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Capacitive deionization electrode and preparation method thereof

A desalination and capacitance technology, applied in the field of bitter-alkali water desalination, can solve the problems of low effective surface area, complex pore structure, poor desalination efficiency, etc., and achieve the effect of improving desalination efficiency and charge efficiency.

Active Publication Date: 2018-07-10
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the symmetric capacitive deionization method using carbon-based electrodes has disadvantages such as complex pore structure, low effective surface area, double layer overlapping effect, poor desalination efficiency and low charge efficiency, and the desalination rate that can be achieved by electrostatic adsorption is <20mg / g, and Charge efficiency is usually around 60%

Method used

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  • Capacitive deionization electrode and preparation method thereof
  • Capacitive deionization electrode and preparation method thereof
  • Capacitive deionization electrode and preparation method thereof

Examples

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Effect test

Embodiment 1

[0048] Use Na x M y O z As a negative electrode for capacitive desalination, where M is Ti or Mn or Co. Materials that can react with chloride ions are positive electrodes, such as materials such as carbon, Prussian blue, silver, and bismuth oxychloride, which constitute a dual-ion deintercalation electrode.

[0049] Na x M y O z The preparation process includes the following steps:

[0050] (1) Mixing: TiO 2 , NaOH is fully stirred until the mixture is uniform to obtain a mixture.

[0051] (2) Reaction: the obtained mixture is moved to a polytetrafluoroethylene-lined high-pressure reactor, put into a thermostat, and subjected to a hydrothermal reaction at 150-230° C. for 0.5-4 hours to obtain a reaction product.

[0052] (3) Drying: the reaction product is washed to neutrality, and then transferred to a constant temperature oven for drying at 50-90° C. for at least 2 hours to obtain Na x M y O z .

Embodiment 2

[0054] Use Na 4 Ti 9 O 20 As a negative electrode for capacitive desalination, where M is Ti or Mn or Co. Materials that can react with chloride ions are positive electrodes, such as materials such as carbon, Prussian blue, silver, and bismuth oxychloride, which constitute a dual-ion deintercalation electrode.

[0055] Na 4 Ti 9 O 20 The preparation process includes the following steps:

[0056] (1) Mixing: 0.3g TiO 2 , 50ml of 10mol / L NaOH is fully stirred until the mixture is uniform, and stirred for about 30 minutes to obtain a mixture.

[0057] (2) Reaction: The obtained mixture was moved to a polytetrafluoroethylene-lined autoclave, put into a thermostatic oven, and subjected to a hydrothermal reaction at 200° C. for 4 hours to obtain a reaction product.

[0058] (3) Drying: The reaction product was washed to neutrality, that is, pH=7, and then transferred to a constant temperature oven for drying at 70° C. for 12 hours to obtain Na nanotube-like structures. 4 Ti...

Embodiment 3

[0060] Use Na x M y O z The composite with graphene is used as the negative electrode for capacitive desalination, where M is Ti or Mn or Co. Materials that can react with chloride ions are positive electrodes, such as materials such as carbon, Prussian blue, silver, and bismuth oxychloride, which constitute a dual-ion deintercalation electrode.

[0061] Na x M y O z The preparation process of the composite with graphene includes the following steps:

[0062] (1) Mixing: TiO 2 , NaOH and graphene oxide are fully stirred until the mixture is uniform to obtain a mixture.

[0063] (2) Reaction: The obtained mixture is moved to a polytetrafluoroethylene-lined high-pressure reactor, put into a thermostat, and subjected to a hydrothermal reaction at 150-230° C. for 0.5-24 hours to obtain a reaction product.

[0064] (3) Drying: the reaction product is washed to neutrality, and then transferred to a constant temperature oven for drying at 50-90° C. for at least 2 hours to obt...

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Abstract

The invention provides a capacitive deionization electrode and a preparation method thereof. A double-ion de-intercalation electrode is prepared from NaxTiyOz, NaxMnyOz, NaxCoyOz and compounds thereof, which are taken as intercalation type capacitive deionization cathodes, and materials (such as carbon, prussian blue, silver and bismuth oxychloride), which are capable of reacting with chloride ions and are taken as anodes, so as to enable sodions and chloridions in bitter alkaline water / heavy salt water to be embedded in corresponding electrodes in a chemical bond manner to achieve the purposeof efficient deionization. Compared with an electrostatic adsorption capacitive deionization method, the capacitive deionization method provided by the invention has the advantages that since ions are removed in a bonding manner, the deionization efficiency and the charge efficiency can be improved greatly, and negative effects existing in electrostatic adsorption capacitive deionization can be inhibited well, such as a double electric layer shielding effect and a co-ion effect.

Description

technical field [0001] The invention relates to the technical field of bitter-alkali water desalination, in particular to a capacitive desalination electrode and a preparation method thereof. Background technique [0002] Capacitive desalination (also known as capacitive deionization) is a saltwater desalination technology based on the electric double layer capacitance model. The electrode moves and adsorbs on the electrode surface to form an electric double layer, so as to achieve the purpose of desalination or removal of ions. At present, the common capacitive desalination electrode materials are mainly composed of carbon and its composite materials with high inertness, large specific surface area and easy mass production, including: activated carbon powder, carbon aerogel, carbon nanotube, graphene, etc. However, the symmetric capacitive deionization method using carbon-based electrodes has disadvantages such as complex pore structure, low effective surface area, overlap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469
CPCC02F1/46109C02F1/4691C02F2001/46133
Inventor 李海波岳智帅
Owner NINGXIA UNIVERSITY
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