Au-decorated NaxH2-xTi3O7 nanobelts exhibiting remarkable photocatalytic properties under visible-light illumination

作者：Pu Ying Chih; Chen Yu Chih; Hsu Yung Jung^*

来源：Applied Catalysis B: Environmental , 2010, 97(3-4): 389-397.

DOI：10.1016/j.apcatb.2010.04.023

• Titanate
• Nanobelts
• Photocatalysis
• Visible-light-driven
• Charge separation

We demonstrated for the first time that Na-intercalated H2Ti3O7 (NaxH2-xTi3O7) NBs, prepared in the typical alkaline hydrothermal process, can effectively absorb visible light to carry out photocatalytic reactions. With the capability of effective light absorption in visible range, NaxH2-xTi3O7 NBs performed much better in the photoclegradation of thionine than the other three counterpart products including H2Ti3O7, mixed Na2Ti6O13/TiO2 and anatase TiO2 under visible-light irradiations. As compared to the relevant commercial products like P-25 TiO2 and Na2Ti3O7 powders, the as-synthesized NaxH2-xTi3O7 NBs exhibited superior photocatalytic efficiency under UV illumination, demonstrating their potential as an efficient photocatalyst in relevant redox reactions. A further enhancement in the photocatalytic activity can be achieved for NaxH2-xTi3O7 NBs when Au nanoparticles of suitable amount were deposited on their surfaces. This improvement is due to the band offsets between NaxH2-xTi3O7 and Au, which may promote charge carrier separation to favor the photocatalysis. The recycling test reveals that Au-decorated NaxH2-xTi3O7 NBs could be promisingly utilized in the long-term course of photocatalysis. Furthermore, the result of performance evaluation under natural sunlight shows that the current Au-decorated NaxH2-xTi3O7 NBs can be used as highly efficient photocatalysts which may practically harvest energy from sunlight.

• 出版日期2010-6-18