Preparation method of TiO2/graphene composite film

A composite film and graphene technology, applied in the field of nanomaterials and photocatalysis

Inactive Publication Date: 2012-03-21
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with chemical preparation methods, these film-making technologies have more complex process requirements, especially it is difficult to realize the composite of TiO and carbon materials.
Therefore, so far, there is no report on the method of preparing TiO2 / graphene composite film

Method used

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  • Preparation method of TiO2/graphene composite film
  • Preparation method of TiO2/graphene composite film
  • Preparation method of TiO2/graphene composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 0.3 g graphite powder, 0.5 g K 2 S 2 o 4 and 0.5 g P 2 o 5 Mix and add to 2 ~ 4 ml of concentrated H with a mass fraction of 98% 2 SO 4 , stirred at constant temperature at 80°C for 4 hours to obtain a dark blue solution. After filtration, the initial product was added to 12 ml of concentrated H with a mass fraction of 98%. 2 SO 4 , slowly add 1.5 g KMnO 4 , so that the temperature of the mixed solution does not exceed 20 °C, and then stirred at a constant temperature of 35 °C for 2 hours, the solution turned yellowish brown. After adding 25 ml of distilled water, continue stirring, and after 2 hours, add 70 ml of distilled water and 2 ml of 30% H 2 o 2 , reducing the incompletely reacted KMnO 4 , the solution turned bright yellow. Filtration, pickling, water washing, and drying are performed in sequence to obtain graphene oxide.

[0033] Configure graphene oxide and TiO separately 2 The ethanol suspension of nanoparticles has a mass concentration of 0.1 m...

Embodiment 2

[0035] Example 2 : mix 0.3 g graphite powder, 0.5 g K 2 S 2 o 4 and 0.5 g P 2 o 5 Mix and add to 2 ~ 4 ml concentrated H with a mass fraction of 98% 2 SO 4 , stirred at constant temperature at 80°C for 4 hours to obtain a dark blue solution. After filtration, the initial product was added to 12 ml of concentrated H with a mass fraction of 98%. 2 SO 4 , slowly add 1.5 g KMnO 4 , so that the temperature of the mixed solution does not exceed 20 °C, and then stirred at a constant temperature of 35 °C for 2 hours, the solution turned yellowish brown. After adding 25 ml of distilled water, continue stirring, and after 2 hours, add 70 ml of distilled water and 2 ml of 30% H 2 o 2 , reducing the incompletely reacted KMnO 4 , the solution turned bright yellow. Filtration, pickling, water washing, and drying are performed in sequence to obtain graphene oxide.

[0036] Configure graphene oxide and TiO separately 2 The acetone suspension of nanoparticles has a mass concent...

Embodiment 3

[0038] Example 3 : mix 0.3 g graphite powder, 0.5 g K 2 S 2 o 4 and 0.5 g P 2 o 5 Mix and add to 2 ~ 4 ml concentrated H with a mass fraction of 98% 2 SO 4 , stirred at constant temperature at 80°C for 4 hours to obtain a dark blue solution. After filtration, the initial product was added to 12 ml of concentrated H with a mass fraction of 98%. 2 SO 4 , slowly add 1.5 g KMnO 4 , so that the temperature of the mixed solution does not exceed 20 °C, and then stirred at a constant temperature of 35 °C for 2 hours, the solution turned yellowish brown. After adding 25 ml of distilled water, continue stirring, and after 2 hours, add 70 ml of distilled water and 2 ml of 30% H 2 o 2 , reducing the incompletely reacted KMnO 4 , the solution turned bright yellow. Filtration, pickling, water washing, and drying are performed in sequence to obtain graphene oxide.

[0039] Configure graphene oxide and TiO separately 2 The ethanol suspension of nanoparticles has a mass concent...

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Abstract

The invention provides a preparation method of a layered TiO2 / graphene composite film. The preparation method comprises the following steps: 1, a graphene oxide is prepared with a chemical peeling method (also known as a graphite reduction oxidation method); 2, the large area uniform graphene oxide and a TiO2 nanofilm are sequentially prepared with a rotary coating technology; and 3, the prepared layered composite film is irradiated by placing it under an ultraviolet lamp, and the graphene oxide is reduced into graphene by photoproduced electrons produced by TiO2 in the irradiation process to form the TiO2 / graphene composite film. The preparation method of the invention can be applied to the photocatalytic purification field. Compared with the TiO2 nanofilm, the layered composite film has an obviously improved absorption efficiency to visible light, and has a substantially improved degradation efficiency on organic pollutants.

Description

technical field [0001] The present invention relates to a kind of titanium dioxide (TiO 2 ) / graphene composite film, belonging to the field of nanomaterials and photocatalysis. Background technique [0002] As one of the most widely used photocatalyst materials, TiO 2 It plays an important role in environmental pollution control and solar energy utilization. Currently, in TiO 2 There have been great breakthroughs in the preparation and other aspects, but due to its forbidden band width of 3.2 (Anatase, Anatase), can only absorb ultraviolet light with a wavelength less than 387nm, and the photocatalytic efficiency is very low. Therefore, many scientists focus their research on TiO 2 Visible light modification and improvement of catalytic efficiency. At present, the methods used for visible light modification mainly include doping and compounding. Among them, carbon nanomaterials, due to their unique physical and chemical properties, make them and TiO 2 Research on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18B01J21/06B01J35/02
Inventor 潘春旭张豫鹏许俊杰
Owner WUHAN UNIV
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