474 results about "Mixed matrix" patented technology

The invention relates to a preparation method and application of an organosilicon / MOF-303 mixed matrix membrane, a silicon source precursor is uniformly dissolved in an ethanol solvent, then a mixture of water and hydrochloric acid is added according to a certain proportion, a water bath heating reaction is carried out for a period of time to obtain an organosilicon sol, prepared MOF-303 powder is added into the organosilicon sol according to a certain proportion, and the organosilicon / MOF-303 mixed matrix membrane is obtained. The preparation method comprises the following steps: uniformly mixing the raw materials through ultrasound to obtain a separation layer sol, coating the prepared separation layer sol on a ceramic support body through a hot coating method, and calcining in an air atmosphere for a period of time to obtain the MOF-303 / mixed matrix membrane. An organic silicon substance BTESA with a rigid acetylene bridge structure is preferably selected as a precursor, an MOF-303 material with a high specific surface area is doped into the precursor, the pore channel structure of the membrane is modified, more adsorption sites are provided for water molecules, and the composite membrane material with the optimal separation performance is obtained by optimizing the composite proportion.

The invention relates to a preparation method for improving a sodium alginate pervaporation membrane by using a two-dimensional leaf-shaped zeolite imidazole framework (ZIF-L) material, and particularly relates to a preparation method for improving a sodium alginate pervaporation membrane by using a two-dimensional leaf-shaped zeolite imidazole framework (ZIF-L) material. The pervaporation mixed matrix membrane comprises a base membrane and a separation layer membrane, the base membrane adopts a polyacrylonitrile (PAN) membrane, and the separation layer is composed of ZIF-L and sodium alginate. According to the invention, the distribution of ZIF-L in the membrane is improved, directional arrangement is formed, and the separation effect and selectivity of the composite membrane are improved. A novel process is adopted, the defect problem of the ZIF-L-SA membrane is eliminated, the continuous ultrathin ZIF-L membrane is prepared through a secondary seed growth method, and the performance of the two-dimensional ZIF-L membrane is improved. The ZIF-L synthesis conditions are mild, the method is simple, hydrophilic modification of the membrane surface is achieved, an internal water molecule transmission channel is constructed, and the separation factor and stability of the membrane are improved. The prepared high-flux pervaporation membrane has a wide application prospect.

The invention discloses an antibacterial drug delivery system based on a dynamic response type microneedle patch and a preparation method, and belongs to the field of biomedical materials.The antibacterial drug delivery system comprises a substrate layer and a needle point layer arranged on the surface of the substrate layer, the substrate layer is a mixed matrix of polyvinyl alcohol (PVA) and polyvinylpyrrolidone (PVP), and the needle point layer is made of nano-silver; the needle tip layer is a phenylboronic acid modified oxidized hyaluronic acid and polyvinyl alcohol composite system. The antibacterial drug delivery system based on the dynamic response type microneedle patch, namely the microneedle patch with the pH response drug release function, is suitable for antibacterial treatment of infectious wounds, the mechanical strength of the needle point layer is improved, it can be better guaranteed that a microneedle completely penetrates into the skin, and the delivery efficiency is improved; meanwhile, drug release can be responded according to the pH of a bacterial infection part, and the antibacterial effect is good.

The invention provides a loess slope unmanned aerial vehicle ecological restoration method and system based on water-retaining agent blending, and the method comprises the steps: preparing a composite water-retaining agent from sodium polyacrylate and biochar, coating grass seeds with a double-layer coating, and mixing the composite water-retaining agent, the coated grass seeds and a fertilizer to form a mixed matrix; a bio-based binder is sown in a to-be-sown area of a wind power plant slope and a photovoltaic power station, and a pre-sown area is obtained; when the pre-sowing area is a side slope, sowing the mixed matrix in a side slope mode of an unmanned aerial vehicle self-adaptive sowing mechanism; when the pre-sowing area is the flat ground, sowing the mixed matrix in a flat ground mode of an unmanned aerial vehicle self-adaptive sowing mechanism; after the sowing of the mixed matrix is completed, the microbial agent is additionally sprayed, the stress resistance of plants is improved, and the grass seed sowing success rate is effectively improved through the water retention of the grass seeds and the sowing control of the grass seeds according to conditions, so that the ecological restoration of the wind power plant land is facilitated.

