Fabrication Of TiO₂-PbO₂/RuO₂-Ti Electrode And The Photoelectrocatalytic Degradation Of Berberine

The photoelectrocatalytic Technology is an advanced oxidation technology which combined photocatalytic method with electrochemical oxidation method,this technology has very good effects on the high concentration of organic compounds which ishigh stability in water、is difficult to be biodegraded,and also can improve the biodegradability of wastewater,so it is very popular with scholars.This paper uses the method of constant flow electrodeposition to prepare for TiO2-PbO2/RuO2-Ti.PbO2/RuO2-Ti.Ru0O-Ti three kinds of anode,the optimum conditions of Electrode preparation uses constant current 5mA/cm2,liquid volume 250mL deposition,120min of deposition time,and makes a analysis on electrode about SEM、XRD.The results show that,the electrode prepared for this technology has good morphology and structure,the surface of electrode is mainly beta crystal form β-PbO2,and the dopping of TiO2 does not change the crystal structure of PbO2,the PbO2 crystals is more compact,with a strong bite force after dropping,the chemical properties of electrode is stable.And chemical oxidation experiments of berberine on the electrode,the experimental results show that,with Ti02-Pb02/RuO2-Ti as anode of the highest removal rate of berberine 60.77%.The removal rate of other two kinds of anode in the range of 40%-50%.And take TiO2-PbO2/RuO2-Ti as the degradation experiment anode photoelectric catalysis and photocatalysis of berberine,berberine experimental 60min photoelectric catalytic removal rate of 73.73%,the photocatalytic removal rate of only 0.96%,prominent exhibit optical,electrochemical synergistic effect.Experimental study on the influence factors of photocatalytic degradation of berberine,berberine degradation of the optimum conditions obtained,namely take TiO2-Pb02/RuO2-Ti as photoelectric catalytic anode,anode bias voltage of 2.5V,the initial concentration of 50 mg/L berberine,pH value is 6-8,the berberine of photoelectrocatalysis 60 min of removal rate is 80.09%,the removal rate of TOC is 38%.UV-vis spectroscopy analysis of degradation of different time of berberine,berberine as the reaction progresses,during the photoelectrocatalytic process is constantly degraded into small molecular organic compounds or mineralized into CO2 and H2O.Analysis of the morphological changes of the intermediate product of Coptis degradation using three dimensional fluorescence spectrum and GC-MS,results show that,during the photoelectrocatalytic process of the berberine,pyridine ring and the big molecules of organic matter are preferred failure,generation of alkanes and other small molecular organic matter was even mineralizated,with the reaction of benzene compounds increases ceaselessly,and constantly open loop hydrogenation,high molecular weight,hard to degrade organic compounds has been significantly reduced,the biodegradability of wastewater is improved obviously.Also on the simulation of berberine pharmaceutical wastewater degradation kinetics preliminarily analyzed in different ways,the degradation of berberine were accorded with the pseudo first order kinetics equation,reaction kinetic constants were:0.0214,0.0146 photoelectric catalyticElectrochemical oxidation,photocatalytic 0.00014,the results with different degradation pathway of berberine removal results agree.