149 results about "Solvothermal synthesis" patented technology

The present invention discloses a layered metal hydroxide composite catalytic material, its preparation method and application. The composite catalytic material comprises a carrier carbon nanotube and a metal hydroxide loaded on the carbon nanotube, and the metal is iron, cobalt and nickel. Preparation method: (1) Dissolve nickel salt, cobalt salt, iron salt and urea in an alcohol solution, stir evenly, then add carbon nanotubes, and continue to stir evenly to obtain a mixed solution; (2) Carry out a solvothermal synthesis reaction on the mixed solution obtained in step (1), filter, wash and dry after the reaction is completed to obtain the layered metal hydroxide composite catalytic material. The carbon nanotubes are introduced into the layered metal hydroxide in this composite catalytic material, reducing the precipitation of metal ions, avoiding the aggregation of hydroxides, improving the stability and catalytic activity of the catalytic material, and being used for activating persulfate to degrade organic pollutants, realizing the efficient activation of persulfate so as to improve the degradation rate of pollutants.

The present invention provides a manganese metal-organic framework material with oxidase properties, a preparation method, and an application thereof. The material is prepared by the following method: using 1,3,5-trimethic acid as an organic ligand, manganese acetate tetrahydrate as a manganese source, and a water-ethanol solution as a solvent, to obtain a manganese metal organic framework (MOF) precursor via a solvothermal synthesis technique; the manganese MOF precursor is post-synthetically modified using an oxidant, wherein the oxidant is a mixed solution of an aqueous alkali metal hydroxide solution and H2O2, and the ratio of the manganese MOF precursor to the alkali metal hydroxide is (400-600) mg:(0.5-2) mmol. By using specific types and amounts of manganese MOF precursors and oxidants, the resulting metal-organic framework nanomaterial has specific enzyme-like properties, can exert the function of uricase, and has optimal and high uricase activity under neutral pH conditions.

The invention discloses a preparation method and application of a molybdenum monatomic photocatalyst for producing ammonia through nitrogen reduction, and belongs to the technical field of photocatalytic material preparation. According to the preparation method, molybdenum hexacarbonyl is taken as a metal precursor, and molybdenum single atoms are introduced into a covalent organic framework material sp2c-COF by adopting a solvothermal synthesis method, so that the covalent organic framework photocatalyst is obtained; according to the covalent organic framework photocatalyst, molybdenum single atoms are anchored, the local coordination environment of a covalent organic framework is finely controlled, the unique electronic structure and catalytic activity of the molybdenum single atoms can effectively optimize electron cloud distribution of COFs, the adsorption and activation capacity on nitrogen molecules is enhanced, and the covalent organic framework photocatalyst has the advantages that the covalent organic framework photocatalyst is high in catalytic activity and high in catalytic activity; the covalent organic framework photocatalyst can effectively inhibit the compounding of photo-induced electron-hole pairs so as to prolong the service life of photo-induced electrons, so that the covalent organic framework photocatalyst has excellent ammonia production performance, and the ammonia production activity can reach 372.6 [mu] mol.g <-1 >. H <-1 > under the conditions of visible light and pure water.

The invention belongs to the technical field of catalytic materials, and particularly relates to high-entropy alloy nanoparticles used as a biocatalyst and application of the high-entropy alloy nanoparticles. The PtFeCuCoNi high-entropy alloy nano-particles with pH adaptability are developed through a one-step solvothermal synthesis method, it is found that the PtFeCuCoNi high-entropy alloy nano-particles can serve as potent oxidase, can generate reactive oxygen species (ROS) and effectively kill bacteria such as MRSA under the acidic condition, and can play the functions of superoxide dismutase and catalase under the neutral condition, so that the PtFeCuCoNi high-entropy alloy nano-particles with the pH adaptability can be used for effectively killing bacteria such as MRSA. Active oxygen in cells is efficiently removed, oxidative stress is relieved, and the cell protection effect is achieved.

