CN-122010254-A - Capacitive deionization electrode, component, preparation method and water purifying equipment

CN122010254ACN 122010254 ACN122010254 ACN 122010254ACN-122010254-A

Abstract

The application relates to the technical field of water purification, and provides a capacitive deionization electrode, a capacitive deionization assembly, a capacitive deionization preparation method and water purification equipment. The preparation method of the capacitive deionization electrode comprises the steps of mixing an adsorbent, a binder and a conductive agent according to a preset proportion to prepare electrode slurry, coating the electrode slurry on a current collector to form an electrode slurry layer, and carrying out chemical treatment on the electrode slurry layer to form an ion exchange layer on the surface of the electrode slurry layer. According to the preparation method of the capacitive deionization electrode, disclosed by the embodiment of the application, the electrode slurry layer is subjected to chemical treatment to form the ion exchange layer on the surface of the electrode slurry layer, and the active groups on the ion exchange layer on the surface of the electrode can capture or convert target ions more quickly and more efficiently, so that the desalination rate of the water purification equipment can be effectively improved.

Inventors

ZHANG YANHE
HE ZHIZHAO
CHEN WEIZHONG
LI ZHE

Assignees

佛山市美的清湖净水设备有限公司
美的集团股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260331

Claims (11)

1. The preparation method of the capacitor deionized electrode is characterized by comprising the following steps of: mixing an adsorbent, a binder and a conductive agent according to a preset proportion to prepare electrode slurry; Coating electrode slurry on a current collector to form an electrode slurry layer; And carrying out chemical treatment on the electrode slurry layer to form an ion exchange layer on the surface of the electrode slurry layer.
2. The method of claim 1, wherein the chemically treating the electrode slurry layer to form an ion exchange layer on the surface of the electrode slurry layer comprises: Coating the surface of the electrode slurry layer with a chemically treated treatment liquid; and drying the treatment liquid on the surface of the electrode slurry layer.
3. The method for preparing a capacitive deionization electrode according to claim 2, wherein the chemical treatment is a sulfonation treatment, the treatment solution used in the sulfonation treatment is sulfuric acid solution or ammonium sulfate solution, the concentration is 0.1% to 70%, the treatment temperature is 50 ℃ to 95 ℃, and the treatment time is 0.5 hours to 3 hours.
4. The method according to claim 2, wherein the chemical treatment is an amination treatment, the treatment liquid used in the amination treatment is ammonia water or a polyethylene polyamine solution or an ethylenediamine solution, the concentration of the ammonia water is 0.1-28%, the concentration of the polyethylene polyamine or ethylenediamine solution is not less than 90%, the treatment temperature is 20-150 ℃, the treatment pressure is 0.1-0.5 Mpa, and the treatment time is 0.5-3 hours.
5. The method of preparing a capacitive deionization electrode as claimed in claim 1, comprising: cleaning the electrode slurry layer after chemical treatment; Detecting whether a target active group exists on the surface of the electrode slurry layer; if the target active group exists, determining that the ion exchange layer is finished; And if the target active group does not exist, re-executing the step of carrying out chemical treatment on the electrode slurry layer to form an ion exchange layer on the surface of the electrode slurry layer.
6. The method for preparing a capacitive deionization electrode according to claim 5, wherein said detecting whether a target active group exists on the surface of the electrode slurry layer comprises: detecting the electrode slurry layer after cleaning by an infrared spectrum detector; If a characteristic absorption peak corresponding to the chemical bond of the target reactive group is observed in the infrared spectrum, the target reactive group is present; if the characteristic absorption peak is not observed in the infrared spectrum, the target reactive group is not present.
7. The method of claim 1, wherein the ratio of the thicknesses of the ion exchange layer and the electrode slurry layer is 1:5 to 1:3, the thickness of the electrode slurry layer is 50 μm to 240 μm, and the thickness of the ion exchange layer is 10 μm to 80 μm.
8. The method of any one of claims 1 to 7, wherein the applying the electrode paste to the current collector to form the electrode paste layer comprises: coating electrode slurry on a first end face of a current collector to form a first electrode slurry layer, and coating electrode slurry on a second end face of the current collector to form a second electrode slurry layer; The chemically treating the electrode slurry layer to form an ion exchange layer on the surface of the electrode slurry layer includes: performing chemical treatment on the first electrode slurry layer to form a first ion exchange layer on the surface of the first electrode slurry layer; And carrying out chemical treatment on the second electrode slurry layer to form a second ion exchange layer on the surface of the second electrode slurry layer, wherein the ion selectivity of the first ion exchange layer and the ion selectivity of the second ion exchange layer are the same or opposite.
9. A capacitive deionization electrode prepared by the method of any one of claims 1 to 7, comprising: A current collector; the electrode slurry layer comprises an adsorption layer and an ion exchange layer, wherein the adsorption layer is arranged on the surface of the current collector, the ion exchange layer is arranged on the surface of the adsorption layer, the ion exchange layer comprises active groups, and the active groups have ion exchange functions.
10. A capacitive deionization electrode assembly, comprising: A first electrode; A second electrode disposed opposite to the first electrode; at least one of the first electrode and the second electrode is the capacitive deionization electrode of claim 9.
11. A water purification apparatus, comprising: A cartridge assembly comprising the capacitive deionization electrode of claim 9.