The invention discloses an in-situ growth MOFs (Metal-Organic Frameworks) mixed matrix membrane as well as a method and application thereof, and belongs to the technical field of membrane separation. The method disclosed by the invention comprises the following steps: adding a Zn source and 2-methylimidazole into a solvent, and carrying out hydrothermal reaction to obtain Polymer-ZIF-8; the preparation method comprises the following steps: mixing Polymer-ZIF-8 with a diluent, and sequentially heating, uniformly mixing and cooling, so as to obtain a Polymer-ZIF-8 / diluent uniform block; the Polymer-ZIF-8 / diluent uniform block is subjected to post-treatment, and the MOFs mixed matrix membrane is obtained; the Zn source is a zinc ion type polymer. The method overcomes the problem of interfacial compatibility in mixed matrix membranes.

The invention discloses a high-solid-content MIL-101 (Fe) / PIM-1 mixed matrix membrane and a preparation method thereof, and belongs to the technical field of gas separation membranes. The preparation method comprises the following steps: firstly, dissolving an iron source in a PIM-1 polymer solution to form a homogeneous membrane casting solution; forming the obtained membrane casting solution, and removing the solvent to obtain a PIM-1 / Fe (II) composite substrate containing Fe (III); then, the substrate is alternately immersed in a terephthalic acid methanol solution and a ferric salt methanol solution, and MIL-101 (Fe) is generated in the polymer matrix through in-situ limited crystallization by layer-by-layer limited crystallization. According to the method, the problem of interfacial compatibility between the MOF filler and the polymer matrix is effectively solved, and high loading capacity (up to 52.9 wt.%) of MIL-101 (Fe) is realized without agglomeration. Meanwhile, the membrane has excellent COplasticizing resistance and long-term operation stability, and has a wide application prospect in the fields of carbon capture and the like.

The invention relates to the technical field of membrane separation materials, in particular to a mixed matrix membrane and a preparation method and application thereof. The mixed matrix membrane comprises: (1) a polymer functional membrane; (2) a base film for supporting the polymer functional film; a polymer in the polymer functional film comprises a polymer with a structure as shown in a formula (a), in the formula (a), R0 is an alkylene chain, R1 is a polysiloxane group, R2 is alkyl or hydrogen, and m is equal to 1-20. According to the present invention, the functional membrane prepared from the polymer having the structure (a) is used, and the structure of the polysiloxane is designed and optimized, such that the mixed matrix membrane has excellent organic solvent tolerance and organic solvent pervaporation separation property, and the interfacial compatibility between the polymer and the porous filler can be improved.

The invention discloses an MOF-808-CA-Me mixed matrix gas separation membrane as well as a preparation method and application of the MOF-808-CA-Me mixed matrix gas separation membrane. The preparation method comprises the following steps: preparing MOF-808 (Zr) by utilizing a solvothermal method, reacting with citric acid to graft carboxyl to obtain MOF-808-CA, reacting with melamine to obtain MOF-808-CA-Me, uniformly mixing with a Pebax1657 membrane casting solution, pouring on a base membrane, and obtaining a target membrane material by utilizing a solvent evaporation method. According to the method, an amido bond is formed through a reaction between-COOH of citric acid and-NH2 of melamine, and MOF-808-CA-Me is stabilized in the adsorption and desorption processes of carbon dioxide; the preparation process is simple, convenient and efficient, the cost is low, and the prepared MOF-808-CA-Me mixed matrix gas separation membrane has good selectivity to CO2 / CH4.

The invention discloses a mixed matrix membrane for efficient oxygen and nitrogen separation and a preparation method and application thereof. The mixed matrix membrane comprises a polymer continuous phase and an MOF filler uniformly dispersed in the polymer continuous phase, the MOF filler can separate nitrogen and oxygen, and the surface of the MOF filler is modified by the silane coupling agent, so that the MOF filler is well compatible with a polymer, and the oxygen-nitrogen separation effect is improved. The polymer solution and the MOF filler dispersion liquid are mixed, the mixed matrix membrane is prepared through the non-solvent induced phase separation method, and the method has the advantages of being simple in reaction condition, high in efficiency, easy to amplify and the like and has wide engineering prospects.

