333 results about "Ion selectivity" patented technology

The invention discloses a screen cloth enhanced polybenzimidazole porous membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: fully mixing polybenzimidazole, a polar solvent and a template to obtain a mixed solution, coating a base material with the mixed solution, placing a polymer mesh on the previous base material, and carrying out in-situ compounding, polar solvent removal and film formation to obtain a compact mesh reinforced polybenzimidazole film; and then carrying out in-situ etching treatment to prepare the screen cloth enhanced polybenzimidazole porous membrane. The size and connectivity of ion channels in the membrane can be regulated and controlled by regulating and controlling the type and content of templates in the membrane casting process, and the polybenzimidazole porous layer can be ultrathin by combining the effect of enhancing the mechanical property of the polymer mesh cloth, so that the mass transfer resistance of the polybenzimidazole porous separation layer is remarkably reduced, and the performance of the membrane is improved. The mesh-reinforced polybenzimidazole porous membrane has good dimensional stability and pore uniformity, and has the characteristics of high ion selectivity, high ion conductivity and high stability.

The invention discloses a composite membrane with MXene directionally modified by alpha-cyclodextrin and a preparation method of the composite membrane, and belongs to the field of ion separation membrane materials, the composite membrane comprises MXene nanosheets and alpha-cyclodextrin; the MXene nanosheets are stacked layer by layer to form a sub-nano channel convenient for ions to pass through, and the alpha-cyclodextrin is connected to the end parts of the MXene nanosheets to form an interlayer channel inlet of the sub-nano channel; an interlayer channel inlet formed by alpha-cyclodextrin can select monovalent ions, the monovalent / divalent ion selectivity of the composite membrane exceeds 10 < 3 >, a sub-nano channel formed by MXene enables the monovalent ions to be transported smoothly, rapid transport of the monovalent ions is guaranteed, and the flux of the monovalent ions reaches 0.1 mol m <-2 > h <-1 >; therefore, the composite membrane provided by the invention can realize synchronous improvement of ion selectivity and ion flux; the structural stability of the composite membrane is improved, and the service life is prolonged.

The invention provides a heterostructure salinity difference energy conversion film based on HOF / two-dimensional mesoporous carbon as well as a preparation method and application of the heterostructure salinity difference energy conversion film. The salinity difference energy conversion film comprises a two-dimensional mesoporous carbon layer serving as a hydrophobic layer and a hydrogen bond organic framework layer which covers one surface of the hydrophobic layer and serves as a hydrophilic layer, wherein the two-dimensional mesoporous carbon layer is formed by compounding a two-dimensional mesoporous carbon material with regular nanopores and aramid nanofibers; the hydrogen bond organic framework layer is formed by compounding a hydrogen bond organic framework material and aramid nanofibers; the heterogeneous Janus structure salinity gradient energy conversion membrane is constructed by adopting a hydrogen bond organic framework and a two-dimensional mesoporous carbon material, and when the heterogeneous Janus structure salinity gradient energy conversion membrane is applied to salinity gradient energy conversion, high ion selectivity, high structural stability and high ion migration flux can be considered.

The invention belongs to the technical field of membranes, and discloses a monovalent / divalent cation selective separation membrane based on an intrinsic microporous polymer, and the preparation route of the membrane is as follows: taking an ether-free polymer synthesized by super acid catalysis as a precursor, introducing an ion exchange site into the polymer by utilizing grafting of a sulfonated monomer, and preparing the monovalent / divalent cation selective separation membrane based on the intrinsic microporous polymer. And improving the separation performance of monovalent ions / divalent ions by using an alkoxy chain graft with specific interaction on the monovalent ions, and greatly improving the mechanical strength of the membrane by using the interaction of hydrogen bonds between main and side chains, thereby finally obtaining the monovalent / divalent cation selective separation membrane. According to the present invention, the industrial production difficulty is significantly reduced by the full solvation reaction membrane synthesis route, the selectivity of the prepared membrane material is superior to the selectivity of the commercial membrane of the same type, the extremely high mechanical strength is maintained, and the large-scale production and application potential is provided.

