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Preparation and Characterization of Graphene/Titanate Nanotubes Photocatalysts

Author: DiZuoZuo
Tutor: HuGuoXin
School: Shanghai Jiaotong University
Course: Engineering Thermophysics
Keywords: Graphene Titanate nanotubes Photocatalyst Visible light activity Sensitizing effect
CLC: TB383.1
Type: Master's thesis
Year: 2012
Downloads: 178
Quote: 0
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Abstract


With the increasingly serious environmental pollution, the development of the semiconductor photocatalyst has attracted the attention and interest of the people. The emerging material graphene has unique electrical and optical properties, graphene hybrid titanium dioxide composite photocatalyst has aroused great concern of researchers. Currently, the graphene hybrid P25 and graphene hybrid anatase type nano-titanium dioxide particles composite photocatalyst has been successfully prepared, and has excellent photocatalytic activity. However, due to the P25 and the limitations of the titanium dioxide nano-particle morphology, currently prepared composite photocatalyst specific surface area are relatively small, which leads to its ability to adsorb pollutants is limited, restricting further improve their photocatalytic activity. This topic preparation and characterization of large specific surface area of ??graphene hybrid titanate nanotube composite photocatalyst investigated its catalytic properties and catalytic mechanism. The following major elements: (1) the subject using the chemical reduction of graphene, P25 and nano-sized anatase type titanium dioxide particles as the raw material, the use of Hydrothermal Synthesis of a series of graphene hybrid titanate nanotubes composite photocatalyst. The first time the combination of graphene and tubular titanium dioxide substances. The specific surface area of ??the subject prepared composite photocatalyst the original graphene hybrid composite photocatalyst titanium dioxide nanoparticles than the surface area of ??more than 10 times, to achieve a large specific surface area of ??graphene - reported in the literature titanate nanotubes composite light Preparation of the catalyst. The all prepared composite photocatalyst having a good photocatalytic performance and visible light activity under visible light irradiation conditions, degradation of Rhodamine-B, rate constants are reported in the original literature titanium dioxide photocatalyst 5 times. (2) This research project product photocatalytic properties of graphene content and hydrothermal temperature, and optimized graphene content and hydrothermal temperature. Graphene content is too high or too low is not conducive to the catalytic activity of composite photocatalyst. Synergistic effect exists between the graphene and titanate nanotubes only when graphene content is moderate in order to make products having the highest photocatalytic activity. Hydrothermal reaction temperature on the the composite photocatalyst catalytic performance has an important impact, The hydrothermal temperature lower product has a relatively large specific surface area and high adsorption capacity. Therefore, low-temperature hydrothermal prepared composite photocatalyst with superior catalytic performance. Play the role of the photosensitizing agent under visible light irradiation graphene by composite photocatalyst degradation of Rhodamine-B study found. In the presence of UV irradiation graphene titanate nanotubes photo-generated electron - hole pair separation can improve, improve the utilization of photo-generated electrons and holes. (3) prepared composite photocatalyst were characterized by means of TEM, XRD, UV-vis diffusion reflection spectroscopy, XPS test results by product morphology, optical properties, as well as elemental chemical states of graphene content affect the composite light Catalyst capacity will be explained. The proposed graphene hybrid composite photocatalyst degradation mechanism of Rhodamine-B, respectively, in the ultraviolet and visible light irradiation. And the use of the EPR and photocurrent tested composite photocatalysts graphene sensitized to visible light activity sources. (4) A preliminary study of a hybrid graphene the titanate nano tube composite photocatalysts for water splitting preparation of hydrogen capacity. Analysis the Graphene content and hydrothermal reaction temperature on the decomposition of water preparation of hydrogen activity.

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