36 results about "Zinc nitrate" patented technology

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.

This invention discloses a silicon-based anode binder for lithium-ion batteries and its preparation method, relating to the field of silicon-based anode technology. The method includes first ring-opening sulfonation of polyetheramine with 1,3-propanesulfonyl lactone in an aqueous phase to obtain sulfonated polyetheramine; then, polyacrylic acid is activated by EDC·HCl and NHS and then amidated and grafted onto the sulfonated polyetheramine to obtain sulfonated polyetheramine-grafted polyacrylic acid; finally, the aqueous solution of this graft is in-situ coordinated with 2-methylimidazole and zinc nitrate to generate ZIF-8 nanoparticles, and then succinic acid and choline chloride are added for regulation to obtain the binder. This invention achieves dual modification through molecular grafting of flexible sulfonated polyether segments and in-situ construction of a three-dimensional ZIF-8 conductive network, utilizing succinic acid and choline chloride to eliminate competitive coordination of active groups, significantly improving ionic conductivity and stabilizing the electrode structure.

The application discloses a kind of high-efficient durable water-resistant sandpaper suitable for humid environment and preparation method thereof, and high-efficient durable water-resistant sandpaper includes substrate layer, adhesive layer, abrasive layer;Adhesive layer is located in one side of substrate layer, and is formed by resin composition curing;Abrasive layer is formed by abrasive distribution, and one end of abrasive is embedded in adhesive layer;Abrasive surface has porous water-resistant interface layer formed by zinc imidazole ester frame;The porous water-resistant interface layer is obtained by forming zinc imidazole ester frame by the reaction of abrasive in zinc nitrate and 2-methyl imidazole methanol solution, whereby the sandpaper of the present application is through the synergistic effect of mechanical interlocking, chemical bonding, hydrophobic inhibition and stress buffering between abrasive and adhesive layer, solve the problem that abrasive and adhesive layer combination interface of sandpaper are softened by water, leading to non-normal shedding of abrasive, service life is reduced, and polishing effect is poor, so that the sandpaper of the present application has the polishing performance of adapting to humid environment, high efficiency and durability.

The present application relates to a kind of for CO2 hydrogenation methanol hydrophobic core-shell catalyst and its preparation method and application, belong to catalyst preparation technical field.Zirconium-based metal organic framework UiO-66 is core body, outer layer constructs hydrophobic mesoporous silica shell layer to form core-shell structure carrier.The carrier is pre-wetted with solvent before metal introduction, and copper, zinc nitrate precursor is introduced under the condition, and its wetting, penetration and migration process in channel are controlled, so that it can penetrate hydrophobic mesoporous shell layer and transport to core-shell interface and UiO-66 core surface.Subsequently, by adjusting metal deposition kinetics, copper zinc species is selectively deposited and forms active component enrichment at interface.Preferably, by controlling metal loading process, copper zinc active component is enriched and controllably distributed in hydrophobic core-shell structure, so as to improve the stability and catalytic performance of catalyst in CO2 hydrogenation methanol reaction.

The application relates to the technical field of electrocatalytic reduction of carbon dioxide, and provides a preparation method and application of a zinc-iodine diatomic pair (Zn-I / ICPs) carbon dioxide electro-reduction catalyst. The zinc-iodine diatomic pair is prepared by using nitrogen-doped carbon as a carrier and an in-situ gas-capturing MOF method, and the specific steps are as follows: first, ZIF-8 precursors are prepared by using zinc nitrate hexahydrate and 2-methyl imidazole as raw materials; then, the ZIF-8 and potassium iodide are co-pyrolyzed under a nitrogen atmosphere, the potassium iodide is used as an iodine source, zinc and iodine atoms are combined in an atomic dispersion form through a gas-phase doping mode, and a Zn-I diatomic pair is formed. The preparation method is simple and controllable, in the prepared Zn-I / ICPs, Zn sites and I sites successfully construct a synergistic catalytic center with complementary functions and electronic coupling, can effectively control an electrochemical microenvironment, accelerate water dissociation and proton transfer, and simultaneously highly effectively inhibit a hydrogen evolution side reaction, and the zinc-iodine diatomic pair can catalyze carbon dioxide electro-reduction to prepare carbon monoxide with high activity and high selectivity.

