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Preparation method and application of sodium vanadyl fluorophosphate/graphene composite electrode material

The technology of sodium vanadyl fluorophosphate and sodium vanadyl phosphate is applied in the field of high energy electrochemistry, which can solve the problems of common ion efficiency affecting charge efficiency, adsorption capacity effect, electrode oxidation, etc., achieving no secondary pollution and high adsorption rate. , the effect of large adsorption capacity

Inactive Publication Date: 2020-10-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, traditional carbon-based electrodes often have problems such as long-term cycle prone to electrode oxidation, adsorption capacity is affected by the specific surface area of ​​the material, and common ion efficiency affects charge efficiency. Therefore, new electrode materials are urgently needed for the desalination process.

Method used

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  • Preparation method and application of sodium vanadyl fluorophosphate/graphene composite electrode material
  • Preparation method and application of sodium vanadyl fluorophosphate/graphene composite electrode material
  • Preparation method and application of sodium vanadyl fluorophosphate/graphene composite electrode material

Examples

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Embodiment 1

[0045] Preparation of sodium vanadyl fluorophosphate / graphene composite:

[0046] (1) Dissolve 1g of graphite oxide in a neutral aqueous solution, and move it into a 250ml volumetric flask, and form a uniform aqueous solution of graphene oxide by stirring and ultrasonication for 300min, wherein the concentration of graphene oxide is 4g L -1 ;

[0047] (2) Weigh ammonium dihydrogen phosphate, ammonium vanadate, sodium carbonate, and sodium fluoride to be 0.46g, 0.468g, 0.212g,

[0048]0.084g added to 8mL concentration is 4g L -1 A stable solution A is formed in the graphene solution;

[0049] (3) Put the solution A obtained in step (2) on a magnetic stirrer, add 40 mL of N,N-dimethylformamide dropwise, adjust the pH to 7 with nitric acid, transfer it to a hydrothermal kettle, and After heating for 10 hours, the obtained product was washed with deionized water and ethanol, and dried in a vacuum oven to obtain a black powder that was sodium fluorovanadyl phosphate / graphene com...

Embodiment 2

[0054] This example adopts the application of the sodium vanadyl fluorophosphate / graphene composite material prepared in Example 1 in the hybrid capacitive deionization technology.

[0055] Preparation of sodium vanadyl fluorophosphate / graphene electrode and activated carbon electrode:

[0056] Based on the sodium vanadyl fluorophosphate / graphene composite material prepared in Example 1, the sodium vanadyl fluorophosphate / graphene composite material and activated carbon were mixed with PVDF and acetylene black according to the mass ratio of 8:1:1, respectively. Stir the NMP for about 6 hours to obtain a uniformly mixed slurry, apply the slurry on the graphite paper collector, and dry it in vacuum at 60°C to obtain amorphous carbon-coated sodium vanadium phosphate electrodes and activated carbon electrodes.

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Abstract

The invention discloses a preparation method and application of a sodium vanadyl fluorophosphate / graphene composite electrode material. The method is based on the principle that a Faraday capacitor and an electric double-layer capacitor store charges. In a capacitive deionization device, under the condition of a certain voltage, one pole takes a sodium vanadium oxyfluorophosphate / graphene compoundelectrode as a Faraday capacitor to adsorb sodium ions, and the other pole takes activated carbon as an electric double-layer capacitor to adsorb chloride ions, so that sodium chloride is removed, and the purpose of desalination is achieved. Chlorine ions and sodium ions can be cyclically adsorbed and desorbed by the material by controlling the magnitude of applied voltage and adjusting the positive electrode and the negative electrode; the method is simple in operation and is free of secondary pollution and assistance of other chemical substances. The adsorption capacity of the hybrid capacitive deionization device composed of the sodium vanadium oxyfluorophosphate / graphene composite material and the activated carbon electrode to sodium chloride can reach 175.94 mg / g, and the hybrid capacitive deionization device has low energy consumption of 0.35 kWh / kg / NaCl<-1>. The application is a desalination method with great prospects.

Description

technical field [0001] The invention belongs to the technical field of high-energy electrochemistry, and relates to the preparation of a sodium vanadyl fluorophosphate / graphene composite electrode material and its application in hybrid capacitive deionization technology. Background technique [0002] With the rapid increase of the world's population and the gradual intensification of environmental pollution, human beings are facing a severe crisis of drinking water safety. In addition, my country is also facing more and more serious water shortage problems. According to relevant data, my country's per capita fresh water possession is only 2,200 cubic meters, ranking 121st in the world, less than one-third of the world's per capita water resources, and one of the 13 countries with the most scarce per capita water resources in the world. However, my country's water consumption has maintained a high level for a long time, and water pollution has increased the proportion of bra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/455C01B32/192C02F1/469B82Y30/00B82Y40/00
CPCC01B25/455C01B32/192B82Y30/00B82Y40/00C02F1/4691C01P2004/62C01P2004/64C01P2004/03C01P2004/04C01P2006/40C01P2004/80
Inventor 马杰程钰娟
Owner TONGJI UNIV
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