Ion Removal Devices Based on Electrochemistry and Photo-electrochemistry, and Preparation Method and Application

Abstract

An ion removal device based on electrochemical and photoelectrochemical methods, and the application of energy conversion and storage are provided. In the ion removal process based on the electrochemical and photoelectrochemical fluidization battery device, the positive active material in the flow battery is the positive pole of device, the negative active material in the fluid battery is the negative pole of the device, and the salt solution is the electrolyte in the middle stream. The positive and negative active materials include organic materials such as 4-hydroxy-piperidinol oxide, riboflavin sodium phosphate or methyl viologen, which have the advantages of low raw material cost, environmental friendliness, high sustainability, excellent electrochemical performance, high specific capacity and good cycle stability etc. The electrolyte can be separated from the positive and negative active liquid flow materials according to the fixed sequence of self-assembly of fluid battery mold.

Claims

1. A method for a desalination using a flow battery, wherein the desalination is performed by a flow desalination battery device; wherein, the flow desalination battery device uses a positive electrode active material as a positive electrode of the flow battery, and a negative electrode active material as a negative electrode of the flow battery, a salt solution is an intermediate flow electrolyte of the flow battery.

2. The method for the desalination using the flow battery according to claim 1, wherein the positive electrode active material is an organic material, an inorganic material, an organic solution or an inorganic solution; wherein the organic material is 4-hydroxy-piperidinol oxide, riboflavin sodium phosphate or methyl viologen; the inorganic material is VCl.sub.3 or NaI; the inorganic solution is a solution containing Br.sub.2/Br.sup.−, VO.sup.2+/VO.sup.2+, V.sup.3+/VO.sup.2+, Fe.sup.3+/Fe.sup.2+, Ce.sup.3+/Ce.sup.4+, Ti.sup.3+/Ti.sup.4+, or Ce.sup.3+/Ce.sup.2+.

3. The method for the desalination using the flow battery according to claim 1, wherein the negative active material is an organic material, an inorganic material, an organic solution or an inorganic solution; the inorganic material is VCl.sub.3, NaI, Zn or Pb; the inorganic solution is a solution containing V.sup.3+/V.sup.2+, Cr.sup.3+/Cr.sup.2+, Cu.sup.2+/Cu.sup.+, TiOH.sup.3+/Ti.sup.3+, Cr.sup.3+/Cr.sup.2+, S/S.sup.2−, Ti.sup.3+/Ti.sup.2+, Mn.sup.2+/Mn.sup.3+, or I.sup.3−/I.sup.−.

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5. The method for the desalination using the flow battery according to claim 1, wherein the flow desalination battery device further comprises an anion exchange membrane and a cation exchange membrane; wherein the anion exchange membrane comprises an amino or quaternary amine-based ion exchange membrane, a chloride ion exchange membrane, a fluoride ion exchange membrane, a sulfate ion exchange membrane, or a nitrate ion exchange membrane; the cation exchange membrane is an ion exchange membrane containing carboxyl or sulfonic acid group a sodium ion exchange membrane, a lithium ion exchange membrane, a potassium ion exchange membrane, a calcium ion exchange membrane, or a magnesium ion exchange membrane.

6. The method for the desalination using tag flow battery according to claim 1, wherein the flow desalination battery device is prepared by the following method: (1) dissolving an inorganic salt in a solvent and stirring evenly to obtain a salt solution; (2) dissolving the positive electrode active material into the salt solution obtained in step (1) to obtain the positive electrode material electrolyte; (3) dissolving the negative electrode active material into the salt solution obtained in step (1) to obtain a negative electrode material electrolyte; (4) assembling a flow battery device in a fixed sequence of a self-assembly of a flow battery device mold, specifically comprising: using the salt solution obtained in step (1) as the intermediate flow electrolyte, the positive electrode material electrolyte obtained in step (2), the negative electrode material electrolyte obtained in step (3), a carbon paper, an anion exchange membrane, and a cation exchange membrane to assemble into the flow desalination battery device.

