4370 results about "Thermal reaction" patented technology

The invention belongs to the technical field of synthesis of magnesium hydroxide flame retardants, and provides a synthesis method and flame-retardant application of hexagonal flaky magnesium hydroxide, and the synthesis method comprises the following steps: step 1, dissolving a mineralizer, a crystal form control agent and magnesium chloride in water in proportion; step 2, putting a certain amount of the mixed solution into a high-pressure reaction kettle for hydrothermal reaction; step 3, after the reaction is finished, taking out the cooled solution from the high-pressure reaction kettle, and filtering and separating out a white product; 4, drying the sample, and grinding to obtain pure magnesium hydroxide powder; through reasonable process design and optimization, the prepared magnesium hydroxide not only has regular morphology and better dispersity, but also has excellent performance in the field of flame retardance of high polymer materials, meets the requirement of environmental protection, has the production advantages of low cost and high efficiency, and is suitable for industrial production. The method not only can effectively improve the overall utilization rate of salt lake resources, but also has remarkable economic and application values, and has wide industrial application prospects.

The invention relates to a carbon quantum dot for strengthening and promoting growth of microalgae and application thereof. In the process of preparing the carbon quantum dots by a conventional hydrothermal method, a precursor mixture is subjected to acidification modification in advance, the pH value is adjusted to 2 by using nitric acid, and then a hydrothermal reaction is performed, so that the prepared carbon quantum dots have the capability of promoting the growth of microalgae. However, if other acids are adopted or pH adjustment is not in place, the effect cannot be achieved, and even the inhibition effect can be achieved. The obtained product is good in effect and stable in performance, no special reaction device needs to be additionally arranged in the acidification modification process, and the method has the advantages that operation is easy and convenient, raw materials are easy to obtain, and the process can be quantified; the method is simple and convenient in process operation, has universality and is easy for industrial production.

The invention discloses a method for preparing a waste gas purification catalyst from red mud and electrolytic manganese residues, a product and application thereof, and belongs to the field of solid waste resource utilization. According to the method, the preparation process is simple, efficient resource utilization of the red mud and the electrolytic manganese residues can be achieved through reasonable burdening, hydrothermal reaction and pyrolysis carbonization processes, and no other waste liquid or secondary solid waste is generated in the preparation process. The prepared waste gas purification catalyst is excellent in catalytic performance and can be used for quickly converting harmful gas of 1, 2-dichlorobenzene.

The invention discloses a method for preparing a catalyst by using red mud and titanium dioxide acidolysis waste residues as well as a product and application thereof. The method comprises the following steps: calcining red mud, adding titanium dioxide acidolysis waste residues and an auxiliary agent, uniformly stirring, adding a desulfurization waste liquid, uniformly stirring, carrying out a hydrothermal reaction, carrying out solid-liquid separation, and calcining to obtain the catalyst material. The preparation process is simple, and efficient resource utilization of the red mud and the titanium dioxide acidolysis waste residues can be achieved. The catalyst prepared through a hydrothermal reaction and a secondary calcination process realizes efficient removal of COD, ammonia nitrogen, total phosphorus and heavy metal pollutants in waste liquid through a photocatalytic function.

The invention relates to a preparation method of monodisperse spherical alumina powder with uniform granularity. The preparation method comprises the following steps: dissolving and stirring an aluminum source, a precipitator and a dispersing agent in ultrapure water to prepare an aluminum oxide precursor solution; transferring the prepared aluminum oxide precursor solution into a hydrothermal reaction kettle, carrying out heating reaction, after the hydrothermal reaction is finished, naturally cooling to room temperature, alternately and respectively washing with ultrapure water and ethanol, and drying to obtain aluminum oxide precursor powder; and sintering the prepared aluminum oxide precursor powder in a muffle furnace in an air atmosphere to obtain the spherical aluminum oxide powder. The hydrothermal method is adopted to react in a high-temperature and high-pressure environment, so that the reaction uniformity is improved, and the spherical aluminum oxide precursor with uniform granularity and consistent morphology is obtained. The bending strength of the obtained ceramic material is remarkably improved, and the highest bending strength reaches 245MPa. The method has wide application prospects in the fields of heat-conducting composite materials, integrated circuit films, substrate materials, 3D printing materials, precision polishing materials and the like.

