113 results about "Capacitive deionization" patented technology

The invention discloses an asphalt-based double-salt template porous carbon electrode material as well as a preparation method and application thereof, and relates to the technical field of porous carbon electrode materials. The preparation method sequentially comprises the following steps: adding asphalt into concentrated nitric acid, stirring for reaction, and washing to obtain a nitration product; and uniformly mixing the nitration product, active organic potassium salt and inert inorganic carbonate, performing ball milling, then performing pre-oxidation and carbonization treatment, and washing to be neutral to obtain the asphalt-based double-salt template porous carbon electrode material. The invention also discloses the asphalt-based double-salt template porous carbon electrode material and application of the asphalt-based double-salt template porous carbon electrode material in removal of nitrate radicals and ammonia nitrogen in a water body through a capacitive deionization technology. According to the invention, a macropore-mesopore-micropore synergistic hierarchical pore structure is constructed in an asphalt carbon skeleton through a double-salt template, efficient adsorption of two nitrogen pollutants of nitrate and ammonia nitrogen is realized, and the method has important practical application value.

There is provided a method for controlling at least one capacitive deionization (CDI) cell used for water desalination. The method comprises subsequent to feeding the at least one CDI cell with water at an initial flow rate, obtaining a measurement of an actual output concentration of water exiting the at least one CDI cell, comparing the actual output concentration to a concentration setpoint, determining, based on the comparing, a change to be applied to the initial flow rate for adjusting the output concentration towards the concentration setpoint, and outputting at least one control signal comprising instructions to cause the change to be applied to the initial flow rate to obtain a modified flow rate and to cause the at least one CDI cell to be fed with water at the modified flow rate.

The invention discloses a method for preparing porous activated carbon based on pulse electrochemical activation, the porous activated carbon and application, and the method comprises the following steps: preparing a working electrode plate from carbon powder, and placing the working electrode plate in an electrolyte for pulse electrochemical square wave circulation treatment, wherein the electrolyte is an aqueous solution containing sulfuric acid, persulfate, sulfate and a cationic surfactant, stripping, cleaning and drying to obtain the porous activated carbon. According to the preparation method, the carbon powder is prepared into the working electrode plate, and the working electrode plate is subjected to pulse electrochemical square wave circulation treatment in the electrolyte containing the sulfuric acid, the persulfate, the sulfate and the cationic surface active agent, so that the porous activated carbon with large specific surface area, high electro-adsorption capacity and good conductivity can be prepared; when being used as a raw material for preparing a capacitive deionization electrode, the composite material shows good conductivity, high desalination capacity and high desalination rate, can be widely used for electro-adsorption desalination, and is high in use value and good in application prospect.

An electrode for a capacitive deionization device according to the concept described herein includes a current collector and an active material layer disposed on one surface of the current collector, in which the active material layer includes: a plurality of porous structures each including a plurality of carbon nanotubes; and a binder for fixing the plurality of porous structural bodies to the current collector, and each of the plurality of porous structural bodies includes a wide-bottom narrow-top structure that widens in a direction away from the current collector.

The invention relates to a low-concentration nitrate nitrogen removal and conversion method based on functionalized flowing electrode slurry, which comprises the following steps: in a low-concentration nitrate nitrogen polluted water body, using the functionalized flowing electrode slurry to carry out capacitive deionization treatment under external first voltage so as to realize selective adsorption and concentration of nitrate nitrogen, the functionalized flowing electrode slurry comprises a carbon material which is modified by functional groups and has electrocatalytic activity; and carrying out electrochemical reduction reaction on the functionalized flowing electrode slurry subjected to nitrate nitrogen concentration under external second voltage, and reducing the adsorbed nitrate nitrogen into ammonia, so as to realize removal and recycling of the nitrate nitrogen. According to the invention, through a two-step process design of first transfer and second conversion, and by adopting the functionalized flowing electrode slurry, the two problems of deep removal and resource recovery of low-concentration nitrate nitrogen are effectively solved.

The application discloses a kind of high-salt mine water processing device and processing method, belong to high-salt mine water processing technical field, to solve at least one of the problems, such as huge energy, infrastructure complexity, unable batch processing wastewater in prior art high-salt mine water processing.The application, processing device, including anode flow electrode tank, cathode flow electrode tank, high-salt mine water tank, clean water tank and flow electrode capacitive deionization component;Flow electrode capacitive deionization component includes anode side current collector plate, cation exchange membrane, processing liquid cavity plate, anion exchange membrane and cathode side current collector plate in turn, anode flow electrode tank and anode side current collector plate are communicated to constitute anode flow electrode circulation loop, cathode flow electrode tank and cathode side current collector plate are communicated to constitute cathode flow electrode circulation loop, high-salt mine water tank, processing liquid cavity plate and clean water tank are communicated in turn to constitute high-salt mine water and clean water circulation loop.The application can be used for the processing of high-salt mine water.

