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Nano graphene as well as preparation method and application thereof, and method for preparing solar heat collection pipe

A solar collector tube, nano-graphene technology, applied in the directions of graphene, nano-carbon, chemical instruments and methods, etc., to achieve the effect of improving light absorption and improving heat collection efficiency

Inactive Publication Date: 2019-01-04
张俊霞
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few public reports on the effect of nanomaterial absorbance on the photothermal conversion of solar collector tubes

Method used

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  • Nano graphene as well as preparation method and application thereof, and method for preparing solar heat collection pipe
  • Nano graphene as well as preparation method and application thereof, and method for preparing solar heat collection pipe
  • Nano graphene as well as preparation method and application thereof, and method for preparing solar heat collection pipe

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The preparation method of nano-graphene of the present invention comprises the following steps:

[0039] (1) Measure 82.8 mL of sulfuric acid, 9.2 mL of phosphoric acid, 40 mL of hydrogen peroxide, 4 g of graphite powder and 12 g of potassium permanganate;

[0040] (2) Put the dried 250mL beaker in an ice-water bath and put it into a magnetic stirrer, add the weighed sulfuric acid and phosphoric acid into the beaker by means of glass rod drainage, control the temperature of the system at 1 °C, and let It is stirred and mixed evenly;

[0041] (3) slowly add 4g graphite powder to the beaker and continue stirring for 1h;

[0042] (4) Controlling the temperature at 2°C, slowly adding potassium permanganate in portions to the beaker for 2h, and stirring continuously for 2h; then transfer the system to a 35°C water bath, and continue stirring for 30min;

[0043] (5) Slowly drop deionized water into the beaker, slowly raise the temperature of the system to 85°C, and continue...

Embodiment 2

[0052] The preparation method of nano-graphene of the present invention comprises the following steps:

[0053](1) Measure 31.5 mL of sulfuric acid, 3.5 mL of phosphoric acid, 10 mL of hydrogen peroxide, 1.5 g of graphite powder and 4.5 g of potassium permanganate;

[0054] (2) place the dried beaker in an ice-water bath, now add sulfuric acid to the beaker by means of glass rod drainage, then add phosphoric acid to the beaker by means of glass rod drainage, and control the temperature of the system at 2°C;

[0055] (3) continue to add 1.5g graphite powder to the beaker, continue to stir, and react for 1h;

[0056] (4) Slowly add 4.5g potassium permanganate to the beaker in stages, add potassium permanganate for 1 hour, maintain the temperature of the system at 5 °C, and react for 2 hours, then transfer the system to a water bath at 38 °C and continue to stir Reaction 30min; wherein, when potassium permanganate is added, it must be slow to prevent sulfuric acid from splashing...

Embodiment 3

[0066] The preparation method of nano-graphene of the present invention comprises the following steps:

[0067] (1) Measure 54.9 mL of sulfuric acid, 6.1 mL of phosphoric acid, 20 mL of hydrogen peroxide, 2.8 g of graphite powder and 8.4 g of potassium permanganate;

[0068] (2) place the dried beaker in an ice-water bath, now add sulfuric acid to the beaker by means of glass rod drainage, then add phosphoric acid to the beaker by means of glass rod drainage, and control the temperature of the system at 4°C;

[0069] (3) continue to add 2.8g graphite powder to the beaker, continue to stir, and react for 2h;

[0070] (4) Slowly add 8.4g of potassium permanganate to the beaker, the time for adding potassium permanganate is 2h, maintain the temperature of the system at 7°C, stir while adding, and then transfer the system to a water bath at 40°C Continue to stir the reaction for 1h; among them, the potassium permanganate must be added slowly to prevent the sulfuric acid from spla...

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Abstract

The invention discloses nano graphene as well as a preparation method and application thereof, and a method for preparing a solar heat collection pipe. The preparation method of the graphene comprisesthe following steps: oxidizing graphite by adopting strong acid, potassium permanganate and hydrogen peroxide to prepare graphite oxide, ultrasonically treating the graphite oxide to prepare grapheneoxide, and finally reducing the graphene oxide through trisodium citrate to obtain the graphene. The surface of the graphene is flat; a sheet layer has a small number of folds; furthermore, the sheetlayer is extremely high in transparency; adsorption experimental analysis for the graphene and methylene blue shows that the graphene prepared according to the preparation method disclosed by the invention is relatively high in light absorption property, and the graphene can be used as a light absorbent applied to the solar heat collection pipe.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of nano-graphene, in particular to a nano-graphene and a preparation method, application and preparation method of a solar collector tube. Background technique [0002] Solar spectrum selective absorption coating is one of the core material technologies in the field of solar thermal utilization. First, the excellent photothermal conversion performance of nanomaterials can effectively improve the solar photothermal conversion efficiency. Adding copper sulfide to silica can significantly improve the photothermal conversion performance of the composite phase change material. Adding solid particles of different types and mass fractions to the heat transfer oil helps to improve its light-to-heat conversion properties, and graphite-oil and copper foil-oil show good light-to-heat conversion properties. The photothermal conversion ability of lead sulfide / attapulgite composite is stro...

Claims

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Application Information

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IPC IPC(8): C01B32/184F24S70/20
CPCC01B2204/24C01B32/184
Inventor 王泽华张俊霞
Owner 张俊霞
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