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Method for achieving ultra-low energy consumption continuous desalting through mixed fluid electrode material

An electrode material and mixed fluid technology, applied in the field of electrochemical desalination, can solve the problems of high performance requirements of electrode materials, high desalination rate, easy to be polluted, etc., and achieve good application value, high desalination efficiency and good stability. Effect

Pending Publication Date: 2019-12-10
SOUTH CHINA NORMAL UNIVERSITY
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  • Abstract
  • Description
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Problems solved by technology

[0003] Thermal evaporation, as the earliest seawater desalination method, has the characteristics of simple operation and low equipment requirements, but a large amount of heat needs to be provided during the evaporation process, resulting in high energy consumption; reverse osmosis is a commonly used desalination method at present. The salt method has a high desalination rate and relatively low cost, but the separation membrane used has high requirements on water quality and is easily polluted; the electrodialysis method uses an electric field to drive the directional migration of anions and cations to achieve desalination, but it cannot be used at the positive and negative electrodes. Avoid the side reactions of hydrogen evolution and oxygen absorption, which will affect the desalination efficiency and the cost is high; capacitive deionization technology, as a desalination technology that has rapidly emerged in recent years, uses the Faraday process of carbon materials to achieve effective adsorption of salt in seawater , but the desalination capacity is relatively limited, and the performance requirements for electrode materials are relatively high
[0004] In summary, although these methods are mature, they inevitably face the problems of high energy consumption, high cost and low capacity.

Method used

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  • Method for achieving ultra-low energy consumption continuous desalting through mixed fluid electrode material
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  • Method for achieving ultra-low energy consumption continuous desalting through mixed fluid electrode material

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Effect test

Embodiment 1

[0045] A method of using mixed fluid electrode materials to achieve continuous desalination with ultra-low energy consumption:

[0046] 1) Cut the graphite paper and anion and cation exchange membranes into a size of 11cm×11cm (consistent with the size of the device mold), and punch a number of holes with a diameter of 1cm on it, so that the screws used to fix the device and the saline solution can smoothly Passed; before assembling the flow battery, the anion and cation exchange membranes were rinsed several times with deionized water, and soaked in deionized water respectively; the graphite paper was ultrasonically cleaned with acetone, alcohol, and deionized water for 10 minutes, and the ultrasonic frequency was 100W. After cleaning, put it in an oven and dry it for use; the screws and joints of the assembled mold are tightly wrapped with raw material tape to prevent water leakage and short circuit;

[0047] 2) Assemble the mold according to the first assembly method, and t...

Embodiment 2

[0054] A method of using mixed fluid electrode materials to achieve continuous desalination with ultra-low energy consumption:

[0055] 1) with the step 1) of embodiment 1);

[0056] 2) The mold is assembled according to the second assembly mode, and all the other steps are the same as step 2) of embodiment 1, such as figure 2 Shown is the schematic diagram of the desalination corresponding to the second assembly method;

[0057] 3) Weigh 0.6g NaCl into a 100mL volumetric flask, add deionized water to the scale line of the volumetric flask to obtain a 6g / L NaCl solution; use a graduated cylinder to measure 25mL of the prepared NaCl solution into a beaker as a flow battery saline solution;

[0058] 4) Weigh 0.2112g of potassium ferrocyanide and 0.1646g of potassium ferricyanide into a 100mL beaker, add 50mL of the NaCl solution prepared in step 3) to obtain a mixed fluid electrode material solution with a concentration of 10mM / 10mM; prepare A good mixed fluid electrode mate...

Embodiment 3

[0062] A method of using mixed fluid electrode materials to achieve continuous desalination with ultra-low energy consumption:

[0063] 1) with the step 1) of embodiment 1);

[0064] 2) assemble the mold according to the third assembly mode, and the remaining steps are the same as step 2 of embodiment 1);

[0065] 3) Weigh 1.0g NaCl into a 100mL volumetric flask, add deionized water to the scale line of the volumetric flask to obtain a 10g / L NaCl solution; use a graduated cylinder to measure 25mL of the prepared NaCl solution into a beaker as a flow battery saline solution;

[0066] 4) Weigh 0.4224g of potassium ferrocyanide and 0.3292g of potassium ferricyanide into a 100mL beaker, add 50mL of the NaCl solution prepared in step 3) to obtain a mixed fluid electrode material solution with a concentration of 20mM / 20mM; prepare A good mixed fluid electrode material solution is continuously fed with nitrogen to remove dissolved oxygen in water;

[0067] 5) Before starting the d...

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Abstract

The invention belongs to the technical field of electrochemical desalting, and provides a method for achieving ultra-low energy consumption continuous desalting through a mixed fluid electrode material. Desalting is achieved through a desalting fluid battery device, the positive pole and the negative pole of the battery device are both mixed fluid electrode material solutions, the mixed fluid electrode material is formed by a fluid electrode material with the oxidation characteristic and a fluid electrode material with the reduction characteristic in a mixed mode, and the two fluid electrode materials belong to the same redox couple or redox couples located in adjacent potentials. The total amount of active substances in the process of electron gain and loss of active materials on the twosides of the positive pole and the negative pole of the battery device is not changed, and zwitterions in the salt solutions directionally migrate under the effect of an electric field to achieve continuous desalting; the desalting method achieves ultra-low energy consumption desalting, the desalting efficiency is high, and no side reaction occurs; and compared with other desalting modes, operation is easier, the cost is low, environmental protection is achieved, stability is good, and the method has very good application value in the aspect of sea water desalination.

Description

technical field [0001] The invention belongs to the technical field of electrochemical desalination, and in particular relates to a method for realizing ultra-low energy consumption continuous desalination by using a mixed fluid electrode material. Background technique [0002] Entering the 21st century, with the continuous increase of the world's population and the continuous development of the economy and society, people's demand for fresh water resources is also increasing, especially for the Middle East, Africa and some inland desert areas. The main ways to solve the crisis of fresh water resources include seawater desalination and effective treatment and recycling of sewage. At present, relatively mature technologies include thermal evaporation, reverse osmosis, electrodialysis, and capacitive deionization. [0003] Thermal evaporation, as the earliest seawater desalination method, has the characteristics of simple operation and low equipment requirements, but a large ...

Claims

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Application Information

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IPC IPC(8): C02F1/46C02F1/461C02F1/467C02F1/469C02F101/20C02F103/08
CPCC02F1/46C02F1/46109C02F1/467C02F1/4693C02F2001/46133C02F2101/20C02F2103/08
Inventor 陈福明王健
Owner SOUTH CHINA NORMAL UNIVERSITY
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