Preparation Of Ion-doped Nanometer TiO₂ Photocatalyst And It's Application In Degradation Of NO₂～-

The nanometer TiO₂ becomes the focus that people study because it is of high activity, security, non-poisonous feature, chemical stability (able to bear chemistry and corrodes ) , difficult dissolving, cost low advantage and so on, whose application prospect is extremely good. At present, the nanometer TiO₂ is often used as a catalyst for the organic pollution. It is ignored that the nanometer TiO₂ is used as a catalyst for the inorganic pollution. NO₂^- ion is a carcinogenic matter and a prejudicial environmental pollutant that stems from nitrogen oxide of air mainly and exists in air and water. So, this research regards NO₂^- ion as the catalysis goal. Fe³⁺, Ce³⁺, V⁵⁺ ion doped nanometer TiO₂ are prepared by sol- gel method and it is used as a catalyst for NO₂^-, which are regarded as the main content of studying. The property of catalyst was signified by XRD, SEM, TEM, UV-Vis etc. We studied relations of , with catalysis activity, synthetic technology of catalyst, doped component, catalyst consumption, initial density of NO₂^- ,etc. The conclusions about our study are followed:(1) At the same process conditions, The role of adulteration is very important to depress the phase to transit from anatase to rutile when the quantity of adulteration (Fe³⁺, Ce³⁺, V⁵⁺ ) less than 5%.(2) At the same synthesis condition and quantity of catalyst, the degradation rate of NO₂" is: Fe³⁺ doped TiO₂ > Ce³⁺ doped TiO₂ > TiO₂ > V⁵⁺ doped TiO₂(3)The degradation rate of single phase nanometer TiO₂ is higher than that of mixed nanocrystal TiO₂ phase, for example, anatase + rutile. The smaller the crystalline grain is, the better the catalysis effect is. When catalyst density s at the 1g/L, degrade effect is to be relatively better, The higher initial density of solution is, the more difficultly the photocatalysts degrade NO₂^-.