703 results about "Ion selectivity" patented technology

The invention belongs to the technical field of separation membrane materials, and provides a covalent organic framework membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing an organic phase solution containing a polyaldehyde monomer and a water phase solution containing a polyamine monomer; dropwise adding the organic phase solution to the aqueous phase solution for reaction, and dialyzing the solution after the reaction is finished to obtain a purified aqueous dispersion of the covalent organic framework nanosheet; and dispersing the aqueous dispersion, carrying out suction filtration to a hydrophilic support, and carrying out heat treatment and curing. The invention also discloses the covalent organic framework membrane prepared according to the method and application thereof. The covalent organic framework membrane is used for removing divalent ions in a saline solution. The covalent organic framework membrane disclosed by the invention has an ordered pore structure with a specific size and high ion selectivity; due to the strong covalent bond connection characteristic, the covalent organic framework film is endowed with acid and alkali resistance and high stability; the preparation method disclosed by the invention is simple, mild in condition and wide in application range.

The invention provides a polyolefin coated diaphragm with ion selectivity, a preparation method and application. The polyolefin coated diaphragm is composed of a porous polyolefin supporting layer, and a first ion selective skin layer and a second ion selective skin layer which are positioned on two surfaces of the porous polyolefin supporting layer, the first ion selective skin layer and the second ion selective skin layer are both composed of an intrinsic microporous polymer PIM or a modified intrinsic microporous polymer PIM; the PIM material has a high specific surface area, a rich microporous structure and good electrolyte affinity; therefore, the polyolefin coated diaphragm has good wettability and lithium ion permeability, the overall mechanical property and heat resistance of the diaphragm are effectively improved, and light weight is kept; meanwhile, the diffusion coefficient of the diaphragm to metal ions such as Mn, Ni and Fe is greatly reduced, the situation that in a lithium ion battery positive electrode material using an existing diaphragm, the metal ions such as Mn, Ni and Fe are dissolved out during battery operation and then pollute a negative electrode of the battery is effectively avoided, and the service life of the battery can be effectively prolonged.

The invention relates to the technical field of aluminum ash washing filtrate recycling intelligent control, in particular to an aluminum ash washing filtrate recycling intelligent control device and method, and the device comprises a multi-parameter online detection module, a data processing optimization module, a process parameter execution module and a filtrate circulation module. The multi-parameter online detection module is used for cooperatively detecting the real-time concentration of trace impurity ions such as fluorine, potassium and sodium through an ion selective electrode array and a micro spectrum analyzer; predicting the dissolution trend of impurity ions through an LSTM model and generating a process parameter adjustment instruction; the process parameter execution module regulates and controls the stirring strength, the liquid-solid ratio and the water-ash contact time in a linkage manner; and the filtrate circulating module is used for buffering, homogenizing and proportionally mixing the washed liquid phase to generate a regenerated leaching medium for recycling. According to the method, the detection data and the model decision are dynamically matched through the closed-loop control process, and the impurity element removal efficiency is improved.

The invention provides an asymmetric modified silicon dioxide particle doped sulfonated polyether ether ketone membrane and a preparation method and application thereof, the preparation method comprises the following steps: (1) under a heating condition, mixing surface hydroxylated silicon dioxide particles and paraffin, adding a first solvent, stirring, and cooling to obtain paraffin emulsion droplets; (2) mixing the paraffin emulsion droplets obtained in the step (1) with a sulfydryl-containing silane coupling agent, and reacting to obtain a mixture; and mixing the mixture with a hydrogen peroxide solution, and carrying out oxidation reaction to obtain the asymmetrically modified silicon dioxide particles, and (3) mixing the asymmetrically modified silicon dioxide particles and sulfonated polyetheretherketone, and drying to obtain the asymmetrically modified silicon dioxide particle doped sulfonated polyetheretherketone membrane. The asymmetric modified silicon dioxide particle doped sulfonated polyether ether ketone membrane provided by the invention is low in swelling property, relatively high in proton conductivity and relatively good in ion selectivity, and the performance of a flow battery can be improved when the membrane is used for the flow battery.

