221 results about "Monovalent Cations" patented technology

The invention belongs to the field of cation exchange membranes, and discloses a monovalent selective cation exchange membrane with crown ether encapsulated in the membrane and a preparation method of the monovalent selective cation exchange membrane. Firstly, a sulfonated chloromethylated polymer is synthesized, a solvent is evaporated to form a membrane, and a chemical reaction of chloromethyl and amido contained in the membrane endows a growth site of a covalent organic framework. And then constructing a covalent organic framework in a membrane channel by an in-situ growth method, and packaging the crown ether nano material in the membrane. A regular porous channel of the covalent organic framework and a sulfonic acid group in the base membrane have a synergistic effect, so that good ion flux of monovalent ions is ensured. Meanwhile, the crown ether structure has a special recognition complexing effect on alkali metal ions and has different affinity to different metal ions, so that the monovalent cation selective separation is achieved, and the prepared monovalent selective cation exchange membrane is suitable for an electrodialysis process.

In an embodiment a method includes a) providing an aqueous solution of a carbon dioxide absorption agent, wherein the carbon dioxide absorption agent comprises cations of the 1st main group of the periodic table, b) passing an air flow containing carbon dioxide through the aqueous solution of method step a), wherein at least a part of the carbon dioxide from the air flow is bound to the carbon dioxide absorption agent and the air flow is depleted in carbon dioxide and c) introducing the aqueous solution of method step b) or an aqueous solution including the carbon dioxide bound to the carbon dioxide absorption agent into a middle chamber of an at least three-chamber electrolysis cell, wherein the three-chamber electrolysis cell includes a membrane selective for monovalent cations, and electrolyzing the aqueous solution of method step b) or the aqueous solution comprising the carbon dioxide bound to the carbon dioxide absorption agent under release of at least a part of the carbon dioxide.

The invention relates to a method for generating a perovskite in-situ film through assistance of an interface protonation reaction, and the method comprises the following steps: S1, spin coating: carrying out the spin coating of a perovskite precursor solution on an acidic substrate, and forming a complex intermediate phase; the perovskite precursor solution comprises a tin halide, a monovalent cation halide, thiocyanate and an ethylenediamine derivative; s2, annealing: heating and annealing the intermediate phase of the complex on a heating stage, and inducing conversion of the intermediate phase of the complex to the tin-based perovskite thin film through a protonation reaction between the acidic substrate and the ethylenediamine derivative; the chemical structure of the tin-based perovskite is ASnX3. According to the method, the protonation reaction of the acidic substrate and the perovskite interface is utilized to assist in generating high-quality perovskite, the morphology of the thin film is effectively improved, and a high-brightness PeLED device is further prepared.

The invention relates to the technical field of solar cells, in particular to a perovskite precursor solution, a perovskite solar cell and a preparation method of the perovskite solar cell. The perovskite precursor solution comprises a perovskite material, an additive and an organic solvent; wherein the additive comprises a compound containing pyrrolyl and carboxyl; the perovskite material is of an ABX3 structure, wherein A is a monovalent cation; b is a divalent cation including lead; and X is a monovalent anion. According to the application, the additive can be used for adjusting the film-forming crystallization process of perovskite, carboxyl of the additive and a perovskite material can form an intermediate, film-forming crystallization is delayed, the compactness and uniformity of a thin film are improved, and the film-forming quality is improved; in the large-area coating process, the solution fluidity is low, the time window is lengthened, and the film can grow uniformly; and the pyrrolyl has unsaturated nitrogen atoms, so that free Pb in the perovskite can be passivated, a passivation effect is achieved, and the performance of the device is improved.