The invention belongs to the technical field of high polymer materials, and particularly relates to a composite proton exchange membrane and a preparation method thereof. According to the prepared composite proton exchange membrane, the perfluorosulfonic acid resin capable of being industrially applied is selected as a base membrane material, and the modified polybenzimidazole polymer resin is added, so that the problem of high ion permeation rate of a perfluorosulfonic acid proton exchange membrane in the prior art is solved; interpenetration and permeation of the electrolyte in the use process of the perfluorosulfonic acid proton exchange membrane can be reduced, cross contamination of positive and negative electrolyte is greatly reduced, and the service life of the electrolyte is prolonged. The PBI is functionalized, so that the proton transmission capacity of the PBI is improved, and the proton exchange membrane formed by blending the functionalized PBI and the perfluorinated sulfonic acid resin can keep excellent vanadium resistance, excellent proton transmission capacity and relatively high ion selectivity at the same time. The preparation process is simple, and the prepared proton exchange membrane can meet the performance and long-term stability use requirements of a flow battery.

The invention relates to a crown ether-loaded solid bubble lithium adsorbent as well as a preparation method and application thereof, belongs to the technical field of lithium adsorption, and solves the problems of low adsorption rate, low adsorption capacity, poor ion selective adsorbability, complex synthesis process, difficulty in separation and recovery, poor regeneration capacity and water environment pollution during lithium extraction of an existing crown ether material. The method comprises the following steps: activating solid bubbles by adopting an alkaline solution; modifying the activated solid bubbles by using a coupling agent; and reacting a crown ether monomer with a lithium salt in a solvent, adding the modified solid bubbles, a catalyst, a cross-linking agent and an initiator, continuously reacting, carrying out solid-liquid separation, washing, drying and eluting. The method is simple and environment-friendly, the stably immobilized crown ether is introduced to the surface of the solid bubble through chemical grafting, and the lithium adsorption performance of the crown ether is improved; the solid bubbles with low density and high stability can endow the adsorbent with the self-floating characteristic, the regeneration performance of crown ether is remarkably improved, and pollution to the water environment is reduced.

The invention discloses an anionic surfactant and a preparation method and application thereof.The anionic surfactant has a double-wedge-shaped molecular structure, alkaline earth metal benzene sulfonate serves as a polar hydrophilic wedge tip, a long-chain alkoxy flexible chain segment serves as a hydrophobic wedge group, the surface tension of water can be remarkably reduced in an aqueous solution, and the anionic surfactant has excellent emulsifying capacity. The molecular structure is based on alkaline earth metal benzene sulfonate and has good thermotropic and lyotropic liquid crystallinity, the liquid crystal phase temperature range of the molecular structure exceeds 140 DEG C, and the phase transition temperature and the mesogenic state temperature range can be controlled by adjusting the number of carbon atoms of an alkoxy substituent. When in a mesogenic state, the molecules can form a supramolecular columnar phase through self-assembly aggregation, and the columnar structure can form a transmission channel with ion recognition in the column center direction. By utilizing the characteristic, a novel bionic ion selective conduction membrane can be constructed, and the biomimetic ion selective conduction membrane has wide application potential in the aspects of preparation of ion selective electrodes and chemical sensors and the like.

The invention relates to a method for simultaneously detecting fluorine and chlorine contents in lead concentrate by an ion selective electrode method, and belongs to the technical field of new material detection, and the method specifically comprises the following steps: (1) preparing a sample into a to-be-detected solution; (2) preparing a fluorine ion electrode standard solution and a chloride ion electrode standard solution; (3) calibrating a fluorine ion standard solution and a chloride ion standard solution; and (4) sample determination and data processing. According to the combined measurement method provided by the invention, through a layered coverage method, optimization of the ratio of potassium hydroxide to potassium nitrate and gradient temperature rise, on the premise of ensuring data quality, an accurate result is conveniently obtained; compared with a fluorine or chlorine testing method commonly used in the market, the method is short in time consumption, simple in equipment and accurate in data; in addition, the combined detection method provided by the invention breaks through the pH limit of traditional single ion detection, and provides a reliable solution for synchronous determination of fluorine and chlorine in a complex matrix sample.

The invention designs a sandwich structure composite system diaphragm with ion selectivity and multi-size screening to realize high-density and dendrite-free zinc deposition on the surface of a zinc negative electrode and spontaneously inhibit passivation / corrosion of the zinc negative electrode in the circulation process. According to the sandwich structure composite system, a traditional glass fiber diaphragm is used as a substrate, then bacterial cellulose is used as a middle layer, and finally a metal oxide Ti0. 87O2 nanosheet is used as a top layer, so that a macroscopic / microcosmic / molecular pore multi-size screening structure is formed, uniform deposition of zinc can be realized, growth of dendritic crystals can be inhibited, and the long cycle performance of the battery is effectively improved.