The invention provides a keep-alive system, an ion concentration adjusting system and a refrigeration house. The keep-alive system comprises a salt solution providing unit, a capacitive deionization unit and a keep-alive unit, wherein the keep-alive unit is used for storing a product to be kept alive. A capacitive deionization unit is introduced into the keep-alive system, a salt solution providing unit provides an initial salt solution for the capacitive deionization unit, and the capacitive deionization unit is used for providing the salt solution in a target ion concentration range for a keep-alive unit to use after adjusting the ion concentration of the initial salt solution to the target ion concentration range required by a product to be kept alive. Therefore, a good keep-alive effect on products (such as marine aquatic products) to be kept alive is achieved. By introducing the capacitance removal unit, breakthrough can be achieved in the aspects of energy conservation, high efficiency, water quality stability, intelligent degree and multifunctional adaptability, the energy efficiency, intelligent level and applicability of the keep-alive system are improved, and the keep-alive survival rate and the system greening level are improved.

The invention discloses a flowing electrode capacitive deionization device and a flowing electrode capacitive deionization method for desulfurization wastewater, which mainly form a concentrated water area and a fresh water area through two anion exchange membranes and a cation exchange membrane, improve the sulfate ion selective migration efficiency and weaken the concentration polarization effect. According to the main technical scheme, a positive electrode and a negative electrode are arranged on the two opposite sides of an intermediate treatment chamber, two anion exchange membranes are located between the positive electrode and the negative electrode, and a cation exchange membrane is located between the anion exchange membranes and the negative electrode; a concentrated water area is formed between the two anion exchange membranes, a fresh water area is formed between the cation exchange membranes and the anion exchange membranes, and adsorption flow channels are respectively formed between the positive electrode and the anion exchange membranes and between the cation exchange membranes and the negative electrode; the desulfurization wastewater circulating system is communicated with the concentrated water area and the fresh water area; and the flowing electrode circulating system is communicated with the two adsorption flow channels. The method is mainly used for deionization.

The preparation method comprises the following steps: mixing an active material, a conductive agent, a binder, a film-forming additive and a solvent to prepare slurry, coating a current collector with the slurry, preparing a pole piece, placing the pole piece in an electrolyte, electrifying, increasing the voltage to 1.5-1.8 V in a stepped manner, keeping the constant voltage until the accumulated charge quantity reaches 50-80 C / g, and reducing the voltage to 0.5-1.0 V, so as to obtain the capacitive deionization electrode. And standing in an electrolyte, and performing interface structure relaxation on the pole piece to obtain the capacitive deionization electrode. The capacitive deionization electrode prepared by the invention has the advantages of high ionic conductivity, strong chemical stability, good pollution resistance and the like, can be used as a working electrode for electro-adsorption desalination, can meet the electro-adsorption water treatment requirement of a multi-ion system, and is especially suitable for a complex water body containing multiple cations. The overall effects of high performance, long service life and low cost are shown, the use value is high, and the application prospect is good.

The present invention relates to a flow-electrode capacitive deionization device comprising: a plurality of flow-electrode cartridge units arranged in a first direction, through each of which an electrode fluid flows, and which allow ions to permeate through at least one of both sides in the first direction; raw water flow units respectively coupled, between each pair of adjacent flow-electrode cartridge units in the first direction, to the flow-electrode cartridge units positioned on both sides thereof in the first direction, through which raw water to be deionized flows, and which allows ions to permeate through both sides in the first direction; housings configured to seal, in the first direction, the flow-electrode cartridge units which are respectively arranged at the outermost ends on both sides in the first direction; and a positive power line and a negative power line alternately connected to the plurality of flow-electrode cartridge units in the first direction so that the plurality of flow-electrode cartridge units alternately form positive-electrode flow-electrode cartridge units and negative-electrode flow-electrode cartridge units in the first direction, wherein, when power is applied through the positive power line and the negative power line, negative ions in the raw water flowing through each of the raw water flow units move into the electrode fluid in the positive-electrode flow-electrode cartridge units, and positive ions in the raw water flowing through each of the raw water flow units move into the electrode fluid in the negative-electrode flow-electrode cartridge units.