Description

Capacitive deionization electrode, component, preparation method and water purifying equipment Technical Field The invention relates to the technical field of water purification, in particular to a capacitive deionization electrode, a capacitive deionization assembly, a capacitive deionization preparation method and water purification equipment. Background With the development of technology, people have increasingly demanded water quality, and the existing water purification scheme generally adopts an ion exchange membrane to treat ions of water, such as electrodialysis technology and membrane capacitance deionization technology. The ion exchange membrane has higher cost and is easy to grow bacteria after long-time work, and is unfavorable for common users to use in families. On the basis, the existing capacitor deionization electrode without the ion exchange membrane solves the problem of bacterial breeding, but the deionization efficiency of the capacitor deionization electrode cannot meet the requirement of a user family on mineral water and purified water. Therefore, the capacitive deionization electrode with high adsorption capacity is developed, the desalination rate of the device is improved, and the capacitive deionization technology can be effectively promoted to be applied and popularized in families of common users. Disclosure of Invention The present application is directed to solving at least one of the technical problems existing in the related art. Therefore, the preparation method of the capacitive deionization electrode provided by the application can form an ion exchange layer on the surface of the electrode slurry layer by carrying out chemical treatment on the electrode slurry layer, and active groups on the ion exchange layer on the surface of the electrode can capture or convert target ions more quickly and more efficiently, so that the desalination rate of the water purifying equipment can be effectively improved. The application also provides a capacitive deionization electrode. The application also provides a capacitive deionization electrode assembly. The application also provides water purifying equipment. According to the preparation method of the capacitive deionization electrode provided by the embodiment of the first aspect of the application, the preparation method comprises the following steps: mixing an adsorbent, a binder and a conductive agent according to a preset proportion to prepare electrode slurry; Coating electrode slurry on a current collector to form an electrode slurry layer; And carrying out chemical treatment on the electrode slurry layer to form an ion exchange layer on the surface of the electrode slurry layer. According to the preparation method of the capacitive deionization electrode, the electrode slurry layer is subjected to chemical treatment, so that an ion exchange layer can be formed on the surface of the electrode slurry layer, active groups on the ion exchange layer on the surface of the electrode can capture or convert target ions more quickly and more efficiently, and the desalination rate of the water purifying equipment can be effectively improved. In addition, the active groups of the ion exchange layer are mainly distributed in the ion exchange layer, so that the occupation of an adsorption layer of the electrode slurry layer is reduced, and the physical adsorption capacity of the electrode slurry can be maintained to the greatest extent, thereby taking into account the dual effects of adsorption and promotion of ion screening. According to one embodiment of the present application, the chemically treating the electrode slurry layer to form an ion exchange layer on the surface of the electrode slurry layer includes: Coating the surface of the electrode slurry layer with a chemically treated treatment liquid; and drying the treatment liquid on the surface of the electrode slurry layer. According to one embodiment of the application, the chemical treatment is sulfonation, the treatment liquid used in the sulfonation is sulfuric acid solution or ammonium sulfate solution, the concentration is 0.1-70%, the treatment temperature is 50-95 ℃, and the treatment time is 0.5-3 hours. According to one embodiment of the application, the chemical treatment is an amination treatment, the treatment liquid used in the amination treatment is ammonia water or polyethylene polyamine solution or ethylenediamine solution, the concentration of ammonia water is 0.1-28%, the concentration of polyethylene polyamine is not lower than 90%, the treatment temperature is 20-150 ℃, the treatment pressure is 0.1-0.5 Mpa, and the treatment time is 0.5-3 hours. According to one embodiment of the application, it comprises: cleaning the electrode slurry layer after chemical treatment; Detecting whether a target active group exists on the surface of the electrode slurry layer; if the target active group exists, determining that the ion exchange layer is finished; And if the tar