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Defect-rich carbon electrode derived from silicon sphere poly-dopamine cobalt compound and preparation and application of defect-rich carbon electrode

A dopamine cobalt and compound technology, which is applied in the fields of salt water desalination and environmental engineering, and achieves the effects of good capacitance desalination ability, good electrical conductivity and stable adsorption.

Pending Publication Date: 2022-05-27
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no literature report on defect-rich carbon-based electrode materials prepared by calcining polydopamine-cobalt nitrate composites coated with silicon spheres.

Method used

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  • Defect-rich carbon electrode derived from silicon sphere poly-dopamine cobalt compound and preparation and application of defect-rich carbon electrode
  • Defect-rich carbon electrode derived from silicon sphere poly-dopamine cobalt compound and preparation and application of defect-rich carbon electrode
  • Defect-rich carbon electrode derived from silicon sphere poly-dopamine cobalt compound and preparation and application of defect-rich carbon electrode

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Effect test

Embodiment 1

[0028] Preparation of porous carbon electrodes derived from polydopamine materials coated only with silicon spheres for comparative carbon electrodes.

[0029] In order to facilitate the comparison of the products of the present invention, we have prepared comparative carbon electrodes, which are respectively used as the electrodes of the capacitive desalination device, and the specific preparation method is as follows:

[0030] (1) First, 500 mg of dopamine hydrochloride and 7 mL of tetraethyl orthosilicate were dissolved in 160 mL of a solution containing ammonia, ethanol and deionized water, and stirred at room temperature for 30 minutes.

[0031] (2) Then, carry out centrifugation and washing at room temperature, wash the product 3 times with ethanol, then wash 3 times with water, and dry to obtain the silicon-containing polydopamine hydrochloride complex.

[0032] (1) The above product is then calcined in an argon atmosphere to obtain a carbon-silicon composite.

[0033]...

Embodiment 2

[0044] Preparation of Porous Carbon Electrodes Derived from Polydopamine-Cobalt Nitrate Composite Only for Comparative Carbon Electrodes

[0045] (1) First, 500 mg of dopamine hydrochloride and 8 mg of cobalt nitrate were dissolved in 160 mL of a solution containing ammonia, ethanol and deionized water, and stirred at room temperature for 30 minutes.

[0046] (2) Then, centrifuge and wash at room temperature, wash the product 3 times with ethanol, then wash 3 times with water, and dry to obtain the polymerized dopamine hydrochloride and cobalt nitrate complex.

[0047] (4) The above product is then calcined in an argon atmosphere to obtain a carbon-cobalt composite.

[0048] (4) Soak the above material in 10% hydrofluoric acid solution, centrifuge and wash at room temperature, wash the product 3 times with ethanol, then wash 3 times with water, and obtain porous hollow cobalt-doped carbon after drying ball.

[0049] (5) Mix the above product with carbon black and PTFE at a r...

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Abstract

The invention discloses a method for preparing a defect-rich carbon-based electrode material based on a silicon sphere-coated polydopamine and cobalt nitrate compound and application of the defect-rich carbon-based electrode material to the field of efficient capacitive deionization desalination. The specific manufacturing method comprises the following steps: firstly synthesizing a polydopamine and cobalt nitrate compound coated with silicon balls, then carrying out high-temperature calcination and washing in an argon environment to obtain a defect-rich porous carbon material, then mixing porous carbon with a conductive agent carbon black and a binder PTFE, pressing the mixture on graphite paper, and drying to prepare a porous carbon electrode so as to form the symmetric capacitance desalting device. In the capacitive deionization process, the desalting capacity of porous carbon derived from a mixture of polydopamine and cobalt nitrate coated with the silicon balls reaches up to 32.9 mg g <-1 > and is 1.3-2.0 times that of other contrast carbon electrodes, and the electrode is relatively stable in adsorption. When the defect-rich porous carbon material prepared by the method is used as an electrode material, the electro-adsorption capacity of a capacitance desalting device can be greatly improved, and the defect-rich porous carbon material has a good development prospect in the field of salt water desalination.

Description

technical field [0001] The invention relates to the preparation of electrode materials in the technical field of environmental engineering, which is mainly used in the capacitive deionization and desalination process, belongs to the application field of water treatment technology, and particularly belongs to the technical field of salt water desalination. Background technique [0002] my country is a country seriously short of water and is facing a serious shortage of fresh water resources, and more than 97% of the world's water resources are seawater and brackish water that cannot be directly drunk or used, which makes the desalination of seawater and brackish water Become the best means to fundamentally solve the world's water crisis. In response to this situation, many desalination technologies have been developed around the world, such as reverse osmosis technology, electrodialysis technology, multi-stage flash evaporation technology, ion exchange technology, etc. Howeve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469C02F1/461
CPCC02F1/46109C02F1/4691C02F2001/46133Y02A20/131
Inventor 李克勋霍思璐
Owner NANKAI UNIV
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