The invention discloses a preparation method of a nitrogen-sulfur co-doped modified layered double-oxide material, and belongs to the technical field of water treatment.The preparation method comprises the following steps that 1, a carbon felt substrate is pretreated and dried, the treated substrate is placed in a uniform solution containing Fe (NO3) 3.9 H2O and Ni (NO3) 2.6 H2O to be subjected to a hydrothermal reaction, and after the hydrothermal reaction is completed, the substrate is taken out and dried; carrying out ultrasonic treatment and washing with deionized water to obtain a NiFe-LDH precursor; and (2) drying the obtained precursor, dipping the dried precursor in an ethanol solution of ammonium persulfate, and then carrying out high-temperature carbonization treatment in an inert gas atmosphere to prepare the nitrogen-sulfur co-doped modified nickel-iron layered double-oxide material. The difference of nitrogen and sulfur in atomic radius, electronegativity and doping form enables the co-doped structure to effectively regulate and control the electronic structure of the material: nitrogen doping improves conductivity, and sulfur doping promotes exposure and stability of active sites. The co-doping synergistically optimizes the electronic structure and catalytic activity of the material, so that the material has excellent capacitive deionization removal performance and electrocatalytic activity at the same time.

The present application relates to water purification technical field, provide a kind of water purification assembly and water purification equipment.The water purification assembly includes: shell, front filter element, capacitive deionization filter element, rear filter element and reversing valve;Shell has accommodating cavity and with accommodating cavity communication inlet port, outlet port and waste water outlet;Front filter element, capacitive deionization filter element and rear filter element are respectively arranged in accommodating cavity, inlet port, front filter element and capacitive deionization filter element sequentially form fluid communication, and fluid communication is formed between rear filter element and outlet port;Reversing valve has first state and second state, when reversing valve is in first state, reversing valve controls the flow direction of the purified water output by capacitive deionization filter element to rear filter element;When reversing valve is in second state, reversing valve controls the flow direction of the waste water output by capacitive deionization filter element to waste water outlet.The present application realizes the integrated design of water purification assembly, and the space occupied is small, and the switching between purified water outlet mode and waste water outlet mode can be conveniently carried out.

The application relates to the technical field of flow electrode capacitive deionization, and discloses a preparation method of flow electrode material, a flow electrode and a water treatment device, wherein the preparation method of the flow electrode material is embedding hydrophilic nitric acid treated carbon black particles in the interlayer structure of conventional LDH flow electrode material to form NCB-LDH flow electrode material; the flow electrode is prepared by mixing the NCB-LDH flow electrode material and suitable electrolyte to form slurry, and the flow electrode has good charge utilization efficiency, energy efficiency and desalination rate; the water treatment device comprises a water treatment module, a first cation membrane, an anion membrane and a second cation membrane are sequentially arranged in the shell of the water treatment module and are parallel to each other, the water treatment device can realize efficient water purification under the dispersed conditions in remote areas, has the advantages of zero energy consumption, compatibility with people and livestock, internal regeneration of the flow electrode, miniaturization, economization and the like.

The application relates to an energy efficiency optimization method, medium and system of a capacitive deionization system, which is suitable for energy-saving operation regulation and control of the capacitive deionization system. The method firstly constructs a multi-physical field simulation model coupling electric field, fluid and mass transfer, simulates an electric loss distribution curve in a deionization process, and determines preliminary adsorption time length parameters according to the electric loss distribution curve. Then, the adsorption time length parameters and preliminary desorption time length parameters that are optimal in energy efficiency are calculated and corrected by comprehensively considering factors such as auxiliary system power consumption and pumping energy consumption, so that adaptive adjustment of system cycle operation parameters under different working conditions is realized. Finally, under the premise of ensuring electrode full regeneration, the water inflow speed and desorption time length parameters in the desorption stage are adjusted based on the simulation model, the water recovery rate and energy recovery efficiency of the system are improved, and the overall energy consumption is reduced. The application realizes intelligent operation control of the electric adsorption process under the condition of multiple working conditions, and has high engineering adaptability and popularization value.

