Method for preparing graphite by using hydraulic cavitation liquid-phase stripping

A liquid phase exfoliation and graphene technology, applied in the directions of graphene, single-layer graphene, chemical instruments and methods, etc., can solve the problems of low exfoliation efficiency, low output and high equipment requirements, and achieve easy large-scale industrial production, The effect of low production cost and simple equipment

Inactive Publication Date: 2018-12-11
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods still have disadvantages such as high e

Method used

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  • Method for preparing graphite by using hydraulic cavitation liquid-phase stripping
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  • Method for preparing graphite by using hydraulic cavitation liquid-phase stripping

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Combined with the manual figure 2 The technical scheme of the present invention is reacted in a self-made device: the device includes a raw material tank 1, a pump 2, a pressure gauge 3, an orifice 7 and a product tank 5, and the feed inlet of the pump 2 is connected to the raw material The tank 1 is connected, the discharge port is connected with the inlet of the orifice 7, and the outlet of the orifice 7 is connected with the product tank 6; the pressure gauge 3 is immersed in the constant temperature water bath 5; the pump 2 A pressure gauge 3 is provided on the connecting pipeline with the orifice plate 7; both ends of the orifice plate 7 are connected to the pipeline through flanges.

[0037] 1) Take pure isopropanol as solvent, Tween 80 as surfactant, configure graphite concentration as the dispersion liquid of 3g / L, surfactant concentration 0.5g / L, fully stir, obtain graphite dispersion liquid;

[0038] 2) Use a pump to send the graphite dispersion liquid at a ...

Embodiment 2

[0041] Combined with the manual figure 1The technical scheme of the present invention reacts in a self-made device: the device comprises a raw material tank 1, a pump 2, a pressure gauge 3, a valve 4 and a product tank 5, and the feed inlet of the pump 2 and the raw material tank 1 connection, the discharge port is connected with the inlet of the valve 4, and the outlet of the valve 4 is connected with the product tank 6; the pressure gauge 3 is immersed in the constant temperature water bath 5; the pump 2 and the valve 4 A pressure gauge 3 is provided on the connecting pipeline.

[0042] 1) Take pure N-methylpyrrolidone as a solvent and sodium taurodeoxycholate as a surfactant, configure a dispersion with a graphite concentration of 30 g / L and a surfactant concentration of 0.1 g / L, and fully stir to obtain a graphite dispersion;

[0043] 2) Use a pump to send the graphite dispersion at a flow rate of 1L / h into a valve with an opening of 0.02mm, maintain the cavitation pressu...

Embodiment 3

[0046] Combined with the manual image 3 The technical scheme of the present invention reacts in the self-made device: described device comprises raw material tank 1, pump 2, pressure gauge 3, Venturi tube 8 and product tank 5, and the inlet of described pump 2 and The raw material tank 1 is connected, the outlet is connected with the inlet of the Venturi tube 8, and the outlet of the Venturi tube 8 is connected with the product tank 6; the pressure gauge 3 is immersed in the constant temperature water bath 5; A pressure gauge 3 is provided on the connecting pipeline between the pump 2 and the Venturi tube 8 .

[0047] 1) Take the N-methylpyrrolidone-water mixed solution with a volume ratio of 2:1 as the solvent, sodium dodecylbenzenesulfonate as the surfactant, configure the graphite concentration as 50g / L, and the surfactant concentration as 0.1g / L The dispersion of L is fully stirred to obtain a graphite dispersion;

[0048] 2) Use a pump to send the graphite dispersion l...

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Abstract

The invention discloses a method for preparing graphite by using hydraulic cavitation liquid-phase stripping. The method comprises the following steps of dispersing graphite into a solvent containinga surfactant, and fully stirring, so as to obtain a dispersion solution of graphite; enabling a pump to send the dispersion solution of graphite into a cavitation element at flow rate of 0.5 to 50000L/h, maintaining the cavitation pressure at 0.1 to 50MPa, and maintaining the system temperature at 4 to 50 DEG C in the cavitation process, so as to obtain a primary cavitated dispersion solution; continuing to send the primary cavitated dispersion solution into the cavitation element, and repeating the cavitation operation for 1 to 200 times, so as to obtain the dispersion solution after cyclic cavitation; collecting the dispersion solution after cyclic cavitation, centrifuging for 5 to 120min at the rotation speed of 500 to 1000rpm, obtaining a supernatant, and freeze-drying, so as to obtaina graphene powder. The method has the advantages that the technical equipment is supplied; the operation is simple, the stripping efficiency is high, the product quality is high, the energy consumption is low, the pollution to environment is avoided, the scale production is easy, and the application prospect is broad.

Description

technical field [0001] The invention relates to a method for preparing graphene by hydraulic cavitation liquid phase exfoliation, and belongs to the technical field of graphene preparation. Background technique [0002] Graphene, a two-dimensional layered nanomaterial with a thickness of only one carbon atom. Due to its unique and excellent physical and chemical properties, graphene has shown great application prospects in many fields, such as electronic information, photonics, catalysis, and energy storage. However, to realize these potential applications of graphene, high-quality graphene must be prepared on a large scale at a relatively low cost. In recent years, researchers have invested a lot of research energy in the preparation technology of graphene and made remarkable progress. [0003] At present, the preparation techniques of graphene mainly include chemical vapor deposition (CVD), redox method, epitaxial growth method, electrochemical method and liquid phase ex...

Claims

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Application Information

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IPC IPC(8): C01B32/19
CPCC01B32/19C01B2204/02C01B2204/04C01B2204/32
Inventor 张智亮计建炳金海伦
Owner ZHEJIANG UNIV OF TECH
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