299 results about "Metal-organic framework" patented technology

The application relates to a sensor for synchronously detecting enniatin and roquefortine based on a double-potential electrochemiluminescence immunoassay technology as well as a preparation method and a detection method thereof. The sensor comprises a base electrode, a sensing interface composed of a nanocomposite is modified on the surface of the base electrode, mixed coated antigens including ENNs-BSA and AOH-BSA fixed on the sensing interface, mixed probes including a cathode probe and an anode probe, the cathode probe is Zr-Por-MOF-ENNs Ab which is obtained by marking ENNs antibodies with a porphyrin zirconium metal organic framework, the anode probe is Ce-In-MOF@ABEI-AOH Ab which is obtained by marking AOH antibodies with ABEI loaded on a cerium-doped indium metal organic framework, and a detection solution containing a single co-reactant potassium persulfate. The application can realize one-time sample adding, double-potential scanning and synchronous quantification for two kinds of mycotoxins of enniatin and roquefortine.

The application discloses a kind of organic metal framework modified carbon nitride composite material and photocatalytic hydrolysis hydrogen production method, belong to photocatalytic hydrogen production technical field.The present application aims to solve the problems of high carrier recombination rate of existing carbon nitride-based photocatalyst, weak interface bonding of heterojunction, low hydrogen production efficiency.The present application introduces oxygen-containing functional groups on the surface of graphite phase carbon nitride by oxidation modification, and uses in-situ synthesis method to make copper-based metal organic framework (CuMOF) grow uniformly and closely on the surface of modified carbon nitride through chemical coordination, forming CNO@CuMOF composite material with type II heterojunction structure.The present application also provides a method for photocatalytic hydrolysis hydrogen production of the composite material under visible light driving, by optimizing the reaction system and process conditions, efficient and stable photocatalytic hydrogen evolution is realized, and the catalyst has excellent recycling performance, which is suitable for green hydrogen energy preparation field.

A method for preparing and applying an iron hydroxyl oxide-metal-organic framework heterostructure alkaline water electrolysis catalyst is disclosed, belonging to the technical field of electrochemical energy storage materials. The preparation method involves: firstly, anolysing iron foam under constant current; then dissolving 2,5-dihydroxyterephthalic acid and nickel nitrate hexahydrate in a mixed solvent of N,N-dimethylformamide / ethanol / deionized water; transferring the mixture to a reaction vessel, tilting the iron foam into the vessel, sealing and heating the reaction, and then naturally cooling to room temperature; removing the iron foam, rinsing it with deionized water and ethanol (both sides), and finally vacuum drying. This method is simple and reproducible, requiring no cumbersome high-temperature pyrolysis or etching processes, and is suitable for large-scale preparation. In a standard three-electrode system, the prepared electrocatalyst is directly used as the working electrode in a 1 M KOH electrolyte for electrocatalytic reaction; the electrocatalyst exhibits excellent water splitting activity and cycling stability at high current densities.

The application provides a metal organic framework material patterning additive manufacturing method, and relates to the technical field of additive manufacturing.The application proposes a new strategy of MOF micro-nano additive manufacturing based on mechanical chemical fixation and hydrothermal conversion, and the application utilizes the mechanical friction effect of a friction pair on the surface of a base material to fix metal oxide precursor micro-nano structures in a preset track in a directional and quantitative manner, so as to form an accurate patterned prototype; then, the fixed precursor is reacted with an organic ligand through a hydrothermal reaction, so as to be directionally converted into a corresponding MOF structure.The application implements the patterning construction of the precursor and the conversion of the MOF in steps, so as to not only ensure the fineness of the precursor structure, but also ensure the sufficiency and crystallinity of the MOF conversion.The whole process does not need a mask, does not need electron beam exposure, and does not need a developing solution treatment, has low requirements on equipment, is simple to operate, has a cost significantly lower than that of a traditional photolithography technology, and has good material universality and base adaptability.

