Abstract
TiO2 microcrystals exposing {001} facets are of potential applications in photocatalysis; however, the photocatalytic activity is limited by micrometer sizes. Herein, we report a compositing tactic to compensate the photocatalytic activity through surface decorations with few-layer TiO2 nanobelts. Hydrothermally synthesized anatase TiO2 microcrystals exposing (001) facets were immersed in a precursor solution at 60 °C, on which hydrogen titanate nanobelts precipitated vertically on the surface. A subsequent calcination in air at 400 °C was followed to decompose titanate nanobelts to anatase TiO2 with the nanostructure maintained. The coverage of TiO2 nanobelts can be controlled by varying the immersing duration. When utilized to assist photodegradation of phenol in water under UV light illumination, the composited TiO2 exhibited a reaction rate constant 2.3 times that of the pristine TiO2 microcrystals. A synergetic effect arising from the microcrystals and surface decorated nanobelts is believed to contribute to the enhanced photocatalytic activity.
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