The Fe/TiN/PbO₂-CeO₂ Electrode And Its Application In Phenol Degradation

As a traditional electrode material, PbO₂ is characterized by anticorrosion, high oxygen evolution potential, high electric conductivity, etc., and is widely used in various industry fields. To solve the problems of high cost and the inactivation of the base Ti of Tibased PbO₂ electrodes, this paper developed an Fe/TiN/PbO₂-CeO₂ electrode with steel Q235 as the base, and plasma-sprayed TiN as interlayer, electro-deposited α-PbO₂ and β-PbO₂-CeO₂ as transition and catalyst layer. The structure, surface microstructure and electrochemical performance of Fe/TiN/PbO₂-CeO₂ electrode were studied and the phenol removal rate and influence factors of performance degradation were investigated.The impact of electro-deposition time, electro-deposition temperature, current density and the addition of CeO₂ on electrochemical performance were studied. The best preparation parameters were obtained:190g/L Pb（NO）3, 15g/L Cu（NO）3, 0.5g/L NaF, CeO₂ 10g/L, pH 2-3 with HNO3, deposition temperature 70℃, deposition current density 15mA/cm2 and deposition time 2 hours.The electrochemical performance, accelerated life and effects of phenol degradation of Fe/TiN/PbO₂-CeO₂ electrode were also studied in this paper. It was shown that the oxygen evolution potential was 2.1V of Fe/TiN/PbO₂-CeO₂ electrode, the accelerated life was 219 hours in the 1.0mol/L H2SO4 solution, and the phenol degradation was 91.7%. Compared with Fe/TiN/PbO₂ electrode and Ti/PbO₂ electrode at the same test conditions, Fe/TiN/PbO₂-CeO₂ electrode had the best accelerated life and the lower cell potential, so it’s performance was more stable.In the process of phenol degradation, the effects of process parameters- pH value, temperature, current density, concentration of electrolyte Na2SO4 and electrolysis time on phenol removal were analyzed, and the optimal parameters were 100mg/L phenol, 0.1mol/L Na2SO4, about pH 3, 30℃, current density 30mA/cm2 and 2.5 hours.