517 results about "Molybdate" patented technology

The invention relates to the technical field of total phosphorus detection, in particular to a method for determining total phosphorus in water, which comprises the following steps: 1) digestion treatment: adding an oxidant into a water sample to be detected, and then performing microwave digestion treatment to obtain digested water; a molybdate reagent is added into the digested water, then an improved ascorbic acid solution is added, a chromogenic reaction is completed at the set temperature, and the improved ascorbic acid solution is obtained by mixing an ascorbic acid solution and sodium ethylene diamine tetracetate; measuring the concentration: measuring the absorbance value of the obtained color development product by using a spectrophotometer and a long-optical-path cuvette; and drawing a standard curve: using a phosphorus standard solution as a quality control sample, adding a plurality of calibration points in a low-concentration interval of 0.0-0.1 mg / L, carrying out colorimetric determination, and establishing quadratic equation fitting according to absorbance and concentration so as to determine the total phosphorus content of the water sample to be detected, and the method has the advantages of high sensitivity and good accuracy in total phosphorus testing.

The invention relates to a composite reverse osmosis membrane acidic cleaning agent, a preparation method and a cleaning process thereof, and belongs to the technical field of environment-friendly water treatment. The cleaning agent comprises the following components in percentage by mass: 4-8% of inorganic acid, 20-40% of organic acid, 1-3% of a surfactant, 0.5-1% of a chelating agent, 0.5-1% of a compound corrosion inhibitor and the balance of deionized water. The composite corrosion inhibitor is formed by compounding 2-mercaptobenzothiazole and the like according to a specific mass ratio, the molecular weight of polyaspartic acid is 5000, and the molar ratio of Zn to Mo in the zinc-molybdate compound is 2: 1. The preparation method comprises the following four steps: firstly preparing a compound corrosion inhibitor premix, then preparing an acidic base solution, and then sequentially adding the components to finally obtain the cleaning solution. According to the cleaning process, a cleaning agent and deionized water are mixed, the membrane flux recovery rate is larger than or equal to 85% through cleaning of a specific process, the reverse osmosis membrane can be effectively cleaned, and the performance of the reverse osmosis membrane can be recovered.

The invention discloses a gadolinium boron molybdate magnetic refrigeration material with triangular magnetic resistance and a preparation method and application of the gadolinium boron molybdate magnetic refrigeration material. The chemical formula of the material is Gd2B2MoO9, the material belongs to a triclinic system, and the space group is P-1; the crystal structure has the characteristic that nearest rare earth Gd ions have magnetic resistance file; the material is prepared by a solid phase method or a sol-gel method; the magnetic phase change temperature of the material is 0.7-0.9 K, the material shows a remarkable magnetothermal effect at low temperature, the maximum isothermal magnetic entropy change values of the material are 30.0-35.0 J / kg.K and 51.0-55.0 J / kg.K respectively under the magnetic field change of 0-2T and 0-5T, and the material can be applied to low-temperature magnetic refrigeration. The gadolinium boron molybdate Gd2B2MoO9 material with triangular magnetoresistance provided by the invention has the advantages of low raw material price, simple process and lower equipment requirement, and is suitable for industrial production.

The invention relates to the technical field of electro-catalysis oxygen evolution, and particularly discloses a nickel-molybdenum foam composite oxygen evolution electro-catalysis material with high-valence nickel induced by molybdate radicals and a preparation method of the nickel-molybdenum foam composite oxygen evolution electro-catalysis material aiming at the problem that an existing oxygen evolution electro-catalysis material is insufficient in comprehensive performance or poor in performance stability. Soaking in a NaCl aqueous solution, and taking out; s2, mixing the nickel-molybdenum alloy foam with a K3 [Fe (CN) 6] aqueous solution, heating, and carrying out a hydrothermal reaction; and S3, finally, the nickel-molybdenum alloy foam is placed in the air or oxygen atmosphere and heated to 350-450 DEG C, heat preservation treatment is conducted for 2 h, and the nickel-molybdenum foam composite oxygen evolution electro-catalysis material is obtained. Molybdate anions are adopted as a sustainable induction source to be coupled with a NixOy / Fe3O4 heterogeneous interface, integrated construction is achieved on a nickel-molybdenum foam framework, and the nickel-molybdenum foam composite material has the advantages of being low in overpotential, high in stability, high in activity, high in binding force and long-term in durability and meanwhile being simple in process, easy to amplify on a large scale and the like.