The invention belongs to the field of CO2 adsorbent synthesis, and particularly relates to a CO2 adsorbent synthesis method and system for packaging MOFs based on a microfluidic technology. An MOFs precursor solution is packaged in a photocuring modified PDMS polymer shell by adopting a micro-fluidic technology to be directly subjected to in-situ thermal reaction to synthesize an MOF material instead of traditional water / solvent thermal synthesis of MOFs, a closed micro-scale reaction environment is provided for synthesis of MOFs by a micron-sized capsule prepared by adopting the micro-fluidic technology, the synthesis efficiency of the MOFs is improved, the internal MOFs are protected, and the preparation method is simple and convenient to operate. The MOF-based carbon adsorbent has the advantages that the MOF-based carbon adsorbent is added into the MOF-based carbon adsorbent, so that the influence of an external complex water vapor environment on the MOFs is relieved, the problems of poor operation stability, high stacking air resistance, large forming performance loss and the like of the MOF-based carbon adsorbent are solved, high-performance, low-energy-consumption and modular operation CO2 capture is realized, and the requirement on the carbon adsorbent in a zero-carbon emission process is met.

The invention relates to the technical field of photocatalysis, in particular to a terbium and cerium doped MIL-177 confinement multi-metal cluster photocatalyst, which is prepared from terbium / cerium double metal elements, an MIL-177 metal organic framework, a multi-tungsten phosphomolybdate nanocluster and L-cysteine, according to the photocatalyst, an MIL-177 metal organic framework modified by terbium / cerium double metal elements is used as a substrate, a multi-tungsten phosphomolybdate nanocluster is used as an active center, microwave hydrothermal synthesis and solvothermal synthesis are performed, and L-cysteine surface modification is performed. Double metal elements terbium and cerium doped aluminum-based metal organic frameworks are combined with multi-tungsten phosphomolybdate nanoclusters, and surface modification is performed through L-cysteine, so that the visible light absorption range is widened, efficient separation of photo-generated charges is realized, catalytic active sites are increased, and the efficiency and selectivity of photocatalytic reduction of carbon dioxide are improved.

The invention discloses a silicon-carbon composite negative electrode material with silicon coated by porous carbon as well as a preparation method and application of the silicon-carbon composite negative electrode material, silicon nanoparticles (50-100nm) are taken as a core and are uniformly coated by a porous carbon layer derived from a zeolite imidazate framework material to form a core-shell structure (Si-C), and a silicon / carbon dual-phase coexisting composite material is constructed. The material is further doped with Ni, Co or Zn elements in situ, so that the conductivity and the catalytic activity are improved. The preparation method comprises the following steps: (1) carrying out solvothermal synthesis on a Ni / Co / Zn-ZIF precursor; (2) mixing the silicon nanoparticles with a ZIF precursor, and performing gradient carbonization (350-800 / 900 DEG C) to form a carbon-coated silicon structure; and (3) compounding with a conductive agent and a binder to prepare the negative pole piece. The silicon-carbon composite material disclosed by the invention has high silicon loading capacity (40-60wt%), and the first-circle discharge capacity reaches 1650mAh / g. The material is suitable for high-energy-density lithium ion batteries, and has the advantages of simple process, low cost and large-scale production.

The invention relates to a monovalent selective cation exchange membrane and a preparation method thereof, and belongs to the technical field of cation exchange membranes, and the specific steps are as follows: weighing DA and ammonium persulfate, adding into a buffer solution to obtain a PDA coating solution, pouring the PDA coating solution on the surface of a base membrane for soaking, and depositing a PDA coating on the surface of the activated base membrane to obtain a membrane I; the preparation method comprises the following steps: dissolving zirconium tetrachloride and 2-aminoterephthalic acid in DMF (Dimethyl Formamide), performing solvothermal synthesis on amino-functionalized MOF (UIO-66-NH2) under an acidic condition, weighing PEI and MOF (UIO-66-NH2) powder, adding into a buffer solution, pouring on the surface of a membrane I, depositing a PEI-MOF composite coating to obtain a membrane II, and air-drying the membrane II to obtain the monovalent selective cation exchange membrane. Therefore, the monovalent selective cation exchange membrane which is low in cost, high in selectivity and stable in performance can be prepared by modifying the cation exchange membrane through a simple and easy-to-operate method.

