538 results about "2-Methylimidazole" patented technology

New triterpenoid derivatives with various substituents at the C-17 position of 2-cyano-3,12-dioxooleana-1,9(11)-dien-28-oic acid (CDDO) were synthesized. Among them, 2-cyano-3,12-dioxooleana-1,9(11)-dien-28-onitrile (CNDDO), 1-(2-cyano-3,12-dioxooleana-1,9(11)-dien-28-oyl) imidazole, 1-(2-cyano-3,12-dioxooleana-1,9(11)-dien-28-oyl)-2-methylimidazole, 1-(2-cyano-3,12-dioxooleana-1,9(11)-dien-28-oyl)-4-methylimidazole show extremely high inhibitory activity (IC₅₀=0.01-1 pM level) against production of nitric oxide induced by interferon-γ in mouse macrophages. These compounds can be used in the prevention or treatment of diseases such as cancer, Alzheimer's disease, Parkinson's disease, multiple sclerosis, rheumatoid arthritis, and other inflammatory diseases. All the new triterpenoid derivatives are more potent than previously known CDDO.

The invention relates to an iron, cobalt and nitrogen codoped carbon catalyst and a preparation method and application thereof. An iron/cobalt double-metal zeolite imidazate framework material is adopted as a precursor, and the iron, cobalt and nitrogen codoped carbon catalyst is prepared and obtained through high-temperature pyrolysis, wherein the iron/cobalt double-metal zeolite imidazate framework material is prepared by adopting ferrous sulfate, cobalt nitrate and 2-methylimidazole to carry out a self-assembly reaction in a solvent under an oxygen-free environment. The iron, cobalt and nitrogen codoped carbon catalyst prepared in the invention has the advantages that the oxygen reduction catalytic activity, electrochemical stability and methanol poisoning resistance is superior to those of commercial Pt/C, the cost is low, the preparation method is simple and volume production can be realized. The catalyst disclosed by the invention can be widely applied to the fields of fuel batteries, metal-air batteries and the like.

The invention belongs to the field of super capacitors and particularly relates to a binary metal organic framework material applied to a super capacitor and a preparation method for the binary metal organic framework material. The binary metal organic framework material is formed of two types of metal ions and an organic ligand using a solvothermal method in a self assembly coordination manner. The two types of metal ions are Co-Ni, Co-Fe, Co-Mn, Ni-Mn or Ni-Cu. The organic ligand is trimesic acid, terephthalic acid, 2,6-naphthalene acid, 4,4'-biphenyl diacid or 2-methylimidazole. The binary metal organic framework material is advantaged by having multiple holes, large specific surface area and an adjustable structure, and being varied in structure. The cooperative effect between the two types of metal ions in the binary metal organic framework material (MOFs) is utilized, so that when the binary metal organic framework material is applied to the electrode material of a super capacitor, excellent cycling stability and high specific discharge capacity are achieved.

The invention discloses a ZIF-8/poly(vinyl alcohol) (PVA) composite nanofiber membrane as well as a preparation method and application thereof, belonging to the technical field of preparation of functional nanofiber membranes. The method comprises the following steps of: (1) carrying out hybrid reaction on a methanol solution of soluble zinc salt and a methanol solution of 2-methylimidazole under room temperature and purifying an obtained reaction liquid after reaction ends, thus obtaining nano ZIF-8; (2) mixing obtained nano ZIF-8 with PVA, dissolving the mixture in deionized water, stirring the mixture to swell, then carrying out stirring heating reaction and cooling the reactant to the room temperature after reaction ends, thus obtaining an electrostatic spinning solution; and (3) putting the obtained electrostatic spinning solution in an injector to carry out electrostatic spinning, thus obtaining the ZIF-8/PVA composite nanofiber membrane. The method not only has the effect of overcoming the defect that the ZIF-8 material is difficult to recover and industrially apply in a water phase but also has better selective adsorption property and can be applied to sewage treatment.

The invention discloses a large-scale adsorbing material ZIF-8 synthesizing and forming methods, and belongs to the technical field of adsorbing materials. The method comprises the steps of: pouring 70-75ml of dimethyl formamide (DMF) into a polytetrafluoroethylene liner with the volume of 100ml, and adding Zn(NO3)2.6H2O and 2-methylimidazole according to a molar ratio of 1:(2-4) to be fully dissolved; crystallizing under self-generated pressure; heating from a room temperature to a preset crystallization temperature through programs, and then preserving a constant temperature for a plurality of hours; cooling, filtering in vacuum and washing; weighing and putting ZIF-8 powder into a mortar, and adding an adhesion agent to be completely ground together; then adding a peptizing agent, and completely grinding the peptizing agent in the mortar until wet fine powder is formed; and tabletting the obtained wet fine powder through a tabletting machine so as to obtain a platy ZIF-8 mateiral. The ZIF-8 synthesized by the method has high crystallinity and good adsorption property.

