Fe^(3+)及S-N共掺杂TiO_2纳米材料的制备及其光催化性能

Preparation and photocatalytic property of Fe^(3+) and S-N co-doped TiO_2 nanomaterials

以硫脲、硝酸铁、钛酸四丁酯分别作S、N、Fe和Ti源,利用sol-gel法制备了一系列Fe3+和S-N掺杂的TiO2光催化纳米材料(Fe3+/TiO2、S-N/TiO2、Fe3+/S-N/TiO2).利用X射线光电子能谱(XPS)、X射线衍射(XRD)、透射电镜(TEM)、紫外-可见光谱(UV-Vis)等技术进行表征,以亚甲基蓝(MB)的降解为模型反应,评价样品的光催化性能.结果表明,Fe3+、S-N的共掺杂将TiO2的光谱响应范围拓宽到可见区,使TiO2在紫外和太阳光下的催化活性得到显著改善,MB溶液在各样品上的催化降解脱色速率常数k1分别为:0.17(TiO2)、0.22(S-N/TiO2)、0.32(Fe3+/TiO2)和0.42h-1(Fe3+/S-N/TiO2),共掺杂材料Fe3+/S-N/TiO2的高催化活性归因于掺入的Fe3+和S-N协同作用的结果.

Fe^3＋ and S-N-doped TiO2 nanomaterials（Fe^3＋ TiO2, S-N/TiO2 and Fe^3＋/S-N/TiO2） are prepared by sol-gel method and characterized by X-ray photoelectron spectroscopy（XPS）, X-ray diffraction（XRD）, transmission electron microscopy （TEM）, and UV-visible （UV-Vis） techniques. The degradation of dye methyl blue（MB） is used as the model reaction to investigate the photocatalytic property of the as-prepared samples. The results show that co-doping Fe^3＋ and N-S into TiO2 induce the red-shift of its absorption edge to the visible-light region and its photocatalytic property is remarkably enhanced under both UV and sun lights and the rate constants k1 of the degradation of MB solution are 0.17（TiO2）, 0.22（S-N/TiO2）, 0.32（Fe^3＋/TiO2） and 0.42 h^-1 （Fe^3＋/S-N/Ti02）, respectively. The enhanced photocatalytic property of the sample Fe^3＋/S-N/TiO2 is a synergistic effect of doped Fe3＋-S-N, which brings about an enhanced transfer and separation of photogenerated charge carriers.