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19. A method for a continuous low-energy desalination using a redox reaction of a flow battery, wherein a desalination is performed by a flow desalination battery device; wherein, the flow desalination battery device uses positive and negative electrode active flow materials as positive and negative electrodes of the flow battery, and uses a salt solution as the electrolyte of the flow battery; the positive and negative electrode active flow materials comprise one or more than one selected from the group consisting of an Ag/AgCl mixed solution, a Na.sub.0.44MnO.sub.2 mixed solution, Bi/BiOCl, Sb/SbOCl, K.sub.0.27MnO.sub.2, Na.sub.2FeP.sub.2O.sub.7, V.sub.2O.sub.5, Na.sub.3V.sub.2(PO.sub.4).sub.3, Na.sub.2V.sub.6O.sub.16, NaTi.sub.2(PO.sub.4).sub.3, polytetrafluoroethylene, polybutyl acrylate, Na.sub.2C.sub.8H.sub.4O.sub.4, polyvinyl alcohol, Na.sub.0.44[Mn.sub.1-xTi.sub.x]O.sub.2, BiF.sub.3, Pb, PbF.sub.2, piperidine inorganics and bipyridinium salts.

20. The method for the continuous low-energy desalination using the redox reaction of the flow battery according to claim 19, wherein the positive and negative electrode active flow materials further comprise more than one selected from the group consisting of polyamide, prussian blue Fe.sub.4[Fe(CN).sub.6].sub.3 and manganese oxide.

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25. The method for the low-energy desalination using the redox reaction of the flow battery according to claim 19, wherein the Ag/AgCl mixed solution is prepared by the following method: adding Ag particles, AgCl particles and activated carbon into deionized water, and then ball milling to obtain the Ag/AgCl mixed solution; wherein conditions of the ball milling are: 2000-3000 r ball milling for 5-10 h.

26. The method for the continuous low-energy desalination using the redox reaction of the flow battery according to claim 25, wherein the Ag particles are prepared by the following method: (1) adding carboxylated carbon nanotubes to deionized water, and ultrasonically dispersing uniformly to obtain a first mixed solution; (2) adding AgNO.sub.3 to the first mixed solution of step (1), stirring to be evenly mixed, and obtain a second mixed solution; (3) adding a NaBH.sub.4 solution dropwise to the second mixed solution of step (2), and continuing to stir after a dropwise addition to be evenly mixed, then centrifuging and rinsing to obtain the Ag particles; the AgCl particles are prepared by the following method: (I) adding carboxylated carbon nanotubes to deionized water, and ultrasonically dispersing uniformly to obtain a third mixed solution; (II) adding AgNO.sub.3 to the third mixed solution of step (I), stirring to be evenly mixed, and obtain a fourth mixed solution; (III) adding a NaCl solution dropwise to the fourth mixed solution of step (II), and continuing to stir after a dropwise addition to be evenly mixed, then, centrifuging and rinsing to obtain the AgCl particles.

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39. A method for a continuous desalination by a light-driven electrochemical catalysis, wherein a conductive glass with a photosensitive semiconductor material is configured as a photoelectrochemical catalysis device, and under light conditions, photoelectrons are generated to drive a desalination reaction, continuously desalinating by means of an ion exchange.

40. The method for the continuous desalination by the light-driven electrochemical catalysis according to claim 39, wherein the photosensitive semiconductor material comprises one selected from the group consisting of dye semiconductors, quantum dot semiconductors, elemental semiconductors, inorganic compound semiconductors, organic compound semiconductors, amorphous semiconductors, and liquid semiconductors.

41. The method for the continuous desalination by the light-driven electrochemical catalysis according to claim 39, wherein positive and negative active materials of a battery comprise one or more than one selected from the group consisting of TEMPO, carbon nanotube-TEMPO, graphene-TEMPO, graphene oxide-TEMPO, polymer-TEMPO, methyl viologen dichloride hydrate, riboflavin-5′-phosphate sodium salt dehydrate, an Ag/AgCl solution, LiCoO.sub.2, LiMn.sub.2O.sub.4, Bi/BiOCl, Sb/SbOCl, LiMn.sub.2O.sub.4/NaTi.sub.2(PO.sub.4).sub.3, Zn/VS.sub.2, K.sub.0.27 MnO.sub.2, Na.sub.2FeP.sub.2O.sub.7, V.sub.2O.sub.5, Na.sub.3V.sub.2(PO.sub.4).sub.3, Na.sub.2V.sub.6O.sub.16, Na.sub.0.44MnO.sub.2, NaTi.sub.2(PO.sub.4).sub.3, PTFE, PBA, Na.sub.2CH.sub.4O.sub.4, PVA, Na.sub.0.44[Mn.sub.1-xTi.sub.x]O.sub.2, Bi, BiF.sub.3, Pb, PbF.sub.2, piperidine inorganic substances, and bipyridinium salts.

