Preparation And Application Of Nano-TiO₂ Doping Cerium

In a flock of semiconductors, TiO₂ has many merits of stable chemical reaction,high photocatalytic efficiency,low cost,nonpoisonoue material and so on.But TiO₂ only takes advantage of uitraviolet ray.The ultilization of visible light is very low.So technology of changing TiO₂`s quality has been the hot pot in recent years.In this thesis, mineral kaolinite was used as substrate to prepare nano TiO₂/Ce compound photocatalyst by sol-gel method. Wastewater of azo dye was decooured by the photocatalyst TiO₂ and the optimal technique condition was obtained.The results of experiments showed :The compound photocatalyst of TiO₂/Ce sestrained the change of the crystal of TiO₂ in high calcinations temperature .It also reduced the cohesion of TiO₂.The concentration of the Ce dopant and calcinations temperature showed remarkable effect to photodegration .Through the analyzing of the individual elements,it got the best experiment conditions : The concentration of the Ce dopant was 3%; The calcinations temperature was 550℃;The calcition time was 2 hours ;The reaction time was 2.5 hours.In these conditions ,the phtodegration was enhanced quickly.In additional ,because the photocatalyst of TiO₂ can kill the common pathogenic bacteria in the condition of light. The thesis also researched the effect of bactericidal rate on TiO₂/Ce. Through the analyzing of the individual elements,the results showed : The reaction time was 30 minutes ;The concentration of the Ce dopant was 3%; The calcinations temperature was 550℃.The better of the numberof time ,the better of photodegration effect.When there were UV and TiO₂/Ce ,it had the best bactericidal rate.It was enhanced strongly .The supreme bactericidal rate was 95.8%.It nearly killed the whole of bacteria.