535 results about "Nanoflower" patented technology

The invention belongs to the technical field of composite coatings, and particularly relates to a corrosion-resistant and ultraviolet-resistant protective coating for wind power generation equipment and a preparation method thereof.The corrosion-resistant and ultraviolet-resistant protective coating for the wind power generation equipment is prepared from, by mass, 40-60 parts of gradient fluorosilicone modified polyurethane resin, 5-12 parts of core-shell type ZnO-coated MOFs composite particles, 1-3 parts of a curing agent, 1-3 parts of a curing agent and 1-3 parts of a curing agent. According to the invention, the problems of poor ultraviolet resistance, poor weather resistance, poor corrosion resistance, poor corrosion resistance, poor corrosion resistance, poor corrosion resistance, poor corrosion resistance and the like in the existing coating and the preparation process thereof are well solved; the shielding layer is single and incapable and has a poor self-repairing effect; and the coating toughness of an epoxy resin system is insufficient and cannot adapt to fatigue deformation of equipment under a vibration working condition.

The invention belongs to the technical field of SERS (Surface Enhanced Raman Scattering) detection, and particularly relates to a preparation method and application of an Ag-coated NiFe2O4 composite SERS substrate. The preparation method comprises the following steps: firstly, preparing Ag nanoparticles which are uniformly distributed and have the same size through a sodium citrate reduction method; secondly, a nanometer flower type NiFe2O4 material is prepared through a hydrothermal method and a calcination method; and finally, the novel SERS substrate Ag-coated NiFe2O4 is prepared through a physical stirring method. The novel SERS substrate made of the Ag nano particles and the nano-flower type NiFe2O4 material is constructed, and compared with a conventional SERS substrate made of independent Ag nano particles, the SERS substrate can detect stronger intrinsic Raman signals of probe molecules. As the SERS substrate needs to be compounded with a nano-flower type NiFe2O4 material during preparation, a charge transfer phenomenon can occur at an interface where the SERS substrate is in contact with probe molecules, so that intrinsic Raman signals of the probe molecules can be enhanced, and the SERS substrate can be better used for detecting and analyzing chemical substances.

The invention relates to the field of super-hydrophobic materials, in particular to a basalt fiber composite material as well as a preparation method and application thereof. According to the composite fabric material provided by the invention, a multistage micro-nano rough surface of the MoS2 nanoflowers and the silver nanoparticles is constructed on the fiber substrate, so that not only is super-hydrophobic self-cleaning realized, but also the anti-icing performance is relatively high, and particularly, rapid heating is realized by combining broadband absorption of the MoS2 nanoflowers and a local surface plasma resonance effect of the silver nanoparticles; and meanwhile, the silver nanoparticles accelerate heat conduction, so that excellent ice melting capability is obtained. The high conductivity of the silver nanoparticles constructs a conductive path, and the layered structure of MoS2 triggers interface polarization, so that the electromagnetic shielding effectiveness of the X wave band is improved. The dual antibacterial mechanism of the MoS2 nanoflowers and the silver nanoparticles also realizes broad-spectrum efficient antibiosis, the preparation method is green and environment-friendly, the cost is low, and the requirements of complex scenes such as wearable electronic equipment, medical protection, polar region protection and national defense can be met.

An electrode including a substrate, a binding compound, and a composite. The composite includes jute-activated carbon and a nickel-cobalt-layered double hydroxide (NiCoLDH). Particles of the NiCoLDH are in the form of nanoflowers with an average size of 5-15 μm. The nanoflowers comprise nanosheets with an average thickness of 5-20 nm. The particles of the jute-activated carbon are in the form of interconnected nanosheets, which form a porous carbon framework. The porous carbon framework connects the nanoflowers, thereby forming an interconnected structure in the composite. A mixture of the composite and the binding compound is coated on the surface of the substrate. The electrode can be included in supercapacitors and power banks.