The present invention provides cobaltosic oxide hierarchical structure nano array materials and a preparation method thereof, and an application of cobaltosic oxide hierarchical structure nano array materials. In a closed high temperature and high pressure reactor, redistilled water is taken as reaction solvent, cobalt salt, ammonium fluoride and urea are added into the reaction solvent for uniform mixing, and a reaction system is heated to generate a high-pressure environment to prepare cobaltous hydroxide precursor nanowire materials; then redistilled water is taken as reaction solvent, 2-methylimidazole is added into the reaction solvent, the cobaltous hydroxide precursor loaded on carbon cloth is immersed in the solution, the cobaltous hydroxide is taken as a cobalt source, the reaction system is heated and the reaction time is controlled to control a ZIF67 nucleation rate so as to prepare a cobalt-based metal organic framework (ZIF67) array; and finally, calcining decomposition ofthe cobalt-based metal organic framework (ZIF67) array is performed to obtain a cobaltosic oxide hierarchical structure. The product purity is high, the dispersibility is good, the controllability isgood, the production cost is low, the reproducibility is good, the cobaltosic oxide hierarchical structure nano array materials have cycling stability and large active surface area, and have a potential application value at the aspect of supercapacitors.

The invention provides a ternary MOF nanosheet array material as well as a preparation method and application thereof, in a high-temperature high-pressure reaction kettle, methanol is used as a reaction solvent, a nickel salt, an iron salt, a cobalt salt and organic ligand 2-methylimidazole are added according to a ratio for mixing evenly, and a high-pressure environment is generated by heating the reaction system to prepare the ternary MOF nanosheet array material. Compared with the prior art, the product obtained by the preparation method disclosed by the invention is high in purity, good indispersibility, good in reproducibility and low in production cost, and can be controlled, and a stable and uniform morphology structure is formed by controlling the dosage and concentration of the raw materials and the reaction temperature and time. The prepared ternary MOF nanosheet array material grows on foamed nickel and can be directly used as an electrode material, so that long cycling stability and large active surface area are achieved, and the ternary MOF nanosheet array material has a potential application value in the aspect of oxygen evolution reaction.

The invention discloses a ZnO@ZIF-8 core-shell structure microsphere and a preparation method thereof. The core-shell structure microsphere is formed by ZnO and ZIF-8, wherein ZnO is adopted as a core, ZIF-8 is adopted as a shell, the diameter of the spherical ZnO core is 250 to 300 nm, the surface of the spherical ZnO core is a rough surface, the thickness of the ZIF-8 shell is 40 to 60 nm, the ZIF-8 shell is formed by a block-shaped polygonal body, and the specific surface area of each microsphere is more than or equal to 300m<2>/g. The preparation method comprises the following steps: adding dihydrate zinc acetate into diethylene glycol at a weight ratio of (3.5-7.5): 250 to obtain a mixture, refluxing the mixture for at least 1h under the temperature of 140 to 180 DEG C to obtain a reaction liquid, after the reaction liquid is cooled to the room temperature, sequentially carrying out solid-liquid separation, washing and drying treatment on the reaction liquid to obtain spherical ZnO, then adding the spherical ZnO into 3.16 to 4.16 mol/L of 2-methylimidazole solution at a weight ratio of (0.008-0.012): (2.5-2.9) to obtain a mixed solution, standing and aging the mixed solution for 8 to 60 minutes, sequentially carrying out solid-liquid separation, washing and drying treatment on the mixed solution to obtain a target product. The ZnO@ZIF-8 core-shell structure microsphere is good in dispersing property and relatively large in specific surface area and can be widely applied to the fields such as gas storage, separation and catalyzing.

The invention discloses a method for synthesizing a ZIF-8 aerogel on the basis of a cellulose hard template. The method is based on a cellulose hard template and comprises the following steps: reacting 2-methylimidazole and zinc nitrate to form ZIF-8 carried on the cellulose surface, carrying out solvent washing and repeated carrying so that the ZIF-8 crystal grains uniformly grow on the cellulose surface, and finally, carrying out exchange, freeze-drying and the like to keep the aerogel structure. The ZIF-8 aerogel has larger specific area, and has certain promoting actions on researching application of metal organic frame materials in the field of gas storage. The method has the advantages of simple technique and favorable repetitiveness, uses cheap and accessible industrial raw materials, conforms to the requirements for environmental protection, and can implement mass production.

