常压干燥法制备铁掺杂二氧化钛气凝胶

Preparation of Fe Doped TiO_2 Areogel by Ambient Pressure Drying

以钛酸四丁酯(TTIP)为原料、硝酸铁为掺杂剂、冰醋酸为催化剂、甲酰胺为干燥控制化学添加剂,采用溶胶-凝胶法制备Fe3+掺杂TiO2醇凝胶,并结合常压干燥工艺,实现了Fe3+掺杂TiO2气凝胶的常压干燥法制备。采用XRD、BET、SEM、IR等对样品进行检测。结果表明:制备态Fe3+掺杂TiO2气凝胶密度为0.24 g/cm3,比表面积为529.17 m2/g,平均孔径约为20.10 nm,晶型为无定形;经850℃空气气氛下煅烧2 h后,样品转变为锐钛矿型结构,平均孔径增大到22.32 nm,比表面积为136.22 m2/g。通过甲基橙溶液光催化降解实验,相比未掺杂二氧化钛气凝胶,掺入nFe∶nTi=0.05时,样品具有更高的光催化性能。

Monolithic TiO2 aerogels doped with iron was prepared by sol-gel method and subsequent process with ambient pressure drying using titanate tetrabutoxide, acetic acid and formamide as raw material. The structures of samples were characterized by means of XRD, BET, SEM and FT-IR et al. The results indicate that as-prepared iron-TiO2 g/cm^3, the specific surface area of 529.17 m^2 aerogel is in amorphous state with bulk densities of 0.24 /g and average pore size of 20.10 nm. After calcined at 850 ℃ in air anatase is the main crystalling phase and the surface area is 136.22 ma/g. A test of photo- catalytic degradati possesses a better on in methyl orange solution finds that TiO2 aerogel doped with 0.05mol% of Fe3＋ catalytic efficiency compared with pure TiO2 aerogel.