The invention belongs to the technical field of ethanol recovery, and relates to a preparation method of a tubular ceramic carrier-based C-ZIF-67 derived nano-porous carbon doped PDMS mixed matrix membrane and an application of the membrane in recovery of ethanol by pervaporation of a low-concentration ethanol aqueous solution. Comprising the following steps: synthesizing a ZIF-67 crystal, and carbonizing the ZIF-67 crystal to obtain C-ZIF-67 filler particles; the ZIF-67-derived nano-porous carbon particles are prepared through a high-temperature calcination method, the particles are fully carbonized at a certain calcination temperature, disappearance of characteristic groups after carbonization can reduce the influence of surface electrical properties of the particles, and the size shrinkage of the particles is reduced, so that the dispersity of the particles in a matrix membrane is improved; meanwhile, the MOF skeleton structure is still reserved after carbonization, the pore diameter is increased, the carbon material also has strong hydrophobicity, the hydrophobic large-pore-diameter separation pore channels are more beneficial to passing of ethanol molecules and promotion of the separation effect, the separation factor and the total flux are almost kept unchanged after long-time operation and use, and excellent performance is shown; good application prospects are realized.

The invention discloses a preparation method and application of a membrane material suitable for low-concentration CO2 separation. According to a mixed matrix membrane prepared by the method, an MOF material with fluorine element sites is added to serve as a filler under the condition that a filler framework is kept unchanged, and PIM-1 and PIM-2 serve as polymer matrixes. The defects in the field of low-concentration CO2 membrane separation in a moisture environment are overcome, the filler rich in fluorine element sites and the polymer matrix are combined, and by exploring the polymer synthesis mode, temperature and time and by exploring the mode of adding the fluorine element sites under the condition that the metal organic framework is kept unchanged, the high-concentration CO2 membrane separation efficiency is improved. And the mixed matrix membrane suitable for low-concentration CO2 separation in a moisture environment is successfully synthesized and prepared. The MOF-based mixed matrix membrane with multiple fluorine element sites shows good CO2 permeability and ultrahigh CO2 / N2 selectivity in the field of membrane separation, and strong affinity among a polymer matrix, an MOF filler and CO2 molecules.

The invention relates to the technical field of geological exploration, in particular to a deep water ultra-shallow natural gas reservoir rock physical shear wave velocity prediction method, which comprises the following steps: calculating the equivalent bulk modulus, shear modulus and density of a mixed matrix of various minerals according to the shale content; calculating the bulk modulus and the shear modulus of the skeleton; calculating the bulk modulus and the shear modulus of the saturated rock through the model, and calculating the density of the saturated rock through the density of the rock matrix; distributing longitudinal and transverse velocities in a suspension state and a bearing state, and calculating equivalent longitudinal and transverse wave velocities; taking the longitudinal wave velocity as a known condition, and constructing an inversion objective function by using the equivalent longitudinal wave velocity; comparing the actual longitudinal wave speed with the calculated longitudinal wave speed; and realizing nonlinear inversion of the shear wave velocity according to an algorithm, and obtaining the shear wave velocity of the work area to be inverted. According to the method, rock physical models in a particle suspension state and a bearing state are considered at the same time, and shear wave velocity prediction and direct inversion of the shear wave velocity of the deepwater ultra-shallow natural gas reservoir are realized.

The invention discloses a method for preparing open-cell zeolite molecular sieve homogeneous dispersion liquid under mild conditions. The method comprises the following steps: dispersing a molecular sieve containing a template agent in a quartz container filled with methyl pyrrolidone and hydrogen peroxide, and carrying out ultraviolet radiation on a solution in a continuous stirring state to obtain the activated open-pore zeolite molecular sieve dispersion liquid. According to the method provided by the invention, the organic template agent in micropores of the zeolite molecular sieve nanosheets or nanoparticles can be effectively removed at a temperature close to room temperature, the operation is simple, the condition is mild and pollution-free, and the problem that the zeolite molecular sieve nanosheets or nanoparticles are seriously agglomerated during traditional high-temperature roasting and pore opening is effectively solved. The highly dispersed open-pore zeolite molecular sieve nanosheet or nanoparticle dispersion liquid has a wide application prospect in construction of a two-dimensional zeolite molecular sieve membrane or a mixed matrix membrane.

