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Green method for preparing high-quality graphene powder on large scale at ultra-low cost

A graphene powder, high-quality technology, applied in graphene, chemical instruments and methods, nano-carbon, etc., can solve problems such as high cost, toxicity, flammability and explosion

Pending Publication Date: 2021-09-10
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, on the one hand, these organic medicines are toxic, flammable and explosive, and on the other hand, the cost is much higher

Method used

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  • Green method for preparing high-quality graphene powder on large scale at ultra-low cost
  • Green method for preparing high-quality graphene powder on large scale at ultra-low cost
  • Green method for preparing high-quality graphene powder on large scale at ultra-low cost

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Experimental program
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Effect test

preparation example Construction

[0031] Preparation of Hydrophilic Polymer Solutions. The hydrophilic polymer is dissolved in water to obtain an aqueous solution containing the hydrophilic polymer. Wherein water can be ultrapure water. Among them, the hydrophilic polymers include sodium dodecylbenzene sulfonate, sodium lauryl sulfate, polyvinylpyrrolidone, sodium oleate, sodium lauryl sulfate, sodium dioctyl succinate, sodium glycocholate, One or a mixture of benzalkonium chloride, polyethylene glycol, polyoxyethylene ether series, and alkanolamide series. The content of the hydrophilic polymer in the aqueous solution containing the hydrophilic polymer can be 0.5-20 wt%.

[0032] adding the alkaline reagent into the aqueous solution containing the hydrophilic polymer and mixing uniformly to obtain an aqueous solution containing the hydrophilic polymer and the alkaline reagent. Wherein, the specified alkaline reagents include sodium carbonate, sodium bicarbonate, potassium carbonate, potassium bicarbonate, ...

Embodiment 1

[0043] Dissolve 1 gram of sodium dodecylbenzenesulfonate in 100 grams of ultrapure water, then add 1 gram of ammonium bicarbonate, stir to dissolve it completely, and obtain an aqueous solution containing hydrophilic polymers and alkaline reagents. Then add 10 grams of expanded graphite, and grind at a high speed for 0.5 hour (8 m / s at a linear velocity) in a grinder, and take out the ground graphite slurry. The graphite slurry is diluted to 500 milliliters with ultrapure water, and placed in a powerful ultrasonic machine for ultrasonic treatment for 0.5 hours (ultrasonic treatment power 2.4kW), to obtain a graphene aqueous solution in which graphene is uniformly dispersed;

[0044] The prepared graphene aqueous solution was left to stand for 12 hours, and the graphene stable dispersion solution (or graphene dispersion solution) of the upper layer was taken, and 0.5 gram of magnesium chloride was added and stirred evenly to obtain a graphene precipitation solution;

[0045] Th...

Embodiment 2

[0049] Dissolve 1 gram of sodium lauryl sulfate in 100 grams of ultrapure water, then add 1 gram of ammonia water (concentration: 1 wt%), stir to make it completely dissolved, and obtain an aqueous solution containing hydrophilic polymers and alkaline reagents. Then add 10 grams of expanded graphite, grind at a high speed for 0.5 hour (line speed 10 m / s) in the grinder, and take out the graphite slurry that has been ground. The graphite slurry is diluted to 500 milliliters with ultrapure water, and placed in a powerful ultrasonic machine for ultrasonic treatment for 0.5 hours (ultrasonic treatment power 3kW), to obtain a graphene aqueous solution in which graphene is uniformly dispersed;

[0050] The prepared graphene aqueous solution was left to stand for 12 hours, and the graphene stable dispersion solution (or graphene dispersion solution) of the upper layer was taken, and 0.5 gram of barium chloride was added and stirred to obtain the graphene precipitation solution;

[00...

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Abstract

The invention relates to a green method for preparing high-quality graphene powder on a large scale at an ultra-low cost, which comprises the steps of (1) adding expanded graphite into an aqueous solution containing hydrophilic macromolecules and an alkaline reagent, mixing, and grinding to obtain graphite slurry; (2) carrying out ultrasonic treatment on the obtained graphite slurry, standing for a certain time, and selecting a graphene dispersion solution at the upper layer; (3) adding a precipitator into the obtained graphene dispersion solution, and carrying out suction filtration to obtain a graphene cake; and (4) washing and drying the obtained graphene cake, and roasting in a protective atmosphere at 350-800 DEG C to obtain the high-quality graphene powder.

Description

technical field [0001] The invention relates to a large-scale, ultra-low-cost green method for preparing high-quality graphene powder, belonging to the field of graphene preparation. Background technique [0002] Graphene is one of the greatest materials discovered by humans in the 21st century. It is known as the king of new materials because of its characteristics of being the thinnest in nature, the highest strength, and the highest electrical and thermal conductivity. With the gradual deepening of graphene research in the scientific community, more and more unique properties of graphene are reflected in device applications, and a wave of technological research on graphene industrial production has been set off worldwide. [0003] At present, the common large-scale preparation process of graphene on the market mostly adopts the traditional oxidation method. This method is adopted by most enterprises because it was discovered earlier and the technology is more mature. Ho...

Claims

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Application Information

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IPC IPC(8): C01B32/19C01B32/194
CPCC01B32/19C01B32/194C01B2204/32
Inventor 黄富强刘战强金浩
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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