42. The method for the continuous desalination by the light-driven electrochemical catalysis according to claim 41, wherein the positive and negative active materials of the battery further comprise one or more than one of polyamide, manganese oxide, and prussian blue Fe.sub.4[Fe(CN).sub.6].sub.3.

43. The method for the continuous desalination by the light-driven electrochemical catalysis according to claim 41, wherein the piperidine inorganic substances comprise 2-hydroxypyrimidine; the bipyridinium salts comprise 4′-dipyridinium dichloride.

44. The method for the continuous desalination by the light-driven electrochemical catalysis according to claim 39, wherein the photosensitive semiconductor material further comprises a two-dimensional semiconductor material, and the two-dimensional semiconductor material comprises MoS.sub.2, and MoSe.sub.2.

45. The method for the continuous desalination by light-driven electrochemical catalysis according to claim 39, wherein a photosensitive semiconductor is one of a solid phase, a liquid phase or a solution phase; materials of the liquid phase or the solution phase comprise one or more than one selected from the group consisting of azure C, thionine, azure A, azure B, and methylene blue.

46. The method for the continuous desalination by the light-driven electrochemical catalysis according to claim 39, wherein the conductive glass is configured as a light window and comprises ITO or FTO; dense layer semiconductor materials is coated on a surface of the conductive glass, dense layer semiconductors comprise TiO.sub.2, ZnO, SrTiO.sub.3, Co.sub.3O.sub.4, CuO, ZnS, SiC, Cu.sub.2O, BaTiO.sub.3, Bi.sub.2O.sub.3, Sb.sub.2S.sub.3, ZnSe, PtTe.sub.2, WTe.sub.2, MoTe.sub.2, SnS.sub.2, Bi.sub.4Ti.sub.5O.sub.12, BiOI, Bi.sub.2WO.sub.6, Fe.sub.2O.sub.3 and WO.sub.3.

47. The method for the continuous desalination by the light-driven electrochemical catalysis according to claim 41, wherein the positive and negative active materials further comprise used one or more than one selected from the group consisting of auxiliary conductive additives NaCl, NaF, Na.sub.2SO.sub.4, KCl, CNT, GO, activated carbon, conductive carbon materials ion exchange resins, and insoluble materials.

48. The method for the continuous desalination by the light-driven electrochemical catalysis according to claim 39, wherein the conductive glass with the photosensitive semiconductor material is prepared by the following method: (a) cleaning an FTO glass; (b) preparing a transition layer on the FTO glass pre-treated in Step (a); (c) mixing and grinding a TiO.sub.2 powder, PEG, PEO, acetylacetone and a few drops of Triton X-100 in a mortar, diluting with distilled water, then sonicating and stirring overnight, then coating on the FTO glass with the transition layer obtained in step (b), and finally heating; (d) putting the FTO glass obtained in step (c) into a TiO.sub.2 solution for a treatment, and then heating the treated FTO Glass: (e) dissolving a LEG4 dye in acetonitrile to prepare a dye solution, then putting the FTO lass obtained in step (d) into the dye solution and soaking for 12 to 14 hours, then taking the FTO glass out and cleaning with alcohol to obtain the conductive glass with the photosensitive semiconductor material.

