[Generation of Graphene-titanium Dioxide Nanotubes Catalytic Board and Its Photocatalysis Capability to Degrade Pentachlorophenol]

Considering that the photocatalysts used in research are generally in powder form, which increase the difficulty of efficient recycle in practice, this research focused on the generation of graphene-titanium dioxide nanotubes catalytic board. Graphene oxide and TiO₂ powder were used as precursors; the sol-gel like coating method along with hydrothermal method was adopted to synthesize the catalytic board. The generated board presented a uniform surface morphology and in its most regions, the catalyst was loaded in the form of a single layer or few layers. During the photodegradation process in the eluent system, under solar irradiation, the removal ratio of the pentachlorophenol (PCP) could reach almost 100% within 30 min, the degradation rate was increased by more than 5 times compared with the eluent without addition of photocatalyst; while under xenon lamp, the degradation rate was increased by 10 times. After long-time soaking and repeated use, the photocatalytic activity of the board did not decrease obviously, which is suitable for long-term use. The application of the board could solve the problem of immobilized catalyst and enable catalyst recycling in subsequence processing.