The Application And Researcn Of Photoelectrocatalysis Technology In The Treatment Of Waste Water With New Type Of Semiconductor

With the rapid development of industry,photocatalytic and electrochemical oxidation of organic wastewater has become a hot research field in the field of water treatment.The traditional methods often need to face energy consumption,incomplete degradation and even secondary pollution in dealing with organic wastewater.problem.Photoelectric catalysis as a new type of catalytic technology,is in the catalytic process to impose an external circuit,so that the photo-generated electron-hole separation,to extend the carrier life,breaking the existing photocatalytic quantum efficiency of less than 10%of the status quo,Significantly improved the photocatalytic efficiency.The high performance membrane electrode is the key to the practical application of photoelectric catalytic technology.Based on this,this paper focuses on the preparation of photoelectrode electrode with good catalytic effect.The main contents are as follows:?1?Preparation of three-dimensional porous titanium dioxide film?3D-TiO2-TFE?and exploration of the best conditions:After repeated cleaning with acetone and deionized water three times to remove surface debris and grease,Hot temperature,hydrothermal time,tempering temperature conditions.It can be seen from the SEM that the electrode has a three-dimensional structure of the titanium dioxide thin film electrode,porous three-dimensional structure of the light in the hole in a number of refraction,scattering,increased sample light utilization,photocurrent detection also reached the same result.The samples were used to degrade 30 mg/L reactive brilliant blue dye with a degradation rate of 88%..?2?Preparation of black titania?B-TiO2?doped PbO2 electrode and its photoelectrocatalytic performance:B-TiO2 was prepared by adding NaBH4 at high temperature with P25 as raw material.NaF was added with lead nitrate as lead source and mixed with different proportions of black titania to set the plating solution.The titanium flakes prepared by the pretreatment were immersed in the electrolytic solution and electroplated under different B-TiO2 dosage.Through different B-TiO2 doping The optimum electrode was prepared.From the linear voltammetry,it can be seen that the use of B-TiO2 itself has the characteristics of high oxygen evolution potential,which improves the oxygen evolution potential of the sample,thus restrains the occurrence of side reaction and improves the electrochemical performance of the sample.The samples were used to degrade 30 mg/L reactive brilliant blue dye with a degradation rate of 80%.?3?Preparation of conductive carbon black modified PbO2 electrode and photoelectrocatalytic performance:The electrochemical carbon black was acidified by HNO3,and the titanium plate was prepared by the method described above.Under different conditions,the electrode of the conductive carbon black,lead nitrate and NaF as the plating solution were prepared by different methods,and the optimum preparation conditions were obtained by electrodeposition.It can be seen from the characterization results that the introduction of conductive carbon black reduces the grain size of the sample surface and increases the surface area of the sample.The electrochemical test results show that the electrochemical active area of the sample is obvious compared with that of pure PbO2 electrode The surface active sites of the electrodes are increased and the electrochemical properties of the electrodes are improved.The samples were used to degrade 30 mg/L reactive brilliant blue dye with a degradation rate of 92%.After repeated cycles of the electrode,the sample still have significant activity,electrode stability is good.?4?Preparation of Ti₄O₇ doped PbO2 electrode and its photocatalytic performance:The etched titanium sheet was prepared by the method described above.The modified PbO2electrode was prepared by electrodeposition with a certain proportion of lead nitrate,NaF and Ti₄O₇.It can be seen from the characterization results that the introduction of Ti₄O₇ makes the grain surface of the electrode appear obvious refinement,the specific surface area is greatly improved,thus increasing the active site of the sample surface and improving the degradation rate of the sample.The samples were used to degrade 30 mg/L reactive brilliant blue dye with a degradation rate of 80%.