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Preparation method of iodine-doped titanium dioxide-graphene composite photocatalyst

A technology of graphene composite and titanium dioxide, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of insufficient stability of catalytic activity and insufficient catalytic activity, so as to improve photocatalysis Activity, expanding the spectral response range, promoting the effect of separation

Inactive Publication Date: 2014-03-19
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although this composite material extends the spectral response range of titanium dioxide to the visible light region, the catalytic activity is still not high enough, and the stability of the catalytic activity is not good enough.

Method used

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  • Preparation method of iodine-doped titanium dioxide-graphene composite photocatalyst
  • Preparation method of iodine-doped titanium dioxide-graphene composite photocatalyst
  • Preparation method of iodine-doped titanium dioxide-graphene composite photocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Preparation of Graphene Oxide

[0021] Assemble a 250mL reaction flask in an ice-water bath, add 60mL concentrated H 2 SO 4 , add 2g graphite powder and 1gNaNO under stirring 3 The solid mixture, then add 6gKMnO 4 , control the reaction temperature not to exceed 20°C, stir and react for a period of time, then raise the temperature to about 35°C, continue stirring for 30 minutes, then slowly add a certain amount of deionized water, continue stirring for 20 minutes, and add an appropriate amount of hydrogen peroxide to reduce the residual oxidant to make the solution Turn golden yellow, filter while hot, and wash with 5% HCl solution and deionized water for 3 to 5 times, then place the filtrate in a vacuum oven at 60°C to fully dry, and store for future use.

Embodiment 2

[0023] Preparation of Titanium Dioxide Photocatalyst

[0024] Take 2mlTiCl 4 Add dropwise to 310ml of aqueous solution, stir at room temperature for hydrolysis to obtain a white sol, transfer it to a high-pressure reactor with polytetrafluoroethylene, and conduct a hydrothermal reaction at 100°C for 24 hours. After naturally cooling to room temperature, take out the reactant , centrifuged, washed, and vacuum-dried at 60°C to obtain a white powder.

Embodiment 3

[0026] Preparation of Titanium Dioxide-Graphene Composite Photocatalyst

[0027] Weigh 0.15g of the prepared graphene oxide and ultrasonically disperse it in 310ml of distilled water for 15min, centrifuge at 6000rpm for 5min, transfer to the refrigerator (5°C) for 1h to obtain an ice-brown solution, then take 2ml of TiCl 4 Add dropwise to the ice solution and stir at room temperature for hydrolysis to obtain a light yellow sol, transfer it to a high-pressure reactor with polytetrafluoroethylene, and conduct a hydrothermal reaction at 100°C for 24 hours. After naturally cooling to room temperature, take out the reactant , centrifuged, washed, and vacuum-dried at 60°C to obtain a gray powder, whose scanning electron microscope picture is figure 1 on the left.

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Abstract

The invention discloses a preparation method of an iodine-doped titanium dioxide-graphene composite photocatalyst. According to the method, TiCl4 is mixed with a GO aqueous solution; TiO2 / G is prepared by hydrothermal reduction; then heat treatment with 55% HI is performed to doping iodine into TiO2 / G; and thus the composite photocatalyst I / TiO2 / G with high catalytic activity at visible light is prepared. According to the method of the invention, an impurity element of iodine is introduced; new charges are introduced into crystal lattices to form a new doping energy level; thus photons with low energy can be excited to the doping energy level to capture photoproduced electrons or cavities; the separation of the electrons and the cavities is promoted; and finally the photocatalytic activity is improved. The material obtained in the invention not only greatly improves the photocatalytic activity of TiO2 / G at visible light, expands the spectral response range of TiO2 / G in the visible light region, but also further improves the photocatalytic activity of TiO2 / G at ultraviolet light.

Description

technical field [0001] The invention belongs to the field of preparation of nanocomposite photocatalytic materials, and relates to a preparation method of iodine-doped titanium dioxide-graphene composite photocatalyst. Background technique [0002] Photocatalytic technology is expected to develop into a new green pollution control technology that directly utilizes solar energy and oxygen or water in the air to degrade pollutants. TiO 2 As a commonly used photocatalyst, it has good chemical stability and high photocatalytic activity, and at the same time has the advantages of cheap and easy to obtain, photochemical corrosion resistance, and strong oxidation resistance, so it is favored. However, due to TiO 2 The energy band gap is wide, and the solar energy that can be used is only the ultraviolet part that accounts for 3% of the total energy. Therefore, in order to improve the utilization rate of solar energy, TiO 2 The spectral response range of TiO has been extended to...

Claims

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Application Information

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IPC IPC(8): B01J27/135
Inventor 丁旵明刘娟李岩
Owner EAST CHINA NORMAL UNIV
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