The invention discloses a sand texture type polyester/epoxy powder coating and a preparation method thereof. The sand texture type polyester/epoxy powder coating comprises the following raw materials, by weight, 350-400 parts of polyester resin (P5040), 240-280 parts of epoxy resin (E-12), 100-150 parts of extinction barium sulfate, 40-60 parts of spherical silica powder, 8-12 parts of modified polyethylene wax powder, 10-15 parts of organic coated titanium dioxide, 5-10 parts of sand texture agent (SWMBX-30), 4-6 parts of benzoin, 5-8 parts of 2-phenyl imidazoline, 4-6 parts of 2-methylimidazole, 5-10 parts of ferrite yellow, 5-10 parts of iron oxide red and 10-15 parts of carbon black. The prepared powder coating has the advantages of being high in hardness, high in intensity, high in abrasion resistance, good in heat resistance, good in ageing resistance, short in solidifying time, environment-friendly, free of pollution and the like. The solidified coating produces a texture effect of the sand texture, the sand texture is meticulous and clear, distribution is even, visual comfort is provided for people, and combination properties of the coating are good.

The invention provides a nitrogen-containing graphitized carbon material adopting double-metal MOFs (metal organic frameworks). The material is prepared with a method as follows: S1, 2-methylimidazole is dissolved to form a solution A, cobalt salt and zinc salt are mixed to form a solution B, the solution A and the solution B are mixed, left to stand, centrifugalized, washed and dried, and double-metal MOF precursors are obtained; S2, the double-metal MOF precursors formed in S1 are calcined in an inert gas atmosphere, and the calcined double-metal MOF precursors are obtained; S3, the calcined double-metal MOF precursors formed in S2 are mixed with triphenylphosphine or tributyl phosphate in a solution, the mixture is calcined in an inert gas atmosphere, washed and dried, and the nitrogen-containing graphitized carbon material adopting the double-metal MOFs is obtained. The invention provides a highly-graphitized porous carbon material which is high in specific surface area and hierarchically porous, realizes uniform nitrogen doping and contains rich metal-nitrogen structures, the activity of the product in oxygen evolution through water electrolysis is more excellent than that of commercial ruthenium oxide, and the material has great application prospects in energy storage materials.

The invention discloses a graphene loaded Co-N-C oxygen reduction catalyst and a preparation method thereof. Electrostatic self-assembly is adopted to anchor ZIF-67 on the surface of graphene and then high temperature carbonization is carried out to prepare the oxygen reduction catalyst. The method comprises the following specific steps: 1. adding oxidized graphene to water, stirring at room temperature, and centrifuging to collect obtained precipitate I; 2. adding a 2-methylimidazole solution to the obtained precipitate I, stirring at room temperature, and centrifuging to collect a precipitate II; then adding a cobaltous acetate solution to the precipitate II, stirring at room temperature, and centrifuging to collect a precipitate III; 3. repeating step 2 for 2-10 times and then drying; 4. carrying out constant temperature carbonization treatment on the dried product at the atmosphere of inert gas. The nano-structure graphene prepared according to the invention has good stability and conductivity, can form a cobalt-carbon-nitrogen catalytic active center with ZIF-67, is favorable for quick transfer of electrons, can enhance the catalytic capacity of the obtained catalyst for oxygen, and is suitable for popularization and application.

The invention discloses a preparation method of a microwave absorbing material taking a MOFs molecular structure as a template, which comprises the following steps: synthesizing water-soluble Fe3O4 nanoparticles by using a hydrothermal method, and dispersing the Fe3O4 nanoparticles in a methanol solution for standby application; ultrasonically dispersing a required amount of 2-methylimidazole and the solution obtained in the step 1 in a methanol solution, and marking the obtained solution as liquid A; dissolving a required amount of CoCl2 and polyvinylpyrrolidone K30 in a methanol solution, and marking the obtained solution as liquid B; under the condition of mechanical agitation, gradually adding the liquid B in the liquid A, and after the two kinds of liquid are mixed, continuing to agitate for several hours, standing the obtained mixed solution, and carrying out magnetic separation processing, so that solid powder is obtained; and calcinating the solid powder obtained in the step 3 for 0.5-6 hours in a nitrogen atmosphere, so that a porous carbon coated FeXCo(1-x) alloy can be obtained. The preparation method disclosed by the invention is low in production cost, simple in preparation process, and suitable for industrialized mass production.

