232 results about "Capacitive deionization" patented technology

The utility model relates to the technical field of water purification, in particular to a capacitive deionization filter element and water purification equipment. The capacitive deionization filter element comprises an electrode assembly, the electrode assembly comprises an insulating sheet and at least two layers of electrode plates, the insulating sheet and the electrode plates are arranged in a laminated mode, and the insulating sheet is clamped between the two adjacent layers of electrode plates; the electrode plate comprises a current collector layer and adsorption layers, and the adsorption layers are arranged on the front and back surfaces of the current collector layer; two adjacent layers of electrode plates are respectively configured as a positive plate and a negative plate, and a water passing channel for accommodating the insulating sheet is formed between the positive plate and the negative plate. The capacitive deionization filter element disclosed by the utility model is relatively simple in structure, simplifies the lamination arrangement process of the electrode assemblies, is convenient to process and produce, reduces the processing cost, and can ensure the purification treatment effect on raw water to a certain extent.

The utility model discloses a device for enhancing ion membrane-passing mass transfer based on full-channel flow electrode capacitive deionization, which comprises solution chambers, a cathode flow electrode chamber and an anode flow electrode chamber, the solution chambers comprise a first solution chamber and a second solution chamber, and an anion exchange membrane is arranged between the solution chambers. The two solution chambers are respectively provided with a guide plate, and each guide plate comprises a high-conductivity saline-water mixed solution channel. And the water flow directions of the two solution chambers are opposite. The first solution chamber and the second solution chamber contain high-conductivity saline mixed liquid which is formed by mixing pretreated seawater and a high-conductivity material. According to the FCDI device and the seawater desalination system, the middle solution chamber is additionally arranged, high-conductivity materials are added into the middle solution chamber, a flow guide channel of the middle solution chamber and mixed solution convection of different solution chambers are designed, and the phenomena of high resistance and membrane-liquid interface concentration polarization of the FCDI device system are solved; the desalting efficiency and the energy consumption performance are enhanced; the operation cost is reduced.

The invention belongs to the field of lithium recovery, and particularly relates to a method and a system for electrochemically recovering lithium ions in ternary lithium battery leachate. The method comprises the following steps: (1) leaching the cathode material of the waste ternary battery to obtain a ternary leachate; (2) performing lithium ion enrichment in a capacitive deionization device by taking the ternary leaching solution obtained in the step (1) as a lithium source to obtain a lithium-rich receiving solution and a lithium-removed recycling solution; (3) recovering the lithium-rich receiving liquid to obtain recovered lithium; and performing non-lithium metal element recovery on the lithium-removed recovery liquid. According to the technical scheme, the rocking chair type capacitive deionization RCDI system adopts a waste ternary battery cathode material (SNCM) as an electrode material, the extraction quantity of a single reaction cycle can reach 4.90 mM g <-1 >, continuous and selective lithium extraction is realized, and meanwhile, the cost and the environmental influence are reduced.

The invention discloses a method for treating heavy metal wastewater by using a bimetal MOFs (Metal-Organic Frameworks) derived carbon-porous carbon composite electrode material. The method comprises the following steps: preparing the bimetal MOFs derived carbon-porous carbon into a composite electrode material, and assembling the composite electrode material as a working electrode into a capacitive deionization device; and carrying out electro-adsorption treatment on the heavy metal wastewater by utilizing the capacitive deionization device to finish treatment on the heavy metal wastewater. According to the present invention, the bimetallic MOFs derived carbon-porous carbon assembled capacitive deionization device is utilized to treat the heavy metal wastewater, such that the characteristics of high adsorption capacity and selective adsorption are provided while the heavy metal ions are efficiently and rapidly removed so as to achieve the efficient removal of the heavy metals in the wastewater, and the selective recovery of the toxic and harmful metals can be performed; the method has the advantages of being low in cost, simple in process, convenient to operate, high in treatment efficiency, good in removal effect, environmentally friendly and the like, and has high application value and wide application prospects in the aspect of heavy metal polluted water treatment.

