499 results about "Solvothermal synthesis" patented technology

The invention relates to a hydrogen storage material, in particular to a load porous metal organic hydrogen storage material, being a load metal-porous metal organic compound composite material. The hydrogen storage material is made according to the following steps: (1) inorganic salt and organic acid are used as reagents, water or an organic solvent is adopted, a porous metal organic compound is prepared by a hydro-thermal synthesis method or a solvent-thermal synthesis method; (2) the porous material is loaded by soluble metal salt; the load metal-porous metal organic compound composite material is made by adopting a liquid phase method or a hydrogen reducing method; the loading amount of the metal is 2 to 20 percent of the mass of the composite material. The hydrogen storage material has simple preparation process and low cost; the chemical modification of the organic frame material of the porous metal can effectively improve the hydrogen absorbing and releasing performance of the material under a moderate condition, thereby providing a novel hydrogen storage material which realizes good hydrogen absorbing and releasing under the moderate condition.

The invention relates to a solvent thermal synthesis method of an SAPO (silicoaluminophosphate) molecular sieve and a catalyst prepared by the SAPO molecular sieve. The solvent thermal synthesis method provided by the invention is characterized in that organic amine is directly used as a solvent and a template agent of a synthesis system, and the SAPO molecular sieve is prepared through solvent thermal synthesis.

The invention discloses a slice-shaped nanometer SAPO-34 molecular sieve with relatively low silicon content, a preparation method and an application thereof, and belongs to the technical field of molecular sieves. Tetraethylammonium hydroxide is used as a template, the slice-shaped nanometer SAPO-34 molecular sieve with relatively low silicon content is synthesized by using the traditional hydrothermal method or a solvothermal synthesis method. The synthesized nanometer SAPO-34 sample is a slice-shaped feature, of which the average crystal granularity size is 50-250nm and the thickness is 50-100nm. The synthetic method is simple and efficient; the solvent consumption is low; the yield of the synthesized nanometer SAPO-34 sample is extremely high and can be up to 85-90 percent; the synthesized nanometer SAPO-34 sample is high in low carbon olefin selectivity during reaction of methanol to olefin (MTO), particularly, the total yield of ethylene and propylene can be up to more than 83 percent, and the molecular sieve is very suitable for industrial amplification application.

The invention provides a synthetic method of a metal organic skeleton membrane. Firstly, metal salt A is added to a solvent A, so as to be mixed and dispersed, then a stabilizing agent is added to mix and react, so as to obtain metal-sol, a substrate is immersed in the metal-sol for soaking or ultrasonic shaking for 5 to 60 min, and then the substrate is taken out and dried for 2 to 4 h at 60 to 180 DEG C, so as to obtain the substrate containing the metal-sol; then organic ligands, metal salt B and a solvent B are mixed and uniformly stirred, so as to obtain a synthetic solution; subsequently, the substrate containing the metal-sol is immersed in the synthetic solution for solvothermal synthesis, and a synthetic membrane is taken out, flushed and dried after a reaction system is cooled, so as to obtain the metal organic skeleton membrane. According to the synthetic method, the continuous dense metal organic skeleton membrane can be obtained, and metal organic skeleton materials are synthesized in a duct, so as to increase the rigidity and compressive strength of the membrane; the synthetic method is suitable for substrates of various materials and configurations and has the advantage of wide application prospect.

