70 results about "Zeolitic imidazolate framework" patented technology

A method of removing hydrogen sulfide from a subterranean geological formation includes mixing a zinc-imidazolate material, ZIF-8, in an amount of 0.1 to 2.5 percent by weight with an organic liquid containing one or more unsaturated oils to form a drilling fluid suspension with a pH of 10 or more. The method includes injecting the drilling fluid suspension in the subterranean geological formation, circulating the drilling fluid suspension in the subterranean geological formation to form an oil-based mud, and scavenging hydrogen sulfide from the subterranean geological formation.

A method of removing hydrogen sulfide from a subterranean geological formation includes mixing a zinc-imidazolate material, ZIF-8, in an amount of 0.1 to 2.5 percent by weight with an organic liquid containing one or more unsaturated oils to form a drilling fluid suspension with a pH of 10 or more. The method includes injecting the drilling fluid suspension in the subterranean geological formation, circulating the drilling fluid suspension in the subterranean geological formation to form an oil-based mud, and scavenging hydrogen sulfide from the subterranean geological formation.

The invention relates to a composite membrane of a zeolite imidazate framework (ZIF-71) and a polypropylene (PP) membrane in a metal organic framework, a preparation method of the composite membrane and application of the composite membrane in a non-aqueous flow battery, belongs to the technical field of flow batteries, and provides a ZIF-71 / PP composite membrane which is prepared through different in-situ growth methods and has different surface appearances. The in-situ grown 2-nitroimidazole zinc zeolite imidazate framework layer with different morphologies can effectively prevent active substances from crossing and crossing in the non-aqueous flow battery. In addition, the excellent performance of the non-aqueous flow battery verifies that the composite diaphragm of the metal organic framework and the polypropylene can still keep the structural integrity during long-term operation in an organic medium.

The invention discloses an application of a zeolite imidazole framework material in catalysis of a carbon-carbon condensation reaction of formaldehyde. The zeolite imidazole framework material is selected from ZIF-Co / IM, ZIF-Co / 2-MIM, ZIF-Co / 2-EIM, ZIF-Co / 2-PIM, ZIF-Co / 2-BIM, ZIF-Co / 4-MIM, ZIF-Co / dClIM, ZIF-Co / Pur, ZIF-Co / BzIM, ZIF-Co / 2-NIM or ZIF-Zn / 2-MIM. The zeolite imidazole skeleton nano-enzyme material can catalyze formaldehyde FA to generate carbon-carbon condensation so as to generate high value-added saccharide small molecules. Through comparison with a high performance liquid chromatogram of a standard substance, catalytic products are mainly C3 compounds glyceraldehyde (GCA) and dihydroxyacetone (DHA), and a small amount of C4 compounds comprise erythritol, threonose and ketulose. Compared with the traditional formaldehyde enzyme, the formaldehyde enzyme has the advantages of high-concentration substrate tolerance, high-temperature resistance and the like.

The invention discloses a waste lithium iron phosphate electrode material coupled metal organic framework derived composite catalyst and preparation and organic pollutant treatment application thereof.The method comprises the steps that pretreated waste lithium iron phosphate electrode material (sLFP) powder and a zinc-based zeolite imidazole framework (ZIF-8) are mixed according to a specific mass ratio, high-temperature calcination is conducted in an inert atmosphere, and the metal organic framework derived composite catalyst is obtained; and tight coating and coupling of a ZIF-8-derived nitrogen-doped carbon skeleton on a LiFePO4 phase obtained by reconstruction after sLFP pyrolysis are realized, so that a novel composite catalyst with high specific surface area, excellent conductivity and rich active sites is obtained. According to the method, recycling high-added-value conversion of waste electrode materials is achieved, the degradation rate of a Fenton-like reaction system constructed by the obtained composite catalyst and peroxymonosulfate (PMS) in cooperation on refractory organic pollutants such as sulfamethoxazole (SMX) at the normal temperature reaches 98.5% or above, the excellent catalytic stability and the green integrated treatment advantage that waste is treated with waste are achieved, and the method is suitable for industrial production. Wide engineering application prospects are realized.