The invention discloses a preparation method of a double-enzyme inorganic functional nanoflower and application of the double-enzyme inorganic functional nanoflower in preparation of a competitive ELISA (enzyme-linked immuno sorbent assay) kit for detecting clonorchiasis sinensis. Belongs to the technical field of clonorchis sinensis detection. The invention provides a preparation method of a double-enzyme-inorganic functional nanoflower composite material, which comprises the following steps: reacting clonorchis sinensis monoclonal antibody, HRP (horse radish peroxidase) and copper phosphate solution at room temperature for 12-48 hours, and coprecipitating to obtain the functional nanoflower composite material. By utilizing the characteristic that the HNFs can catalyze a substrate TMB, species limitation caused by a traditional enzyme-labeled secondary antibody is broken, the detection sensitivity is improved, and multi-host detection of clonorchis sinensis is realized.

The invention belongs to the technical field of biomedical materials, and discloses injectable heterogeneous cascade nano-enzyme antibacterial hydrogel as well as a preparation method and application thereof. The preparation method comprises the following steps: in a process of preparing cerium dioxide nano-enzyme by a reverse micelle method, introducing molybdenum disulfide nano-particles with a nano flower-shaped structure so as to deposit the cerium dioxide nano-enzyme on the surfaces of the molybdenum disulfide nano-particles in situ to obtain nano-composite particles; through electrostatic interaction, glucose oxidase is loaded on the surfaces of the nano composite particles to form a heterogeneous cascade nano enzyme material; the preparation method comprises the following steps: uniformly mixing sodium alginate and hyaluronic acid in water, and sequentially adding an NO donor, a heterogeneous cascade nano-enzyme material and a cross-linking agent to obtain the injectable heterogeneous cascade nano-enzyme antibacterial hydrogel. The preparation method is simple, and the injectable heterogeneous cascade nano-enzyme antibacterial hydrogel has a strong antibacterial effect and can be used for preparing the antibacterial hydrogel. Particularly, the compound has a remarkable killing effect on gram-negative bacteria and gram-positive bacteria.

The invention discloses a leukemia targeted therapy preparation as well as a preparation method and application thereof. Comprising a DNA nanoflower carrier targeting leukemia cells through a PTK7 receptor and benzene arsenic oxide loaded on the carrier. The DNA nanoflower carrier is obtained by rolling circle amplification, and a nucleic acid aptamer complementary sequence of targeted binding leukemia cells is introduced into a template chain subjected to rolling circle amplification. The preparation method comprises the following steps: modifying sulfydryl onto a DNA nanoflower by using DNA-Dithiol, then breaking a disulfide bond by using reduced glutathione to expose the sulfydryl, and loading benzene arsenic oxide onto the DNA nanoflower through a reaction between trivalent arsenic and the sulfydryl. The structure of the DNA nanoflower has a high surface area and high porosity, and can load a large amount of PAO, so that the killing performance on cancer cells is enhanced; the aptamer sgc8 sequence is introduced into the DNA nanoflower, so that the targeting of the DNA nanoflower to cancer cells is effectively realized; the preparation also has the advantages of being good in thermodynamic stability, easy to store, excellent in biocompatibility and the like, and has a very good application prospect.

The invention discloses a boron-containing copper-based three-dimensional metal organic framework material as well as a preparation method and application thereof, and belongs to the technical field of fine chemical engineering. The preparation method comprises the following steps: preparing Zn-based MBON from zinc salt, boric acid and imidazole through a hydrothermal method, and then completely replacing the zinc component with copper to obtain Cu-based MBON, namely the boron-containing copper-based three-dimensional metal organic framework material. The specific surface area of the material is large, and a three-dimensional nano flower-shaped unique structure is formed. The prepared material is used as a catalyst for furfural electro-hydrogenation and carbon dioxide reduction reaction, the diffusion efficiency of reactants (such as furfural and CO2) can be enhanced, rapid desorption of products (such as furfuryl alcohol and ethylene) can be promoted through the surface capillary action, meanwhile, generation of by-products caused by excessive reaction is inhibited, and the selectivity of target products is improved.