The application belongs to the technical field of electrocatalysis, and discloses a bimetallic fluorinated metal organic framework catalyst, a preparation method thereof and application of the catalyst in active oxygen assisted membrane-free electrolytic ammonia oxidation for preparing nitrite, wherein the catalyst is prepared by self-assembly of Cu 2+ , Ni 2+ and a tetrakisfluorophthalic acid ligand through a solvothermal method, and there is a directional electron transfer effect between Cu and Ni. The application utilizes the Cu / Ni bimetallic electron synergistic effect to precisely regulate the d-band center of the catalyst, and a membrane-free electrolysis device is matched to save an expensive proton exchange membrane. The application provides a new efficient and feasible path for green, economical and scaled electrocatalytic synthesis of nitrite.

The application discloses a capillary open-tube chromatographic column preparation method based on a defect engineering metal organic framework-molecular imprinting composite nanomaterial and application, and particularly relates to the field of chemical synthesis and analysis technology. A GLYMO-IDA-silane solution is used to flush a pretreated capillary, so that a carboxyl-modified capillary is obtained. Then, an N,N-dimethylformamide solution containing zirconyl chloride octahydrate, terephthalic acid, L-proline and hydrochloric acid is injected into the cysteine-modified capillary, and under a heating condition, a metal organic framework UiO-66-L-Pro is in-situ grown on the inner wall of the capillary. D-tryptophan and norepinephrine are dissolved in a neutral buffer solution, and after magnetic stirring for 30 min, ferrous sulfate is added and rapidly injected into the UiO-66-L-Pro-modified capillary, and then both ends are sealed, and reaction is carried out at room temperature for 24 h. An acetic acid / SDS solution mixture is used to flush the capillary for 1.5 h to elute the template molecules, and then nitrogen is used to blow dry, so that an MIP@UiO-66-L-Pro@capillary is prepared.

The present invention relates to the fields of metal organic framework synthesis and photocatalysis. Provided are a hexabenzocoronene-based metal organic framework capable of directed modification, a preparation method therefor and the use thereof. The method comprises: adding H3BTB, a H4BDQDA-R ligand, ZrCl4 and benzoic acid to N,N-dimethylformamide (DMF), full stirring same to dissolve the reactants, and reacting same to obtain a crystalline product Zr-MOFs; collecting the obtained crystalline product by centrifugation, and washing same with fresh DMF and acetone to obtain layer-pillar Zr-MOFs having the same topological network, wherein in the H4BDQDA-R, R is -NO2, -H, -tBu, -OCH3, -OH and -NH2. The hexabenzocoronene-based Zr-MOFs capable of directed modification prepared by the present invention involve a simple synthesis method and have high stability, and can be used for photocatalytic CO2 reduction reaction. In addition, the prepared series of Zr-MOFs have a wide tunable band gap width value range and are excellent photocatalysts.

This invention discloses the preparation and gas adsorption separation application of pyrazole-3,4,5-tricarboxylic acid ligand heteronuclear metal-organic framework materials, comprising the following steps: 1) Weighing CuCl2·2H2O, Ba(NO3)2, and 1H-pyrazole-3,4,5-tricarboxylic acid as raw materials; 2) Placing the raw materials in a polytetrafluoroethylene-lined reactor, adding distilled water, and adjusting the pH to 2-4 with malonic acid; 3) Sealing the reactor and heating the reaction, raising the temperature from room temperature to 80-120℃ over 0-12 hours, holding the temperature for 70-75 hours, and then lowering it to room temperature over another 0-12 hours; 4) Collecting the product, washing, and vacuum drying to obtain the chemical formula [Cu2Ba(HL)2(H2O)3]. n The crystal is a pyrazole-3,4,5-tricarboxylic acid. By combining the multi-site coordination advantages, heterometallic node construction advantages, and pore functionalization control advantages of pyrazole-3,4,5-tricarboxylic acid, a stable framework structure can be constructed while simultaneously adjusting pore size, optimizing pore wall polarity, and constructing local adsorption sites, thereby enhancing the material's application potential in SF6 capture and separation, and C2 gas adsorption and storage.

