269 results about "Molybdate" patented technology

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 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 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 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.

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.

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 application relates to a catalyst for catalytically synthesizing propylene acid from propane and application thereof, and the catalyst is represented by the following general formula: Mo a V b Te c Nb d Ni e O x Wherein, a, b, c, d and e respectively represent the atom numbers of Mo, V, Te, Nb and Ni, and the molar ratio of a:b:c:d:e is 7.0-9.0:1.7-2.5:1.0-1.5:1.7-2.3:0.1-1.0, and the value of x is determined by the oxidation state of each element; Ni is introduced by nickel molybdate, Mo is introduced by a molybdate and the nickel molybdate, and the nickel molybdate is prepared by co-precipitation of a molybdate and a nickel salt in the presence of an organic acid. According to the application, the content of different valence metals on the surface of the catalyst can be adjusted by introducing nickel into the catalyst through nickel molybdate, so that the content of high-valence elements Mo 6+ , V 5+ and Ni 2+ in the catalyst and the oxygen vacancy are increased, and the redox capacity of the catalyst is enhanced.

The invention discloses efficient flame-retardant smoke-suppressing polyurethane and a preparation method thereof.The efficient flame-retardant smoke-suppressing polyurethane comprises a material A and a material B. The material A is prepared from liquid polyether macromolecular dihydric alcohol, liquid polyether macromolecular trihydric alcohol, polyether carbonate polyol, a chain extender, a catalyst, a hydroxylation flame-retardant smoke-suppressing agent and a surface functional ceramic forming auxiliary; the material B is prepared from castor oil and diisocyanate; wherein the hydroxylated flame-retardant smoke suppressant is formed by carrying out ion exchange reaction on ammonium polyphosphate, an ammonium molybdate smoke suppressant and an alcohol amine modifier, and the surface functional ceramic forming additive is obtained by carrying out self-polymerization on a polyphenol compound on the surface of the inorganic ceramic forming additive to form a polymer coating. According to the efficient flame-retardant smoke-suppression polyurethane provided by the invention, organic solvents such as DMF are not used in the preparation process, organic solvent pollution is eliminated from the source, the limit oxygen index of the prepared polyurethane is greater than 28%, and the prepared polyurethane passes a V-0 grade through a UL-94 vertical combustion test, is low in maximum smoke density and has excellent comprehensive properties such as mechanical properties.

This invention provides a self-supporting one-dimensional nanorod array composite material, its preparation method, and its application, belonging to the field of clean energy harvesting technology. The preparation method provided by this invention includes the following steps: mixing soluble nickel salt, soluble molybdate, and water, and carrying out a hydrothermal reaction to obtain a NiMo precursor; heat-treating the NiMo precursor and a modifier under a protective atmosphere to obtain the self-supporting one-dimensional nanorod array composite material. Experimental results show that the composite material prepared by the method provided by this invention has excellent electrocatalytic water splitting activity and operational stability, and photo-assisted synthesis further enhances the electrocatalytic water splitting activity of the composite material, making it applicable to solar-driven electrocatalytic water splitting.

The invention provides a corrosion inhibitor and a preparation method thereof, the corrosion inhibitor comprises an organic corrosion inhibitor and a metal salt corrosion inhibitor, the organic corrosion inhibitor comprises at least one of an organic amine compound and an organic acid salt compound, and the metal salt corrosion inhibitor comprises at least one of molybdate, titanate and zinc salt. The corrosion inhibitor provided by the invention is preferentially adsorbed on active sites on the metal surface through the chemical bonding effect of organic corrosion inhibitor molecules, so that corrosion is effectively blocked; meanwhile, the metal salt corrosion inhibitor acts with a metal matrix to form a compact protective film layer, and permeation of a corrosion medium is physically blocked. Due to the chemical and physical dual protection mechanism, the corrosion inhibitor has efficient, environment-friendly and long-acting corrosion inhibition performance on aluminum alloy, steel and the like in acid and salt mist environments.