The invention discloses a crown ether cation selective separation membrane and a preparation method thereof. The preparation method comprises the following steps: carrying out super acid catalysis on dibenzo-18-crown-6, terphenyl and isatin in dichloromethane to synthesize a precursor; carrying out affinity substitution reaction on the precursor and a flexible side chain with an ion exchange group through a pre-modification method to obtain a functional precursor; dissolving the functionalized precursor in an organic solvent to form a film casting solution, coating on a glass plate, and heating to volatilize the solvent so as to form a film through curing; and taking down the membrane from the glass plate, acidifying in an acidic aqueous solution, washing with deionized water, and extracting with deionized water to obtain the crown ether cation selective separation membrane. The crown ether cation selective separation membrane has the advantages of relatively high mechanical strength, physical and chemical stability and the like. Meanwhile, the crown ether cation selective separation membrane shows performance superior to that of a commercial membrane in the field of monovalent cation separation, and has wide application prospects in the fields of TMAH purification, salt lake lithium extraction, seawater salt extraction and the like.

The invention relates to a preparation method and application of surface passivation red light perovskite quantum dots, and the preparation method comprises the following steps: preparing a monovalent cation precursor from cesium carbonate, oleic acid and 1-octadecene; preparing a lead source precursor from the thiophene-sulfonamide ligand, lead halide, zinc halide, oleylamine, oleic acid and 1-octadecene; thermally injecting the monovalent cation precursor into the lead source precursor, and cooling to prepare a perovskite quantum dot solution; performing anti-solvent purification on the perovskite quantum dot solution to obtain surface passivation red light perovskite quantum dots; the invention also discloses application of the surface passivation red light perovskite quantum dot prepared by the preparation method in preparation of an electroluminescent diode. According to the invention, the purpose of preparing the halogen perovskite quantum dot with excellent optical performance, good stability and excellent performance of the prepared electroluminescent diode is achieved.

The invention provides a method for recovering nitrogen and phosphorus in wastewater through self-driven bipolar membrane electrodialysis. A system used in the method takes a magnesium negative electrode as a positive electrode and an air electrode as a positive electrode, and a self-driven primary battery is formed through wire connection; and ion exchange membranes with specific sequences are sequentially arranged between the two electrodes to form eight chambers, namely an anode chamber, a nitrogen and phosphorus recovery chamber, a wastewater chamber, a metal ion chamber, an ammonia water chamber, a hydrochloric acid chamber, a buffer chamber and a cathode chamber. During operation, an external power supply is not needed, and ion migration is driven by a self-generated electric field: after Mg < 2 + > and PO4 < 3-> are enriched in the nitrogen and phosphorus recovery chamber and NH4 < + > and Ca < 2 + > migrate to the metal ion chamber, NH4 < + > enters the ammonia water chamber through the monovalent cation exchange membrane, and Ca < 2 + > is separated out and reacts with OH <-> generated by the bipolar membrane to generate Ca (OH) 2 precipitate, so that membrane blockage is effectively prevented, and finally, NH4 < + >, Mg < 2 + > and PO4 < 3-> react to generate high-purity struvite. Zero energy consumption of nitrogen and phosphorus recovery of the wastewater is achieved, no additional chemicals exist, anti-blocking operation is achieved, and both environmental benefits and resource benefits are achieved.

The present invention relates to a monomer composition comprising at least one functionalized thiophene monomer having the structure (I) wherein X1 and X2, independently of each other, represent O or S; x3 represents-CH2-O-in which a carbon atom is bonded to R1, or represents-O-; r1 represents a trivalent organic group; r2 represents a divalent organic group; m1 represents a monovalent cation; wherein the monomer composition is substantially free of an unsaturated organic sulfonic acid having the structure (II) wherein R3 represents a divalent organic group; m2 represents a monovalent cation; or wherein the monomer composition comprises an unsaturated organic sulfonic acid having the structure (II) in a maximum amount such that the molar ratio of the total amount of unsaturated organic sulfonic acid having the structure (II) to the total amount of functionalized thiophene monomer having the structure (I) is 1: 32 or less. The invention also relates to a process for the preparation of functionalized pi-conjugated polythiophenes, the functionalized pi-conjugated polythiophenes obtainable by this process, polymer compositions comprising functionalized pi-conjugated polythiophenes, a process for the preparation of lamellar bodies, lamellar bodies obtainable by this process, and methods for the preparation of functionalized pi-conjugated polythiophenes. And the use of the monomer composition or the polymer composition according to the invention for producing an electrically conductive layer in an electronic device. # imgabs0 #

