621 results about "Nano catalyst" patented technology

The invention discloses a modified graphite felt electrode for an all-vanadium redox flow battery and a preparation method of the modified graphite felt electrode, and belongs to the technical field of redox flow battery electrode materials. The preparation method comprises the following steps: graphite felt electrochemical oxidation etching treatment; self-assembling a conductive layer on the oxidized and etched graphite felt to obtain the graphite felt attached with the conductive layer; and loading a metal and nitrogen-doped carbon (M and NC) nano catalyst layer on the graphite felt attached with the conductive layer to obtain the modified graphite felt electrode. Various properties of the graphite felt are comprehensively improved through matrix treatment, structure change and load catalysis, mild electrochemical oxidation etching is adopted, a carbon fiber structure is protected, a self-assembled net-shaped conductive layer forms a stable conductive channel, the specific surface area is remarkably increased, a nitrogen-doped carbon shell is adopted to wrap metal nanodots to form an M-NC catalytic layer, and the specific surface area is remarkably increased. The catalyst layer is not easy to dissolve out, the capacity fading rate is obviously improved, the loading capacity of the catalyst layer on the reticular structure conducting layer with a larger specific surface area is larger, and meanwhile, the process is simple and low in cost.

The present invention relates to magnetic, catalytically active, and radiosensitizing nanoparticles (NanoXcats) and the method for their production. A method is disclosed for the production of functionalized greigite nanoparticles with a narrowband size distribution (10-30 nm) for use in multimodal cancer therapy. NanoXcats are superparamagnetic Fe3S4 nanoparticles whose surfaces are equipped with polar functional groups. The surface structures of NanoXcats are suitable for conjugation with, or for covalent or electrostatic binding of, active substances, which may be cancer drugs, cell growth inhibitors, or NO donors. Due to the EPR effect, NanoXcats are preferentially internalized by tumor cells. The targeted accumulation of NanoXcats in tumor tissue is achieved by an external inhomogeneous magnetic field. NanoXcats exhibit enhanced catalytic activity in tumor cells.The catalytic activity of intracellular NanoXcats can be triggered, controlled, and enhanced by low-dose X-rays. Surface-bound drugs are additionally activated in tumor cells by the catalytic activity of NanoXcats. NanoXcats act as superoxide dismutase, nitric oxide synthase, and Fenton catalyst. They catalyze, for example, reactions of the superoxide anion radical to hydrogen peroxide, of L-arginine to NO, and of hydrogen peroxide to the hydroxyl radical.

The invention provides a NiCo double hydroxide self-supporting nano-catalyst as well as a preparation method and application thereof, and belongs to the field of nano composite materials. The preparation method of the NiCo double hydroxide self-supporting nano-catalyst is characterized by comprising the following steps: firstly, adding cobalt salt and nickel salt into a solvent, performing ultrasonic treatment to completely dissolve the two metal salts to obtain a metal salt solution, and then assembling a working electrode, a counter electrode and a reference electrode in the metal salt solution to obtain a three-electrode device, and finally, adjusting corresponding parameters in an electrochemical workstation, and carrying out a self-supporting deposition experiment of Ni and Co double-metal hydroxides on the three-electrode device in the electrochemical workstation to obtain the NiCo double-metal hydroxide self-supporting nano-catalyst material with a typical scaly structure and excellent performance. According to the preparation method of the NiCo double-metal hydroxide self-supporting nano-catalyst material, product treatment is convenient and fast, and the process is simple.

The invention discloses a nano-carbon supported ruthenium cluster nano-catalyst as well as a preparation method and application thereof. According to the present invention, the synthesis process of the catalyst is simple and easy to perform, the reaction process is controllable, the nanocarbon with characteristics of rich defects and large specific surface area is adopted as the carrier, the ruthenium cluster is loaded on the surface of the nanocarbon, and the nanometer catalyst with characteristics of high specific surface area and high atom utilization rate is synthesized. The catalyst can catalyze persulfate (PDS) to generate products with strong oxidation activity, namely sulfate free radicals (SO4.-), hydroxyl free radicals (. OH) and singlet oxygen (1O2), so that effective inactivation of bacteria is realized. In the invention, the reaction of activating the persulfate to disinfect by the catalyst is carried out at room temperature under neutral conditions, and in a mild reaction environment, the nanocarbon-loaded ruthenium cluster nanocatalyst shows good capability of catalyzing the persulfate to inactivate bacteria, and has huge potential in practical application of water disinfection.