The invention discloses a nano flower-shaped covalent organic framework material as well as a preparation method, a device and application thereof, and belongs to the field of water treatment. An amino compound and an aldehyde group compound form a covalent organic framework structure with a specific flower-shaped structure under the action of a catalyst and a regulating agent, the covalent organic framework structure continues to react with a carboxyl compound, then metal is loaded, and the nano flower-shaped covalent organic framework material is obtained. Carboxyl in the carboxyl compound responds to uranium in water and does not respond to other metal ions, other interference ions are eliminated, in addition, the carboxyl compound further has sulfydryl which can fix subsequently-loaded metal ions, the loading capacity of the metal ions is improved, and the metal ions can be loaded on the surface of the metal ions in the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface. When the nano flower-shaped covalent organic framework material prepared by the method is used for treating water, uranium ions can quickly reach adsorption sites, and the material as an adsorbent is higher in stability and higher in adsorption selectivity.

The invention discloses a preparation method of a metal doped type hydroxyapatite nanoflower. The method specifically comprises the following steps: dispersing a calcium source and soluble metal salt into water, adding acid phosphate, urea and L-histidine, uniformly mixing, carrying out a hydrothermal reaction, mechanically stirring, filtering, washing, and drying a hydrothermal system precipitate to obtain the corresponding metal-doped hydroxyapatite nanoflower. Compared with the prior art, the metal-doped hydroxyapatite nanoflower prepared by the preparation method disclosed by the invention is directly assembled by nanosheets, and a single metal type can be doped in a customized manner. According to the method, water is used as a unique solvent, the use of an organic solvent is avoided, the pH does not need to be adjusted in advance, the technological process is simple, operation is convenient, equipment investment is small, and the method is suitable for industrial production.

The invention discloses a preparation method of an aluminum silicate-based nanoflower porous material, the prepared product presents a special nanoflower-shaped morphology, has fibrous open pore channels, and has the characteristics of highly open space, effective utilization of active sites and the like, aluminum salt, TEOS (tetraethyl orthosilicate) and the like are adopted as raw materials, and the aluminum silicate-based nanoflower porous material is prepared. A novel catalyst carrier material with a nano flower-shaped structure is prepared by a hydrothermal method. Due to the large pore volume between the nano petals and an excellent directly reachable interface structure, various catalytic active sites can be well dispersed on the surfaces of the petal structures. The preparation process is simple and controllable, and the obtained product is rich in hole pattern, high in specific surface area and convenient for industrial preparation. Meanwhile, the obtained product is convenient for further processing and preparation of a catalyst with extremely excellent performance.

The invention discloses a double-morphology boron-containing Zn / Cu metal organic framework composite material as well as preparation and application thereof, and belongs to the technical field of fine chemical engineering. The double-morphology boron-containing Zn / Cu metal organic framework composite material is prepared through a one-pot hydrothermal reaction, and the double morphology comprises a three-dimensional nanoflower structure and a three-dimensional rod / columnar structure. Specifically, by adjusting the molar ratio of Zn to Cu in the coordination process with corresponding ligands, when the molar ratio of Zn to Cu reaches 1: 1, the original single nanoflower structure can generate a new three-dimensional rod / columnar structure, so that two composite forms are formed. The double-morphology boron-containing Zn / Cu metal organic framework composite material shows high activity and high selectivity when being used for two key reactions of electrochemical hydrogenation reduction and electrochemical oxidation of furfural.

The invention is suitable for the technical field of semiconductor material synthesis, and provides a preparation method of a three-dimensional semiconductor GaN nanoflower material, according to the method, a solvothermal method is utilized to synthesize the three-dimensional tunable GaN nanoflower material which is stable in crystal structure, low in sample cost and environment-friendly, and the tunable GaN nanoflower material is obtained by controlling the reaction time. The obtained three-dimensional GaN nanoflower has a relatively large specific surface area and abundant active sites. In addition, the GaN nanoflower material increases the specific surface area, improves the electron transmission performance, improves the catalytic performance and enhances the light absorption performance, and shows remarkable performance advantages in the fields of photocatalysis, electrocatalysis, gas sensors, optoelectronic devices and the like.

