Method for extracting graphene quantum dots from coffee-ground solid waste

A technology of graphene quantum dots and solid waste, applied in chemical instruments and methods, nanotechnology, nano-optics, etc., can solve the problems of cumbersome synthesis steps, use, and difficult preparation of gram quantities, and achieve simple process steps and mild reactions , the effect of high yield

Inactive Publication Date: 2016-05-11
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the synthesis methods of graphene quantum dots have made great progress, from the perspective of large-scale production of graphene quantum dots, there are many problems in these methods, mainly in the low synthesis yield of graphene quantum dots, It is still very difficult to prepare gram quantities on a laboratory scale, and some synthetic steps are too cumbersome, and even use relatively expensive equipment and auxiliary reagents, etc.
If these problems cannot be solved well, the large-scale application of graphene quantum dots will not be realized

Method used

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  • Method for extracting graphene quantum dots from coffee-ground solid waste
  • Method for extracting graphene quantum dots from coffee-ground solid waste
  • Method for extracting graphene quantum dots from coffee-ground solid waste

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Wash the recovered lightly roasted coffee grounds, weigh 1 g and add it to 80 ml of 0.1 mol / L dilute hydrochloric acid, stir and sonicate for 20 h. After the ultrasound stops, filter and wash the coffee grounds repeatedly with deionized water until the pH of the filtrate is about 7. Ultrasonic disperse the washed coffee grounds in 100ml of distilled water, add 10ml of ammonia water and 40ml of hydrazine hydrate mixture (the pH of the solution is not lower than 12) while stirring, and immediately put it into a polytetrafluoroethylene reaction kettle. o C temperature reaction 20h. Take it out after natural cooling, and filter it with a 25nm filter membrane to obtain a dark brown filtrate. The filtered solution is transferred to a dialysis bag for dialysis, and the solution is put into an oven at 120 oC After drying, brown-gray graphene quantum dot powder is finally obtained.

Embodiment 2

[0024] Wash the recovered moderately roasted coffee grounds, weigh 1 g and add it to 80 ml of 0.05 mol / L dilute hydrochloric acid, stir and sonicate for 10 h. After the ultrasound stops, filter and wash the coffee grounds repeatedly with deionized water until the pH of the filtrate is about 7. Ultrasonic disperse the washed coffee grounds in 100ml of distilled water, add 5ml of ammonia water and 20ml of hydrazine hydrate mixture (the pH of the solution is not lower than 12) while stirring, and immediately put it into a polytetrafluoroethylene reaction kettle. o C temperature reaction 10h. Take it out after natural cooling, and filter it with a 25nm filter membrane to obtain a dark brown filtrate. The filtered solution is transferred to a dialysis bag for dialysis, and the solution is put into an oven at 120 oC After drying, brown-gray graphene quantum dot powder is finally obtained.

Embodiment 3

[0026] Wash the recovered deep-roasted coffee grounds, weigh 1 g and add it to 80 ml of 0.1 mol / L dilute hydrochloric acid, stir and sonicate for 2 hours. After the ultrasound stops, filter and wash the coffee grounds repeatedly with deionized water until the pH of the filtrate is about 7. Ultrasonic disperse the washed coffee grounds solid in 100ml of distilled water, add 1ml of ammonia water and 5ml of hydrazine hydrate mixture (the pH of the solution is not lower than 12) while stirring, and immediately put it into a polytetrafluoroethylene reaction kettle, at 120 o C temperature reaction 5h. Take it out after natural cooling, and filter it with a 25nm filter membrane to obtain a dark brown filtrate. The filtered solution is transferred to a dialysis bag for dialysis, and the solution is put into an oven at 120 oC After drying, brown-gray graphene quantum dot powder is finally obtained.

[0027] The sample prepared in the present embodiment is characterized through instr...

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Abstract

The invention relates to a preparation method for extracting a fluorescent graphene quantum dot material from coffee-ground solid waste. According to the preparation method, the coffee-ground solid waste which is low in price and easy to obtain is selected as a carbon source, and a large number of water-soluble graphene quantum dots can be obtained through a simple hydrothermal process. The synthesized quantum dots can be stably dispersed in water, are light yellow under low concentration and are brown under high concentration (that is, the higher the concentration is, the darker the color is). The particle size of the obtained graphene quantum dots ranges from 3 nm to 7 nm, the surfaces of the graphene quantum dots are provided with a large number of carboxyl groups and amino groups, subsequent surface functionalization is facilitated, multi-purpose application can be brought, and meanwhile the excellent fluorescent property is exerted. The synthesized quantum dot material shows the attractive application prospect in the high and new technical fields such as environmental protection, bionanotechnology, new energy resources and nanometer devices, and the synthesizing method is simple, environmentally friendly, rapid, low in energy consumption and suitable for industry expanding.

Description

technical field [0001] The invention belongs to the field of material preparation and relates to a method for extracting graphene quantum dots from coffee grounds solid waste. Background technique [0002] Luminescent nanomaterials have important application value in the fields of tumor visualization therapy, hydrogen production by photolysis of water, and quantum dot-sensitized solar cells. Among them, the fluorescent graphene quantum dot material has attracted much attention as the smallest structure material in the graphene material that has attracted much attention in recent years. For such an ultra-small zero-dimensional system, the massless carriers are strongly quantum-confined in all three dimensions, which will lead to many interesting and tunable new properties, new effects and new applications of graphene materials. [0003] Compared with traditional semiconductor quantum dot fluorescent materials, the new graphene quantum dots have many unique advantages, such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C01B31/04B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/65
Inventor 王亮潘登余李伟涛郭燕婷耿弼江
Owner SHANGHAI UNIV
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