The invention discloses a mono-dispersed nitrogen doped hollow carbon nano polyhedron and a preparation method thereof. The mono-dispersed nitrogen doped hollow carbon nano polyhedron takes a ZnO nano-sphere as a template and a Zn source and 2-methylimidazole as organic ligands to synthesize a core-shell-structure ZnO@ZIF-8 nano mono-crystal composite material; the core-shell-structure ZnO@ZIF-8 nano mono-crystal composite material is put into a high-temperature furnace and is calcined in an inert gas atmosphere for 2h to 4h, wherein the calcination temperature is 800 DEG C to 900 DEG C; after calcination, a carbon nano material with a hollow structure is directly obtained. A preparation process disclosed by the invention is simple, and a template removing process is not adopted. The carbon nano material with the hollow structure, which is prepared by the method disclosed by the invention, has a uniform polyhedron shape, a high specific surface area and high nitrogen content, and has a great application potential in the fields including electrochemical energy storage, catalysis, fuel batteries and the like.

The invention relates to a double-metal MOF (Metal-Organic Framework) catalyst. Two inorganic metal centers and an organic ligand are self-assembled through a coordination bond to form a three-dimensional cage-shaped structure; the specific surface area is 170 to 1,145m<2>/g, the pore capacity is 0.18 to 0.48cm<3>/g and the average pore diameter is 1.34 to 3.55nm; any two types of nitrate of metalcopper, nickel, cobalt and cerium are used as metal precursors, one of trimesic acid, 2-methylimidazole or terephthalic acid is used as a synthesis ligand and a suitable solvent is selected to synthesize the double-metal MOF catalyst. A double-metal MOF material is used as a catalyst and p-diethylbenzene is used as a raw material; the p-diethylbenzene is catalytically oxidized in a fixed bed to prepare p-ethylacetophenone. The method provided by the invention has the advantages of mild reaction conditions, simplicity in operation, high p-diethylbenzene conversion rate and high p-ethylacetophenone selectivity; a product and the catalyst are easy to separate and the catalyst is stable in performance; reaction is applied to fixed bed reaction to realize continuous production, so that the method has a wide industrial application prospect.

The invention discloses a preparation method of nitrogen-doped three-dimensional porous carbon loaded with nano cobalt and an application thereof in lithium sulfur batteries. The method includes the following steps: preparing precursor solution containing an inorganic nanosphere template; preparing a precursor by using cobalt salt and 2-methylimidazole as a cobalt source, a carbon source and a nitrogen source and using inorganic nanospheres as a template, and carbonizing and reducing the precursor at high temperature; and finally, removing part of the template and part of metal cobalt to obtain nitrogen-doped three-dimensional porous carbon loaded with nano cobalt. According to the preparation method provided by the invention, the precursor is prepared through a stirring evaporation solvent method by using cobalt salt as a cobalt source, 2-methylimidazole as a carbon source and a nitrogen source and inorganic nanospheres as a template, which makes the yield of the precursor close to 100%, can improve the yield of the final product, namely, the nitrogen-doped three-dimensional porous carbon loaded with nano cobalt, and is beneficial to large-scale production and preparation. The three-dimensional porous carbon prepared by the preparation method can be used in lithium sulfur batteries to improve the sulfur loading capacity and electrochemical performance of lithium sulfur batteries.

The invention relates to an organic metal framework derived cobalt/nitrogen carbon nano material as well as a preparation method and application thereof. The preparation method comprises the followingspecific steps: (1) stirring and dissolving Co(NO3)<2>.6H2O in methanol to prepare a Co(NO3)2 solution; stirring and dissolving 2-methylimidazole in methanol to prepare a 2-methylimidazole solution;pouring the 2-methylimidazole solution into the Co(NO3)2 solution, standing and aging the mixture at room temperature, centrifuging the mixture, and washing and drying a product to obtain ZIF-67; and(2) carrying out annealing treatment on the ZIF-67 obtained in the step (1), and carrying out acid pickling, water washing and drying to obtain the cobalt/nitrogen carbon nano material. Compared withthe prior art, the cobalt/nitrogen carbon material prepared by the method has the advantages of low metal dissolution, good reusability, a simple and convenient operation process, a wide pH application range and the like when being used for activating peroxydisulfate, and has wide application prospects in the field of treatment of degradation-resistant organic matter wastewater.

The invention discloses a porous carbon-coated ZnO nanocomposite material and a preparation method thereof. The present invention adopts a simple method of coating and calcining to synthesize porous carbon-coated ZnO nanocomposite material, and the preparation process is simple. First, 2-methylimidazole and ZnO nanoparticles are used as raw materials to construct ZnO heterostructure material, and then The obtained material is calcined to obtain a layer of porous carbon nanocomposite material supported on the ZnO surface. That is, the porous carbon-coated ZnO nanocomposite material is obtained; the prepared material has great application prospects in the field of degrading organic dyes.

