Citation: GAO Yue-Jun, XU Yi-Ming. Effect of Fluoride Doping and Adsorption on the Photocatalytic Activity of TiO₂[J]. Acta Physico-Chimica Sinica, ;2012, 28(03): 641-646. doi: 10.3866/PKU.WHXB201201161 shu

Effect of Fluoride Doping and Adsorption on the Photocatalytic Activity of TiO₂

GAO Yue-Jun ,
XU Yi-Ming

1.
Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China

Received Date: 25 September 2011
Available Online: 16 January 2012
Fund Project: 国家自然科学基金(20873124) (20873124)国家基础研究发展计划(973) (2011CB936003)资助项目 (973) (2011CB936003)

It has been reported that bulk doping or surface modification of TiO₂ with fluoride ions can enhance its photocatalytic activity for degradation of organic compounds in water. The effect of the former is ascribed to enhanced separation of photogenerated charge carriers through the surface-formed Ti3 + species, whereas that of the latter is ascribed to enhanced desorption of hydroxyl radicals through the interfacial fluoride ions. However, the difference in activity between two modified catalysts has not been investigated. In this work, different fluoride-doped samples were hydrothermally prepared from butyl titanate and NH₄F. Their photocatalytic activities after addition of NaF or AgNO₃ to the aqueous suspension were evaluated using phenol degradation as a model reaction. All the fluoride ions in the oxide lattices and in the outer and inner Helmholtz double layers of TiO₂ were positive to phenol degradation, but the magnitude of their influences followed a decreasing order. Moreover, phenol degradation in the presence of both NaF and AgNO₃ was much faster than the sum of their individual rates. These results indicate that combination of conduction band electron reduction and valence band hole oxidation is an effective way to improve the quantum yield of TiO₂ photocatalysis.
- Photocatalysis,
- Titanium dioxide,
- Fluorine ion,
- Doping,
- Adsorption
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Effect of Fluoride Doping and Adsorption on the Photocatalytic Activity of TiO₂