The invention discloses an electrode material which is simple in preparation method, high in performance and capable of stably producing hydrogen by electrolyzing water, and also discloses a preparation method of a photocatalyst for purifying wastewater by using a derivative of the electrode material. The preparation method of the electrocatalyst mainly comprises the following steps: etching a nickel metal substrate by using diluted hydrochloric acid; the preparation method comprises the following steps: preparing a first-stage product, dissolving the first-stage product with a bismuth source and molybdate in a reaction kettle, carrying out hydrothermal synthesis to obtain a hydrothermal product, carrying out high-temperature calcination on the obtained material to obtain a sample precursor and a part of byproducts, finally repeating the reaction once to obtain a high-activity electrode and related byproduct derivatives, mixing the two byproducts, carrying out high-temperature calcination, and grinding to obtain a second-stage product. According to the prepared catalyst, a bismuth source is introduced to serve as an additive, a NiMoO4 / Fe2 (MoO4) 3 composite film layer active phase is constructed on an NF substrate through a one-step hydrothermal-corrosion-growth method, the active phase and an NF framework are induced through a confinement effect to form strong interface bonding, the electron transfer rate is increased, and the electrode performance is remarkably improved by reducing the valence band position of the active phase. The preparation process is simple to operate, the morphology of the catalyst is controllable, and derived by-products generate higher economic benefits.

The present invention provides a water treatment agent composition comprising water, a fluorescent substance which is a tracer substance, and a specific corrosion inhibitor, and having good stability, as well as a water treatment method using the water treatment agent composition. [Solution] A water treatment agent composition comprising water, a fluorescent substance, and at least one of molybdate compounds, phosphate compounds, and zinc compounds as a corrosion inhibitor, wherein the pH is 8 or higher.

The application belongs to the field of antibacterial two-dimensional nanomaterial Mxene catalysts, and particularly relates to a monolayer W@MoS2 nanosheet as well as a preparation method and application thereof. The method comprises the following steps: 1) dissolving water-soluble molybdate and water-soluble tungstate in water to obtain a mixed solution; 2) adding a sulfur source and an organic solvent to the mixed solution, and then performing reaction after mixing, and drying to obtain a powder. The monolayer W@MoS2 nanosheet has a unique two-dimensional planar structure, a large specific surface area, and good optical and electronic properties, and has high light-heat absorption in the near-infrared two region, i.e., the light-heat conversion efficiency is improved. Meanwhile, the peroxidase-like activity of the monolayer W@MoS2 nanosheet material realizes efficient light-heat amplification, can treat methicillin-resistant Staphylococcus aureus infection, and avoids heat therapy damage to normal tissues.

This invention relates to the field of materials preparation technology, specifically disclosing a method for preparing tungsten-molybdenum alloy powder based on a coprecipitation precursor. The method involves mixing sodium tungstate, sodium molybdate, and water to prepare a tungsten-molybdenum mixed solution; mixing the tungsten-molybdenum mixed solution with a precipitant solution containing zinc or cadmium salts, and allowing the tungsten and molybdenum to coprecipitate under stirring; filtering and washing the reaction slurry to obtain a wet precipitate of tungsten-molybdate coprecipitate, with the filtrate serving as the mother liquor; drying and grinding the wet precipitate of tungsten-molybdate coprecipitate to obtain tungsten-molybdate coprecipitate powder; and reducing the tungsten-molybdate coprecipitate powder in a hydrogen stream at 700-1000°C to obtain tungsten-molybdenum alloy powder and zinc or cadmium vapor. This invention combines the reduction and alloying reactions into one, with a reaction temperature below 1000°C, shortening the tungsten-molybdenum alloy powder preparation process and significantly saving energy and reducing consumption.