The invention discloses preparation of a bionic copper-based MOF nano-enzyme and application of the bionic copper-based MOF nano-enzyme in hydroquinone detection, and the bionic copper-based MOF nano-enzyme is prepared by the following method: dissolving terephthalic acid H2BDC and L-histidine His in N, N-dimethylformamide DMF to obtain a solution A; adding copper chloride CuCl2. 2H2O into the solution A obtained by C1, and stirring to form a uniform mixed solution; carrying out hydrothermal reaction on the mixed solution obtained from C2 for a certain time, centrifuging to obtain a solid precipitate, cleaning the solid precipitate, and drying to obtain the bionic Cu / His-MOF nano-enzyme; the invention also discloses an application of the sensor in hydroquinone detection. The bionic copper-based MOF nano-enzyme has the advantages of being simple and convenient to synthesize, high in substrate affinity, high in catalytic capacity and the like, and meanwhile, a rapid, sensitive and reliable HQ detection method is provided.

The invention discloses a method for preparing a carbon monoxide oxidation catalyst by using red mud and tungsten-molybdenum smelting slag, which comprises the following steps of: uniformly stirring and mixing the red mud and the tungsten-molybdenum smelting slag at a high speed, mixing with inorganic strong acid, and performing ultrasonic-assisted stirring to obtain acid leaching slag; the acid leaching residues are subjected to low-temperature plasma activating treatment and then microwave activating treatment, and microwave activated plasma residues are obtained; weighing tricalcium phosphate and microwave activated plasma slag, and uniformly stirring to obtain phosphorus-calcium doped activated slag; weighing an ammonium sulfide solution and the phosphorus-calcium doped activated slag, uniformly stirring, transferring the obtained sulfur-phosphorus-calcium doped activated slag into a hydrothermal reaction kettle, carrying out hydrothermal reaction, carrying out compression molding on the obtained hydrothermal composite material, and carrying out pyrolysis carbonization treatment in an inert gas atmosphere to obtain the phosphorus-calcium doped activated slag. The obtained pyrolysis composite material is soaked with a silane coupling agent solution and then roasted again, and the carbon monoxide oxidation catalyst is obtained. The catalyst prepared by the invention can realize efficient oxidation photocatalysis of carbon monoxide under the conditions of normal temperature and normal pressure.

The invention discloses a method for preparing a catalytic material by synergistically utilizing red mud and electrolytic manganese residues as well as a product and application thereof. The method comprises the following steps: mixing electrolytic manganese residues and red mud, uniformly stirring, adding ammonium chloride, stirring, adding a hydrochloric acid solution, stirring, roasting and grinding. And adding an auxiliary agent, uniformly stirring, adding water, granulating, standing, carrying out hydrothermal reaction, and roasting to obtain the catalytic material. The preparation process is simple, the technological process is brief, the needed core raw materials are only the red mud and the electrolytic manganese residues, and resource utilization of the red mud and the electrolytic manganese residues is efficiently achieved. The prepared catalytic material can quickly adsorb pollutants in waste liquid under the condition of no photocatalysis, and the removal effect on COD (Chemical Oxygen Demand), ammonia nitrogen, total phosphorus and heavy metal mercury can be further remarkably improved under the photocatalysis condition.

The invention relates to the technical field of composite catalyst materials, in particular to a ferrocobalt bimetal hydroxide / BCN composite material and a preparation method and application thereof.The preparation method comprises the steps that cobalt nitrate and ferric nitrate are used for preparing a metal salt solution, sodium carbonate and sodium hydroxide are used for preparing a precipitant solution, a B-doped carbon nitride BCN material is added into the metal salt solution to form a uniform suspension, and the suspension is dried to obtain the ferrocobalt bimetal hydroxide / BCN composite material; dropwise adding the precipitant solution into the suspension to obtain a precursor solution, performing hydrothermal reaction on the precursor solution, and performing centrifugal impurity removal and drying to construct a heterostructure between layered double hydroxide and BCN in situ to obtain the Co-Fe LDH-coated BCN composite material. Through boron doping and heterostructure construction, the charge separation capacity of graphite carbon nitride is enhanced, the electron migration efficiency is improved through a heterointerface structure, the metal ion release amount and the cycle stability are controlled, and the catalytic performance is remarkably improved.