The invention discloses a plasma modified biochar electrode and a preparation method and application thereof. The plasma modified biochar electrode is obtained by performing plasma modification on a biochar electrode for 15-45 minutes under the vacuum degree of 300-1000 mT through a plasma cleaning machine. The biochar electrode is obtained by coating a current collector with electrode slurry containing biochar, a conductive agent and an adhesive and drying the electrode slurry; the biochar is prepared by the following steps: performing pyrolysis carbonization treatment on a biomass raw material under a limited oxygen condition to obtain original biochar, soaking the obtained original biochar in a KOH aqueous solution, drying, and performing heat treatment activation; the biomass raw material is sesame shells. The biochar electrode prepared by the invention has better hydrophilicity and electrochemical performance, and has better desalination amount and desalination stability when being used for electro-adsorption desalination in capacitive deionization.

The invention discloses a molten salt dielectric heat conduction chemical preparation method of a flat wood carbon electrode substrate material, a wood carbon electrode precursor is covered with molten salt, the molten salt dielectric heat conduction chemical synthesis is carried out according to the heating-heat preservation-cooling process, and the molten salt is a mixture formed by mixing inert molten salt and active molten salt; and removing condensed fused salt on the surface of the synthetic product, polishing the surface, and drying to obtain the wood carbon electrode substrate material. According to the preparation method, the problems of high cost, high energy consumption, narrow application range and the like in preparation of a high-performance plate electrode substrate carbon material aiming at integral wood with a specific size are solved, and the self-supporting electrode material substrate which is low in cost, has a hierarchical pore structure and has comprehensive performance is obtained. The obtained wood carbon electrode substrate material can be used as a plate electrode substrate carbon material; alternatively, a high surface capacitance plate electrode is directly used for capacitive deionization or supercapacitors.

The invention relates to the technical field of water treatment, and discloses a reclaimed water reuse treatment process suitable for island high-chlorine tail water, which comprises the following steps: when the real-time chloride ion concentration value is not higher than the chloride ion concentration threshold value, introducing the pretreated water into a low-salinity treatment path, and carrying out first desalination treatment by adopting a capacitive deionization technology; and when the real-time chloride ion concentration value is higher than the chloride ion concentration threshold value, guiding the pretreated water into a high-salinity treatment path, and carrying out second desalination treatment by adopting a reverse osmosis technology. A parallel double-path deep desalination framework is constructed, an intelligent control system guides water flow into an MCD I path or an LPRO path, and frequent switching of the system at a critical point is avoided by setting a hysteresis interval, so that a treatment path with the lowest instantaneous operation cost is automatically selected according to real-time water quality, energy consumption optimization in a full working condition range is realized, and the energy consumption is reduced. And long-term stable and efficient operation of the system is ensured.

The utility model relates to the technical field of water purification, and provides a water purification assembly and water purification equipment. The water purification assembly comprises a capacitive deionization filter element, the capacitive deionization filter element comprises a central column and an electrode assembly, the electrode assembly is wound around the peripheral wall of the central column, the two ends, in the axial direction of the central column, of the electrode assembly are sealed, the outer side of the electrode assembly is used for receiving input of raw water, and the inner side of the electrode assembly is used for outputting purified water or waste water; the center column is provided with a water outlet channel, a water passing hole and a water outlet, the water passing hole and the water outlet are communicated with the water outlet channel, the water outlet channel is arranged in the center column, the water outlet is formed in the first end of the center column, and the water passing hole is formed in the peripheral wall close to the second end of the center column. According to the utility model, bubbles generated in the filter element can be effectively discharged in the desalting process of the capacitive deionization filter element, so that the capacitive deionization filter element can be prevented from generating noise in the working process, and the water purification treatment effect of the capacitive deionization filter element is ensured.