An electrocatalyst comprising bismuth nanodot-doped zinc materials is used for electrochemical reduction of carbon dioxide to formate. The electrocatalyst consists of bismuth nanodots dispersed on a zeolitic imidazolate framework-8 wherein the bismuth-zinc material is in the form of particles with a longest dimension of 200 to 1000 nm. The bismuth-zinc material is utilized in H cell, flow cell, and MEA cell applications for carbon dioxide reduction.

A method for preparing an MOF-based glucose detection system, wherein a Zeolitic Imidazolate Framework (ZIF) is used as a metal-organic framework, and glucose oxidase (GOx) is loaded in the zeolitic imidazolate framework. The preparation method comprises the following steps: S1: adding water to a reaction flask in advance, and then sequentially adding a metal ion, an enzyme and an organic ligand in a molar ratio of 100-1500:1-10:1-150, and 0.1-0.5% (by weight) of ammonia water to the reaction flask, S2: mixing and reacting same at room temperature for more than 6 hours, and S3: after centrifugation by means of a centrifuge, removing the supernatant to obtain a solid precipitate of the Gox-MOF material loaded with glucose oxidase. A sensor for detecting trace glucose concentration in saliva, and an oral glucose meter comprising the sensor.

The invention relates to the technical field of adsorption composite materials, in particular to a zeolite imidazate framework closed nickel composite material and a preparation method and application thereof. The composite material is prepared from Ni-NPs (at) gZIF-8 and MgH2, the Ni-NPs (at) gZIF-8 comprises a glass state ZIF-8 and metal nickel nanoparticles loaded in a pore channel of the glass state ZIF-8. The composite material disclosed by the invention has relatively high hydrogen storage capacity, and the reversible hydrogen storage capacity of the composite material is as high as 5.7-6.0 wt%; compared with the prior art, the initial hydrogen desorption temperature is obviously reduced to 230-245 DEG C and is far lower than 325 DEG C of pure MgH2; according to the composite material with nickel sealed by the zeolite imidazate framework, through the high stability and confinement effect of the glassy state ZIF-8, the cycling stability and mechanical strength of the material are remarkably improved, and the capacity retention rate exceeds 94% after 50 times of cycling.

The present application belongs to the field of environmental protection and new energy technology, and relates to a gaseous fermentation method for improving biogas quality by using zeolite imidazolate framework structure ZIF-8 material. The ZIF-8 material for improving the biological conversion efficiency of CO2 to CH4 is prepared, and has the effect of selectively adsorbing carbon dioxide and hydrogen. When applied to gaseous fermentation, the quality of the obtained methane can be effectively improved. The ZIF-8 material prepared by the present application is applied to an anaerobic gaseous fermentation system, and only a small amount of addition can promote the biological methanation process of CO2 in the biogas, increase the proportion of methane in the biogas, improve the quality of the biogas, and make the biogas reach the standard of direct use.

The application discloses a method for preparing monophenol chemicals by catalyzing lignin depolymerization through zeolite imidazolate framework material derivatives. The method uses lignin as raw material, uses zeolite imidazolate framework material derivatives as catalyst, and uses small-molecule organic alcohol as hydrogen-donor solvent. After inert gas replacement and pressure charging to 0.5-3 MPa, the reaction temperature is controlled to 200-240 DEG C, and stirring is carried out for 2-10 h, so that selective depolymerization of lignin can be realized without external hydrogen, and monophenol chemicals mainly composed of 4-propyl-2,6-dimethoxyphenol are obtained. The method is environment-friendly, stable in performance, highly efficient in catalysis and high in selectivity, and realizes selective conversion of lignin into monophenol chemicals mainly composed of 4-propyl-2,6-dimethoxyphenol without external hydrogen.