The invention discloses a preparation method of a cation selective separation membrane for ion separation, which comprises the following steps: selecting a PNA polymer with pi-pi interaction, hydrogen bond and microporous network structure as a precursor of a membrane material, and introducing a sulfonated side chain into a membrane matrix to construct an efficient ion exchange site; and by introducing an alkoxy chain to promote high-efficiency transmission of the monovalent cations, a dense network structure is formed through ultraviolet crosslinking after the homogeneous membrane liquid is coated and dried, and the transmission channel of the monovalent cations is further optimized. The efficient and convenient one-pot ternary polymerization technology is adopted, the synthesis steps of the membrane material are simplified, the production efficiency is improved, the uniformity of the product is ensured, the prepared separation membrane shows high ion flux and ion selectivity in electrodialysis application, and the separation membrane can be applied to electrodialysis. The method has huge application potential and market prospect in the industrial fields of salt lake lithium extraction, chlor-alkali industry, waste acid treatment and the like.

The invention discloses a UiO-66-based monovalent cation selective separation membrane as well as a preparation method and application thereof, and belongs to the technical field of membrane separation. The preparation method comprises the following steps: mixing a zirconium n-propoxide solution with n-propyl alcohol, glacial acetic acid and DMF (Dimethyl Formamide) to prepare a zirconium cluster solution; performing oxygen plasma etching and acrylic acid grafting pretreatment on the BPPO base film to obtain a BPPO / CA film; finally, the BPPO / CA membrane, a zirconium cluster solution, terephthalic acid and triethylamine are subjected to an original growth reaction in a two-chamber reaction tank, and the UiO-66-based monovalent cation selective separation membrane is prepared. The preparation method provided by the invention is simple and mild in condition, and the prepared membrane has good cation selectivity and is suitable for the fields of industrial-grade TMAH solution purification and the like.

The invention discloses a monovalent selective cation exchange membrane containing a covalent organic framework modified layer as well as a preparation method and application of the monovalent selective cation exchange membrane. The preparation method comprises the following steps: (1) dissolving an ethidium bromide monomer and a catalyst in deionized water to obtain a water-phase solution; (2) dissolving an aldehyde monomer in an organic solvent to obtain an organic phase solution; and (3) immersing the sulfonated polyetheretherketone base membrane into the water phase solution, taking out the sulfonated polyetheretherketone base membrane, blow-drying water drops on the surface of the membrane, then immersing the sulfonated polyetheretherketone base membrane into the organic phase solution, taking out the sulfonated polyetheretherketone base membrane, and naturally airing to obtain the monovalent selective cation exchange membrane containing the covalent organic framework modified layer. The invention provides application of the monovalent selective cation exchange membrane containing the covalent organic framework modified layer in electrodialysis separation of monovalent and multivalent cations. Under the condition of ensuring that monovalent ions of the membrane have relatively high permeation flux, the membrane surface resistance is small, the tensile strength of the membrane is improved, the water absorption rate of the membrane is reduced, and the monovalent and multivalent selectivity of the membrane is remarkably improved.