This invention relates to the field of water purification equipment technology, and provides a water purification equipment and a method and control device for configuring the polarity of its filter element. The method for configuring the polarity of the filter element includes: acquiring the voltage difference across a capacitive deionization filter element; determining the polarity control configuration information of the capacitive deionization filter element through a commutation execution module based on the voltage difference being within a preset voltage range; the water purification equipment includes a control module and a capacitive deionization filter element, the control module includes a detection circuit and a commutation execution module, the detection circuit is used to detect the voltage difference, and the commutation execution module is used to establish polarity control configuration information based on the direction of the voltage difference, the polarity control configuration information is used to indicate the correspondence between the output direction of the commutation execution module and the actual polarity of the capacitive deionization filter element, so that the commutation execution module provides a working electric field with the correct polarity to the capacitive deionization filter element according to the polarity control configuration information.

The utility model discloses a capacitive deionization purification device for saline-alkali soil drainage, which relates to the related technical field of saline-alkali soil drainage treatment and comprises a filter box, a filter mechanism is mounted in the filter box, a communicating pipe is arranged below the filter mechanism, and a capacitive deionization main body device is arranged on one side of the filter box. A drain pipe penetrates through the capacitive deionization main body device and is communicated with the communicating pipe, a photovoltaic solar panel is arranged at the top of the capacitive deionization main body device, an energy storage unit is connected to the bottom of the photovoltaic solar panel, and the energy storage unit is fixedly mounted above the capacitive deionization main body device. Impurities such as lumps and particles in water are removed through the filtering mechanism, multi-layer filtering treatment is carried out on drained water quality of the saline-alkali soil, and the water sample purification rate can be improved; and meanwhile, better efficiency and lower energy consumption are achieved, the quality of drained water of the saline-alkali soil can meet the requirements for low cost, large amount, easy obtaining and the like of irrigation water in arid region agricultural production after being purified, and the agricultural irrigation cost of the arid region is reduced.

The application relates to a preparation method of a sulfonated polypyrrole / nitrogen-doped biocarbon / MnO2 integrated electrode. First, biocarbon is modified by nitrogen doping; then, the nitrogen-doped biocarbon is compounded with MnO2 with high pseudo-capacitance. On this basis, a sulfonated polypyrrole film is further deposited on the surface of the biocarbon / MnO2 electrode by electro-deposition to serve as an ion exchange film, so as to construct the sulfonated polypyrrole / nitrogen-doped biocarbon / MnO2 integrated electrode. Therefore, the specific capacitance, hydrophilicity and ion exchange film selective permeability of the electrode are significantly improved, and the desalination performance of the MCDI in treating low-concentration uranium-containing wastewater is improved. The sulfonated polypyrrole / nitrogen-doped biocarbon / MnO2 integrated electrode prepared by the application has the advantages of high specific capacitance, good conductivity and easy preparation. The sulfonated polypyrrole / nitrogen-doped biocarbon / MnO2 integrated electrode prepared under the optimal conditions is used for treating uranium-containing wastewater by membrane capacitive deionization, the membrane permeation flux is 0.021 m 3 / (m 2 .h), the adsorption equilibrium time is 60 min, the uranium removal rate reaches 92%, and the uranium removal capacity is 460 mg / g.

This invention provides a Ni-MOF / Ti3C2T for capacitive deionization technology. x Composite electrode materials, their preparation methods, and applications are disclosed. The preparation method includes: dissolving fluoride in an aqueous HCl solution to prepare an etching solution; adding Ti3AlC2 powder to the etching solution, stirring, transferring to a reaction vessel, reacting at 80–100°C for 3–6 days, collecting the precipitate, washing the precipitate with deionized water by centrifugation until the pH of the supernatant is 6–7, and then washing with anhydrous ethanol by centrifugation 3–5 times; after centrifugation and washing, adding to an aqueous LiCl solution, reacting, and then washing the product with deionized water by centrifugation 3–5 times to obtain Ti3C2T. x Materials; Ti3C2T x The material was dispersed in an ethanol solution, Ni(NO3)2·6H2O was added and stirred to obtain a first solution; H3BTC was dissolved in ethanol to obtain a second solution; the first and second solutions were mixed and transferred to a reaction vessel, and reacted at 130–170 °C for 18–30 h; after naturally cooling to room temperature, the material was washed 3–5 times by centrifugation with anhydrous ethanol, and then freeze-dried to obtain Ni-MOF / Ti3C2T. x Composite electrode material. The Ni-MOF / Ti3C2T of this invention... x Composite electrode materials exhibit good electrochemical performance.

