Electrochemical oxidation of aniline using Ti/RuO-SnO and Ti/RuO-IrO as anode.

Electrocatalytic properties of anode and the electrolyte composition are important parameters influence the degradation efficiency for aniline wastewater. Ti/RuO-SnO and Ti/RuO-IrO have been fabricated using thermal decomposition method and experiments in electrolyte containing 0.05 M NaSO, 0.05 M NaCl and 0.05 M NaSO+0.005 M FeSO at different current density were conducted to study the influence on aniline degradation. Linear sweep voltammetry (LSV) showed that Ti/RuO-SnO had higher oxygen evolution potential and degrade aniline through electrochemical transformation and electrochemical combustion while Ti/RuO-IrO degrade aniline mainly through electrochemical transformation. The study showed that Ti/RuO-SnO had higher electrocatalytic activity towards the degradation of aniline than Ti/RuO-IrO anode in 0.05 M NaSO and in 0.05 M NaCl electrolyte. The maximum TOC removal efficiency for Ti/RuO-SnO was 64.2% at 40 mA cm in NaSO electrolyte while the average MCE was 1.6% and the average EC was 1.51 kWh (g TOC). On the contrary, the maximum TOC removal efficiency for Ti/RuO-IrO was 63.1% at 40 mA cm in NaCl electrolyte while the average MCE was 1.6% and the average EC was 1.95 kWh (g TOC). The presence of Fe in NaSO electrolyte would decrease the TOC removal efficiency except at low current density (20 mA cm) for Ti/RuO-SnO. These results indicated that Ti/RuO-SnO and Ti/RuO-IrO anode were suitable in NaSO and NaCl electrolyte, respectively, while the presence of Fe would inhibit aniline degradation.