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Cathode flowing electrode liquid, flowing electrode capacitive deionization device and application of flowing electrode capacitive deionization device

A technology of capacitive deionization and flowing electrodes, which is applied in the field of capacitive deionization devices of flowing electrodes and cathode flowing electrode solution, can solve the problem of difficult to ensure stable, long-term and high-efficiency operation of the reactor, low charge transfer efficiency of collectors and flowing electrodes, Improve the regeneration and stable cycle performance, cost-effective, and improve the removal efficiency due to problems such as the increase of the viscosity of the flow electrode

Active Publication Date: 2021-06-18
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the traditional electrode capacitive deionization (CDI) technology, the FCDI technology improves the desalination effect by using the flowing electrode suspension instead of the traditional fixed electrode, but due to the dispersion of active materials suspended in the flowing electrode slurry, there is discontinuous conductivity , would lead to inefficient charge transfer between the current collector and the flowing electrode
Studies have also proved that increasing the carbon content or introducing carbon black can promote electron transport, but it will lead to a corresponding increase in the viscosity of the flow electrode, which may lead to blockage of the electrode channel, so it is difficult to ensure the stable, long-term and efficient operation of the reactor

Method used

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  • Cathode flowing electrode liquid, flowing electrode capacitive deionization device and application of flowing electrode capacitive deionization device
  • Cathode flowing electrode liquid, flowing electrode capacitive deionization device and application of flowing electrode capacitive deionization device
  • Cathode flowing electrode liquid, flowing electrode capacitive deionization device and application of flowing electrode capacitive deionization device

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Embodiment 1

[0034] A cathodic flowing electrode solution, including electrolyte, conductive agent, redox active material and solvent.

[0035] In this embodiment, the concentration of the redox active substance in the cathode flowing electrode solution is 3 mM, and the redox active substance is KI 3 .

[0036] In this embodiment, the concentration of the electrolyte in the cathode flowing electrode solution is 1000 mg / L, and the electrolyte is KCl.

[0037] In this embodiment, the concentration of the conductive agent in the cathode flowing electrode solution is 60 g / L, and the conductive agent is activated carbon and carbon black, and the mass ratio of the two is 5:1.

[0038] In this embodiment, the solvent is water.

[0039] A method for preparing the cathodic flowing electrode solution in the above-mentioned embodiment of the present invention, comprising the following steps:

[0040] (1) Weigh I 2 Dissolve KI in 100mL KCl solution with a concentration of 1000mg / L, mix well, and r...

Embodiment 2

[0044] A flow electrode capacitive deionization device, its structure schematic diagram is as follows figure 1 As shown, it includes an anode flow electrode chamber, a water inlet chamber and a cathode flow electrode chamber, wherein the cathode flow electrode chamber contains the cathode flow electrode solution prepared in Example 1 with different concentrations of redox active substances.

[0045] In this embodiment, an anion exchange membrane is arranged between the anode flow electrode chamber and the water inlet chamber, and a cation exchange membrane is arranged between the cathode flow electrode chamber and the water inlet chamber; A current collector, wherein the current collector is a graphite plate with a serpentine flow channel.

[0046] In this embodiment, the anode flow electrode chamber also contains an anode flow electrode solution, wherein the anode flow electrode solution includes electrolyte, conductive agent and solvent; specifically: the concentration of th...

Embodiment 3

[0050] An application of a flowing electrode capacitive deionization device in water body purification, specifically for utilizing the flowing electrode capacitive deionization device (B0, B1, B2, B3) in embodiment 2 to process potassium chloride solution, comprising the following steps:

[0051] At a flow rate of 25mL / min, 50mL of KCl solution with a concentration of 3000mg / L was pumped into the water inlet chamber through the water inlet pipe and circulated in the water inlet chamber. At the same time, the flow rate of the cathode flow electrode solution in the cathode flow electrode chamber was controlled as 50mL / min, and control the flow rate of the anode flow electrode solution in the anode flow electrode chamber to be 50mL / min, after the conductivity is stable, power on, and control the voltage between the anode flow electrode chamber and the cathode flow electrode chamber to be 1.2V, namely Apply a constant voltage of 1.2V to the mobile electrode capacitive deionization ...

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Abstract

The invention discloses a cathode flowing electrode solution, a flowing electrode capacitive deionization device and application thereof. The cathode flowing electrode solution comprises an electrolyte, a conductive agent, a redox active substance and a solvent. A cathode flowing electrode chamber of the flowing electrode capacitive deionization device contains the cathode flowing electrode liquid. According to the cathode flowing electrode liquid, by adding the redox active substance, the energy consumption can be reduced, the charge efficiency and the removal efficiency can be improved, the regeneration and stable cycle performance can be improved, and the cathode flowing electrode liquid has the advantages of being low in cost, low in energy consumption, high in charge efficiency, good in stable performance and the like, and is a novel cathode flowing electrode liquid with excellent performance; and as a flowing electrode liquid in a cathode flowing electrode chamber, the cathode flowing electrode liquid can remarkably improve the purification effect of the flowing electrode capacitive deionization device on various water bodies; the use value is high; and the application prospect is good.

Description

technical field [0001] The invention belongs to the field of application of flow capacitive deionization technology and water treatment science, and relates to a cathode flow electrode liquid, flow electrode capacitance deionization device and application thereof. Background technique [0002] Water is the source of life. There are abundant water reserves on the earth, with a total of 1.45 billion cubic kilometers. 72% of the surface area is covered by water, but fresh water resources only account for 0.5% of the total water resources, and most of the fresh water is Polar ice, snow, glaciers and groundwater are only 0.01% of the fresh water resources suitable for human use. Nowadays, with the growth of population and the rapid development of economy, the shortage of water resources has become one of the biggest problems faced by human beings in the 21st century, and people began to turn their attention to seawater. Therefore, it is increasingly important to find suitable me...

Claims

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Application Information

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IPC IPC(8): C02F1/469C02F1/42
CPCC02F1/4691C02F1/42C02F2201/46
Inventor 罗琨月唐旺旺曾光明
Owner HUNAN UNIV
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