The application provides a molybdenum trioxide extraction method, and belongs to the field of extraction metallurgy. The molybdenum trioxide extraction method provided by the application comprises the following steps: vacuum smelting a molybdenum-containing material to obtain sublimates, and cooling the sublimates to obtain the molybdenum trioxide; the molybdenum content in the molybdenum-containing material is 37.42-46.31 wt%, and the oxygen content is 30.74-38.13 wt%; the temperature of the vacuum smelting is 880-1200 DEG C, and the vacuum degree is 0.47-10 Pa; and the cooling rate of the cooling is 5-10 DEG C / min. The molybdenum trioxide is obtained by decomposing molybdate in the molybdenum-containing material through vacuum smelting, and the original molybdenum trioxide in the molybdenum-containing material sublimates under high-temperature conditions to obtain high-purity molybdenum trioxide, thereby effectively improving the extraction efficiency of the molybdenum trioxide; and the extraction method is simple, the low-grade molybdenum-containing material is used as the raw material, the extraction cost is lower, and the environment is not polluted.

A layered double hydroxide (LDH) in a heterogeneous electrocatalytic sp 2 Application of C–H activation and CO2 carboxylation. The preparation method of a cobalt-iron molybdate intercalated hydrotalcite (CoFe-Mo LDH) catalyst is as follows: the CoFe-Mo LDH is prepared by a simple coprecipitation method. The CoFe-Mo LDH is used for a heterogeneous electrocatalytic sp 2 C–H activation and CO2 carboxylation. By changing the CoFe-Mo LDH intercalation of the CoFe-Mo LDH solvent environment, a series of mono-carboxylation and di-carboxylation products can be obtained, such as: in the case of benzene as a substrate and DMF as a solvent, a mono-carboxylation product benzoic acid is obtained; in the case of benzene as a substrate and MeCN as a solvent, a di-carboxylation product isophthalic acid is obtained. For the first time, the on-demand switching of the mono-carboxylation and di-carboxylation of phenyl substrates is realized, and this research not only provides a new heterogeneous electrocatalytic strategy to achieve the carbon neutralization target, but also successfully converts cheap and easily available chemicals into high-value and carbon chain growth carboxylic acids under mild conditions.

The invention relates to the technical field of metal catalyst preparation, in particular to a nitrogen-doped carbon-loaded molybdenum-based monatomic catalyst and a preparation method and application thereof. The preparation method of the nitrogen-doped carbon-loaded molybdenum-based monatomic catalyst comprises the following steps: dissolving a carbon precursor and a template agent in deionized water, stirring to obtain a nitrogen-carbon precursor, then adding soluble molybdate, violently stirring, and then drying to obtain a molybdenum and nitrogen-carbon precursor solid mixture; then, a flash Joule heat technology is adopted, and the nitrogen-doped carbon-loaded molybdenum-based monatomic catalyst with a large number of wrinkled nanosheets and an excellent pore channel structure is synthesized under the coupling action of temperature and an electric field. The molybdenum-based monatomic prepared by the method has good activity in catalysis of hydrogen-free aqueous phase reforming of a lignin model compound and self-reforming hydrogenolysis of lignin.

This invention discloses a halogen-free flame-retardant polypropylene material and its preparation method, comprising 60-80 parts of polypropylene (PP), 4-8 parts of toughening agent, 15-25 parts of halogen-free flame retardant, 1-1.5 parts of antioxidant, 2-3 parts of light stabilizer, and 5-10 parts of modified graphene oxide flame retardant synergist. The modified graphene oxide flame retardant synergist is prepared by "nucleophilic substitution acyl chloride-nucleophilic substitution amidation-electrostatic interaction" using graphene oxide (GO), anhydrous sulfoxide, an amine compound H2N-R-NH2 containing at least two terminal primary amino groups, and molybdate. The -R- group is a divalent organic group used to connect the amide bond to the terminal primary amino group. The modified graphene oxide flame retardant synergist includes at least one amide bond -CONH-R-N- connected to the terminal primary amino group. The halogen-free flame-retardant polypropylene material provided by this invention exhibits excellent flame retardant properties while also improving its impact resistance and anti-dripping effect, and is safe and environmentally friendly.