The invention discloses a microphase separation hydrogel electrolyte with ion selectivity and a preparation method and application thereof. The electrolyte is prepared by constructing a microphase separation polymer network composed of a polyanionic polymer and an ion exchange group-containing polymer in a synergistic manner and inducing crosslinking by using metal ions. The formation of a continuous ion transmission channel in the hydrogel is realized. The technical problem that high ionic conductivity and high ionic transference number are difficult to obtain at the same time in a traditional hydrogel electrolyte is solved, spatial unwrapping and selective coordination of a polymer chain segment are induced through a microphase separation structure, and directional construction of an ion channel is achieved; and the ion conductivity of the electrolyte is remarkably improved, and meanwhile, the target ion transference number is further improved. The prepared hydrogel electrolyte has high mechanical stability, high ion flux and excellent ion selectivity, and can be widely applied to high-performance electrochemical devices such as batteries.

Provided is an ion-selective membrane comprising a combination of plasticizers. The ion-selective membrane is used in ion-selective electrodes, sensors and analysers, and in a method for determining the concentration of components in a sample, in particular a blood sample.

The invention discloses a hierarchical pore UiO-66 supported crown ether composite material, a preparation method thereof and application of the hierarchical pore UiO-66 supported crown ether composite material in adsorption and extraction of 6Li < + > from complex systems such as salt lake brine. The preparation method comprises the following steps: preparing terephthalic acid, 2-aminoterephthalic acid and a zirconium source through a solvothermal method to obtain a mixed ligand UiO-66, and then pyrolyzing the mixed ligand UiO-66 in an air atmosphere to obtain the hierarchical pore UiO-66; the hierarchical pore UiO-66 and a crown ether solution are mixed and stirred to react for a period of time, then solid-liquid separation is carried out, solids are collected, and the hierarchical pore UiO-66 loaded crown ether composite material is obtained after cleaning and drying. The hierarchical pore UiO-66 loaded crown ether composite material has the advantages of high specific surface area, high dispersion of crown ether adsorption sites, high crown ether loading capacity, high selectivity of 6Li < + > metal ions and the like, and can realize one-step enrichment of 6Li < + > metal ions in complex systems such as salt lake brine.

The utility model discloses a special device for continuously preparing a monovalent ion selective ion exchange membrane. The special device comprises a first unwinding mechanism, a water tank, a first electro-deposition tank, a second electro-deposition tank, a spraying device, a second unwinding mechanism, a drying device, a first winding device, a washing tank and a second winding device which are sequentially arranged from left to right, the first unwinding mechanism is used for unwinding a dry anion exchange membrane; the second unwinding mechanism is used for unwinding the PET film; the first electro-deposition tank is an electro-deposition tank containing polyethyleneimine PEI, and the second electro-deposition tank is an electro-deposition tank containing sulfonic acid group polymers. According to the utility model, the continuous industrial production of the monovalent ion selective anion / cation exchange membrane can be realized, and the production cost and the labor intensity of the monovalent ion selective anion / cation exchange membrane are reduced.

The invention belongs to the technical field of ion exchange membranes, and relates to a composite membrane with a high ion selective catalytic function and a preparation method thereof. The composite membrane has a three-layer structure, namely a high-ion-selectivity base membrane doped with a microporous material and catalytic functional composite layers doped with a positive electrode catalyst and a negative electrode catalyst on two sides of the base membrane. The preparation method comprises the following steps: firstly, dissolving perfluorinated sulfonic acid resin in an organic solvent, then dividing the obtained solution into three parts, and respectively adding a microporous material, a positive electrode catalyst and a negative electrode catalyst into the three parts for dispersion; after concentration treatment, a step-by-step tape casting mode is adopted to sequentially prepare a high-ion-selectivity base membrane, a positive electrode catalytic function composite layer and a negative electrode catalytic function composite layer, and finally, the three layers are compounded to form the high-ion-selectivity catalytic function composite membrane. The prepared composite membrane endows the flow battery diaphragm with a catalytic function; through fusion of the catalyst and the diaphragm resin, the problem of catalyst shedding is solved, and the conductivity and the ion barrier ability of the diaphragm are improved at the same time.

