138 results about "Imidazolate" patented technology

The present invention relates to method for the synthesis in-situ of the class of compounds known generally as MOFs (metal organic frameworks or organometallic compounds), COFs (covalent organic frameworks), and ZIFs (Zeolitic imidazolate framework), within and onto different types of substrates, and to the applications of such substrates having in-situ synthesized MOFs, COFs and ZIFs.

The invention which belongs to the technical field of new materials relates to a synthetic method of ZIFs, and concretely discloses a method for synthesizing nanometer/micrometer scale ZIFs based on imidazole and its derivatives at room temperature in a concise, efficient and green manner. The method comprises the following steps: dissolving a single imidazole ligand or a mixture of two imidazole ligands in water or an organic liquid to form a solution, adding an alkaline substance to adjust the pH value of the solution, adding a metal salt to form a reaction system, and reacting to obtain the nanometer or micrometer scale ZIFs. The method which allows routine reactants to be utilized and the alkaline substance to be added to adjust the pH value of the system has the advantages of ligand application amount reduction, controllable product size, and high purity of the nanometer/micrometer scale ZIFs. The synthetic method has the characteristics of cheap and easily available raw materials and solvent, and no pollution, and has important meanings to the production and the application of the ZIFs.

Provided herein are composites made up of open frameworks encapsulating sulfur, silicon and tin, and mechanochemical methods of producing such composites. Such open frameworks may include metal-organic frameworks (MOFs), including for example zeolitic imidazolate frameworks (ZIFs), and covalent organic frameworks (COFs). Such composites may be suitable for use as electrode materials, or more specifically for use in batteries. For example, sulfur composites may be used as cathode materials in Li-ion batteries; and silicon or tin composites may be used as anode materials in Li-ion batteries.

The present invention presents a mixed-matrix composite material comprising a continuous phase and zeolitic imidazolate framework (ZIF) particles dispersed in the continuous phase, wherein the continuous phase is polybenzimidazole (PBI), methods for making the mixed-matrix composite material, and methods for separating gas or vapor from a mixture of gases or vapors using the mixed-matrix composite material.

Zeolitic Imidazolate Frameworks (ZIFs) characterized by organic ligands consisting of imidazole ligands that are either essentially all 2-chloroimidazole ligands or essentially all 2-bromoimidazole ligands are disclosed. Methods for separating propane and propene with the ZIFs of the present invention, as well as other ZIFs, are also disclosed.

Disclosed are mixed matrix polymeric membranes comprising a plurality of metal-organic frameworks (MOFs), or in some aspects a zeolitic imidazolate frameworks (ZIFs), and a polymeric matrix, wherein the plurality of MOFs are attached to the polymeric matrix through covalent or hydrogen bonds or Van der Waals interaction.

The invention relates to a preparation method of a catalytic composite material Mn3O4/ZIF-8 (Zeolite Imidazolate Framework-8) for activating PMS (Potassium Monopersulfate). The method comprises the following steps of first, preparing a ZIF-8 according to the mole ratio, which is 1 to 4 to 3 to 33 of zinc nitrate hexahydrate to 2-methylimidazole to sodium formate dihydrate to N,N-dimethyl formamide; afterwards, weighing to take potassium hypermanganate and the ZIF-8 with corresponding masses respectively according to the mass ratio, which is (0.52 to 1.04) to 1, of the potassium hypermanganate to the ZIF-8, dispersing the ZIF-8 into a 60-percent ethanol solution, sufficiently agitating an obtained first mixture, then adding the potassium hypermanganate into an ethanol solution containing the ZIF-8, sufficiently agitating an obtained second mixture, transferring the agitated second mixture into a reaction kettle, and making the transferred second mixture react for 8 hours at 120 DEG C, so as to obtain the Mn3O4/ZIF-8 composite material through centrifugation, multiple washing and the drying at 60 DEG C for one night. In the obtained catalytic composite material Mn3O4/ZIF-8, the ZIF-8 is cauliflower-shaped; Mn3O4 is sheet-shaped, and is evenly distributed on the surface of the ZIF-8. The catalytic composite material has an excellent catalytic effect on the PMS; the degradation rate, on rhodamine B, of the PM aSctivated through the composite material reaches 81 percent to 99 percent.