The invention discloses a preparation method and application of a mesoporous confinement nickel-based methane dry reforming catalyst, and belongs to the field of nano-catalyst preparation.According to the method, on the basis of a traditional impregnation method, a small amount of ethylene glycol is added to serve as a surface active agent, high-temperature-resistant SBA-15 with ordered mesoporous channels serves as a carrier, metal nitrate serves as a precursor, and the mesoporous confinement nickel-based methane dry reforming catalyst is prepared through a hydrothermal method; in the high-speed stirring evaporation process, along with evaporation of water, the surface tension of the mixed liquid is gradually reduced, and meanwhile, the viscosity of the solution is increased, so that the metal nitrate precursor can be conveyed into an SBA-15 pore channel and is anchored in the pore channel under the action of high viscosity. And the methane dry reforming catalyst with high activity and high stability is obtained through drying, calcining and hydrogen reduction. The catalyst has the advantages of simple preparation process, low cost, high catalytic efficiency, high stability and the like.

The invention relates to the technical field of electrochemical sensors, and provides a multi-channel electrochemical detection electrode, an electrochemical sensor and a detection method.The multi-channel electrochemical detection electrode comprises an electrode substrate and a plurality of working electrodes arranged on the electrode substrate; the surfaces of the plurality of working electrodes are respectively modified with different types of metal nano-catalysts to detect different gas components, and the surfaces of the working electrodes are covered with PDMS hydrophobic layers to form a hydrophilic / hydrophobic channel separation structure. The surfaces of a plurality of working electrodes are modified with different types of metal nano-catalysts and covered with PDMS hydrophobic layers to form a hydrophilic / hydrophobic channel separation structure, and the multi-channel electrochemical detection electrode separates gas molecules through hydrophilic / hydrophobic channels, so that the cross reaction can be inhibited, and the cross sensitivity can be reduced.

The invention discloses a core-shell structure Au-coated CeO2 nano-catalyst and a preparation method and application thereof, and belongs to the technical field of core-shell structure catalysts.The preparation method of the catalyst comprises the following steps that S1, a chloroauric acid solution and a low-concentration cerium chloride solution are added into deionized water and stirred and mixed at the temperature of 5 DEG C, then an ammonia water solution is rapidly added, stirring and mixing are conducted at the temperature of 5 DEG C, and a mixed solution is obtained; quickly adding a high-concentration cerium chloride solution, and continuously stirring for 30 minutes to obtain a mixed solution; s2, carrying out centrifugal separation on the mixed solution to retain a precipitate, washing the precipitate with deionized water and absolute ethyl alcohol, and carrying out freeze drying to obtain a catalyst precursor; s3, performing cleaning treatment and annealing treatment on the catalyst precursor, and cooling to room temperature to obtain a core-shell structure Au-coated CeO2 nano-catalyst; when the catalyst is applied to catalytic synthesis of the BODIPY fluorescent dye, excellent catalytic performance and recycling performance are shown, and the yield of the BODIPY fluorescent dye can be remarkably increased.

The invention discloses a high-porosity organic salt framework confinement nano-metal hydrogen storage material and a preparation method thereof, and belongs to the field of new energy materials. The material takes a carboxylic acid organic salt framework (POS-1) as a carrier, the specific surface area of the material is 1520 m < 2 > / g, the pore size distribution is 1.8-2.5 nm, nano Mg / Ni particles (the average particle size is 3.2 + / -0.5 nm) are confined in pores through a gradient loading and in-situ reduction technology, and an atomic layer deposition (ALD) is adopted to modify a Pd nano catalyst (the loading capacity is 0.48 wt%). The reversible hydrogen storage capacity of the material at room temperature reaches 5.8 wt%, the hydrogen desorption temperature is lower than 80 DEG C, and the capacity retention ratio is larger than or equal to 92% after 100 times of circulation. The preparation method comprises the steps of organic salt framework synthesis, metal precursor gradient loading, low-temperature reduction (250 DEG C), hydrogenation activation and the like, the process is simple and controllable, and the catalyst is suitable for scenes such as a vehicle-mounted hydrogen storage system.

