High-efficiency purification method of water-dispersed carbon nanomaterial

A technology of carbon nanomaterials and purification method, which is applied in the field of efficient purification of water-dispersible carbon nanomaterials, can solve problems such as inability to achieve high yield, and achieve the effects of low cost, high yield, and excellent optoelectronic properties.

Active Publication Date: 2019-12-20
WUHAN UNIV
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a high-efficiency purification method of water-dispersible carbon nanomaterials. Aiming at the mixture of highly water-dispersible azo dye carbon nanomaterials obtained by ball milling, common low-cost and environmentally friendly inorganic salt / alkali aqueous solutions can be used to efficiently assist centrifugation Separation and purification of carbon nanomaterials without affecting their physical and chemical properties such as dispersibility and photoelectrochemical properties, thereby effectively overcoming the problem that simple centrifugation, dialysis and filtration cannot purify a mixture of azo dye ball-milled carbon nanomaterials with high yield and low cost. Paves the way for large-scale preparation of highly water-dispersible and surface-derivatizable carbon nanomaterials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Dissolve 3 mg of Congo red balls in 1 mL of water, ultrasonically disperse for 1 minute, transfer the solution into a dialysis bag for dialysis for 24 hours, the aqueous solution outside the dialysis bag does not change color, but the dialysis bag absorbs a large amount of red, indicating that free Congo red molecules cannot be removed by dialysis .

Embodiment 2

[0024] Dissolve 4 mg of the ball-milled mixture of single-walled carbon nanotubes and Congo red with a mass ratio of 1:3 in 1 mL of water, ultrasonically disperse for 1 minute, and centrifuge at 15,000 rpm for 10 minutes. There is a black precipitate at the bottom of the obtained solution, and the upper solution is still relatively dense. Deep black red; in contrast, the upper layer solution after centrifugation of 3mg / mL Congo red aqueous solution is dark red. This phenomenon shows that even with a higher centrifugation speed, some highly dispersed carbon nanotubes cannot be centrifuged, and this phenomenon is also applicable to the centrifugal separation of graphene nanosheets.

Embodiment 3

[0026] Fullerene C with a mass ratio of 1:3 60 Dissolve 4 mg of the ball-milled mixture with Congo red in 1 mL of water, and ultrasonically disperse for 1 minute, then use a 0.1 micron pore size mixed cellulose filter to filter and wash the resulting solution until the filtrate has no obvious red color. During the filtration process, a brown C on the filter membrane can be observed 60 There are few solid residues, and the filtrate in the later stage of filtration and washing is light brown, indicating that there are some highly dispersed C 60 Through the filter membrane to enter the filtrate, the loss of the filtration and washing process is relatively large, and the speed is very slow.

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Abstract

The invention provides a high-efficiency purification method of a water-dispersed carbon nanomaterial. A ball-milling mixture of a carbon nanomaterial, water-soluble azo dye molecules and derivable modifiable molecules is dissolved with water, and then mixed well with an inorganic salts/aqueous alkali, centrifugation is conducted for 1-30 minutes at the centrifugal speed of 3000-10000 rounds/minute, a supernatant dye solution is sucked out, and then water is added to ultrasonically dissolve bottom precipitation; and the salting-out assisted centrifugation purification process is repeated untila product is washed, and a carbon nanomaterial dispersed in the water is obtained. The high-efficiency purification method has the outstanding characteristics that common alkali and salt are used asan auxiliary settling agent, in a short time and at a low centrifugal speed, high-efficiency separation of free-state dye molecules from the water-dispersed carbon nanomaterial can be realized, in thepurification process of the water-dispersed carbon nanomaterial, the loss of the carbon nanomaterial is small, a purification reagent is environment-friendly, the cost is low, and the purification process has no effect on the physical and chemical properties of the carbon nanomaterial such as the water dispersibility and the photoelectric performance.

Description

technical field [0001] The invention belongs to the field of material synthesis, and in particular relates to a high-efficiency purification method of water-dispersible carbon nanomaterials. Background technique [0002] Carbon nanomaterials represented by fullerenes, carbon nanotubes and graphene have unique structural, photoelectric, mechanical and other physical and chemical properties, and have led many revolutions in the field of materials science. Medicine and many other fields have broad application prospects. However, a key factor limiting the large-scale application of these materials is how to achieve efficient dispersion in various solvents, which is an important prerequisite for the construction of a large number of carbon-based functional materials, films and devices. Compared with organic solvents, aqueous solvents have the characteristics of environmental protection, low cost, and good biocompatibility. The preparation of aqueous solutions of carbon nanomater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/174C01B32/17C01B32/196C01B32/194C01B32/198C01B32/156C01B21/082
CPCC01B32/174C01B32/17C01B32/196C01B32/194C01B32/198C01B32/156C01B21/0605
Inventor 胡成国杨佳
Owner WUHAN UNIV
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