The invention belongs to the technical field of concrete materials, and particularly relates to corrosion-resistant concrete for shield tunnel segments and a preparation method of the corrosion-resistant concrete. The concrete comprises sulphoaluminate cement, fly ash, slag powder, machine-made sand, gravel, a polycarboxylate superplasticizer, a defoaming agent, water and two key modified components, wherein the two key modified components comprise a layered double hydroxide-aluminum silicate nanosheet compound and a phosphate radical intercalation modified strontium molybdate slow-release corrosion inhibitor. During preparation, firstly, all the dry materials are put into a stirrer for dry mixing, then water and the additive are added for stirring to obtain mixed slurry, and a finished product is obtained after pouring, vibrating and steam curing. Wherein the two modified compounds are synthesized through a specific process, the former can adsorb corrosive ions and refine pores, and the latter can slowly release corrosion-inhibiting ions to protect reinforcing steel bars. The prepared concrete has excellent chloride ion penetration resistance, sulfate erosion resistance and carbonization resistance, the durability is remarkably improved, and the concrete is particularly suitable for shield tunnel segments in the severe corrosion environment.

The invention relates to a chromate-free passivator for a copper bar for a new energy automobile battery and a preparation method of the chromate-free passivator, and belongs to the technical field of metal surface treatment.The chromate-free passivator comprises, by weight, 6-16 parts of organic azole compounds; 10 to 30 parts by weight of molybdate; 2-10 parts by weight of a silane coupling agent; 4 to 12 parts by weight of a water-soluble polymer; 1-6 parts by weight of an accelerant; 0.2 to 2 parts by weight of a surfactant; and the balance of deionized water. According to the chromium-free passivating agent for the copper bar for the new energy automobile battery and the preparation method of the chromium-free passivating agent, the prepared chromium-free passivating agent for the copper bar for the new energy automobile battery eliminates the harm of hexavalent chromium to the environment and operators from the source, completely meets the strict requirements of global green manufacturing and environmental protection laws and regulations, and has a wide application prospect. And support is provided for the concept of full-life-cycle environmental protection of new energy automobiles, the copper bar surface treatment industry is promoted to develop towards the environment-friendly and sustainable direction, and the advantage of remarkable environmental protection performance is achieved.

This invention relates to a laser-engravable high-gloss black coating for automotive taillights and its preparation method, belonging to the field of coating preparation technology. The formulation of the laser-engravable high-gloss black coating is as follows (by weight): 40-60 parts polyurethane acrylate, 3-5 parts modified nano-bismuth oxide, 3-5 parts trimethylolpropane triacrylate, 1-3 parts 4-methylbenzophenone, 1-2 parts carbon black, and 0.5-1.5 parts leveling agent. The modified nano-bismuth oxide is prepared by treatment with ammonium molybdate solution and grafting with a silane coupling agent. Its layered structure synergistically enhances UV absorption efficiency and weather resistance with the molybdate layer. 4-methylbenzophenone and modified nano-bismuth oxide form a light absorption composite system, which, combined with the high cross-linking density network constructed by trimethylolpropane triacrylate, achieves narrow linewidth laser engraving precision. This invention solves the technical problems of low laser engraving precision, poor adhesion, and insufficient solvent resistance in traditional high-gloss black coatings, and is particularly suitable for precision marking applications such as automotive taillights.

The invention relates to the technical field of preparation of electronic components, and particularly discloses lead-free composite glass powder for side insulation of a resistor disc and a preparation method of the lead-free composite glass powder. The lead-free composite glass powder for side insulation of the resistor disc comprises the following raw materials in parts by weight: 90-110 parts of matrix glass powder and 10-30 parts of functional filler, and the matrix glass powder is vanadate-molybdate series lead-free glass. The lead-free composite glass powder is provided for the side face of the resistor disc, a compact insulating layer is formed after sintering, and the resistor disc has the advantages of being good in dielectric strength and good in durability.

