催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (10): 905-909.

• 研究论文 • 上一篇    下一篇

硼硫共掺杂TiO2的光催化性能及掺杂机理

魏凤玉,倪良锁   

  1. 合肥工业大学化学工程学院, 安徽合肥 230009
  • 收稿日期:2007-10-25 出版日期:2007-10-25 发布日期:2011-10-28

Photocatalytic Performance and Doping Mechanism of B-S Co-doped TiO2

WEI Fengyu*, NI Liangsuo   

  1. School of Chemical Engineering, Hefei University of Technology, Hefei 230009, Anhui, China
  • Received:2007-10-25 Online:2007-10-25 Published:2011-10-28

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1161

被引次数

69

摘要： 采用水热法制备了硼硫共掺杂的TiO2光催化剂(TiO2-B-S), 并用其光催化降解甲基橙. 结果表明,在240 ℃下水热反应12 h时制得的TiO2-B-S具有较高的催化活性,紫外光照射50 min和太阳光照射230 min时对甲基橙的降解率分别达99.8%和81%. X射线粉末衍射、紫外-可见漫反射光谱和X射线光电子能谱等研究表明, TiO2-B-S为锐钛矿晶型,硫硼掺杂能抑制TiO2粒径的生长; TiO2-B-S同时具有较高的紫外光和可见光活性的原因可能是掺杂的硼以B3+进入晶格中,导致TiO2晶格畸变,带隙变窄. 掺杂的硼和硫还提高了TiO2的表面酸度和对可见光的吸收.

关键词: 硼, 硫, 共掺杂, 二氧化钛, 紫外-可见光催化活性, 甲基橙, 降解

Abstract: A B-S-co-doped TiO2 photocatalyst (TiO2-B-S) was prepared by the hydrothermal method.X-raydiffraction, ultraviolet-visible diffuse reflectance spectroscopy, andX-rayphotoelectron spectroscopy were applied to characterize the crystalline structure, light absorbing ability, and the chemical state of boron and sulfur in the photocatalysts. The results of photocatalytic degradation of methyl orange demonstrated that the TiO2-B-S catalyst prepared at 240 ℃ for12 hexhibited the highest photocatalytic activity, and the degradation ratio of methyl orange were 99.8% and 81% under UV light irradiation for 50 min and sunlight irradiation for 230 min, respectively. The characterization results revealed that TiO2-B-S is in conformity with the anatase TiO2, and the doping of boron and sulfur ions could efficiently inhibit the grain growth. Doped boron was present as the form of B3+in B-doped TiO2 samples, forming a possible chemical environment likeTi-O-B. The higher UV-visible light photocatalytic activity of co-doped TiO2 was attributed to the doped boron, which lowered the band gap and resulted in a localized crystal deformation. The doping of B and S enhanced the surface acidity and visible light absorption ability of TiO2. Photocatalytic activity of TiO2-B-S was enhanced due to the synergistic effect of B and S.

Key words: boron, sulfur, co-doping, titania, ultraviolet-visible photocatalytic activity, methyl orange, degradation