The invention discloses a negative electrode of a lithium battery for inhibiting the growth of lithium dendrites with a ZIF-8 porous carbon material, and belongs to the technical field of negative electrodes of lithium batteries. The ZIF-8 porous carbon material is a porous carbon material prepared by annealing a zeolite imidazolate framework material ZIF-8 in an inert atmosphere; a surface of a metal lithium sheet is coated with the ZIF-8 porous carbon material through simple physical coating to form a porous carbon-coated metal lithium negative electrode. The lithium battery can effectivelyinhibit the growth of the lithium dendrites on the surface of the negative electrode during charging and discharging, not only has superior cycling performance, but also reduces safety hazards in useof batteries, and can be used for the negative electrodes of commercial large lithium batteries.

The invention discloses a quercetin drug-loading system based on a copper sulphide-metal organic frame material. A metal organic frame zeolite imidazolate framework material (ZIF-8) is generated on the surfaces of copper sulphide nano-particles (CuS NPs) as a photothermal preparation to obtain a CuS@ZIF-8 carrier, quercetin is adsorbed into a carrier, and then is modified by a stabilizer and a targeting agent FA-BSA, and thus, a nano delivery system (FA-BSA/CuS@ ZIF-8) with a targeting active effect and pH response can be formed. The water solubility and the chemical stability of the quercetinare improved, good curative effect of treating tumors by combination of phototherapy and chemotherapy can further be played, meanwhile, drug can be rapidly released under the condition of low pH in atumor microenvironment, the tumor cell intake of a pharmaceutic preparation is further enhanced, and the quercetin drug-loading system based on the copper sulphide-metal organic frame material has low toxicity to normal cells, and is good in biological compatibility.

The invention discloses a preparation method and application of a mixed matrix membrane prepared by compositing a zeolite imidazolate framework material (ZIF hereafter represents the zeolite imidazolate framework material for the sake of narration) ZIF-7 with Matrimid polymide, and belongs to the technical field of membrane separation. The membrane is the mixed matrix membrane of ZIF-7 and Matrimid polymide (the chemical name is 5(6)-amino-1-(4'-aminophenyl)-1,3-trimethyl indene alkane, the trade name is Matrimid-5218, and Matrimid hereafter represents Matrimid polymide for the sake of narration), that is, the ZIF-7-Matrimide membrane and is used for separation of H2-CO2 mixed gas. The preparation method has the advantages that the preparation cost of ZIF-7 is lower than that of many MOF materials; the ZIF-7-Matrimid membrane combines the advantages of the zeolite imidazolate framework material ZIF-7 with the advantages of the polymer material Matrimid, and compared with a pure Matrimid membrane, the ZIF-7-Matrimid membrane has the advantages that the permeability is greatly improved, and the high selectivity is kept; the membrane shows the very good separation effect on the H2-CO2 mixed gas and has the huge application value in the fields of water gas hydrogen production.

The invention discloses zeolitic imidazolate frameworks (ZIFs) with an immobilized ionic liquid in cages and an application of the ZIFs. The ZIFs provided by the invention are composite materials formed by the ionic liquid and ZIFs. According to the ZIFs provided by the invention, the ionic liquid is introduced into the hollow cages of the ZIFs to change the cage diameter and the gas adsorption performance of the ZIFs, so that the ZIFs have wider application prospects in the fields of gas selective adsorption and molecular precision screening.

