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| Studies on the degradation of methylene blue wastewater with sono-electrochemical oxidation |
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Abstract A novel lead dioxide electrodes co-doped with rare earth (La2O3) and polytetrafluoroethylene (PTFE) were prepared by the electrochemical deposition and applied as anodes for the degradation of typical dye wastewater (methylene blue) in the sono-electrochemical system. The sono-electrochemical syngestic factors are respectively 1.29 and 1.36 by using PbO2/Ti and La-PbO2/Ti as anode. Further different effects containing vary electrodes, ultrasonic frequency, power, pollutant concentration, electrolyte concentration, current intensity were investigated, the result showed that the removal of 200mg/L methylene blue reached to 89.51% under the condition of 49.58W/cm2 power, 50Hz frequency, La-PbO2/Ti used as the anode, 71.43mA/cm2 current density, 14.2g/L sodium sulfate after reaching 2h. The intermediates were monitored by the methods of GC-MS, IC, and then the degradation pathways were proposed.
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Received: 01 September 2011
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