The invention provides a stable and durable wearable sweat and sugar electrochemical sensor. A sensing interface of the sensor is prepared by sequentially dispensing a glucose sensing solution and a film forming solution on the surface of a carbon electrode, the glucose sensing solution comprises a zeolite imidazate framework-90 (ZIF-90 at GOx) composite material loaded with glucose oxidase, Prussian blue nanoparticles (PBNPs) and a conductive gel solution, and the film forming solution comprises ammonium persulfate and tetramethylethylenediamine. Glucose in sweat is oxidized by using ZIF-90 at GOx on a sensing interface, generated hydrogen peroxide reacts with PBNPs to generate a current signal on an electrode, and then quantitative analysis is performed on the glucose in the sweat based on a standard curve method. The wearable sweat and sugar electrochemical sensor provided by the invention has excellent environmental adaptability and durability, can be used outdoors for a long time, is simple to prepare and good in product performance, and has a very good application prospect in the field of development of wearable sweat and sugar sensors.

The invention discloses a fused salt heat storage material based on a lithium nitrate and polyvinylidene fluoride hybridized zeolite imidazate framework structure. The fused salt heat storage material comprises the following components in parts by mass: 20-35 parts of sodium nitrate, 25-40 parts of potassium nitrate, 10-20 parts of lithium nitrate, 10-25 parts of calcium nitrate and 0.5-2 parts of a polyvinylidene fluoride hybridized zeolite imidazate framework structure material, the polyvinylidene fluoride hybridized zeolite imidazate skeleton structure material is prepared by the following steps: step 1, adding a zinc nitrate solution into a 2-methylimidazole solution under a stirring condition, standing, carrying out a crystallization reaction, washing and drying to obtain a zeolite imidazate skeleton structure material; and step 2, mixing the zeolite imidazate skeleton structure material, polyvinylidene fluoride and dimethylformamide, and drying to obtain the polyvinylidene fluoride hybridized zeolite imidazate skeleton structure material. The fused salt heat storage material is high in specific heat capacity and low in viscosity.

The invention belongs to the technical field of environmental engineering and material science, and particularly relates to a hydroxyl-containing zinc zeolite imidazole framework material as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a zinc precursor and an imidazole ligand in proportion by adopting a mechanochemical method, mechanically grinding under the assistance of a small amount of water, washing and drying. The obtained material is of a microporous structure, the specific surface area is 500-2000 m < 2 > / g, the particle size is 20 nm-50 [mu] m, and the defect rate is high. The method has the advantages that the preparation process is green, environment-friendly, rapid, efficient and suitable for mass production, and the coordination capability can be enhanced through the synergistic effect of hydroxyl and imidazole groups of the residual raw materials. The obtained material can be used for heavy metal ion adsorption, especially has high removal rate and high adsorption capacity (50-600 mg / g) for radioactive uranium elements, and has wide application prospects in the field of environmental restoration.

Described herein are methods and systems for proposing coordination framework compounds, such as crystalline porous materials, crystalline open frameworks, network chemical compounds, metal-organic framework (MOF) compounds, covalent organic framework (COF) compounds, zeolitic imidazole framework (ZIF) compounds, and combinations thereof. Also described herein are coordination frame compounds produced by these methods and systems and adsorbent systems comprising these coordination frame compounds. The methods and systems described herein combine machine learning and chemistry to propose chemically effective and improved performance coordination framework compounds that meet the different objectives of material discovery.

