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Graphene/mesoporous titanium dioxide visible light catalyst and preparation method

A mesoporous titanium dioxide and titanium dioxide technology, which is applied in the fields of nanocomposite materials and photocatalysis, can solve the problems of irregular morphology, single titanium dioxide structure, poor visible light catalytic effect, etc., and achieves uniform size, excellent photocatalytic activity, and simple preparation process. safe effect

Inactive Publication Date: 2012-02-15
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a convenient and quick method for preparing graphene / titanium dioxide nanocomposite photocatalysts and their preparation methods for the problems of single structure of titanium dioxide, irregular appearance, and poor catalytic effect of visible light. Method for Porous Titanium Dioxide Nanocomposite Visible Light Catalyst

Method used

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  • Graphene/mesoporous titanium dioxide visible light catalyst and preparation method
  • Graphene/mesoporous titanium dioxide visible light catalyst and preparation method
  • Graphene/mesoporous titanium dioxide visible light catalyst and preparation method

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Embodiment 1

[0025] Add 20 mg of graphene oxide to 80 mL of glacial acetic acid, ultrasonicate for 2 hours to obtain a graphene oxide dispersion, then add 1 mL of n-butyl titanate dropwise to the above graphene oxide dispersion, and place on a magnetic stirrer Continue to stir for 30 minutes, then transfer the above mixed solution to a 100 ml hydrothermal reaction kettle, and react at 160°C for 30 hours. After the hydrothermal reaction product is separated by high-speed centrifugation, it is washed with absolute ethanol and repeated centrifugal washing several times. Placed in a vacuum oven and dried at 60°C for 24 hours, the resulting sample was further heat-treated in an argon-protected tube furnace at 350°C for 2h to obtain a graphene / mesoporous titania nanocomposite photocatalyst.

Embodiment 2

[0027] Add 20 mg of graphene oxide to 80 mL of glacial acetic acid, ultrasonicate for 3 hours to obtain a graphene oxide dispersion, then add 2 mL of n-butyl titanate dropwise to the above graphene oxide dispersion, and place on a magnetic stirrer Continue to stir for 30 minutes, then transfer the above mixed solution to a 100 ml hydrothermal reaction kettle, and react at 200 ° C for 24 hours. After the hydrothermal reaction product is separated by high-speed centrifugation, it is washed with absolute ethanol and repeated centrifugal washing several times. Placed in a vacuum oven and dried at 60°C for 24 hours, the resulting sample was further heat-treated at 400°C for 30 minutes in an argon-protected tube furnace to obtain a graphene / mesoporous titania nanocomposite photocatalyst.

[0028] figure 1 The graphene / mesoporous titania nanocomposite material prepared for this embodiment and the ultraviolet-visible absorption spectrogram of titania, from figure 1 We can see that af...

Embodiment 3

[0036] Add 20 mg of graphene oxide to 80 mL of glacial acetic acid, ultrasonicate for 2 hours to obtain a graphene oxide dispersion, then add 3 mL of n-butyl titanate dropwise to the above graphene oxide dispersion, and place on a magnetic stirrer Continue stirring for 30 minutes. Then the above mixed solution was transferred to a 100 ml hydrothermal reaction kettle, and reacted at 220°C for 18 hours; the product after the hydrothermal reaction was centrifuged at high speed, washed with absolute ethanol and repeated centrifugal washing several times, and then placed in a vacuum oven. After drying at 60°C for 24 hours, the resulting sample was further heat-treated at 500°C for 30 minutes in an argon-protected tube furnace to obtain a graphene / mesoporous titania nanocomposite photocatalyst.

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Abstract

The invention relates to a graphene / mesoporous titanium dioxide visible light catalyst and a preparation method, and belongs to the technical fields of nanometer composite materials and photocatalysis. The method comprises the following steps of: adding a graphene oxide into glacial acetic acid, and performing ultrasonic dispersion to obtain dispersion liquid of the graphene oxide; and adding a titanium source into the dispersion liquid of the graphene oxide, and preparing the graphene / mesoporous titanium dioxide nanometer composite visible light catalyst in a one-step in-situ form by a hydrothermal method. The graphene / mesoporous titanium dioxide visible light catalyst has the advantages of readily available raw materials and low cost, the preparation process is simple and convenient, and titanium dioxide in the obtained nanometer composite material has a nanometer poroid structure, a regular size and a special appearance; and titanium dioxide nanometer granules can be distributed onthe surface of graphene and are high in dispersity. Photocatalytic degradation experiments indicate that the graphene / mesoporous titanium dioxide nanometer composite light catalyst has a good photocatalytic degradation effect on rhodamine B under the irradiation of visible light, and is an ideal nanometer composite visible light catalyst.

Description

technical field [0001] The invention relates to a graphene / mesoporous titanium dioxide nanocomposite visible light catalyst and a preparation method thereof, in particular to a method for preparing a graphene / mesoporous titanium dioxide nanocomposite visible light catalyst by a hydrothermal method, belonging to the technical field of nanocomposite materials and photocatalysis. Background technique [0002] TiO 2 Because of its stable chemical properties, strong resistance to light corrosion, insoluble, non-toxic, and low cost, it is the most widely used photocatalytic material in research. It can make good use of ultraviolet rays below 390 nm in visible light without having to use Short-wavelength ultraviolet light emitted by expensive and harmful artificial light sources (such as high-pressure mercury lamps, etc.); anatase TiO 2 It has the highest activity and is the most effective photocatalyst widely used in the entire field of environmental protection (for example: wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18C02F1/30
CPCY02W10/37
Inventor 杨小飞张蓉仙梁正林李扬张杜唐华
Owner JIANGSU UNIV
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