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Method for extracting fluorescent carbon quantum dots from semi coke

A technology of carbon quantum dots and blue carbon, which is applied in the field of extracting fluorescent carbon quantum dots, can solve the problems of complex processing procedures, expensive reagents, and difficult separation, and achieve the effects of high chemical activity, easy purification, and uniform particle size

Inactive Publication Date: 2016-06-01
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have more or less their shortcomings, such as complex procedures, expensive reagents, low yield, and difficult separation in the synthesis process, so the preparation method of carbon quantum dots needs to be further developed. Improve and optimize

Method used

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  • Method for extracting fluorescent carbon quantum dots from semi coke
  • Method for extracting fluorescent carbon quantum dots from semi coke
  • Method for extracting fluorescent carbon quantum dots from semi coke

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Add 0.1g of dried semi-coke powder to 100ml of 4M nitric acid and reflux at 100°C for 12h. After cooling down to room temperature naturally, centrifuge at a speed of 10,000r / min for 30min. Collect the supernatant to remove the precipitate and distill it under reduced pressure. The resulting supernatant was evaporated to dryness, and the black solid (about 1.105 g) obtained by evaporation was dispersed in water, neutralized to neutrality with a concentrated ammonia solution with a mass fraction of 37% to obtain a suspension, and then 10000r / min Centrifuge at a rotational speed for 30 min, collect the supernatant, dialyze the supernatant with a dialysis bag with a molecular weight cut-off of 0.5 kDa, collect the solution in the dialysis bag, and dry in vacuum at 60°C for 48 hours to obtain carbon quantum dots.

Embodiment 2

[0029] Add 5g of dry blue charcoal powder into 100ml of 6M nitric acid and reflux at 120°C for 36h. After naturally cooling to room temperature, centrifuge at a speed of 15000r / min for 60min. Collect the supernatant to remove the precipitate, and distill it under reduced pressure. The resulting supernatant was evaporated to dryness, and the black solid (about 1.105 g) obtained by evaporation was dispersed in water, neutralized to neutrality with a concentrated ammonia solution with a mass fraction of 37% to obtain a suspension, and then the speed of 15000r / min Centrifuge for 60 minutes, collect the supernatant, dialyze the supernatant with a dialysis bag with a molecular weight cut-off of 1 kDa, collect the solution in the dialysis bag, and dry it in vacuum at 80° C. for 24 hours to obtain carbon quantum dots.

Embodiment 3

[0031] Add 0.2g dry blue carbon powder to 100ml of 6M nitric acid and reflux at 100°C for 24h. After cooling down to room temperature naturally, centrifuge at 10,000r / min for 40min. Collect the supernatant to remove the precipitate and distill under reduced pressure The resulting supernatant was evaporated to dryness, and the black solid (about 1.105 g) obtained by evaporation was dispersed in water, neutralized to neutrality with a concentrated ammonia solution with a mass fraction of 37% to obtain a suspension, and then 10000r / min Centrifuge at a rotational speed for 40 min, collect the supernatant, dialyze the supernatant with a dialysis bag with a molecular weight cut-off of 3 kDa, collect the solution in the dialysis bag, and dry in vacuum at 60° C. for 36 hours to obtain carbon quantum dots.

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Abstract

The invention provides a method for extracting fluorescent carbon quantum dots from semi coke. The method comprises the following steps: firstly, adding semi coke powder into a 4M to 6M nitric acid solution, and carrying out stirred refluxing at the temperature of 80 DEG C to 120 DEG C; carrying out natural cooling, then, carrying out centrifugation for 30 minutes to 60 minutes at the rate of 10,000r / min to 15,000r / min, collecting supernatant, removing precipitates, and drying the obtained supernatant by distillation in a reduced-pressure distillation manner, so as to obtain black solids; dispersing the black solids in deionized water, carrying out neutralizing by ammonia water, then, carrying out centrifugation for 30 minutes to 60 minutes at the rate of 10,000r / min, and collecting supernatant; dialyzing the supernatant by dialysis bags, collecting solutions in the dialysis bags, and carrying out vacuum drying for 24 hours to 48 hours at the temperature of 60 DEG C to 80 DEG C, thereby obtaining the carbon quantum dots. According to the method, the semi coke which is low in cost and easy in raw material obtaining is adopted as a carbon source, and the carbon quantum dots can be obtained through simple chemical oxidation, evaporation, neutralization, centrifugation and dialysis treatment processes. The carbon quantum dots have the particle size of 3nm to 5nm and are uniform in dispersion, and surfaces of the carbon quantum dots have a large number of carboxyl groups and hydroxyl groups, so that a relatively good fluorescent property is shown.

Description

technical field [0001] The invention relates to a method for extracting fluorescent carbon quantum dots from blue charcoal. Background technique [0002] In recent years, due to their excellent fluorescence properties, quantum dots have important application potential in the fields of ion detection, biomarkers, and biomedicine. Although common semiconductor quantum dots such as CdSe, CdS, and Si have the advantages of controllable size, narrow emission wavelength range, and high luminescence quantum yield, due to their poor water solubility, poor chemical stability, and most of them have low Defects such as strong toxicity limit its practical application, especially in the fields of ion detection and biomedicine. Compared with the above-mentioned common semiconductor quantum dots, carbon quantum dots, as an emerging carbon nanomaterial, not only have the structural characteristics of carbon nanomaterials, but also have the fluorescence properties of traditional quantum dots...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C09K11/65B82Y30/00B82Y40/00
CPCC01P2002/72C01P2002/82C01P2002/84C01P2004/04C01P2004/52C01P2004/64C09K11/65
Inventor 孙志鹏贾殿赠刘浪惠兰
Owner XINJIANG UNIVERSITY
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