The invention discloses a hexagonal bismuth phosphate modified indium zinc sulfide (ZIS / HBIP) composite catalyst and a preparation method thereof. The catalyst is applied to photocatalytic synthesis of HO. The indium zinc sulfide (ZIS) nano flower balls in the catalyst are prepared by a hydrothermal method, and then hexagonal bismuth phosphate (HBIP) is loaded on the surface of the ZIS by a room temperature precipitation method to obtain a series of ZIS / HBIP composite catalysts. ZIS and HBIP can effectively improve photo-induced electron-hole separation and transmission, improve the selectivity of direct two-electron oxygen reduction reaction (2eORR) and inhibit HO decomposition. Experimental results show that when the theoretical dosage of HBIP is 0.01 mmol, the prepared ZIS / HBIP 0.01 has the optimal photocatalytic activity, the HO yield within 1 h can reach about 955 [mu] mol.g.h, and efficient synthesis of HO in pure water is achieved.

The invention discloses an ordered and disordered structure integrated nanoflower SERS (Surface Enhanced Raman Scattering) chip and a preparation method thereof, and relates to the field of surface enhanced Raman scattering chip detection. The chip comprises a substrate layer, an ordered periodic nanostructure array metal layer, a disordered nanosheet metal layer and a nanoflower structure metal layer, the nanoflower structure metal layer and the disordered nanosheet metal layer are attached to the surface of the ordered periodic nanostructure array metal layer; the ordered periodic nanostructure array metal layer is attached to the surface of the substrate layer. The nanostructures of the nanoflower structure metal layer units comprise nanosheets, nanowires, nanospheres and the like. The preparation method comprises the steps of nanoimprinting, oxygen plasma etching, magnetron sputtering, electrochemical deposition and the like. The detection repeatability is guaranteed through an ordered structure, the hot spot density and strength are improved through a disordered structure, the preparation process is stable and reliable, the chip with the uniform surface and high repeatability can be produced, and the chip has wide application prospects in the fields of biochemical sensing, food safety, environment monitoring and the like.

The invention belongs to the technical field of degradation of persistent fluorine-containing pollutants, and particularly relates to an electrostatic self-assembly 3D nano flower-shaped Z-type heterojunction photocatalyst and a preparation method thereof. The problem that perfluorooctanoic acid formed by a common technology is difficult to degrade is solved. Comprising the following steps: dissolving an iron source and PVP (Polyvinyl Pyrrolidone) into a mixed solvent to form a solution A, dissolving an organic ligand into the mixed solvent to form a solution B, mixing the two solutions, putting the mixed solution into a polytetrafluoroethylene lining container, carrying out hydrothermal reaction, cooling to room temperature, centrifuging, washing and drying to obtain the Fe-BTC catalyst, respectively dissolving a bismuth source and a chlorine source into ethylene glycol, and carrying out hydrothermal reaction to obtain the Fe-BTC catalyst. And then mixing the two solutions, carrying out stirring ultrasonic treatment, adding a Fe-BTC catalyst, carrying out ultrasonic stirring, transferring the mixture into a polytetrafluoroethylene lining container, carrying out hydrothermal reaction, and after the temperature is reduced to room temperature, centrifugally collecting solids, washing and drying to obtain the composite photocatalyst. The composite catalyst prepared by the invention can efficiently degrade perfluorooctanoic acid under illumination.

The invention discloses a Pt-based composite nanoparticle catalyst as well as a preparation method and application thereof, the catalyst comprises a V5O12 carrier and Pt nanoparticles loaded on the carrier, and the V5O12 is of a multi-stage layered nanoflower structure; the catalyst is obtained by in-situ generation of Pt nanoparticles on a V5O12 carrier. According to the catalyst disclosed by the invention, the superfine Pt nano-particles are loaded on the metal oxide V5O12, so that the activity and the stability of the catalyst are improved; in addition, the preparation method is simple to operate and low in cost, and large-scale production can be realized.

The invention relates to the technical field of new materials, in particular to a piezoelectric catalytic polyvinylidene fluoride material and a preparation method and application thereof, and the preparation method comprises the steps of obtaining nanoflower ZnO and obtaining a piezoelectric catalytic film. The nanoflower ZnO and the carbon nanotubes are used as fillers of the PVDF film, so that the contact area between the surface of a film material and target pollutants subjected to piezoelectric degradation is effectively increased, and the supply of piezoelectric charges and the charge transmission efficiency in a PVDF matrix are increased, thereby improving the capability and efficiency of degrading organic pollutants. Organic pollutants are directly degraded through piezoelectric catalysis under low-frequency water flow; meanwhile, the thin film material structure is easy to recycle and shows good cycling stability, the problem of secondary pollution generally related to inorganic piezoelectric powder is solved, the limitation of a traditional piezoelectric catalysis system is overcome, and an extensible and environment-friendly method is provided for organic pollutant degradation.

