Anodic Degradation of Ofloxacin on a Boron-Doped Diamond Electrode

摘要

This study investigates the electrochemical oxidation of ofloxacin mainly on a boron-doped diamond(BDD) anode under galvanostatic electrolysis. The influence of operating parameters such as currentdensity, initial concentration of ofloxacin, and temperature was investigated. For comparison, a Ptplanar electrode and a dimensional stable anode (DSA) were also tested. According to cyclicvoltammetric analysis, the oxidation of ofloxacin on BDD was found to be electrochemicallyirreversible. The electro-degradation of ofloxacin was a pseudo-first-order reaction, and the apparent-3 -1 2 rate constant was 1.210 s for the anodic ofloxacin oxidation on BDD at 100 mA/cm and 30C in0.1M Na2SO4 electrolyte. The degradation efficiency of ofloxacin increased with increasing currentdensity and temperature, but noticeably decreased as initial ofloxacin concentration increased.Furthermore, the BDD anode was superior to the Pt and DSA electrodes for ofloxacin degradation interms of degradation efficiency and oxidation rate. The activation energy for the ofloxacin degradationon BDD was 4.79 kJ/mol.