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A nitrogen, sulfur co-doped porous carbon sheet capacitive desalination electrode material and its preparation and application

A technology of electrode material and porous carbon, which is applied in the field of capacitive desalination electrode material preparation, can solve the problems of limiting the application of capacitive desalination technology and low desalination amount, and achieves simple, clean and controllable preparation process, good desalination effect, and high surface wettability Effect

Active Publication Date: 2021-10-15
JINCHUAN GROUP LIMITED +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, people have used a variety of carbon materials for CDI electrodes and carried out related application research, including: activated carbon, carbon aerogel, carbon nanotubes, mesoporous carbon, graphene, etc., but their performance is not as good as that of commercially used noble metals. Compared with electrodes, the desalination capacity is relatively low, which greatly limits the application of capacitive desalination technology

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  • A nitrogen, sulfur co-doped porous carbon sheet capacitive desalination electrode material and its preparation and application
  • A nitrogen, sulfur co-doped porous carbon sheet capacitive desalination electrode material and its preparation and application
  • A nitrogen, sulfur co-doped porous carbon sheet capacitive desalination electrode material and its preparation and application

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Effect test

Embodiment 1

[0048] Electrode Preparation for Capacitive Desalting

[0049] The mass ratio between the mixture of potassium chloride and lithium chloride, the mixture of lithium nitrate and sodium thiosulfate, and glucose in the mixture is 10:1:1, and the mass ratio of potassium chloride to lithium chloride The mass ratio of lithium nitrate and sodium thiosulfate is 1:4. The stirring time is 30 minutes, the carbonization process is carried out under an inert atmosphere, the heating rate is 5°C / min, the holding temperature is 500°C, and the holding time is 2h. The high-temperature carbonization product is cooled, soaked in water for 10 hours, filtered, and then dried in an oven at 60°C for 24 hours to obtain a nitrogen-sulfur co-doped porous carbon sheet, see figure 1 . Using nitrogen adsorption and desorption, X-ray diffraction and X-ray diffraction photoelectron can analyze the synthesized porous carbon sheet, which proves that it has the characteristics of high specific surface area, ...

Embodiment 2

[0052] 1) Preparation of Capacitive Desalting Electrode

[0053] The mass ratio between the mixture of potassium chloride and lithium chloride, the mixture of lithium nitrate and sodium thiosulfate, and glucose in the mixture is 10:1:1, and the mass ratio of potassium chloride to lithium chloride The mass ratio of lithium nitrate and sodium thiosulfate is 1:4. The stirring time is 30 min, the carbonization process is carried out under an inert atmosphere, the heating rate is 5°C / min, the holding temperature is 600°C, and the holding time is 2h. The high-temperature carbonization product is cooled, soaked in water for 10 hours, filtered, and then dried in an oven at 60°C for 24 hours to obtain a nitrogen-sulfur co-doped porous carbon sheet (named CNSs-600), see figure 2 . The synthesized porous carbon sheet can be analyzed by nitrogen adsorption and desorption, X-ray diffraction and X-ray diffraction photoelectron, which proves that it has the characteristics of high specifi...

Embodiment 3

[0058] 1) Preparation of Capacitive Desalting Electrode

[0059] The mass ratio between the mixture of potassium chloride and lithium chloride, the mixture of lithium nitrate and sodium thiosulfate, and glucose in the mixture is 10:1:1, and the mass ratio of potassium chloride to lithium chloride The mass ratio of lithium nitrate and sodium thiosulfate is 1:4. The stirring time is 30 minutes, the carbonization process is carried out under an inert atmosphere, the heating rate is 5°C / min, the holding temperature is 700°C, and the holding time is 2h. The high-temperature carbonization product is cooled, soaked in water for 6-10 hours, filtered, and then dried in an oven at 60°C for 12-24 hours to obtain nitrogen and sulfur co-doped porous carbon prepared by nitrogen and sulfur co-doped porous carbon sheets Sheet material, carbon black, PVDF according to the mass ratio of 8:1:1 dry grinding for 10 minutes, then wet grinding with 1-methyl-2-pyrrolidone dropwise for 30 minutes, ev...

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Abstract

The invention discloses a nitrogen and sulfur co-doped porous carbon sheet capacitive desalination electrode material, a preparation method and application thereof, and belongs to the field of capacitive desalination electrode preparation. Its preparation method is to firstly grind potassium chloride, lithium chloride, lithium nitrate, sodium thiosulfate and glucose into a paste, then carbonize at high temperature, soak, wash and filter, and dry to obtain lamellar, high-ratio The nitrogen-sulfur co-doped porous carbon of the surface area; the prepared nitrogen, sulfur co-doped porous carbon sheet, carbon black, PVDF and 1-methyl-2-pyrrolidone are mixed evenly and scraped on the conductive glass, and dried That is, a capacitive desalting electrode is obtained. The preparation process is simple and easy, the source of raw materials is wide, and the process is simple. Applied to capacitive desalination of high salt water, the effect is good, and the salt adsorption capacity is high. Under the condition of low voltage of 1.4V, the desalination capacity of 55.79mg / g can be achieved in 330mg / L NaCl solution.

Description

technical field [0001] The invention relates to the technical field of preparation of capacitance desalination electrode materials, in particular to a nitrogen and sulfur co-doped porous carbon sheet capacitance desalination electrode material and its preparation and application. Background technique [0002] The shortage of water resources is gradually becoming one of the main factors restricting the sustainable development strategy of our country. High salt water comes from a wide range of sources, including seawater, brackish water, and high-salt wastewater from chemical, printing and dyeing, and food processing industries. The large volume of water poses a huge challenge to the current water resource utilization and wastewater reuse. Traditional desalination technologies such as electrodialysis, reverse osmosis, and multi-stage flash evaporation generally have problems such as high energy consumption, low efficiency, low water utilization rate, and secondary pollution, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/469C02F103/08
Inventor 杨卫春闵小波胡晓先马玉天张燕张鹏昕雨赵洁
Owner JINCHUAN GROUP LIMITED
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