Electrochemical oxidation of ciprofloxacin in two different processes: the electron transfer process on the anode surface and the indirect oxidation process in bulk solutions

摘要: Herein, the rotating disk electrode technique was used for first time to investigate effects of mass-transfer limitations and pH on electrochemical oxidation CPX, determine kinetics CPX explore intrinsic mechanisms during electron transfer process. Firstly, cyclic voltammetry revealed that an obvious irreversible peak observed within potential window from 0.70 1.30 V at all pHs. Based Levich equation, in process found be controlled by both diffusion kinetic processes when = 2, 5, 7 9; coefficient 2 calculated 1.5 × 10-7 cm2 s-1. Kinetic analysis indicated reaction surface adsorption-controlled compared a process; concentration electroactive species estimated 1.15 10-9 mol cm-2, standard rate constant 1.37 s-1, validated two-electron Finally, possible pathway proposed. The degradation Ti-based anode also conducted subsequently indirect bulk solutions. current density were determined related literature results. different pHs is believed result counterbalance between favorable unfavorable factors, namely electromigration side reactions oxygen evolution, respectively. diffusion- reaction-controlled low currents followed high currents. results presented this study provide better understanding would enable development new treatment methods based electrochemistry.