The invention relates to a nickel-iron layered double hydroxide with flaky nanoflower morphology and a preparation method and application thereof. The preparation method of the nickel-iron layered double hydroxide comprises the following steps: S1, dissolving nickel acetate in an organic solvent or a mixed solvent of the organic solvent and water to prepare a first solution; dissolving ferrite in water to prepare a second solution; and S2, uniformly mixing the first solution and the second solution to obtain a mixed solution, and standing and aging to obtain the ferronickel layered double hydroxide. The method is simple to operate, mild in reaction condition, low in equipment cost and green and environment-friendly in synthesis process; the NiFe-LDH prepared by the method is of a three-dimensional nanoflower structure, is uniform in morphology, has a high specific surface area, can provide more active sites, shows excellent electro-catalytic performance when being used as a catalyst for oxygen evolution by electrolysis of water, and has a wide application prospect in the fields of electrochemical energy storage, electro-catalysis, catalytic oxidation and the like.

The invention relates to synthesis of a novel nano material and application of the nano material in the field of supercapacitors, and discloses preparation and application of island-shaped nickel-vanadium-iron phosphide in-situ decoration nickel-vanadium-iron metal organic framework nano flower / foamed nickel. The invention aims to solve the problem that the existing super capacitor is insufficient in specific capacitance and energy density. The preparation method mainly comprises the following steps: 1, preparing nickel-vanadium-iron metal organic framework nanoflower / foamed nickel (NiVFe-MOF / NF) by a solvothermal method; and 2, preparing the heterojunction (NiVFe-P coated NiVFe-MOF / NF) of the nickel-vanadium-iron metal organic framework decorated by the island-shaped nickel-vanadium-iron phosphide (NiVFe-P) by an in-situ partial phosphorization method. The preparation method has the advantages of simplicity, low cost, high yield and the like. Due to the controllable heterojunction and abundant heterogeneous interfaces, the material shows excellent electrochemical characteristics. The specific capacitance is 2368.5 C g <-1 > when the specific capacitance is 1A g <-1 >, and the capacitance retention rate is still 90% after 10,000 cycles at the specific capacitance of 10A g <-1 >. In a two-electrode system, when the power density is 1.16 W kg <-1 >, the energy density of NiVFe-P-coated NiVFe-MOF / NF / / activated carbon / NF can reach 109.4 Wh kg <-1 >.

The invention belongs to the field of nano sensors, and discloses an electrochemical sensor based on a porous silicon-platinum nanoflower-DNA composite material and a preparation method and application thereof. A porous silicon layer is prepared on a polished surface of a silicon wafer, then platinum nanoflowers and a T-rich sulfhydrylation DNA probe are modified, a metal film is plated on the other surface of the silicon wafer, and the electrochemical sensor is prepared and applied to melamine detection. The DNA probe can adsorb melamine on the surface of a material through a hydrogen bond and generate current response linearly related to the concentration of the melamine; hydroxyl on the surface of the porous silicon can enhance the adsorption effect on melamine; the platinum nanomaterial with the flower-shaped structure can enhance the sensitivity of the sensor; in addition, negative charges carried on the surface of the porous silicon and common coexisting substances of melamine have an electrostatic repulsion effect, so that the sensor has good selectivity. The high-performance nano sensor provides a novel method with practicability for on-site rapid detection of melamine.

