B/Fe_2O_3共掺杂纳米TiO_2可见光下的催化性能

Photocatalytic activity of nano-TiO_2 codoped with boron and Fe_2O_3 in visible region

采用溶胶凝胶法制备B/Fe2O3共掺杂TiO2复合光催化材料,并用X射线衍射仪(XRD)、扫描电镜(TEM)和紫外可见漫反射光谱(DRS)对粉体进行表征。结果表明:催化剂以锐钛矿存在的纳米颗粒,直观地显示了物质的形貌,掺杂B能极大提高催化剂的可见光响应。以二氯苯酚(DCP)为降解物质,在紫外和可见光下分别研究了复合催化剂的光催化活性。掺杂B能使吸收光谱红移至可见光区,而进一步掺杂Fe2O3大大提高了催化剂的活性。

Sol-gel method is used to prepare the photocatalysts. And it was characterized by X-ray diffractometry （XRD）, TEM and UV-Vis diffuse reflectance spectra （DRS）. The XRD results show that a structure composed only of anatase forms after calcination and the grain sizes are very small and separated uniformly, TEM shows analysis the characters of the figures, DRS results verify that TiOz doped with B extends its absorption band significantly into the visible region. The 2, 4-dichlorophenol（DCP） was chosen as target pollutant, the degradation rate and the mineralization rate of the pollutants in the samples under both UV and visible light were investigated. The results show that the effect of B doping in TiOz can extend the spectral response to the visible region and that the reaction activity is extraordinarily enhanced when it is further loaded with Fe2 O3.