The application belongs to the technical field of metal oxide catalysts, and provides a ZnO / Co3O4 composite oxide catalyst, a preparation method and application thereof, and comprises the following steps: mixing zinc nitrate, cobalt nitrate and 2-methyl imidazole by ball milling, then putting the mixture into a crucible, performing high-temperature calcination after temperature rising, and then grinding the obtained product; wherein the mass ratio of the zinc nitrate, the cobalt nitrate and the 2-methyl imidazole is 1.6-2.4:3.12-2.32:2.6. The ZnO / Co3O4 composite oxide catalyst containing a large number of asymmetric oxygen vacancies is prepared, wherein the introduction of Zn increases the asymmetry of the oxygen defects on the surface of the material, the type of the oxygen defects on the surface of the material is changed from Co-Ov-Co to Co-Ov-Zn, the local electronic environment is changed, the activation efficiency of persulfate is improved, and thus the ZnO / Co3O4 composite oxide catalyst can be applied to removal of bisphenol A.

The application provides a functional fiber membrane for bacterial visual monitoring and response antibacterial and a preparation method and application thereof, and belongs to the field of biological medical materials. The functional fiber membrane is a fiber membrane with a double-layer structure. A lower membrane of the fiber membrane is prepared from TCS@ZIF-8 nanoparticles and poly-epsilon-caprolactone as raw materials. An upper membrane of the fiber membrane is prepared from poly-epsilon-caprolactone, polyethylene glycol and bromo-musk toluene phenol blue as raw materials. The TCS@ZIF-8 nanoparticles are prepared from the following raw materials in a weight ratio: zinc nitrate hexahydrate 1-5 parts, triclosan 1-5 parts and 2-methyl imidazole 1-5 parts. The functional fiber membrane can realize naked-eye monitoring of various bacteria in a short time, has high monitoring sensitivity and can meet the clinical diagnosis requirements. Meanwhile, the membrane has excellent antibacterial performance and can synergistically antibacterial with photocatalysis. The functional fiber membrane has a simple preparation process, is convenient to operate and is convenient to carry, provides a feasible scheme for bacterial monitoring and has application prospects.

This application discloses a modified ZIF-8 / g-C3N4 material, its preparation method, and its application. The preparation method includes the following steps: preparing g-C3N4 using urea; dissolving zinc nitrate and g-C3N4 in methanol to obtain a first mixed solution; ultrasonicating the first mixed solution; dissolving 2-methylimidazole in methanol to obtain a second mixed solution; adding the second mixed solution to the first mixed solution; continuing ultrasonication and mechanical stirring to obtain a third mixed solution; centrifuging the third mixed solution at high speed; drying the precipitate after centrifugation in a vacuum drying oven to obtain the product ZIF-8 / g-C3N4; and then modifying the above product ZIF-8 / g-C3N4 using plasma to obtain the modified ZIF-8 / g-C3N4 material. This modified ZIF-8 / g-C3N4 material exhibits good photocatalytic degradation performance.

The application discloses a supported catalyst and a preparation method and application thereof in hydrogen production by low-temperature methanol reforming, and belongs to the technical field of hydrogen production. The preparation method of the catalyst comprises the following steps: (1) dissolving cerium nitrate and zinc nitrate in deionized water, adding a template agent, stirring uniformly, adjusting pH to 8.0-9.0 by using lye, and performing hydrothermal reaction, and then performing washing, drying, calcination and reduction treatment to obtain a carrier rich in oxygen vacancies; (2) dissolving copper salt and auxiliary salt in deionized water, adding a complexing agent, stirring and dissolving, adjusting pH to 5.0-6.0 by using lye, adding the carrier rich in oxygen vacancies, and then performing impregnation, drying, calcination and reduction treatment to obtain the supported catalyst. The supported catalyst prepared by the application has the advantages of large specific surface area and large pore size, and exhibits excellent performances of high methanol conversion rate and low CO selectivity in the hydrogen production by low-temperature methanol reforming.

