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Preparation method of carbon quantum dots

A technology of carbon quantum dots and mass fraction is applied in the field of preparation of carbon quantum dots, which can solve the problems of low utilization rate of urban sludge resources, and achieve the effects of good economic benefits, low production cost and simple method.

Inactive Publication Date: 2019-07-23
LIAONING UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to technical and economic constraints, the resource utilization rate of municipal sludge in my country is very low.

Method used

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  • Preparation method of carbon quantum dots
  • Preparation method of carbon quantum dots
  • Preparation method of carbon quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] a. Select urban sludge with a water content of 83%, carbonize the ground urban sludge at 500°C for 5 hours at high temperature to obtain a black solid, grind the black solid again to make its particle size 200 mesh, and obtain a black solid Powder;

[0029] b. Weigh 0.2 g of the black powder obtained in step a and place it in a flask, then add 40 g of nitric acid with a mass fraction of 65%, and ultrasonicate the mixed solution for 140 min at 30 KHz to obtain solution I, and then The solution I was heated to reflux at 140°C for 15 hours, and cooled to room temperature to obtain solution II;

[0030] c. Filtrate the solution II to obtain a filtrate; centrifuge the filtrate at 8000r / min for 35min, take the supernatant and dialyze for 28h to obtain an aqueous solution of carbon quantum dots.

Embodiment 2

[0032] a. Select municipal sludge with a water content of 80%, and carbonize the ground municipal sludge at 200° C. for 8 hours to obtain a black solid. Grind the black solid again to make its particle size 500 mesh to obtain a black solid. Powder;

[0033] b. Weigh 0.1 g of the black powder obtained in step a and place it in a flask, then add 40 g of nitric acid with a mass fraction of 60%, and ultrasonicate the mixed solution for 260 min at 28 KHz to obtain solution I, and then The solution I was heated to reflux at 140°C for 5 hours, and cooled to room temperature to obtain solution II;

[0034] c. Filtrate the solution II to obtain a filtrate; centrifuge the filtrate at 4000 r / min for 60 min, take the supernatant and dialyze for 8 h to obtain an aqueous solution of carbon quantum dots.

Embodiment 3

[0036] a. Select municipal sludge with a water content of 85%, carbonize the ground municipal sludge at 800°C for 2 hours at high temperature to obtain a black solid, grind the black solid again to make its particle size 50 mesh, and obtain a black solid Powder;

[0037] b. Weigh 0.1 g of the black powder obtained in step a and place it in a flask, then add 10 g of nitric acid with a mass fraction of 68%, ultrasonicate the mixed solution for 20 min at 40 KHz to obtain solution I, and then The solution I was heated to reflux at 60°C for 24 hours, and cooled to room temperature to obtain solution II;

[0038] c. Filtrate the solution II to obtain a filtrate; centrifuge the filtrate at 12000 r / min for 15 minutes, take the supernatant and dialyze for 48 hours to obtain an aqueous solution of carbon quantum dots.

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Abstract

The invention discloses a preparation method of carbon quantum dots. The preparation method comprises steps as follows: a, municipal sludge is carbonized, and black powder is obtained; b, the black powder obtained in step a is uniformly dispersed in nitric acid, a mixed solution is obtained, wherein the mass fraction of nitric acid is 60%-68% and a mass ratio of the black powder to nitric acid is1:(100-400), the mixed solution is subjected to ultrasonic treatment for 20-260 min under 28-40 KHz, a solution I is obtained and then is subjected to heating reflux for 5-24 h at the temperature of 60-140 DEG C and cooled to room temperature, and a solution II is obtained; c, the solution II is filtered, and a filtrate is obtained; the filtrate is centrifuged for 15-60 min at revolving rate of 4,000-12,000 r / min, a supernatant is taken and dialyzed for 8-48 h, and an aqueous carbon quantum dot solution is obtained. The preparation method of the carbon quantum dots has beneficial effects thatthe carbon quantum dots have higher activity, contain functional groups such as carbonyl, hydroxyl, amino and the like and have higher silver light stability and a larger fluorescence range; the production cost is low, and the method is simple and has good economic benefit.

Description

technical field [0001] The invention specifically relates to the field of carbon quantum dots, in particular to a preparation method of carbon quantum dots. Background technique [0002] Municipal sludge is a solid product produced during the treatment of urban domestic sewage and industrial wastewater, and is rich in organic matter. With the acceleration of urbanization and population growth in my country, the discharge of urban sludge has increased significantly. Traditional disposal methods are more harmful to the surrounding environment. From the perspective of economic development, resource utilization, and urban ecological environment protection, resource utilization should be an ideal way out for urban sludge disposal, so urban sludge resource utilization is widely accepted by people. s concern. However, due to technical and economic constraints, the resource utilization rate of municipal sludge in my country is very low. [0003] Carbon quantum dots refer to the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C09K11/65B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B32/05C09K11/65
Inventor 张婷婷张家乐赵霏宋晨朱显会张晓欢
Owner LIAONING UNIVERSITY OF TECHNOLOGY
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