纺织学报 ›› 2013, Vol. 34 ›› Issue (3): 20-26.

• 纤维材料 • 上一篇    下一篇

吸附相反应制备过渡金属离子掺杂TiO2光催化剂

王挺 汤方鹏 邢俊 毛彦东 吴礼光   

  • 收稿日期:2012-03-21 修回日期:2012-09-28 出版日期:2013-03-15 发布日期:2013-03-07
  • 通讯作者: 吴礼光 E-mail:wulg64@hotmail.com
  • 基金资助:

    国家自然科学基金资助项目;浙江省自然科学基金资助项目

Preparation of TiO2 photocatalysts doped with transition metal ions by adsorption phase synthesis

  • Received:2012-03-21 Revised:2012-09-28 Online:2013-03-15 Published:2013-03-07

摘要: 利用吸附相反应制备了金属离子掺杂的TiO2光催化剂,并结合甲基橙光降解实验研究不同离子、不同离子掺杂量对复合催化剂活性的影响。TEM和紫外可见光谱分析显示,掺杂对复合光催化剂的形貌和吸收光谱均无影响。XRD表明,掺杂金属离子进入了TiO2的晶格结构而抑制其结晶。掺杂的离子大小与Ti4+越接近,掺杂量越高,其对TiO2结晶的抑制越明显。光降解实验表明,Fe3+和Cd2+的掺杂都存在最优掺杂量,但不同离子半径导致了不同的最优掺杂量。低掺杂量的Co2+对复合催化剂的活性没有影响,较高的Co2+掺杂量容易引起截流子复合而降低了其催化活性。

关键词: 金属掺杂, 吸附相反应技术, TiO2 , 结晶过程, 甲基橙

Abstract: TiO2 photocatalysts doped with different metal ions were prepared by adsorption phase synthesis. Then, photodegradation experiments of methyl-orange were employed to evaluate the influence of different metal ions and different ion quantities on the activity of these photocatalysts. The results from TEM and UV-visible spectra showed that metal ions doping affected little the morphology and light absorbance of TiO2. XRD indicated that the replacement of Ti4+ in TiO2 lattice structure by other metal ions restricted the crystallization of TiO2. The restriction on the crystallization became stronger, when ions radius was close to Ti4+ or quantities of doping ions increased. The results in photodegradation experiments suggested that there was an optimum dopant quantities appeared during preparation of TiO2 doped with Cd2+ and Fe3+. Due to various ion radiuses, the optimum dopant quantities of Cd2+ and Fe3+ were also different. Co2+ doping under low quantities influenced little on the activity of photocatalysts. The activity of photocatalysts was obviously depressed after doping by metal ions under high quantities, since the photo-induced carriers would annihilate easily.

Key words: metal ions diping, adsorption phase synthesis, TiO2, crystallization, methyl-orange

中图分类号: 

  • O643
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