Investigating the effect of hydrogen peroxide as an electron acceptor in increasing the capability of slurry photocatalytic process in dye removal

Abstract The hydrogen peroxide role in photocatalytic degradation of an anionic azo dye, Acid Orange 7 (AO7), was investigated a slurry reactor. Commercial ZnO nanoparticles with average size between 10 to 30 nm were used as catalysts. Optimum conditions for different parameters, including dye concentration (10–100 mg/L), catalyst (0.1–0.5 g/L), and pH (5–10), determined first the absence H2O2. Changes COD measured optimum condition. impact adding at concentrations system operating investigated. It observed that 0.416 mM increased system's efficiency decreased reaction time by 40 min. followed first-order kinetic. Hydrogen alone did not contribute oxidizing contaminant, its positive attributed decreasing electron-hole recombination process. Not only can peroxide-assisted process decrease retention treatment units, but it also result more contaminant degradation. Therefore, reduce cost.