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N, S-doped carbon quantum dots based on choline ionic liquid and preparation method thereof

An ionic liquid, carbon quantum dot technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of weak fluorescence intensity, uneven particle size distribution, poor stability, etc.

Inactive Publication Date: 2021-05-11
SHENYANG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dispersion of carbon quantum dots prepared only by pyrolysis method is not ideal, the particle size distribution is not uniform enough, and its fluorescence intensity is weak and its stability is poor.

Method used

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  • N, S-doped carbon quantum dots based on choline ionic liquid and preparation method thereof
  • N, S-doped carbon quantum dots based on choline ionic liquid and preparation method thereof
  • N, S-doped carbon quantum dots based on choline ionic liquid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Choline L-bitartrate and thiobetaine 8 were weighed in a molar ratio of 1:1, prepared into an aqueous solution, dried to remove the solvent, then added to a 50ml crucible, and the crucible was placed in a muffle furnace for anaerobic Under the conditions of 380 ° C high temperature pyrolysis for 2.5 hours, after the crucible is cooled, take it out to obtain a solid mixture A;

[0035] Add 50mg of solid mixture A to 50ml of aqueous hydrogen peroxide solution, ultrasonically treat for 3h, transfer the mixture solution to a centrifuge tube, centrifuge at 11000r / min for 10min, take the supernatant after centrifugation, and then filter until no solid remains On the filter paper, transfer the filtered solution to the pretreated 1200Da dialysis bag to start dialysis. The dialysis solution is distilled water. The dialysis time is 24 hours, and the water is changed every 4 hours. After the dialysis, the carbon quantum dot solution is obtained. Then freeze-dry for 11 hours to obt...

Embodiment 2

[0040]Choline bitartrate and thiobetaine 8 are weighed in a molar ratio of 1:1.2, formulated into an aqueous solution, dried to remove the solvent, then added to a 50ml crucible, and the crucible is put into a muffle furnace under anaerobic conditions at 350 Crack at high temperature for 2 hours, take out the crucible after cooling, and obtain solid mixture A;

[0041] Add 30mg of solid mixture A to 40ml of hydrogen peroxide aqueous solution, sonicate for 3h, transfer the mixture solution to a centrifuge tube, centrifuge at 10000r / min for 5min, take the supernatant after centrifugation, and then filter until no solid remains On the filter paper, transfer the filtered solution to the pretreated 1000Da dialysis bag to start dialysis. The dialysis solution is distilled water. The dialysis time is 24 hours, and the water is changed every 4 hours. After the dialysis, the carbon quantum dot solution is obtained. Then freeze-dry for 10 h to obtain N, S-doped carbon quantum dots based...

Embodiment 3

[0043] Weigh D-choline bitartrate and thiobetaine 10 in a molar ratio of 1:1.2, prepare an aqueous solution, dry to remove the solvent, then add it to a 50ml crucible, put the crucible in a muffle furnace, and anaerobically Crack at 400°C for 3 hours, take out the crucible after cooling, and obtain solid mixture A;

[0044] Add 45mg of solid mixture A to 45ml of hydrogen peroxide aqueous solution, sonicate for 3h, transfer the mixture solution to a centrifuge tube, centrifuge at 12000r / min for 15min, take the supernatant after centrifugation, and then filter until no solid remains On the filter paper, transfer the filtered solution to the pretreated 1200Da dialysis bag to start dialysis. The dialysis solution is distilled water. The dialysis time is 24 hours, and the water is changed every 4 hours. After the dialysis, the carbon quantum dot solution is obtained. Then freeze-dry for 12 hours to obtain N, S-doped carbon quantum dots based on choline-based ionic liquid.

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Abstract

The invention discloses N, S-doped carbon quantum dots based on a choline ionic liquid and a preparation method thereof. A choline ionic liquid and a thiobetaine compound are mainly used as raw materials, carbon quantum dots are rapidly prepared by adopting a high-temperature cracking and chemical oxidation method, and the high-purity N, S-doped carbon quantum dots can be obtained after ultrasonic treatment, centrifugation, filtration, dialysis and freeze drying. The preparation method disclosed by the invention is simple and rapid, the raw materials are not easy to volatilize and environment-friendly, and the prepared carbon quantum dots have the advantages of uniform particle size distribution, high fluorescence intensity and good stability and have a good development prospect in rapid analysis and detection.

Description

technical field [0001] The invention relates to a preparation method of carbon quantum dots, in particular to an N, S doped carbon quantum dot based on choline ionic liquid and a preparation method thereof. Background technique [0002] Carbon quantum dots (carbon quantum dots, CQD) is a carbon-based zero-dimensional material. Carbon quantum dots have the characteristics of excellent optical properties, good water solubility, environmental friendliness and good biocompatibility, and also have the advantages of wide source of raw materials for preparation and low synthesis cost. Carbon quantum dots currently have good application prospects in biological imaging, environmental monitoring, fluorescent probes, catalyst preparation, detection of heavy metals, organic pollutants, and pesticide residues. [0003] Since carbon quantum dots were first discovered, a variety of preparation methods of carbon quantum dots have been reported, which are divided into two categories: "top-d...

Claims

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Application Information

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IPC IPC(8): C09K11/65C09K11/02B82Y30/00
CPCB82Y30/00C09K11/025C09K11/65
Inventor 王蒴田宏哲付浩亮赵瑛博胡睿李亮亮
Owner SHENYANG AGRI UNIV
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