The invention discloses a ZnO / PES mixed matrix ultrafiltration membrane and a polyaniline-ZnO / PES mixed matrix nanofiltration membrane as well as a preparation method and an application of the ZnO / PES mixed matrix ultrafiltration membrane and the polyaniline-ZnO / PES mixed matrix nanofiltration membrane. PES is used as an organic polymer, PEG1500 is used as a pore-foaming agent, ZnO is used as a nano filler, and the ZnO / PES composite ultrafiltration membrane is prepared through a non-solvent induced phase inversion method. The preparation method comprises the following steps: synthesizing a polyaniline coated ZnO nano composite material, blending zinc nitrate hexahydrate in ammonia water with a polyaniline solution to form a nano composite structure, and preparing the polyaniline-ZnO / PES mixed matrix nanofiltration membrane by taking the synthesized nano composite particles as a filler. According to the mixed matrix membrane technology, alkali and lignin in the black liquor can be directly recovered, compared with alkali recovery through a combustion method, the mixed matrix membrane technology has the advantages of being easy to operate, not complex in process, low in investment cost, small in occupied area, low in energy consumption, good in environmental compatibility and the like, and meanwhile subsequent high-valued comprehensive utilization can be conducted on lignin.

The invention provides a method for in-situ preparation of a covalent organic framework mixed matrix membrane. The method mainly comprises the following steps: dissolving a film-forming polymer, a pore-forming agent and an aldehyde monomer in a solvent, stirring and heating to prepare a film casting solution; dissolving an amino monomer in water to prepare a coagulating bath; a glass plate is coated with the membrane casting solution to form a liquid membrane, the liquid membrane is immersed in a coagulating bath, in the process, macromolecules are separated out to form a membrane, and an amino monomer in the coagulating bath reacts with an aldehyde group monomer in the membrane casting solution to form an amorphous macromolecular network; and putting the membrane into a solvent added with a catalyst, and heating to obtain the covalent organic framework mixed matrix membrane. The method mainly has the advantages that the amido monomer and the aldehyde group monomer are respectively added into the coagulating bath and the membrane casting solution, so that the reaction process of the two monomers is matched with the precipitation process of the polymer matrix, and the synergistic reinforcement of the periodic nanopores of the covalent organic framework filler and the excellent membrane forming property of the polymer matrix is realized.

The invention discloses a preparation method of a metal organic framework gel mixed matrix membrane and application of the metal organic framework gel mixed matrix membrane in CO2 / CH4 separation, and belongs to the technical field of gas separation membranes. The method comprises the following steps: dispersing metal organic framework (MOF) gel into a solvent to obtain a solution containing an MOF gel network; then, sequentially adding diamine and dianhydride monomers into the solution, and carrying out polymerization reaction to directly prepare a mixed matrix membrane casting solution; then, uniformly coating a glass culture dish with the membrane casting solution, and finally obtaining the mixed matrix membrane through the steps of heat treatment, cleaning and drying. The method is mild in preparation condition and simple to operate. The MOF gel is selected as a filler, a continuous transmission channel is constructed in a solvent, and in-situ polymerization is performed to form a polyimide matrix, so that the permeation flux of the separation membrane is remarkably improved, and the interfacial compatibility between the filler and the matrix is effectively enhanced. The prepared mixed matrix membrane shows excellent CO2 / CH4 separation performance.

The invention discloses an underdetermined blind source separation method based on improved single source point detection, and the method comprises the steps: firstly, carrying out the initial single source point extraction of a mixed signal through employing the cosine angle criterion of a real part and an imaginary part of a time-frequency matrix column vector; then, abnormal points are removed according to whether the linear relation between the single source points and the abnormal points exists or not, the influence of the abnormal points on single source point detection is reduced, and therefore the estimation precision of a hybrid matrix is improved; then, clustering is carried out on the obtained single source points by using a K-means algorithm, so that an estimated hybrid matrix is obtained; and finally, recovering a source signal by using a least square method. The method provided by the invention not only considers the absolute direction of the real part and the imaginary part in the single source point, but also considers the linear relation between different single source points to remove the abnormal points, so that the estimation precision of the hybrid matrix can be improved, the noise immunity of the method is enhanced, and finally, a high-quality recovery signal is obtained.