The invention provides a method for recovering lithium in lithium precipitation mother liquor, which belongs to the technical field of hydrometallurgy and comprises the following steps: (1) activating a titanium adsorbent: activating the titanium adsorbent by using an acid solution; (2) adsorption: adsorbing lithium in the lithium precipitation mother liquor by using an extruded titanium adsorbent; (3) material washing: washing the adsorbent after adsorption by using pure water; (4) analysis: carrying out circulating analysis on the washed adsorbent by using hydrochloric acid with corresponding concentration to obtain a lithium-rich analysis solution; and (5) refluxing the lithium-containing desorption solution to the lithium precipitation unit. The extruded adsorbent used in the invention has high adsorption capacity and good ion selectivity, and by using the method, the high lithium recovery rate can be ensured, the interference of carnallite ions on lithium recovery can be avoided, the energy consumption is low, and the reduction of the operation cost is facilitated.

The present invention relates to a device (1) for the electroplating of a hard chromium layer made of a chromium(III) compound on a surface of a substrate (2), comprising an anode (3) and an electroplating bath (4) into which the substrate (2) acting as a cathode can be introduced, wherein the electroplating bath (4) contains a Cr(III) compound and a carboxyl compound of the formula R-COOH or a salt thereof, where R is a C1-10 alkyl radical, characterized in that the anode (3) is separated from the electroplating bath (4) by a cation-selective membrane (5). The present invention further relates to a method for the electroplating of a hard chromium layer made of a chromium(III) compound on a surface of a substrate (2) in this device (1), and to an article produced by this method comprising a chromium layer.

Provided herein are ion-selective separation membranes including a polymer matrix and a metal compound dispersed within the polymer matrix. The metal compound includes HaLibXcOa, where a is from 1 to 1.5, b is from 0 to 0.1, c is from 1 to 2, d is from 4 to 4.5, and X includes manganese or titanium.

The invention discloses an ion exchange membrane based on an intrinsic microporous polymer, and a preparation method and application thereof, and belongs to the technical field of high polymer materials. According to the application, 1, 3, 5-tri (4-aminophenyl) benzene (TAPB) and dimethyl formal are taken as polymeric monomers, a polymer with intrinsic sub-nano micropores and a corresponding homogeneous ion exchange membrane are prepared by utilizing the structural characteristics of rigidity and distortion of the TAPB, an ion transmission channel is formed by a unique micropore structure, and the sub-nano micropores have a size screening effect, so that the ion exchange membrane can be used for preparing the ion exchange membrane. The selective separation of monovalent / multivalent anions can be realized; after quaternization treatment is carried out on the membrane and a positively charged group is introduced, the positively charged group has a strong electrostatic repulsion effect, and selective separation of monovalent / multivalent cations can be realized, so that the polymer ion exchange membrane disclosed by the invention can be simultaneously applied to an acid-base recovery process, and has the characteristics of high selectivity, high permeation flux and stable long-term operation.

The invention provides application of a CoSe2-rGO catalyst in degradation of ofloxacin, and belongs to the technical field of sewage treatment. The graphene oxide (GO) with good ion selectivity, strong mechanical property and pollution resistance is used as a carrier, the carrier is combined with the transition metal selenide through a simple hydrothermal method to form a heterojunction composite material, and the prepared CoSe2 / rGO composite catalyst is used for activating PMS, has excellent catalytic activity, stability, durability and universality, and has good application prospects. And a feasible choice is provided for green elimination of antibiotic pollution in the environment.

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 quick-response ion selective liquid membrane electrode and a preparation method thereof. The ion selective liquid membrane electrode comprises a substrate electrode layer, the liquid film transduction and ion recognition functional layer comprises an ion selective film component and an electronegative two-dimensional conductive material doped in the ion selective film component, and the liquid film transduction and ion recognition functional layer is formed on the substrate electrode layer. The ion selective liquid membrane electrode achieves the purpose of high-sensitivity, high-stability, rapid and low-cost detection of electrolyte ions through electronegative two-dimensional conductive material doping and structure regulation and control, and can be applied to the field of ion concentration detection.