This invention discloses a method and system for selective separation of monovalent and divalent ions in an alginate fiber coagulation bath based on electrodialysis, belonging to the field of fiber production and membrane separation technology. The method and system integrate a selective electrodialysis device into a traditional coagulation bath circulation system. Utilizing an ion exchange membrane with monovalent and divalent cation selectivity, sodium ions accumulated in the coagulation bath are selectively migrated and removed under the action of an electric field, while divalent metal ions are efficiently retained, thereby maintaining a stable molar ratio of divalent ions to sodium ions in the coagulation bath within the required process range. Compared to traditional methods, this invention eliminates the need for large-scale replenishment of divalent metal salts or full replacement solution, significantly reducing production costs and resource waste. It achieves online regeneration and continuous circulation of the coagulation bath, significantly improving production stability, fiber quality, and resource utilization efficiency, and is suitable for the green and efficient production of various alginate fibers.

The present application relates to a kind of ultra-thin b orientation ZSM-5 zeolite molecular sieve membrane, preparation method and application in vanadium oxidation liquid flow battery, belong to liquid flow battery technical field. Low defect density, thin and [0k0] plane out orientation ZSM-5 zeolite separation membrane made of zeolite nanosheet realizes enhanced ion selectivity and ion conductivity, so as to improve battery performance. Therefore, VFB equipped with ZSM-5 zeolite membrane shows excellent vanadium resistance, self-discharge time reaches 116.2 hours, far more than Nafion 212 (45.9 hours). In addition, under 80mA cm ‑2 Current density, the performance of VFB remains stable in 1000 cycles.

This invention discloses an interlayer confined piezoelectric composite film of graphene oxide, its electric field-driven preparation method, and its application. The preparation method includes: preparing a graphene oxide dispersion using the Hummers method and filtering it to form a graphene oxide film; placing the graphene oxide film in an electric-driven device, introducing different precursor solutions on both sides of the film, and driving the precursor components to migrate into the interlayer confined space of the graphene oxide under the action of an applied electric field; under the synergistic effect of electric field driving and interlayer confinement, the precursors entering the interlayer react and crystallize in situ to form a piezoelectric functional phase. The prepared composite film can generate piezoelectric polarization under mechanical stimulation conditions and can be used for ion selective adsorption / separation, especially suitable for the selective adsorption / separation of uranium and vanadium ions in high-salt water systems. This invention achieves a synergistic improvement in interfacial charge regulation and ion selectivity regulation by constructing a piezoelectric functional phase in situ within the interlayer confined space of graphene oxide.

The utility model discloses a uniform mixing mechanism of high-temperature-resistant lithium ion selective adsorbent slurry preparation equipment, which relates to the field of chemical agent production equipment and comprises a device main body, a plurality of first mixing boxes are arranged at the top in the device main body, and a plurality of second mixing boxes are arranged below the first mixing boxes in the device main body. The second mixing box is arranged at the bottom junction of the first mixing box, and a first one-way valve is arranged at the bottom of the first mixing box and communicated with the interior of the device body. During slurry preparation, materials respectively enter the first mixing box, and then flow into the mixing device according to material characteristics and chemical reaction requirements. The grading premixing optimizes material combination, promotes full chemical reaction, enables the performance of the adsorbent to be more stable, remarkably reduces the defective rate, improves the overall quality of the high-temperature-resistant lithium ion selective adsorbent from the source, and provides more reliable product guarantee for downstream application.

The invention belongs to the technical field of electrochemical sensors, and relates to an electrochemical sensor for detecting the ion content in urine by taking ZIF-8 as a center, a detection method and an antibacterial catheter. An electrode array is arranged in the electrochemical sensor and comprises a working electrode, a counter electrode and a reference electrode; the working electrode comprises a ZIF-8 modified carbon electrode, and the electrode is prepared by coating a flexible substrate containing a carbon electrode with turbid liquid containing a ZIF-8 composite porous sensitive material and then drying. The ZIF-8 composite porous sensitive material is prepared by in-situ synthesis on a polyvinyl chloride material containing hydroxyl or carboxyl through a one-step method. When the sensor is used for ion detection, the anti-interference performance is high, the sensitivity is high, the ion selectivity is high, and the concentration of ions such as K < + >, Na < + > and Cl <-> in urine can be monitored for a long time under soaking. When the catheter loaded with the sensor is used for urine drainage of a patient, ions in urine can be detected in real time, and the sensor has lasting antibacterial performance.