The invention discloses a metal particle Ni supported catalyst based on fly ash. The preparation method comprises the following steps: firstly, carrying out alkali fusion on fly ash to prepare powder; dissolving the powder and Ni (NO3) 2.6 H2O in a mixed solution of distilled water and absolute ethyl alcohol, adding polyethylene glycol, and performing ultrasonic stirring to obtain uniform dispersion liquid; and finally, continuously performing ultrasonic stirring on the dispersion liquid, performing hydrothermal reaction, cooling, performing centrifugal separation, drying, calcining, cooling and grinding to obtain the catalyst. The coal ash derivative zeolite is adopted as a carrier of the catalyst, Ni is loaded on the carrier to improve the specific surface and effective active sites of the carrier, the effective catalytic specific surface area of the catalyst is effectively improved, and the catalytic activity is improved, so that a stable and safe catalyst material for preparing methane through CO2 hydrogenation with high activity and selectivity is obtained; the space time yield of methane is high.

The invention discloses a ceramic rock plate with a decorative effect and a production process thereof, and belongs to the technical field of ceramics. The rock plate is composed of a green body layer, a ground glaze layer, a cover glaze layer and an ink jet pattern layer, and after firing, a micro-nano rough and low-surface-energy synergistic protection layer is formed through oxygen-nitrogen plasma activation, a hydrothermal reaction of aluminum salt and an ammonia source compound, high-temperature calcination and silane derivative dipping and curing. The green body takes wollastonite, quartz sand and the like as raw materials, and the ground glaze and the cover glaze adopt a feldspar-quartz-nepheline system; after firing, performing plasma treatment and hydrothermal treatment to generate needle-shaped aluminum oxide, and introducing a silane derivative to realize double functions of super-hydrophobicity and wear resistance. Compared with the prior art, the anti-fouling and wear-resistant coating reaches the national standard 5 level, the process is simple, and the coating can be directly connected to an existing production line and is suitable for high-end wall floor decoration.

The invention discloses an in-situ growth MOFs (Metal-Organic Frameworks) mixed matrix membrane as well as a method and application thereof, and belongs to the technical field of membrane separation. The method disclosed by the invention comprises the following steps: adding a Zn source and 2-methylimidazole into a solvent, and carrying out hydrothermal reaction to obtain Polymer-ZIF-8; the preparation method comprises the following steps: mixing Polymer-ZIF-8 with a diluent, and sequentially heating, uniformly mixing and cooling, so as to obtain a Polymer-ZIF-8 / diluent uniform block; the Polymer-ZIF-8 / diluent uniform block is subjected to post-treatment, and the MOFs mixed matrix membrane is obtained; the Zn source is a zinc ion type polymer. The method overcomes the problem of interfacial compatibility in mixed matrix membranes.

The invention relates to the technical field of environmental chemistry, in particular to a double-vacancy Fe0. 96S (at) MoS2 nano composite material as well as a wet-type mechanochemical synthesis method and application thereof. The preparation method comprises the following steps: firstly carrying out co-ball milling by utilizing a wet mechanical chemical synthesis method to obtain a low-crystallinity Fe0. 96S (at) MoS2 precursor, and then carrying out further calcination treatment to accelerate the thermal reaction of the precursor, improve the crystallinity and remove redundant sulfur powder impurities, thereby obtaining the high-crystallinity Fe0. 96S (at) MoS2 nano composite material. Iron powder is introduced in the process of preparing MoS2 nanosheets from molybdenum powder and sulfur powder, the reaction activity of the molybdenum powder and the sulfur powder is improved and the formation energy of MoS2 is reduced by utilizing the characteristic of ball-milling heat release of the iron powder and the sulfur powder, the reaction barrier that MoS2 is difficult to prepare between Mo and S through a mechanical ball-milling process originally is broken, and the generation of the MoS2 nanosheets is promoted.

Clean version of Abstract A catalyst and anode for hydrogen production by electrolysis as well as a preparation method, activation method and use thereof are provided. The anode for hydrogen production by electrolysis includes a catalyst which is nickel iron barium hydrotalcite with a nano hexagonal sheet structure and a thickness of 100-200 nm. The catalyst can be prepared by a one-step solvothermal reaction method. Alkaline-earth metal ions are evenly doped in the nickel iron barium hydrotalcite and are in atomic level dispersion, so that the anode for hydrogen production by electrolysis based on the catalyst, when being applied to a process for hydrogen production by electrolysis of an aqueous solution containing chlorine ions, not only can maintain good catalytic performance, but also has greatly improved chlorine ion corrosion resistance, leading to significant improvement of working stability and service life.