This application relates to the field of capacitive deionization technology, and particularly to an electrode for capacitive deionization and its preparation method. The electrode for capacitive deionization comprises an electrode material, a carbon material, and a binder. The electrode material is DHPZ. The preparation method of DHPZ includes the following steps: S1, preliminary reaction: 2,5-dihydroxy-1,4-benzoquinone and 2,3-diaminophenazine are ground and mixed, heated in an inert gas atmosphere, cooled, filtered, washed, and vacuum dried to obtain a primary product; S2, acidification treatment of the primary product: The primary product is mixed with 2 mol / L nitric acid at a mass-to-volume ratio of 1:1, magnetically stirred for 5 hours, filtered, washed with deionized water, centrifuged multiple times, and vacuum dried at 60°C for 15 hours to obtain the DHPZ. This application provides an electrode for capacitive deionization and its preparation method to solve the problems of low desalination capacity, low adsorption capacity, and low removal efficiency in related capacitive deionization technologies.

The invention discloses a method for simply and conveniently preparing a capacitive deionization high-efficiency defluorination anode material based on waste biomass enteromorpha, the anode material with excellent CDI defluorination performance is developed by adjusting a biological derived carbon preparation process based on natural enteromorpha, and the technical system is low in raw material price, simple in obtaining mode and high in practicability. The self-forming of the porous structure of the material is realized through the combination of carbonization and freeze drying. Compared with a traditional anode material preparation process, the method has the advantages of simple and convenient reaction steps, easiness in batch production, more high-value byproducts and the like, carbon emission in a traditional preparation method is greatly reduced, the industrial application potential is remarkably improved through an environment-friendly production mode, and the technical requirements of large-scale clean production can be met.

Provided is a method for manufacturing an organic solvent-free capacitive deionization electrode including: coating one surface or one and the other surfaces of a current collector with an active layer slurry including an electrode active material, an aqueous binder, a dispersant, and an aqueous solvent; drying the active layer slurry; combining the dried active layer and an ion exchange membrane using an adhesive including a porous material and the aqueous binder; and drying an electrode in which the active layer and the ion exchange membrane are combined.

A capacitive deionization device comprises: a pair of electrodes; and a controller configured to perform a water softening operation that applies a positive voltage across the pair of electrodes, configured to operate in a power-off mode that short-circuits or open-circuits the pair of electrodes based on termination of the water softening operation, and configured to perform a regeneration operation that applies a negative voltage across the pair of electrodes based on satisfaction of a predetermined condition while operating in the power-off mode.

This application discloses a method and apparatus for electrochemical extraction to obtain low-impurity lithium ions, relating to the field of capacitive deionization technology. The apparatus includes a positive current collector and a negative current collector with a working surface coated with mesoporous activated carbon material and a chemically de-intercalated lithium ion sieve. A lithium-ion-containing solution circulates between the working surfaces of the positive and negative current collectors. A voltage is applied to insert lithium ions into the chemically de-intercalated lithium ion sieve. After the power is turned off, the cations adsorbed by the mesoporous activated carbon material are re-desorbed. The resulting lithium-ion-intercalated sieve electrode is placed in an electrolyte solution and a voltage is applied to remove lithium. This application uses mesoporous activated carbon material as the negative electrode to adsorb impurity cations in the salt solution. The impurity cations are enriched on the surface of the activated carbon and do not accumulate on the surface of the ion sieve, hindering the absorption of lithium. + By placing the lithium ion extraction device closer to the chemical deintercalation sieve, the content of impurity cations intercalating into the sieve lattice can be reduced, thereby improving the lithium extraction efficiency and purity of the sieve.

The invention discloses application of a poly (benzodifuran diketone) (PBFDO) membrane in a capacitive deionization (CDI) desalination system, and belongs to the technical field of water treatment. The PBFDO is an n-type conjugated polymer, has an environment-stable long-range ordered skeleton structure and abundant carbonyl (C = O) functional groups, and can provide sufficient active sites for Naion capture. The PBFDO is used for the CDI electrode material for the first time, and the constructed CDI desalting system shows relatively high salt adsorption capacity (78.8 mg g < 1 >), excellent adsorption rate (2.6 mg g < 1 > min < 1 >), relatively low energy consumption (0.34 Wh g < 1 >) and good cycle stability. The PBFDO electrode material has efficient ion adsorption performance and excellent electrochemical stability, and a new material system and an application approach are provided for development of a novel polymer-based CDI desalination technology.

