345 results about "Zinc nitrate" patented technology

The invention provides a technical application method for strengthening oxidation performance of Fenton reaction by a defect-rich carbon-based cocatalyst, and relates to the technical field of advanced oxidation catalysts for sewage treatment. Zinc nitrate and 2-methylimidazole are assembled in a methanol solution through a template method, a ZIF-8 material is obtained after centrifugal cleaning, the ZIF-8 is further carbonized through pyrolysis, Zn element is evaporated in the pyrolysis process, a porous and defect-rich carbon-based cocatalyst is obtained, the porous and defect-rich carbon-based cocatalyst is introduced into a Fenton oxidation system, circulation of Fe < 3 + > / Fe < 2 + > in the Fenton reaction can be efficiently promoted, and the catalytic activity of the catalyst is improved. Fe < 2 + > regeneration is enhanced, and the generation capability of active species of a Fenton reaction system is enhanced, so that the removal efficiency of pollutants in water is improved.

The invention relates to a preparation method of a terephthalic acid and 2-methylimidazole organic framework catalyst, and relates to a preparation method of a high polymer material catalyst, the preparation method comprises the following steps: weighing C6H4 (COOH) 2 and 2-methylimidazole, dissolving C6H4 (COOH) 2 and C4H6N2 in N, N-dimethylformamide (DMF), weighing zinc nitrate hexahydrate (Zn (NO3) 2.6 H2O), dissolving in DMF, and preparing into a solution; the preparation method comprises the following steps: mixing a C6H4 (COOH) 2 solution and a C4H6N2 solution in proportion, and uniformly stirring; slowly adding the mixed ligand solution into a mixed solution of zinc nitrate hexahydrate (Zn (NO). 6HO) dissolved in DMF (Dimethyl Formamide), and transferring into a high-pressure reaction kettle for reaction; after cooling, centrifugally separating to obtain a white solid product, washing with methanol, and drying to obtain the Zn-MOF catalyst. The Zn-MOF catalyst provided by the invention can be widely applied to polyester synthesis, esterification reaction and other organic catalytic reactions, and especially has significant advantages in PBAT synthesis.

The invention relates to the technical field of semiconductor gas sensors for gas detection, in particular to an in-situ construction method and application of a gas sensor for volatile aroma substance detection, and the in-situ construction method comprises the following steps: mixing an aqueous solution of zinc nitrate hexahydrate and an aqueous solution of 2-methylimidazole according to different molar ratios to obtain a precursor solution; upwards fixing a planar electrode on the surface of a glass slide, and then transferring the planar electrode into the precursor solution; carrying out hydrothermal reaction on the precursor solution at 90 DEG C for 4 hours, after the hydrothermal reaction is finished, cooling to normal temperature, taking out the glass slide, washing the surface of an electrode by using deionized water, removing impurities, and then carrying out drying treatment; calcining the obtained dried electrode in an air atmosphere at 500 DEG C for 2 hours to construct an in-situ growth semiconductor sensor; according to the present invention, the rapid sensing response on nine volatile aroma substances is achieved, and the excellent gas sensitive characteristic is represented in the gas sensitive research on the volatile substance ocimene in the volatile aroma substances.

The invention discloses ternary synergistic nano-enzyme hydrogel as well as a preparation method and application thereof, and relates to the technical field of biomedical materials. The preparation method comprises the following steps: dissolving zinc nitrate hexahydrate and ferric nitrate nonahydrate in methanol; dissolving 2-methylimidazole in methanol, adding into a metal salt solution, stirring, and sequentially centrifuging, washing and drying to obtain Fe / ZIF-8 nano-enzyme; the preparation method comprises the following steps: adding methacrylated gelatin and hyaluronic acid into deionized water, stirring, cooling to room temperature, and refrigerating to obtain a GelMA-HA precursor solution; and adding the Fe / ZIF-8 nano-enzyme into the GelMA-HA precursor solution, stirring, injecting into a mold, and carrying out ultraviolet light cross-linking curing to obtain the ternary synergistic nano-enzyme hydrogel. According to the hydrogel disclosed by the invention, active oxygen is efficiently removed and oxygen is produced through Fe / ZIF-8 nano-enzyme, and cartilage repair is promoted in combination with lubrication and slow release functions of gelatin hydrogel, so that a new strategy is provided for treatment of osteoarthritis.