The invention discloses a preparation method of chromium-free fingerprint-resistant liquid for an aluminized zinc plate, and relates to the technical field of metal surface treatment materials.The preparation method comprises the steps that a benzotriazole-cerium molybdate composite corrosion inhibition system is constructed, and multiple layers of adsorption films are formed through intermolecular pi-pi accumulation and rare earth ion coordination; meanwhile, a graphene oxide / nano silicon dioxide synergistic enhancement system is introduced, graphene sheet layers are directionally arranged to form a physical barrier, and micropores are filled with nano particles to improve compactness; and meanwhile, a lanthanide rare earth compound is adopted for modifying the flash-rust inhibitor, the stability of a passivation film on the metal surface is enhanced through the empty orbital characteristic of rare earth elements, the nanometer material gradient dispersion technology is combined with the ultrasonic-mechanical coupling dispersion technology, filler uniform distribution and interface bonding strengthening are achieved, and the fingerprint resistance, corrosion resistance and the like of the film layer are effectively guaranteed.

The invention provides a preparation method of a high-temperature-resistant graphite pipe for spectral analysis, and belongs to the technical field of spectral analysis, and the preparation method comprises the following steps: S1, preparing a high-purity graphite pipe matrix and carrying out surface activation treatment; s2, preparing composite sol, wherein the composite sol is formed by mixing silica sol, molybdate and phytic acid; s3, infiltrating the composite sol into the graphite matrix by adopting a vacuum-pressurization alternate impregnation process; s4, carrying out stepped heating heat treatment in an inert environment to form a SiC-MoSi composite reinforced phase; and S5, depositing a pyrolytic carbon layer on the inner wall of the graphite pipe. The silica sol, the molybdate and the phytic acid have a synergistic effect to form a SiC-MoSi composite phase, the phytic acid can prevent the molybdate from gathering and can promote the growth of SiC whiskers in heat treatment, so that the anti-oxidation temperature of the graphite pipe is increased, the temperature resistance and the heat stability of the graphite pipe are improved, and the anti-oxidation performance of the graphite pipe is improved. And finally, the use frequency of the graphite pipe is greatly increased.

The present invention relates to a Glycol based antifreeze liquid composition for combustion engines, electric vehicles, industrial and submersible motors. More particularly, the present invention relates to a Glycol based corrosion-inhibited antifreeze liquid composition, the said liquid composition comprises glycols, deionized water, alkali molybdate, alkali metal octoate or neodecanoate, rare-metal octoate or neodecanoate, dyes. The liquid composition of the present invention is environment-friendly, ready to use composition that will improve efficiency of combustion engines, industrial and submersible motors to the great extent and also provides excellent corrosion protection to the internal parts of the cooling system of combustion engines, electric vehicles and industrial and submersible motors.

The invention relates to a preparation method of an oxygen vacancy-rich bismuth molybdate / bismuth vanadate composite photo-anode and a product and application thereof, and belongs to the technical field of photoelectrocatalysis. The invention discloses a preparation method of an oxygen vacancy-rich bismuth molybdate / bismuth vanadate (Bi2Mo2O9 / BiVO4) composite photo-anode, which mainly comprises the following steps: immersing a fluorine ion-doped tin dioxide (FTO) conductive glass substrate into a Bi < 3 + > ion solution and an I <-> ion solution to form a bismuth oxyiodide (BiOI) film, dropwise adding a dimethyl sulfoxide solution of vanadyl acetylacetonate (VO (acac) 2), and putting into a muffle furnace to prepare the BiVO4 photo-anode. And then vertically immersing into a Bi < 3 + > ion solution and a Mo < 6 + > ion solution, and carrying out annealing treatment in an argon atmosphere to prepare the Bi2Mo2O9 / BiVO4 composite photoanode rich in oxygen vacancies. The Bi2Mo2O9 / BiVO4 material rich in oxygen vacancies is a metal oxide composite photo-anode, the photoelectrocatalysis efficiency can be improved, and hydrogen peroxide (H2O2) can be continuously generated in natural seawater through photoelectrocatalytic oxidation of water for a long time.