The invention discloses a preparation method for a super-hydrophobic metal-organic framework array. The method is implemented by the following steps: performing ultrasonic treatment and drying on an inorganic or organic material adopted as a substrate in an organic solvent to obtain a pretreated substrate; dissolving zinc nitrate hexahydrate, 2-methylimidazole and anhydrous sodium formate in ethanol, performing ultrasonic treatment, then adding the pretreated substrate, and performing reaction for 5 to 10h under the condition of 50 to 150 DEG C to obtain a ZnO array; dissolving benzimidazole in N,N-dimethylformamide, performing ultrasonic treatment, then adding the ZnO array, and performing reaction for 10h under the condition of 80 to 140 DEG C to obtain the super-hydrophobic metal-organic framework array. The super-hydrophobic metal-organic framework array may be applied to the field of oil-water separation; super-hydrophobicity can still be achieved under the condition of modification with no low-surface energy substance, and the array has relatively high thermal stability, and can be used for efficiently separating multiple oil-water mixtures.

The invention provides a preparation method of a MOFs nano material supporting nano metal particles. The method comprises the following steps: step 1: uniformly mixing a 2-methylimidazole methanol solution and a zinc nitrate methanol solution, and carrying out standing to obtain ZIF-8 particles with uniform distribution of particle diameters; step 2: dispersing the ZIF-8 in a methanol solution containing cobalt nitrate, 2-methylimidazole and metal nano particles, carrying out ultrasonic treatment and uniform stirring, and carrying out a reaction to obtain purple solid powder; and step 3: dispersing the purple solid powder in a methanol solution of zinc nitrate and 2-methylimidazole, carrying out ultrasonic treatment and uniform stirring, carrying out a reaction, and carrying out washing and drying after the reaction is finished, so as to obtain the MOFs nano material supporting nano metal particles with a sandwich structure. The preparation method has cheap and easily obtained raw materials, mild and controllable conditions, and no pollution to the environment; the synthesized MOFs nano material supporting metal nano particles has a sandwich structure, and the supported metal is uniformly dispersed in the interlayer, so that the stability and selectivity of the catalyst are improved.

The invention relates to a preparation method of a positive electrode material of a lithium-sulfur battery. The preparation method comprises the following steps of enabling cobalt nitrate and 2-methylimidazole to be dissolved into a solvent and performing standing, centrifuging and drying to obtain ZIF-67; performing carbonization on ZIF-67 in inert atmosphere and performing cooling to the room temperature to obtain Co-N-C; and performing carbonization on Co-N-C and dicyandiamide in the inert atmosphere, and performing cooling to the room temperature to obtain CNT@ Co-N-C. The lithium-sulfur battery comprises the positive electrode material used for the lithium-sulfur battery. Beneficial effects are achieved as follows: compared with the single metal organic framework compound-based composite material, the specific surface area and the conductivity of the positive electrode material disclosed in the invention are enlarged and improved, and sulfur load can be realized more effectively;in addition, a shuttle effect of polysulfide in the battery reaction process can be suppressed more effectively; and a constant-current discharge test on the assembled battery proves that the electrochemical performance of the composite material with the carbon nanotubes in an in-situ growth manner is more excellent.

The invention discloses a ZIF-8/PVDF (Polyvinylidene Fluoride) ultra-filtration membrane with a catalysis effect at room temperature as well as a preparation method and application thereof. The preparation method comprises the following specific steps: (1) uniformly blending polyvinylidene fluoride, 2-methylimidazole, an additive and a solvent to prepare a membrane casting solution; (2) after stirring the membrane casting solution for 6h to 12h, standing and de-foaming for 8h to 12h; (3) taking an isopropyl alcohol water solution as a gel bath and adding zinc nitrate hexahydrate into the gel bath; (4) synthesizing ZIF-8 on a membrane at room temperature through an in-situ growth method, so as to obtain the ZIF-8/PVDF ultra-filtration membrane with the catalysis effect. The method disclosedby the invention has a simple membrane preparation technology and can be used for effectively preventing particles from being agglomerated; on the basis, the membrane also has the certain catalysis effect and has a high interception rate on an ovalbumin salt water solution (OVA salt water solution) and a good interception flux; the method is a novel method for preparing the ultra-filtration membrane with the catalysis effect by utilizing an MOF (Metal Organic Framework).