The invention discloses a composite heavy metal adsorbent synthesized through mineral conversion and a preparation method of the composite heavy metal adsorbent, and belongs to the technical field of deep processing of natural nonmetallic minerals and preparation of heavy metal adsorption functional materials, and the main preparation method comprises the following steps: S1, crushing and crushing natural clay minerals, and sieving with a 80-mesh sieve to obtain mineral powder; s2, mixing the obtained mineral powder with a calcium compound, and carrying out ball milling; s3, adding a boron compound, and continuing ball milling; s4, adding water into a solid material obtained by ball milling according to a solid-to-liquid ratio of (1: 5)-(1: 20), putting into a microwave hydrothermal reaction kettle, adding an organic auxiliary agent, carrying out gradient heating to 100-200 DEG C, reacting for 30-120 minutes, then naturally cooling to room temperature, separating, drying and crushing; according to the invention, natural clay raw ore is taken as a raw material, and the borate-silicate composite adsorption material is prepared in a preparation mode of combining solid-phase reaction and microwave hydrothermal treatment, so that high-concentration and low-concentration heavy metal ions are efficiently removed.

The invention relates to the technical field of new energy materials, in particular to a metal oxide heterojunction catalyst and a preparation method and application thereof in hydrogen peroxide production. The preparation method comprises the following steps: taking soluble zinc salt and urea as raw materials, carrying out hydrothermal reaction to obtain zinc oxide, then taking soluble nickel salt and zinc oxide as raw materials, carrying out coprecipitation reaction under the action of ammonium bicarbonate, and calcining in air to obtain the metal oxide heterojunction catalyst. The preparation steps are simple and convenient, the product is prepared in the air atmosphere, in the obtained metal oxide heterojunction catalyst, the surfaces of the zinc oxide microspheres are uniformly coated with the nickel oxide nanosheets, the specific surface area is large, the number of active sites is large, the nickel oxide nanosheets and the zinc oxide microspheres form a heterojunction structure, and the metal oxide heterojunction catalyst has good catalytic activity. The defects of a catalyst for producing hydrogen peroxide through electro-catalysis water oxidation and a preparation method in the prior art are overcome.

The invention discloses a method for preparing a carbon monoxide oxidation catalyst by using titanium gypsum and a waste hydrogenation catalyst, which comprises the following steps: crushing and pickling the waste hydrogenation catalyst, washing with clear water until the waste hydrogenation catalyst is neutral, and drying to obtain pretreated waste catalytic powder; uniformly mixing and stirring titanium gypsum and the pretreated waste catalytic powder to obtain gypsum doped pretreated waste catalytic powder; mixing a plant extract, crop powder and gypsum, doping the pretreated waste catalytic powder, uniformly stirring, feeding into mixed bacteria consisting of bacillus and aspergillus, and fermenting under a stirring condition to obtain a biological activated mixture; adding water into the biological activation mixture for hydrothermal reaction, filtering, separating and washing the material after the hydrothermal reaction is finished, roasting the washed filter cake, naturally cooling the roasted material, and crushing to obtain the carbon monoxide oxidation catalyst. According to the invention, the titanium gypsum and the waste hydrogenation catalyst are combined, and the biomass material is used for activating treatment, so that the use of chemical precursors is reduced, and the oxidation catalyst with excellent catalytic performance is obtained.

The invention discloses a high-entropy metal oxide catalyst as well as a preparation method and application thereof in CO catalytic oxidation, and belongs to the technical field of flue gas treatment. The preparation method comprises the following steps: dissolving copper salt, manganese salt, cerium salt, cobalt salt, vanadium salt and a dispersing agent into water to form a uniform solution, and slowly adding excessive alkali precipitant into the uniform solution to form a solid-liquid mixture; the solid-liquid mixture is transferred into a high-pressure kettle to be subjected to a hydrothermal reaction and then quenched, an obtained hydrothermal reaction product is calcined, and the high-entropy metal oxide catalyst is obtained and is high in catalytic oxidation activity on carbon monoxide at the low temperature, excellent in water resistance and sulfur resistance and particularly suitable for treatment of complex flue gas.

