RESUMO
Electrochemical oxidation of bisphenol-A (BPA) from aqueous solution using graphite electrodes has been investigated. The effect of the types and concentration of supporting electrolytes, initial pH and applied current density on the performance of the process were examined. During electrolysis, concentration of BPA has been monitored and determined using UV-vis spectra, chemical oxygen demand (COD) and energy consumption. NaCl has been considered as the best supporting electrolyte among the electrolytes used in the present study. Initial pH 5.0, higher concentration (0.01 to 0.1 M) of supporting electrolyte and higher applied current density (4 to 20 mA cm(-2)) facilitate the treatment process. The maximum COD removal of 78.3% has been achieved under the optimal experimental conditions such as NaCl concentration of 0.05 M, applied current density of 12 mA cm(-2), initial pH 5.0 and electrolysis time of 120 min. When the energy consumption has been found to be decreasing with increasing NaCl concentration, it has increased with increasing applied current density. SEM-EDAX analysis has confirmed that the gases such as oxygen and chlorine are produced during the anodic oxidation in graphite anode. The result of UV-vis spectrum analysis confirms the degradation of BPA from aqueous solution at the end of the treatment.