The present invention provides a method for preparing a metal-organic framework compound by using a Co-containing metal-organic framework compound (Metal-Organic Framework, the invention relates to acomposite material formed by loading one-dimensional rod-like Co3V2O8 on a porous carbon box (PCB) obtained by MOF pyrolysis, a preparation method of the composite material and an application of the composite material in a lithium ion battery negative electrode material. The preparation method disclosed by the invention comprises the following steps: preparing a zeolite imidazate skeleton-67 (Zeolitic Imidazolate Frameworks-67, ZIF-67) with a controllable morphology; the preparation method comprises the following steps: taking Co3V2O8 as a template precursor, carrying out high-temperature pyrolysis, carrying out acid pickling to remove Co, carrying out ultrasonic dispersion on the obtained porous carbon box in a solution, carrying out self-assembly by taking the porous carbon box as an internal skeleton through a hydrothermal process, and adhering Co3V2O8 to the surface of the porous carbon box and embedding Co3V2O8 into pores to form the composite material. The whole experiment process does not generate toxic and dangerous substances, the operation is simple and easy to implement, the Co3V2O8-coated PCB has a high specific surface area and a porous structure, the multiplying powerand the cycle performance of the lithium ion battery are effectively improved through the synergistic effect of the composite material, and the Co3V2O8-coated PCB is an excellent lithium ion batterynegative electrode material.

Provided herein are composites made up of carbon-enriched open frameworks, and mechanochemical methods of producing such composites. Such open frameworks may include metal-organic frameworks (MOFs), including for example zeolitic imidazolate frameworks (ZIFs). Such composites may be suitable for use as electrode materials, or more specifically for use in batteries.

The invention provides a method for improving the stability of MOFs. The method includes adopting a ligand exchange method to improve the stability of the MOFs, enabling the mole ratio formula to be ZIFs (zeolitic imidazolate frameworks):a imidazole derivatives:b alkaline adjuvants, wherein a is equal to 0.01-1,000, and b is equal to 0-1,000; adopting a central metal exchange method to improve the stability of the MOFs, enabling the mole ratio formula to be ZIFs:c metal salts, wherein c is equal to 0.01-1,000; when the metal and the ligand are exchanged, using hydrothermal or microwave heating for synthesis with the synthesis temperature to be 20 DEG C to 200 DEG C and the synthesis time to be 1-6,000 min; and washing and drying. The MOFs obtained through modification are provided with high adsorptive separation property and catalysis in a water system, and are good in synthesis repeatability.

The invention relates to a diaphragm material of a lithium-sulfur battery, in particular to a metal organic framework material and a preparation method thereof. The preparation method comprises the following steps of S1, preparing a ZIF-8 (zeolite imidazolate framework-8) nanopowder; S2, preparing ZIF8/CNT (carbon nanotube) composite fiber wires by electrostatic spinning; S3, carbonizing, so as toobtain the hollow porous ZIF8@CNTs; mixing the hollow porous ZIF8@CNTs, conductive carbon black and PVDF in a NMP solution, grinding, applying onto a clean diaphragm, and drying, so as to obtain themodified diaphragm of the lithium-sulfur battery. The diaphragm material has the advantages that the property of the diaphragm material is improved; the defects of obvious shuttle effect of polysulfides in the lithium-sulfur battery prepared by the prior art, obvious volume expansion effect of the lithium-sulfur battery, instability in the electrochemical property of the battery and the like are overcome; the production technology is simplified, and the production cost is reduced.

The invention discloses a modified ZIFs (Zeolitic Imidazolate Frameworks) material with a high CO2 adsorption property and a preparation method of the modified ZIFs material. According to the preparation method, in the process of synthesizing ZIF-8, large-size second ligand (1,n-bi(imidazole-1-yl) alkyl, and n=6, 8, 10) is introduced to ream ZIF-8, so that on one hand, diffusion constraint of narrow pores and channels of ZIF-8 to CO2 molecules is effectively improved, on the other hand, a stable framework structure and a large specific surface area of the ZIF-8 can be maintained, and the CO2 adsorption property can be remarkably improved. The adsorbent designed and synthesized by the invention is excellent in adsorption property, the adsorption amount of CO2 under normal pressure can be up to 7.3 mmol/g at most, the adsorption amount of the material is far greater than that (1.9 mmol/g) of pure ZIF-8, efficient adsorption can be maintained at both low-temperature regions and high-temperature regions, and the adsorption property is at a leading level of adsorbents reported at present.