The application discloses a hybrid synergistic electrochemiluminescence quencher, a preparation method and application thereof. Dopamine, zinc ions and 2-methyl imidazole are used as raw materials to synthesize polydopamine and a hybrid material of a zeolitic imidazolate framework by one-pot synthesis under alkaline conditions. The introduction of the electropositive zeolitic imidazolate framework can greatly eliminate the strong electronegativity of the polydopamine and simultaneously endow the quencher with good porosity. The quencher prepared by the application is nanospheres, has a large specific surface area and weak electronegativity, and exhibits good scavenging capacity for free radicals, especially electrogenerated anionic radicals, and has a high quenching efficiency on electrochemiluminescence. After the quencher is labeled with an antibody, the quencher is used for constructing an electrochemiluminescence immunosensor for ochratoxin A. The electrochemiluminescence immunosensor prepared by the application has a wide detection range, a low detection limit and good stability in the detection of ochratoxin A, and has a wide application prospect in the fields of electrochemiluminescence technology and the like.

To provide a porous carbon material carrying metal particles, a production method therefor, and a catalyst prepared using the same.SOLUTION: The porous carbon composite material of the present invention contains a porous carbon nanotube based on a fullerene nanotube and a porous carbon structure based on a zeolitic imidazolate framework (ZIF) positioned on the surface of the porous carbon nanotube and containing metal particles, wherein a ratio of an atomic percentage of metal particles (M) to carbon (C) constituting the porous carbon nanotube and the porous carbon structure is 0.015 or more and 0.03 or less.SELECTED DRAWING: Figure 1

The patent relates to a method for improving the preparation of sodium alginate pervaporation membrane by using two-dimensional leaf-shaped zeolitic imidazolate framework (ZIF-L) material. The pervaporation mixed matrix membrane comprises a base film and a separation layer film, the base film adopts polyacrylonitrile (PAN) film, and the separation layer is composed of ZIF-L and sodium alginate. The application improves the distribution of ZIF-L in the membrane, forms directional arrangement, and improves the separation effect and selectivity of the composite membrane. By using a new process, the defect problem of ZIF-L-SA membrane is eliminated, a continuous ultrathin ZIF-L membrane is prepared by a secondary seed growth method, and the performance of the two-dimensional ZIF-L membrane is improved. The ZIF-L synthesis condition is mild, the method is simple, the hydrophilic modification of the membrane surface is realized, the 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 broad application prospect.

The application provides a cuboid-shaped zeolitic imidazolate framework-8 nanoparticle, which comprises elements of carbon (C), oxygen (O), zinc (Zn), nitrogen (N) and manganese (Mn); and is a cuboid-shaped ZIF-8 nanoparticle with a mesoporous or microporous structure, a length-diameter ratio of (1-5):1, and elements of carbon (C), oxygen (O), zinc (Zn), nitrogen (N) and manganese (Mn) uniformly distributed in the cuboid-shaped ZIF-8 nanoparticle; and the cuboid-shaped ZIF-8 nanoparticle has good adjuvant activity. Meanwhile, the application also provides a preparation method and application of the cuboid-shaped zeolitic imidazolate framework-8 nanoparticle.

The application discloses a reflective film and a preparation method and application thereof, and belongs to the technical field of optical reflective films. The reflective film comprises a base film and a coating layer arranged on the surface of the base film; the coating layer contains a modified tetraazametallaporphyrin compound; the modified tetraazametallaporphyrin compound has a core-shell structure, the inner core is tetraazametallaporphyrin, and the outer shell is a zeolitic imidazolate framework; the chemical formula of the tetraazametallaporphyrin is: R1-R8 independently include: a hydrogen atom, a halogen element, a branched or cyclic aliphatic hydrocarbon group with 3-10 carbon atoms, an aromatic hydrocarbon group, a hydroxyl group, a sulfonic acid group or an amino group; M is a divalent metal ion; the zeolitic imidazolate framework contains Zn for coordination with N in the tetraazametallaporphyrin 2+ . The reflective film is resistant to light and has a wide color gamut. The reflective film can be further used in display devices.

An electrocatalyst comprising bismuth nanodot-doped zinc materials is used for electrochemical reduction of carbon dioxide to formate. The electrocatalyst consists of bismuth nanodots dispersed on a zeolitic imidazolate framework-8 wherein the bismuth-zinc material is in the form of particles with a longest dimension of 200 to 1000 nm. The bismuth-zinc material is utilized in H cell, flow cell, and MEA cell applications for carbon dioxide reduction.

