removal of blue cat 41 dye from aqueous solutions with zno nanoparticles in combination with us and us-h2o2 advanced oxidation processes

background: the purpose of the present study was to assess the efficiency of ultrasound/hydrogen peroxide processes and ultrasound/hydrogen peroxide/zno nanoparticles in the removal of blue cat 41 dye 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, and contact 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 maximum removal efficiency rate was obtained at the nanoparticle concentration of 3 g/l. also, removal efficiency was reduced when the initial dye concentration was increased. conclusion: the combination of nanoparticles and us and h2o2 is very effective in removing blue cat 41 dye. as a result, photo catalytic processes can be considered to effectively remove environmental pollutants.