复合纳米光催化环保涂料制备及其超临界CO_2喷涂研究 Ⅰ.纳米SO_4^(2-)/TiO_2-(Ag,Fe)光催化剂制备及其表征

Preparation of Nanometer SO_4^(2-)/TiO_2-(Ag,Fe) Composite Photocatalytic Coating and Research of Supercritical CO_2 Spraying Ⅰ.Preparation and Characterization of Nanometer SO_4^(2-)/TiO_2-(Ag,Fe)

为了得到太阳光下具有催化活性强,光响应范围宽的纳米光催化剂,将其用于复合纳米TiO2基环保涂料,使涂膜产生自洁和净化大气的功能。用不同工艺制备纳米SO42-/TiO2,用Ag,Fe对制备的纳米TiO2粒子进行共掺杂改性,得到纳米SO42-/TiO2-(Ag,Fe)。通过光催化活性、XRD,FT-IR及DRS表征,表明用超临界CO2干燥制备的纳米SO42-/TiO2具有超强酸性质,可有效提高纳米TiO2的光量子效率,光催化活性强;用Ag,Fe共掺杂,产生了协同效应,能使纳米TiO2光吸收范围扩展到可见光区。

In this study, we try to gain nanometer photocatalyst with better photocatalytic activity and wider range of photoresponse,and apply it to nanometer TiO2-BASED composite coating that have the functions of photocatalytic self-cleaning and atmosphere purification. Nanometer solid acid SO4^2-/TiO2 was prepared with different methodologies and was co-doped with silver and ferrum to form nanometer SO4^2-/TiO2-（Ag,Fe）.The products were characterized by photocatalytic activities,XRD,FT-IR and DRS. The results showed that the nanometer SO4^2-/TIO2 particles prepared by supercritical CO2 drying had better photocatalytic activity, superacid properties and more efficient photo-quantum effect .（Ag, Fe） co-doped SO4^2-/TIO2 brought about cooperativity effect, extending the light absorption width into visible spectrum.