The invention discloses a self-lubricating aluminum coating and a preparation method thereof.The preparation method comprises the steps that molybdenum disulfide is pretreated through a silane coupling agent, tetraethoxysilane mixed liquor is added, the pH is adjusted to be 9-10, a water bath reaction is conducted, and molybdenum disulfide-silicon dioxide microcapsules are obtained after high-temperature strengthening treatment; respectively adding a zinc nitrate solution and a hexamethylenetetramine solution, adjusting the pH value to 10-11, carrying out a high-temperature and high-pressure hydrothermal reaction to obtain zinc oxide nanorods, and carrying out ball milling treatment on the zinc oxide nanorods, microcapsules, stearic acid and zirconium oxide balls under the protection of argon to obtain doped microcapsules; after raw materials are pretreated, the raw materials and a dispersing agent solution are added into a mixer respectively, spraying powder, a pretreated base body and the spraying powder are obtained after mixing treatment, spraying treatment is conducted on the surface of the base body through a plasma spraying method, and the self-lubricating aluminum coating is obtained after vacuum annealing treatment. Therefore, the obtained self-lubricating aluminum coating is low in friction coefficient, high in performance and excellent in self-lubricating property.

The invention relates to the technical field of catalyst preparation, in particular to a preparation method of a modified catalyst and application of the modified catalyst in methanol regeneration in methane conversion, and the preparation method comprises the following steps: S1, mixing zinc nitrate, urea, a mesoporous regulating agent and deionized water, and stirring under a water bath condition; s2, aging the mixed solution obtained in the step S1 at 68-70 DEG C for 2-3 hours, centrifugally separating, washing the solid with deionized water until the solid is neutral, washing with absolute ethyl alcohol, and drying to obtain precursor powder; and S3, ball-milling and mixing the precursor powder, urea and the load modifier for 20-30 minutes, calcining in a muffle furnace in an air atmosphere, naturally cooling, grinding, and sieving with a 200-mesh sieve to obtain the nitrogen-doped modified catalyst. Aiming at the field of preparing high-value chemicals from methane through photocatalysis, the invention provides a method for inhibiting the peroxidation of methane by constructing chemical bonds to solve the problem of generating carbon dioxide by peroxidation of methane, and provides a new method for solving the problem of peroxidation of methane.

The invention relates to the technical field of batteries, in particular to a core-shell material, a preparation method, a negative electrode material and a battery. The method provided by the invention comprises the following steps: processing metal salt raw materials of aluminum, iron, cobalt, nickel, zinc and lanthanum into a high-entropy metal oxide; taking silicon particles as a core layer, gasifying a high-entropy metal oxide, and depositing the gasified high-entropy metal oxide on the surface of the core layer to form a coating layer so as to obtain Si (at) HEO particles; depositing a zinc layer on the Si-coated HEO particles to form a growth layer on the surface of the coating layer, dispersing the Si-coated HEO particles in a Si-coated HEO solvent, adding a zinc nitrate aqueous solution and a 2-methylimidazole aqueous solution for reaction, and growing a shell layer on the growth layer on the surface of the coating layer to obtain Si-coated HEO-ZIF particles; and mixing the acidic solution and the Si (at) HEO (at) ZIF particles to form a secondary pore channel, and separating to obtain the core-shell material. The core-shell material provided by the invention solves the problems of low stress dispersion efficiency, low ion transmission and poor volume expansion rate of the existing core-shell material.

The invention discloses a catalyst for preparing trichlorosilane and a catalytic preparation method of trichlorosilane. The catalyst is prepared from the following components in percentage by mass: weighed copper nitrate, zinc nitrate, aluminum nitrate, lanthanum nitrate and the balance of a carrier, the preparation method comprises the following specific steps: S1, filling a catalyst; S2, purifying raw material gas; S3, reacting; and S4, separating and purifying a product, namely discharging a reacted gas product from an outlet of a reactor, and condensing through a condenser. In the prepared catalyst, the activity and selectivity of the catalyst are remarkably improved through the synergistic effect of the copper-zinc-aluminum composite oxide and the rare earth element lanthanum, the electronic structure and the surface acid-base property of the catalyst can be adjusted through doping of lanthanum, the reaction of silicon powder and hydrogen chloride is promoted, meanwhile, side reactions are inhibited, and the service life of the catalyst is prolonged. And the yield of trichlorosilane is improved.

