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Cathode flow electrode solution, flow electrode capacitive deionization device and its application

A capacitive deionization, flow electrode technology, applied in ion exchange water/sewage treatment, separation methods, dispersed particle separation, etc., can solve the problem of difficulty in ensuring stable, long-term, efficient operation of the reactor, and charge transfer between current collectors and flow electrodes. Low efficiency, increased viscosity of flow electrode, etc., to achieve the effect of improving regeneration and stable cycle performance, high cost performance, and improved removal efficiency

Active Publication Date: 2022-06-21
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 flow electrode solution, flow electrode capacitive deionization device and its application
  • Cathode flow electrode solution, flow electrode capacitive deionization device and its application
  • Cathode flow electrode solution, flow electrode capacitive deionization device and its application

Examples

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Embodiment 1

[0034] A cathode flowing electrode solution includes 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 cathode flowing electrode solution in the above embodiment of the present invention, comprising the following steps:

[0040] (1) Weigh I 2 and KI dissolved in 100mL of KCl solution with a concentration of 1000mg / L, mixed evenly, and rea...

Embodiment 2

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

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

[0046] In this embodiment, the anode flowing electrode chamber also contains an anode flowing electrode s...

Embodiment 3

[0050] An application of a flowing electrode capacitance deionization device in water purification, specifically utilizing the flowing electrode capacitance deionization device (B0, B1, B2, B3) in Example 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 flowing electrode solution in the cathode flowing electrode chamber was controlled as 50mL / min, and control the flow rate of the anode flowing electrode solution in the anode flowing electrode chamber to be 50mL / min, after the conductivity is stable, turn on the electricity, and control the voltage between the anode flowing electrode chamber and the cathode flowing electrode chamber to be 1.2V, that is, Apply a constant voltage of 1.2V to the flow electrode c...

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Abstract

The invention discloses a cathode flow electrode solution, a flow electrode capacitive deionization device and applications thereof. The cathode flow electrode solution includes an electrolyte, a conductive agent, a redox active substance and a solvent. The cathode flow electrode chamber of the flow electrode capacitive deionization device contains the above cathode flow electrode solution. The cathodic flowing electrode solution of the present invention can reduce energy consumption, improve charge efficiency and removal efficiency, and improve regeneration and stable cycle performance by adding redox active substances, and has low cost, low energy consumption, high charge efficiency and stable performance. Good and other advantages, it is a new type of cathodic mobile electrode solution with excellent performance, and as the mobile electrode solution in the cathode mobile electrode chamber, it can significantly improve the purification effect of the mobile electrode capacitive deionization device on various water bodies, and has high use value and application Good prospects.

Description

technical field [0001] The invention belongs to the field of flow capacitance deionization technology application and water treatment science, and relates to a cathode flow electrode solution, a flow electrode capacitance deionization device and applications thereof. Background technique [0002] Water is the source of life. The earth is rich in water storage, with a total of 1.45 billion cubic kilometers. 72% of the surface area is covered by water, but freshwater resources only account for 0.5% of the total water resources, and most of the freshwater is The polar ice and snow glaciers and groundwater are only 0.01% of the freshwater resources suitable for human use. Nowadays, with the growth of population and the rapid development of economy, water shortage has become one of the biggest problems faced by mankind in the 21st century, and people have begun to turn their attention to sea water. Therefore, it is increasingly important to find suitable methods to treat seawate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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