The application provides a MOF-based heterojunction material and a preparation method thereof, a flocculating agent and a preparation method thereof, and comprises the following steps: preparing a mixed solution A containing copper salt, polyvinylpyrrolidone and alkali, a mixed solution B containing 2-methylimidazole and an iron-based organic compound, and a mixed solution C containing zinc nitrate; the mixed solution B and the mixed solution C are sequentially added into the mixed solution A to obtain a first mixed solution, then an organic alkali is added into the first mixed solution, the first mixed solution is subjected to a first reaction under stirring, the first reaction time is 4-10 h, then the first mixed solution is subjected to standing treatment for 8-16 h, and the MOF-based heterojunction material is obtained. The MOF-based heterojunction material can be used for preparing a polymer flocculating agent, and helps to reduce the energy consumption in the process of preparing the polymer flocculating agent.

The application discloses a Chinese gall complex antibacterial dressing and a preparation method thereof. The dressing is composed of 6-9% Chinese gall tannin extract (tannin≥95%), 10-14% chitosan, 12-16% gelatin, 4-5% glycerol, 0.8-1.2% genipin, 0.1-0.3% zinc nitrate source Zn²⁺ and the balance of deionized water, has a porous film structure, a pore size of 5-10 μm, a moisture permeation amount of ≥1800 g / (m²·24h) and a breaking strength of ≥35 MPa. The preparation method comprises the following steps: ultrasonic-assisted water extraction and alcohol precipitation of Chinese gall, preparation of component solutions, blending and stirring at 40 DEG C, constant-temperature crosslinking at 38-42 DEG C, casting, drying and ultraviolet sterilization. The dressing has excellent and stable antibacterial effect, good biocompatibility, good mechanical and moisture permeation properties, simple and green preparation process and easy scaling, is suitable for wound care of burns, wounds and the like, and solves many defects of traditional dressings.

The application discloses preparation of a hierarchical porous carbon catalyst and application of the hierarchical porous carbon catalyst in sludge filtrate treatment. Zinc nitrate and 2-methyl imidazole are respectively dissolved in an organic solvent, and after mixing, MOF is generated through self-assembly under certain conditions, centrifugation, washing and drying are carried out, and then MOF powder is obtained; the obtained MOF powder is loaded on the surface of pretreated graphite felt, and high-temperature heat treatment is carried out under a nitrogen atmosphere, and then a hierarchical porous carbon catalyst is obtained. In a three-electrode system at normal temperature and normal pressure, the hierarchical porous carbon prepared by the application is used as an anode, and under the action of a weak electric field, oxygen molecules in an aqueous solution are catalytically activated to oxidize organic matters in sludge filtrate, and the COD removal rate of the sludge filtrate can reach 82.8% within 2h.

This invention discloses a method for preparing a catalyst by impregnation and its application in methanol-to-hydrogen production, belonging to the field of hydrogen production technology. The method for preparing the catalyst by impregnation includes the following steps: (1) mixing alumina, zirconium oxide, cerium oxide, pore-forming agent, surfactant, and deionized water, followed by ball milling, molding, drying, and calcination to obtain a composite support; (2) stirring and mixing copper nitrate, zinc nitrate, and deionized water, adjusting the pH to obtain an impregnation solution; (3) impregnating the composite support in the impregnation solution using an equal-volume impregnation method, followed by drying, calcination, and reduction to obtain the catalyst. The catalyst prepared by the method of this invention exhibits high methanol conversion rate and H2 selectivity in the catalytic production of hydrogen from methanol, and also demonstrates excellent stability in use.

