Study On The Electrode Photoelectric Activity Of Particles With Loading TiO₂

TiO2/particle electrode of three-dimensional system can achieve TiO2immobilizing,give full play to the photocatalytic activity of TiO2and be well degradating the organicpollutants. This article selected ceramics and quartz sand as electrode, prepariedTiO2/ceramics and TiO2/quartz sand by sol-gel method and studied its photoelectriccatalytic activity.In the experiment, TiO2/ceramics, TiO2/quartz sand and iron, graphite consisted ofcomposit particle electrode with a certain percentage respectively, graphite was used asmain electrode, a certain consistence of methylene blue solution was used as the target,HDV-7C potentiostat transistor provided a constant voltage of the reaction, usedanhydrous Na2SO4solution as supporting electrolyte, used UV lamp(20W, λ=253.7nm)as light source, that constituted dimensional photoelectric catalytic system.Experiment discussed the factors affecting the performance of dimensional electrodephotoelectrocatalytic systematicly. Experiment showed that:(1)The best conditions ofTiO2/ceramics system is the calcination for500oC, the concentration of methylene bluesolution for5mg/L, concentration anhydrous Na2SO4for0.02mol/L, the layers of TiO2/ceramics for three, iron: loading three TiO2/ceramics=5:1, the voltage for2V, platedistance for3cm, illumination distance for16cm, pH=10, aeration,the degradationefficiency of methylene blue can reach96.2%.(2) The best conditions of TiO2/quartzsand system is the calcination for500oC, the concentration of methylene blue solutionfor5mg/L, concentration anhydrous Na2SO4for0.02mol/L, the layers of TiO2/quartzsand for three,graphit:loading three TiO2/quartz sand=1:1, the power supply for2V,plate spacing for3cm,illumination distance for16cm, pH=8, aeration, the removal rateof methylene blue can reach84.9%.Experiment studied on systems with TiO2/ceramics and TiO2/quartz doped with Nelement, metals(Fe, Co, Ni, Cu, Zn)and Co-doping. Experimention shows that thedoping percentage of element and the species of element play an impaotant role in photoelectrocatalytic performance,(1)TiO2/ceramics system, N doping could wellimprove the efficency of photovoltaic catalytic, Ni doping displays best consequent, andin the co-doped, N-Ni doping displays best consequent, the degradation rate can reach71.5%.(2) TiO2/quartz sand system,at the same, N doping could well improve theefficency of photovoltaic catalytic, Fe doping displays best consequent, and in theco-doped, N-Fe doping displays best consequent, the degradation rate can reach68.6%.