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Preparation method of three-dimensional graphene-titanium dioxide compound photocatalyst

A photocatalyst, titanium dioxide technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of reducing the photocatalytic performance of titanium dioxide, agglomeration and overlapping of graphene nanosheets, low utilization rate, etc. , to achieve good photocatalytic performance, good electrical conductivity and catalytic performance, cost-effective effect

Inactive Publication Date: 2016-07-13
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its inherent defects, its application in reality is limited.
Titanium dioxide is a wide bandgap semiconductor (rutile 3.0ev, anatase 3.2ev), which can only absorb ultraviolet light, and the energy of ultraviolet light only accounts for 4% of sunlight energy, and the utilization rate of titanium dioxide for sunlight is very low; at the same time , ultraviolet light excites the semiconductor to generate photo-generated electron-hole pairs, and the photo-generated electrons and holes interact with the organic pollutants attached to the titanium dioxide to degrade them into water and carbon dioxide, but the recombination rate of the photo-generated electrons and holes is much greater than that with The rate at which organic matter occurs, which greatly reduces the photocatalytic performance of titanium dioxide
Due to the strong covalent bond, hydrophobic interface and van der Waals force between graphene nanosheets, graphene nanosheets will agglomerate and overlap, which will affect its performance.

Method used

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  • Preparation method of three-dimensional graphene-titanium dioxide compound photocatalyst
  • Preparation method of three-dimensional graphene-titanium dioxide compound photocatalyst
  • Preparation method of three-dimensional graphene-titanium dioxide compound photocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0025] In the mixture of 500mg graphite powder and 2.0g sodium nitrate, add 18ml of concentrated sulfuric acid with a mass concentration of 98%, and stir the reaction at a temperature lower than 5°C for 1h; then within 0.5h, slowly add 3.0g potassium permanganate powder, react for 1.5h at a temperature lower than 5°C; raise the temperature of the above reaction system to 35°C, keep it warm for 1h, add 40ml of deionized water to the reactor after the heat preservation, and then raise the temperature to 100°C , kept warm for 15min; then the reaction product was cooled to room temperature, diluted with 70 milliliters of deionized water, and then 10 milliliters of hydrogen peroxide solution with a mass concentration of 35% was added thereto; then the reaction product was filtered, and the obtained filter cake was first Wash three times with 400 ml of hydrochloric acid with a mass concentration of 5%, and then wash three times with deionized water, and finally use a dialysis bag to ...

Embodiment 2

[0031] The graphene oxide prepared in Example 1 was weighed to prepare a graphene oxide aqueous solution, and then a graphene-titanium dioxide composite with a three-dimensional structure was prepared. Weigh 60 mg of the obtained graphene oxide, disperse it in 30 ml of deionized water, ultrasonicate for 2 h, add 60 mg of titanium trichloride, stir well, then pipette 100 microliters of ammonia water with a mass concentration of 28% with a liquid gun, and ultrasonically After treating the reaction mixture, put it into a polytetrafluoroethylene-lined autoclave, and react at 180°C for 12 hours, and freeze-dry the obtained hydrogel product to prepare a three-dimensional graphene-titanium dioxide composite photocatalyst.

Embodiment 3

[0033] The graphene oxide prepared in Example 1 was weighed to prepare a graphene aqueous solution, and then a three-dimensional graphene-titanium dioxide composite was prepared. 120 mg of the obtained graphene oxide was dispersed in 60 ml of deionized water, and after ultrasonic treatment for 2.5 h, 120 mg of titanium trichloride was added, stirred evenly, and then 250 microliters of ammonia water with a mass concentration of 28% was pipetted with a pipette gun, and ultrasonically After treating the reaction mixture, put it into a polytetrafluoroethylene-lined autoclave, and react at 180°C for 12 hours, and freeze-dry the obtained hydrogel product to prepare a three-dimensional graphene-titanium dioxide composite photocatalyst.

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Abstract

The invention relates to a preparation method of a three-dimensional graphene-titanium dioxide compound photocatalyst. A three-dimensional porous-structure graphene-titanium dioxide compound is prepared through a hydrothermal-method reaction of graphene oxide and titanium trichloride. The three-dimensional graphene-titanium dioxide compound provided by the invention has a very good photocatalytic property and can be used for rapidly degrading organic pollutants in wastewater, particularly organic pollutants including pesticides and the like, into pollution-free substances including H2O, CO2 and the like under the conditions of normal temperature, normal pressure and light illumination; and the compound can be repeatedly utilized for a plurality of times and has lasting photocatalytic activity. Furthermore, the three-dimensional graphene-titanium dioxide compound can also be used as a material of a super capacitor, a lithium-ion battery and a fuel cell, and has a wide application prospect.

Description

technical field [0001] The invention relates to a preparation method of a three-dimensional graphene-titanium dioxide composite photocatalyst, specifically belonging to the technical field of photocatalysts. Background technique [0002] In the environment, water pollution is one of the main pollutions in the environment, especially the organic matter pollution in water bodies. Organic pollutants have high toxicity, high environmental release rate, and wide impact. Due to their wide variety and considerable production and use, they have brought great harm to human health and the environment. Organic pollutants have caused soil quality to decline, water quality to be polluted, food pollutant residues to exceed the standard, and have brought great damage to the environment. The main sources of water pollution in my country are industrial wastewater, agricultural wastewater and urban domestic sewage, and the main pollutants in these wastewater are soluble organic pollutants. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18
CPCB01J21/18B01J35/39
Inventor 谢宇宋健华刘玉应方晶凌云
Owner NANCHANG HANGKONG UNIVERSITY
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