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A method for continuously preparing fluorescent carbon nanoparticles

A technology of carbon nanoparticles and fluorescence, applied in the direction of nano-carbon, nanotechnology, chemical instruments and methods, etc., can solve the problems of easy storage of corncobs, huge supply, etc., achieve uniform and stable physical and chemical properties, and simple preparation methods , the effect of easy industrial production

Inactive Publication Date: 2017-08-01
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, all wastes cannot meet the characteristics of easy storage of corncobs and huge supply.

Method used

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  • A method for continuously preparing fluorescent carbon nanoparticles
  • A method for continuously preparing fluorescent carbon nanoparticles
  • A method for continuously preparing fluorescent carbon nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]Take the corncobs and bake them in an oven at 60°C for 24 hours. The baked corn cobs are put into a quartz tube furnace and calcined at high temperature under the protection of an argon atmosphere. (Parameters: 5°C / min to raise the temperature to 1000°C, and keep it at 1000°C for 4 hours and then cool naturally.) During the whole reaction process, the outlet pipe was passed into a glass bottle filled with ultrapure water to receive the gas from the tube furnace. Outgoing product. After the reaction was completed, the product was put into a dialysis bag with a molecular weight cut-off of 300 Daltons and dialyzed for 7 days to obtain the final aqueous solution of carbon nanoparticles. After evaporating with a rotary evaporator, the brown powder is taken out to be carbon nanoparticles.

Embodiment 2

[0037] Take the corncobs and bake them in an oven at 60°C for 24 hours. The baked corn cobs are put into a quartz tube furnace and calcined at high temperature under the protection of an argon atmosphere. (Parameters: 10°C / min heating up to 1200°C, and cooling naturally after 10 hours of heat preservation at 1200°C.) During the entire reaction process, the gas outlet pipe was passed into a glass bottle filled with ultrapure water to receive the gas from the tube furnace. Outgoing product. Finally, dichloromethane was mixed with an equal solution volume of the aqueous solution of carbon nanoparticles. The mixture was shaken back and forth in a separatory funnel for 10 minutes. After the solution is static and stratified, the aqueous solution containing carbon nanoparticles in the lower layer is taken. Repeat the above operation 15 times. After evaporating with a rotary evaporator, the brown powder is taken out to be carbon nanoparticles.

Embodiment 3

[0039] Take the corncobs and bake them in an oven at 60°C for 24 hours. The baked corn cobs are put into a quartz tube furnace and calcined at high temperature under the protection of an argon atmosphere. (Parameters: 5°C / min heating up to 1100°C, and cooling naturally after 6 hours at 1100°C). Outgoing product. After the reaction is finished, centrifuge for 4 hours in a centrifuge with a centrifugal speed greater than 20,000 rpm. Take out the centrifuge tube and pour off the supernatant. Pour 50ml of ultrapure water into a centrifuge tube and put it into an ultrasonic cleaner for 30 minutes of sonication. Repeat the above centrifugation step 10 times. Finally, the brown precipitate in the lower layer was put into a vacuum freezer and freeze-dried at -40°C for 24 hours. The finally obtained brown powder is carbon nanoparticle powder.

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Abstract

The invention relates to a method for continuously preparing fluorescent carbon nanoparticles. The method comprises the steps: baking washed corncobs in a baking oven; putting the baked corncobs in a quartz tubular furnace; introducing inert gas into the quartz tubular furnace, and carrying out calcination at a high temperature; always introducing a gas outlet pipe into a glass beaker filled with ultrapure water in a whole reaction process so as to collect tail gas containing carbon nanoparticles; and after reaction ends, separating the carbon nanoparticles dispersed in the ultrapure water by using a variety of methods, thereby obtaining the fluorescent carbon nanoparticles. The fluorescent carbon nanoparticles are a renewable biomass material, and the preparation method is simple, so that industrial production is facilitated.

Description

technical field [0001] The invention belongs to the field of preparation of fluorescent materials, in particular to a method for continuously preparing fluorescent carbon nanoparticles. Background technique [0002] Reducing the size of the equipment, strengthening the reaction process, increasing the conversion rate of raw materials and reducing the impact of the production process on the environment are the common efforts of the material industry today. Since the end of the last century, international well-known chemical companies including Bayer and famous research institutions such as Stanford have successively carried out scientific research on efficient small-scale reaction equipment. In order to distinguish it from the previous large-scale reaction equipment and systems, researchers dubbed this field the field of microreactors. Compared with the previous large-scale reaction equipment, the physical and chemical properties of the products prepared by the microreactor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65C01B32/15B82Y40/00
Inventor 王宏志魏婕张青红李耀刚
Owner DONGHUA UNIV
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