The invention discloses a preparation method and application of a monovalent cation selective membrane for efficient lithium-magnesium separation, and belongs to the technical field of preparation of cation selective membranes. The monovalent cation selective membrane is composed of a polyamide nanofiltration base membrane and a polyethyleneimine positive electricity layer, and the preparation method comprises the following steps: taking piperazine anhydrous as a water phase concentration and trimesoyl chloride as an oil phase monomer, reacting on a polyethersulfone ultrafiltration base membrane, and preparing the polyamide nanofiltration base membrane by utilizing an interfacial polymerization method; and anchoring on the surface of the polyamide nanofiltration base membrane by utilizing cross-linking of gallic acid and PEI with the molecular weight of about 70000 through a multi-layer deposition method to obtain the Gallic-PEI / polyamide composite membrane with the positively charged surface. The membrane can realize lithium-magnesium separation through pore size screening and electrostatic repulsion effect, and has high lithium-magnesium selectivity while maintaining large lithium ion flux in the application process of an electrodialysis system, so that the lithium-magnesium separation effect of salt lake brine is improved.

The invention relates to a preparation method of surface-passivated red-light perovskite quantum dots, which comprises the following steps: preparing an amine sulfate solution from primary amine, sulfuric acid and an organic solvent; preparing a monovalent cation precursor from at least one of cesium carbonate, methylamine and formamidine, oleic acid and 1-octadecene; preparing a lead source precursor from lead halide, zinc halide, oleylamine, oleic acid and 1-octadecene; and thermally injecting the monovalent cation precursor into the lead source precursor, cooling, and injecting an amine sulfate solution to prepare a surface passivation red light perovskite quantum dot solution. The purpose of preparing the halogen perovskite quantum dots with excellent optical performance and good stability is achieved.

To provide a light emitting particle excellent in stability to water, light, and heat and including a nanocrystal and a method for producing the same, an ink composition including the light emitting particle and a phototransformation layer including a cured product of the ink composition, and a color filter provided with the phototransformation layer and a wavelength conversion film.SOLUTION: A light emitting particle comprises a surface layer including a structure having a siloxane linkage on a surface of a semiconductor nanocrystal composed of a metal halide, where the surface layer includes a salt having a univalent cation, the semiconductor nanocrystal is composed of a compound represented by a general formula AaMbXc, the A represents a specific cation, the M represents a specific metal ion, the X represents one or more halide ions selected from the group consisting of F, Cl, Br, and I, a represents a positive number of 1 to 7, b represents a positive number of 1 to 4, and c represents a positive number of 1 to 16.SELECTED DRAWING: None

The invention discloses a perovskite material, a solar cell, a preparation method, electric equipment and power generation equipment, the general formula of the perovskite material is M < x > FA < y > A < 1-x-y > B < X > 3, and M comprises monovalent cations containing an N element; fA is a formamidine cation; a comprises at least one of inorganic or organic monovalent cations, B comprises at least one inorganic divalent cation, and X comprises at least one inorganic monovalent anion. According to the embodiment of the invention, the perovskite material containing formamidine cations is doped and improved through the monovalent cations containing the N element, and the stability of the corresponding perovskite solar cell is improved.

The invention relates to a double-coordination passivated red-light perovskite quantum dot and a preparation method and application thereof. The preparation method comprises the following steps: preparing a monovalent cation precursor from cesium carbonate, 1-octadecene and oleic acid; preparing a lead source precursor from lead halide, zinc halide, 1-octadecene, diisooctyl hypophosphorous acid and oleylamine; thermally injecting the monovalent cation precursor into the lead source precursor, and cooling to prepare a perovskite quantum dot solution; performing anti-solvent purification on the perovskite quantum dot solution to obtain red light perovskite quantum dots; a process of preparing a double-coordination passivated red light perovskite quantum dot from the red light perovskite quantum dot and taurosulfonamide hydrochloride; the invention also discloses an application of the double-coordination passivated red light perovskite quantum dot prepared by the preparation method in preparation of an electroluminescent diode. The post-treatment passivation operation method is simple and convenient, and the quantum dot treated by the double-coordination ligand achieves the purpose of preparing the halide perovskite quantum dot with excellent optical performance and excellent performance of the prepared electroluminescent diode.