The invention relates to a silver nanowire preparation technology, and aims to provide a method for preparing a high-length-diameter-ratio silver nanowire in one step through a solvothermal synthesis reaction. Comprising the following steps: mixing and stirring silver ions and a PVP (Polyvinyl Pyrrolidone) solution, continuously adding bromide ions and chloride ions serving as a nucleating agent, and mixing and stirring to obtain a reaction solution; transferring the reaction solution into a hydrothermal reaction kettle, and reacting under a heating condition to obtain a silver nanowire mother solution; and sediments in the silver nanowire mother liquor are separated and cleaned, and the silver nanowires with the length-diameter ratio being 2148-3190 are obtained. By means of a cooperative regulation mechanism of bromide ions, chloride ions and polyvinylpyrrolidone, the problem that in existing research work, the length and the diameter of the silver nanowire are difficult to consider at the same time is solved, and it is ensured that the length of the silver nanowire is maintained while the diameter of the silver nanowire is reduced; the technological process is simplified, and the problems of nitrogen atmosphere reaction, secondary heating and the like in the prior art are solved; and by optimizing all reaction parameters, stable and controllable preparation of the silver nanowire with the high length-diameter ratio is finally achieved.

The invention relates to the technical field of photocatalysis and nano materials, in particular to ZnO / CuO multistage microspheres with atomic-scale heterogeneous interfaces and oxygen vacancies as well as a preparation method and application of the ZnO / CuO multistage microspheres. The preparation method comprises the following steps: jointly dissolving soluble zinc salt, soluble copper salt and 1, 3, 5-benzene tricarboxylic acid in a composite solvent composed of glycerol and absolute ethyl alcohol, and carrying out solvothermal synthesis reaction to obtain Zn / Cu-MOFs multistage microspheres; the Zn / Cu-MOFs multistage microspheres are used as a precursor, and the ZnO / CuO multistage microspheres with atomic-scale heterogeneous interfaces and oxygen vacancies are obtained through calcination treatment. According to the preparation method disclosed by the invention, a solvothermal method is combined with a calcining process, so that uniform compounding and tight combination of ZnO and CuO are realized, the oxygen vacancy concentration of the ZnO / CuO multistage microspheres with atomic-scale heterogeneous interfaces and oxygen vacancies is effectively regulated and controlled, and a novel functional material which is high in performance and easy to prepare is provided for the field of photocatalysis.

In some aspects, the present disclosure provides a lithium metal battery having a negative electrode that comprises a substantially pure lithium metal and a positive electrode that comprises the epsilon polymorph of vanadyl phosphate (ɛ-VOPO4). The lithium metal can have less than five ppm of non-metallic elements by mass. The ɛ-VOPO4 can be made from solvothermally synthesized H2VOPO4, and be optimized to reversibly intercalate two Li-ions to reach full theoretical capacity with a coulombic efficiency of 98%. This material can adopt a stable 3D tunnel structure and can extract two Li-ions per vanadium ion, giving a theoretical capacity of 305 mAh / g, with an upper charge / discharge plateau at around 4.0 V, and one lower at around 2.5 V. The ε-VOPO4 particles may be modified with niobium (Nb) to improve the cycling stability.

The invention discloses a method for adsorbing and separating high-purity gas, which belongs to the technical field of chemical separation and comprises the following steps of: separating and purifying mixed gas or isotope by using an adsorption separation medium; the adsorption separation medium is a microporous metal organic framework material which is thermally synthesized from divalent metal salt and a ligand 1, 5-dihydrobenzo [1, 2-d: 4, 5-d '] bis ([1, 2, 3] triazole) through a solvent. The microporous metal organic framework material has a uniformly distributed microporous structure, a high specific surface area and excellent thermal stability and chemical stability, and high-selectivity separation of rare gas xenon / krypton, methane / propane / ethane, propylene / ethylene, ethane / ethylene and xenon isotopes can be realized through pressure swing / temperature swing adsorption; the adsorbent has ultrahigh adsorption and storage capacity for xenon, propane, propylene and ethane, and high-purity (greater than or equal to 99.99%) xenon, krypton, methane, ethylene and ethane and high-purity isotopes of 129Xe and 131Xe can be obtained after separation.