The application belongs to the technical field of photocatalytic materials, and particularly relates to a semi-metal carbon nitride / metal organic framework MIL-53Fe heterojunction photocatalyst, a preparation method and application thereof. The mass ratio of the semi-metal carbon nitride and the metal organic framework MIL-53Fe is 1:10-3:10. The preparation method comprises the following steps: dissolving sodium tricyanomethanide and 1-butyl-3-methyl imidazole chloride in deionized water, and obtaining the semi-metal carbon nitride by using a thermal polymerization method; dissolving iron chloride hexahydrate and 1,4-benzenedicarboxylic acid in dimethylformamide, and then adding the semi-metal carbon nitride, and obtaining the semi-metal carbon nitride / metal organic framework MIL-53Fe heterojunction photocatalyst by using a hydrothermal method. The formation of the heterojunction can greatly improve the photocatalytic reduction activity of the semi-metal carbon nitride / metal organic framework MIL-53Fe on carbon dioxide.

The application relates to the technical field of metal organic framework material preparation, and provides a metal organic compound and a preparation method thereof, the molecular formula of the metal organic compound is Zr6O m (OH) n (OL) 6‑(x+y) / 2 (sol) x (blank) y N b , 4<=m<=6, 0<=n<=4, 0.09<=x<=0.92, 1.8<=y<=6.02, 0.9<=b<=6.94; wherein, OL is a double-carboxyl conjugated organic ligand, sol includes at least one of acetate, formate and CH3(CH2) p COO ‑ , 1<=p<=6, blank is a ligand vacancy, and N is a counter ion; the unsaturated coordination defect rate of the metal organic compound is 15%-50.1%.

The application discloses a two-dimensional metal organic framework nanopore sensor and a preparation method and application thereof. The two-dimensional metal organic framework nanopore sensor comprises a two-dimensional metal organic framework film with first nanopores, a silicon nitride film with second nanopores and a silicon substrate which are sequentially stacked, the two-dimensional metal organic framework film is formed through liquid-liquid interface force self-assembly and is transferred in situ to the silicon nitride film to form. The two-dimensional nanopore film material adopted by the application is a metal organic framework of a porphyrin organic ligand, the hydrophobic porphyrin ligand has high affinity with DNA molecules and can interact with the DNA molecules, so that the speed of the DNA passing through the two-dimensional nanopore is slowed down, the problem of fast pore passing speed when the two-dimensional nanopore sensor detects and distinguishes short-chain DNA is solved, and the time resolution capability of the two-dimensional nanopore is greatly improved under the premise of guaranteeing high spatial resolution of the two-dimensional nanopore.

The application discloses a preparation method of an environment-friendly chitosan-based heavy metal adsorption air-precipitated bead, and comprises the following steps: preparing chitosan water-precipitated beads through acid-base neutralization solidification, loading the ammonia metal organic framework UiO-66-NH2 prepared through hydrothermal reaction on the chitosan water-precipitated beads through Schiff base reaction of a crosslinking agent, and then further loading polyethylene imine on the composite water-precipitated beads through the same loading means. The CS-UiO-GA-PEI-GA air-precipitated bead adsorbent is prepared through freeze-drying of the water-precipitated beads by a freeze dryer. The secondary crosslinking method gives the adsorbent certain mechanical strength, and provides a basis for regeneration and circulation of the adsorbent; the nitrogen-rich polyethylene imine and the high-porosity UiO-66-NH2 greatly enrich the active adsorption sites of the adsorbent, and significantly improve the adsorption capacity of the adsorbent for Cr(VI); and the removal rate of the adsorbent for Cr(VI) is up to 100% in the detection limit range of Cr(VI).

The application discloses a kind of nanocomposite based on Ti3C2 and its preparation method and application.It relates to the field of electrochemistry.The above-mentioned nanocomposite based on Ti3C2 includes the following components: Ti3C2, reduced graphene oxide, beta-cyclodextrin-metal organic framework material, IAA antibody and adhesive.The above-mentioned nanocomposite based on Ti3C2 of the application has excellent specificity for IAA, can realize high sensitivity and high stability detection of IAA, can realize detection of IAA concentration from 0.01-10ng / mL at least, and the detection limit reaches 2.88pg / mL (S / N=3).

