【摘要】 以钛酸丁酯为前驱物,采用溶胶-凝胶-水热晶化法制备了锐钛型氟掺杂TiO2(F-TiO2)溶胶;把F-TiO2溶胶涂覆在荧光灯管上,经低温(120~280℃)烘干后,制备了具有光催化净化空气功能荧光灯.以含有甲醛的空气为模拟污染空气,评价了荧光灯管的光催化净化活性,并且测定了溶胶干燥制得的粉末物的吸附性能.运用紫外-可见漫反射光谱(UV-V is-DRS)及原子力显微镜(AFM)研究了在玻璃表面形成的F-TiO2膜的有关特征.结果表明:锐钛矿型纳米F-TiO2溶胶具有良好的降解甲醛和净化空气的能力,当甲醛浓度小于5.4mg/m3及流速小于0.015 L/m in时,催化降解率高达90%.F-TiO2膜具有荧光性,涂膜后的荧光灯光强度增加2%~3%;氟的掺杂提高了催化剂的表面酸度、晶化度和吸附能力,从而有效地提高了F-TiO2膜的催化活性.更多还原

【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 formaldehyde-degrading ability was then fabricated by coating F-TiO₂ sol on the surface of a common fluorescent lamp and drying the film at 120 to 280℃,and the photocatalytic refining activity of the lamp was evaluated by using the air containing formaldehyde as the simulated contaminated air.Moreover,the adsorption performances 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 formaldehyde content and the flow rate are respectively less than 5.4mg/m³ 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.更多还原