The application belongs to the technical field of photocatalytic material preparation, and provides a novel PtCu 20 / hcp-UiO composite material and a preparation method and application thereof. The PtCu CuPSs / hcp-UiO composite material is synthesized by a solvothermal method, contains a Cu photosensitizer ligand L x , and is synthesized by solvothermal synthesis of hcp-UiO with different photosensitizer contents. The reaction temperature is 120-150 DEG C, heating is completed in a high-temperature and high-pressure reaction kettle for 24 hours, and a Cu x / hcp-UiO photocatalyst is obtained. Pt monatomic atoms are anchored on Cu x / hcp-UiO by an impregnation method by using N on a pyridine ring on the ligand, a series of catalysts are obtained, and Cu x / hcp-UiO, CoCu x / hcp-UiO, NiCu x / hcp-UiO, FeCu x / hcp-UiO) are anchored on Cu, Co, Ni and Fe monatomic atom catalysts by the same method. The PtCu 20 / hcp-UiO composite material synthesized by a two-step solvothermal one-step impregnation method has excellent photocatalytic activity and stability, can realize efficient photocatalytic hydrogen production, the preparation method is simple in operation, low in cost, friendly to the environment, has no harsh operation environment requirements, and is conducive to large-scale promotion.

The application discloses a supercritical hydrothermal and solvothermal synthesis nanometer composite zirconia system and quality control method, belongs to the technical field of energy chemical industry, and sets material composite deployment and delivery unit, heat reuse unit, reaction post-processing unit and additional product recovery unit to constitute the whole preparation system. The supercritical hydrothermal and solvothermal synthesis nanometer composite zirconia system integrates energy reuse, additional product recovery and quality control and the like into one, can realize heat energy efficient utilization, additional product recovery and quality efficient control system, can realize energy level matching in the heat energy utilization process, can realize resource utilization in the post-processing link, can realize nanometer zirconia particle size control, purity control, crystal form stability and anti-agglomeration in the whole system operation, improves system thermal efficiency, reduces operation cost, saves energy, and simultaneously obtains high-quality nanometer zirconia particles, and lays a foundation for the industrialization process of continuous supercritical hydrothermal / solvothermal synthesis.

The invention discloses a process for preparing a V2O3 / ZnV2O3 total battery by simultaneously using vanadium oxide in a zinc ion battery as a positive electrode material and a negative electrode material, which comprises the following steps: reacting ammonium metavanadate with absolute ethyl alcohol by adopting a solvothermal synthesis method, washing, drying, and calcining in a tubular furnace to obtain V2O3; in the preparation process of the V2O3 positive electrode material, only V2O3, acetylene black serving as a conductive agent and PVDF serving as a binder are mixed in proportion and then are coated on graphite paper, other coating protection materials do not need to be introduced into a V2O3 / Zn negative electrode, and V2O3 is used as a protection layer to inhibit growth of zinc dendrites, relieve hydrogen evolution side reaction of the zinc negative electrode and reduce corrosion of zinc. Vanadium oxide V2O3 is directly used as a core positive electrode material, the zinc negative electrode coating is developed by utilizing the characteristics of the vanadium oxide V2O3, a material is formed, meanwhile, the performance optimization of the positive electrode and the negative electrode is realized, the used raw materials are simple and easy to obtain, the process is simple and easy to implement, and the preparation process is simple and easy to implement from V2O3 raw material synthesis to positive and negative electrode piece preparation to V2O3 / ZnV2O3 total battery assembly. And comprehensive improvement of positive and negative electrode performances of zinc ions is simultaneously realized by a single material.

In the production of an MOF membrane complex, seed crystals of a CAU-10 MOF are deposited on a support, an Al source solution that is an aqueous solution containing an Al ion source is prepared, and a ligand solution is prepared in which an organic ligand used for synthesis of the CAU-10 MOS dissolves in a solvent. Then, a starting material solution is prepared by mixing the Al source solution and the ligand solution at a rate that does not cause the starting material solution to become cloudy. The support is immersed in the starting material solution to form an MOF membrane that is the CAU-10 MOF on the support by Solvothermal synthesis.