The invention discloses a ZnF2 (at) FeF3. 0.33 H2O positive electrode material as well as a preparation method and application of the ZnF2 (at) FeF3. 0.33 H2O positive electrode material. The preparation method comprises the following steps: step 1, uniformly mixing ethanol and PEG-400 to obtain a mixed solvent; 2, ferric nitrate and zinc nitrate are dissolved in a mixed solvent, then an HF aqueous solution is dropwise added into the obtained solution under stirring, after stirring, the obtained mixed solution is transferred into a stainless steel high-pressure kettle to be heated in a closed mode and cooled to the room temperature, a product is washed, centrifuged and dried in vacuum, and powder is obtained; 3, the powder is placed in a tubular furnace and subjected to heat preservation treatment in the argon atmosphere, then the powder is naturally cooled to the room temperature, a product is taken out and ground, and the ZnF2-coated FeF3. 333 H2O material is obtained. By doping ZnF2, FeF3. 0.33 H2O has higher electronic conductivity and a more stable structure, and an all-solid-state lithium battery prepared from the FeF3. 0.33 H2O has higher specific capacity and better cycling stability.

The invention relates to the technical field of low-zinc composite active agents, in particular to a low-zinc efficient composite active agent for blended rubber and a preparation method thereof.The preparation method comprises the following steps that zinc acetate, zinc nitrate, zinc sulfate and urea are mixed to prepare nano-zinc oxide, and the nano-zinc oxide is modified with polypropylene glycol to obtain modified nano-zinc oxide; mixing and stirring a dispersing agent, stearic acid, modified nano zinc oxide, multi-walled carbon nanotubes and magnesium oxide under the protection of inert gas to prepare a blend, and curing and molding the blend through a condensation granulation process to obtain the low-zinc high-efficiency composite activator for blended rubber. The prepared low-zinc efficient composite active agent for the blended rubber shortens the vulcanization time of the blended rubber, is excellent in dispersity and enhances the mechanical properties, including tensile strength and elongation at break, of the blended rubber, and in addition, the preparation method is simple and convenient to operate and low in cost and has a good industrial application prospect.

The invention belongs to the technical field of aviation fuel, and provides a method for producing sustainable aviation fuel by utilizing straws, which comprises the following steps: firstly, preparing synthesis gas from the straws; then carrying out a catalytic reaction on the synthesis gas and dimethyl ether through a primary molecular sieve catalyst, carrying out a catalytic reaction on the obtained catalytic product through a secondary metal catalyst, and separating to obtain ethanol; then preparing ethylene from the ethanol; and finally, preparing the aviation fuel from ethylene. The preparation method of the primary molecular sieve catalyst comprises the following steps: mixing a phosphoric acid solution with deionized water, adding a template agent according to a molar ratio of phosphoric acid to the template agent of 1: (0.5-0.55), and adding an aluminum source, a cerium source and silica sol while stirring to obtain gel; heating and crystallizing the gel; centrifugally washing the product to be neutral, drying and roasting; immersing the roasted product into a zinc nitrate solution, drying and calcining to obtain a zinc-loaded product; and performing dealumination treatment on the zinc-loaded product by using a citric acid solution, and roasting to obtain the zinc-loaded catalyst. According to the method, the ethanol yield in the aviation fuel production process can be remarkably improved.

The invention relates to the technical field of supercapacitors, and particularly discloses a spherical hollow multi-layer high-entropy metal oxide and a preparation method and application thereof. The spherical hollow multi-layer high-entropy metal oxide is prepared by the following steps: cross-linking metal cation nitrate comprising iron nitrate nonahydrate, zinc nitrate hexahydrate, copper nitrate hexahydrate, cobalt nitrate hexahydrate and nickel nitrate hexahydrate with dextrose monohydrate to generate spherical high-entropy metal hydroxide FeZnCuCoNi-HO with a solid core structure, and annealing to induce the metal hydroxide. And the spherical hollow multi-layer high-entropy metal oxide is formed. Compared with the prior art, the high-entropy metal oxide is prepared through a low-energy-consumption and simple synthesis method, the problem of volume change of the high-entropy metal oxide serving as an electrode material in the circulation process is solved, more reaction active sites are provided, an ion diffusion path is improved, and the specific capacitance of the composite material is improved while the specific capacitance of the composite material is improved. And the stability of the material is maintained, so that the energy storage performance of the supercapacitor is improved.

