Preparation Of Surface Re-Doped PbO₂/Sn-Sb/Ti Anode And Electro Catalytic Oxidation Of Phenol

The preparation and its properties of the rare earth electrode blended with PbO₂/Sn-Sb/Tiare mainly researched in the paper. At the same time, taking phenol sewage as target organicmatter, the degrading technology is optimized.The principal influencing factors on the properties of the electrode are shown asfollowing: electro deposition temperature&time and the blended content of the rear earth.They are much more detailed studied. Through the home electrode, the effects of the abovemixed electrode are evaluated, the corresponding preparing technology is determined: for Ndelectrode blended with PbO₂/Sn-Sb/Ti, only under the following conditions:50℃electrodeposition temperature;2h electro deposition time;1:0.25blended amount, the properties ofthis kind of electrode are proven best; contrasting with the above, for La electrode blendedwith PbO₂/Sn-Sb/Ti the optimal electro deposition temperature is5000C; the electrodeposition time is3h; the blended amount is1:0.25.With the help of the testing and analyzing methods of XRD, SEM, EDX and so on, thestructure of coated crystal, configurations of the electrode surface and the elementcompositions of electrode surface coating of different rare earth electrodes blended withPbO₂/Sn-Sb/Ti are characterized and analyzed. The study results show that the mixedelectrode is beneficial to the even distribution of the crystals, the crystal particles areobviously becoming uniform and moreover their development becomes much better withdifferent forms of state, so the closer connection increases the specific surface area of theelectrode, thus is good for catalytic reaction. It is obvious that the blended rare earth undercontrol can enhance the mechanic wedging force between the middle layer and surfacecatalyzed activating layer and furthermore reduce the cast-off of the activating layer. At themeantime, the earth is more favorable to the coating of the middle layer, and so is the increaseof the conductivity. The properly blended rare earth can promote the enhancement of theproperties of PbO₂/Sn-Sb/Ti electric catalysis.Taking self-made PbO₂/Sn-Sb/Ti electrode as anode and titanium plate as cathode, theanode oxidized and degraded studies for the phenol sewage are conducted in theno-diaphragm/membrane cell. For the anode matter--phenol, the influences of the initialconcentration, degradation temperature and voltage, initial PH volume and concentration ofthe solution on the processed effects are systematically explored. The results show that thedegradation effect of the blended electrode are much better than that of the others; with the rise of the temperature, the decreased rate of the phenol is also increased, when thetemperature reaches70℃, the rate is up to97%, so the temperature rise can accelerate thecatalyzed and oxidized degradation rate of the phenol by electricity; all the rates above turnhigh with the rise of voltage, the optimal number is16V under the conditions of theexperiment; the initial concentration of the solution becomes dense, the decreased rate will bereduced, but the total amount of the rate is just on the contrary; the decreased rate under theacid condition is better than that on medium condition.