The invention relates to an elementary substance / alloy-metal oxyhydroxide anchored noble metal single atom / cluster heterojunction catalyst. A preparation method comprises the following steps: 1) dissolving a metal salt A, urea and ammonium fluoride in deionized water to obtain a mixed solution B; 2) performing hydrothermal reaction on the mixed solution B and a carrier to obtain a primary sample 1; 3) performing high-temperature calcination on the primary sample 1 in a mixed atmosphere of hydrogen and argon to obtain a primary sample 2; and 4) putting the preliminary sample 2 into a noble metal compound C solution for vacuum impregnation, taking out the sample after impregnation, and drying to obtain the catalyst. According to the scheme, the metal salt A is used as a metal source of a simple substance / alloy, the metal salt A is subjected to hydro-thermal synthesis to form a metal hydroxide and then subjected to high-temperature calcination reduction, the metal salt A is calcined to form the simple substance / alloy, then the simple substance / alloy is soaked in the precious metal compound solution C to form a metal oxyhydroxide, and meanwhile precious metal single atoms / clusters are anchored; the prepared catalyst is high in activity, and the preparation method is simple.

The invention discloses a La < 3 + >-doped lithium manganese oxide lithium ion sieve as well as a preparation method and application thereof, and belongs to the technical field of salt lake lithium extraction. The preparation method comprises the following steps: by taking Mn2O3 and LiOH as raw materials, carrying out hydrothermal reaction to generate LiMnO2, mixing the LiMnO2 with La2O3, grinding and calcining to form a La < 3 + >-doped spinel structure precursor La-LMO, and carrying out acid pickling to prepare La-HMO. La < 3 + > replaces part of Mn < 3 + >, the average valence state of manganese is improved, meanwhile, the structural stability of the manganese is enhanced through the high bond energy of La-O bonds, the number of exposed manganese atoms is reduced, manganese solution loss caused by Mn < 3 + > disproportionation reaction in the acid treatment process is effectively inhibited, the adsorbed oxygen content and active sites are increased, and the lithium ion adsorption capacity is remarkably improved. The material has high-selectivity adsorption capacity on lithium ions in salt lake brine in a strong alkaline environment, the manganese solution loss rate is obviously lower than that of traditional HMO, the cycle life is remarkably prolonged, and the industrial application potential is remarkably improved. The preparation process of the lithium ion sieve is simple, the raw material cost is low, and the technical bottlenecks that an existing manganese-based lithium ion sieve is poor in structural stability and high in manganese solution loss are solved.

The invention relates to a dual-rare earth metal catalytic nano material, a diaphragm and a preparation method and application thereof. The preparation method comprises the following steps: carrying out hydrothermal reaction on an aqueous solution containing a carbon source, a hard template, a graphene oxide dispersion liquid, a nitrogen source, a phosphorus source, cerium salt and neodymium salt; then carrying out centrifugal separation to obtain a precipitate, and generating a precursor containing Ce and Nd rare earth bimetallic modified nitrogen and phosphorus doped graphene coated microspheres; and carrying out chemical etching on the precipitate after heat treatment to obtain the dual-rare earth metal catalytic nano material (HCS-coated NPrGO / CeNd). The HCS-coated NPrGO / CeNd can be used as a modification material of a lithium-sulfur battery diaphragm, not only can catalyze the conversion of polysulfide, but also can inhibit the shuttle effect of the polysulfide, so that the lithium-sulfur battery has relatively high capacity under high-rate charge and discharge, and has relatively low capacity fading rate in a high-rate long-cycle test.

The invention provides a photocatalytic porous composite material for sewage treatment and a preparation method and application thereof, and the preparation method comprises the following steps: dropwise adding an organic ligand solution into a precursor solution composed of a nano cellulose solution and a cobalt source solution, mixing a reaction solution with polyvinyl alcohol, injecting the mixture into a mold, and carrying out directional freezing to obtain an aerogel matrix; carrying out hydrophobic modification on the aerogel matrix to obtain a modified aerogel matrix; the preparation method comprises the following steps: dissolving tetrabutyl titanate and cetyltrimethylammonium bromide in absolute ethyl alcohol, stirring and heating to obtain precursor sol, adding a ferric nitrate solution into the precursor sol for hydrothermal reaction, and filtering and calcining after the reaction is finished to obtain doped titanium dioxide particles; and dispersing the doped titanium dioxide particles in deionized water to obtain a dispersion liquid, and dipping the modified aerogel matrix. According to the invention, a composite material composed of a nanocellulose / ZIF-67 composite aerogel matrix and doped titanium dioxide particles is constructed, and efficient sewage treatment of adsorption-catalysis-regeneration cycle is realized.

