The article considers the influence of precursor type and sol-gel synthesis conditions of TiO2 on its properties. The obtained TiO2 samples were characterized by X-ray diffraction methods, electron microscopy, as a result of which it was found that all the obtained TiO2 powders have the crystallite size in a nanorange of 2.5–17 nm. It was shown that sorption-photocatalytic properties of TiO2 significantly depend on a phase composition, surface acidity, specific surface area and porosity.
Adsorption methods for removing Rhodamine B from wastewater and oxidative degradation methods based on the use of advanced oxidation processes (sonolysis, photolysis, sono-, photo- and sonophotocatalysis) are considered. It has been established that naturally occurring materials (such as clays, zeolites, coal ash, anaerobic sludge, agricultural solid wastes) and their modified or activated analogues are used as adsorbents for the removal of Rhodamine B.
In this work a detailed investigation of heterogeneous photocatalytic degradation of Navy blue HE2R 1 (NB), azo dye of the reactive class is presented using UV/TiO2/H2O2 process in the aqueous suspension under 8W low-pressure mercury vapor lamp irradiation. Here we also report about optimization of various experimental parameters such as effect of catalyst concentration, effect of substrate concentration, effect of H2O2 addition.