镧硫共掺杂TiO_2光催化剂的制备及其可见光活性研究

Preparation of La^(3+)/S/TiO_2 Photocatalyst and its Visible Light Activity

首次采用共沉淀-浸渍两步法合成了一系列新型La3+/S/TiO2半导体光催化剂,并使用透射电子显微镜(TEM)观察了催化剂颗粒的大小和形态。使用氙灯为光源研究了催化剂光降解酸性蓝(AB62)溶液的催化活性。研究了制备催化剂时焙烧温度、焙烧时间和La3+掺杂量对催化剂活性的影响。结果表明,当La3+掺杂量为2.5%,在300℃下焙烧2h时,所得催化剂对酸性蓝具有最高的光催化活性。与单一的TiO2和单独La3+或者S掺杂的光催化剂比较,La3+/S/TiO2具有相对较高的催化活性。

A novel La^3＋/S/TiO2 nano-photocatalyst was prepared by precipitation-doping method. Transmission electron microscopy （TEM） was employed to characterize the particle size and the shape of the sample. The photocatalytic activities of La^3＋/S/TiO2 were evaluated using the photodegradation of acid blue 62 as a probe reaction under the irradiation of Xenon light. The effect of preparation conditions such as calcinate temperature, calcinate time and the amount of La^3＋ were studied. The results showed that the photocatalyst doped with 2. 5%（in rnass）La^3＋ and calcinated 2 h in 300℃ displayed an excellent photocatalytic activity in degrading the acid blue 62. Compared with pure TiO2, S-doped TiO2 and La^3＋ -doped TiO2,La^3＋/S/TiO2 had the maximum photocatalytic activity.