The invention belongs to the technical field of acoustic catalysis composite materials, and particularly relates to a molybdenum disulfide / zirconium dioxide composite acoustic catalyst and a preparation method and application thereof. According to the preparation method disclosed by the invention, through a two-step method, zirconium dioxide is firstly prepared, and then MoS2 / ZrO2 is synthesized through a solvothermal synthesis method. According to the method, the influence on the ofloxacin degradation effect is researched from factors such as different compound proportions and addition amounts of MoS2 / ZrO2, the initial concentration and pH value of an ofloxacin solution, ultrasonic time and the like, the feasibility of the technology is comprehensively verified, and the degradation rate of the finally synthesized MoS2 / ZrO2 catalyst on ofloxacin under the ultrasonic condition can reach 80% or above.

This invention discloses a method for preparing interface-reinforced niobium pentoxide / porous graphene and its energy storage application. The method involves adding porous graphene oxide during the solvothermal synthesis of a niobium pentoxide precursor to obtain a composite precursor of niobium pentoxide and porous graphene oxide. This precursor is then annealed under a protective atmosphere to obtain the interface-reinforced niobium pentoxide / porous graphene composite material. The composite material obtained by this invention exhibits excellent performance as an electrochemical energy storage material. Furthermore, the preparation method of this invention is simple to operate, requires no complex equipment, and is easily controlled, making it suitable for mass production.

The invention provides a preparation method and application of a cucurbit [6] uril-based supramolecular fluorescent probe material. The fluorescent probe material is experimented in a reaction kettle by adopting a solvothermal synthesis method, and a novel supramolecular assembly fluorescent probe is successfully prepared by taking cucurbit [6] uril (CB [6]) as a main body and 3-amino isonicotinic acid as a structure inducer. The invention has the advantages of simple synthesis method, cheap raw materials, high detection sensitivity, strong anti-interference capability, fast response speed and the like. The supramolecular assembly is of great significance for monitoring water pollution.

The invention discloses a Fe / Ce bimetal-based organic framework and a preparation method and application thereof.The Fe / Ce bimetal-based organic framework is obtained through an acid-base neutralization reaction of a Ce-based metal organic framework material and alkaline ferric hydroxide, and the preparation method specifically comprises the following steps that 1, Ce (NO3) 2.6 H2O solution and a 1, 3, 5-benzene tricarboxylic acid solution are mixed and subjected to a stirring reaction, synthesis is conducted through a solvothermal synthesis method, and the Fe / Ce bimetal-based organic framework is obtained; washing the precipitate obtained by the reaction, and drying in vacuum to obtain the Ce-based metal organic framework material (Ce-MOFs); and (2) Ce-MOFs and Fe (OH) 3 are subjected to in-situ acid-base neutralization, Fe enters an uncoordinated carboxyl skeleton, and Fe / Ce bimetallic doping is achieved. The preparation method is simple and easy to operate, and the prepared bimetal-based organic framework has a cluster overlapping structure, is large in specific surface area, shows sensitive detection characteristics on aflatoxin, and can be used as an electrode modification material to quickly, sensitively and accurately detect low-concentration aflatoxin in a detection environment and a food sample.

The invention discloses an iron-based composite material catalyst capable of being used for low-temperature methane oxidation and a preparation method and application thereof, and the preparation method comprises the following steps: in an organic solvent, carrying out solvothermal synthesis on silicotungstic acid hydrate and ferric nitrate to obtain an Fe-SiW precursor; and the Fe-SiW precursor Fe3O4-WO3 composite material is processed through a hydrogen program. The preparation method is simple, the raw materials are cheap, easy to obtain, green and pollution-free, the synthesized material has relatively strong stability, no subsequent treatment is needed, the stability in water is extremely high, and the structure is kept unchanged when the material is soaked in water for a long time. The catalyst disclosed by the invention can be used for catalyzing methane to directly oxidize at lower temperature and lower H2O2 concentration to prepare C1 products such as methanol and the like.

