Removal of reactive blue 171 dye from aqueous solution and textile industrial wastewater using peroxi-electrocoagulation process by iron electrode: application of response surface methodology

Dyes are organic compounds with very complex structures that are used in various industries. The remaining dyes have a significant environmental impact on the environment and can change the physical and chemical properties of the aquatic solution. Therefore, removing them from the environment is essential. In this study, the removal of reactive blue 171 dye from aqueous solution and textile industrial wastewater using peroxi-electrocoagulation process by response surface methodology. According to the results, 99.4% of reactive blue 171 dye under optimal conditions in the peroxi-electrocoagulation (PEC) process, including the concentration of 43.1 mg.L-1, pH with 3, 9.2 mA.cm(-2) current density, 2.5 cm distance between the electrodes, 4 mM H2O2, and 7.7 min the reaction time. Under these conditions, energy consumption was equivalent to 0.275 kWh.m(-3). The removal process follows from the first-order kinetics with R-2 = 0.9771. This study showed that the PEC process can remove high levels of dye with the least amount of energy consumed from aqueous solutions and it can be used as an economical process.