The invention provides an ion selective membrane, a preparation method thereof and a method for synchronously recovering resources and energy in neutralization reaction. The ion selective membrane takes a two-dimensional nano material as a main body skeleton, one-dimensional nano materials are doped in the main body skeleton, and the one-dimensional nano materials and the one-dimensional nano materials as well as the one-dimensional nano materials and the two-dimensional nano materials are cross-linked through a cross-linking agent; the two-dimensional nano material is MXene, graphene oxide, molybdenum disulfide, vermiculite, a two-dimensional metal organic framework material or a two-dimensional covalent organic framework material; the one-dimensional nano material is sodium carboxymethyl cellulose, sodium hydroxy propyl cellulose or aramid nano fiber. The ion selective membrane enables H < + > to selectively pass through and coexisting ions such as Na < + > and the like not to pass through, so that the ion selective membrane can be used for power generation in an acid-base neutralization reaction, chemical energy is converted into electric energy, water and a salt solution are respectively obtained in an acid chamber and an alkali chamber, and resources and energy are synchronously recycled.

This invention provides a covalent organic framework hybrid matrix membrane, its in-situ growth method, and its application in ion separation. The method includes: dissolving cellulose derivatives, aldehyde monomers of covalent organic frameworks, and amine monomers of covalent organic frameworks in an organic solvent to obtain a first solution, a second solution, and a third solution; mixing acetic acid solution with the first, second, and third solutions to obtain a homogeneous casting solution; and drop-coating the homogeneous casting solution for in-situ growth. This invention constructs a CD@COF hybrid matrix membrane based on a cellulose derivative matrix and a low-loading covalent organic framework filler using an in-situ growth method. The prepared hybrid matrix membrane exhibits good interfacial compatibility between the matrix and the filler. The above-mentioned hybrid matrix membrane preparation process is simple, possesses good mechanical strength and high scalability, and demonstrates high ion flux and excellent ion selectivity for separating monovalent and divalent ions. It has broad application prospects in wastewater resource treatment, lithium extraction from salt lakes, and energy storage.

An apparatus (100) for producing an acidic aqueous solution includes: an electrodialyzer (110) that has a monovalent ion perm-selective ion-exchange membrane and separates wastewater containing chloride ions and alkali metal ions into electrodialysis concentrated water and electrodialysis diluted water by an electrodialysis treatment; an electrolyzer (120) includes an anode that that electrolyzes the electrodialysis concentrated water to produce an acidic aqueous solution; and a first circulator (13) that circulates at least some of the acidic aqueous solution to the wastewater supplied to the electrodialyzer (110), and that adjusts a pH of the wastewater supplied to the electrodialyzer to 3 to 9.

The invention belongs to the technical field of macromolecular functional materials and electrochemical energy storage, and particularly relates to a polymer composite membrane with a dual-channel proton blocking function and application of the polymer composite membrane in a metal battery. The polymer composite membrane with the dual-channel proton blocking function is formed by compounding polyvinyl alcohol and zwitter-ion modified polypyrrole, and is an ion selective composite membrane capable of blocking proton transmission through dual channels and realizing efficient selective conduction of Zn < 2 + >. The hydrophilic-hydrophobic composite membrane inhibits proton dual-channel migration, keeps Zn < 2 + > high-efficiency conduction, has asymmetric wettability, has a contact angle facing an electrolyte side of 100-110 degrees and a contact angle facing a metal negative electrode side of 70-80 degrees, guarantees interface water resistance, promotes Zn < 2 + > interface transmission, and overcomes the technical defects of the existing hydrophilic-hydrophobic composite membrane.

This invention discloses a bipyridine derivative for the separation of lanthanum and actinide and its preparation method, belonging to the field of organic synthesis technology. The method first dissolves bipyridine OSU in DMSO, then adds it to a reaction solution, and stirs at room temperature to obtain a homogeneous solution. Next, a crystallization solvent is slowly added to the mixed solution, and the precipitated crystals are sequentially filtered, washed, and dried to obtain the bipyridine derivative. The bipyridine derivative is 6,6'-bis(N-hydroxyethylformyl)-2,2'-bipyridine or 6,6'-bis(N-hydroxybutylformyl)-2,2'-bipyridine. The target product synthesized by this method has good solubility in water, effectively improving the product's dispersibility. After complete dissolution, the product exhibits significant actinide ion selectivity due to the presence of a soft coordinating atom N in the ligand molecule, which allows it to complex with trivalent actinide ions more strongly than trivalent lanthanide ions.

Disclosed herein are anolytes comprising alkanolamine-base ligands and an iron-ion component. Also disclosed herein is a redox flow battery system comprising an anolyte comprising the alkanolamine-based ligand of the present disclosure, a catholyte; and an ion selective membrane disposed between the catholyte and anolyte. Also disclosed herein are methods of making and using the anolyte disclosed herein.

