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Nitrogen-doped self-shrinking 3D graphene for capacitive deionization electrode and preparation method thereof

A technology of capacitive deionization and graphene, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve problems such as poor anion and cation, large pore structure, and influence on the CDI ability of three-dimensional graphene, so as to avoid Effects of decreased specific surface area, increased specific surface area, and excellent CDI capability

Inactive Publication Date: 2020-01-07
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large pore structure of traditional three-dimensional graphene, it cannot interact with anions and cations well during the desalination process, thus affecting the CDI ability of three-dimensional graphene.

Method used

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  • Nitrogen-doped self-shrinking 3D graphene for capacitive deionization electrode and preparation method thereof
  • Nitrogen-doped self-shrinking 3D graphene for capacitive deionization electrode and preparation method thereof
  • Nitrogen-doped self-shrinking 3D graphene for capacitive deionization electrode and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] Add 2.5 mL of 98% pyrrole to 30 mL of homogeneous graphene oxide aqueous solution with a concentration of 2 mg / mL, and mix uniformly for 20 min. Get above-mentioned aqueous solution and add in the hydrothermal kettle, then hydrothermally 12 hours at 180 ℃. After the graphene oxide hydrogel obtained in the above steps was washed 3 times with deionized water, the graphene hydrogel was subjected to self-shrinkage treatment. The self-shrinking treatment is: place the washed graphene hydrogel at 25°C for 3h, add 0.08mol / L ethylenediamine to react for 6h, wash with deionized water, and place at 25°C for 2h. The shrunken graphene hydrogel was then freeze-dried to preserve its internal pore structure. Finally, the freeze-dried nitrogen-doped porous 3D graphene was placed in a tube furnace and annealed with Ar gas at 1000°C for 2 hours, and the product nitrogen-doped self-shrinking porous 3D graphene (N-S3DG) was finally obtained. .

Embodiment 2

[0026] Add 2.5 mL of 98% pyrrole to 30 mL of homogeneous graphene oxide aqueous solution with a concentration of 2 mg / mL, and mix uniformly for 20 min. Get above-mentioned aqueous solution and add in the hydrothermal kettle, then hydrothermally 12 hours at 180 ℃. After the graphene oxide hydrogel obtained in the above steps was washed 3 times with deionized water, the graphene hydrogel was subjected to self-shrinkage treatment. The self-shrinking treatment is: place the washed graphene hydrogel at 20°C for 3h, add 0.08mol / L ethylenediamine to react for 6h, wash with deionized water, and place at 20°C for 2h. The shrunken graphene hydrogel was then freeze-dried to preserve its internal pore structure. Finally, the freeze-dried nitrogen-doped porous 3D graphene was placed in a tube furnace and annealed with Ar gas at 1000°C for 2 hours, and the product nitrogen-doped self-shrinking porous 3D graphene (N-S3DG) was finally obtained. .

Embodiment 3

[0028] Add 2.5 mL of 98% pyrrole to 30 mL of homogeneous graphene oxide aqueous solution with a concentration of 2 mg / mL, and mix uniformly for 20 min. Get above-mentioned aqueous solution and add in the hydrothermal kettle, then hydrothermally 12 hours at 180 ℃. After the graphene oxide hydrogel obtained in the above steps was washed 3 times with deionized water, the graphene hydrogel was subjected to self-shrinkage treatment. The self-shrinking treatment is as follows: place the washed graphene hydrogel at 30°C for 3h, add 0.08mol / L ethylenediamine to react for 6h, wash with deionized water, and place at 30°C for 2h. The shrunken graphene hydrogel was then freeze-dried to preserve its internal pore structure. Finally, the freeze-dried nitrogen-doped porous 3D graphene was placed in a tube furnace and annealed with Ar gas at 1000°C for 2 hours, and the product nitrogen-doped self-shrinking porous 3D graphene (N-S3DG) was finally obtained. .

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Abstract

The invention discloses a nitrogen-doped self-shrinkage 3D graphene for a capacitive deionization electrode and a preparation method thereof. pyrroles are added as a nitrogen source for nitrogen doping of a porous graphene hydrogel synthesis process; nitrogen doping helps introduce nitrogen atoms onto the edges and the defective parts of graphene to improve the electrical and chemical properties of graphene; the pyrroles can avoid auto-deposition during synthesis and self-shrinkage of graphene sheets, to prevent excessive collapse of pore structures during self-shrinkage and further to avoid consequent electrical and adsorption property deterioration; therefore, the nitrogen-doped self-shrinkage 3D graphene for a capacitive deionization electrode can solve the problem that existing three-dimensional graphene is large in pore structure and fails to interact with anions and cations during desalination to affect CDI (capacitive deionization) capacity; compared with other drying manners, freeze-drying treatment can effectively maintain the internal pore structure of the graphene.

Description

technical field [0001] The invention discloses a nitrogen-doped self-shrinking 3D graphene used for capacitive deionization electrodes, and also provides a preparation method for the graphene, which relates to the field of electrode materials, especially graphene electrode materials, and its desalination in seawater field applications. Background technique [0002] Water scarcity is one of the greatest global challenges of our time, and the only way to increase the availability of water beyond the hydrological cycle is seawater desalination and water recycling. Among others, desalination provides a method for a seemingly unlimited, steady supply of high-quality water without compromising natural freshwater ecosystems. Capacitive deionization (CDI), as an emerging seawater desalination technology, has significant advantages compared with traditional desalination methods. For example, a large amount of corrosive secondary wastewater will be generated during the operation of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/194C02F1/469
CPCC01B32/194C02F1/4691
Inventor 钱明段蒙娜张大伟许迪欧
Owner JILIN UNIV
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