The application discloses a preparation method of high-valence MOF crystal film for organic matter dehydration. The preparation method is as follows: a porous Al2O3 carrier is placed in an aqueous solution containing urea and hydrated zinc nitrate, a layered double hydroxide (LDH) precursor layer is obtained through reaction, then the carrier modified by the precursor layer is placed in an aqueous solution containing terephthalic acid and benzoic acid, and secondary growth is carried out. The application utilizes the LDH modified carrier method, preplants an LDH precursor layer on the surface of the porous Al2O3 carrier, and then converts the MOF crystal film through in-situ hydrothermal method. The prepared porous MOF film material has excellent stability and separation performance in an ethylene glycol / water system, and is an ideal polyhydric alcohol dehydration material.

The application provides a modified BETA zeolite, and a preparation method thereof is as follows: step 1, a BETA zeolite molecular sieve with a silicon-aluminum ratio of 50 is ultrasonically treated with a sodium hydroxide solution at a liquid-solid ratio of 5-40 mL / g for 1-24 hours, and then is placed for 0.5-2 hours, wherein the concentration of the sodium hydroxide solution is 0.1-5 mol / L, and the treatment temperature is 20-150 DEG C; step 2, the BETA zeolite molecular sieve treated in step 1 is collected, is subjected to suction filtration, is washed, is dried, is treated with an NH4NO3 solution, and is calcined to obtain modified I zeolite; step 3, the modified I zeolite is added into a zinc nitrate solution at a liquid-solid ratio of 5-40 mL / g, is stirred for 2-24 hours, and then is placed for 0.5-2 hours, wherein the concentration of the zinc nitrate solution is 0.1-3 mol / L, and the treatment temperature is 20-150 DEG C; and step 4, the modified I zeolite treated in step 3 is collected, is subjected to suction filtration, is washed, is dried, and is calcined to obtain modified II zeolite. The modified BETA zeolite can be used in a C16-C18 Fischer-Tropsch oil raw material isomerization reaction, and the service life of a catalyst is improved.

This invention relates to the field of advanced nanocatalytic materials and their formulations, specifically to a ZIF-8 derived metal single-atom solvent and its preparation method. The preparation method of the ZIF-8 derived metal single-atom solvent includes the following steps: Step 1, dissolving zinc nitrate and a target metal salt M together in a first solvent to form a precursor solution; Step 2, adding a 2-methylimidazole solution to the precursor solution for precipitation, followed by solid-liquid separation and drying to obtain the M-ZIF-8 precursor; Step 3, carbonizing the M-ZIF-8 precursor under an inert atmosphere to obtain a nitrogen-doped carbon solid material supported by a metal single atom with a porous structure; Step 4, dispersing the nitrogen-doped carbon solid material supported by a metal single atom with a porous structure in a second solvent using a periodic thermal stress pulverization dispersion method to obtain the ZIF-8 derived metal single-atom solvent.

The application belongs to the technical field of chemical analysis and detection, and relates to a synthesis method of an MXene-based nanoenzyme composite and application of the MXene-based nanoenzyme composite in detection of organophosphorus pesticides. V2CTx MXene and Fe-TCPP can be used to prepare V-TCPP(Fe) materials through a simple solvothermal method, and V-TCPP(Fe), AChE, 2-methylimidazole and zinc nitrate can be stirred at room temperature to prepare V-TCPP(Fe) / AChE@ZIF-8 materials. PVA, sucrose and V-TCPP(Fe) / AChE@ZIF-8 can be mixed and stirred to prepare a hydrogel patch. The material has a good colorimetric / chemiluminescence linear range response to OPs. The material is simple and convenient to prepare, and has the advantages of high sensitivity, a large linear range, good stability and repeatability in detection of OPs.

