Response surface modeling for the treatment of methylene blue from aqueous media using electro-Fenton process before determination by UV-VIS spectrometer: Kinetic and degradation mechanism

In the present study, response surface methodology was employed to investigate effects of main variables, including initial MB concentration, hydrogen peroxide dosage, current density, and electrolysis time on removal efficiency using electro-Fenton (EF) process. The concentration determination by UV-VIS spectrometer. EF process degrades contaminant molecules highly oxidizing species •OH. A quadratic regression model developed predict MB, where R2 value found be 0.9970, which indicates satisfactory accuracy proposed model. ANOVA analysis showed a non-significant lack fit (0.0840). Moreover, predicted correlation coefficient values (R2=0.9915) were reasonably in agreement with adjusted (R2=0.9958), demonstrating significant for dye removal. addition, obtained results 95.8% removed optimum efficiency, 20 mg L-1, H2O2 dosage 400 ?L, density 7.0 mA cm-2, 10 min agreed 98.3%. Electrical energy consumption 0.163 kWh m-3.