The invention relates to the technical field of preparation of environment functional materials, in particular to a magnetic composite material surface imprinting thermosensitive adsorbent, and a preparation method and the application thereof. The method comprises the following steps that: firstly, a ferroferric oxide / nerchinskite nanotube magnetic composite material is prepared by a solvent thermal synthesis method; secondly, the magnetic composite material is modified on ethenyl by using 3-(methacrylo) propyltrimethoxyl silane; and finally, the nerchinskite nanotube magnetic composite material is prepared by using the ethenyl-modified magnetic composite material as a substrate material, 2, 4, 5-trichlorophenol as a template molecule, methacrylate as a functional monomer, N-isopropylacrylamide as a thermosensitive functional monomer, ethylene glycol dimethacrylate as a cross-linking agent, and 2,2'-azodiisobutyronitrile as an initiator. The prepared thermosensitive imprinting adsorbent is obvious in thermal stability and magnetic stability, sensitive in magnetic effect and thermosensitive effect, relatively high in adsorption capacity, obvious in reversible absorption / release function along with temperature and obvious in tertiary calcium phosphate (TCP) molecule recognition performance.

The invention discloses a graphene / inorganic semiconductor composite film and a preparation method thereof. The preparation method includes using graphene oxide or reducing graphene and inorganic semiconductor precursor as major raw materials, using a sol-gel method method or hydrothermal / solvent thermosynthesis method, using a function group on the surface of graphene as a nucleating point, and using the nucleating point to control size, shape and crystallization performance of an inorganic semiconductor to prepare an even composite film. Hydrogen bond, ion bond or covalent bond is formed by the prepared composite film using the function group on the surface of graphene with the inorganic semiconductor, dispersibility between graphene sheets is increased by the inorganic semiconductor, surface defects of graphene are compensated, conductivity and uniformity of graphene are increased, interface geometric contact and energy level matching of graphene and semiconductor nano-particles are improved, application range of a device is enlarged, and the graphene / inorganic semiconductor composite film is suitable for photoelectric fields of solar cells, sensors, OLEDs (organic light emitting diodes), touch screens and the like.

The invention discloses a preparation method and application of a ZnIn2S4-graphene composited photochemical catalyst. The preparation method comprises the following steps of: placing graphite oxide into a reducibility alcohol agent for ultrasonic dispersion; adding zinc sulfate and indium chloride into the reducibility alcohol agent, stirring and dissolving; adding thioacetamide into two systems after the two systems are mixed; transferring the mixed systems into a hydrothermal kettle for a reaction; and after the reaction is finished, carrying out vacuum filtration on the obtained product, washing, vacuumizing and grinding to obtain a nano ZnIn2S4-graphene composited photochemical catalyst. In the invention, grapheme is taken as a supporting material, and a solvothermal synthesis method is adopted to further prepare the nano ZnIn2S4-graphene composited photochemical catalyst. The catalyst prepared by using the method in the invention has the advantages of wide visible light responding range and high photocatalysis activity, can be used for transformation and use of solar energy and comprehensive ecological improvement, such as air purification, sewage disposal, hydrogen production through photodegradation, preparation of alcohol or hydrocarbon chemical fuels and the like by the photocatalysis and reduction of CO2.

The invention discloses a preparation method of a functional magnetic absorbent used for treating industrial wastewater. The method comprises the following four steps of: (1) preparing a ferroferric oxide nanocluster with a high magnetic saturation value by solvothermal synthesis; (2) modifying the ferroferric oxide nanocluster surface into a double-bond functional group by adopting a sol-gel process; (3) wrapping the ferroferric oxide nanocluster surface with a polymer shell containing an epoxy functional group in a distilling, precipitating and polymerizing manner; and (4) modifying a microsphere surface into an amino group or a carboxyl group through a ring-opening reaction of the epoxy group. The magnetic absorbent is high in functional group content, fast in magnetic responsiveness, easy for magnetic separation, regular in structure, stable in chemical and physical performances and high in dispersion stability in an aqueous solution; and the surface-modified amino and carboxyl functional groups can efficiently adsorb a plurality of heavy metals or organic pollutants, so that the magnetic absorbent can be applied to the field of industrial wastewater treatment. The preparation method is simple to operate and controllable in process and has a good application prospect.