The invention belongs to the field of all-vanadium redox flow batteries, and particularly discloses a bismuth alkene nanosheet modified defect-rich graphite felt electrode for an all-vanadium redox flow battery and a preparation method of the bismuth alkene nanosheet modified defect-rich graphite felt electrode for the all-vanadium redox flow battery. The preparation method comprises the following steps: dissolving zinc nitrate (Zn (NO3) 2) in a solvent to prepare a saturated solution, soaking TGF in the saturated solution, drying, and calcining in a nitrogen atmosphere to prepare porous graphite felt (CGF) of which the surface is rich in carbon defects; the preparation method comprises the following steps: dissolving bismuth chloride (BiCl3) in a prefabricated electrolyte (containing V2 (SO4) 3 and H2SO4 solution with a certain concentration), and depositing on the surface of the CGF by adopting a constant current density electrodeposition method to form a few layers of bismuthene nanosheets, so as to prepare the BieneNF-CGF electrode. The prepared electrode shows excellent electrochemical activity and interface stability, the electrode reaction kinetics and the overall performance of the battery can be remarkably improved, high-rate, high-energy-efficiency and long-cycle-life all-vanadium redox flow battery application is achieved, and good industrial application prospects are achieved.

The invention provides a high-performance organosilicon sealant for electronic packaging, and relates to the technical field of organosilicon sealants. The organic silicon sealant is prepared from the following raw materials: methyl vinyl silicone oil, vinyl dimethyl silane, a platinum catalyst, fumed silica, a B4Cw (at) ZrO2 compound, ethynyl cyclohexanol, a silane coupling agent, a titanate coupling agent, a cerium-zinc composite antioxidant and an auxiliary antioxidant. The B4Cw (at) ZrO2 compound is prepared from boron carbide whiskers and nano zirconium oxide sol; the cerium-zinc composite antioxidant is prepared from cerium nitrate, zinc nitrate and ammonia water. The preparation method of the high-performance organic silicon sealant for electronic packaging comprises the following steps: pretreating boron carbide whiskers, synthesizing a B4Cw-coated ZrO2 compound, preparing a cerium-zinc composite antioxidant, preparing a basic rubber material, and preparing the organic silicon sealant. The prepared organic silicon sealant is high in mechanical strength, excellent in elastic property and high in durability.

The invention relates to the technical field of catalysts, in particular to preparation and application of a B-site La-doped magnetic nano ZnFe2O4 catalyst.The preparation method of the catalyst comprises the following steps that zinc nitrate, ferric nitrate, lanthanum nitrate and cerous nitrate are selected as base materials, the molar ratio of the zinc nitrate to the ferric nitrate to the lanthanum nitrate to the cerous nitrate is 1: 1.5: 0.5: 0.3, and the molar ratio of the zinc nitrate to the ferric nitrate to the lanthanum nitrate to the cerous nitrate is 1: 1.5: 0.5: 0.3; zinc nitrate, ferric nitrate, lanthanum nitrate and cerous nitrate are dissolved in a eutectic solvent in proportion, then modified citric acid is added as a complexing agent for mixing, and carbon nanotube powder and zinc acetate are added in the process. According to the scheme provided by the invention, the B site of the catalyst is directionally occupied by La, Zn < 2 + > activity loss caused by A site doping is avoided, the stability and catalytic effect of the catalyst are improved by adding Ce, the carbon nanotubes and zinc acetate, and the removal rate of the catalyst to high-concentration or refractory organic matters is improved.

The invention belongs to the field of antibacterial materials, and discloses a preparation method of a composite material modified carbon-nitrogen material as well as a product and application of the composite material modified carbon-nitrogen material. In order to achieve the long-acting and efficient antibacterial performance of the nano material, g-C3N4 powder is taken and placed in methyl alcohol, zinc nitrate is added, stirring is conducted till the zinc nitrate is dissolved, then the mixture is mixed with a methanol solution of 2-methylimidazole, after the mixture is subjected to heat treatment, the mixture is mixed with a polyhexamethylene biguanide hydrochloride aqueous solution, and the nano material is obtained. A compact inert material protection layer can be grown on the surface of the material by adopting an atomic layer deposition technology. The method provided by the invention is simple to operate and can be used for batch production, the obtained composite material integrates the advantages of an organic antibacterial agent and an inorganic antibacterial agent and has long-acting and efficient antibacterial performance, and the antibacterial material obtained by the method can be applied to various fields, such as antibacterial performance modification of antibacterial plastics and textiles.

