The Study Of Nano-TiO₂ Photocatalytic Decomposition Formaldehyde

At present, indoor air pollution is a major problem worldwide. Photocatalytic air purification is a novel and highly effective technology. air purification has been a major topic in the world. Many researches on the activity of photocatalysts and their loading technology have been studied in order to get better catalytic efficiency. The nanometer TiO₂ becomes the focus that people study because it is of high activity,security,non-poisonous feature,chemical stability,difficult dissolving,cost low advantage and so on, whose application prospect is extremely good. The formaldehyde is one of organic contamination that disserves severely daily lives and heath. So, this research regards formaldehyde as the catalysis goal. Mudification Fe³⁺, Ce³⁺, V⁵⁺, Mo⁶⁺ iron doped nanometer TiO₂ are prepared by sol-gel method and it is used as a catalyst forformaldehyde, which are regarded as the main content of studying. The property of catalyst was signified by XRD,SEM,UV-Vis etc. We studied relations with catalysis activity,doped component,consumption,initial density of formaldehyde, etc. The conclusions about our study are followed:P25 and commercial product of nano-TiO₂ powders are all better. The degradation rate of formaldehyde is: P25＞commercial product nano-titanium.On the other hand, The phase transformation can be controlled by the dopations of Fe³⁺, V⁵⁺, Ce³⁺, Mo⁶⁺ in the nano-TiO₂. The photocatalysts of nano-TiO₂ doped 0.5% Fe³⁺, V⁵⁺, Ce³⁺ , Mo⁶⁺ have better photocatalytic activity respectively. At the same synthesis condition and quantity of catalyst, the degradation rate of formaldehyde is:: Fe³⁺ doped TiO₂＞V⁵⁺ doped TiO₂＞Ce³⁺ doped TiO₂＞Mo⁶⁺ doped TiO₂. among them, Fe³⁺ doped TiO₂ has best photocatalytic activity.