The invention discloses a preparation method of nano ferrate / carbon nano tube composite materials, which utilizes a carbon nano tube as a supporting material and adopts a method of solvothermal synthesis to prepare a series of nano ferrate / carbon nano tube composite materials which are even in dispersion, have magnetic property, include nano cobalt ferrite / carbon nano tubes, ferrous acid nickel / carbon nano tubes, ferrous acid copper / carbon nano tubes, zinc ferrite / carbon nano tubes, ferrous acid manganese / carbon nano tubes and the like, and have certain universality. Compared with the prior art, the preparation method of the nano ferrate / carbon nano tube composite materials utilizes ethanol as solvent. The prepared nano materials are uniform in grain size and excellent in performance and have good application prospect and economic benefits on aspects of photocatalysis sewage treatment, lithium ion batteries and the like.

The invention relates to the technical field of inorganic synthesis, and aims to provide a synthetic method of a carbon quantum dot material. The method is characterized in that a reducing agent and a reaction substrate are put in a solvent and react at 100-200DEG C for 2-72h to synthesize the carbon quantum dot material; the molar ratio of the reducing agent to the reaction substrate is 1-100; and the mass ratio of the solvent to the reaction substrate is 20-1000. The method is simple and effective, adopts a solvothermal synthesis process to substitute traditional tedious synthetic processes, adopts an organic matter to substitute traditional expensive substances as a carbon precursor and adopts L-ascorbic acid and its analogues as the reducing agent. The whole process of the method has the advantages of high efficiency, environmental protection and low cost.

The invention discloses a preparation method and an application of a core-shell TiO2 / ZnIn2S4 composite photocatalyst. The preparation method comprises the following steps: performing ultrasonic dispersion on TiO2 in an ethanol solvent; adding zinc chloride and indium nitrate into the ethanol solvent, and stirring to dissolve; mixing the two systems, and adding thioacetamide; transferring the mixed system into a high pressure kettle to react; performing vacuum filtration, washing, drying and grinding on a product after the reaction is finished to obtain the core-shell TiO2 / ZnIn2S4 composite photocatalyst. According to the method, the core-shell TiO2 / ZnIn2S4 composite photocatalyst is prepared in one step by adopting a solvothermal synthesis method, the catalyst is wide in visible light response range and high in photocatalysis activity, is applicable to organic dye wastewater degradation, and can be used for degrading methylene blue-containing wastewater in the field of solar energy transformation and utilization and environment management.

The present invention belongs to the field of environmental science and engineering technology, in the concrete, it relates to a preparation method of new-type mesopore bismuth titanate photacatalyst for degrading organic pollutant. Said method includes the following steps: using bismuth nitrate and titanate as main raw material, using block interpolymer surfactant as structure guide agent, adopting acetic acid as hydrolysis catalyst, utilizing solvent thermal synthesis method to prepare titanium-bismuth composite oxide gel, making said gel undergo the processes of filtering, drying, high-temperature calcining and crystallizing so as to obtain the mesopore bismuth titanate material with photocatalytic activity.

The invention discloses a preparation method of a skutterudite group thermoelectricity lump material, which adopts the combination of solvent thermosynthesis and vacuum melting. In the skutterudite MSb3, M equals to Co, Rh, and Ir, comprising the skutterudite MSb3; M bits or Sb bits-doped MSb3; Ag, Cu, Zn, Cd, Pb, Sn, Ga or In-filled MSb3; doped and filled MSb3 and MSb3 which is compounded with a second phase. The preparation method comprises the steps of: material blending, thermal reaction of the solvent, washing, thermal treatment and sealing melting. The invention discloses a preparation method of a skutterudite group thermoelectricity lump material compounded with the second phase, when adopting the method, second phase nano powder such as ZrO2 with the mass percentage of 0.05 percent to 5 percent is added for supplement in the step of the material blending. Compared with the existing commonly used spark plasma sintering or hot pressed sintering after simple substance mechanical alloying, or the plasma sintering or the hot pressed sintering after long-time high temperature solid phase reaction of the simple substance materials, the obtained materials are more compact and lower in cost.

