Photocatalytic processes, acting mainly on the following topics: development of solar- and visible-light-sensitive photocatalysts; development of technologies that reduce the recombination process, such as: semiconductor coupling, metal and nonmetal doping and semiconductor-carbonaceous materials coupling. Evaluation of photocatalytic efficiency of prepared materials by photodegradation reactions (photodegradation of organic dyes and persistent organic pollutants), development of photocatalytic reactors (batch and continuous).