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Asymmetric CDI desalination module and method for desalination by using same

An asymmetric, desalination technology, applied in the field of water treatment, can solve the problems such as the anode cannot effectively adsorb anions, the desalination performance is attenuated, etc., and achieve the effect of good industrial application prospects.

Active Publication Date: 2020-10-02
DONGGUAN UNIV OF TECH
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  • Description
  • Claims
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Problems solved by technology

Some studies have shown that when the CDI module is performing a cycle test, the effect of the applied voltage causes the side reaction of anodic oxidation of the CDI module, resulting in the accumulation of a large number of negatively charged oxygen-containing functional groups on the anode, resulting in the inability of the anode to effectively absorb anions, thereby improving its desalination performance. attenuation

Method used

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  • Asymmetric CDI desalination module and method for desalination by using same
  • Asymmetric CDI desalination module and method for desalination by using same

Examples

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Embodiment 1

[0050] Example 1 Asymmetric CDI module test using modified activated carbon with water-soluble charged polymer binder as electrode material

[0051] (a) 2.5 g of polyvinyl alcohol was added to 47.5 g of deionized water, stirred in a water bath at 90°C for 4 hours to fully dissolve, and a polyvinyl alcohol binder with a mass fraction of 5% was obtained. Add 1.0 g of potassium hydroxide and 3.5 g of 2,3-epoxypropyltrimethylammonium chloride into the uniformly stirred PVA binder, and then stir in a water bath at 70° C. for 4 h. After the reaction, the above mixture was cooled to room temperature, precipitated in absolute ethanol, and washed with absolute ethanol until the pH was neutral to remove excess reactants. Finally, the obtained solid quaternized polyvinyl alcohol was stirred in a water bath at 90° C. for 4 hours to be fully dissolved in deionized water to prepare a quaternized polyvinyl alcohol binder.

[0052] (b) Add 1.0 g of carboxymethyl cellulose to 49.0 g of dilute...

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Abstract

The invention relates to a desalination asymmetric CDI module and a desalination method using the same, and belongs to the technical field of water treatment. The invention discloses a desalination asymmetric CDI module. The module comprises an anode and a cathode; the two electrodes are obtained by drying graphite flakes and slurry coated on the graphite flakes; the slurry is obtained by mixing an electrode material, conductive carbon black and a binder in a solvent; according to the anode, the electrode material is nitric acid treated activated carbon or commercial activated carbon; the binder is quaternized polyvinyl alcohol; according to the cathode, the electrode material is ionic liquid modified activated carbon or commercial activated carbon; and the binder is carboxymethyl cellulose or sulfonated carboxymethyl cellulose. An activated carbon electrode prepared from the water-soluble charged polymer binder provided by the invention does not need an expensive ion exchange membrane, but can achieve a desalination effect similar to that of a membrane capacitive deionization module, so that the activated carbon electrode shows a good industrial application prospect.

Description

technical field [0001] The invention relates to a desalination asymmetric CDI module and a desalination method using the module, belonging to the technical field of water treatment. Background technique [0002] Water is an important part of human life. 71% of the earth's surface area is covered by water, of which 97% is salt water that cannot be used for human production activities, and only 3% is fresh water that is beneficial to human beings. 3% of fresh water, except glaciers, ice caps, deep groundwater and other fresh water that is difficult to use by existing technical means, the fresh water resources that humans can really use are extremely limited, accounting for only 0.26% of the total water on the earth. Converting the earth's abundant seawater and brackish water into freshwater resources through desalination technology has become the most reliable means to solve this problem. [0003] Capacitive deionization (CDI) technology is an emerging desalination technology...

Claims

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Application Information

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IPC IPC(8): C02F1/469
CPCC02F1/4691
Inventor 王刚曾珊珊汪仕勇李长平吕斯濠
Owner DONGGUAN UNIV OF TECH
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