The invention relates to a sea urchin like NiCo2S4 electrode material solvothermal synthesis method. The method includes 1, dissolving NiCl2 6H2O, CoCl2 6H2O and CS (NH2) 2 into deionized water, stirring for even mixing, adding diethanolamine after the solution is clarified, and stirring continuously till the solution is mixed evenly; 2, transferring the solution obtained by the step 1 to a high-pressure reaction kettle, heating at the temperature of 140 to 160 DEG C and remaining for 8 to 16 hours; 3, waiting the temperature of the high-pressure reaction kettle to decrease naturally to the room temperature, washing the product of step 2 before transferring to a drying oven for drying, and obtaining the NiCo2S4 electrode material. Compared with the prior art, the method has the advantages that the synthesis method is facilitated and environment-friendly, the purity of the product is high, the yield is large, and the performance is excellent.

The invention belongs to the field of a precious metal doped oxide semiconductor thin film material and in particular relates to an Ag / TiO2 thin film material and a preparation method thereof. The invention is mainly characterized in that a sol-gel method and a solvent thermal synthesis method are combined, a TiO2 seed layer is prepared on the surface of a substrate by adopting the sol-gel method, and then a Ag / TiO2 nano slice is grown on the surface of the substrate of the TiO2 seed layer by adopting the solvent thermal synthesis method, thus the Ag / TiO2 thin film material which is composed of the Ag / TiO2 nano slice and is vertically grown on the substrate is obtained. The Ag / TiO2 thin film material provided by the invention has the advantages of titanium dioxide semiconductor material and silver and plays an important role in the fields such as antibacterial materials, solar cells, photocatalysis, deodorization, self cleaning and the like.

The invention discloses a preparation method for a molybdenum disulfide nanometer nuclear shell nano-structure. By adopting a solvent thermal synthesis method, the preparation method specially comprises the following steps: (1) dissolving Na2MoO4.2H2O, Na2S and ascorbic acid into a mixed solvent, adding surface active agent, conducting centrifugal agitating to be evenly dispersed into the solution, and finally adjusting the pH value of the solution as 12-14 with acid; (2) agitating the solution obtained from step (1), transferring into a stainless steel reaction kettle, sealing, conducting constant-temperature reaction, cooling to room temperature to obtain reaction product; and (3) separating the reaction product, washing and drying to obtain the molybdenum disulfide nanometer nuclear shell nano-structure. The method is simple in process, and low in cost, the product prepared is high in purity and yield, has an important application in the fields of friction, photochemistry, lithium electricity and the like, and is hopefully used for large-scale industrial production.

The invention discloses a preparation method of a temperature sensitive adsorbent of halloysite magnetic composite material surface blotting, belonging to the technical field of environment functional material preparation. The preparation method comprises the following steps: preparing a ferroferric oxide / halloysite nanotube (Fe3O4 / HNTs) magnetic composite material through a simple and effective solvent thermosynthesis method; and then, performing ethylene modification on the magnetic composite material; and preparing the temperature sensitive adsorbent of halloysite nanotube magnetic composite material surface blotting through a radical polymerization process, and utilizing the adsorbent in selective identification and separation of 2,4,5-trichlorophenol in aqueous solution. The prepared temperature sensitive blotting adsorbent has excellent thermal and magnetic stability, sensitive magnetic and thermal induction effect, high adsorption capacity, excellent reversible adsorption / release function with temperature and obvious TCP molecular identification performance.

The invention belongs to the technical field of luminescent materials, and particularly relates to a zinc coordination polymer [Zn(HL)(HBPEB)] and a method of synthesizing the same. The zinc coordination polymer [Zn(HL)(HBPEB)] disclosed by the invention is a photo-induced yellow fluorescent material having a molecular structure shown below. The invention also provides a method of synthesizing the zinc coordination polymer [Zn(HL)(HBPEB)]. The zinc coordination polymer [Zn(HL)(HBPEB)] is prepared from zinc nitrate, ligand H4L and BPEB by using a solvothermal synthesis method. The zinc coordination polymer [Zn(HL)(HBPEB)] has higher thermal stability and is a novel photo-induced yellow fluorescent material.