The invention discloses a two-dimensional metal oxide composite reduced graphene oxide burning rate catalyst, which is prepared by the following steps: uniformly grinding glucose, ammonium nitrate and transition metal nitrate, calcining at high temperature to generate a two-dimensional metal oxide nanosheet, mixing the two-dimensional metal oxide nanosheet with surfactant modified reduced graphene oxide powder, and sintering at high temperature to obtain the two-dimensional metal oxide composite reduced graphene oxide burning rate catalyst. And transferring into a high-pressure hydrothermal kettle for solvothermal reaction, so that the reduced graphene oxide and the two-dimensional metal oxide nanosheet are compounded to form the composite burning rate catalyst with a 2D-2D structure. Two two-dimensional materials are compounded through a solvothermal method, the defects of accumulation of reduced graphene oxide and aggregation of the two-dimensional metal oxide due to high surface energy are effectively avoided, meanwhile, the high conductivity of the reduced graphene oxide is utilized, the synergistic catalysis effect of the metal oxide and the carbon material is enhanced, and the performance of the composite material is improved. The composite material has a good catalytic effect on the thermal decomposition process of ammonium perchlorate.

The present invention belongs to the technical field of petroleum fracturing production enhancement and modification, and specifically discloses a fracturing fluid pre-fluid for optimizing the size of in-situ autogenous proppant and its application, which is used to solve the problem of small particle size of proppant particles generated by hydrothermal reaction of formation minerals. The fracturing fluid pre-fluid is suitable for calcium-rich reservoirs and is composed of clean water, phosphate, pH regulator and Ca 2+ The chelating agent composition comprises 1 to 10 parts by weight of phosphate relative to 100 parts by weight of clean water, a volume molar concentration of the pH regulator is 1 to 5 mol / L, and Ca 2+ The molar concentration of the chelating agent is 0.001~1mol / L; the pH regulator is urea, ammonia, propionamide, etc. 2+ The chelating agent is EDTA, glutamic acid, etc. The present invention increases the average particle size of proppant particles generated by hydrothermal reaction of formation minerals, thereby improving the supporting effect thereof in micro-fractures of the formation.

The invention belongs to the technical field of nano composite materials, and discloses a novel transition metal-inserted transition metal sulfide composite rare earth oxide photocatalytic material with a solid mediator Z-type heterostructure, and a preparation method and application of the novel transition metal-inserted transition metal sulfide composite rare earth oxide photocatalytic material. The preparation method comprises the following steps: mixing transition metal salt, thioacetamide, nitrate hexahydrate and water to obtain a mixed solution 1; mixing the mixed solution 1 with a hydrazine hydrate solution, and performing hydrothermal reaction to obtain a mixed solution 2; mixing the mixed solution 2 with ammonia water, and sequentially carrying out hydrothermal reaction, drying and calcining to obtain a calcined product; and mixing the calcined product with a sodium borohydride aqueous solution, and drying to obtain the photocatalytic material. The obtained photocatalytic material of the transition metal inserted transition metal sulfide composite rare earth oxide with the solid mediator Z-type body heterostructure has the characteristics of high stability, safe interface contact and rapid charge migration.

The invention discloses a preparation method of CoWO (cobalt tungsten oxide) modified NbOp-n heterojunction NbO5 / CoWO photocatalyst powder. The preparation method comprises the following steps: dissolving cobalt salt and tungsten salt in deionized water, stirring and mixing, carrying out hydrothermal reaction in an autoclave, washing and drying to obtain CoWO powder; the preparation method comprises the following steps: dissolving niobium oxalate and ammonium carbonate in deionized water, adding CoWO powder, carrying out a hydrothermal reaction in an autoclave, and carrying out washing and drying treatment to prepare NbO / CoWO photocatalyst powder. According to the method, the hydrothermal reaction temperature is regulated and controlled, and the mass ratio of raw materials is optimized, so that the catalyst forms a p-n heterojunction structure of NbOmicron flower loaded CoWOnano particles. The prepared catalyst has high norfloxacin wastewater degradation efficiency under visible light irradiation, has the advantages of simple preparation process, low reagent cost, high catalytic activity and good structural stability, and can be effectively applied to purification treatment of antibiotic polluted water.