The application provides an ultramicroporous zinc-based MOF material, a preparation method thereof and application thereof in ammonia adsorption, and belongs to the technical field of crystalline materials. The material is an ultramicroporous zinc-based metal organic framework material with a three-dimensional periodic network structure, which is formed by coordination self-assembly of Zn 2+ ions, squarate ligands and triazoles ligands, wherein Zn 2+ ions exist in two coordination modes of hexa-coordinated octahedron and tetra-coordinated tetrahedron; the molecular formula of the material is [Zn2(C4O4)(C2H2N3)2], wherein C4O4 2‑ is a squarate ligand, and C2H2N3 ‑ is a triazole ligand. The application also provides application of the ultramicroporous zinc-based MOF material in ammonia adsorption. The MOF material has good stability, can maintain the integrity of the framework structure after being soaked in water for 7 days, and has good ammonia adsorption performance.

The present application relates to the technical field of water-soluble fertilizer, and particularly relates to a trace element water-soluble fertilizer and a preparation method thereof.The fertilizer is composed of the following components in weight units: 200 g; 58.21 g; 200 g; 110 g; a lanthanide metal organic framework (MOF) 20 g; the fertilizer is diluted to 1 L, and the pH value of the system is 4.0.The present application introduces lanthanum into the trace element water-soluble fertilizer to modulate MOF-808, and utilizes the high-pore structure of MOF-808 to realize efficient loading and slow-release controlled release of nutrients such as zinc, copper, manganese and iron, thereby significantly improving the nutrient utilization rate and reducing the loss.The introduction of lanthanum not only optimizes the carrier performance, but also produces a synergistic effect with the trace and secondary elements, and experimental data confirms that the fertilizer can significantly promote the development of watermelon fruits, significantly improves the single fruit weight and yield per mu under the premise of not changing the fruit peel thickness, and has significant yield-increasing benefits and good physical and chemical stability.

This invention discloses a thermochromic smart window, which contains at least one layer of thermochromic material. The core functional material of the thermochromic material is a core-shell structured thermochromic material, with doped vanadium dioxide nanoparticles as the core and a metal-organic framework as the shell. The thermochromic smart window of this invention exhibits high stability, good optical properties, and the ability to achieve synergistic photothermal response, making it particularly suitable for home use. Furthermore, its preparation method is simple, requires mild conditions, and is highly compatible with existing laminated glass manufacturing processes, facilitating industrialization. It not only responds to changes in ambient temperature but also sensitively responds to changes in solar radiation intensity, achieving intelligent regulation of solar thermal energy.

The invention relates to the technical field of gas adsorption materials, in particular to a dissimilar metal-organic framework confinement polyaniline composite adsorbent and a preparation method and application thereof. The preparation method comprises the following steps: adopting chromium-copper dissimilar metal matching, and constructing a stable Lewis acid site in an MIL-101 skeleton; introducing a sulfonic acid group through a ligand exchange strategy, and establishing a Bronsted acid site; and finally, carrying out confinement polymerization on aniline in MOF pore channels to form rich hydrogen bond binding sites so as to obtain the dissimilar metal-organic framework confinement polyaniline composite adsorbent. According to the dissimilar metal-organic framework confined polyaniline composite adsorbent disclosed by the invention, through triple synergistic effects of dissimilar metal Lewis acid sites, sulfonic acid group Bronsted acid sites and polyaniline hydrogen bond sites, a multiple ammonia gas capture mechanism is constructed, and the adsorption efficiency and adsorption effect on ammonia gas are remarkably improved.