This invention discloses a hydrazone-linked fluorine-substituted covalent organic framework material, its preparation method, and its applications, belonging to the field of semiconductor photocatalysis technology. The material is synthesized by hydrazone condensation of 1,3,5-trifluoro-2,4,6-tris(4-formylphenyl)benzene and terephthalohydrazide, denoted as F-TPDH-COF. A one-step solvothermal synthesis is employed, resulting in a mild, environmentally friendly, low-cost, and easily scalable process. The material obtained by this invention utilizes hydrazone bonds to achieve proton enrichment in acidic media, and fluorine atoms regulate the electronic structure to improve charge separation efficiency. Under pH=2 conditions, the photocatalytic hydrogen peroxide production rate reaches as high as 5825.2 μmolg. ‑1 h ‑1 Its activity and stability are significantly better than most existing COF photocatalytic materials, and it can be used for efficient photocatalytic preparation of hydrogen peroxide in acidic systems, showing good prospects for industrialization.

The application provides a kind of copper sulfide@nickel disulfide positive electrode material based on two-dimensional nanosheet wrapping three-dimensional cube and its preparation method and lithium-magnesium dual-ion battery, first using copper salt, alkaline solution and D (+) -glucose in the water bath condition of 70 DEG C, directional formation Cu2O cube.And then, Cu2O and nickel source, sulfur source and surfactant are synthesized by solvothermal synthesis, forming the structure of two-dimensional and three-dimensional combination of NiS2 nanosheet wrapping Cu2S cube.The two-dimensional and three-dimensional combination structure can shorten the particle transmission path, achieve the effect of fast charging and discharging, at the same time, provide more active sites, increase the specific surface area, fully contact with electrolyte, improve the cycle stability of battery.

The invention relates to a preparation method of a Co-based MOF material constructed based on H3BTTC. The preparation method comprises the following steps: adding a ligand and a metal salt into N, N-dimethylacetamide through a conventional solvothermal synthesis method, adding a tetrafluoroboric acid aqueous solution to adjust the pH value and polarity of the solution, heating and crystallizing in a drying oven, washing a product with a solvent for multiple times, and carrying out vacuum drying to obtain a target material. The method can accurately regulate and control pore channels, conditions are mild and efficient, the performance of the material in the fields of gas adsorption and separation, catalysis, sensing and the like is effectively improved, and the remarkable advantages are enhanced.

The invention relates to the technical field of magnetic materials, and discloses a binuclear dysprosium single-molecular magnet and a preparation method thereof. The high-yield [Dy2L2 (MeOH) 2 (NO3) 2)]. 3MeOH is prepared by adopting a room-temperature volatilization method, and compared with methods such as high-temperature and high-pressure solvothermal synthesis and poor solvent diffusion, the method has the advantages of simple reaction conditions, easiness in operation, convenience and the like. The crystal structure of the binuclear dysprosium single-molecule magnet material is a triclinic system, the space group is P-1, and the cell parameters are as follows: # imgabs0 # imgabs1 #, alpha is equal to 109.4020 (10) degrees, beta is equal to 93.1900 (10) degrees, and gamma is equal to 98.2070 (10) degrees; the binuclear dysprosium single-molecule magnet synthesized by the method can show typical slow relaxation behavior in a zero field, has the characteristics of a single-molecule magnet, and can be applied to the fields of quantum calculation and ultrahigh-density information storage.

The present invention belongs to the technical field of synthesis and preparation of negative electrode materials for lithium-ion batteries, and specifically discloses a preparation method and application of a nitrogen-carbon porous material based on bimetallic ZIFs, comprising the following steps: S1, dissolving zinc nitrate hexahydrate, cobalt nitrate hexahydrate, and an organic ligand in a DMF solution in molar ratio, stirring evenly to obtain a reaction solution, generating a solid product by a solvent thermal synthesis method, and obtaining a bimetallic zeolite imidazolate framework powder material through centrifugation, washing, and drying; S2, pyrolysis and carbonization treatment of the bimetallic zeolite imidazolate framework powder material obtained in S1 under an inert atmosphere, cooling, soaking in a dilute hydrochloric acid solution, filtering, washing with water until neutral, and drying to obtain a nitrogen-carbon porous material. The present invention uses the prepared nitrogen-carbon porous material based on bimetallic ZIFs as a negative electrode material for lithium-ion batteries. The negative electrode material has high specific capacity, excellent cycle stability, and good rate performance, and shows good application prospects in the field of lithium-ion batteries.