The invention provides a deodorant for air disinfection and deodorization and a preparation process thereof, and belongs to the technical field of air purification. Comprising the following components: a composite deodorizing material, a composite essential oil microcapsule, a surfactant, benzalkonium bromide and water. The preparation method comprises the following steps: mixing and dissolving calcium nitrate tetrahydrate and diammonium hydrogen phosphate, adding hexadecyl trimethyl ammonium bromide and ammonia water to prepare a mesoporous nano-hydroxyapatite precursor suspension, adding a zinc nitrate solution, and carrying out hydrothermal reaction and calcination to prepare a composite carrier material; when the composite essential oil is loaded into the composite carrier material by using a vacuum impregnation method, the composite essential oil can have a slow release effect, the long-acting deodorization effect of the deodorant is improved, and more adsorption sites can be provided for the composite essential oil, so that the loading rate of the composite carrier material to the composite essential oil can be remarkably improved, and the deodorization effect of the deodorant is improved. The deodorization effect of the deodorant is further improved.

The invention relates to the technical field of degradable plastics, in particular to a preparation process of a PET polyester degradable plastic sheet. The PET polyester degradable plastic sheet is prepared from the following raw materials in parts by mass: 80 to 140 parts of PET resin, 10 to 30 parts of PBAT resin, 5 to 15 parts of polylactic acid, 5 to 15 parts of degradation aid, 10 to 30 parts of inorganic filler, 1 to 3 parts of graphene oxide, 1 to 2 parts of zinc nitrate, 0.1 to 1 part of 2-methylimidazole, 1 to 3 parts of antioxidant, 10 to 20 parts of flame retardant, 1 to 3 parts of stabilizer and 1 to 2 parts of lubricant. The flame-retardant anti-dripping PET material has the advantages that the flame-retardant anti-dripping effect of the PET material can be obviously improved, the good mechanical property is kept, the biodegradability is obvious, and the market benefit and the social benefit are wide.

The invention discloses a synthesis method of an M-N-C zinc metal catalyst, which belongs to the field of catalyst synthesis, and comprises the following specific steps: adding a certain amount of zinc nitrate hexahydrate into a mixed solution of ethanol and water, dissolving the zinc nitrate hexahydrate in methanol, adding an addition polymer of polypropylene glycol and ethylene oxide, and carrying out ultrasonic dissolution on the mixture based on ultrasonic equipment, so as to obtain the M-N-C zinc metal catalyst. The preparation method comprises the following steps: dissolving 2-methylimidazole in methanol to obtain a solution A, dissolving 2-methylimidazole in methanol, and stirring to clarify the solution to obtain a solution B; through cooperative use of the devices, the M-N-C zinc metal catalyst with constructed mesopores is obtained, pore channels are graded on the basis of etching and regulation and control of mesoporous pore channels, the half-wave potential of the M-N-C zinc metal catalyst is improved on the basis of pore channel grading, mass transfer of reactants and products is accelerated, pore channel blockage is avoided, and the service life of the M-N-C zinc metal catalyst is prolonged. And through the porous synergistic effect, the transmission path of protons and electrons is shortened, the polarization loss is reduced, and thus the current density is improved.

The application provides a zinc phosphide negative electrode material, which comprises a zinc sheet substrate and a zinc phosphate protective layer; the zinc phosphate protective layer is obtained in situ on the surface of the zinc sheet by immersing the zinc sheet in a phosphoric acid solution; the phosphoric acid solution comprises phosphoric acid, zinc oxide, sodium fluoride, zinc nitrate, sodium perchlorate, organic ammonium and ammonia water. The zinc phosphide negative electrode material has good reversible deposition / dissolution performance, excellent energy storage performance, high stability and can be stably cycled for a long time.

The invention discloses an intelligent slow-release nano-pesticide, a preparation method thereof and application of the intelligent slow-release nano-pesticide in prevention and control of diaphorina citri. The preparation method comprises the following steps: adding a thiamethoxam methanol solution into a 2-methylimidazole solution, ultrasonically dispersing, adding a zinc nitrate solution while stirring, continuously stirring for 1 hour at room temperature, centrifuging, washing, and removing thiamethoxam to obtain THX ZIF-8 nanoparticles; the preparation method comprises the following steps: adding THX-coated ZIF-8 nano-particles into a Tris-HCl buffer solution, stirring and dispersing, adding dopamine hydrochloride, stirring, centrifuging and washing at room temperature, repeating for three times, and drying overnight to obtain THX-coated ZIF-8 / PDA solid powder, namely the intelligent slow-release nano-pesticide. The nano pesticide not only can effectively prevent and treat diaphorina citri, but also can provide a new strategy for comprehensive prevention and control of the citrus liberobacter asiaticum by reducing the ROS level in plants, enhancing the immunity of the plants and reducing proliferation of the liberobacter asiaticum in the citrus plants.

