Generation of Graphene-titanium Dioxide Nanotubes Catalytic Board and Its Photocatalysis Capability to Degrade Pentachlorophenol
Author(s): XU Qi, ZHOU Ze-yu, WANG Hong-tao, School of Environment, Tsinghua University
Pages: 3079-3085
Year: 2016 Issue: 8
Journal: Chinese Journal of Environmental Science
Keyword: graphene-titanium dioxide nanotubes; catalytic board; soil washing; PCP; photocatalysis;
Abstract: 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 longterm use. The application of the board could solve the problem of immobilized catalyst and enable catalyst recycling in subsequence processing.
Pages: 3079-3085
Year: 2016 Issue: 8
Journal: Chinese Journal of Environmental Science
Keyword: graphene-titanium dioxide nanotubes; catalytic board; soil washing; PCP; photocatalysis;
Abstract: 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 longterm use. The application of the board could solve the problem of immobilized catalyst and enable catalyst recycling in subsequence processing.
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