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Preparation method of carbon quantum dot-carbon nanotube composite material with high adsorption performance

A technology of carbon quantum dots and carbon nanotubes, which is applied in the field of carbon quantum dots-carbon nanotube composite materials, can solve problems such as cumbersome steps, unfavorable environmental protection, and use restrictions, and achieve the avoidance of modification treatment, important environmental protection significance, good The effect of adsorption performance

Active Publication Date: 2021-09-03
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the modified functionalized carbon nanotubes showed better adsorption properties than pristine carbon nanotubes, the cumbersome steps and the use of a large number of strong acids and alkalis limit their large-scale application and are not conducive to environmental protection.

Method used

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  • Preparation method of carbon quantum dot-carbon nanotube composite material with high adsorption performance
  • Preparation method of carbon quantum dot-carbon nanotube composite material with high adsorption performance
  • Preparation method of carbon quantum dot-carbon nanotube composite material with high adsorption performance

Examples

Experimental program
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Effect test

Embodiment 1

[0041] (1) Preparation of the catalyst: Calcinate the washed and dried calcium-based waste such as eggshells at 900°C for 4 hours to obtain the CaO carrier; add the weighed cobalt(II) acetylacetonate and iron(III) acetylacetonate In 100mL of absolute ethanol, stir at 60°C to completely dissolve the metal salt; then add the calcined CaO carrier into the above metal salt solution, stir at room temperature for 30min; then raise the temperature to 60°C and stir until viscous °C oven dried overnight; finally the dried catalyst was ground and calcined at 450 °C for 3 h. The molar ratio of iron to cobalt in the catalyst prepared by the above steps is 1:1, and the total metal content supported by the CaO carrier is 5 wt%.

[0042] (2) Synthesis of carbon quantum dots-carbon nanotubes: take by weighing 150 mg of the catalyst prepared in the above step (1), lay it evenly in the porcelain boat, then put the porcelain boat into the tube furnace; The hydrogen gas is 30 sccm, and the tempe...

Embodiment 2

[0047] (1) Preparation of catalyst: The preparation of catalyst in this embodiment is the same as in Example 1.

[0048] (2) Synthesis of carbon quantum dots-carbon nanotubes: take by weighing 150 mg of the catalyst prepared in the above step (1), lay it evenly in the porcelain boat, then put the porcelain boat into the tube furnace; 30sccm of hydrogen, the temperature is raised to 700°C at a heating rate of 10°C / min, then the hydrogen is adjusted to argon, and the temperature continues to rise in an argon atmosphere; when the temperature rises to 850°C, purge the The ethanol vapor was brought into the reaction zone in the tube furnace and reacted for 30 minutes; after the reaction, the ethanol was stopped and the temperature was lowered to room temperature in an argon atmosphere to obtain a carbon quantum dot-carbon nanotube composite material.

[0049] (3) Purification of carbon quantum dots-carbon nanotubes: the purification of the composite material in this example is the ...

Embodiment 3

[0053] (1) Preparation of catalyst: The preparation of catalyst in this embodiment is the same as in Example 1.

[0054] (2) Synthesis of carbon quantum dots-carbon nanotubes: take by weighing 150 mg of the catalyst prepared in the above step (1), lay it evenly in the porcelain boat, then put the porcelain boat into the tube furnace; It is 30 sccm of hydrogen, and the temperature is raised to 700 °C at a heating rate of 10 °C / min, and then the hydrogen is adjusted to argon, and the temperature is continued in an argon atmosphere; The ethanol vapor was brought into the reaction zone in the tube furnace and reacted for 30 minutes; after the reaction, the ethanol was stopped and the temperature was lowered to room temperature in an argon atmosphere to obtain a carbon quantum dot-carbon nanotube composite material.

[0055] (3) Purification of carbon quantum dots-carbon nanotubes: the purification of the composite material in this example is the same as in Example 1.

[0056] (4)...

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Abstract

The invention relates to a method for preparing a supported catalyst based on calcium-based waste and a method for synthesizing a carbon quantum dot-carbon nanotube composite material with high adsorption performance through the catalyst. The preparation method comprises the following steps: (1) preparing a catalyst: preparing a calcium oxide carrier by using egg shells, duck egg shells, goose egg shells, quail egg shells, pigeon egg shells, ostrich egg shells, lobster shells, abalone shells, crab shells, shells, snail shells and oyster shells, and then preparing the catalyst by using one or more transition metal salts as precursors through an impregnation method; (2) synthesizing a carbon quantum dot-carbon nanotube composite material by using the catalyst prepared in the step (1), taking ethanol as a carbon source and adopting a chemical vapor deposition method; and (3) treating the composite material with dilute acid to obtain the purified composite material. The prepared carbon quantum dot-carbon nanotube composite material has the advantages of unique structure, large specific surface area and the like. Further study on the adsorption performance shows that the maximum adsorption capacity on methylene blue can reach 299.4 mg / g.

Description

technical field [0001] The invention relates to a method for preparing a loaded catalyst based on calcium-based waste, and a method for synthesizing a carbon quantum dot-carbon nanotube composite material with high adsorption performance through the catalyst. Background technique [0002] Carbon nanotubes have been extensively studied since their discovery. The preparation methods of carbon nanotubes mainly include arc discharge method, laser ablation method and chemical vapor deposition method. Compared with the other two methods, chemical vapor deposition has the advantages of relatively mild operating conditions, easy control, and large-scale production, and is the most commonly used method. Chemical vapor deposition often requires carbon sources, catalysts and catalyst supports, especially catalyst supports, as the most abundant components in the catalyst and need to be removed as impurities in subsequent steps. How to reduce the synthesis cost of carbon nanotubes and ...

Claims

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Application Information

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IPC IPC(8): C01B32/162C01B32/17C01B32/15B01J23/78B01J20/20B01J20/30C02F1/28C02F101/36C02F101/38
CPCC01B32/162C01B32/17C01B32/15B01J23/78B01J20/20C02F1/283C02F2101/36C02F2101/38C02F2101/40
Inventor 王宏陈强巴子涵王易赵小强
Owner SOUTHWEST PETROLEUM UNIV
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