A SAPO-34 molecular sieve of a larger specific surface area and a hollow alumina-rich hierarchical pore structures and application thereof in a reaction that uses methanol to prepare low carbon olefin, belongs to the technical field of molecular sieves. The product by the invention is obtained by taking triethylamine as a template agent, adopting a traditional hydrothermal or solvothermal synthetic method, taking water or alcohol as a solvent, and introducing polyethylene glycol polymer in a high pressure reactor under an autogenous pressure through an in-situ alumina-rich method. A synthetic SAPO-34 molecular sieve sample is in a hollow and hierarchical pore structures cubic shape, the average crystal size is 5-10 [mu]m, and the mesoporou size is 2-15 nm. According to the invention, the yield of the synthetic SAPO-34 molecular sieve sample is extremely high, and can reach over 90%. The invention has extremely high selectivity of low carbon olefin in a reaction that uses methanol to prepare olefin (MTO), particularly the total yield of ethylene and propylene can reach over 85%, and the SAPO-34 molecular sieve is extremely suitable for industrial amplification application.

The invention discloses a method for preparing hydroxyapatite nano-structure microspheres, which comprises the following steps of: mixing a calcium source and a phosphorus source in a molar ratio of n(Ca2+) to n(PO43-) of 5:3; adding water into the mixture and regulating the pH of a system to the range of 0.5 to 3.5 by acid; then adding a chelating agent and urea; adding glycerine; and preparing the hydroxyapatite nano-structure microspheres by a solvent thermal synthesis method, wherein the volume ratio of glycerine to water is 0-12:1 and the concentration of the calcium source is in the range of 0.02 to 0.2mol / L. The method adopts a one-step synthesis mode. A surfactant is not used. The method has simple preparation process and relatively mild reaction condition. The hydroxyapatite nano-structure microspheres have good biocompatibility and large specific surface area and have loading rate and obvious release effect when being used as a medicament release carrier.

The invention relates to a preparation method of a fusiform nanometer powder of alpha-Fe2O3. A water or solvent thermal synthesis is used for respectively dissolving an original reaction material, ferric nitrate and a mineralizer, potassium hydroxide into a mixed solvent which is composed of ethylene glycol and water; then a potassium hydroxide solution is added drop by drop into a ferric nitrate solution to get a suspension liquid precursor which is used for the water or solvent thermal reaction; the suspension liquid precursor is sealed into a reactor and is processed by heat treatment for 4 hours to 36 hours at the temperature of 160 DEG C to 240 DEG C to get the fusiform nanometer powder of alpha-Fe2O3; the length of the kernel is not less than 200 nanometers and the largest diameter is not less than 100 nanometers. The products of the invention have the advantages of stable quality, high purity, good particle dispersion and excellent catalyzing property; the preparation process is simple and easy to control, has the advantages of no pollution and low cost and is easy for mass production.

The invention discloses a novel composite material based on a metal-organic framework material and a carbon nanotube and a preparation method of the novel composite material. The carbon nanotube is chemically modified, so that the outer wall of the carbon nanotube is connected with an organic ligand functional group, and the modified carbon nanotube can be combined with the metal-organic framework material through a ligand bonding effect between metal ions and the organic ligand functional group, therefore a novel porous composite material is obtained. A carbon nanotube connected with dicarboxylic acid is obtained by means of performing three reactions of carboxylation, acylating chlorination and amidation on the carbon nanotube; the carbon nanotube connected with the dicarboxylic acid is mixed with dicarboxylic acid monomers and metal salt monomers; the composite material is prepared through a solvent thermal synthesis method. The novel composite material disclosed by the invention has the advantages that the characteristics of two types of porous materials are combined, so that better adsorption and separation performances are obtained.

