不同方法制备硫掺杂TiO_2及其可见光催化性能研究

Photocatalytic activity of sulfur-doped titania under visible-light prepared by different methods

采用水热法和焙烧法分别制备了硫掺杂纳米TiO2,通过扫描电子显微镜、X射线光电子能谱和紫外可见漫反射光谱进行了表征,以水体中的甲基橙(MO)为模拟污染物,研究了硫掺杂纳米TiO2的可见光光催化性能。结果表明,2种不同制备方法得到的硫元素掺杂TiO2均表现出可见光活性。硫元素在TiO2中分别取代了O2和Ti的位置,改变了TiO2原来的能带结构,形成新的杂质能级,从而使TiO2的吸收区间由紫外拓展到可见光区。

Sulfur-doped titania （S-TiO2） with response to visible light was prepared by hydrothermal and calcination method. The as-synthesized S-TiO2 was characterized by SEM, UV-Vis and XPS techniques. Their photocatalytic activity for decomposition of methyl orange were tested under visible light. The results showed that the sulfur-doped titania prepared by the two methods exhibited catalytic activity under visible light. Sulfur substituted O2 and Ti in titania and changed the energy band to form a new impurity energy level, which expanded the absorbance range from ultraviolet to visible light.