49. A light-driven electrochemical catalytic continuous flow desalination battery device for implementing the method of claim 39, wherein the light-driven electrochemical catalytic continuous flow desalination battery device is prepared by one of the following three methods: assembling according to a fixed sequence of a flow battery mold self-assembly, wherein the fixed sequence is: the conductive glass with the photosensitive semiconductor material, a photo-negative electrode active flow material or a filter paper, an anion exchange membrane, a salt solution, a cation exchange membrane or the filter paper, a positive electrode active flow material, a graphite paper; assembling according to the fixed sequence of the flow battery mold self-assembly, wherein the fixed sequence is: the conductive glass with the photosensitive semiconductor material, the photo-negative electrode active flow material or the filter paper, the anion exchange membrane, a first salt solution, the cation exchange membrane or the filter paper, a second salt solution, the anion exchange membrane, the positive electrode active flow material, the graphite paper; assembling according to the fixed sequence of the flow battery mold self-assembly, wherein the fixed sequence is: the conductive glass with the photosensitive semiconductor material, the photo-negative electrode active flow material or the filter paper, the anion exchange membrane, an intermediate flow electrolyte by being alternately layered with two salt solutions, an outermost positive and negative electrodes using the positive and negative electrode active flow materials, the graphite paper, and a plurality of anion exchange membranes and a plurality of cation exchange membranes by being alternately assembled in layers, to form the flow desalination battery device with the positive and negative electrode active flow materials, wherein the outermost positive and negative electrodes are connected to each other.

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Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0064] FIGS. 1A-1D show a device for desalination of a fluid battery in Example 1 and its electrochemical performance test diagram;

[0065] FIGS. 2A-2D are diagrams of a low-energy-consumption continuous desalination device for a fluid battery of Example 2 and its electrochemical performance test diagram;

[0066] FIGS. 3A-3E show a light-driven electrochemical catalytic continuous desalination device of Example 3 and its electrochemical performance test diagram.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Examples

[0067] Non-limiting examples of the invention will be further described in greater detail by reference to specific Examples, which should not be construed as in any way limiting the scope of the invention.

Example 1

[0068] (1) A device for desalination using a fluid battery and its preparation method: (1) First cut carbon paper, homogeneous anion exchange membrane with quaternary amine groups and homogeneous cation exchange membrane with sulfonic acid groups into 11*11 cm The square shape is consistent with the mold size of the fluid battery device (11*11*cm), and then the carbon paper and the anion and cation exchange membranes are punched to fix the device with screws, which helps to maintain pressure during the reaction and prevent Materials contaminate each other. Then put the cut carbon paper into a 1000 ml beaker, and first pour 150 ml of 4% (w/w) hydrochloric acid into ultrasound for 5 minutes, with an ultrasound power of 200 W. Subsequently, the hydrochloric acid was poured out, rinsed with deionized water, and then poured into 150 ml of absolute ethanol and ultrasonicated for 5 min (power 200 W). Finally, the absolute ethanol was poured out, rinsed with deionized water, and then sonicated with deionized water for 5 minutes (power 200 W). After the ultrasound is completed, the treated carbon paper is placed in an evaporating dish and dried at 50° C. for 2 hours. The anion and cation exchange membranes were rinsed with deionized water, and then soaked in deionized water for storage.

[0069] (2) Weigh 15 g of sodium chloride (purity 99%), dissolve it in a 1000 ml volumetric flask, and dilute to 1000 ml with deionized water to obtain a 15 g/L sodium chloride solution. Measure 40 ml of sodium chloride solution and pour it into a 50 ml beaker as the intermediate fluid electrolyte of the fluid battery.

[0070] (3) Weigh 0.008612 g of positive electrode organic 4-hydroxy-piperidinol oxide (4-Hydroxy-TEMPO, TEMPO, purity 97%), and measure 15 ml of the sodium chloride solution obtained in step (2) with a graduated cylinder, Dissolve the weighed positive electrode organics in the sodium chloride solution and fully dissolve it.

[0071] (4) Weigh 0.025718 g of negative electrode organics Riboflavin-5′-phosphate sodium salt dihydrate (FMN-Na), measure 15 ml of sodium chloride solution obtained in step (2) with a graduated cylinder, and weigh A good amount of negative electrode organics is dissolved in sodium chloride solution and fully dissolved.