The application discloses a method for synthesizing a single-atom catalyst, which comprises the following steps of mixing raw materials: taking dimethyl imidazole, zinc nitrate and graphene oxide as solutes, and taking anhydrous methanol as a solvent to form ZIF-8@GO through stirring; taking ZIF-8@GO and thiourea as solutes, and taking anhydrous methanol as a solvent to form S / ZIF-8@GO through stirring and adsorption; first-stage pyrolysis: pyrolyzing S / ZIF-8@GO in a protective gas atmosphere to form porous carbon (S, N-C); precursor preparation: after the porous carbon is cooled, phenanthroline (Phen) and a transition metal source (M) are added into the porous carbon to form a precursor M / S, N-C@Phen; and second-stage pyrolysis: pyrolyzing the M / S, N-C@Phen precursor in a protective gas atmosphere to obtain a M / S, N-C single-atom catalyst. The synthesis method is simple and effective, can be used for large-scale synthesis of a single-atom catalyst, is suitable for synthesis of various metal single-atom catalysts, and solves the problems of complexity in the prior art and difficulty in large-scale preparation.

The invention provides a preparation method of a Cu particle-loaded spongy nitrogen-doped carbon material and an air cathode of a zinc-air battery. The preparation method comprises the following steps: dispersing Cu-ZIF into a mixed solvent of N, N-dimethylformamide and absolute ethyl alcohol, and naming as A; dissolving zinc nitrate hexahydrate, pyrazine and polyvinylpyrrolidone into a mixed solvent of DMF (Dimethyl Formamide) and absolute ethyl alcohol, and naming as B; the preparation method comprises the following steps: dissolving meso-tetra (4-carboxyphenyl) porphin into a mixed solvent of DMF and absolute ethyl alcohol, and naming as C; and pouring the dispersion liquid A into the dispersion liquid B, uniformly stirring, dropwise adding the solution C into the dispersion liquid B, stirring at room temperature, heating in a water bath, centrifuging, washing and drying to obtain the Cu-ZIF-coated TCPP. And carrying out high-temperature pyrolysis on the Cu-ZIF-coated TCPP in a tubular furnace to obtain the Cu-coated NC composite material. The material has a rich pore structure, efficient oxygen reduction activity and excellent stability, has a certain application prospect in the field of oxygen reduction, and realizes high power density and excellent charge-discharge cycle stability as an air cathode of a zinc-air battery.

The application discloses a kind of biochar with carbon fixation-carbon capture-in situ conversion function and its preparation method and application, the preparation method includes the following steps: after being washed with waste biomass water filtration, drying, with nitrogen source mixing grinding, be placed in tube furnace, in inert atmosphere sequentially pyrolysis carbonization and physical activation, after cooling nitrogen-doped biochar is obtained;Nitrogen-doped biochar is added to zinc nitrate solution, after stirring and mixing, drying is obtained with carbon fixation-carbon capture-in situ conversion function biochar.The carbon yield of biochar of the application is high, can effectively capture and fix source low concentration CO2, and in tetrabutylammonium bromide and oxidation styrene mixed solution, CO2 captured can be in situ converted into styrene cyclic carbonate, and significant carbon sequestration benefit and excellent carbon capture-in situ conversion effect are shown.

The invention belongs to the technical field of biological materials, and discloses an enzyme composite material with osteogenic antibacterial activity as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing an imidazole-2-formaldehyde solution with an alkaline phosphatase storage mother solution, then adding a zinc nitrate aqueous solution, and synthesizing the enzyme composite material in situ. The composite material disclosed by the invention has good tolerance and cycling stability, and also has osteogenic antibacterial activity.

The present invention discloses a preparation method of zinc-seed-rich carbon nanofibers for the negative electrode material of an aqueous zinc-ion battery. First, bacterial cellulose is oxidized, then soaked in a zinc nitrate Zn(NO3)2 solution to adsorb zinc ions, and then annealed to obtain zinc-seed-rich carbon nanofibers. The preparation process of the negative electrode material of the present invention is simple and low-cost, has ultra-long cycle stability and high energy density, and helps to promote the development and application of advanced flexible electrochemical energy storage devices.

