Abstract:

Fluorine-doped anatase TiO2(F-TiO₂)sol was prepared by means of the sol-gel-hydrothermal crystallization method with tetrabutyl titanate as the precursor.A photocatalytic film.coated fluorescent lamp with good formal-dehyde-degrading ability was then fabricated by coating F-TiO₂ sol on the surface of a common fluorescent lamp and drying the film at 1 20 to 280℃ .and the photocatalytic refining activity of the lamp was evaluated by using the air containing form aldehyde as the simulated contaminated air.Moreover,the adsorption perform ances of the dried F-TiO₂,sol particles were measured.and UV-Vis-Diffuse Reflectance Spectroscopy(UV-Vis-DRS)and Atomic Force Microscopy(AFM)were finally adopted to investigate the characteristics of the F-TiO₂ film coated on the glass surface.The results indicate that(1)the nano．sized anatase F-TiO₂ sol is of good formaldehyde—degrading performance and photocatalytic ability;(2)the degradation rate of formaldehyde is up to 90% when the initial
rmaldehyde content and the flow rate are respectively less than 5.4 mg/m and 0.015 L/min;(3)the brightness of the catalyst.coated fluorescent lamp is improved by 2%~3% due to the fluorescence of F-TiO₂ film;and(4) the doping of F improves the surface acidity,the crystallization degree and the adsorption capability of the photocatalyst,thus effectively enhancing the photocatalytic activity of the F-TiO₂ film.

Key words: TiO₂ sol, photocatalyst, fluorescent lamp, form ahtehyde, degradition