[0072] (5) Build the fluid battery device according to the self-assembly and fixing sequence of the fluid battery device mold:

[0073] The fluid battery device mold is a customized mold made of acrylic material. The schematic diagram is shown in FIGS. 1A-IB. Starting from the negative electrode on the left, place mold A, tabs made of carbon cloth, carbon paper processed in step (1), mold B, foamed carbon, cation exchange membrane processed in step (1), mold C, the anion exchange membrane treated in step (1), foamed carbon, mold B, the carbon paper treated in step (1), tab carbon cloth, and mold A. Fix the device with screws, and connect the remaining opening to the peristaltic pump hose through the joint. Then put the inlet hoses of the positive electrode, the negative electrode and the intermediate fluid electrolyte in the peristaltic pump, the inlet and outlet hose ports of the positive electrode are placed in the positive organic substance at the same time, and the inlet and outlet hose ports of the negative electrode are placed in the negative organic substance at the same time. The inlet and outlet hose ports of the intermediate fluid electrolyte are placed in a beaker containing the intermediate fluid electrolyte sodium chloride at the same time. The battery clamps are clamped on the tab carbon cloth according to the positive and negative electrodes, and the carbon cloth is separated by a non-conductive plastic sheet. Place the beaker containing the intermediate fluid electrolyte sodium chloride on the magnetic stirring table, and then put the temperature electrode and the conductivity electrode of the conductivity meter in the beaker.

[0074] Using the desalination fluid battery built in this experimental example 1, the electrolyte of the fluid battery is circulated through a peristaltic pump, and the concentration change of the intermediate fluid electrolyte is tested by a conductivity meter, thereby testing the desalination capacity of the fluid battery (demineralization fluid The principle of battery desalination is shown in FIGS. 1A-1B. A constant current charge and discharge experiment with 100 mA is used to test the charge and discharge and cycle performance. The charge and discharge voltage ranges from 0.01V to 1.40V. Adopted (Shenzhen Xinwei Electronics Co., Ltd.)) The BTS battery test system tests the electrochemical performance of the desalination fluid battery in this experiment under normal temperature conditions. FIG. 1D is the charge and discharge curve of the desalination fluid battery of this example. From FIG. 1C, the specific capacity of the first charge is 3980 mAh/g, the first discharge specific capacity is 2750 mAh/g. After 20 weeks of cycling, the specific capacity remains at 300 mAh/g, and the cycle performance is good. In this example, the conductivity of the intermediate fluid electrolyte NaCl of the invention changes significantly. When it becomes smaller gradually, the electrical conductivity gradually becomes larger when discharging; the electrical conductivity also cycles repeatedly during the charge-discharge cycle, that is, it reflects the salt removal ability of the method of the present invention during charging.

Example 2

[0075] A desalination device using a fluid battery to perform low-energy consumption continuous electrochemical oxidation-reduction reactions includes the following aspects: (I) positive and negative electrode materials; (II) electrolyte; (III) fluid equipment; (IV) isolation equipment;

[0076] (I) The Preparation of the Positive and Negative Flow Materials of the Desalination Fluid battery device, the specific steps are as follows:

[0077] (1) Put 0.01 g of carboxylated carbon nanotubes into a beaker, add 100 ml of deionized water, and perform sonication of 3000 w for 10 mins to obtain mixed solution A;

[0078] (2) Add 10 mmol of AgNO3 to the mixed solution A of step (1), stir with a magnet at a speed of 1500 r/min and 0.5 h to obtain a mixed solution B;

[0079] (3) Add 400 ml of 0.8 mol/L NaBH4 solution dropwise to the mixed solution B of step (2) through a peristaltic pump; the peristaltic pump speed is: 1 rpm, and after the addition is completed, the speed is 150 r/min, 0.5 h magnetic Stirring to obtain a mixed solution C;

[0080] (4) Centrifuge the mixed solution C obtained in step (3) with deionized water and absolute ethanol at 8000 r for 15 mins (first centrifuge the mixed solution C, then add ionized water or alcohol and then centrifuge) to obtain Ag particles;

[0081] (5) Put 0.01 g of carboxylated carbon nanotubes into a beaker, add 100 ml of deionized water, and perform sonication of 3000 w for 10 mins to obtain a mixed solution D;

[0082] (6) Add 10 mmol of AgNO3 to the mixed solution D of step (5), and perform magnetic stirring at a speed of 1500 r/min for 0.5 h to obtain a mixed solution E;

[0083] (7) Add 120 ml of 0.8 mol/L NaCl solution dropwise to the mixed solution E of step (6) through a peristaltic pump; the peristaltic pump rate is: 1 rpm, and after the addition is completed, perform a magnetic field with a speed of 150 r/min and 0.5 h. Stirring to obtain a mixed solution F;