The invention discloses a gas separation mixed matrix membrane and a preparation method thereof, and belongs to the technical field of gas membrane separation. The mixed matrix membrane comprises a high polymer material matrix and a porous material, and through hydrogen-bond interaction formed by the high polymer material matrix and the porous material, the interfacial compatibility between a filler and the polymer matrix and the dispersity of the filler are remarkably enhanced; the pore material is used as a pore structure regulator, improves the chain accumulation mode of a polymer matrix and provides a selective gas separation window, and the gas screening capacity of the membrane is remarkably improved through the synergistic effect of the pore material and the pore structure regulator. The mixed matrix membrane is prepared by adopting a solution pouring method, the process is simple, the repeatability is high, large-area preparation is easy, the cost is low, the method is suitable for the fields of helium separation, hydrogen purification, natural gas purification, biogas purification and carbon capture, and the application prospect is wide.

The invention discloses a blind separation and time-frequency noise reduction combined comprehensive pulsar time establishing method. The method comprises the following steps: selecting a pulsar meeting a preset requirement; processing the timing residual error of the selected pulsar; establishing a mixed signal model, iteratively solving an anti-mixing matrix through an approximate negentropy contrast function, and separating independent components from the multi-dimensional features; carrying out Pearson correlation analysis on each separated independent component and reference time; and performing multi-scale decomposition on the selected common-mode clock difference signal by adopting a plurality of wavelet bases, and performing Bayesian soft threshold processing to obtain the final comprehensive pulsar time. According to the method, the long-term stability of the comprehensive pulsar is improved, the common problems of aliasing and modal mixing in a high-noise environment in the prior art are solved, and the extracted signal is more stable.

The invention discloses a method for preparing a mixed matrix proton exchange membrane with an ultrahigh filler ratio through electrostatic spraying. Preliminary dispersion of filler in membrane liquid is achieved through wet ball milling, the membrane liquid is stretched into nanoscale charged liquid drops at a spray head through the electrostatic field effect, the liquid drops achieve uniform dispersion of the filler in the space due to the charge repulsion effect, filler agglomeration can be avoided, and interface fusion can be enhanced; in the electrostatic spraying process, liquid drops fall on a roller shaft under the action of an electric field and are overlapped and fused into a film, so that the mechanical strength of the mixed matrix film can be effectively improved; the nanoscale liquid drops are overlapped on the roller and dried and volatilized to block holes, and the compact mixed matrix proton exchange membrane can be prepared in one step through in-situ densification. The compact mixed matrix membrane with ultrahigh filler loading capacity can be prepared in one step, the problems that an existing mixed matrix proton exchange membrane is low in filler ratio, poor in organic-inorganic compatibility, poor in mixed matrix membrane mechanical strength and the like are solved, the loading capacity of the filler in the membrane is greatly improved, and the preparation method is simple and easy for large-scale continuous production.

The invention belongs to the technical field of covalent organic framework membrane materials, and provides a covalent organic framework / polyether sulfone mixed matrix membrane as well as a preparation method and application thereof. The method comprises the following steps: mixing polyether sulfone, a solvent and trialdehyde phloroglucinol to obtain a trialdehyde phloroglucinol solution; the glass fiber filter membrane is coated with the trialdehyde phloroglucinol solution, and a trialdehyde phloroglucinol / polyether sulfone membrane is obtained; the method comprises the following steps: mixing p-phenylenediamine, a catalyst and water to obtain a p-phenylenediamine solution; the trialdehyde phloroglucinol / polyether sulfone membrane is soaked in a p-phenylenediamine solution for a reaction, and the covalent organic framework / polyether sulfone mixed matrix membrane is obtained. The preparation method disclosed by the invention is mild in condition, the obtained membrane is uniform and stable, the advantages of high flux of a polymer and strong adsorption and separation of a covalent organic framework on CO2 are fully combined, and the H2 flux and H2 / CO2 selectivity of the covalent organic framework / polyether sulfone mixed matrix membrane are greatly improved.