The invention provides an anodic oxidation passivation method of a neodymium-iron-boron permanent magnet zinc coating, which comprises the following steps of: performing electrochemical anodic oxidation by taking a neodymium-iron-boron permanent magnet with a zinc coating on the surface as an anode, a Pt sheet as a cathode and a passivation solution as an electrolyte, forming a passivation layer on the surface of the neodymium-iron-boron permanent magnet with the zinc coating on the surface, and cleaning and drying to obtain the neodymium-iron-boron permanent magnet with the zinc coating on the surface. A chromium-free passivation film is formed on the neodymium-iron-boron permanent magnet zinc coating, and passivation of the neodymium-iron-boron permanent magnet zinc coating is completed; the passivation solution is prepared from 10 g / L to 20 g / L of molybdate, 10 g / L to 15 g / L of ammonium fluozirconate, 1 g / L to 10 g / L of etidronic acid, 1 g / L to 10 g / L of sodium dihydrogen phosphate, 1 g / L to 10 g / L of nitric acid, 1 g / L to 10 g / L of phosphoric acid and the balance distilled water. According to the method disclosed by the invention, a complete, uniform and compact passivation film is formed on the surface of the zinc coating after passivation, the corrosion potential is improved while the corrosion current is effectively reduced, and the time for generating a rust spot in a salt spray test exceeds 72 hours.

The invention relates to the field of waste catalyst recovery, and discloses a method for recovering molybdenum from a waste hydrofining catalyst. The method comprises the following steps: (1) roasting the molybdenum-containing waste hydrofining catalyst in an inert atmosphere; (2) carrying out contact reaction on the roasted product obtained in the step (1) and an alkali solution, and then carrying out microwave treatment under the power of 300-900W to obtain a liquid product; and (3) evaporating and concentrating the liquid product under the condition that the pH value is 10-12 to obtain molybdate crystals. The method can obviously improve the recovery rate of molybdenum.

The invention belongs to the technical field of metal surface rust prevention, and discloses a treating fluid for metal surface rust prevention and a preparation method of the treating fluid. The coating is prepared from components in parts by mass as follows: 5-15 parts of a silane coupling agent, 3-10 parts of nano titanium dioxide, 1-4 parts of benzotriazole, 1-4 parts of molybdate, 1-5 parts of a dispersing agent, 2-6 parts of a coalescing agent, 1-4 parts of a surfactant, 0.5-3 parts of an accelerant, 0.5-3 parts of citric acid, 1-5 parts of acetic acid and 50-80 parts of deionized water. The preparation method comprises the following steps: sequentially adding the components into a stirring processing container according to a certain sequence, and stirring at a certain speed to obtain a treating fluid; according to the technical scheme, through synergistic interaction of all the components, rust can be removed, a layer of compact and continuous protective film can be formed on the metal surface, a very good anti-rust effect is achieved, benzotriazole and molybdate can also form an adsorption film, metal is protected through a large number of films of various types, the anti-corrosion effect of the protective film is improved, and the service life of the protective film is prolonged. The anti-rust effect is greatly improved.

A process method for preparing acrylonitrile through propylene ammoxidation belongs to the field of chemical engineering, and is characterized in that in a corresponding device and a reaction system of the method, propylene, ammonia gas and air (in terms of O2) enter a fluidized bed reactor at 400-450 DEG C and 0.01-0.15 MPa for reaction according to a ratio of 1: (1-1.5): (2-10) at a weight hourly space velocity of 0.04-0.1 h <-1 >; the micro-sphere catalyst with the particle size of 40-60 microns in the dense-phase section and the dilute-phase section has alpha-phase bismuth molybdate, gamma-phase bismuth molybdate and lattice oxygen active centers and meets the chemical formula MoaBibNicWdTleVfPgSixOy, the atomic ratio a in the formula is 21-22, the atomic ratio b in the formula is 1.5-2, the atomic ratio c in the formula is 4-5, the atomic ratio d in the formula is 0.8-1, the atomic ratio e in the formula is 0.09-0.1, the atomic ratio f in the formula is 0.15-0.2, the atomic ratio g in the formula is 0.8-1, the atomic ratio x in the formula is 70-71, and y is the number of oxygen atoms needed by the atomic valence of all elements; a product enters a quench tower and a water absorption tower to be neutralized and cooled, and then passes through a recovery tower, an acetonitrile tower, a decyanation tower, a layering device and a finished product tower to realize separation of a water phase and an organic phase, so that crude acetonitrile, hydrocyanic acid and refined acrylonitrile are further obtained. The process is good in conversion degree and product selectivity, stable and reliable in operation, energy-saving and environment-friendly.