The invention discloses a microchannel flow method for quickly synthesizing uniform ZIF-8 nanoparticles. The method comprises the following steps of: filling 50ml of 0.6M dimethylformamide (DMF) solution of methylimidazole and 50ml of 0.2M DMF solution of Zn(NO3)2.6H2O in two injectors, feeding the two solutions into a tee mixer at a certain speed by using an injection pump at the temperature of 80DEG C, fully mixing the two solutions, introducing into a capillary quartz tube microchannel, and collecting the nano-scale ZIF-8 product at an outlet. Compared with the traditional solvent thermosynthesis method in a reactor, the method has the advantages of greatly shortening reaction time and saving energy. The synthesized ZIF-8 nanoparticles have small average particle size of about 50nm, and have the typical hexagonal structure. Moreover, by controlling reaction temperature, retention time and a reaction material ratio, the ZIF-8 nanoparticles with required size can be easily prepared continuously.

The invention discloses a copper doped composite magnetic nano-material and preparation and an application of the copper doped composite magnetic nano-material, and belongs to the fields of magnetic particle synthesis and water treatment research. Aiming at a solvent thermal synthesis process of magnetic nanoparticles, according to the invention, copper chloride and ferric chloride are taken as metal salt precursors, based on solvent thermal reaction, and through copper doping ratio adjustment, the obtained mesoporous Cu-Fe3O4 microspheres have controllable particle size (560nm-120nm), specific surface area (40-100m2 g-1) and surface charge amount, and have the characteristics of high monodispersity, uniform size, high magnetic property (130-65emu g-1) and the like, and show excellent adsorption and regenerative adsorption properties for pentavalent arsenic and trivalent arsenic in a water body. The mesoporous Cu-Fe3O4 microspheres are simple in preparation process, low in cost and high in arsenic adsorption property, can be quickly magnetically separated, and has a good application prospect.

The invention relates to a method for preparing an RGD peptide targeted ultra-small ferriferrous oxide MRI positive nanoprobe. The method comprises the steps of: conducting a one-step solvothermal synthesis method to obtain surface sodium citrate stabilized ultra-small Fe3O4 nanoparticles, then modifying NH2-PEG-RGD to the nanoparticle surface to obtain the RGD targeted ultra-small ferriferrous oxide MRI positive molecular probe. The PEG-RGD modified ultra-small ferriferrous oxide nanoprobe has long cycle time in mice, and realizes targeting T1-weighted enhancement MRI on the surface of cancer cells with alphavbeta3 integrin high expression (U87MG cells, human brain glioma cells) and subcutaneously transplanted tumor on animal level and cellular level. The Fe3O4 nanoparticles prepared by the invention can be in stably dispersed in an aqueous solution for a long time, and do not agglomerate. The preparation method provided by the invention has the advantages of simpleness, low cost and potential in industrialization and commercialization.

The invention discloses a solvothermal synthesis method for a positive material nano lithium manganese phosphate of a lithium ion battery. The method comprises the following steps: uniformly mixing two ethanol solutions containing a lithium source and a phosphate radical source respectively; adding an ethanol solution containing a manganese source, uniformly stirring, and adding an organic additive; and finally, pouring the mixed solution into a reaction kettle, sealing, raising the temperature to be 140-150 DEG C at the speed of 1-5 DEG C per minute, and heating at a constant temperature for 6-24 hours. According to the method, nanoscale LiMnPO4 with the shape of capsules, sheets or cubes can be obtained, and the method has the advantages of low equipment investment, simple process flow, slight pollution, low energy consumption, controllable shape and small product particle size.