The present invention discloses a separation membrane based on a reactive support layer, a preparation method and an application, and belongs to the technical field of water treatment membranes. The preparation method includes: (1) subjecting a porous support membrane to an amino grafting reaction to prepare a reactive support membrane; and (2) subjecting an aqueous phase solution and an oil phase solution containing a multi-membered acyl chloride oil phase monomer to interfacial polymerization on the reactive support membrane to prepare a separation membrane based on a reactive support layer; where an aqueous phase monomer in the aqueous phase solution is a semi-aromatic amine or an aromatic amine. In the present invention, the porous support membrane is subjected to the amino grafting reaction to obtain the reactive support membrane, and the interface polymerization is carried out on a surface of the reactive support membrane. Due to the reactive support membrane, a structure of a formed polyamide separation layer can be changed, thereby improving the water permeability of a polyamide separation membrane and maintaining an ion retention property or the ion selectivity thereof. The method of the present invention has the advantages of a simple process, low requirements for equipment and convenience in industrial production, and the prepared high-performance separation membrane has a wide application prospect in the field of water treatment.

The invention provides an alkali metal group ion selective permeable membrane, a preparation method and a lithium, rubidium and cesium extraction method and system, and the membrane is prepared by taking polyphenylene sulfide, Zr (HPO4) 2 and a high-molecular polymer adhesive as raw materials through mixing, fibration treatment and compression molding processes. Based on the weak dipole adsorption characteristic between the sulfur position of high-crystallization polyphenylene sulfide and alkali metal cations, efficient screening of monovalent alkali metal ions (Li < + >, Rb < + > and Cs < + >) and multivalent impurity ions (Mg < 2 + >, Al < 3 + > and Fe < 2 + >) is achieved, and the method can be used for extracting rubidium and cesium. The ion selective permeable membrane has excellent mechanical properties, high separation efficiency and corrosion resistance, and is low in production cost; and finally, the multiple targets of lepidolite leaching liquid impurity removal and lithium rubidium cesium synergistic extraction are achieved.

The invention discloses a membrane material for an alkaline system, which is prepared by the following method: introducing hydrophilic micromolecules with double bonds into an inorganic material with alkali-resistant stability, polymerizing the hydrophilic micromolecules with double bonds into alkali-resistant hydrophilic macromolecules in the pore channels of the inorganic material, and then adding the alkali-resistant hydrophilic macromolecules into the inorganic material. The alkali-resistant hydrophilic macromolecule material (represented by the material A) is encapsulated in the alkali-resistant stable inorganic material. Alkali-resistant hydrophilic macromolecules form a continuous hydrogen bond network structure in pore channels of the inorganic material, inlet activation energy of ions at pore openings is reduced, the diffusion rate of the ions in the pore openings is increased, and the ionic conductivity of the material is improved. The composite membrane prepared by blending and compounding the material A and an organic polymer has high ionic conductivity and high ionic selectivity, and has good performance on an alkaline flow battery system and an alkaline water electrolysis hydrogen production device.

The invention provides a pretreatment method of a fluorine-containing sample for determining fluorine content by an ion selective electrode method, and belongs to the technical field of fluorine content detection. The pretreatment method provided by the invention comprises the following steps: mixing a fluorine-containing sample, absolute ethyl alcohol and an alkali reagent, and carrying out heat treatment to obtain a heat-treated sample; the heat treatment comprises first heat treatment and second heat treatment which are sequentially carried out; the temperature of the first heat treatment is 150-170 DEG C; the temperature of the second heat treatment is 650-750 DEG C; and leaching the heat-treated sample with water, and fixing the volume of the obtained leachate to obtain the fluorine-containing sample to be detected. According to the method, the fluorine-containing sample can be prevented from splashing during alkali fusion, the safety is good, the problem that the fluorine content of the fluorine-containing sample is low in the ion selective electrode method detection process is solved, and meanwhile, the time consumption is short, the efficiency is high, and the cost is low.

