Abstract: By using electro-deposition Ti-PbO2-La electrodes, visited different La-doped electrodes for electrochemical oxidation of the formation of ?OH. Combined with SEM and XRD, found that La-doped in electroplating solution enables active electrode layer occurs enlarges electrode structure changes, while increasing the stability of hydroxyl radicals generated in more degradation. Experiments show when the doping of 0.015mol/L of electrodes to simulated water treatment efficiency. Meanwhile, the change of nitrobenzene, CODcr concentration and current intensity, pH, initial concentration is associated. The best treatment actual water conditions: I = 0.9A, pH = 5, d = 1cm.When started with the NB (ρ) is 322.7mg \ L and CODcr is 1730mg / L, after the reaction of 3h, the NB (ρ) is less than 0.2mg / L, CODcr is less than 40mg / L, which meet the national emission standards.

Key words: Electrode, Hydroxyl radical, Nitrobenzene, Chemical oxygen demand(COD)