Parameters optimization, kinetics, isotherm modeling of cationic and disperse dyes removal procedure using bi-polar iron electrocoagulation system
Abeer A. Moneer, Nabila M. El‐Mallah, Manal M. El-Sadaawy, Mohamed Khedawy, M. Sh. Ramadan
Abstract
ABSTRACT The present work compares the efficiency of iron electrocoagulation in the removal of two different dyes; Reactive Red 35 (RR35) and Disperse Yellow 56 (DY56). Numerous operating parameters such as pH, type of supporting electrolyte were studied. The operating cost of the process was computed and it was found to be a cost-effective process in the treatment of textile wastewater. The removal of RR35 dye was under optimum conditions of 50 mg L –1 initial concentration, pH of 6, 0.5 g NaCl as supporting electrolyte, 43.4 A m –2 current density was an ideal and economic choice that gave best percent removal with maximum power saving. On the other hand, for the removal of DY56, the optimum conditions which result in the best percent removal were the same as for RR35 except for the initial dye concentration was 40 mg L –1 . The best removal efficiency was 96.89% and 94.67% for RR35 and DY56 respectively. Adsorption data were analyzed, different error analysis conforms that the isotherm data followed Langmuir for both studied dyes. The fact that adsorption of the dyes molecules onto the insoluble iron hydroxide flocs was established using energy-dispersive X-ray analysis and Fourier-transform infrared spectroscopy analyses. The results indicated that the first-order rate equation is the fit for the process. The thermodynamic results indicated that the process is spontaneous, randomness, and endothermic adsorption. Finally, multiple regression analyses were conducted.