The invention relates to the technical field of tobacco production, and discloses a tobacco nitrogen fertilizer application method based on ion sensing, and the method comprises the following steps: soil foundation determination; applying a base fertilizer; transplanting and fertilizing; field topdressing; fertilizing in a vigorous growth period; management after fertilization: the nitrogen content of the soil is measured again 7-10 days after each time of topdressing, the fertilization frequency and dosage are adjusted according to monitoring data, stable nitrogen supply of the tobacco is ensured, and tobacco reviving or nitrogen fertilizer waste caused by excessive fertilization is avoided. By monitoring nitrogen ions in soil in real time, application of the nitrogen fertilizer is accurately regulated and controlled, the utilization efficiency of the fertilizer is improved, and tobacco growth is optimized. The precise fertilization method based on the ion selective electrode technology aims at solving the problems that in traditional fertilization, the nitrogen fertilizer dosage is difficult to precisely control, waste is caused, and tobacco leaves turn green. By monitoring the soil nitrogen ion concentration in real time and adjusting the fertilization amount according to the growth stage, the nitrogen fertilizer utilization efficiency is improved, the environmental pollution is reduced, the tobacco growth environment is optimized, and the tobacco yield and quality are improved.

The invention discloses a pyrenyl Schiff base fluorescent derivative, a fluorescent probe, a preparation method of the pyrenyl Schiff base fluorescent derivative and application of the pyrenyl Schiff base fluorescent probe in biological imaging, and belongs to the technical field of fluorescent probes. The pyrenyl Schiff base fluorescent probe capable of specifically detecting the zinc ions is prepared through two-step chemical reaction of Suzuki coupling reaction and aldehyde amine condensation reaction, and the pyrenyl Schiff base fluorescent probe has good recoverability and low cytotoxicity, is high in practicability and low in cost, and can be applied to detection of the zinc ions. In addition, the sensor has excellent ion selectivity to zinc ions, extremely high sensitivity, good Stokes displacement and visual sensing performance, and detection of exogenous zinc ions and endogenous zinc ions in cells and tissues is realized through biological imaging. The problems of difficult synthesis process, slow response speed, high detection cost, non-ideal biological imaging effect and the like of the conventional fluorescent derivative are solved.

The invention relates to a YaxAB nanopore, a system comprising the nanopore and application of the YaxAB nanopore. The YaxAB nanopore of the present invention has a funnel-shaped three-dimensional structure so that the change in current blocking according to the movement of an analyte captured inside the nanopore can be maximized, thereby enabling very sensitive measurement even of the structure and minute changes in physical and chemical properties (including dynamic changes and the like) of the analyte. And can cause very strong electroosmosis with high cation selectivity, such that various types of analytes can be captured and analyzed without being limited to the type of total charge. In addition, with respect to the nanopore of the present invention, the amino acid sequence of the monomer constituting the nanopore can be adjusted to improve protein purification yield and control an oligomerization mechanism, and thus a YaxAB nanopore having a pore size that cannot be formed by a wild-type monomer can be prepared. Furthermore, with respect to the nanopores of the present invention, YaxAB nanopores of various pore diameters can be secured using one-time purification, and nanopores of desired pore diameters can be selectively secured. Thus, limitations of conventional biological nanopores having fixed pore diameters can be overcome, so that for the YaxAB nanopore of the present invention, the size of the nanopore can be adjusted according to the size of an analyte. Further, the YaxAB nanopores of the present invention have a very wide analyte analysis range of dynamic detection range from small analytes to large analytes, which is caused by a funnel-shaped three-dimensional structure having a wide inlet and a narrow outlet. In addition, the YaxAB nanopore of the present invention has the largest nanopore structure among the hitherto biological nanopores, and a large-size analyte, which cannot be detected by conventional biological nanopores, can be detected and analyzed in a single molecule on the basis of a funnel structure having a large inlet. Furthermore, the present invention has established an optimized composition of a membrane in which YaxAB nanopores can be stably present, and by using a sensor implemented on the basis thereof, it is possible to qualitatively and quantitatively analyze various types of analytes having relatively various sizes and charges at a single molecule level with very high resolution and sensitivity.