The application discloses a zeolite imidazolate framework / polyimide nanofiber composite membrane material based on cobalt metal defects and a preparation method and application thereof, constructs a nanofiber membrane with polyimide as a base, secondly, adopts an in-situ synthesis method of first impregnating a cobalt salt and then introducing a ligand, makes ZIF-67 nucleate and grow on the surface of the PI fiber, forms a firm anchoring structure, prevents particle agglomeration and ensures uniform distribution of active sites, finally, introduces controllable metal defects by immersing in a second metal salt solution, breaks the crystal symmetry to increase unsaturated coordination sites, significantly enhances the electrostatic adsorption and chemical capture capacity on fine particulate matters, simultaneously optimizes the pore structure, strengthens the interception effect under the premise of not increasing the pressure drop, and realizes the high-efficiency-low-resistance balance. The composite structure has high removal rate, low pressure drop and excellent flexibility.

The invention discloses a molecular imprinting colorimetric sensor for detecting hepatitis B virus as well as a preparation method and application of the molecular imprinting colorimetric sensor. The sensor takes an aminated zeolite imidazate framework material (ZIF-8-NH2) with peroxidase-like activity as a catalytic core, after surface double-bond functionalization, a molecularly imprinted polymer (MIPs) layer is constructed on the surface through a free radical polymerization reaction by taking the aminated zeolite imidazate framework material as a carrier and taking HBV as a template molecule. According to the sensor, after HBV is specifically recognized and captured through MIPs, the catalytic efficiency of ZIF-8 on hydrogen peroxide is changed, then the generation amount of hydroxyl radicals is regulated and controlled, and finally visual and quantitative detection of HBV is achieved through the color fading reaction of the hydroxyl radicals and chromogenic dye crystal violet. The sensor prepared by the invention has the advantages of high sensitivity, strong specificity, low cost, simplicity and convenience in operation, rapidness in detection and the like, and can be used for rapid screening and on-site instant detection of hepatitis B viruses.

The invention discloses an amorphous zeolite imidazate framework immobilized enzyme as well as a preparation method and application thereof, and belongs to the field of functional composite materials. The method adopts a bionic cascade strategy and comprises the following steps: firstly, quickly immobilizing crude enzyme by using cationic polyethyleneimine functionalized nanospheres through electrostatic adsorption, and pre-enriching zinc ions by amino groups on the surface of the crude enzyme to construct a local reaction microenvironment; then, sodium alginate and substoichiometric 2-methylimidazole are introduced, rapid heterogeneous nucleation is triggered by utilizing the bionic coordination capability of the sodium alginate, and a continuous amorphous zeolite imidazate framework protective layer is formed around the enzyme and the nanospheres through synergistic induction. The core innovation of the invention lies in that directional deposition of an amorphous framework is realized through dynamic control by utilizing the synergistic effect of polyethyleneimine functionalized nanospheres and sodium alginate, and the nano armor structure provides super-strong stability while eliminating a crystalline diffusion barrier; and a brand-new universal platform is provided for constructing a high-performance immobilized enzyme catalyst.

An electrocatalyst comprising bismuth nanodot-doped zinc materials is used for electrochemical reduction of carbon dioxide to formate. The electrocatalyst consists of bismuth nanodots dispersed on a zeolitic imidazolate framework-8 wherein the bismuth-zinc material is in the form of particles with a longest dimension of 200 to 1000 nm. The bismuth-zinc material is utilized in H cell, flow cell, and MEA cell applications for carbon dioxide reduction.