The invention discloses a method for preparing furfuryl amine by reductive amination of biomass-based furfural, which comprises the following steps: adding furfural, a catalyst, ammonia water and a solvent into a closed reaction kettle in proportion, replacing air in the reaction kettle with high-purity hydrogen, and reacting in an oil bath pan for a period of time to obtain a target product furfuryl amine, the nano-catalyst provided by the invention is a nitrogen-doped porous hollow carbon sphere loaded nano bimetallic catalyst, takes noble metal and non-noble metal as a metal active center together, and has adjustability of macroscopic size and microstructure at the same time; the method has the advantages of simple reaction system, mild conditions, no pollution to the environment, high efficiency, energy conservation, low cost, few byproducts, high yield, high selectivity and the like, the furfural is efficiently converted into furfuryl amine at low temperature and low pressure within a short time, the used heterogeneous catalyst is stable and easy to recover, a new thought and direction are provided for enterprise production and scientific research, and the method is suitable for industrial production. The method has great significance on development and utilization of biomass-based furfural.

The invention discloses a single-walled carbon nanotube preparation method and system based on a molten metal reaction bed. The preparation method comprises the following steps: forming a molten metal reaction bed, contacting a catalyst and a promoter with the molten metal reaction bed, and exciting under the thermal action of the molten metal reaction bed to form nano catalyst particles; the nano-catalyst particles are combined with a carbon source to form a single-walled carbon nanotube. According to the technical scheme provided by the invention, the formation of the nano-catalyst is realized through the molten metal reaction bed, a high-temperature condition can be provided for the growth of the single-walled carbon nanotubes, the high-quality single-walled carbon nanotubes can be obtained, and the molten liquid metal reaction bed can dissolve and absorb redundant catalyst particles, so that the yield of the single-walled carbon nanotubes is improved. And the purity of the single-walled carbon nanotube can be improved.

The invention relates to the technical field of coatings, and particularly discloses a high-wear-resistance and high-toughness polyurethane floor coating and a preparation method thereof. According to the technical key points, the high-wear-resistance and high-toughness polyurethane floor coating is prepared from the following components in parts by weight: 100 parts of cross-linked polyurethane matrix resin, 1 to 3 parts of nano ZnO (at) MCM-41 catalyst, 10 to 15 parts of core-shell microsphere powder filler, 5 to 10 parts of fiber filler, 15 to 20 parts of reactive diluent and 1 to 3 parts of photoinitiator, the cross-linked polyurethane matrix resin is composed of a disulfide bond-containing polyurethane prepolymer and an ultraviolet curing acrylate end group; the core-shell microsphere powder filler is prepared by taking a polyurethane-acrylate copolymer as a shell layer and diamond and silicon carbide composite particles as a core layer, and the particle size of the core-shell microsphere powder filler is 200-500nm. The polyurethane floor coating prepared in the invention has excellent performance, and the coating has high wear resistance and high toughness.

The invention provides an efficient chloramphenicol degradation method based on Co-Cu-carbon composite nano-catalyst activated peroxymonosulfate, which comprises the following steps: regulating the Co / Cu molar ratio in a bimetal organic framework precursor, and performing pyrolysis to prepare the Co-Cu-carbon composite catalyst with an optimized pore structure, graphitization degree and metal dispersity; peroxymonosulfate is activated by utilizing the synergistic effect of Co / Co and Cu / Cu redox pairs to generate sulfate free radicals, hydroxyl free radicals, singlet oxygen and superoxide free radicals, and direct oxidative degradation of chloramphenicol is promoted by taking a catalyst as an electron transfer bridge; the method realizes rapid and efficient removal of chloramphenicol, high mineralization rate, excellent cycle stability and strong anti-interference capability, and solves the technical problems of low removal efficiency, high cost and easy secondary pollution in the prior art.

According to the method for preparing the synthesis gas through the rare earth modified all-solid-state electrolytic tank, rare earth oxide particles are anchored on a porous SFM framework by dipping the rare earth oxide nano catalyst, so that the catalytic activity of the material is greatly improved, active sites participating in the reaction are increased, the electrochemical reduction reaction is facilitated, and the yield of the synthesis gas is increased. And continuous and controllable preparation of components of the synthesis gas is realized. According to the invention, the preparation process of a traditional dipping mode is simplified, the problem of cathode stability of the solid oxide electrolytic tank during high-temperature operation is solved, meanwhile, rare earth resources are reasonably utilized, the production cost is reduced, and the defects of carbon deposition during traditional cathode operation, need of adding a protective atmosphere to prevent oxidation and the like are avoided.