The invention belongs to the field of material preparation, and particularly relates to a 2H-phase molybdenum disulfide crystal and a preparation method and application thereof. Comprising the following steps: mixing potassium molybdate and powdered sulfur, grinding, sintering in an Ar / H2 mixed atmosphere, and cooling to room temperature to obtain a product A; mixing the product A with sulfur powder, grinding, sintering in an Ar / H2 mixed atmosphere, and cooling to room temperature to obtain a product B; and sintering the product B in an Ar / H2 mixed atmosphere, cooling to room temperature, washing, and drying to obtain the 2H-phase MoS2 crystal. According to the preparation method disclosed by the invention, the purity and the crystal integrity of the 2H-phase MoS2 crystal are remarkably improved, and meanwhile, the interlayer spacing of the 2H-phase MoS2 crystal is optimized; in addition, the 2H-phase MoS2 crystal disclosed by the invention is used as a catalyst of a Li-CO2 battery positive electrode material, so that the electrochemical performance and the energy conversion efficiency of a Li-CO2 battery are remarkably improved.

The invention relates to the technical field of photocatalysis, in particular to a terbium and cerium doped MIL-177 confinement multi-metal cluster photocatalyst, which is prepared from terbium / cerium double metal elements, an MIL-177 metal organic framework, a multi-tungsten phosphomolybdate nanocluster and L-cysteine, according to the photocatalyst, an MIL-177 metal organic framework modified by terbium / cerium double metal elements is used as a substrate, a multi-tungsten phosphomolybdate nanocluster is used as an active center, microwave hydrothermal synthesis and solvothermal synthesis are performed, and L-cysteine surface modification is performed. Double metal elements terbium and cerium doped aluminum-based metal organic frameworks are combined with multi-tungsten phosphomolybdate nanoclusters, and surface modification is performed through L-cysteine, so that the visible light absorption range is widened, efficient separation of photo-generated charges is realized, catalytic active sites are increased, and the efficiency and selectivity of photocatalytic reduction of carbon dioxide are improved.

The invention discloses a Mo in-situ doped transition metal layered double hydroxide derivative catalyst. The Mo in-situ doped transition metal layered double hydroxide derivative catalyst is of a nanometer two-dimensional layered structure; nitrate, aluminum nitrate and molybdate are used as raw materials, and a series of nano flaky Mo-X / Al2O3 composite metal oxide catalysts with high activity, high selectivity and high stability are obtained through co-hydrothermal precipitation and one-step roasting reduction. The invention further discloses a preparation method and application of the Mo in-situ doped transition metal layered double hydroxide derivative catalyst. According to the invention, macromolecules in biomass or biomass waste can be effectively depolymerized and liquefied into high-calorific-value bio-oil, so that the effect of turning waste into wealth from oriented conversion of the waste into bio-fuel is realized, and meanwhile, the bidirectional positive effects of avoiding environmental pollution caused by direct emission of the biomass waste and realizing comprehensive utilization of resources are realized; and a path with more economic benefits is provided for conversion from biomass wastes to renewable energy sources.

The invention discloses a preparation method of a bacterial cellulose / bismuth molybdate composite photocatalytic material, which comprises the following steps: firstly, carrying out alkali washing on in-situ growth bacterial cellulose, and freeze-drying for later use; shearing a certain amount of bacterial cellulose to prepare a bacterial cellulose suspension, and adding bismuth molybdate powder; carrying out ultrasonic full mixing, and carrying out vacuum filtration and hot pressing; and finally, preparing the bacterial cellulose / bismuth molybdate composite photocatalytic material. According to the invention, an in-situ growth and vacuum filtration method is adopted, so that the method is low in cost, green and pollution-free, and does not need high-temperature reaction; meanwhile, the bacterial cellulose / bismuth molybdate composite photocatalytic material is good in stability, can be recycled and has excellent photocatalytic performance, the degradation rate of rhodamine B can reach 70% or above within 150 min, and the degradation rate of the bacterial cellulose / bismuth molybdate composite photocatalytic material can still reach 50% or above after 5 times of experiments are cyclically repeated.

