Hydrothermal synthesis and photocatalytic activity of combination of flowerlike TiO_2 and activated carbon fibers

摘要

The three-dimensional flowerlike TiO_2 microstructure was successfully deposited on the surface of activated carbon fibers (ACFs) pre-coated with TiO_2 seed layer via a hydrothermal process. The flowerlike structure was constructed by rutile-phased TiO_2 rods and the formation mechanism of anchoring TiO_2 onto ACF to form the TiO_2/ACF composite was also discussed. The TiO_2/ACF exhibited a relatively higher photocatalytic activity than the nanometer rutile TiO_2 in the degradation of methyl orange, presumably due to a red shift, restraint of the photogenerated hole and electron recombination and high light-harvesting efficiency. In addition, the TiO_2/ACF is favorable to reuse by emptying off the supernatant solution.