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A method for continuous purification of graphite oxide and electrodialysis experimental equipment used

An electrodialysis, graphite technology, applied in electrodialysis, graphite and other directions, can solve the problems of large water consumption, unfavorable electrodialysis, difficult to clean and so on

Active Publication Date: 2018-01-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the laboratory uses a large amount of water to repeatedly wash and centrifuge or filter. This method consumes a lot of water, has low production efficiency, high energy consumption, and cumbersome steps.
In addition, conventional electrodialysis equipment is also used for purification treatment. Since the graphite oxide particles themselves are negatively charged, they are easy to accumulate on the anion exchange membrane, resulting in clogging and difficult cleaning problems, which is not conducive to the continuous operation of the electrodialysis process.
None of these methods are suitable for continuous purification of graphite oxide

Method used

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  • A method for continuous purification of graphite oxide and electrodialysis experimental equipment used
  • A method for continuous purification of graphite oxide and electrodialysis experimental equipment used
  • A method for continuous purification of graphite oxide and electrodialysis experimental equipment used

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: The retention medium is a filter cloth with a pore size of 5-8um, and anion exchange membranes and cation exchange membranes are membranes commonly used in industry

[0031] The electrodialysis experimental equipment is shown in Figure 1(a), the membrane area is 100cm 2 , the width of the compartment is 3mm, four compartments separated by three kinds of medium anion exchange membrane (2), interception medium (3), cation exchange membrane (4) sequentially separate the anode chamber (6), pure water chamber (7) , material liquid chamber (8) and cathode chamber (9), and the tops of the four compartments are open, the intercepting medium is filter cloth with a pore size of 5-8um and a thickness of 0.8mm, and the anode plate (1) and the cathode plate (5) are placed Provide DC voltage on both sides of the device. Dilute the prepared graphite oxide suspension with pure water so that the solid concentration reaches 5g / L, take 30ml, use 30ml pure water to fully wash a...

Embodiment 2

[0033] The structure of the electrodialysis experimental equipment is the same as in Example 1. The prepared graphite oxide suspension is diluted with pure water so that the solid concentration reaches 12.97g / L. Take 30ml, fully wash and centrifuge twice with 30ml pure water, and obtain the solid phase with 30ml pure water is dispersed again, and the graphite oxide solution that obtains is placed in material liquid chamber (8), pure water chamber (7) places pure water, cathode chamber (9) and anode chamber (6) place the Na of 100mg / L 2 SO 4 Solution, load 10V voltage on both sides. The feed-liquid chamber was manually stirred every 10 minutes. Electrodialysis for two hours. K + 、Na + , Mn2+ The sum of the ion concentrations was reduced to 0.23%.

Embodiment 3

[0035] The structure of the electrodialysis experimental equipment is the same as in Example 1. The prepared graphite oxide suspension is diluted with pure water so that the solid concentration reaches 15g / L. Take 30ml, fully wash with 30ml pure water and centrifuge 3 times, and use 30ml of solid phase to obtain Pure water is dispersed again, and the graphite oxide solution that obtains is placed in feed liquid chamber (8), pure water chamber (7) places pure water, cathode chamber (9) and anode chamber (6) place the Na of 1000mg / L 2 SO 4 Solution, load 25V voltage on both sides. The feed-liquid chamber was manually stirred every 10 minutes. Electrodialysis for two hours. K + 、Na + , Mn 2+ The sum of the ion concentrations was reduced to 0.21%.

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Abstract

The invention relates to a continuous purification method of graphite oxide and the used electrodialysis experimental equipment. The electrodialysis equipment is divided into four compartments by anion exchange membrane, retention medium and cation exchange membrane. The four compartments are cathode compartment, anode compartment, feed liquid compartment and pure water compartment; graphite oxide solution to be purified Circulate with pure water to wash and separate until it becomes a stable sol state, and then pass through the above-mentioned electrodialysis experimental equipment for further purification; under the action of a direct current electric field, the cations in the graphite oxide solution pass through the cation exchange membrane to the cathode chamber, and the anions first pass through the retention medium To the pure water chamber, and then through the anion exchange membrane to the anode chamber; the graphite oxide particles themselves are negatively charged, and will also move to the anode and be trapped on the entrapment medium. The method has the advantages of high production efficiency, short cycle, low energy consumption, less water consumption and simple operation.

Description

technical field [0001] The invention relates to a method for continuous purification of graphite oxide, in particular to a method for continuous purification of graphite oxide and electrodialysis experimental equipment used. Background technique [0002] Graphite is formed into graphite oxide in a strong acid system (such as concentrated sulfuric acid, concentrated nitric acid, etc.), after deep liquid phase oxidation and hydrolysis by strong oxidants (such as potassium permanganate, potassium perchlorate, etc.). The substance is a layered compound with a larger interlayer distance than the original graphite. There are a large number of oxygen-containing functional groups on the plane and edges, showing strong polarity, and has the characteristics of large specific surface area and strong particle exchange capacity. Graphene synthesized from graphite oxide has physical and mechanical properties such as high electrical conductivity, high thermal conductivity, high hardness an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/48C01B32/23
Inventor 谭蔚刘颖郝苒杏朱国瑞刘丽艳
Owner TIANJIN UNIV