S、RE共掺杂TiO_2的制备及其可见光分解水制氢性能  

Preparation of TiO_2 Co-doped with S and RE and Its Performance for Photocatalytic Hydrogen Evolution Under Visible Light Irradiation

作　　者：吴琛[1] 李越湘[1] 彭绍琴[1] 

机构地区：[1]南昌大学化学系,南昌330047

出　　处：《材料导报》2011年第20期66-69,共4页Materials Reports

基　　金：高等学校博士学科点专项科研基金(20060403006);国家重点基础研究发展规划资助项目(2009CB220003);国家自然科学基金(20763006);江西省自然科学基金(2010JZH0096)

摘　　要：采用溶胶-凝胶法制备了系列稀土(La、Eu、Nd、Tb、Er)和硫共掺杂TiO2光催化剂RE/S/TiO2。通过紫外-可见(UV-Vis)漫反射、X射线衍射(XRD)对催化剂进行了表征。以EDTA为电子给体,考察了光催化剂在可见光照射下的制氢活性。研究结果表明,S/TiO2具有可见光活性,稀土掺杂进一步提高了S/TiO2可见光活性,其活性顺序依次为Eu/S/TiO2>La/S/TiO2>Nd/S/TiO2>Tb/S/TiO2>Er/S/TiO2。与纯TiO2和S/TiO2光催化剂相比,稀土掺杂使催化剂的粒径减小,晶格畸变应力增大,从而提高了催化剂可见光制氢活性。A series of TiO2 co-doped with S and RE（La, Eu, Nd, Tb, Er） photocatalysts RE/S/TiO2 were prepared by sol-gel method. The photocatalysts were characterized by X-ray diffraction and UV-Vis diffuse reflectance spectroscopy. The activity of the prepared photocatalyst under visible light irradiation was evaluated by photocatalytic hydrogen evolution from water using EDTA as electron donor. It has been found that S/TiO2 has photocatalytic activity for hydrogen evolution under visible light irradiation and the activity can be improved by doped RE. The activity order is Eu/S/TiO2〉La/S/TiO2 〉Nd/S/TiO2 〉Tb/S/TiO2 〉Er/S/TiO2. Compared with that of pure TiO2 and S/ TiO2, the size of RE/S/TiO2 decreases, the lattice stress increases, and thus the photocatalytic activity of hydrogen evolution is improved.

关 键 词：光催化 RE/S/TiO2 可见光 制氢 

分 类 号：O643.32[理学—物理化学]