Abstract:
In order to investigate the preparation method and photocatalytic properties of composites comprised by reduced graphene oxide (RGO) and TiO
2 with high activity facets, RGO/nano TiO
2 composites were prepared by two-step hydrothermal method: the 1st step was the synthesis of nano TiO
2 exposed with high activity facets; the 2nd step was the recombination of as-synthesized nano TiO
2 and graphene oxide (GO), thus RGO/nano TiO
2 composites were formed. Then, the prepared nano TiO
2 with different exposed facets and RGO/nano TiO
2 composites were characterized by means of XRD, SEM, X-ray photoelectron spectrometer, ultraviolet-visible diffuse reflectance spectroscopy and so on, and the photocatalytic properties were evaluated. The results show that during the 1st step of hydrothermal method, nano TiO
2 which has high activity (001) and (101) facets can be controllably prepared by adjusting the concentration of HF. Fluorine atoms exist in nano TiO
2 by two states of physically adsorbing state and chemically binding state. After the 2nd step, GO recombines with nano TiO
2 to form RGO/nano TiO
2 composite, and GO is transformed to RGO simultaneously in the process. RGO/nano TiO
2 composites synthesized by two-step hydrothermal method have favorable photocatalytic performances under ultraviolet illumination, which outperform those of commercial TiO
2 (P25) and nano TiO
2. The photocatalytic properties of RGO/nano TiO
2 composites have remarkable improvement. RGO and exposed facets of TiO
2 have effects on the photocatalytic activity.
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