Method of one-step synthesizing fluorescent carbon dots with corncob as carbon source

A technology of fluorescent carbon dots and corncob, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as inability to complete large-scale production, and achieve the effects of avoiding toxic reagents, mild reaction conditions, and cheap and readily available raw materials

Inactive Publication Date: 2015-11-11
HENAN NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, some natural raw materials have been successfully applied to the synthesis of fluorescent carbon dots, such as using some ingredients (green tea, soybean milk, ginger, sweet potato, flour, orange and banana juice) as carbon sources, but these carbon sources have certain limitations. Unable to complete industrial mass production

Method used

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  • Method of one-step synthesizing fluorescent carbon dots with corncob as carbon source
  • Method of one-step synthesizing fluorescent carbon dots with corncob as carbon source
  • Method of one-step synthesizing fluorescent carbon dots with corncob as carbon source

Examples

Experimental program
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Effect test

Embodiment 1

[0010] Take 0.1g of crushed, washed and dried corncob, 1.5mL of ethylenediamine and 10mL of deionized water, stir them evenly and place them in a 50mL autoclave at 100℃, 120℃, 150℃, 180℃, React at 190°C and 200°C for 6 hours to obtain a brownish-yellow solution. Place the obtained brownish-yellow solution in a centrifuge at a centrifugal rate of 12000r / min for 10min and filter it through a filter membrane with a pore size of 0.2μm. The resulting filtrate is fixed to 100mL In the volumetric flask, use a fluorescence spectrophotometer (FP-6500 fluorescence spectrometer, JASCO) to measure the fluorescence intensity of the resulting solution. The results are shown in Table 1.

[0011] Reaction temperature (℃)100120150180190200 The fluorescence intensity92150480666694658

[0012] It can be seen from Table 1 that as the temperature of the hydrothermal reaction increases, the fluorescence intensity of the obtained fluorescent carbon dots gradually increases, and reaches the maximum ...

Embodiment 2

[0014] Take 0.1g of crushed, washed and dried corncob, 1.5mL of ethylenediamine, and 10mL of deionized water, stir evenly and place in a 50mL autoclave, and react at 190℃ for 2h, 4h, 5h, 6h, 7h respectively And 10h to obtain a brown-yellow solution, place the obtained brown-yellow solution in a centrifuge at a centrifugal speed of 12000r / min for 10min and filter it through a filter membrane with a pore size of 0.2μm. The resulting filtrate is fixed in volume in a 100mL volumetric flask. The fluorescence intensity of the obtained solution was measured by a spectrophotometer (FP-6500 fluorescence spectrometer, Japan Branch Co., Ltd.). The results are shown in Table 2.

[0015] Response time (h)2456710 The fluorescence intensity58210640696644608

[0016] It can be seen from Table 2 that with the extension of the reaction time, the hydrothermal reaction gradually tends to be complete. When the reaction time is 6h, the fluorescence intensity reaches the maximum, so the optimal hyd...

Embodiment 3

[0018] Take 0.1g of crushed, washed and dried corncobs, add 0mL, 0.5mL, 1.0mL, 1.5mL and 2.0mL of ethylenediamine respectively, and then add 10mL of deionized water, stir well and place in 50mL high pressure reaction In the kettle, react at 190°C for 6 hours to obtain a brownish yellow solution. Place the obtained brownish yellow solution in a centrifuge at a centrifugal speed of 12000r / min for 10min and filter it through a filter membrane with a pore size of 0.2μm. Using a 100mL volumetric flask, use a fluorescence spectrophotometer (FP-6500 fluorescence spectrometer, Japan Branch) to measure the fluorescence intensity of the resulting solution. The results are shown in Table 3.

[0019] Ethylenediamine dosage (mL)00.51.01.52.0 The fluorescence intensity133316541698605

[0020] It can be seen from Table 3 that when the amount of ethylenediamine added is 1.5mL, the fluorescence intensity of the synthesized fluorescent carbon dots reaches the maximum, so the best dosage of eth...

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Abstract

The invention discloses a method of one-step synthesizing fluorescent carbon dots with corncobs as a carbon source and belongs to the technical field of synthesis of fluorescent carbon dots. In the technical scheme, the method of one-step synthesizing the fluorescent carbon dots with the corncobs as the carbon source includes the following steps: mixing pre-treated corncobs, ethanediamine and deionized water uniformly, and performing heating reaction to prepare the fluorescent carbon dots through hydrothermal method, microwave method and ultrasound method; or directly calcining the pre-treated corncobs to obtain the fluorescent carbon dots. The raw materials are easy to obtain. The method is simple in processes, is mild in reaction conditions, is simple in operation and is free of toxic reagents. The fluorescent carbon dots can not only be used as a fluorescent probe to detect substance content but also be used in the researching fields of bio-markers, bio-imaging, photo-catalysis, photo-electronic devices, bio-sensors and the like.

Description

Technical field [0001] The invention belongs to the technical field of the synthesis of fluorescent carbon dots, and specifically relates to a method for synthesizing fluorescent carbon dots in one step using corn cobs as carbon sources. Background technique [0002] Carbon nanomaterials mainly include graphene, fullerene, carbon nanotube, carbon nanofiber and nanodiamond. Recently, fluorescent carbon dots have received extensive attention from chemists and material scientists due to their low toxicity, good biocompatibility, high chemical stability, excellent optical stability, and excitation-emission correlation. These advantages make fluorescent carbon dots and There is a substantial difference between traditional semiconductor quantum dots and ordinary fluorescent dyes, and makes fluorescent carbon dots have potential applications in biomarking and imaging, photocatalysis, optoelectronic devices, and biosensors. At present, many methods have been proposed to prepare fluoresc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65
Inventor 冯素玲庞胜彬吴呈珂段俊霞原焕
Owner HENAN NORMAL UNIV
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