The invention provides a triazinyl imidazole porous covalent organic polymer material, preparation thereof and application of the triazinyl imidazole porous covalent organic polymer material in an all-vanadium redox flow battery proton exchange membrane. The triazinyl imidazole covalent organic polymer with high specific surface area, porosity and high structural stability is synthesized, sulfonation modification is performed on the triazinyl imidazole covalent organic polymer, a proton carrier is loaded after sulfonation modification, and the triazinyl imidazole porous covalent organic polymer material with high proton conductivity is obtained. According to the invention, the triazinyl imidazole porous covalent organic polymer material and sulfonated polyetheretherketone are jointly used for preparing the composite membrane, so that the composite membrane shows excellent vanadium resistance and relatively high ion selectivity, and can stably operate in the all-vanadium redox flow battery, so that the comprehensive performance of the all-vanadium redox flow battery is remarkably improved.

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 relates to a lithium ion conductive dense membrane and a preparation method and application thereof. The lithium ion conductive dense membrane comprises a polymer base membrane, ion conductive inorganic particles and a polymer solid electrolyte, the polymer base membrane is of a net structure; the Gurley value of the lithium ion conductive dense film is larger than or equal to 1000, and the porosity is smaller than or equal to 5%. The lithium ion conductive dense membrane provided by the invention has the advantages of high lithium ion conductivity, high transport efficiency and high lithium ion selectivity, and can be applied to electrodialysis lithium extraction. And under the action of external voltage, lithium ions are directionally migrated to the air negative electrode subjected to oxygen reduction reaction through the lithium ion conductive dense membrane to form a lithium hydroxide solution, and other metal hetero-ions are isolated on the positive electrode side by the lithium ion conductive dense membrane, so that lithium enrichment is realized. And meanwhile, transportation of the membrane to lithium ions does not depend on pores in the conductive membrane, so that the service life can be prolonged while the lithium ion separability and the transportation efficiency of the salt lake lithium extraction method are improved.

The invention relates to a monovalent ion selective cation exchange membrane and a preparation method and application thereof, and the preparation method comprises the following steps: mixing polyethyleneimine and a cross-linking agent to obtain a pre-polymerized solution; coating the surface of a cationic base membrane with the pre-polymerized solution, and then heating to carry out a cross-linking reaction, so as to obtain a base membrane after surface cross-linking; and soaking the base membrane subjected to surface crosslinking in an oil phase solution of acyl chloride monomers, and carrying out interfacial polymerization reaction to obtain the monovalent ion selective cation exchange membrane. Through the synergistic effect of a three-dimensional network structure constructed through cross-linking reaction and a selective separation layer constructed through interfacial polymerization, the Li < + > / Mg < 2 + > separation coefficient can be increased, and long-acting and stable operation is achieved.

The invention provides a COF (at) POC composite film and a preparation method and application thereof. The preparation method comprises the following steps: a) dissolving a COF aldehyde monomer and a POC aldehyde monomer in an organic solvent to obtain a first solution; meanwhile, dissolving a COF amine monomer and a POC amine monomer in an organic solvent to obtain a second solution; b) mixing the first solution, the second solution and an acetic acid solution to obtain a homogeneous membrane casting solution; and c) dispensing the homogeneous casting membrane liquid, and reacting to obtain the COF (at) POC composite membrane. Compared with the prior art, the preparation method provided by the invention has the advantages that specific raw materials are matched with specific process steps and conditions, the overall better interaction is realized, and the prepared COF-POC composite membrane is good in mechanical strength and has high ion flux and excellent ion selectivity for monovalent and divalent ion separation; the method has a wide application prospect in the fields of seawater desalination, salt lake lithium extraction, drug separation and the like.

The present invention relates to an ion exchange membrane containing asymmetric ion channel units, and the ion exchange membrane is based on covalent organic frameworks (COFs) and contains ion channel units having different diameters, degrees of hydrophilicity, and charge characteristics, such that an ion exchange membrane having both excellent ion conductivity and ion selectivity may be produced.