The invention discloses a copper molybdate catalyst, a preparation method, application and a method for producing 4-propyl phenol. A preparation method of a copper molybdate catalyst for catalyzing demethoxylation of 4-propyl guaiacol comprises the following steps: mixing water-soluble molybdate, water-soluble copper salt and water to obtain a metal aqueous solution; and concentrating, drying and calcining the metal aqueous solution to obtain the copper molybdate catalyst. The preparation method is simpler to operate and more environmentally friendly, the prepared copper molybdate catalyst can be used for catalyzing 4-propyl guaiacol to remove methoxy so as to produce 4-propyl phenol, and the catalytic performance and stability are excellent.

The invention relates to a low-temperature SCR denitration catalyst for preventing ammonia escape and a preparation method thereof, and belongs to the technical field of catalysts. According to the catalyst, niobium-cerium composite oxide is used as an active component (25-45%), titanium-zirconium composite oxide is used as a carrier (50-70%), lignin-derived carbon microsphere modified bismuth molybdate is added as an auxiliary agent (3-7%), graphene quantum dots are used as a structure enhancer (0.5-2%, the particle size is 2-5 nm), and sesbania powder is used as a binder (1.5-2%). The assistant is prepared by reacting alkali lignin with formaldehyde and phenol to prepare microspheres, carbonizing, treating with nitric acid, and compounding with bismuth molybdate. The preparation method comprises the following steps: respectively preparing the active component, the carrier and the graphene quantum dots, mixing in proportion, adding the binder, granulating, molding, and calcining to obtain the catalyst. The catalyst has high specific surface area and specific pore size distribution, can effectively improve the low-temperature denitration efficiency and prevent ammonia escape, and is suitable for industrial low-temperature flue gas denitration treatment.

The invention belongs to the technical field of metal surface treatment materials, and particularly relates to an environment-friendly phosphorus-free high-adhesion silane ceramic film forming agent and application thereof. The potassium fluozirconate is subjected to electrochemical reaction on the metal surface to form skeleton particles and provide a basic physical barrier and corrosion resistance, the molybdate promotes metal oxidation and film formation, and the silane coupling agent provides a three-dimensional network structure and has a synergistic effect with the potassium fluozirconate and the sodium molybdate, so that the corrosion resistance and the adhesive force of the formed ceramic film can be effectively improved, and the corrosion resistance and the adhesive force of the ceramic film are improved. And fluotitanic acid is hydrolyzed to form an inorganic network structure, metal surface micropores are covered, passivation film growth is accelerated, phosphonobutane tricarboxylic acid and polyacrylic acid are added to form an organic-inorganic hybrid film, inorganic film microcracks are filled, the flexibility and adhesive force of the ceramic film are improved, and the service life of the ceramic film is prolonged. The film-forming agent is relatively simple in vitrification process for the metal surface, washing-free treatment can be selected after vitrification, only the PH value needs to be controlled in tank liquor control, and the film-forming agent can be suitable for various metal materials.

