Abstract
TiO2 photocatalysts doped with three transition metal ions of varying concentration were prepared by adsorption phase synthesis. The influence of different metal ion species and contents on the morphology and crystallization of TiO2 sintered under various temperatures was explored by transmission electron microscopy, X-ray diffractometry, UVvis spectroscopy, and X-ray photoelectron spectroscopy. Photodegradation experiments on methyl-orange were employed to evaluate photocatalytic activity. Results indicated that 0.05 at.% Fe3+ and Cd2+ doping introduces lattice distortions as shallow trapping sites; moreover, doping improved the activity of adsorption phase synthesis (APS) catalysts. TiO2 crystallization was restricted when the doping content was greater than 0.05 at.% because other metal ions destroy the TiO2 lattice structure. Restriction also increased with doping content. An optimum doping content was observed during the preparation of TiO2 doped with Cd2+ and Fe3+. As the Fe3+ radius is close to the Ti4+ radius, the influence of Fe3+ doping content on TiO2 crystallization and activity was more apparent than that of Cd2+ doping content. Increases in sintering temperature resulted in fewer lattice distortions acting as shallow trapping sites and decreases in APS catalyst activities.
Keywords: Adsorption phase synthesis, methyl-orange, photodegradation, transition metal ions doping, TiO2.
Current Nanoscience
Title:Influence of Transition Metal Ion Doping on the Crystallization and Photocatalytic Activity of TiO2 Prepared Via Adsorption Phase Synthesis
Volume: 10 Issue: 6
Author(s): Ting Wang, Yingyan Zhu, Xinxin Wu, Caihong Yang, Yongqiang Cao and Liguang Wu
Affiliation:
Keywords: Adsorption phase synthesis, methyl-orange, photodegradation, transition metal ions doping, TiO2.
Abstract: TiO2 photocatalysts doped with three transition metal ions of varying concentration were prepared by adsorption phase synthesis. The influence of different metal ion species and contents on the morphology and crystallization of TiO2 sintered under various temperatures was explored by transmission electron microscopy, X-ray diffractometry, UVvis spectroscopy, and X-ray photoelectron spectroscopy. Photodegradation experiments on methyl-orange were employed to evaluate photocatalytic activity. Results indicated that 0.05 at.% Fe3+ and Cd2+ doping introduces lattice distortions as shallow trapping sites; moreover, doping improved the activity of adsorption phase synthesis (APS) catalysts. TiO2 crystallization was restricted when the doping content was greater than 0.05 at.% because other metal ions destroy the TiO2 lattice structure. Restriction also increased with doping content. An optimum doping content was observed during the preparation of TiO2 doped with Cd2+ and Fe3+. As the Fe3+ radius is close to the Ti4+ radius, the influence of Fe3+ doping content on TiO2 crystallization and activity was more apparent than that of Cd2+ doping content. Increases in sintering temperature resulted in fewer lattice distortions acting as shallow trapping sites and decreases in APS catalyst activities.
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Cite this article as:
Wang Ting, Zhu Yingyan, Wu Xinxin, Yang Caihong, Cao Yongqiang and Wu Liguang, Influence of Transition Metal Ion Doping on the Crystallization and Photocatalytic Activity of TiO2 Prepared Via Adsorption Phase Synthesis, Current Nanoscience 2014; 10 (6) . https://dx.doi.org/10.2174/1573413710666140901224436
DOI https://dx.doi.org/10.2174/1573413710666140901224436 |
Print ISSN 1573-4137 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-6786 |
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