The invention discloses a biological patch material with dry-state adhesion and wet-state easy stripping characteristics and application thereof, and belongs to the field of biological medicine. The biological patch material is prepared according to the following steps: by taking water-soluble protein as a template and copper ions in water-soluble copper salt as a metal coordination center, carrying out self-assembly on the template and drug molecules with phenolic hydroxyl structures to form nanoflowers; mixing the acrylamide, the sodium alginate, the water-soluble calcium salt and the nano-flowers to obtain the water-soluble calcium-based water-soluble nano-flower fertilizer. The biological patch material is adhered to the skin through electrostatic interaction, covalent bonds, physical interpenetration and topological tissues. The patch has skin adhesion in a dry state, so that the patch is convenient to fix; after the patch is in contact with burnt skin, the patch absorbs water and swells, the adhesive force is obviously reduced, and painless, easy and non-invasive stripping is realized. In addition, the patch has immunoregulation performance, can prevent stimulation and anaphylaxis caused by long-term contact with the skin, and promotes burn repair.

The invention relates to the technical field of gas sensors for detecting H2S at room temperature, in particular to a preparation method of a high-sensitivity MoSe2-based gas sensitive material for detecting H2S at room temperature. The high-sensitivity MoSe2-based gas sensitive material for detecting H2S at room temperature is prepared by synthesizing MoSe2 nanoflowers by adopting a hydrothermal method and uniformly loading In2O3 nanoparticles on the surfaces of the MoSe2 nanoflowers by adopting a mechanical mixing method. The preparation method is simple and convenient in process and low in cost, the MoSe2 / In2O3 composite material prepared by the method has a relatively high specific surface area, and an II-type p-n heterojunction interface formed by the composite material effectively promotes separation and migration of current carriers. The response to 0.05 ppm H2S, 0.1 ppm H2S, 0.25 ppm H2S, 0.5 ppm H2S and 1ppm H2S at room temperature (the gas response is calculated according to the formula R = (Rg-Ra) / Ra) is 1.37, 1.47, 1.85, 2.74 and 4.82 respectively, the response is far better than that of an existing pure-phase MoSe2 gas sensitive material, and the working temperature is lower than that of an In2O3 pure-phase material. The research provides an effective method for constructing a gas sensitive material with a large specific surface area and II type p-n heterojunction, and further promotes the development of a gas sensitive technology.

The invention belongs to the field of preparation of photocatalysts, and particularly relates to a Ni-CNZIS composite photocatalyst as well as a preparation method and application thereof. According to the composite catalyst, ZIS nanoflowers serve as a material core, the form and performance are regulated and controlled through citric acid and sodium hydroxide, CNZIS nanosheets are synthesized, Ni is deposited on the CNZIS nanosheets through a photodeposition method, and the photocatalytic performance of the Ni-CNZIS composite photocatalyst is improved. The photocatalyst is used for photocatalytic conversion of HMF to generate C12 products (DHMF and BHMF), and has high catalytic activity and high selectivity of BHMF while producing hydrogen.

The invention relates to the field of water electrolysis hydrogen production, in particular to a NiCoCrFeAl high-entropy alloy coating material and a preparation method and application thereof. The NiCoCrFeAl high-entropy alloy coating material comprises a stainless steel base body and a NiCoCrFeAl high-entropy alloy coating growing on the stainless steel base body, and the NiCoCrFeAl high-entropy alloy coating is prepared from the stainless steel base body, the NiCoCrFeAl high-entropy alloy coating material is of a nanoflower array structure, and the NiCoCrFeAl high-entropy alloy coating is obtained through in-situ growth on the surface of stainless steel with a FeOOH and NiOOH nanoflower structure. According to the method, the stainless steel is pretreated by adopting a strong oxidant, the surface of the stainless steel is oxidized into FeOOH and NiOOH with nanoflower structures by utilizing Ni and Fe elements of the stainless steel, the surface area of the electrode is effectively increased, and the nanostructure is beneficial to hydrogen removal and reduction of hydrogen evolution overpotential.

The invention discloses a selenium-doped Mn3O4 nanoflower as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing a solution; (2) precipitation reaction; (3) vacuum drying; and (4) low-temperature selenylation induction reaction. The preparation method comprises the following steps: firstly, preparing MnO2 nanoflowers by adopting a precipitation reaction, and then carrying out a low-temperature selenylation induction reaction on the MnO2 nanoflowers, so as to successfully synthesize the selenium-doped Mn3O4 nanoflower positive electrode material. Selenium doping not only can improve the conductivity of Mn3O4 and increase the active sites of the material, but also can improve the structural stability of the electrode in the charging and discharging process, and shows more excellent zinc storage performance. In addition, the synthesis method is low in cost, simple to operate and suitable for large-scale production, and has application potential.