This invention discloses a modified grapefruit peel-based carbon aerogel, its preparation method, and its applications, belonging to the field of adsorbent preparation technology. The preparation method involves placing the grapefruit peel-based carbon aerogel in a potassium hydroxide solution and stirring at 75–85°C for 2.5–3.5 hours. After stirring, the mixture is filtered and dried, then calcined at 850–950°C for 1–1.5 hours in a nitrogen atmosphere. This invention solves the problems of low adsorption capacity and poor selectivity in current adsorbent materials. The modified grapefruit peel-based carbon aerogel electrode exhibits preferential selectivity for nitrates and phosphates. The invention utilizes capacitive deionization technology, resulting in low energy consumption and cost savings. The electroadsorption system electrode uses grapefruit peel as a raw material, which is widely available, convenient, and inexpensive. The resulting biomass-based carbon aerogel has the advantages of being renewable, biodegradable, and rich in carbon sources. It also enables the recycling of waste grapefruit peels, making it an environmentally friendly renewable material.

The application discloses a membrane capacitive deionization anode and a preparation method thereof and a membrane capacitive deionization system, relates to the technical field of wastewater treatment and resource utilization, and discloses a membrane capacitive deionization anode preparation method, which comprises the following steps: providing oxidized carbon, wherein the surface of the oxidized carbon contains carboxyl groups; dispersing the oxidized carbon in water, adding nitrate, a first metal salt containing divalent metal ions and a second metal salt containing trivalent metal ions for pre-adsorption; adjusting the pH value and performing crystallization to make the divalent metal ions and the trivalent metal ions form a layered double hydroxide (LDH), so as to obtain an LDH / oxidized carbon composite anode material; and preparing a slurry of the LDH / oxidized carbon composite anode material and loading the slurry on a current collector to obtain the membrane capacitive deionization anode. The embodiment of the application prepares a membrane capacitive deionization anode with high capacity, low energy consumption and excellent ion selectivity, and can efficiently recover phosphates from wastewater.

The present disclosure relates to a method for making a carbon aerogel electrode material. The method involves initially making a wet organic sol-gel form. The sol-gel form is carbonized at a temperature of from about 900° C. to about 1000° C., for from about 2 hours to about 4 hours. The carbonized sol-gel is then activated under carbon dioxide flow, for from about 0.5 hour to about 1.5 hours, at from about 900° C. to about 1000° C.

The invention discloses preparation and application of a composite polyaniline electrode material. The preparation method of the composite polyaniline electrode material comprises the following steps: dispersing graphite-phase carbon nitride in an acid solution to obtain a g-C3N4 dispersion liquid; adding bismuth oxide and an aniline monomer into the g-C3N4 dispersion liquid, and uniformly mixing to obtain a raw material liquid; adding ammonium persulfate into the raw material solution under an ice bath condition, reacting, and filtering to obtain a precipitate; and calcining the precipitate to obtain the composite polyaniline electrode material. G-C3N4, polyaniline and bismuth oxide have a synergistic effect, a composite structure with high specific surface area, excellent conductivity and good hydrophilicity is formed, and favorable conditions are provided for rapid transmission and efficient adsorption of ions. The composite electrode material provided by the invention is not only suitable for treatment of chlorine-containing wastewater, but also can be expanded to be applied to capacitive deionization removal of other anions and electro-adsorption removal of heavy metal ions, and has a wide application prospect in the field of industrial wastewater treatment.

The invention relates to an MXene-based composite electrode material and a preparation method and application thereof, and relates to the field of capacitive deionization. The MXene-based Fe3O4 composite material is synthesized by mixing soluble ferric salt, acetate, urea and a polymer in ethylene glycol through a one-step hydrothermal method, and the prepared electrode is applied to capacitive deionization (CDI) copper removal engineering. Experiments show that the specific capacitance of the composite material is 163.7 F / g under a three-electrode system, and the copper removal capacity can reach 53.9 mg / g within 30 min when 1.2 V voltage is applied. According to the invention, the three-dimensional layered MXene is compounded with the spherical Fe3O4 nanoparticles, so that on one hand, the interlayer spacing of the MXene is enlarged to promote ion diffusion; on the other hand, the volume expansion of Fe3O4 in the copper removal circulation process is relieved by utilizing the structure advantage, and the circulation stability is kept; in addition, the introduction of carbon can improve the conductivity of the composite material and increase the specific capacitance. Based on the research, the CDI technology is effectively applied to heavy metal removal.