Electrochemical regeneration of granular activated carbon saturated with Rhodamine B in a fluidized electrochemical reactor

摘要

This study investigated the electrochemical regeneration in fluidized reactor, used for granular activated carbon (GAC) saturated with Rhodamine B (RB). The regeneration efficiency is mainly affected by the generation of active spices including hydroxyl radicals. In this present modified study, the improvement of mass transfer using fluidized reactor lead to increase regeneration efficiency. This process was modelled and optimized using response surface methodology (RSM) based on central composite design (CCD). Such effective parameters on regeneration efficiency (RE) as current density, regeneration time and electrolyte flow rate were optimized and modelled using reduced quadratic model. The predictive ability of proposed model was verified by computing correlation coefficient (R-2 = 0.9956). At optimum condition, effective parameters of current density = 3.79 (mA cm(-2)), regeneration time = 100 (min) and electrolyte flow rate = 274.5 (mL min(-1)), maximum regeneration efficiency (83.7%) was achieved. The results of which were obtained after four time sequential adsorption-desorption cycles were acceptable. In conclusion, the modified electrochemical regeneration method is suggested to be used more widely as cost-effective technique.