[0084] (8) The mixed solution obtained in step (8) was centrifuged at 8000 r with deionized water and absolute ethanol for 15 minutes to obtain AgCl particles;

[0085] (9) Put the Ag particles obtained in step (4), the AgCl particles obtained in step (8), and 1.8 g of activated carbon into a beaker containing 40 ml of deionized water to obtain a mixed solution G;

[0086] (10) The mixed solution G obtained in step (9) is subjected to nano ball milling (using a nano ball mill for milling) with a rotation speed of 2000 r and a time of 5 h to obtain a mixed solution H;

[0087] (II) The Salt Solution (Electrolyte) of the Desalination Fluid Battery Device is a Sodium Chloride Solution, which is Prepared by the Following Method:

[0088] (11) Prepare 30 ml of NaCl with a purity of 99.99% into a salt solution with a concentration of 10 g/L, and put it into a 50 ml beaker;

[0089] (III) The Fluid Device is Prepared by the Following Method:

[0090] (12) Assemble the fluid battery in the order of assembly (the mold of the fluid battery device is a custom-made mold made of acrylic with stable performance, and the size of the mold is 11×11×1 cm): Use the 30 ml salt solution obtained in step (11) as The intermediate fluid electrolyte is the same as the 10 ml positive and negative flow materials obtained in step (10), graphite paper, anion and cation exchange membranes (anion exchange membranes are anion exchange membranes containing quaternary amine groups and only allow anions to pass through; cation exchange The membrane is a cation exchange membrane containing sulfonic acid groups, and only cations are allowed to pass through) assembled into a desalination fluid battery device, and the fluid battery device is a customized mold. Starting from the negative electrode on the left, place mold A, tabs made of carbon cloth, carbon paper, mold B, and carbon cloth processed in step (1), and cation exchange membrane, carbon cloth, and carbon cloth processed in step (1). Mold C, the anion exchange membrane processed in step (1), mold B, carbon paper processed in step (1), tab carbon cloth, mold A. Fix the device with screws, and connect the remaining openings to the peristaltic pump hose through the joint. Then put the inlet hoses of the positive and negative electrodes and the intermediate fluid electrolyte in the peristaltic pump. The positive and negative materials are the same material. The positive and negative hoses are connected, and the inlet of the positive electrode and the outlet of the negative electrode are placed at the same time. The electrode material, the inlet and outlet hose ports of the intermediate fluid electrolyte are placed in the beaker containing the intermediate fluid electrolyte sodium chloride at the same time. The battery clamps are clamped on the tab carbon cloth according to the positive and negative electrodes, and the carbon cloth is separated by a non-conductive plastic sheet.

[0091] (IV) The Described Isolation Device is Realized by the Following Methods:

[0092] (13) In step (12), the NaCl during the charging process of the fluid battery passes through the anion and cation exchange membranes to reach the positive and negative electrodes. The active material is Ag/AgCl mixed solution (as shown in FIG. 2A). The concentration of NaCl in the electrolyte gradually decreases. The NaCl concentration in the positive and negative active flow materials gradually increases; at this time, the NaCl solution in the positive and negative active flow materials is separated by a separator, and clean water flows out from the other end, and the positive and negative materials can also be used. Repeated use, so that the real purpose of desalination can be achieved, as shown in FIG. 2A. FIG. 2B shows the process of discharge salt precipitation.

[0093] After the fluid battery device is assembled, the positive and negative electrodes are clamped in the tabs (the side close to the anion exchange membrane is connected to the positive electrode, and the side close to the cation exchange membrane is connected to the negative electrode) for electrochemical performance testing. Then use a conductivity meter to test the conductivity of the ions, and then obtain the removal ability of NaCl ions. The change of charging and discharging voltage with time is shown in FIG. 2C, and the detection of real-time conductance is shown in FIG. 2D.