The invention discloses preparation of a layered mesoporous Pd-Cu nano-catalyst and a method for preparing glycollic acid from PET hydrolysate through electro-oxidation under environmental conditions, and belongs to the technical field of catalysts. The preparation method comprises the following steps: dissolving CTAB (Cetyltrimethyl Ammonium Bromide) serving as a surfactant in a cosolvent of water and TMB (Tetramethylbenzidine), sequentially adding NH4PdCl4 and Cu (NO3) 2.3 H2O serving as metal precursors into a reaction solution, and finally synthesizing the layered mesoporous Pd-Cu by virtue of a reduction effect of sodium borohydride and an in-situ nucleation and adhesion method. Continuous electro-catalysis is carried out in a pulse mode, selective desorption of GA is dynamically accelerated, and new active sites of a metal catalyst are exposed. The electric pulse catalysis can promote the desorption of the product, prevent poisoning, and further improve the stability and selectivity of the catalyst. The method shows excellent glycollic acid Faraday efficiency, high generation rate and excellent cycle stability under a wide potential window, 20 times of electro-catalysis PET upgrading cycles are achieved, and upgrading utilization of PET waste and efficient generation of glycollic acid are achieved.

The invention discloses a method and a device for preparing a single-walled carbon nanotube based on the host-guest interaction of pillararene and metallocene. The method comprises the following steps: enabling a host compound and a guest compound to form a host-guest complex; the host compound comprises pillararene or a derivative thereof, and the guest compound comprises a cyclopentadienyl metal complex or a derivative thereof; the method comprises the following steps: reacting a mixed reaction system containing a host-guest compound and a polymerization inhibitor at a high temperature to obtain nano-scale catalyst particles; and contacting the nano-catalyst particles with a carbon source, and decomposing and growing the carbon source on the surfaces of the nano-catalyst particles to prepare the single-walled carbon nanotubes. The method disclosed by the invention is mainly based on the strong inclusion behavior of the host compound and the guest compound, and by utilizing the compatibility of the host compound, the solubility of the metallocene in an organic solvent is effectively improved, the decomposition time of the metallocene at high temperature is prolonged, and the in-situ controllable preparation of nano-scale catalyst particles is achieved; and furthermore, the yield and the quality of the single-walled carbon nanotubes are improved.

The invention discloses a preparation method and application of a CuO / MgO nano-catalyst, and relates to a preparation method and application of a nano-catalyst. The invention aims to solve the problem that in the existing electrocatalytic CO2 reduction technology, under high current density, an oxide catalyst is easy to generate various reduction products, and high C2H4 selectivity is difficult to achieve. The method comprises the following steps: 1, preparing a precursor solution; 2, hydrothermal reaction; and 3, roasting. According to the application, the CuO / MgO nano-catalyst is used as a raw material for preparing a gas diffusion electrode and is used for electrocatalytic CO2 reduction. The preparation method is used for preparation and application of the CuO / MgO nano-catalyst.

The invention relates to a preparation method of a nano-catalyst based on a bimetallic organic framework material, and a product and application thereof, the preparation method comprises the following steps: (1) mixing 1, 4-terephthalic acid and N, N-dimethylformamide to obtain a solution A, mixing the solution A with formic acid, ceric ammonium nitrate and zirconyl nitrate to synthesize a bimetallic organic framework material Ce / Zr-UiO-66; and (2) carrying out impregnation and reduction on a metal salt precursor to obtain the nano-catalyst based on the bimetallic organic framework material. According to the method disclosed by the invention, the Zr site part is replaced by Ce in the Zr6O8 cluster at the UiO-66 node through one-pot synthesis, and the anchoring of the ultra-small nano metal is realized; the catalyst realizes catalysis of carbon dioxide hydrogenation methanation under mild conditions, and shows the advantages of high methane selectivity, high conversion rate and long-time stability.

