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Preparation method for titanium dioxide/graphene aerogel with high specific surface area

A graphene aerogel, high specific surface area technology, applied in chemical instruments and methods, chemical/physical processes, catalyst carriers, etc., can solve the problems of low photocatalytic efficiency and no visible light response, and achieve large specific surface area, electrical conductivity The effect of high rate and high specific surface area

Inactive Publication Date: 2016-08-17
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although titanium dioxide meets the basic requirements as an excellent photocatalytic material, its wide application is still limited by the two bottlenecks of low photocatalytic efficiency and no visible light response of the material itself.

Method used

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  • Preparation method for titanium dioxide/graphene aerogel with high specific surface area
  • Preparation method for titanium dioxide/graphene aerogel with high specific surface area
  • Preparation method for titanium dioxide/graphene aerogel with high specific surface area

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Take 32mg of graphene oxide powder, add 16mL of deionized water, ultrasonically disperse for 2 hours, then mechanically stir until a well-dispersed and stable graphene oxide aqueous solution is formed; add 10.67mg of titanium dioxide powder to the prepared graphene oxide aqueous solution, Stir mechanically for 1 hour to form a well-dispersed titanium dioxide / graphene oxide mixed solution; add 50 mg of ascorbic acid to the above mixed solution, stir evenly, transfer to a hydrothermal reaction kettle, and react at a constant temperature of 90°C for 6 hours to prepare a three-dimensional titanium dioxide / graphene hydrogel; freeze-drying at -60~-50°C for 24 hours to obtain titanium dioxide / graphene airgel with high specific surface area.

Embodiment 2

[0036] Take 32 mg of graphene oxide powder, add 16 mL of deionized water, ultrasonically disperse for 2 hours, and then mechanically stir until a well-dispersed and stable graphene oxide aqueous solution is formed; add 32 mg of titanium dioxide powder to the prepared graphene oxide aqueous solution, and mechanically Stir for 1 hour to form a well-dispersed titanium dioxide / graphene oxide mixed solution; add 50 mg of ascorbic acid to the above mixed solution, stir evenly, transfer to a hydrothermal reaction kettle, and react at a constant temperature of 90°C for 6 hours to prepare a three-dimensional titanium dioxide / graphene oxide Graphene hydrogel; freeze-dry at -60~-50°C for 24 hours to obtain titanium dioxide / graphene airgel with high specific surface area.

Embodiment 3

[0038] Take 32 mg of graphene oxide powder, add 16 mL of deionized water, ultrasonically disperse for 2 hours, and stir mechanically until a well-dispersed and stable graphene oxide aqueous solution is formed; add 96 mg of titanium dioxide powder to the prepared graphene oxide aqueous solution, and mechanically Stir for 1 hour to form a well-dispersed titanium dioxide / graphene oxide mixed solution; add 50 mg of ascorbic acid to the above mixed solution, stir evenly, transfer to a hydrothermal reaction kettle, and react at a constant temperature of 90°C for 6 hours to prepare a three-dimensional titanium dioxide / graphene oxide Graphene hydrogel; freeze-dry at -60~-50°C for 24 hours to obtain titanium dioxide / graphene airgel with high specific surface area.

[0039] The titanium dioxide / graphene airgel obtained in the above examples has been observed by a scanning electron microscope (SEM), figure 2 , Figure 4 and Image 6 The SEM spectra of titanium dioxide / graphene aerogel...

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Abstract

The invention relates to a preparation method for titanium dioxide / graphene aerogel with a high specific surface area, belonging to the technical field of energy and catalysis. The preparation method comprises the following steps: mixing graphene oxide powder with deionized water and carrying out ultrasonic dispersion and mechanical stirring so as to obtain a stable aqueous graphene oxide solution with good dispersibility; adding titanium dioxide powder into the aqueous graphene oxide solution, adding a reducing agent at the same time and carrying out ultrasonic dispersion and mechanical stirring until a stable titanium dioxide / graphene mixed solution is formed; and putting the prepared mixed solution into a baking oven, preparing three-dimensional titanium dioxide / graphene hydrogel by using a constant-temperature hydrothermal method and subjecting the titanium dioxide / graphene hydrogel to freeze drying to remove a solvent so as to obtain the titanium dioxide / graphene aerogel with a high specific surface area. The method provided by the invention is simple in process, good in operability, low in energy consumption, free of pollution and high in the specific surface area and has great application prospects in the fields of energy and catalysis.

Description

technical field [0001] The invention relates to a preparation method of titanium dioxide / graphene airgel with high specific surface area, belonging to the technical field of energy and catalysis. Background technique [0002] At present, environmental pollution and energy crisis are major problems plaguing countries all over the world. Photocatalytic materials have two major functions of photo-splitting water to produce hydrogen and photodegrading pollutants. Using photocatalytic materials can not only convert low-density solar energy into storable high-density hydrogen energy, but also make full use of solar energy to degrade and mineralize the environment. Therefore, it has an important application prospect in solving energy and environmental problems. [0003] Titanium dioxide is the most widely studied and the most concerned among many photocatalytic materials, and is considered to be one of the most promising photocatalytic materials. Although titanium dioxide meets t...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J35/02B01J35/10B01J32/00C02F1/30C02F101/38
CPCC02F1/30B01J21/18C02F2101/40C02F2305/10B01J35/31B01J35/23B01J35/615B01J35/39
Inventor 郑思辉杨娟程晓农高帅杜文修曾炜炜
Owner JIANGSU UNIV
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