The invention relates to the technical field of membrane separation, in particular to an MOFs mixed matrix membrane for nitrogen-oxygen separation and a preparation method of the MOFs mixed matrix membrane. The preparation method comprises the following steps: by taking high polymers such as PI, PSF and PIM-1 as film forming materials, embedding a metal organic framework (MOF) material with an affinity effect on oxygen into a polymer film matrix by adopting an in-situ growth method. The nitrogen-oxygen separation mixed matrix membrane is prepared through an in-situ growth MOF method, the method does not need to prepare MOFs firstly and then disperse MOFs particles, the agglomeration phenomenon caused by non-uniform dispersion is avoided, the gas separation performance of the composite membrane can be regulated and controlled by increasing the growth period of MOFs, the permeability of oxygen and the selectivity of oxygen / nitrogen are improved, and the nitrogen-oxygen separation effect is improved. Clean oxygen-enriched air with the oxygen content being 50% or above can be stably produced, and cost and energy consumption are reduced.

The invention discloses a modified CM square electric power corrugated pipe, belongs to the technical field of electric power pipe processing, and aims to solve the technical problem that the burnthrough resistance and the mechanical strength of a square electric power corrugated pipe in the prior art need to be further improved. The corrugated pipe comprises a square pipe and a plurality of corrugated rings arranged outside the square pipe, the square pipe and the corrugated rings are made of a modified CM material, siloxane-enhanced modified chlorinated polyethylene rubber and chlorinated polyvinyl chloride are combined to form a mixed matrix, and the mixed matrix is enhanced by using a composite filler composed of modified inorganic powder and modified glass beads. The tensile property and the impact resistance of the modified CM square electric power corrugated pipe are effectively enhanced, the burn-through resistance and the low temperature resistance of the material are improved, and the modified CM square electric power corrugated pipe is more convenient and more advantageous in practical application by optimizing the structure of the electric power corrugated pipe.

The invention belongs to the technical field of preparation of membrane materials and adsorption separation materials, and particularly relates to an MOFs / PVA cross-linked composite film as well as a preparation method and application thereof. The preparation method comprises the following steps: modifying MOFs with amino on the surface to enable the surface of the MOFs to have silicon hydroxyl, then mixing with polyvinyl alcohol (PVA), and heating and drying in a mold to obtain the MOFs / PVA cross-linked composite film. The cross-linked composite film provided by the invention is uniform and continuous, and the problem of poor dispersibility of the MOFs material in the mixed matrix film is solved. The film has good adsorption capacity on metal ions such as molybdate radicals, is high in hydrophilicity and still has a stable film structure in an acid environment, and an effective solution is provided for treatment of heavy metal pollution in industrial wastewater.

The invention belongs to the technical field of gas membrane separation, and discloses a preparation method of a fluorinated MOFs (Metal-Organic Frameworks) mixed matrix membrane for efficiently extracting hydrogen / helium from natural gas. CF3 is introduced into an MOFs framework to prepare fluorinated MOFs, and introduction of CF3 reduces the aperture of MOFs, enhances the molecular sieving effect, and improves the diffusion selectivity of H2 (He) / CH4. In addition,-CF3 has an inhibition effect on CH4 adsorption, and the dissolution selectivity of H2 (He) / CH4 separation is improved. The existence of-CF3 in the fluorinated MOFs can induce the MOFs and the polymer to form dipole-dipole interaction (C-F... O = C), so that the filler and the polymer have good interfacial compatibility, the improvement of the filler loading capacity is facilitated, and meanwhile, the generation of non-selective defects at an interface is avoided. The mixed matrix membrane prepared by the method has important significance in the field of high-efficiency hydrogen / helium extraction of natural gas.