The invention relates to a layered silicate having interlayer cations, wherein the interlayer cations comprise a) inorganic monovalent cations comprising at least one of Na+, K+, and Li+, and b) organic cations comprising at least one protonated amino acid.

A biological sample preservative contains 1.0 to 10.0 mol / L of a substance having a polyatomic monovalent cation represented by a chemical formula NH4+ or a compound comprising the polyatomic monovalent cation. As the substance having the polyatomic monovalent cation represented by the chemical formula NH4+ or the compound comprising the polyatomic monovalent cation, for example, ammonium sulfate or ammonium nitrate can be used.

The invention discloses a monovalent cation selective separation membrane and a preparation method thereof, and belongs to the technical field of ion exchange membranes. The preparation method comprises the following steps: respectively dissolving a diamine monomer and an acyl chloride monomer in water and n-hexane to respectively obtain a water-phase solution and an oil-phase solution; fixing the porous base membrane in the middle of a central channel of a diffusion device, respectively pouring the water-phase solution and the oil-phase solution into diffusion chambers on the upper side and the lower side of the central channel, carrying out diffusion interface polymerization, taking out the membrane, washing with n-hexane, and drying to obtain the monovalent cation selective separation membrane. The preparation method of the monovalent cation selective separation membrane provided by the invention has the advantages of cheap raw materials, mild preparation conditions, simple operation and the like, so that the membrane preparation cost can be greatly reduced, and the existence of chloromethyl on the membrane makes the polyamide structure more stable. Meanwhile, the electrodialysis Na < + > / Me4N < + > and K < + > / Me4N < + > separation of the prepared monovalent cation selective separation membrane shows performance superior to that of a commercial CIMS membrane, and the monovalent cation selective separation membrane has wide application prospects in the fields of electronic-grade TMAH purification preparation and the like.

Provided is an organopolysiloxane represented by formula (1) which is excellent in terms of the property of dispersing silicone oils and the like and dispersing particles and attains excellent long-term dispersion stability, wherein, when the organopolysiloxane is contained in a cosmetic preparation, the cosmetic preparation exhibits satisfactorily spreadability and blendability with the skin, no limitations on silicone oil content, and excellent long-term stability. [In the formula, R1 moieties are each independently a monovalent organic group selected from among C1-C20 alkyl groups, C6-C15 aryl groups, C7-C15 aralkyl groups, and -Q-O-R4; R2 is a hydroxystearic acid derivative represented by formula (2) (wherein X represents a hydrogen atom or a monovalent cation, n is 2-22, and m is 1-20); and a is 0-100, b is 0-10, c is 0-5, d is 0 or greater, e is 0 or greater, and f and g are numbers satisfying f+g=2+d+e×2, with the proviso that both b and g are not 0].

The present application relates to a method for preparing a perovskite layer and a photovoltaic device, the method comprising: a) forming a first solid layer on a substrate from a first precursor material; the first precursor material comprising at least one divalent inorganic cation B, at least one monovalent cation A and halide anions X; b) treating the first solid layer with a second precursor solution to form the perovskite layer, wherein the second precursor solution comprises at least one monovalent cation A, halide anions X and SCN ‑ The present application enables to control the perovskite film formation process, to optimize the grain size and especially to enhance the growth of the perovskite layer on a textured morphology by adding a thiocyanate compound, in particular a mixture of methylammonium chloride (MACI) and methylammonium thiocyanate (MASCN) in the second step of a two-step process.

The embodiment of the invention discloses an adhesive and a preparation method thereof, a negative pole piece and a sodium ion battery, the structural formula of the adhesive is shown in the specification, R1 is a monovalent cation, R2 is an alkyl group with a carbon atom number of 1-6, R3 is an alkyl group or alkoxy group with a carbon atom number of 1-5, and n is 3-5. By introducing a long carbon chain into a polyacrylic acid main chain, the glass transition temperature of the polyacrylic acid can be reduced, the flexibility of the polyacrylic acid can be improved, and when the polyacrylic acid is applied to a negative pole piece, the flexibility of the negative pole piece can be improved.