The invention belongs to the technical field of a lithium-sulfur battery and particularly relates to an F-N-C composite material and a preparation method and an application thereof. The F-N-C composite material is a porous carbon material co-doped with fluorine atoms and nitrogen atoms, and the fluorine atoms and the nitrogen atoms are dispersed on the surface of and inside the porous carbon material; metal-organic framework material precursor is formed through reaction of soluble zinc salt with imidazolates, after calcination and fluorination treatment, the F-N-C composite material is obtained; the F-N-C composite material, conductive agent and binder are dispersed in organic solvent, ground and coated on a surface of a lithium sulfur battery diaphragm, namely, the lithium-sulfur batterymodified diaphragm. The method is advantaged in that the multiple types of atoms are utilized for co-doping, high electronegativity of nitrogen and fluorine is utilized, redistribution of charges in the adjacent atoms in the carbon material can be induced, electrochemical performance of a carbon material is improved, the method is for the lithium-sulfur battery modified diaphragm, and capacitanceand cycle stability of the lithium-sulfur battery can be improved.

The present invention provides a preparation method for zeolitic imidazolate frameworks. The preparation method comprises: adding a metal carbonate or oxide, an organic ligand to a hydrophilic liquid to obtain a mixture; introducing an acidic gas to reach a reaction pressure of 0.1 MPa to 2.0 MPa, and reacting for a predetermined time; heating to 30° C.-60° C. and vacuuming to obtain the zeolitic imidazolate framework. The present invention also provides a zeolitic imidazolate framework obtained by the above preparation method. The preparation method according to the present invention is environmentally friendly and has a high yield.

The invention discloses a preparation method of an electrode supporting zeolite imidazole diaphragm of a lithium ion battery. The porous diaphragm disclosed by the invention is prepared from Zeoliticimidazolate fraemwroks (ZIFs), wherein the Zeolitic imidazolate fraemwroks are Metal organic frameworks (MOFs) which are prepared from tetrahedral coordination configuration transition metal of cobalt, zinc, copper and the like, levomisole and derivative ligand coordination of the transition metal and the levomisole, and the ZIFs are a novel MOFs material. According to the preparation method disclosed by the invention, the prepared ZIF-67 is directly covered to the surface of an electrode material to form the electrode supporting diaphragm. Compared with a polyolefin diaphragm, the ZIF-67 diaphragm has good electrolyte wettability, high-temperature stability, higher discharge capacity and better cycling stability. The ZIF-67 is proved to have the potential of serving as a lithium ion battery diaphragm.

The invention discloses a method for confinement preparation of high-dispersion palladium sub-nanometer particles through zeolitic imidazolate frameworks (ZIFs). The method comprises the following technological steps that (1) metal nitrate and imidazole derivatives are ultrasonically dispersed in methyl alcohol, and then direct mixing, stirring, centrifugal separation, washing, ultrasonic dispersion and vacuum drying are conducted to obtain the ZIFs; (2) in ZIFs dispersion liquid, a pecursor solution of palladium chloride is added, and then decompression premixing, suction filtration, washingand vacuum drying are conducted to obtain Pd<2+>/ZIFs; and (3) in Pd<2+>/ZIFs dispersion liquid, decompression premixing is conducted, then a reduction agent, namely sodium borohydride, is added for reaction, and then suction filtration, washing and vacuum drying are conducted to prepare the ZIFs confinement loaded high-content and high-dispersion palladium sub-nanometer particles. The preparationmethod is simple, low in cost and environmentally friendly, and the prepared palladium sub-nanometer particles are even in size, good in dispersion and good in thermal stability, and can stably existin an organic solvent system and a water system.