The invention relates to a wastewater treatment method, in particular to a capacitive deionization-oxidation coupling high-salt industrial wastewater treatment process, which comprises the following steps: firstly, carrying out micro-filtration to remove suspended matters and adjust the pH value, then carrying out low-voltage electro-adsorption desalination through a modified capacitive deionization unit, collecting electric energy released in a regeneration stage, converting the electric energy into electric energy of a catalytic oxidation unit through a converter, and carrying out high-salt industrial wastewater treatment. Desalted water enters a non-free radical catalytic oxidation unit, a UV-LED excitation catalyst activates persulfate, singlet oxygen is generated to degrade organic matter, an intelligent control system dynamically adjusts voltage, medicament and energy distribution according to the water inlet condition, finally, capacitive deionization regeneration liquid is subjected to multi-stage membrane concentration and crystallization, salt products are recycled, and waste water treatment and recycling are achieved.

The invention belongs to the technical field of phosphorus-containing wastewater treatment and recycling, and relates to a flowing electrode capacitive deionization system and method for selective enrichment of phosphorus in phosphorus-containing wastewater. According to the structure, a first collector plate, a first anion exchange membrane, a cation exchange membrane, a second anion exchange membrane and a second collector plate are sequentially arranged in parallel from left to right; the ion exchange membranes divide the system into an anode flow electrode chamber, a first solution chamber, a second solution chamber and a cathode flow electrode chamber; electrode liquid in the anode flowing electrode chamber, the cathode flowing electrode chamber and the electrode liquid storage chamber circularly flows; the technical problems of low phosphorus enrichment multiple, poor selectivity, large acid and alkali consumption, high treatment cost and easy scaling are solved, and the method has good application prospects in the aspects of phosphorus-containing wastewater treatment and phosphorus recovery.

The invention discloses shaddock peel activated carbon for capacitive deionization as well as a preparation method and application of the shaddock peel activated carbon, and belongs to the technical field of capacitive deionization. The preparation method of the shaddock peel activated carbon for capacitive deionization comprises the following steps: mixing shaddock peel powder and an acid reagent, and performing hydrothermal carbonization to obtain an intermediate product; and mixing the intermediate product with an activating reagent, and activating to obtain the shaddock peel activated carbon for capacitive deionization. The waste shaddock peel is subjected to hydrothermal carbonization and high-temperature activation to prepare the porous carbon with high porosity, the shaddock peel biochar has a large number of micropores and mesopores, the micropores provide abundant active sites for ion storage and diffusion, and the specific capacitance can be improved. The mesopores provide more channels for the transportation of electrolyte ions, and are beneficial to the improvement of the rate capability. The invention also provides an electrode material prepared from the shaddock peel activated carbon, the electrode material is used as a proper electrode for capacitive deionization, the adsorption capacity of a system is increased, and the electrode material has high cycle stability.

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.

The present invention belongs to the field of wastewater treatment technology, and specifically relates to a cascade treatment system and method for aquaculture wastewater based on photoelectrocatalytic degradation. The system includes: a solid-liquid separation device, a photoelectrocatalytic decomposition device, and a capacitive deionization device; the solid-liquid separation device is used to perform solid-liquid separation on aquaculture wastewater to obtain solid waste residue and waste liquid; the photoelectrocatalytic decomposition device is used to perform photoelectrocatalytic degradation on the waste liquid to remove organic matter in the waste liquid. The anode of the photoelectrocatalytic decomposition device is a composite photocatalyst, and the cathode is a modified activated biochar. The anode is used to catalytically degrade the organic matter in the waste liquid during photoelectrocatalytic degradation, and the cathode is used to provide active sites during photoelectrocatalytic degradation; the capacitive deionization device is used to remove charged particles from the waste liquid discharged from the photoelectrocatalytic decomposition device to remove organic matter. The system described in the present invention can be used to separate aquaculture wastewater with high turbidity step by step, achieving more efficient and energy-saving sewage degradation.

