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Method for continuously peeling graphite oxide in flowing mode and classifying graphene based on size

A technology of oxidized rock and graphene, applied in chemical instruments and methods, nanotechnology for materials and surface science, carbon compounds, etc., can solve the problems of unobvious size grading, uncontrollable size, and inapplicability, and achieve improvement Quality and size uniformity, improved performance, and cost-effective effects

Pending Publication Date: 2019-08-16
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the method used for size classification of graphene oxide is mainly centrifugal classification, but the size classification of this method is not obvious and the size is uncontrollable, the efficiency is low, and it cannot be applied to industry

Method used

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  • Method for continuously peeling graphite oxide in flowing mode and classifying graphene based on size
  • Method for continuously peeling graphite oxide in flowing mode and classifying graphene based on size
  • Method for continuously peeling graphite oxide in flowing mode and classifying graphene based on size

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1) Graphene oxide preparation:

[0042] Disperse graphite oxide in water to make a concentration of 2g / L. The amount of dispersant added is 1% of the mass of the graphite dispersion. Take 10L of the solution, mix it with 100 polyethylene balls and pour it into the reaction pool. The diameter of the ball is 1cm, density 1.1g / cm 3 . Turn on the ultrasonic device and the stirring device, the ultrasonic frequency is 40 kHz, and the stirring speed is 1000 r / min.

[0043] 2) Graphene oxide size fractionation preparation:

[0044] In the membrane separation device, the pore diameter of the primary separation membrane tube is 50um, the pore diameter of the secondary separation membrane tube is 5um, and the pore diameter of the tertiary membrane tube is 0.5um. Open the valve connected to the membrane separation device, turn on the centrifugal pump, and collect three graphene oxides with different size distributions in beakers.

[0045] figure 1 Process flow chart for the pr...

Embodiment 2

[0047] 1) Graphene oxide preparation:

[0048] Disperse graphite oxide in water to make a concentration of 4g / L. The amount of dispersant added is 2% of the mass of the graphite dispersion. Take 15L of the solution, mix it with 120 polypropylene pellets and pour it into the reaction pool. The diameter of the pellet is 2cm, density 1.2g / cm 3 . Turn on the ultrasonic device and the stirring device, the ultrasonic frequency is 100 kHz, and the stirring speed is 3000 r / min.

[0049] 2) Graphene oxide size fractionation preparation:

[0050] In the membrane separation device, the pore diameter of the primary separation membrane tube is 100um, the pore diameter of the secondary separation membrane tube is 50um, and the pore diameter of the third stage membrane tube is 1um. Open the valve connected to the membrane separation device, turn on the centrifugal pump, and collect three graphene oxides with different size distributions in beakers.

Embodiment 3

[0052] 1) Graphene oxide preparation:

[0053] Disperse graphite oxide in water to a concentration of 1g / L. The amount of dispersant added is 0.5% of the mass of the graphite dispersion. Take 7L of the solution, mix it with 60 polyamide balls and pour it into the reaction pool. The diameter of the ball is 1.5cm, density 1.0g / cm 3 . Turn on the ultrasonic device and the stirring device, the ultrasonic frequency is 60 kHz, and the stirring speed is 2000 r / min.

[0054] 2) Graphene oxide size fractionation preparation:

[0055] In the membrane separation device, the pore diameter of the primary separation membrane tube is 70um, the pore diameter of the secondary separation membrane tube is 2um, and the pore diameter of the tertiary membrane tube is 0.2um. Open the valve connected to the membrane separation device, turn on the centrifugal pump, and collect three graphene oxides with different size distributions in beakers.

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Abstract

The invention relates to the field of graphene preparation, and aims to provide a method for continuously peeling graphite oxide in a flowing mode and classifying graphene based on size. Flexible graphene oxide and rigid graphene oxide have different performances on penetrating a porous ceramic separation membrane; a graphene oxide-graphite oxide mixture obtained through peeling is made to go through a mono-channel pipe in a flowing mode, wherein the mono-channel pipe is filled with multilayer ceramic separation membranes with different diameters; and when the graphene oxide is separated, themultilevel mono-channel pipe with decreasing diameters is used to classify graphene oxide based on the size. The problems that according to an ultrasonic peeling method, the peeling is non-uniform, the graphene oxide product is severely damaged, and the size is not uniform, are solved. The quality and size uniformity of graphene oxide are greatly improved. Graphene oxide with a size in a targetedrange is obtained through a multistage membrane separation technology. The preparation is continuous. The preparation efficiency is high. The technology is simple, the cost is low, and the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of graphene oxide preparation, and in particular relates to a method and device for continuously classifying graphene oxide with different sizes. Background technique [0002] In recent years, graphene oxide has been widely studied as a new material in various fields, such as composite materials, membrane separation materials, battery materials, drug carriers, aerogels and fibers, etc. Graphene oxide is a graphene derivative derived from graphite oxidation. The steps of graphite oxidation are very complicated. At present, the oxidation methods for preparing graphene oxide mainly include Hummers method, Brodie method and Standenmaier method. Among them, the Hummers method is more and more used in the industrial large-scale production of graphite oxide because the oxidation conditions are relatively safe, the oxidation steps are relatively simple, and the graphite oxide quality is the highest. [0003] The lateral siz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/198B82Y30/00B82Y40/00
CPCC01B32/198B82Y30/00B82Y40/00
Inventor 暴宁钟王顺沈丽明李畅史叶勋
Owner NANJING UNIV OF TECH
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