The invention relates to a preparation method and application of a MoP-C electrocatalyst based on a polymolybdic acid-based metal organic framework, and belongs to the technical field of electrocatalytic materials, the preparation method of the MoP-C electrocatalyst comprises the following steps: S1, synthesis of an organic ligand btpe, S2, synthesis of a polymolybdic acid-based metal organic framework CUST-698 crystal, S3, in-situ synthesis of the MoP-C electrocatalyst, and S4, in-situ synthesis of the MoP-C electrocatalyst. The MoP-coated C electrocatalyst is applied to an electrocatalytic hydrogen evolution electrode, the MoP-coated C electrocatalyst or the electrocatalytic hydrogen evolution electrode applying the MoP-coated C electrocatalyst is applied to hydrogen evolution reaction (HER) in acidic or alkaline electrolyte, N2 adsorption and desorption tests prove that the MoP-coated C electrocatalyst has a multi-stage pore channel system composed of micropores and mesopores, and the MoP-coated C electrocatalyst has the advantages that the MoP-coated C electrocatalyst can be applied to the hydrogen evolution reaction (HER) in the acidic or alkaline electrolyte; the MoP-C electrocatalyst prepared by the preparation method disclosed by the invention is favorable for permeation of electrolyte and desorption of hydrogen bubbles, exposes a large number of active sites, has high hydrogen evolution activity, shows SEM and TEM images, effectively prevents agglomeration due to the structure of the MoP-C electrocatalyst, ensures full utilization of the active sites and rapid substance transport, and has good stability.

The invention discloses a recovery method of a catalyst containing platinum, silver, chromium, vanadium, molybdenum and aluminum, which comprises the following steps: uniformly mixing a waste catalyst, caustic alkali and iron powder, reacting at high temperature, cooling to obtain a melt, dissolving the melt, and filtering to obtain a first filter residue and a first filtrate; dissolving the first filter residue with nitric acid, and filtering to obtain platinum-containing waste filter residue and second filtrate; adding a sodium chloride solution into the second filtrate, and filtering to obtain silver chloride filter residues and third filtrate which contains chromic nitrate; adding a barium chloride solution into the third filtrate, reacting at room temperature, and filtering to obtain barium chromate solid filter residues and fourth filtrate; adjusting the pH value of the first filtrate to 7-8 by using an acid, reacting at room temperature, and filtering to obtain activated aluminum oxide filter residues and a fifth filtrate; adding ammonium chloride into the fifth filtrate, reacting at room temperature, and filtering to obtain ammonium vanadate filter residues and sixth filtrate; and adjusting the pH value of the sixth filtrate to be less than 1 by using sulfuric acid, reacting at room temperature, and filtering to obtain molybdic acid filter residues and a seventh filtrate.

The present invention belongs to the field of chemical engineering. Disclosed are an acrylonitrile catalyst, and a preparation method therefor and the use thereof. The preparation method comprises: (1) mixing solutions of a molybdenum compound and a bismuth compound at an Mo / Bi molar ratio of 0.5-1.5 to prepare bismuth molybdate containing an α-phase and / or a γ-phase; (2) synthesizing a pentasil-type molecular sieve having an Si / V molar ratio of 50-150 from a silicon source, an organic amine, and a vanadium compound; (3) mixing a silica sol with a molybdenum compound solution at an Si / Mo molar ratio of 0.5-1, then sequentially adding solutions of a nickel, a tungsten, and a thallium compound, and phosphoric acid, the molecular sieve, and the bismuth molybdate thereto, such that the ratio of the weight percentages of Mo, Bi, Ni, W, Tl, V, and P in the catalyst, on the basis of oxides, is (37-38):(4-6):(3-5):(2-3):(0.2-0.3):(0.1-0.3):(0.7-0.8); (4) adding SiO2 powder thereto, such that SiO2 accounts for 45 wt% to 55 wt% of the catalyst; and (5) pulping and homogenizing the resulting mixture, then spray molding same at an outlet temperature of 150-180°C, and calcining same in an air atmosphere at 550-680°C for 1-6 h. The catalyst has a good activity, selectivity and stability, and is wear-resistant.

The invention discloses an industrial sewage orthophosphate detection kit and a detection method. The orthophosphate detection kit comprises a color developing agent A and a color developing agent B. The color developing agent A comprises molybdate, acid and water, and the color developing agent B comprises stannous chloride and glycerin. The kit can realize on-site qualitative or semi-quantitative detection of orthophosphate in a water sample, has the advantages of simplicity in operation, less time consumption and reduction of chromatic aberration, and is suitable for on-site rapid detection.