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 application discloses a method for growing cobalt-iron-lanthanum ternary hydrotalcite on carbon felt in situ to prepare a phosphorus removal electrode, and belongs to the technical field of electrode preparation of capacitive deionization. The ternary hydrotalcite cobalt-iron-lanthanum hydrotalcite is synthesized on commercial carbon felt by using a one-step hydrothermal method. The preparation method does not need to use a binder and a conductive agent, and can better expose active sites of active materials, so that the removal efficiency of phosphorus is improved, economic benefits are remarkable, and the method has a wide application prospect.

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 self-supporting composite electrode for CDI and a preparation method and application of the self-supporting composite electrode, and belongs to the technical field of capacitive deionization. The preparation method of the self-supporting composite electrode for CDI provided by the invention comprises the following steps: S1, mixing hypha suspension and preparation raw materials of an MOF material, and then carrying out solvothermal reaction; the preparation raw materials of the MOF material comprise a metal precursor and a ligand; s2, pyrolyzing and carbonizing the solid product obtained in the step S1. According to the preparation method provided by the invention, the self-supporting composite electrode with a good capacitive deionization effect can be obtained. The invention further provides the self-supporting composite electrode for the CDI prepared by the preparation method and application of the self-supporting composite electrode for the CDI.

The application belongs to the technical field of capacitive deionization desalination, and relates to an electrode felt for capacitive deionization and a preparation method thereof. The preparation comprises the following steps: dissolving PAN and acetylated lignin into a homogeneous spinning solution by using DMF and DMSO double solvents, and then electrospinning to obtain a carbon fiber precursor; then, under a nitrogen atmosphere, the precursor is subjected to pre-oxidation, carbonization and CO2 activation treatment; finally, the obtained material is subjected to acidification treatment to obtain the electrode felt for capacitive deionization with a high specific surface area. The method has a wide raw material source and low cost. The specific pre-oxidation, carbonization and carbon dioxide etching process are combined with each other, so that the prepared electrode felt has a high specific surface and a high capacitive deionization effect.

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 present invention belongs to the technical field of water pollution remediation, and particularly relates to a method for removing heavy metal pollutant chromium in water by using capacitive deionization technology, which comprises the following steps: clarifying the amount of raw water and the presence of chromium ions; adjusting the pH of the chromium-containing wastewater so that the chromium ions exist in an ideal form convenient for treatment; the chromium-containing wastewater enters a flow electrode membrane capacitive deionization device through a peristaltic pump, and after charging, a uniform electric field will be generated between the two electrode plates, and the target chromium ions will be enriched in this area; the voltage is set to be greater than the electrolysis voltage of water, and the adsorption and desorption processes are carried out simultaneously, and the desorption of the electrode will enrich the chromium ions in the flow electrode slurry, so as to achieve the purpose of chromium removal. The method of the present invention can well break through the voltage limitation, and at the same time utilize the Faraday reaction and the electrolysis reaction, simplify the operation steps of electrode regeneration, and achieve efficient removal of heavy metal pollutant chromium in water.

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 present invention belongs to the technical field of self-supporting thin film electrodes, and particularly relates to a self-supporting composite thin film, a preparation method thereof, and an application thereof. In the present invention, molybdenum disulfide, multilayer Ti3C2T x MXene, and graphene oxide are compounded to prepare a self-supporting composite thin film, which solves the problem that two-dimensional materials are prone to stacking. The constructed heterojunction structure has an extremely high adsorption specific capacity, which can reach 51.1 mg / g, and has a great adsorption rate. The self-supporting composite thin film provided by the present invention has good flexibility, toughness, and electrical conductivity, and is an ideal electrode material, especially suitable for the field of capacitive deionization technology, and has great application prospects in devices such as supercapacitors, lithium ion batteries, and sodium ion batteries.

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.