The present application relates to the technical field of catalyst production, in particular to a preparation method of a high-selectivity and high-stability methanol synthesis catalyst, comprising the following steps: step 1: dissolving zirconium nitrate, zinc nitrate and aluminum nitrate in water to form a zirconium-zinc-aluminum mixed salt solution A, dissolving zinc nitrate, aluminum nitrate and copper nitrate in water to form a copper-zinc-aluminum mixed salt solution B, dissolving sodium carbonate in water to form alkali solution C and alkali solution D; adding a small amount of alkali solution C into deionized water to form deionized water E; step 2: using the salt solution A, the alkali solution C and the deionized water E to form a precipitate 1, then using the salt solution B, the alkali solution D and the precipitate 1 to react to form a precipitate 2, then heating the precipitate 2, and aging the precipitate 2; step 3: after aging, filtering and washing the precipitate 2, drying the filter cake obtained by filtering, and then calcining and molding to obtain the methanol synthesis catalyst.

The present invention discloses a preparation method and application of a composite probe for gold nanoclusters emitting enhanced fluorescence induced by the spatial confinement effect of ZIF-8 surface. HAuCl4 and glutathione are dissolved in water, the two solutions are mixed and reacted, and purified to obtain an AuNCs solution; Zn(NO3)2·6H2O and 2-methylimidazole are dissolved in methanol, the two solutions are mixed and reacted, and the generated white precipitate is treated to obtain a zeolite imidazole framework-8 solution; the obtained AuNCs solution and the zeolite imidazole framework-8 solution are mixed, stirred, self-assembled, and treated to obtain ZIF-8@(Au) nanoparticles; zinc nitrate and dimethylimidazole are added to the nanoparticle solution for reaction, and after treatment, a sandwich ZIF-8@Au@ZIF-8 nanomaterial is obtained; the nanomaterial is mixed and treated with the AuNCs solution to obtain a ZIF-8@Au loaded with two layers of AuNCs; the operation is repeated to obtain a ZIF-8@(Au@ZIF-8) loaded with n layers of AuNCs. n The present invention significantly improves the effective utilization rate of assembly space and fluorescence performance, and realizes ultra-sensitive detection of fluorescence immunoassay.

The application provides an in-situ liquid gel-forming water-retaining agent and a preparation method and application thereof. The water-retaining agent is composed of A component and B component which are applied in steps. The A component contains an aqueous solution of a natural modified polymer, and the natural modified polymer is selected from one or two of carboxymethyl chitosan, carboxymethyl cellulose or a sodium salt thereof. The B component contains an aqueous solution of a cationic crosslinking agent, and the cationic crosslinking agent is selected from one or more cations of copper nitrate, iron nitrate, zinc nitrate, manganese nitrate, chitosan quaternary ammonium salt, calcium nitrate and magnesium nitrate. The water-retaining agent can realize the integrated functions of slow release of trace elements, water retention, soil improvement and precise nutrition supply. Furthermore, the water-retaining agent is applied to crop growth in combination with the "step-by-step drip irrigation and in-situ gel formation" technology, so that the agronomic characters of crops can be significantly improved.

The invention discloses an air cathode Sn-CoSb / NC of a zinc-air battery and a preparation method of the air cathode Sn-CoSb / NC. The preparation method comprises the following steps: preparing a cobalt-doped ZIF-8 (Co-ZIF-8) precursor: mixing a methanol solution of dimethylimidazole with a methanol solution of zinc nitrate hexahydrate and cobalt nitrate hexahydrate, stirring at room temperature for 24 hours, centrifuging, washing and drying to obtain the Co-ZIF-8 precursor; the preparation method comprises the following steps: taking a small amount of N, N-dimethylformamide (DMF), adding tin tetrachloride pentahydrate and antimony trichloride, and stirring until the tin tetrachloride pentahydrate and the antimony trichloride are completely dissolved; then adding Co-ZIF-8 powder into the solution, stirring for 5 hours at room temperature, and then centrifuging and drying to obtain purple powder; and placing the powder in a tubular furnace, and carrying out high-temperature pyrolysis in an inert atmosphere to obtain the Sn-CoSb / NC electrocatalyst. The novel catalyst has excellent ORR functional activity, and as an air cathode of a zinc-air battery, high power density and excellent charge-discharge cycle stability are realized.