A drug delivery system including a zeolitic imidazolate framework-8 (ZIF-8), silica, platinum nanoparticles, and polyethylene glycol. The silica penetrates the pores of the ZIF-8 and at least partially envelopes the ZIF-8 to form a ZIF-8 / silica composite. The platinum nanoparticles are present on the surface of the ZIF-8 / silica composite, and the polyethylene glycol surrounds the platinum nanoparticles present on the surface of the ZIF-8 / silica composite.

The application discloses a solar water evaporation and adsorption material, a preparation method and application thereof, and belongs to the technical field of wastewater treatment. A polydopamine modified zeolitic imidazolate framework material is stirred and reacted with a pre-oxidized nanocellulose solution and a polyvinyl alcohol solution to form a viscous liquid, the viscous liquid is transferred into a mold, and static bubble removal, freeze forming and freeze drying are sequentially performed, so that a solar water evaporation and adsorption material formed by pre-oxidized nanocellulose and polyvinyl alcohol and loaded with the polydopamine modified zeolitic imidazolate framework material is obtained. The solar water evaporation and adsorption material has the characteristics of high stability, and simultaneously has photo-thermal conversion function and rare earth ion adsorption activity. Solar radiation can be used to promote water evaporation, accelerate the mass transfer of rare earth ions in the aqueous solution and the combination of the adsorption active sites, so that the adsorption kinetics of the rare earth ions is accelerated, and the solar water evaporation and adsorption material can be used for rare earth wastewater treatment, especially low-concentration rare earth wastewater treatment.

The invention provides a nickel-doped zeolite imidazate skeleton-8 / epoxy resin anti-corrosion coating and a preparation method thereof, and belongs to the technical field of corrosion and coatings. The method comprises the following steps: (1) dissolving a zinc metal salt and a nickel metal salt in a mixed solvent of methanol and pure water according to a molar ratio of 1: 4-2: 1 to obtain a solution A; dissolving an organic ligand in a mixed solvent of methanol and pure water to obtain a solution B; (2) mixing the solution A and the solution B, stirring at room temperature, separating and collecting a solid product, washing and drying; and (3) dispersing the nickel-doped zeolite imidazate skeleton-8 nanoparticles obtained in the step (2) in an organic solvent, adding epoxy resin, uniformly mixing, then adding a curing agent, and continuously uniformly mixing to obtain a coating solution. According to the nickel-doped zeolite imidazate skeleton-8 particles disclosed by the invention, the intelligent release characteristic, the inhibition function and the stability in water can be improved while the structural integrity is ensured, so that the barrier property and the protection capability of an epoxy coating in a corrosive environment are enhanced.

A cement paste composition includes a curable component including a cementitious material and a zeolitic imidazolate framework-67 (ZIF-67) present in an amount of 0.01 to 3% by weight based on a total weight of the cementitious material. The composition further includes water in an amount of 30 to 50% by weight based on a total weight of the cement paste composition. A cured specimen made from the cement paste composition has a compressive strength of 30 to 80 megapascal (MPa) according to ASTM C109 / C109M-21 standard test method, and a direct tensile strength of 1.2 to 2.2 MPa according to ASTM C307-18 standard test method. The ZIF-67 particles are uniformly distributed throughout the cured specimen. A method of producing the cement paste specimen.

Nanoparticles and formulations for non-surgical sterilization are disclosed herein. The nanoparticles for non-surgical sterilization contains a cage, such as a zeolitic imidazolate framework (“ZIF”), a surface modifying agent, a targeting ligand, and an active agent. The surface modifying agent is attached to the outer surface of the cage and the targeting ligand is exposed to the surrounding environment. The active agent is encapsulated in the cage. The targeting ligand binds to a reproductive hormone or a receptor of a reproductive hormone. The active agents can be a ribosome inactivating protein, an apoptosis inducer, a hormone, a receptor ligand, or a nucleic acid, or a combination thereof, that inactivates the ovaries or testes. Uses for the nanoparticles and formulations incorporating the nanoparticles for sterilizing a subject in need thereof are also disclosed.