The application provides a mixed matrix membrane for efficient ion separation and a preparation method thereof, and belongs to the technical field of separation membranes.The application mixes an aluminum salt and sodium hydroxide in an organic solvent, then adds a heterocyclic organic ligand containing nitrogen to obtain a MOF precursor solution; adds polyimide into the MOF precursor solution to obtain a casting solution; pours the casting solution into a mold and performs vacuum heating, then performs peeling, soaks in ethanol, and then performs drying to obtain the mixed matrix membrane for efficient ion separation.The application realizes uniform dispersion of MOF-303 in the whole matrix by controlling the MOF loading, and constructs continuous ion channels by the uniformly dispersed MOF-303 crystal structure, so that the selectivity of the membrane to monovalent ions is further improved.The operation is simple, and the cost is low.

The invention provides a preparation method of a separation material with metal pi site MOF filling and application of the separation material in carbon capture, and belongs to the technical field of material preparation and carbon capture. The preparation method comprises the following steps: firstly, preparing a metal pi-site MOF material with a metal pi-site modified metal organic framework (MOFs), and preparing a carbon trapping material by taking the metal pi-site MOF material as a filling agent; the carbon trapping material takes a metal pi site MOF as a filler and a polyether polyimide block Pebax as a polymer matrix, and the carbon trapping material is formed by physically blending the filler and the polymer matrix at normal temperature; the carbon capture material improves the selectivity and permeability of CO2 / CH4 in the membrane, has good selectivity to CO2 / CH4, and can efficiently separate CO2 / CH4. The carbon capture material with the metal pi site MOF and the preparation method thereof are simple and wide in practicability, and have excellent natural gas decarburization performance, so that the mixed matrix membrane has a good prospect in many applications related to CO2 membrane separation.

The invention provides an XLPEO / MIL-TAPB-DMTP-COF mixed matrix membrane and a preparation method and application thereof.The preparation method includes the steps that a MIL-TAPB-DMTP-COF core-shell material is prepared through a double-ligand auxiliary synthesis strategy, the MIL-TAPB-DMTP-COF core-shell material is doped into a mixed solution of polyethylene glycol diacrylate and polyethylene glycol diacrylate to be evenly dispersed to form a membrane casting solution, the two PEO polymers are crosslinked through ultraviolet irradiation, and the XLPEO / MIL-TAPB-DMTP-COF mixed matrix membrane is obtained. And the XLPEO / MILat TAPB-DMTP-COF mixed matrix membrane is formed, and has good CO2 / N2 separation performance.

The invention relates to the technical field of gas separation membranes, in particular to a method for in-situ preparation of a covalent organic framework (COFs) mixed matrix membrane in a polymer matrix and application of the covalent organic framework (COFs) mixed matrix membrane in CO2 separation. According to the method, a COFs precursor is directly introduced into a polymer matrix, and a solvent molecule is utilized to promote the precursor to generate a Schiff base reaction, so that in-situ generation of COFs nanoparticles in the polymer matrix is realized, and the covalent organic framework mixed matrix membrane is prepared. The method provided by the invention not only promotes the uniform dispersion of COFs in a polymer matrix, but also significantly enhances the interfacial compatibility between COFs and the polymer matrix, and the prepared membrane material shows excellent long-term stability. The method is simple in process, and the prepared covalent organic framework mixed matrix membrane has important application potential in the field of CO2 separation.

A MEMS gas sensor and a preparation method therefor, comprising an insulating substrate (1), a heating electrode (403), an insulating layer (105) and a testing unit, which are overlappingly disposed. The testing unit comprises a testing electrode, a sensing unit (2), and a selective separation membrane (3); the sensing unit (2) has a nanowire array structure formed by multiple nanowires disposed at intervals, and the selective separation membrane (3) covers the surface of the sensing unit and a recessed portion; the nanowires comprise a first metal and a second metal, the first metal being Pd, and the second metal being at least one selected from Ni, Cu, Ag, Au and Ir; the selective separation membrane (3) comprises an inner separation membrane (301) and an outer separation membrane (302) which are stacked in sequence; the inner separation membrane (301) comprises polytetrafluoroethylene, and the outer separation membrane (302) is a mixed matrix membrane having a covalent organic framework material as a filler and a polymer of intrinsic microporosity as a matrix. The MEMS gas sensor possesses excellent sensitivity for low-concentration gas monitoring, and tolerance stability for high-concentration gas, as well as excellent anti-interference performance and response speed.