The invention relates to the technical field of photocatalysts, and particularly discloses modified bismuth molybdate as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a homogeneous solution A containing a bismuth source; sO4 < 2-> and a molybdenum source are dispersed in a solvent according to the molar mass ratio of 1: 1-1: 10, and a homogeneous solution B is obtained; uniformly mixing the homogeneous solution A and the homogeneous solution B to obtain a solution C; and carrying out a hydrothermal method on the solution C to obtain the modified bismuth molybdate. By doping SO4 < 2-> into bismuth molybdate, the physicochemical properties of bismuth molybdate are optimized from multiple aspects, the photocatalytic activity of bismuth molybdate is improved, and excellent performance is achieved in the aspect of photocatalytic degradation of tetracycline in actual wastewater. The prepared modified bismuth molybdate not only can efficiently utilize visible light, but also is rich in oxygen vacancies on the surface, has high specific surface area, strong adsorbability and efficient photon-generated carrier separation efficiency, shows strong redox activity, and remarkably promotes pollutant degradation.

The invention discloses an iron oxide pigment with super weather resistance and corrosion resistance and a preparation method thereof, and relates to the technical field of weather-resistant and corrosion-resistant iron oxide pigments. The invention discloses an iron oxide pigment with super weather resistance and corrosion resistance. The iron oxide pigment is prepared from the following components in parts by mass: 100 parts of iron oxide, 1.5 to 3 parts of silane coupling agent, 2 to 4 parts of aluminum zirconate, 0.5 to 1.5 parts of weather-resistant antioxidant, 0.8 to 2 parts of molybdate corrosion inhibitor, 0.5 to 2 parts of nano silicon dioxide and 0.3 to 1 part of organic bentonite. Through an innovative composite formula and a preparation process, the stability of the iron oxide pigment in severe environments such as ultraviolet rays, damp heat and salt mist is greatly enhanced, excellent weather resistance and corrosion resistance are shown, the service life of the material can be effectively prolonged, and the maintenance cost can be reduced.

The invention discloses a post-treatment liquid and application thereof in an anode foil formation post-treatment process, and the post-treatment liquid comprises the following components in percentage by mass: 0.1-5% of a main film-forming agent, 0.05-3% of a synergistic stabilizer and the balance of a solvent, the main film-forming agent is selected from at least one of a waterborne polyurethane emulsion and a silane coupling agent; the synergistic stabilizer is selected from at least one of organophosphate, molybdate and tungstate. The main film-forming agent and the synergistic stabilizer are compounded to obtain the post-treatment liquid, on one hand, the synergistic stabilizer is firmly combined with an aluminum oxide substrate to carry out deep passivation treatment on an oxidation film on the surface of the anode foil, and on the other hand, the synergistic stabilizer is subjected to network crosslinking with a hydrophobic protection layer formed by the main film-forming agent; the three-dimensional composite protective film can effectively isolate water molecules, repair microdefects on the surface of an oxidation film, prevent the phenomena of specific volume attenuation, leakage current increase and the like of the anode foil, and improve the long-term working reliability of the capacitor.

The invention discloses a green and environment-friendly superfine bentonite anticorrosive coating and a preparation process thereof. The anticorrosive paint is prepared from 40 to 70 parts of water-based film forming matter, 0.3 to 3.0 parts of composite bentonite, 1.0 to 8.0 parts of a green corrosion inhibition system, 2.0 to 12.0 parts of an auxiliary agent, 0.30 to 0.40 part of a surface modifier, 10 to 30 parts of deionized water and 0.5 to 5 parts of a cosolvent. The composite bentonite is prepared by compounding sodium bentonite, nano titanium dioxide and a natural antibacterial extract according to the mass ratio of 100: (3-5): (0.3-2.0); the green corrosion inhibition system is formed by compounding molybdate, an organic corrosion inhibitor and a silane co-condensation compound. The preparation process comprises four key steps of preparation of a composite bentonite suspension, surface functionalization treatment, gradient shearing dispersion and coating blending. The salt spray resistance of the anticorrosive paint can reach 1150 hours, the VOC content is as low as 35 g / L, the antibacterial rate of the natural antibacterial extract is 97.2%, and the anticorrosive paint has excellent anticorrosive performance and green and environment-friendly characteristics.