The invention relates to a preparation method of lithium iron phosphate monocrystalline nanorods. The method is characterized in that: mixed solvent required by solvothermal reaction is constituted by ethylene glycol and water at volume ratio of 3:1-1:3; and polyethylene glycol is introduced to influence crystal nucleus formation and crystal growth, and realize solvothermal synthesis of lithium iron phosphate monocrystalline nanorods. The preparation method includes dissolving antioxidant ascorbic acid in the mixed solvent of ethylene glycol and water; sequentially dissolving phosphoric acid and ferrous sulfate hexahydrate in the mixed solvent; dropwise adding lithium hydroxide dissolved in ethylene glycol and water into the above solution containing phosphoric acid, ferrous sulfate and ascorbic acid; mixing with appropriate amount of polyethylene glycol; sealing in a reaction kettle system; and performing solvothermal reaction under high temperature 160-240 DEG C and high pressure, to obtain lithium iron phosphate monocrystalline nanorods. The product has stable quality, high purity and good particle dispersivity, which facilitates lithium ion diffusion and improves electrochemical performance of lithium ion battery. The preparation method has the advantages of simple preparation process, easy control, no pollution, low cost, and easy mass production.

The invention discloses a low-temperature denitrification catalyst based on carbonized MOFs (metal organic frameworks) and a preparation method thereof; the method comprises the steps of (1) adding Mn(NO3)2 solution and Ce(NO3)3.6H2O and Ce(NO3)3.6H2O into DMF (dimethylformamide), and adding formic acid; (2) ultrasonically shaking until a solution is mixed well; (3) subjecting a mixed solution to solvothermal synthetic reaction to obtain Mn / Ce-based metal organic framework crystal material; (4) washing the crystal material sequentially with DMF and ethyl ether, centrifugally filtering and extracting a product, and drying in an oven; (5) carbonizing a dried sample in a muffle furnace to obtain the low-temperature denitrification catalyst. The catalyst herein has good low-temperature denitrification activity; compared with existing low-temperature SCR (selective catalytic reduction) catalytic material, the catalyst has greatly improved resistance to SO2 poisoning; after SO2 is introduced, the catalyst has denitrification activity that rises instead of falling; therefore, the catalyst has great potential application prospect in terms of low-temperature SCR denitrification.

The invention provides a tin oxide nanomaterial and a preparation method thereof. One-dimensional tin oxide nanomaterial with high crystallization degree and good appearance is successfully prepared by performing solvothermal synthesis on tin chloride and alkali serving as raw materials in solution of ethanol, wherein the diameter of the one-dimensional tin oxide nanomaterial is 50 to 300nm and the length is 1 to 8 mu m. Compared with the conventional method for preparing the one-dimensional tin oxide nanomaterial, the method adopted by the invention has the advantages of good appearance of the product, high crystallization degree of crystals, low industrialization cost, simple operation and high product yield. The prepared tin oxide nanomaterial has high gas sensitivity to carbon monoxide gas and is a good gas-sensitive material.

The invention discloses a preparation method of a sulfur-doped bifunctional oxygen catalyst based on ZIF-67 (Zeolitic Imidazolate Framework) and conductive graphene, and belongs to the technical fieldof zinc-air cell catalysts. The preparation method comprises the steps of taking ZIF-67 as a template, adding a certain amount of conductive graphene, taking thioacetamide as a sulfur source, and calcining in an inert atmosphere through a one-step solvothermal synthesis method to prepare a carbon porous nano-composite. The carbon material inherits the porous structure of ZIF and effectively improves the specific surfaces of the catalyst, the active site, the specific surface area of the material and the conductivity of the material are increased by adding the conductive graphene and the sulfur source, and the conduction of electrons is more facilitated. The obtained catalyst has good oxygen reduction (ORR) and oxygen evolution (OER) electrocatalytic activity in an alkaline medium, the electrocatalytic performance of the bifunctional oxygen catalyst is improved, and the bifunctional oxygen catalyst has potential application value in the fields of energy conversion and storage.