This invention discloses an antibacterial plastic lunchbox material and its preparation method, belonging to the field of plastic materials technology and patent classification number C08K3 / 08. The method first modifies and carboxylates mesoporous silica, then prepares a composite antibacterial precursor through zinc nitrate chelation and quaternary ammonium salt ion exchange, followed by a crosslinking reaction to obtain an antibacterial carrier. On the other hand, polylactic acid and polycaprolactone are blended to obtain a matrix, and a plastic matrix resin is prepared through graft copolymerization and ring-opening reaction. Finally, the plastic matrix resin, antibacterial carrier, polyethylene glycol 400, zinc stearate, antioxidant, and ultraviolet absorber are melt-extruded and injection-molded to obtain the antibacterial plastic lunchbox material. This method achieves a highly efficient and long-lasting antibacterial effect by synergistically anchoring zinc ions and quaternary ammonium salts to the functionalized mesoporous filler carrier and uniformly dispersing them in the graft-modified resin matrix, while the material also possesses good mechanical properties.

This invention provides a bimetallic MOF-derived carbon-based photothermal-electric conversion phase change material and its preparation method, relating to the field of solar energy conversion and storage materials technology. The method involves adding cobalt nitrate hexahydrate, zinc nitrate hexahydrate, and 2-methylimidazole to a GO suspension, and obtaining a GO@ZnCo-MOF precursor through in-situ growth. The precursor is then calcined at high temperature under an inert atmosphere to obtain a porous rGO@Co / C photothermal framework. Finally, PCMs are encapsulated within the pores of the rGO@Co / C framework using a physical wetting method to obtain the bimetallic MOF-derived carbon-based photothermal-electric conversion phase change material. The phase change composite material prepared by this invention can effectively buffer the impact of solar irradiance intensity fluctuations on system stability. During periods of intermittent or no-light conditions, the material maintains a constant system temperature through a latent heat release mechanism of phase change.

This invention discloses a method for synthesizing a low-silver-loaded nitrogen-doped carbon electrocatalyst to suppress hydrogen evolution. The method involves preparing materials required for the low-silver-loaded nitrogen-doped carbon electrocatalyst, including benzimidazole, melamine, zinc nitrate, hexadecyltrimethylammonium bromide, a polyol mixed solvent, and an aqueous solution of silver nitrate. The polyol mixed solvent is prepared by processing methanol, ethanol, ethylene glycol, and isopropanol. Benzimidazole, melamine, zinc nitrate, and hexadecyltrimethylammonium bromide are dissolved in the polyol mixed solvent. The method of synthesizing the low-silver-loaded nitrogen-doped carbon electrocatalyst to suppress hydrogen evolution uses benzimidazole and melamine as a composite nitrogen source, zinc nitrate as a metal source, and hexadecyltrimethylammonium bromide as a dispersant. The catalyst is in situ complexed with trace amounts of silver nitrate in a polyol mixed solvent, followed by gradient pyrolysis and acid washing to obtain the low-silver-loaded nitrogen-doped carbon electrocatalyst.

The invention provides an organic-inorganic hybrid one-dimensional tetranuclear zinc crystal material and a preparation method thereof, and belongs to the field of organic-inorganic hybrid materials and crystal materials. The chemical formula of the organic-inorganic hybrid one-dimensional tetranuclear zinc crystal material is [Zn (C12H8N2) (H2O)] 2 [Zn (C12H8N2) (C3H2O4) (H2O) 2] 2 (NO3) 4. 4H2O, the organic-inorganic hybrid one-dimensional tetranuclear zinc crystal material belongs to a triclinic system, and the space group is P1. A hydrothermal synthesis method comprises the following steps: adding phenanthroline dissolved in absolute ethyl alcohol into zinc nitrate, malonic acid and water, adjusting the pH value to a proper value by using a sodium hydroxide solution under a stirring state, and transferring the mixed solution into a closed system for hydrothermal reaction. The crystal material has strong fluorescence emission at the wavelength of 480 nm under the excitation of light with the wavelength of 320 nm, and can be used as a potential high-quality luminescent material.

