Effect of Transition Metal Ion Doping on the Photocatalytic Activities of TiO₂ Synthesized by Sol-Gel Method

Abstract:

Pure TiO₂ , Ti _0.75 Fe_0.25 O₂, Ti_0.75 Ni_0.25 O₂, Ti_0.75 Co_0.25 O₂ nanocrystals were prepared by low temperature sol-gel method. The samples were characterized by using transmission electron microscope, X-ray diffractometer and ultraviolet-visible spectrophotometer to study the effect of transition metal ions on the photocatalytic properties of TiO₂ nanocrystals. The results show that the pure TiO₂ and Ti_0.75 Fe_0.25 O₂, Ti_0.75 Ni_0.25 O₂, Ti_0.75 Co_0.25 O₂ nanocrystals were granular and the size of which is 3.5, 2.9, 3.6, 3.9 nm, respectively. The titania anatase phases appear in the pure TiO₂ , the Ti_0.75 Fe_0.25 O₂, Ti_0.75 Ni_0.25 O₂, Ti_0.75 Co_0.25 O₂. The absorption edge of Ti_0.75 Fe_0.25 O₂occur red shift comparing with that of pure TiO₂ and the absorption edge of Ti_0.75 Fe_0.25 O₂and Ti_0.75 Fe_0.25 O₂occur blue shift comparing with that of pure TiO2. The photocatalytic properties of pure TiO₂, Ti_0.75 Fe_0.25 O₂, Ti_0.75 Fe_0.25 O₂, Ti_0.75 Fe_0.25 O₂nanocrystals synthesized at low temperature by sol-gel method were investigated by degrading the methyl orange solution under ultraviolet irradiation. The degradation rate of Ti_0.75 Fe_0.25 O₂is the highest (60%) and that of Ti0.75Co0.25O2 (10%) is the lowest among these catalysts after degradation for 120min.The result shows that the photocatalytic property ofTi_0.75 Fe_0.25 O₂nanocrystals synthesized at low temperature is obviously better than that of pure TiO₂ and Ti_0.75 Fe_0.25 O₂, Ti_0.75 Fe_0.25 O₂.

• Periodical: Advanced Materials Research (Volumes 562-564)
• Pages: 260-264
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.562-564.260
• Online since: August 2012
• Authors: Min Zhong, Jing Jing Yu, Zhi Hao Wei, Ping Zhan Si
• Keywords: Photocatalytic Properties, Sol-Gel (SG), TiO₂, Transition Metal Ions

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