Disclosed in the present application are a perovskite material, a solar cell, a preparation method therefor, an electrical device and power generation equipment. The general formula of the perovskite material is MxFAyA1-x-yBX3, M+ being a N-containing monovalent cation, FA+ being formamidinium, A being at least one of inorganic or organic monovalent cations, B being at least one inorganic divalent cation, and X being at least one monovalent anion. The embodiment of the present application dopes a formamidinium-containing perovskite material with a N-containing monovalent cation so as to improve same, thus improving the stability of corresponding perovskite solar cells.

The method for producing an aromatic polysulfone has a step for reacting an aromatic polysulfone precursor with a compound represented by (A). The aromatic polysulfone precursor has a repeating unit including a structure represented by formula (S-1) in the main chain and has a halogen atom at a main chain end. The step is carried out in an aprotic organic solvent in the presence of an alkali metal salt and a phase transfer catalyst. -ph1-SO2-ph2-O- … (S-1) [ph1, ph2: optionally substituted phenylene group] (Ra)x-Ar-OM … (A) [Ar: optionally substituted aromatic hydrocarbon group. Ra: one or more polar groups selected from the group consisting of acidic groups having a pKa equal to or less than the pKa of a carboxy group, salts of the acidic groups, and functional groups containing a nitrogen atom. x: integer of 1 or more. M: hydrogen atom or monovalent cation ]

The invention relates to a solar cell, a preparation method thereof and a photovoltaic module. The preparation method of the solar cell comprises the following steps: heating and melting divalent cation halide at a first temperature to enable the divalent cation halide to be in a solid-liquid mixed state; cooling the divalent cation halide to a second temperature, wherein the second temperature is the lowest temperature capable of keeping the divalent cation halide in a solid-liquid mixed state; at a second temperature, evaporating the divalent cation halide on the substrate to prepare a skeleton layer; and coating a monovalent cation solution on the skeleton layer, and annealing to prepare the perovskite layer. According to the preparation method of the solar cell, the film forming quality of the perovskite film can be improved while the evaporation rate of the framework layer is improved, and then the photoelectric conversion efficiency of the cell is improved.

The present invention provides a chemical mechanical polishing composition and a chemical mechanical polishing method, which can polish semiconductor substrates containing conductive metals such as tungsten and cobalt at high speed and flatness, and can reduce surface defects after polishing. The chemical mechanical polishing composition of the present invention contains: (A) silica particles containing functional groups represented by the following general formula (1); and (B) a silane compound. ‑ M + ·····(1)(M + represents a monovalent cation).

The application relates to the technical field of solar cell materials, in particular to a perovskite film, a preparation method thereof and a perovskite solar cell. The preparation method of the perovskite film comprises the following steps: preparing a divalent inorganic salt aqueous solution, wherein the divalent inorganic salt in the divalent inorganic salt aqueous solution is an inorganic salt corresponding to a divalent cation pair of the perovskite; performing film forming treatment on the divalent inorganic salt aqueous solution to obtain a divalent inorganic salt film; soaking the divalent inorganic salt film in a methyl halide ammonium solution for soaking treatment; coating a solution containing a formamidine halide salt on the divalent inorganic salt film after drying; and performing annealing treatment to obtain a perovskite film containing an organic-inorganic hybrid perovskite; wherein the methyl halide ammonium solution contains a linear alkyl halide ammonium with 2-5 carbons. The application can make the monovalent cations in the perovskite film uniformly distributed, so that the perovskite film shows a larger grain size, a lower charge trap density and a longer carrier lifetime, and can be well used in a solar cell.

