Experimental Research On The Degradation Of Indoor Formaldehyde By Photocatalysis Of Nitrogen-doped TiO₂ Powder Coated On Plasterboard

Photocatalysis is an indoor air purifying means which have the best development prospect,for its'facile react condition,little secondary pollution and less cost for maintaining,especially for it is possible to use daylight as the light source. At present, the factors that influent the reaction such as reactive condition, photocatalysis preparing, have been widely researched. The solid support varied from laboratory articles to more practical material.The plasterboard which widly used in roof decoration is adopted to be the solid support for it's widly using in indoor decoration in big size and large specific surface area.The nitrogen-doped TiO2-photocatalytic powder and pure TiO2 powder was prepared by the improved Sol-Gel method, and the crystalline properties were characterized by X-ray diffraction (XRD).It shows that: The nitrogen-doped TiO2 on plasterboard photocatalytic powder's crystalloid type is major in anatase and the grain pathway is well-proportioned, with it's diameter about 19nm; The nitrogen-doped TiO2 film prepared with the optimum parameters was loaded on the faces of plasterboardThe photocatalytic activity of the nitrogen-doped TiO2 powder on the plasterboard was studied through experiments, that indicate: in 300 minutes and under incandescent light, organic adhesive's degradation efficiency to middle concentration formaldehyde is 43.1%, a little higher than inorganic adhesive's 38.3% and much higher than powder sintering's 25.8%; in the same reaction condition, the felt loading methed has 13~16% higher degradation efficiency than sintering because of the different adsorptivity.The factors such as loading matheds of the TiO2 on plasterboard,nitrogen doped and light source are analysed. The TiO2-photocatalytic powder increased the response of TiO2 to visible-light with nitrogen doped, but decreased the response of TiO2 to ultraviolet radiation.At last,the serviceable abilities and economy benefit of TiO2-photocatalytic powder were investigated, the results indicated that:①The plasterboard with nitrogen-doped TiO2 photocatalytic powder loaded on with adhesive, in real use, has degradation efficiency above 15% in 300 minute and 75.5% in 24 hour, firm loading on the plasterboard and no necserary to clean,so it's physics performance make it suit to be a product used to purify indoor air pollution. ②Producing the plasterboard with photocatalytic function can get 3.65 yuan more per centiare than common one, so to the producer, it has much higher economy benefit;on the other hand, use the plasterboard with photocatalytic function as the roof decorative material,the extra pay is 6 yuan per entiare。...