Abstract

• ZnO nanoparticles were synthesized by using the co-precipitation method with the precursors Zn (CH3COO)2, 2H2O, and NaOH. Three different lighting environments-darkness, daylight, and sunlight—were used in this study to examine how ZnO nanoparticles affected the photocatalytic degradation of rose bengal dye solutions. The effects of contact time, dye concentration, and catalytic dosage were studied to better understand the photocatalytic process. The photocatalytic activities of ZnO nanoparticles were investigated at three pH values: 4, 7, and 10. The optimum degradation was found to be 96.483% after 2 h of contact time at a pH of 7 under sunlight. The optimum concentration of the dye solution was determined to be 10 ppm, and the photodegradation percent under sunlight at a pH of 7 was found to be 96.003%. The optimal ZnO nanoparticle dosage was 0.30 g, and the percentage of colour deterioration was calculated to be 98.113% at a pH of 7. The photocatalytic activity of ZnO was highest at a pH of 7, compared to pHs of 4 and 10