Degradation of methyl orange waste water by electrochemical oxidation method

Degradation of methyl orange (MO) waste water was conducted by electrochemical oxidation method with PbO2/Ti electrode as anode. PbO2/Ti electrode was fabricated by electrochemical deposition of PbO2 on Ti foil. The micrograph and crystal structure of PbO2 show that uniform coating of PbO2 on titanium foil was obtained and the dominant crystal structure was beta-PbO2. Degradation experiments of MO solution indicate that the degradation rate increased with cell voltage and solution conductivity. In addition, air aeration also improved the degradation of MO solution; but an increase in cell voltage or input energy decreased the energy efficiency of MO removal. The energy efficiency reached over 0.1mg kJ(-1) under a cell voltage lower than 15V, and the removal rate could reach 90%.