Six-membered high-entropy foam for hydrogen production by water splitting and preparation method are provided. The foam consists of Ni, Fe, Cu, Co, Mo, and Pt, comprising 10 at %-25 at % of Ni, 10 at %-25 at % of Fe, 10 at %-25 at % of Cu, 10 at %-25 at % of Co, 10 at %-25 at % of Mo, and 10 at %-25 at % of Pt. Catalyst loading of the foam can reach a range of 0.8 mg / cm2-3.2 mg / cm2, which is much higher than the effective catalyst loading of most nano-catalysts. When used as catalyst for hydrogen production by water splitting, the hydrogen evolution overpotential of the surface of the six-membered high-entropy foam is within a range of 36 mV-60 mV, and the foam operates stably at industrial-level current density (500 mA / cm2). The preparation method does not require harsh environment such as high temperature or high vacuum, making the method simple and easy to implement, with low-cost raw materials.

The invention discloses a residual oil derived carbon supported Pt-Co-Au intermetallic compound as well as a preparation method and application thereof. According to the preparation method, residual oil is used as a carbon source, nitrogen-doped petroleum vacuum residual oil porous carbon is synthesized through a template method and nitrogen doping modification, and the high-dispersion intermetallic compound composite material Pt-Co-Au / NPPC is prepared with the porous carbon material as a carrier through an impregnation reduction method. In the catalyst, the total metal loading capacity is 30 to 50 percent by weight, the Pt loading capacity is 26 to 41 percent by weight, the Co loading capacity is 3.8 to 7 percent by weight, and the Au loading capacity is 0.2 to 2 percent by weight. The residual oil derived carbon supported Pt-Co-Au composite material nano catalyst prepared by the invention has efficient oxygen reduction (ORR) catalytic activity, and the synthesized catalyst has the characteristic of small size. The small size can effectively improve the utilization rate of Pt atoms, and the doping of Au can optimize the electronic structure of surface Pt, so that the ORR activity is improved. The fuel cell membrane electrode test peak power density of the prepared catalyst under the hydrogen-air condition reaches 1.12 W / cm < 2 >, the synthesis steps are simple, and the catalyst has good application prospects.

The invention belongs to the technical field of hydrogen storage material preparation, and specifically relates to a magnesium-based hydrogen storage composite material based on Ti-MOF and a preparation method thereof. A Ti source is added to a mixed solvent of ethanol and toluene to obtain a first solution; tetrabutylammonium chloride is added to ethanol to obtain a second solution; trimesic acid is added to a mixed solvent of ethanol and toluene, a pH regulator is added to obtain a third solution, the second solution is dripped into the first solution to obtain a fourth solution; under ultrasonic stirring conditions, the fourth solution is dripped into the third solution to obtain Ti-MOF, the Ti-MOF is mixed with spherical MgH2 powder to obtain a magnesium-based hydrogen storage composite material based on Ti-MOF. The invention introduces a multifunctional Ti-MOF additive by a simple method, and simultaneously realizes the multi-functional effects of a crushing agent, a nanocatalyst and an agglomeration inhibitor.

The invention discloses a preparation method of a nickel-based bimetallic multifunctional catalyst, which comprises the following steps: firstly, carrying out simple thiocyanate bridging coordination reaction to obtain a thiocyanate bridging complex precursor DMG-SCN-NiCo-Tu, and then carrying out high-temperature calcination to obtain a nickel-cobalt oxide nano catalyst NiCoO. The nickel-cobalt oxide nano catalyst NiCoO is a high-activity nickel-based bimetallic multifunctional catalyst. The preparation method is simple, dimethylglyoxime DMG and nickel-cobalt bimetallic coordination is achieved, meanwhile, the catalytic activity of the nickel-based catalyst is enhanced through introduction of the second metal Co, the prepared nickel-based bimetallic multifunctional catalyst has the large specific surface area and rich reaction active sites, the catalytic activity of the catalyst is remarkably enhanced, and the catalyst has the good application prospect. The problems of low electro-catalysis reaction activity and poor selectivity of a nickel-based single metal catalyst are solved, and the nickel-based single metal catalyst can be used as a catalyst for electro-catalysis nitrate reduction and urea oxidation.