Example 3

[0094] A fluid battery device that utilizes light to realize electrical energy conversion in an external circuit and electrochemical catalysis in an internal circuit for continuous desalination includes the following aspects: (1) positive and negative materials; (II) electrolyte; (III) fluid equipment; (IV) Isolation equipment;

[0095] (I) The preparation of the positive and negative flow materials of the desalination fluid battery device, the specific steps are as follows:

[0096] (1) Add 0.05 g of TEMPO particles and 0.5 g of NaCl particles to 100 mL of deionized water, 3000 w, 10 mins of ultrasound to obtain mixed solution A, which is the positive and negative active flow material;

[0097] (II) The salt solution of the desalination fluid battery device is a NaCl solution, which is obtained by the following method:

[0098] (2) Prepare 25 ml of NaCl with a purity of 99.99% into a salt solution with a concentration of 8 g/L, and put it into a 50 ml beaker;

[0099] (III) The fluid battery equipment is prepared by the following method:

[0100] (3) Assemble the fluid battery in the order of assembly (the mold of the fluid battery is a custom-made acrylic mold with very stable performance, the size is 11×11×1 cm): use the 25 mL salt solution in step (2) as the intermediate fluid (fluid Battery electrolyte) and the 50 mL positive and negative flow materials obtained in step (1), graphite paper, conductive glass with photosensitive semiconductor materials, anion and cation exchange membranes (anion exchange membranes are anion exchange membranes containing quaternary amine groups, Only anions are allowed to pass through; the cation exchange membrane is a cation exchange membrane containing sulfonic acid groups, and only cations are allowed to pass) to form a desalination fluid battery device, and the fluid battery device is a customized mold. Starting from the negative electrode on the left, place conductive glass with photosensitive semiconductor material, tabs made of carbon cloth, negative flow material chamber, anion exchange membrane, intermediate salt stream chamber, cation exchange membrane, positive flow material chamber, pre-treated graphite paper, carbon cloth. At this time, use a hose to connect the water outlet of the negative flow material chamber and the water inlet of the positive material chamber with a peristaltic pump hose, and at the same time place the water inlet hose of the negative electrode and the inlet hose of the intermediate salt solution in the peristaltic pump. With the same electrolyte, the positive and the negative electrode chambers are connected, and the negative water inlet hose and the positive water outlet hose are placed in the solution beaker configured in step (1), and the water inlet and outlet of the salt solution are in the middle. The nozzle of the nozzle is placed in the solution beaker in step (2) at the same time, and the water inlet is also connected to the probe of the conductivity meter at the same time. The battery clamp is clamped on the tabs according to the positive and negative poles, and is separated by a plastic sheet in the middle to prevent short circuits.

[0101] (IV) The described isolation device is realized by the following methods:

[0102] (4) In step (3), the NaCl during the discharge process of the flow battery passes through the anion and cation exchange membrane to reach the positive and negative active materials to form a mixed solution. The concentration of NaCl in the electrolyte gradually increases; at this time, the electrode is separated by a separator. The NaCl solution in the active flow material is isolated, and clean water flows out from the other end. The positive and negative materials can be reused, which can achieve the purpose of real desalination, as shown in FIGS. 3A-3C.

[0103] After the flow battery device is assembled, the light source is turned on, and the light source is vertically irradiated on the conductive glass with photosensitive semiconductor material. Clamp the positive and negative electrodes of the electrochemical workstation on the tabs (close to the anion exchange membrane to the negative electrode, and to the cation exchange membrane to the positive electrode) for electrochemical performance testing. Then use the conductivity meter to test the conductivity of the ions, so that the salt removal ability can be tested. FIG. 3D shows the I-V curve of the photosensitive semiconductor material under dark and light conditions. It can be seen that the selected photosensitive semiconductor material can generate a stable and higher current under light conditions and can be used for discharge desalination tests.

[0104] When LEG4 is illuminated, TEMPO molecules undergo redox reactions and are continuously removed from the salt solution. The voltage change of the preliminary test is shown in FIG. 3E: under dark conditions, the open circuit voltage is 0.16V; when illuminated, the open circuit voltage immediately rises to 0.65V; when the cross-current discharge is 0.1 mA, the voltage decreases and maintains, and the salt concentration in the salt solution decreases.

[0105] The above-mentioned embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations, etc. made without departing from the spirit and principle of the present invention Simplified, all should be equivalent replacement methods, and they are all included in the protection scope of the present invention.