Decolorization of Reactive black-5 Dye by UV based photocatalytic with immobilized ZnO nanoparticles onto ceramic plate surface

Abstract

The textile wastewater contains components of dye and inorganic salts which are very dangerous when they are directly discharged into the water body without any prior treatment. In this study, the ability of immobilized ceramic/ZnO nanoparticles (NPs) for decolorization of Reactive black 5 dyes was investigated. A laboratory scale of rotating disc type reactor with UV-C lamp and dip coating method to immobilize nanoparticles were used in this study. Ceramic/ZnO NPs were then characterized by SEM-EDS. EDS result has shown that 82% of ZnO NPs were dispersed on the ceramic surface with maximum catalyst dosage of 5.5 mg/cm2. It was achieved after 3 cycles of impregnation process at 500°C. Photocatalytic activity of ceramic/ZnO NPs was strongly depended on pH and RB5 initial concentration. It possesses the highest photocatalytic activity (100% of decolorization efficiency) at the extreme alkaline condition and low RB5 concentration (3 mg/L) after 90 min of treatment time.