Removal of blue cat 41 dye from aqueous solutions with ZnO nanoparticles in combination with US and US-H2O2 advancedoxidation processes

Background: The purpose of the present study was to assess the efficiency of ultrasound/hydrogenperoxide processes and ultrasound/hydrogen peroxide/ZnO nanoparticles in the removal of blue cat 41dye from aqueous solutions.Methods: ZnO nanoparticles were prepared using the hydrothermal method. Variables including pH,concentration of ZnO nanoparticles, initial dye concentration, concentration of hydrogen peroxide, andcontact time were investigated.Results: H2O2 alone is not effective in dye removal. In conditions of H2O2 = 20 mg/L and US = 30 kHz,removal efficiency rates of 6.5%, 23.5%, 30%, 51.8%, and 55%, respectively, were obtained. The maximumremoval efficiency rate was obtained at the nanoparticle concentration of 3 g/l. Also, removal efficiencywas reduced when the initial dye concentration was increased.Conclusion: The combination of nanoparticles and US and H2O2 is very effective in removing blue cat 41dye. As a result, photo catalytic processes can be considered to effectively remove environmental pollutants

Keywords:

Advanced oxidation process , Ultrasonic waves , ZnO nanoparticles , Hydrothermal , Hydrogenperoxide , Dye