This invention relates to the field of ion-conducting membrane technology, and particularly to a wedge-shaped amphiphilic molecule, a biomimetic ion-conducting membrane, and its preparation method. The biomimetic ion-conducting membrane utilizes the self-assembly behavior of the wedge-shaped amphiphilic molecule to form a columnar mesocrystalline phase containing transport channels. This columnar structure is fixed within a membrane framework composed of methacrylate polymers using ultraviolet graft copolymerization to form an ion-transfer membrane. This membrane exhibits strong ion selectivity and conductivity, and its mechanism of action is similar to that of biological cell membranes. It can be used for the transport and separation of microparticle materials such as ions, small molecules, and micro-electronic conductors, showing broad application prospects in fields such as biology, medicine, and environmental analysis. Furthermore, its ion conductivity and chemical stability also demonstrate its potential application in proton exchange membrane fuel cells.

This invention belongs to the field of potentiometric antifouling sensors, specifically relating to a humic acid-resistant polymer membrane ion-selective electrode, its preparation, and its application. The selective electrode consists of a polymer sensitive membrane and a protective layer sequentially adhered to the bottom of an electrode substrate; the protective layer is a polyvinylidene fluoride (PVDF) coating. This invention utilizes the low surface energy, high electronegativity, and dense film formation properties of the PVDF coating to reduce the wetting and adhesion of humic acid on the electrode membrane surface, while effectively preventing it from penetrating the polymer membrane, thereby improving the stability and service life of the polymer membrane ion-selective electrode in complex aquatic environments.

The invention relates to the technical field of inorganic salt mother liquor treatment, in particular to an inorganic salt mother liquor recycling system based on MVR evaporative crystallization, which comprises three groups of sedimentation tanks and separation cylinders fixedly communicated with the bottoms of the sedimentation tanks, stirring components and sealing conical seats are arranged in the separation cylinders, and the tops of the sedimentation tanks are connected with liquid storage hoppers through liquid inlet pipes. An electromagnetic control valve is arranged on the liquid inlet pipe, and a calcium hydroxide solution, a sodium carbonate solution and a barium chloride solution are sequentially arranged in the multiple liquid storage hoppers from left to right; through staged treatment of the three groups of sedimentation tanks, the ion selective electrode sensor and the controller are combined to precisely add corresponding agents, the hetero ions are removed step by step in a targeted manner, and the subsequent progressive deep purification treatment is matched, so that a high-quality water quality basis is provided for efficient recycling of the mother liquor; and the problems of crystal quality reduction, equipment scaling and the like caused by hetero-ion enrichment are effectively avoided.

The invention belongs to the field of selective adsorbents, and particularly relates to a rubidium and cesium ion selective adsorbent based on a graphene composite material and application thereof.The rubidium and cesium ion selective adsorbent is prepared by conducting surface carboxyl activation and crown ether grafting on the surface of a three-dimensional cross-linked graphene skeleton to obtain a crown ether functionalized graphene composite material; and performing in-situ growth of copper ferrocyanide nanoclusters on the crown ether functionalized graphene composite material. The rubidium cesium ion selective adsorbent realizes efficient selective adsorption of Rb < + > and Cs < + >, reaches adsorption equilibrium within 30 min in simulated high-level liquid waste, has Cs < + > and Rb < + > saturated adsorption capacities of 185 mg / g and 142 mg / g respectively, and has excellent acid-base stability and electrochemical regeneration capacity.

This invention provides a multi-channel structure for a rapid, highly selective water-voltaic ion sensor, its fabrication method, and its applications. The sensor comprises a multi-channel sandwich-structured fiber membrane, a gradient polarization interface, and an electrode assembly. The multi-channel sandwich-structured fiber membrane includes a first macroporous layer, an intermediate microporous layer, and a second macroporous layer stacked sequentially, dividing the membrane into multiple independent sensing channels on a plane. The gradient polarization interface exhibits different degrees of interface polarization in different sensing channels. The electrode assembly connects to both ends of each sensing channel. The rapid, highly selective water-voltaic ion sensor provided by this invention utilizes a sandwich structure to form ion transport channels with rapid transport at both ends and precise sieving in the middle. This allows for the synergistic enhancement of both rapid ion transport and high-sensitivity response. Furthermore, by constructing differentiated sensing channels with "identical structures but different interfaces," the sensor synergistically amplifies and identifies differences in the intrinsic properties of ions, significantly improving ion selectivity.