This invention discloses a system and control method for supercritical hydrothermal and solvothermal synthesis of nano-zirconia, including a material conveying system, a mixing reaction unit, a post-processing unit, and an emergency tank unit. The entire system can achieve quality control, precise temperature and pressure control, large flow rate system control, and safety control in supercritical hydrothermal / solvothermal synthesis of nano-composite zirconia. It solves key problems such as rapid heating and pressurization and cooling and depressurization, safe and reliable operation, and quality control in supercritical hydrothermal / solvothermal synthesis of nano-composite zirconia systems, and achieves system optimization, laying the foundation for the industrialization of continuous supercritical hydrothermal / solvothermal synthesis.

A biphenylthiourea carboxylic acid metal organic framework crystal material and a preparation method and application thereof.The material has the following chemical formula: {[Zn4O(L)3]·DMF·H2O} n , wherein L is a 6-thio-6,7-dihydro-5H-dibenzo[d,f][1,3]diazepine-3,9-dicarboxylate divalent anion, and n is a degree of polymerization.The metal organic framework crystal material of the present application is synthesized by a solvothermal method, is simple to operate, has low cost, high yield, and is easy to mass industrial production.The prepared metal organic framework crystal material has a high specific surface area (a BET specific surface area of 594 m 2 / g), and an adsorption amount of CO2 of 46.0 cm 3 / g at 1 atm and 273 K.The biphenylthiourea carboxylic acid metal organic framework crystal material of the present application can efficiently catalyze a Friedel-Crafts alkylation reaction of substituted indole and substituted trans-nitrostyrene to generate an indole 3-substituted derivative, and can also efficiently catalyze a Michael addition reaction of diethyl malonate and substituted trans-nitrostyrene, both of which have mild conditions, and the catalyst can be recycled with almost no activity loss, and are good heterogeneous catalysts.

This invention provides a porous transparent Ga2O3 nanoceramic material and its preparation method. 0.5 g of Ga(NO3)3·9H2O was poured into 15 ml of anhydrous ethanol and stirred until a clear precursor solution was formed. This solution was then transferred to a polytetrafluoroethylene (PTFE) liner, and a solvothermal synthesis reactor was assembled and placed in a constant-temperature drying oven at 180 °C for 15 h. After the reaction, the reactor liner was opened, revealing a gel-like product. This product was washed three times with anhydrous ethanol by centrifugation, resulting in a white gel-like product. It was then dried in a constant-temperature drying oven at 80 °C for 10 h. The dried precursor was then placed in a muffle furnace and calcined at 500 °C for 5 h. The resulting ceramic material exhibited a maximum transparency of 79.64%. This invention yields a porous, transparent Ga2O3 nanoceramic material under normal pressure. The material is sintered from γ-Ga2O3 nanoparticles, exhibiting an irregular, near-spherical morphology with an average particle size of 5.86 nm. The nanoparticles form a nanoporous structure with pore diameters ranging from approximately 2 to 20 nm, showing a significant peak at 4.74 nm. The specific surface area is 159.3 m². 2 / g.

The present application belongs to the technical field of fuel cell science and technology, and particularly relates to an oxygen reduction catalyst of carbon nanotube / covalent organic framework compound coupled polyaniline conductive polymer and a preparation method and application thereof. The present application takes thionine and 1,3,5-tri(p-formylphenyl)benzene as raw materials, prepares a covalent organic framework compound through a solvothermal synthesis method, combines the covalent organic framework compound with carbon nanotubes, and uses an in-situ chemical oxidation polymerization method to prepare a polyaniline-coated carbon nanotube / covalent organic framework compound material, so as to form a carbon nanotube / covalent organic framework compound coupled polyaniline conductive polymer functional material modified fuel cell cathode which has high conductivity and porosity. The method of the present application has low cost and strong operability. The prepared oxygen reduction catalyst has superior oxygen reduction catalytic performance, exhibits good electrochemical activity and stability, and can be used as a fuel cell cathode catalyst to improve the electrochemical performance in actual application.