The invention discloses a binder-free transition metal sulfide composite nitrogen-doped graphene negative electrode material and a preparation method thereof, and belongs to the technical field of secondary battery negative electrode materials. According to the technical scheme, the preparation method comprises the following steps: 1) dissolving zinc nitrate, cobalt nitrate and nitrogen-doped graphene in a mixed solution of ethanol and water, uniformly mixing, adding ammonium fluoride and urea, and continuously stirring; 2) adding foamed nickel and the uniformly mixed solution into a high-pressure reaction kettle for hydrothermal treatment, cooling, washing and drying to obtain a Zn-Co-precursor; (3) calcining the Zn-Co-precursor in an inert atmosphere, and (4) adding the Zn-Co-precursor into a high-pressure reaction kettle containing a sulfur source for hydrothermal vulcanization treatment, washing and drying to obtain the ZnCo2S4-coated NGr / NF negative electrode material.The graphene negative electrode material can improve the overall performance and stability of a secondary battery.

The application belongs to the field of hydrogen production material preparation, and in particular to a preparation method of a nano-cone supported nanosheet electrocatalyst. The method comprises: dissolving 0.5-1.0 g of cobalt nitrate, 0.2-0.5 g of zinc nitrate, 0.05-0.1 g of ammonium fluoride and 0.3-0.5 g of urea into 40-80 ml of water, pretreating foamed nickel, stirring, reacting, cooling, cleaning and drying; calcining the prepared sample at 300-400 DEG C for 1-3 h to obtain a ZnCo2O4 sample. Then, an electrolyte is 0-0.5 mol / l cobalt nitrate solution. The ZnCo2O4 sample grown on the foamed nickel is used as a working electrode. Ag / AgCl is used as a reference electrode, and Pt is used as a counter electrode to perform an electrochemical deposition reaction at a corresponding electrodeposition potential of-0.5-1.5 V for 5-25 min. The sample is washed and dried. Calcining the sample in air at 300-400 DEG C for 1-3 h can obtain a nano-cone supported nanosheet ZnCo2O4@Co3O4. The nano-cone supported nanosheet material can solve the problems of material uniformity, accelerate electron transmission, improve active site exposure and the like.

Disclosed in the present invention are a preparation method for a catalyst for a dehydration-condensation reduction reaction, the resulting product and the use. The preparation method comprises the following steps: spreading activated carbon evenly in a fixed bed, then continuously introducing a mixed solution of copper nitrate, zinc nitrate and zirconium nitrate into the fixed bed, and enabling the mixed solution to be in full contact with an activated carbon layer; roasting the activated carbon which is in full contact with the mixed solution, so as to obtain activated carbon loaded with copper oxide-zinc oxide-zirconium oxide; and dispersing the active carbon loaded with copper oxide-zinc oxide-zirconium oxide into an organic solvent, then adding a sulfiding agent, subjecting same to a sulfurization reaction, and filtering, washing and drying same after the reaction, so as to obtain the catalyst for a dehydration condensation reduction reaction. The preparation method for a catalyst of the present invention is simple and convenient to operate, low in cost and small in environmental pollution, can be applied to the dehydration condensation reduction reaction of various ketones or aldehydes and amines, improves the selectivity of the reaction, reduces side reaction products, and has a good catalytic effect and industrial development prospects.

This invention discloses a mesoporous cobalt-zinc bimetallic single-atom catalyst, its preparation method, and its application, belonging to the field of catalyst material technology. The method includes the following steps: S1, zinc nitrate hexahydrate and 2-methylimidazole are added to methanol and mixed to obtain solution A and solution B. Solution A is then added to solution B and mixed. The mixture is stirred at room temperature, and after centrifugation, washing, drying, and grinding, ZIF-8 powder is obtained. S2, cobalt nitrate hexahydrate and 1,10-phenanthroline monohydrate are added to methanol and mixed. Then, ZIF-8 powder is added, and the mixture is stirred at 50°C. After centrifugation, washing, drying, and grinding, Co-phen / ZIF-8 powder is obtained. S3, the Co-phen / ZIF-8 powder is calcined to obtain the mesoporous cobalt-zinc bimetallic single-atom catalyst. The catalyst prepared by this invention exhibits excellent performance in the catalytic synthesis of cyclic carbonates.