The invention relates to a porphyrin-based iron metal organic framework (Fe-TCPP) catalyst for improving photoresponsiveness, which is characterized in that the Fe-TCPP nano catalyst is prepared by using an iron source and meso-tetra (4-carboxyphenyl) porphin (TCPP) as precursors through a simple solvothermal method, assisting coordination by virtue of polyvinylpyrrolidone (PVP), performing sealed reaction after ultrasonic dispersion, and preparing the Fe-TCPP nano catalyst. A purple suspension is obtained. And centrifuging, washing and drying to obtain the nano rod-shaped Fe-TCPP metal organic framework material. The Fe-TCPP catalyst prepared by the preparation method disclosed by the invention has a regular crystal structure and good dispersity, and can be stably coordinated to form a Fe-O cluster structure. The effective introduction of the TCPP enhances the charge transfer (LCCT) capability from the ligand to the metal cluster, effectively promotes the Fe (III) / Fe (II) circulation, and improves the photocatalysis-ozonation catalytic efficiency. The catalyst has the advantages of high thermal stability, less metal ion dissolution, good cycle performance and the like, and has wide application potential in the field of water treatment.

The invention provides an AgPt bimetallic coated Ag nano-material based on rGO negative charge regulation and control, and a preparation method of the Ag nano-material comprises the following steps: adding a silver acetate solution into a graphene oxide aqueous solution, sequentially adding distilled water, ethylene glycol, methyl pyrrolidone and trisodium citrate, uniformly stirring, and carrying out a hydrothermal reaction; cooling, centrifuging, cleaning with a mixed solution of water and ethanol, centrifuging again, and repeatedly cleaning and centrifuging for multiple times to obtain a reduced graphene oxide loaded silver nano catalyst rGO / Ag; the preparation method comprises the following steps: dispersing rGO / Ag in an ethanol solution, adding potassium chloroplatinate, carrying out a stirring reaction, carrying out centrifugation, carrying out washing with a mixed solution of water and ethanol, carrying out centrifugation again, and carrying out repeated washing and centrifugation for many times so as to obtain a reduced graphene oxide loaded platinum-silver metal coated silver nano-catalyst rGO / Ag (at) AgPt; wherein the molar ratio of Ag to Pt is (10: 1)-(6: 1). The catalyst has excellent catalytic performance on gallic acid, and is high in sensitivity, wide in linear range and suitable for electrochemical detection of gallic acid.

A general method for synthesizing a series of novel amorphous-crystalline palladium (Pd) -based heterophase nanocatalysts for various promising electrocatalytic applications. The synthesized amorphous-crystalline Pd-PdAu core-island nanocatalyst exhibits high activity, fast reaction kinetics, and excellent long-term catalytic stability toward glycerol oxidation reaction (GOR). Remarkably, the main product of glycerol catalyzed by amorphous-crystalline Pd-PdAu core-island heterostructure is glyceric acid, which possesses the highest commercial value among all the GOR products. The one-pot synthesized amorphous-crystalline Pd-PdPt Janus heterostructure shows remarkable catalytic activity, and fast reaction kinetics towards formic acid oxidation reaction (FOR) in alkaline solution in comparison with commercial Pt / C catalyst and amorphous Pd nanoparticles (NPs), which benefits the development of advanced electrocatalysts for practical applications. The synthesized amorphous-crystalline PdCu Janus heterostructures with bcc phase exhibit high activity, fast reaction kinetics, and excellent long-term catalytic stability for hydrogen evolution reaction (HER) and 5-hydroxymethylfurfural oxidation reaction (HMFOR), benefiting the development of advanced electrocatalysts for practical applications.

The invention discloses a non-noble metal catalyst, a preparation method thereof and application of the non-noble metal catalyst in preparation of acetic acid through methane oxidation, and belongs to the field of direct conversion and utilization of methane. The active metal of the catalyst is transition non-noble metal MnOx, and the carrier is an MFI type molecular sieve (ZSM-5). The catalyst can directly react methane and oxygen at low temperature to prepare acetic acid without adding a co-reducing agent and carbonylation raw materials (such as H2 and CO). The nanometer MnOx catalyst has the advantages of mild reaction conditions, high acetic acid selectivity and the like, the acetic acid selectivity can reach 81.8%, and the nanometer MnOx catalyst shows good recycling stability.

