Photocatalytic Oxidation of NO_ x with Porous TiO_2 Nanometer Thin Film

0　IntroductionNitrogen oxides (NOx) generally are referred only to themajor species: nitric oxide (NO) and nitrogen oxides(NO2) in air pollution control. NOx is responsible for ozonedepletion and urban smog through photochemical reactionswith h…

Photocatalytic Oxidation of NOx with Porous TiO2 Nanometer Thin Film

A new kind of porous nano\|TiO 2 composite films was prepared on the glass substrate with the water glass as binders and the sodium fluorosilicate as solidifying reagent. The morphologies of the films were studied by scanning electron microscope(SEM). The UV\|Vis spectrophotometer was also used to investigate the absorption of the films. The gas\|phase photocatalytic oxidation of nitrogen oxides on the composite film was carried out in TiO 2 /UV system, and some important factors affecting the photocatalytic oxidation were also studied such as the catalyst concentration, vapor pressure and the presence of oxygen. The results showed the conversion of NO x reached 97.5% after 2 h UV\|irradiation. The final product of photo\|oxidation was detected to be HNO 3 by FT\|IR. The way of photocatalytic oxidation of NO x was possibly useful in the practical application.