The invention provides a light generating system (1000) comprising a first light generating device (110) and a control system (300), wherein the first light generating device (110) comprises a first solid state light source (10), a second solid state light source (20), and a luminescent converter (2000), wherein: (A) the first solid state light source (10) is configured to generate first light source light (11) having a first peak wavelength (λp1) selected from the range of 400-490 nm; (B) the second solid state light source (20) is configured to generate second light source light (21) having a second peak wavelength (λp2) selected from the range of 470-540 nm; wherein λp2 - λp1 ≥ 20 nm; (C) the luminescent converter (2000) is configured in a light receiving relationship with the first and second solid state light source (10,20); wherein the luminescent converter (2000) comprises a first luminescent material (210) and a second luminescent material (220); (D) the first luminescent material (210) comprises a luminescent material of the type M'xM2-2xAX6 doped with tetravalent manganese, wherein M' comprises an alkaline earth cation, M comprises a monovalent cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, wherein X comprises a monovalent anion, at least comprising fluorine; wherein the first luminescent material (210) is configured to convert at least part of the first light source light (11) received by the first luminescent material (210) into first luminescent material light (211); (E) the second luminescent material (220) is configured to convert at least part of the second light source light (21) received by the second luminescent material (220) into second luminescent material light (221); wherein the second luminescent material light (221) has a second centroid wavelength (λc2) selected from the range of 600-660 nm; wherein the second luminescent material light (221) comprises at least one emission band having a second full width at half maximum FWHM2 of ≥ 40 nm; (F) the first light generating device (110) is configured to generate first device light (111); wherein in an operational mode of the first light generating device (110), the first device light (111) comprises one or more of the first luminescent material light (211) and the second luminescent material light (221); wherein the first device light (111) has a first device centroid wavelength (λcd1) selected from the range of 600-660 nm; and (G) the control system (300) is configured to control a spectral power distribution of the first device light (111) by controlling the first solid state light source (10) and the second solid state light source (20).

The invention discloses a covalent organic framework (COF) heterostructure separation membrane for high-selectivity separation of monovalent cations as well as a preparation method and application of the covalent organic framework (COF) heterostructure separation membrane. The separation membrane comprises a porous supporting substrate and a COF selective layer on the porous supporting substrate, the selective layer is composed of a first COF layer and a second COF layer which are overlapped with each other, the first COF layer is formed by assembling COF nanosheets containing sulfonic acid groups or salt groups of the sulfonic acid groups, the second COF layer is formed by assembling COF nanosheets containing alkyl substituent groups, and a COF framework contains imine bonds. The preparation method comprises the following steps: preparing two types of COF nanosheet dispersion liquid through an oil-water-oil three-phase interface reaction, carrying out dispersion treatment, and sequentially depositing and curing / drying by adopting vacuum suction filtration to obtain the heterostructure separation membrane. The separation membrane can be used for selective separation of monovalent cations such as Li < + >, Na < + > and K < + >, is suitable for systems such as salt lake brine, seawater desalination concentrate and battery recovery liquid, and has the advantages of high ion screening selectivity, stable structure and controllable preparation.

The present application belongs to the technical field of inorganic salt separation and purification, and discloses a method for purifying ammonium chloride solution, aiming to solve the technical problem that the prior art cannot effectively separate ammonium ions and sodium ions. The method comprises: S1, purifying agricultural-grade ammonium chloride solution containing sodium ions through a first membrane system to obtain a first permeate and a first retentate, wherein the separation layer surface of the first special membrane is electronegative; S2, secondly purifying the first permeate through a second membrane system; and S3, obtaining product ammonium chloride solution and reusable fresh water through a product recovery system from the second permeate. The present application utilizes the electronegativity of the membrane surface and the differential interface interaction of different monovalent cations to realize the preferential permeation of ammonium ions and the effective retention of sodium ions. The method does not need to adjust the pH value or heat the raw material solution, has a simple process, low energy consumption, and can obtain ammonium chloride products with a purity of more than 99.5%.