Removal of N-2RBL Nylosan Red Dye from Aqueous Solution by Fenton Using Response Surface Methodology

In this study, the optimization of N-2RBL Nylosan red (NR) dye degradation by Fenton process (Fe2+/H2O2) using response surface methodology (RSM) was evaluated. A 2(3) full factorial design was employed to design runs and analyse the effects of three independent factors: stirring speed (150-800 rpm), dye concentration (50-500 mu M) and treatment time (30-1,440 min), as well as the interaction factors on the reaction rate (%). According to the results, treatment time had the most significant impact on the removal efficiency of NR. The interactions factors of dye concentration and stirring speed, and stirring speed and treatment time have the strongest effects, expressed by the high values of interactions coefficient. The analysis of variance showed a coefficient of determination (R-2) of 100%. The maximum dye removal efficiency of 96.74% was achieved at optimum conditions with Nylosan red concentration of 50 mu M, stirring speed of 800 rpm and treatment time of 1,440 min.