The present application relates to a kind of for CO2 hydrogenation methanol hydrophobic core-shell catalyst and its preparation method and application, belong to catalyst preparation technical field.Zirconium-based metal organic framework UiO-66 is core body, outer layer constructs hydrophobic mesoporous silica shell layer to form core-shell structure carrier.The carrier is pre-wetted with solvent before metal introduction, and copper, zinc nitrate precursor is introduced under the condition, and its wetting, penetration and migration process in channel are controlled, so that it can penetrate hydrophobic mesoporous shell layer and transport to core-shell interface and UiO-66 core surface.Subsequently, by adjusting metal deposition kinetics, copper zinc species is selectively deposited and forms active component enrichment at interface.Preferably, by controlling metal loading process, copper zinc active component is enriched and controllably distributed in hydrophobic core-shell structure, so as to improve the stability and catalytic performance of catalyst in CO2 hydrogenation methanol reaction.

The application relates to a ligand-regulated CuCe-MOF catalyst and a preparation method and application thereof in an electrocatalytic CO2 methane production reaction, and the preparation method comprises the following steps: mixing a Ce solution, an organic ligand solution and a structure directing agent to obtain a mixed solution; the organic ligand is terephthalic acid, 1,4-naphthalene dicarboxylic acid, diphenyl dicarboxylic acid or triphenyl dicarboxylic acid; the mixed solution is centrifuged and dried to obtain a cerium-based metal organic framework powder; the cerium-based metal organic framework powder is dispersed in a third solvent, ultrasonated, and soluble Cu salt is added, and after stirring, the third solvent is volatilized by heating to obtain the CuCe-MOF catalyst. The CuCe-MOF is prepared by using the organic ligand with a single benzene ring, a double benzene ring and a triple benzene ring, the dual synergistic optimization of ligand electronic effect and protonation efficiency is realized, the methane selectivity is greatly improved in the CO2 electro-reduction, and a brand-new synergistic regulation strategy is provided for the structural design and performance optimization of a CO2 RR electro-catalyst.

The application discloses a preparation process and material of a lithium battery positive electrode material and belongs to the technical field of battery materials. The process obtains the positive electrode material with the metal oxide@carbon composite nanosheet coated on the surface through in-situ growth of the metal organic framework nanosheet on the surface of the manganese-based positive electrode material and gradient carbonization. The key lies in that triethylamine and hexadecyl trimethyl ammonium bromide are used as the synergistic structure directing agent to control the nanosheet morphology, and the conversion from the MOF to the stable composite layer is realized through the three-step gradient carbonization process. The material has the characteristics of uniform coating, strong combination, and excellent ion / electron transmission channel, and significantly improves the specific capacity, rate performance and cycle life of the battery.

This invention discloses a composite material of carbon-supported silicon nanodots derived from a hierarchical porous metal-organic framework (MOF), relating to the field of lithium-ion battery anode materials. The invention includes preparing a hierarchical porous MOF precursor with both micropores and mesopores; converting the precursor into a hierarchical porous carbon framework through controlled heat treatment; confining the growth of silicon nanodots within the mesopores of the carbon framework via vapor deposition; and removing residual metals by acid washing to obtain a purified target composite material. By using a MOF with a hierarchical porous structure as a precursor and combining it with vapor deposition technology, this invention enables the in-situ construction of uniformly dispersed silicon nanodots within the mesopores of the derived carbon framework, while simultaneously maintaining an efficient ion transport network using a microporous system.

This invention discloses a method, system, and storage medium for predicting the adsorption performance of metal-organic framework (MOF) materials for noble metal ions in solution, belonging to the field of noble metal resource recovery. The method includes: collecting and organizing experimental data; organizing, screening, and quantifying the data to form a database; dividing the database into training and testing sets; constructing a stacked ensemble machine learning model for training; performing hyperparameter tuning using Bayesian optimization; using the tuned model for prediction to obtain the model's predictive performance; fitting the model using partial least squares (PLS) to calculate the importance scores of different variables, analyzing their influence on the amount of noble metal ion adsorption, and removing variables with low importance scores; using the trained stacked ensemble model to predict new experimental data and evaluating the predictive effect of the stacked ensemble model on the adsorption performance of MOFs. This invention can improve the accuracy of predicting the adsorption performance of MOF materials for noble metal ions in solution.

