中华医学超声杂志

应用化学 ›› 2010, Vol. 27 ›› Issue (06): 700-704.DOI: 10.3724/SP.J.1095.2010.90350

• 研究论文 • 上一篇    下一篇

Fe3+掺杂TiO2/凹凸棒复合光催化剂的制备和光催化活性

敏世雄*,王芳,魏立强,王永生,安红钢,吴冬青   

  1. (河西学院化学系 西部资源环境化学重点实验室 张掖 734000)
  • 收稿日期:2009-05-18 修回日期:2010-01-20 出版日期:2010-06-10 发布日期:2010-06-10
  • 通讯作者: 敏世雄，男，讲师; E-mail:msxwf@yahoo.com.cn; 研究方向：纳米半导体光催化
  • 基金资助:
    河西学院西部资源环境化学重点实验室面上基金资助项目（XZ0706）

Preparation and Photocatalytic Activity of Fe3+ Doped TiO2/Attapulgite Composite Photocatalyst

MIN Shi-Xiong*, WANG Fang, WEI Li-Qiang, WANG Yong-Sheng, AN Hong-Gang, WU Dong-Qing   

  1. (Department of Chemistry,Key Laboratory of Resources and Environmental
    Chemistry of West China,Hexi University,Zhangye 734000)
  • Received:2009-05-18 Revised:2010-01-20 Published:2010-06-10 Online:2010-06-10

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摘要：

用酸催化溶胶-凝胶法制备了Fe3+掺杂TiO2/凹凸棒（Fe3+-TiO2/ATP）复合光催化剂，对其结构、微观形貌、光吸收性能和可见光下的光催化性能进行了表征。XRD和TEM测试结果表明，Fe3+-TiO2/ATP具有较好的热稳定性，经450 ℃热处理后的ATP晶体结构基本保持不变，锐钛矿TiO2均匀的分布在ATP表面，TiO2颗粒之间无团聚，且平均粒径小于纯TiO2。UV-Vis-DRS测试结果表明，Fe3+的掺杂可明显增强复合光催化剂对可见光的吸收，光响应范围拓展到了整个紫外-可见光区。在可见光下，Fe3+-TiO2/ATP复合光催化剂对亚甲基蓝具有很好的催化降解活性。Fe3+-TiO2/ATP的反应速率常数分别为TiO2/ATP、P25和纯TiO2的1.37、4.83和6.51倍。复合光催化剂的沉降性能优于纯TiO2和P25，易于分离。

关键词: Fe3+掺杂, TiO2/凹凸棒, 复合光催化剂, 可见光, 亚甲基蓝, 光催化降解

Abstract:

Fe3+ doped TiO2/attapulgite composite photocatalyst(Fe3+-TiO2/ATP) was synthesized by acid-catalyzed sol-gel method, and the structure, morphology, light absorption properties and photocatalytic activity under visible light irradiation were investigated. XRD and TEM analyses reveal that the crystalline structure of ATP in the composite photocatalyst was found thermally stable after being treated at 450 ℃. TiO2 nanoparticles with anatase form were uniformly dispersed on the surface of ATP without aggregation and the average crystallitesize of TiO2 nanoparticles in the composite photocatalyst was smaller than that of the neat TiO2. UV-Vis-DRS shows that the doping of Fe3+ could extend the light response of the composite photocatalyst from UV to visible light region. The Fe3+-TiO2/ATP composite photocatalyst exhibited higher photocatalytic activity for the degradation of methyl blue(MB) and the determined apparent reaction rate constant were about 1.37 times that of TiO2/ATP, 4.83 times that of P25 and 6.51 times that of neat TiO2, respectively. Furthermore, the composite photocatalyst showed easy separation property compared with neat TiO2 and P25.

Key words: Fe3+ doping, TiO2/attapulgite, composite photocatalyst, visible light, MB, photocatalytic degradation

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