The utility model provides a copper-based nano-catalyst production device and relates to the technical field of copper-based nano-catalysts. The device comprises a supporting seat, a first-stage grinding cylinder, a second-stage grinding cylinder, a third-stage grinding cylinder and a material cylinder which are rotatably arranged above the supporting seat, are in a coaxial state and are sequentially communicated, and three baffles which are respectively arranged between the first-stage grinding cylinder and the second-stage grinding cylinder, between the second-stage grinding cylinder and the third-stage grinding cylinder and between the third-stage grinding cylinder and the material cylinder are arranged on the supporting seat. The two ends of the first-stage, second-stage and third-stage grinding cylinders and the material cylinder are rotationally connected with the corresponding baffles or supporting seats respectively; a first-stage screen is arranged on the baffle between the first-stage grinding cylinder and the second-stage grinding cylinder, a second-stage screen is arranged on the baffle between the second-stage grinding cylinder and the third-stage grinding cylinder, and a third-stage screen is arranged on the baffle between the third-stage grinding cylinder and the material cylinder. According to the utility model, three-stage grinding of materials is realized, the three-stage grinding is carried out in the same equipment, and material transfer is not needed among the multi-stage grinding, so that the grinding efficiency is greatly improved.

The invention belongs to the field of composite electrode preparation, and particularly relates to a high-current-carrying multiphase electrode with a vertical array type carbon nano catalyst layer and a controllable preparation method and application of the high-current-carrying multiphase electrode with the vertical array type carbon nano catalyst layer. The vertical array type carbon nano catalyst layers with different structural sizes (adjustable diameter and height) are synthesized by assisting a chemical vapor deposition method, and the multi-phase electrode with different functional layers is prepared on the carbon-based composite carrier through hot pressing. The high-current-carrying multi-phase electrode provided by the invention can realize the purpose of keeping high-electricity hydrogen peroxide production current efficiency under industrial-grade large current (300 mA / cm < 2 >). The composite electrode is mainly used for in-situ electrocatalytic production of hydrogen peroxide, and under the condition of industrial large current (300 mA / cm < 2 >), the concentration of hydrogen peroxide can reach 1-5 wt%, and the current efficiency can be maintained at 80-99%.

The present invention relates to a process for enhancing the photocatalytic degradation of perfluorooctanoic acid by a foam-supported nanocatalyst, which comprises the following steps: the first step is the collection and detection of industrial wastewater containing perfluorooctanoic acid; the second step is the pH adjustment of the industrial wastewater; and the third step is the process for photocatalytically degrading perfluorooctanoic acid. By effectively inhibiting the aggregation of the nanocatalyst during the reaction, the present invention can achieve the effective degradation of perfluorooctanoic acid (the degradation rate is 73.2-99.9%) and the recycling and reuse of the nanocatalyst.

The invention provides a sludge-based composite fuel as well as a preparation method and application thereof. The sludge-based composite fuel is prepared from the following raw materials in percentage: 40-60% of dewatered sludge, 20-40% of biomass powder, 3-8% of a nano catalyst and 2-5% of a composite adhesive. According to the sludge-based composite fuel, sludge, biomass and other fuels are mixed according to a certain proportion, the nano-catalyst is added to improve the combustion performance of the sludge fuel, the composite adhesive enhances the forming strength and waterproofness of the fuel, the component proportion and process conditions are optimized, and the sludge-based composite fuel is prepared. The problems that traditional sludge fuel is low in heat value, poor in combustion stability, high in pollutant emission and insufficient in forming storage performance are solved.

The invention discloses a preparation method of a controllable Co-Cu bimetallic oxide nano-catalyst, and the controllable Co-Cu bimetallic oxide nano-catalyst is applied to electro-catalysis, so that low-concentration nitrate pollutants in high-salinity wastewater can be efficiently removed. According to the preparation method, a constant-voltage electrodeposition method is utilized, the atomic-scale dispersed Co-Cu double-active-site catalyst is constructed on a foamed nickel substrate, and the prepared bimetallic Co-Cu active-site catalyst can remove low-concentration nitrate pollutants efficiently and highly selectively and is suitable for purification of nitrate wastewater with a wide pH range and different concentrations. The method is easy to operate, high in stability and good in electrocatalytic activity, and a reliable solution with practical application potential is provided for green low-carbon electrocatalytic purification of high-salt nitrate wastewater.