The application discloses a super-hydrophobic carbon dioxide selective permeation membrane and a preparation method and application thereof, and belongs to the technical field of functional polymer composite materials and gas separation, wherein the permeation membrane comprises a polymer matrix and modified metal organic framework fillers dispersed in the polymer matrix; the polymer matrix forms a continuous phase; and the modified metal organic framework fillers are uniformly dispersed in the continuous phase to form micro-nano interface channels. The super-hydrophobic carbon dioxide selective permeation membrane and the preparation method and application thereof can obtain a permeation membrane with a water contact angle of 110 degrees or more, can effectively block liquid water and water vapor in industrial flue gas, can eliminate the cross interference of a high-humidity environment on CO2 monitoring from the source, and has excellent CO2 permeation flux and selective separation performance.

The portable water harvesting device includes a vacuum-compatible water collection unit and a detachable lid incorporating a metal-organic framework (MOF) unit. The water collection unit comprises a vacuum pump connection port and a drain valve for extracting collected water. The detachable lid contains MOFs in the form of beads or dispersed within a porous medium, encapsulated by a vapor-permeable, MOF-retaining filter membrane. A solar-absorbing metal plate is affixed to the outer surface of the lid to facilitate thermal activation. The lid is removably attached to the collection unit via a screw-type or snap-fit closure, forming an airtight seal during vacuum desorption. Enhanced exposure of MOFs to ambient air improves water uptake, and vacuum-assisted depressurization accelerates desorption. The device is lightweight, power-independent, and suitable for deployment in off-grid or water-scarce environments such as islands, boats, or emergency lifeboats.

The application relates to the technical field of repairing materials, and particularly discloses a quick repairing material for a mine conveying belt and a preparation method thereof. The quick repairing material for the mine conveying belt comprises components A and B, and the preparation raw materials of the component A include the following components in parts by weight: polyether polyol 30-50 parts and diphenyl methane diisocyanate 45-80 parts; the preparation raw materials of the component B include the following components in parts by weight: terminal amino polyether 30-50 parts, chain extender 20-40 parts, crosslinking agent 5-10 parts, modified flame retardant 5-10 parts, antistatic agent 1-5 parts and auxiliary agent 1-5 parts; wherein the flame retardant is one of a metal organic framework flame retardant, a metal organic framework flame retardant modified by a phosphorus-based flame retardant and a metal organic framework flame retardant modified by a reaction type DOPO-based flame retardant. The spraying type quick repairing material provided by the application can ensure the physical and chemical properties of the material, and improve the flame retardant property and stability of the material.

A flushable apparatus (10) for testing a liquid specimen such as urine for a condition such as pregnancy. The apparatus includes a pliable sheet (11) that can be secured to the rim of a toilet bowl. The sheet is shaped and dimensioned to cause a flow of urine to impact a testing unit (30) such as a pH indicator patch, a biodegradable immunoassay, a metal organic framework composite containing assay, or a removable, non-flushable chromatographic strip, and to dram excess urine away from the testing unit. The apparatus can be disposed of in a convenient, environmentally responsible way. The testing unit can provide results in a color-coded manner that can be easier to read by inexperienced users.

This invention discloses a two-dimensional medium-entropy metal-organic framework catalyst, its preparation method, and its application. It belongs to the field of energy materials technology. The method involves the following steps: Ni, Co, Fe, and Mo salts are dissolved in a mixed solution of DMF, ethanol, and water. Then, terephthalic acid and TEA are added and stirred to obtain a homogeneous colloidal suspension, which is then ultrasonically treated under sealed conditions. The product is collected by centrifugation, washed, and dried to finally obtain a two-dimensional ME-MOF catalyst prepared by room temperature ultrasonic treatment. The catalyst prepared by this invention has low raw material costs, a simple preparation process, and is environmentally friendly. The material has a plate-like structure, and due to its high specific surface area and adjustable structure, it can be used for electrocatalysis.