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Preparation method for modified graphene-loaded titanium dioxide composite photocatalyst

A technology of titanium dioxide and graphene, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as easy agglomeration, difficult dispersion, weak interaction, etc., to achieve difficult agglomeration, low cost, Meet the effect of industrial production

Inactive Publication Date: 2015-07-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the weak polarity of carbon atoms in the graphene layer makes the interaction with other media weaker, and the van der Waals force between the carbon layers leads to easy agglomeration, making it difficult to disperse in common solvents such as water.

Method used

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  • Preparation method for modified graphene-loaded titanium dioxide composite photocatalyst
  • Preparation method for modified graphene-loaded titanium dioxide composite photocatalyst
  • Preparation method for modified graphene-loaded titanium dioxide composite photocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0033] 6 mL of triethanolamine was added to 400 mL of graphene oxide suspension with a concentration of 5.5 mg / mL, and the reaction was stirred at 80° C. for 2 h. Centrifuge and wash until the eluent is neutral to obtain a graphene oxide suspension modified with triethanolamine. Dissolving 10g of titanyl sulfate in 500mL of sulfuric acid solution with a concentration of 0.3mol / L to obtain a titanyl cation solution, adding 240mL of triethanolamine-modified graphene oxide suspension to the above-mentioned titanyl cation solution, Ultrasonic assisted impregnation for 2 h and centrifugation to obtain a solid catalyst precursor. With 70mL of Na with a concentration of 0.1mol / L 2 CO 3 Solution After dispersing the catalyst precursor, it was transferred to a polytetrafluoroethylene-lined hydrothermal kettle, and placed in an oven at 80°C for hydrothermal reaction for 20 hours. The reaction mixture was centrifugally washed to neutrality, and the obtained solid was dried at 80°C and...

Embodiment 2

[0035]5 mL of triethanolamine was added to 400 mL of graphene oxide suspension with a concentration of 5.5 mg / mL, and the reaction was stirred at 120° C. for 2 h. Centrifuge and wash until the eluent is neutral to obtain a graphene oxide suspension modified with triethanolamine. Dissolving 10g of titanyl sulfate in 500mL of sulfuric acid solution with a concentration of 0.5mol / L to obtain a titanyl cation solution, adding 240mL of triethanolamine-modified graphene oxide suspension to the above-mentioned titanyl cation solution, Ultrasonic assisted impregnation for 3 h and centrifugation to obtain a solid catalyst precursor. With 70mL concentration of 0.3mol / L Na 2 CO 3 Solution The catalyst precursor was dispersed and transferred to a polytetrafluoroethylene-lined hydrothermal kettle, and placed in a 70°C oven for hydrothermal reaction for 25 hours. The reaction mixture was centrifugally washed to neutrality, and the obtained solid was dried at 80°C and transferred to a muf...

Embodiment 3

[0037] 3 mL of triethanolamine was added to 400 mL of graphene oxide suspension with a concentration of 5.5 mg / mL, and the reaction was stirred at 60° C. for 3 h. Centrifuge and wash until the eluent is neutral to obtain a graphene oxide suspension modified with triethanolamine. Dissolving 10g of titanyl sulfate in 500mL of sulfuric acid solution with a concentration of 0.1mol / L to obtain a titanyl cation solution, adding 240mL of triethanolamine-modified graphene oxide suspension to the above-mentioned titanyl cation solution, Ultrasonic assisted impregnation for 1 h and centrifugation to obtain a solid catalyst precursor. With 70mL concentration of 0.5mol / L Na 2 CO 3 Solution After dispersing the catalyst precursor, it was transferred to a polytetrafluoroethylene-lined hydrothermal kettle, and placed in a 100°C oven for hydrothermal reaction for 15 hours. The reaction mixture was centrifugally washed to neutrality, and the obtained solid was dried at 80°C and transferred ...

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Abstract

The invention discloses a preparation method for a modified graphene-loaded titanium dioxide composite photocatalyst. The method comprises the following steps: obtaining a graphene oxide suspension through an improved Hummers method, and adding triethanolamine into the graphene oxide suspension for reacting to obtain a modified graphene oxide suspension liquid; dropwise adding the obtained modified graphene oxide suspension liquid into a sulfuric acid solution in which titanyl sulfate is dissolved; performing ultrasonic auxiliary soaking, and then performing centrifugal separation to obtain a composite photocatalyst precursor; adding the composite photocatalyst precursor into an alkali solution to perform hydrothermal reaction; pre-drying a hydrothermal reaction product, and performing high-temperature calcining and reducing in an air atmosphere to obtain the modified graphene-loaded titanium dioxide composite photocatalyst which is stable in structure, high in specific surface area, high in photocatalytic activity, small in titanium dioxide particle size (about 10 nm), uniform in distribution, and difficult to agglomerate. The method is easy to operate and low in cost, and meets industrial production.

Description

technical field [0001] The invention relates to a preparation method of a modified graphene-loaded titanium dioxide composite photocatalyst, which belongs to the technical field of photocatalysts. Background technique [0002] Titanium dioxide semiconductor has the advantages of strong oxidation ability, complete degradation and reusability, and has great application value in the field of photocatalysis. How to prepare a high-performance titanium dioxide catalyst with small particle size and good dispersion through a simple process is one of the hot issues in the field of photocatalytic research. As a new type of two-dimensional carbon material, graphene has excellent electrical, thermal and mechanical properties, and has been widely studied in the fields of electronics, sensing, catalysis, and biomedicine. It is currently a hot research direction to use graphene sheet as a carrier to support titanium dioxide, because graphene has an ultra-high theoretical specific surface ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18
Inventor 刘辉王瑞萌韩凯刘贡钢崔欢庆
Owner CENT SOUTH UNIV
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