The invention provides a bismuth molybdate / polymer photocatalytic porous fiber membrane as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic membrane degradation of organic pollutants in a water body. The method aims to overcome the problems of low catalytic efficiency caused by easy agglomeration and precipitation of a powder photocatalyst, high energy consumption in a recycling process and the like. According to the technical scheme, the preparation process of the bismuth molybdate / polymer photocatalytic porous fiber membrane is described in detail and comprises the steps of preparing the porous fiber membrane, loading a photocatalyst, obtaining the bismuth molybdate / polymer photocatalytic porous fiber membrane and the like. The prepared photocatalytic porous fiber membrane shows excellent photocatalytic activity and cycling stability on organic pollutants in a water body, and is easy to reuse. The technology integrates the advantages of photocatalysis and membrane separation, is efficient, economical and environment-friendly, and provides an innovative and practical solution for wastewater treatment.

The invention belongs to the technical field of photocatalysis and environmental governance, and particularly relates to a composite photocatalyst, in particular to a graphite-phase carbon nitride / molybdenum trioxide composite photocatalyst as well as a preparation method and application thereof. The method comprises the following steps: S1, dispersing ammonium heptamolybdate in deionized water, adjusting the pH value of the solution to 0.5 + / -0.3 by using sulfuric acid, stirring and centrifuging the formed system, and carrying out vacuum drying to obtain a molybdic acid precursor; s2, mixing melamine and the molybdic acid precursor, calcining the formed mixture, and naturally cooling to room temperature after calcining is finished, so as to obtain the composite photocatalyst. Tests prove that the prepared catalyst has excellent cycling stability, still keeps high catalytic activity after being recycled for multiple times, and has a good industrial application prospect.

Provided in the present invention are a phosphorus-free pre-filming agent and a preparation method therefor, and a pre-filming method for a water-cooled heat exchanger. The phosphorus-free pre-filming agent comprises the following raw materials in percentage by weight: 1-10% of an amino acid containing two carboxyl groups in the molecule thereof, and / or a salt thereof; 1-10% of hydroxycarboxylic acid and / or a hydroxycarboxylate; 1-10% of a zinc salt; 1-5% of a molybdate; 1-10% of a polymer; and the balance being water. A film obtained when the addition amount of the phosphorus-free pre-filming agent of the present invention reaches 100 ppm has good performance, and the longest duration of a red dot test of same can reach 30 s.

The invention relates to the technical field of anaerobic methanogenesis, and provides a polyurethane foam filler as well as a preparation method and application thereof. The polyurethane foam filler comprises a polyurethane foam body and auxiliaries dispersed in the polyurethane foam body, and the auxiliaries comprise nano zero-valent iron, molybdate and a conductive carbon material. According to the polyurethane foam filler provided by the invention, through the synergistic effects of filler surface hydrophilicity, reducing atmosphere, inhibition on sulfate reduction reaction, promotion on interspecific electron transfer and the like, the starting of an anaerobic methanogenesis process can be accelerated, the impact resistance is enhanced, the efficiency of the anaerobic methanogenesis process and the reaction operation stability are effectively improved, and the service life of the polyurethane foam filler is prolonged. And the method has wide practical value and application prospect.

The present application relates to the technical field of copper clad laminates, and discloses a copper clad laminate, a resin composition for the copper clad laminate, and spherical silicon and a preparation method therefor. The spherical silicon of the present application is composed of spherical silicon dioxide and zinc molybdate particles dispersedly grown on the surface of the spherical silicon dioxide in situ and has a diameter of less than 10 microns and a D50 of 0.6-6 microns. The content of zinc molybdate per unit area on the surface of the spherical silicon dioxide is 0.03-1 g / m2, and the size of the zinc molybdate particles is less than or equal to 400 nm. The preparation method comprises: enabling spherical silicon dioxide to come into contact with / be mixed with a soluble molybdate and a zinc salt in an aqueous reaction system; and reacting the soluble molybdate with the zinc salt in situ on the surface of the spherical silicon dioxide, so as to form spherical silicon chemically coated with zinc molybdate particles. In the present application, by directly synthesizing the zinc molybdate in situ on the surface of the spherical silicon dioxide by means of a hydrothermal method, the structural morphology of the obtained spherical silicon and the size of the zinc molybdate particles can be effectively controlled, thereby ensuring that the wear of a drill bit during the drilling of the copper clad laminate is effectively mitigated.