The invention discloses a preparation and application method of a modified ion exchange membrane for electrodialysis, aiming at the problems of poor selectivity, low mechanical strength, high energy consumption and the like of the existing ion exchange membrane, the high-performance modified membrane is prepared by a base membrane pretreatment-functional grafting-gradient curing synergistic process. The preparation method specifically comprises the following steps: performing ultrasonic cleaning and acid-base activation on a polyethersulfone or sulfonated polystyrene-based membrane, soaking the polyethersulfone or sulfonated polystyrene-based membrane in a modification solution containing an amino / carboxyl / sulfo functional monomer, a cross-linking agent and an initiator, and performing gradient heating curing to form a stable cross-linked network; the grafting rate of the modified membrane is 15-35%, the ion exchange capacity is 1.8-2.5 mmol / g, the water content is 25-40%, and the membrane surface resistance is less than 3 omega.cm < 2 >. When the membrane is applied to an electrodialysis device, the membrane runs under the conditions of 10-30V direct-current voltage, 5-15cm / s flow velocity and 25-45 DEG C, the high-salinity wastewater desalination rate is greater than or equal to 95%, and the monovalent ion selectivity coefficient reaches 5.8-7.2; when the catalyst is used for acid-base recovery, the H < + > migration number is 0.92-0.96, and the energy consumption is reduced by 18-25%.

The invention belongs to the field of cation exchange membranes, and discloses a monovalent selective cation exchange membrane with crown ether grafted in an ion channel and a preparation method of the monovalent selective cation exchange membrane. The preparation method comprises the following steps: firstly, synthesizing a sulfonated chloromethylated polymer, evaporating a solvent to form a membrane, and then grafting a diaminodibenzo crown ether compound into an ion channel by adopting a simple and convenient hot soaking method and utilizing mutual reaction of amino and chloromethyl, so as to introduce a crown ether structure into the ion channel of the membrane. The crown ether structure has electrostatic interaction on alkali metal and also has different acting forces on different metals, so that the monovalent cation selective separation is achieved, and the prepared monovalent selective cation exchange membrane is suitable for an electrodialysis process.

The present invention discloses a ZIF / SPEEK composite diaphragm for a flow battery and a preparation method thereof. The composite diaphragm uses an alkali metal ion type sulfonated polyether ether ketone as a base film, and the sulfonation degree is 60% to 70%. The filler includes ZIF-8-X and ZIF-90-X. The ZIF-8-X material is ZIF-8-SO3H, ZIF-8-COOH or ZIF-8-OH, and the ZIF-90-X material is ZIF-90-SO3H, ZIF-90-COOH or ZIF-90-OH. The total doping amount of ZIF-8-X and ZIF-90-X is 1 to 5%. The present invention has excellent ion selectivity and ion conductivity, good chemical stability and mechanical properties, is applicable to various flow battery systems, and has good battery performance.

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.

An object is to provide a micro-analysis chip in which a satisfactory area of contact between a specimen and an ion-selective membrane and an adequate amount of the specimen that reacts with the ion-selective membrane can be secured, and which is excellent both in measurement sensitivity and in ion selectivity. In order to achieve the object, a micro-analysis chip as described below is provided. That is, provided is a micro-analysis chip including a channel region which is surrounded by a channel wall provided inside a porous substrate. The channel region includes a first channel chamber containing a reference electrode, a second channel chamber containing a working electrode. The working electrode is covered with an ion-selective membrane containing an ingredient that has ion selectivity. The ion-selective membrane has an exposed surface serving as a dispensing section to which a specimen is dispensed.

The invention belongs to the technical field of marine chemistry, relates to an anti-pollution type electrochemical sensor based on cyclopeptide as well as a preparation method and application of the anti-pollution type electrochemical sensor, and particularly discloses an environment-friendly all-solid-state calcium ion selective electrochemical sensor with anti-pollution capacity, which is used for monitoring calcium ions in ocean. The sensor adopts self-designed cyclic peptide as an antifouling layer, and the two ends of the newly designed cyclic peptide contain 3, 4-dihydroxyphenylalanine (DOPA) to form a stable annular structure, so that the stable annular structure can be firmly attached to the surface of an electrode. The abundant carbonyl groups and hydroxyl groups on the peptide chains of the cyclic peptides provide high hydrogen bond donor / acceptor capabilities, enabling them to form a hydrated layer on the interface that resists proteins or microorganisms. In addition, the anti-pollution capacity of the ion selective electrode modified by the cyclopeptide is remarkably improved, and the ion selective electrode shows good stability within 50 days. The method for introducing the anti-pollution cyclic peptide into the marine sensor is expected to improve the environmental compatibility and long-term stability of the marine sensor.