The invention belongs to the technical field of environmental monitoring, and provides an immobilized enzyme method for improving the stability of horseradish peroxidase and application. At normal temperature and normal pressure, by using a co-precipitation method, a biological composite material of zeolite imidazolate skeleton-8/graphene immobilized natural horseradish peroxidase is synthesized in an aqueous phase. Embedding of the ZIF-8/GO composite material retains the excellent peroxidase catalytic activity of HRP, and meanwhile, the stability of the HRP is enhanced. Compared with a singleZIF-8 mineralized HRP material, the introduction of GO increases the tolerance of the HRP against complex environments such as high temperature, organic solvents and denaturants, and meanwhile, the storage stability and recycling capability of the HRP are enhanced. The peroxidase catalytic activity of the HRP@ZIF-8/GO biological composite material is regulated by utilizing DNA molecules; a non-marked colorimetric sensing method is established, and specific detection of kanamycin is realized.

The invention belongs to the technical field of zeolite-like imidazolate framework materials, and discloses a method for controlling the morphology of zeolite-like imidazolate framework material ZIF-8. The method includes the following steps: 1) mixing zinc nitrate hexahydrate, 2-methylimidazole, tetrabutylammonium bromide and a surfactant, and performing heating reaction to obtain a homogeneous solution; and 2) mixing the homogeneous solution and water to obtain a turbid liquid; and then performing centrifugation, washing and drying so that a zeolite-like imidazolate framework material can beobtained, wherein the surfactant is at least one among a poly(ethylene oxide)-polypropylene oxide-poly(ethylene oxide) triblock copolymer, polyvinylpyrrolidone K30, sodium dodecyl sulfate and hexadecyl trimethyl ammonium bromide, and the morphology of the material is different when the surfactant is different. The method is simple, mild and fast in condition, low in comprehensive cost and pollution-free to environment; and the method can synthetize the material with different morphologies by selecting different surfactants, such as hollow balls, solid balls, multistage porous particles and stacked particles.

The invention belongs to the technical field of metal organic framework materials, and discloses a zeolite-like imidazolate framework material and a preparation method thereof. The method is as follows: (1) mixing metal salts, imidazole derivatives and quaternary ammonium salts, heating and reacting to obtain a homogeneous solution; (2) adding water to the homogeneous solution after cooling to obtain a suspension; (3) The suspension is centrifuged, washed and dried to obtain the zeolite-like imidazolate skeleton material. The method of the invention has the advantages of simple operation, mild conditions, fast speed, no need of solvent, relatively low overall cost and no environmental pollution. The prepared zeolite-like imidazolate framework material has the characteristics of high crystallinity, large specific surface area, good thermal stability, etc., and has good application prospects.

A method is provided for replacing at least a portion of the organic linker content of a zeolitic imidazolate framework composition. The method comprises exchanging the organic linker with another organic linker. Also provided is a new material, designated as EMM-19, and a method of using EMM-19 to adsorb gases, such as carbon dioxide.

The invention discloses a preparation method for MOF crystal form transformation. The preparation method comprises the following steps: dissolving organic ligand 2-methylimidazole (HIm) by adopting amixed solvent of ionic liquid and water, and mixing with a Zn inorganic salt aqueous solution to realize structural transformation from 2D MOF to 3D MOF, wherein the ionic liquid is a hydrophilic functional solvent composed of imidazole cations, the 2D MOF is two-dimensional zeolite imidazole ester (ZIF-L), and the converted 3D MOF is three-dimensional zeolite imidazole ester (ZIF-8). The preparation method disclosed by the invention not only can realize conversion of an MOF skeleton structure, but also can accelerate nucleation and crystallization of MOF and regulate and control product morphology, and is an environment-friendly method for preparing zeolite imidazolate MOFs with different structures and morphologies.

The invention discloses a series of substituted carbazole-imidazolate or benzimidazolium salt compounds with a general structure represented by formula I or II, and a preparation method thereof. According to the preparation method, carbazole is taken as a raw material, and the target compound is obtained via five steps including N-methylation, acylation, reduction, combination with imidazole, and salifying. It is shown by results of in vitro antitumor activity cytotoxicity test that the substituted carbazole-imidazolate or benzimidazolium salt compounds possess excellent cytotoxic activity.