of nanostructured ZnO-based catalysts.