The invention discloses a method for synthesizing a Mn0. 43Cd0. 57S / Cu2MoS4 photocatalyst by adopting a solvothermal method, and belongs to the technical field of catalysts. The preparation method comprises the following steps: preparing copper molybdenum sulfide by using cuprous oxide as a template, synthesizing copper molybdenum sulfide with high purity and good crystallinity by combining a solvothermal method, preparing manganese cadmium sulfide by using manganese acetate, cadmium acetate, sodium hydroxide and thioacetamide as raw materials, adding copper molybdenum sulfide before a hydrothermal reaction, successfully modifying the manganese cadmium sulfide by constructing a heterojunction, and preparing the copper molybdenum sulfide modified manganese cadmium sulfide. The Mn0. 43Cd0. 57S / Cu2MoS4 photocatalyst is synthesized, and the photocatalytic hydrogen production rate of the cadmium manganese sulfide is improved. Moreover, the hydrogen production rate of the Mn0. 43Cd0. 57S / Cu2MoS4 photocatalyst prepared by the invention can reach 8233 mu mol / (g.h), which is 2.08 times of the hydrogen production rate of pure cadmium manganese sulfide, and 1.24 times of the hydrogen production rate of cadmium manganese sulfide loaded with 1% platinum.

The invention belongs to the technical field of water electrolysis hydrogen production catalysts, and particularly relates to a preparation method and application of a bimetallic phosphide coupling layered double hydroxide electrocatalyst. The preparation method comprises the following steps: by taking a nickel source, an iron source, ammonium fluoride and urea as reactants, carrying out hydrothermal reaction to form a nickel-iron layered double hydroxide nano-catalyst precursor on a conductive substrate; and carrying out phosphating treatment on the nickel-iron layered double hydroxide nano-catalyst precursor by an electrodeposition method to obtain the bimetallic phosphide coupled layered double hydroxide electrocatalyst. Under the 1M potassium hydroxide solution test condition, the overpotential required by the catalyst is 89 mV when the current density in a linear scanning voltammetry curve is 10 mA cm <-2 >, and the catalyst is high in stability, simple in manufacturing process, energy-saving, suitable for industrial application and capable of being used for large-scale water electrolysis hydrogen production.

The invention discloses a preparation method of a nickel-based catalyst and the nickel-based catalyst. The preparation method of the nickel-based catalyst comprises the following steps: S1, completely dissolving an acid source, cerium salt and a solvent; s2, carrying out hydrothermal reaction on the solution obtained in the step S1; s3, carrying out solid-liquid separation on the product obtained in the step S2, and washing, drying and calcining the obtained solid product to form a carrier which is cerium dioxide derived from a metal organic framework; s4, an active component is loaded on the carrier, and the active component is metallic nickel or nickel oxide. According to the preparation method of the nickel-based catalyst, the nickel-based catalyst with relatively high specific surface area and developed mesoporous channels can be prepared, thermal agglomeration of active sites of metal nickel can be avoided, and the stability and catalytic performance of the nickel-based catalyst are improved.

The invention discloses a preparation method and application of octahedral cuprous oxide containing defects, and belongs to the technical field of material preparation. In order to solve the problems that in existing cuprous oxide preparation, a defect structure is difficult to accurately regulate and control, and the crystal form uniformity is insufficient, the method comprises the steps that a copper source solution, a glucose solution, a sodium citrate solution and an ammonium fluoride solution with specific concentrations are mixed according to the volume ratio, the pH is adjusted to 10.5-11, then a hydrothermal reaction is conducted, and a target product is obtained through centrifugation, filtration, washing and drying. The method comprises the following specific steps: mixing solutions, reacting in a high-pressure reaction kettle at 140-165 DEG C for 4-6 hours, and realizing octahedral crystal form construction and defect regulation and control by controlling the raw material ratio and reaction conditions. The preparation method is simple in process and high in controllability, and the prepared octahedral cuprous oxide containing defects can serve as a catalyst to be applied to the fields of catalytic decomposition of ammonium perchlorate and the like and has good industrial application prospects.