Photocatalytic decolorization of azo-dye with zinc oxide powder in an external UV light irradiation slurry photoreactor

CaSnO 3 obtained by modified Pechini method applied in the photocatalytic degradation of an azo dye

“…An interpretation of the influence of pH on photocatalytic degradation must be performed considering the semiconductor surface charge, substrate nature and •OH production, which also changes at different pH values [40,41,46,47]. According to literature data, two different photocatalysis mechanisms may occur for basic and acidic solutions.…”

Decolorization and Mineralization of Batik Wastewater through Solar Photocatalytic Process

“…The presence of oxygen enhanced photocatalytic degradation since it will react with conduction band electrons in order to form superoxide radical anions which eventually yield reactive •OH (Fotiadis et al 2007). The oxygen supplied into the batik wastewater could prevent the recombination between electron and hole which would reduce the photocatalytic activity (Nishio et al 2006). As the ZnO irradiated by solar light, an electron is excited out of its energy level to conduction band and leaves a positive hole in the valence band.…”

Synthesis of hierarchical RGO@Cu2O@Cu nanocomposites: optimization of photocatalytic degradation of Direct Orange 39 using a response surface methodology

“…7, an increase in degradation efficiency is observed by increasing the catalyst concentration of 0.2-0.4 g L −1 but further increase in the catalyst dosage up to 0.8 8 g L −1 had no significant effect on photocatalytic efficiency. This This behaviour can be attributed to the availability of more number of active sites on photocatalyst surface which resulted in increase the population of hydroxyl radicals and adsorption of DO39 molecule on the catalyst surface and consequently photocatalytic performance will be enhanced [36,37]. Further increase in the catalyst dosage up to 0.8 g L −1 had no significant effect on photocatalytic efficiency probably due to tendency of nanoparticles to aggregate when their quantity is in excess as available catalyst surface for photon absorption would not further increase [38][39][40].…”