The invention provides a preparation method of alpha, omega-diiodo perfluoroalkane, and belongs to the technical field of iodo perfluoroalkane synthesis. The preparation method disclosed by the invention comprises the following steps: under a protective atmosphere, enabling a nano flower type magnesium fluoride catalyst, 1, 2-diiodo tetrafluoroethane and tetrafluoroethylene to react, so as to obtain 1, 4-diiodo perfluorobutane and 1, 6-diiodo perfluorohexane. The nano flower type magnesium fluoride catalyst has high specific surface area and abundant coordination unsaturated sites, can effectively activate reactant molecule bonding sites, and avoids the problems of side reaction and catalyst deactivation caused by free radical paths; by optimizing the pore structure and reaction conditions of the catalyst, efficient synergistic conversion of IPF-2 and TFE can be realized, and the selectivity and yield of IPF-4 and IPF-6 are remarkably improved. The method provided by the invention has the advantages of mild conditions, safe operation, adjustable product distribution and the like, and meets the requirements of industrial production on high-selectivity fluorine-containing bifunctional compounds.

The invention provides a Ce / CuO nanoflower-nanowire heterogeneous electrocatalyst as well as a preparation method and application thereof, and belongs to the technical field of preparation of electrocatalytic materials. According to the preparation method disclosed by the invention, Ce modification is carried out on the CuO nanowires, so that the Ce / CuO nanoflower-nanowire heterogeneous electrocatalyst with a large number of oxygen vacancies is obtained; by doping Ce, more oxygen vacancies appear in the catalyst, and an electronic structure is optimized, so that adsorption of an intermediate is promoted; the catalyst is beneficial to activation and dissociation of interface water, can promote generation of active hydrogen and hydrogenation of reaction intermediates, has good application in the field of electro-catalysis nitrate reduction, and has good practicability.

The present invention relates to a nickel-iron layered double hydroxide having a flaky nanoflower morphology and its preparation method and application. The preparation method of the nickel-iron layered double hydroxide comprises the following steps: S1, dissolving nickel acetate in an organic solvent or a mixed solvent of an organic solvent and water to prepare a first solution; dissolving a ferrous salt in water to prepare a second solution; S2, mixing the first solution and the second solution to obtain a mixed solution, and obtaining the nickel-iron layered double hydroxide through standing and aging. The method is simple to operate, has mild reaction conditions, low equipment cost, and a green synthesis process; and the NiFe-LDH prepared by the above method presents a three-dimensional nanoflower structure with uniform morphology and high specific surface area, which can provide more active sites. It exhibits excellent electrocatalytic performance as a catalyst for electrolysis of water and oxygen evolution, and has broad application prospects in the fields of electrochemical energy storage, electrocatalysis, and catalytic oxidation.

The invention designs a preparation method of an electrochemical sensor for detecting acrylamide based on a Ce-MOF and AuPd nanoflower composite material. The advantages of large surface area and good stability of Ce-MOF are utilized to load a large amount of AuPd NFs, and the composite material Ce-MOF (at) AuPd NFs with high conductivity is obtained. The preparation method comprises the following steps: modifying an electrode by virtue of a physical adsorption effect, fixing a triple-helix molecular switch THMS on the electrode by virtue of a gold-sulfur bond and a palladium-sulfur bond, when acrylamide exists, combining acrylamide with an aptamer, forming DNAzyme by virtue of single-stranded CDNA1 and single-stranded CDNA2, and driving a DNA walker amplification strategy in the presence of Mg < 2 + >, so that a hairpin HP1 is sheared, and a large amount of single-stranded S1 is obtained. According to the method, S1, signal tags combined on an electrode are reduced and signals are reduced by destroying a triple helix structure, so that acrylamide detection is realized. The electrochemical biosensor constructed by the method disclosed by the invention has relatively high specificity and relatively high sensitivity.