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Research of porous graphene material in capacitive deionization

A capacitive deionization and graphene technology, which is applied in the field of seawater desalination, can solve the problems of poor wettability and low desalination efficiency, and achieve the effect of increasing adsorption capacity, high specific surface area, high adsorption capacity and desalination efficiency

Inactive Publication Date: 2017-09-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, at present, capacitive deionization technology generally uses activated carbon or Ketjen black as the electrode material. The main problem of this material is that the material has poor wettability to water and low desalination efficiency.

Method used

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  • Research of porous graphene material in capacitive deionization
  • Research of porous graphene material in capacitive deionization
  • Research of porous graphene material in capacitive deionization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Add 10ml of styrene and 1ml of methacrylic acid to a 250ml three-neck flask in turn, then add 90ml of distilled water, stir and mix at a medium speed, then add 0.1g of sodium lauryl sulfate, and heat up to 70°C under nitrogen protection. ℃, stir at a medium speed until uniform, usually more than 30 minutes. Then add 0.05g of potassium persulfate, stir at 400r / min, and react for 24h. After cooling to room temperature, a milky white mixed solution was obtained, which was carboxyl-modified polystyrene microspheres.

[0027] (2) Add 50 mg of graphene oxide to 47.5 ml of water, and disperse it with an ultrasonic device for 2 hours to obtain a brown-yellow solution. Add 2.5ml of the above mixed solution, stir and mix well, add 3-4 drops of ammonia water dropwise, and stir at 200r / min for 2h. Then add 0.1g of thiourea and continue to stir at 200r / min for 1h.

[0028] (3) Put the above solution into a 60ml reaction kettle, and heat it with water at 160°C for 5h. Filter ...

Embodiment 2

[0033] (1) Dry Ketjen Black and reserve it for later use.

[0034] (2) Dissolve 0.4g of Ketjen black, 0.05g of conductive carbon black, and 0.05g of PTFE in 30ml of deionized water, and ultrasonically disperse and mix for 30min.

[0035] (3) Keep the temperature of the water bath at 80°C, fix the cut graphite paper on the top of the water bath, drop the above solution onto the graphite paper in batches, disperse evenly by rolling with a glass rod, and continue to drip after the solvent is evaporated to dryness. Add with a roller until the dripping is complete. The electrode sheets were dried in a vacuum oven and then reserved for use.

[0036] Assembly of the capacitive deionization unit

[0037] The capacitive deionization device (that is, the seawater desalination module) is self-made, and the principle refers to the attached image 3 . The prepared electrode sheets were cut into two pieces of the same size and weighed. Then insert into the self-made module, inject 20ml...

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Abstract

The present invention provides research of a graphene-based electrode material in capacitive deionization. According to the present invention, a porous graphene-based electrode material with mutually communicated pore channels is prepared by using a hard template method, and has a significant pore channel structure and hydrophilicity, an electrode required by capacitive deionization is coated with the material by using a self-created drop coating method, and then capacitive deionization characteristic characterization is performed; and the electrode material of the present invention has characteristics of rich pore channels, mutual pore channel communication and hydrophilicity, and provides excellent performances in the capacitive deionization characteristic characterization.

Description

technical field [0001] The invention relates to the technical field of seawater desalination, in particular to a preparation method of a capacitive deionization material, and a desalination and water purification module made thereof. Background technique [0002] Fresh water resources are an indispensable part of human survival and development, and human life activities, social activities and industrial production are inseparable from fresh water. 70% of the earth's surface is covered by seawater, so it can be said that water resources are very rich, but the fresh water resources that can be used by human beings only account for 0.27%. Therefore, how to convert seawater into fresh water that can be used by humans is a very important issue. Traditional seawater desalination technology can be divided into two categories: phase change involving water (thermal method) and phase change not involving water (membrane method). Thermal method and membrane method are two types common...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469B01J20/20B01J20/28B01J20/30C01B32/184
CPCB01J20/20B01J20/28057B01J2220/4806B01J2220/4812C01P2004/03C02F1/4691C02F2201/46
Inventor 杨文刘锦平
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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