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Method for extracting graphene quantum dots and lubricating oil modified additive prepared therefrom

A technology of graphene quantum dots and extraction methods, which is applied in the direction of additives, petroleum industry, lubricating compositions, etc., can solve the problems of high preparation cost, unusable surface functional groups, uneven scale of obtained carbon quantum dots, etc., and achieve the simplification of preparation steps , less environmental pressure, and the effect of cost control

Inactive Publication Date: 2018-08-03
山西中谱能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention overcomes the problems of high preparation cost of existing carbon quantum dots, non-uniform size of obtained carbon quantum dots, and inability to be used under the influence of a single surface functional group, and provides a method for extracting graphene quantum dots

Method used

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  • Method for extracting graphene quantum dots and lubricating oil modified additive prepared therefrom
  • Method for extracting graphene quantum dots and lubricating oil modified additive prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The extraction method of graphene quantum dots is carried out according to the following steps:

[0034] Step 1) Use a mixture of concentrated sulfuric acid and concentrated nitric acid (the molar ratio of concentrated sulfuric acid and concentrated nitric acid is: 8:1) to jointly treat the selected coal-based materials containing nitrogen and sulfur. Mixture 80ml;

[0035] Step 2) heating the liquid-solid mixture in step 1) to 130 degrees Celsius for 20 hours under stirring, and performing ultrasonic treatment at the same time, and the heating process is carried out in an oil bath;

[0036] Step 3) After the reaction mixture in step 2) is naturally lowered to room temperature, the initial graphene product is obtained after neutralization reaction and 8 times of washing. The neutralization reaction uses 4 moles of sodium hydroxide per liter to the mixture The pH value is 7, and the neutralization process is carried out in a water bath to take away the heat generated to e...

Embodiment 2

[0040] Step 1) Use a mixture of concentrated sulfuric acid and concentrated nitric acid (the molar ratio of concentrated sulfuric acid and concentrated nitric acid is: 6:1) to jointly treat the selected coal-based materials containing nitrogen and sulfur. Mixture 40ml;

[0041] Step 2) heating the liquid-solid mixture in step 1) to 90 degrees Celsius for 15 hours under stirring, and performing ultrasonic treatment at the same time, and the heating process is carried out in an oil bath;

[0042] Step 3) After the reaction mixture in step 2) is naturally lowered to room temperature, the initial graphene product is obtained after neutralization reaction and 8 times of washing. The neutralization reaction uses 3 moles of sodium hydroxide per liter to the mixture The pH value is 7, and the neutralization process is carried out in an ice bath to take away the heat generated to ensure that the reaction is carried out under mild conditions, while ensuring the safety of the process, an...

Embodiment 3

[0046] Step 1) Use a mixture of concentrated sulfuric acid and concentrated nitric acid (the molar ratio of concentrated sulfuric acid and concentrated nitric acid is: 3:1) to jointly treat the selected coal-based materials containing nitrogen and sulfur. Mixture 25ml;

[0047] Step 2) heating the liquid-solid mixture in step 1) to 120 degrees Celsius for 8 hours under stirring, and performing ultrasonic treatment at the same time, and the heating process is carried out in a high-pressure water bath;

[0048] Step 3) After the reaction mixture in step 2) is naturally lowered to room temperature, the initial graphene product is obtained after neutralization reaction and 6 times of washing. The neutralization reaction uses 1.5 moles of sodium hydroxide per liter to the mixture The pH value is 7, and the neutralization process is carried out in an ice bath to take away the heat generated to ensure that the reaction is carried out under mild conditions, while ensuring the safety o...

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Abstract

The invention particularly discloses a method for extracting graphene quantum dots and a lubricating oil modified additive prepared therefrom. In the invention, raw coal which comprises high-moisturelow-rank coal, aged anthracite and transitional bituminous coal therebetween or can also be coal-related coke such as gas coke, activated carbon or other coal-based raw materials are utilized, on thebasis of the improved conventional graphene synthesis Hummer method, an obtained graphene preliminary product is subjected to secondary dialysis in a dialysis bag, materials in the second dialysis bagare taken as the raw materials of carbon quantum dots of the invention, the scale of acquiring the graphene can be well controlled, the scale of the carbon quantum dots is uniform, and the obtained graphene quantum dots has a thickness of 1 to 100 carbon layers and a scale of 1 to 10nm. Furthermore, functional groups on the surface of the prepared carbon quantum dots are enriched by the sulfur and nitrogen contents in the raw materials, and the rich oxygen, sulfur and nitrogen functional groups are attached to each quantum dot, thereby facilitating a further link to other molecules to play the ability of versatility.

Description

technical field [0001] The invention belongs to the field of extraction of carbon quantum dots, in particular to a method for extracting graphene quantum dots. The obtained carbon quantum dots can be widely used in fluorescent display, basic materials for carrying active substances, lubricating oil additives, anti-corrosion, anti-wear, shielding and other protective functions of the display layer. Background technique [0002] Graphene usually refers to a single-layer, sheet-like graphitic carbon material. Now only with the help of plasma on a specific metal surface can a strictly high-quality graphene material be formed, and the scale of synthetic graphene is very small (generally in the range of microns to Millimeter level), surface impurities (unavoidable, to a certain extent pollution during the preparation process). Since the discovery of graphene, its excellent material chemical properties have greatly expanded its application fields in a short period of time, such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00C10M125/02C10N30/06C10N30/08
CPCB82Y20/00B82Y40/00C09K11/65C10M125/02C10M2201/041C10M2207/289C10N2030/06C10N2030/08C10N2030/56
Inventor 曹晏
Owner 山西中谱能源科技有限公司
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