The study on the photoelectrochemical dissociation of water re- ported by Fujishima and Honda in 1972 opened the era of TiO2 photocatalysis (PC) (Fujishima and Honda, 1972). Since then, the applications of TiO2 photocatalysis for different purposes were extensively investigated (Cavalcante et al., 2015; Ioannou et al., 2011; Liu et al., 2008a; Liu et al., 2008b). Fundamentals of TiO2 photocatalytic processes have been proposed in the literature (Cavalcante et al., 2015; Kuipers, 2014).