A catalyst for preparing acrylonitrile by propylene ammoxidation, a preparation method therefor, and a use thereof. The catalyst comprises an active component and a carrier, and the active component comprises Mo, Bi, Fe, at least one rare earth element, at least one alkali metal element, and at least one alkaline earth metal element. The catalyst has a molybdate crystal plane distribution index RQ of 0.65-0.98, where RQ = (R'+Q') / (R+Q).

The application discloses a homopolymolybdate hybrid resistive random access memory material based on a tetraphenylstyrene molecule and a preparation method and application thereof. The preparation method comprises the following steps: dissolving a mixture of 0.05 mmol of homopolymolybdate and 0.1 mmol of the tetraphenylstyrene molecule in 10 mL of water, stirring for 2 hours, adjusting the pH to 5.0 by using HCl to obtain a mixed solution; moving the mixed solution into a 25 mL stainless steel reaction kettle lined with polytetrafluoroethylene, reacting at 160 DEG C for 3 days, and obtaining a colorless block crystal after cooling; and after filtration, washing and drying, the homopolymolybdate hybrid resistive random access memory material based on the tetraphenylstyrene molecule is obtained. The method is simple and easy to operate, raw materials are easy to obtain, and the method is easy to realize. No harmful product is generated in the preparation process, and the method is an environment-friendly green synthesis. A multi-level controllable memory storage material is prepared, and the material can be applied to a multi-level memristor.

The invention relates to an amorphous bismuth molybdate photocatalytic material as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. The preparation method of the amorphous bismuth molybdate photocatalytic material comprises the following steps: (1) dissolving Bi (NO3) 3.5 H2O in an HAC solution, uniformly mixing and stirring at room temperature, and marking as a solution A; dissolving Na2MoO4 in water, adding a water-soluble anionic polymer, uniformly stirring, and marking as a solution B; and (2) slowly dropwise adding the solution B into the solution A, carrying out a co-precipitation reaction under the conditions of normal temperature and normal pressure, after dropwise adding is completed, maintaining heating and stirring for a period of time, then carrying out normal-temperature stirring, and after stirring is completed, carrying out centrifugation, washing and drying to obtain the amorphous bismuth molybdate photocatalytic material A-Bi2MoO6. The modified amorphous A-Bi2MoO6 provided by the invention has a relatively large specific surface area and more mesoporous structures, so that the adsorption of rhodamine B is enhanced, and the adsorbed dye can be efficiently catalyzed and degraded under the action of illumination.

The application provides a catalytic denitration agent and a preparation method thereof, and comprises the following components: a reducing base: urea 30-60 parts, ammonium carbamate 10-25 parts, ammonium carbonate 5-15 parts, ammonium bicarbonate 5-15 parts; a phase change catalytic component: ammonium dihydrogen phosphate 2-6 parts, di-ammonium hydrogen phosphate 1-5 parts, molybdate 0.05-0.5 parts, tungstate 0.1-0.8 parts, organic acid metal salt 0.1-0.8 parts, modified zeolite 1-8 parts; a functional additive: dispersant 0.2-1.0 parts, surfactant 0.1-0.6 parts, corrosion inhibitor 0.05-0.2 parts. The application constructs a multi-component complex catalytic system, and the prepared high-molecular catalytic denitration agent can realize the unity of wide-temperature high-efficiency denitration, low corrosion, low ammonia escape and high operation stability while significantly reducing the phase change temperature and energy consumption, and effectively solves the multiple problems of harsh reaction conditions, unstable efficiency and equipment corrosion in the prior art.

The present invention provides a doped manganese-molybdenum oxide catalyst, a preparation method, and a method for catalytically removing VOCs using the same, and relates to the technical field of inorganic materials and air pollution control. The preparation method provided by the present invention uses potassium permanganate, manganese sulfate, and molybdate as raw materials, and distilled water as a solvent, and is prepared by a hydrothermal reaction. The preparation method provided by the present invention is simple and easy to operate, has a large output, and is environmentally friendly. The reaction temperature required for the catalytic removal of VOCs by the prepared catalyst is low, and it can remove more than 90% of benzene at 230°C. It has strong adaptability and still has high catalytic activity in complex atmospheres such as high moisture, particulate matter, and SO2. The catalyst also has strong durability and recyclability, can be used for long-term work in industry, and can work efficiently in industrial environments that require alternating hot and cold temperatures.