32results about How to "Improve adsorption strength" patented technology

The invention is suitable for the technical field of OER catalysts, and provides a preparation method of a nanowire array composed of a ferrocobalt-based heterostructure, and the preparation method comprises the following steps: pretreating a foamed nickel substrate; performing in-situ growth of a precursor CoFe-LDH nanosheet on the NF through a hydrothermal method; and synthesizing the nanowire array composed of the ferrocobalt-based heterostructure: putting a precursor into a muffle furnace, heating, keeping the temperature so that the precursor is thoroughly converted into a Co-Fe-O intermediate, immersing NF on which the intermediate grows into a polytetrafluoroethylene reaction kettle lining, carrying out a hydrothermal reaction, and naturally cooling to the room temperature to obtain a Co9S8-Fe3O4 / VNF composite material (the vulcanized NF is abbreviated as VNF), so that the nanowire array composed of the ferrocobalt-based heterostructure and the Co9S8-Fe3O4 / VNF composite material is obtained. The nanowire array is composed of a ferrocobalt-based heterostructure. The invention further provides a nanowire array composed of the ferrocobalt-based heterostructure and application of the nanowire array in preparation of a working electrode of an oxygen evolution reaction catalyst. According to the heterostructure catalyst provided by the invention, the adsorption strength of an OER intermediate can be optimized to realize high intrinsic OER activity, and efficient and stable water decomposition is realized.

The invention relates to the technical field of fertilizers, and particularly discloses a biological fertilizer water retention agent, a preparation method thereof and a compound fertilizer. The preparation method of the biofilm fertilizer water retention agent comprises the following steps: preparing loaded microorganisms; adding polyglutamic acid and glucan into water, uniformly stirring, adjusting the temperature of the system to 50-70 DEG C, cooling, adding the loaded microorganisms, and uniformly mixing to obtain a premix a; adding cross-linked carboxymethyl cellulose and silica fume into the premix a, and uniformly mixing to obtain a premix b; and uniformly mixing guar gum, polyvinyl alcohol and carboxymethyl cross-linked dextran gel, adjusting the water content of the system, stirring, cooling, adding into the premix b in a stirring state, stirring, and carrying out post-treatment to obtain the biofilm fertilizer water retention agent. The invention discloses a compound fertilizer and a preparation method thereof. Through the synergistic effect of various effective components, the water-retaining and fertilizer-retaining capacities of soil are improved, and the water-retaining and fertilizer-retaining agent is used for compound fertilizers, promotes plant growth and is suitable for large-scale popularization and application.

The invention belongs to the technical field of crucible manufacturing, and particularly relates to a composite ultra-high-temperature quartz crucible and a preparation method thereof.The composite ultra-high-temperature quartz crucible is prepared from 10-12 parts of a main body mixture, 0.5 part of an inner coating material and 2-3 parts of an outer substrate material; high-purity quartz sand is treated under an alkaline condition to obtain hydroxylated quartz sand, the hydroxylated quartz sand reacts with a silanol solution to obtain condensed quartz sand, high-purity graphite powder and high-purity carbon powder are further added, oxygen of the condensed quartz sand is partially substituted, composite quartz sand rich in Si-O-Si bonds and Si-C bonds is obtained, the high-purity silicon powder serves as a substrate, high-purity silicon nitride is introduced, and the composite quartz sand is prepared. The main body mixture is prepared to improve the overall temperature resistance and thermal shock resistance of the material; an inner coating material is arranged on the inner layer, so that the material is prevented from being corroded; the outer substrate material is arranged on the periphery, so that the overall strength and toughness of the quartz crucible are enhanced, and corrosion of the external environment to the quartz crucible is resisted.

The invention provides a cleaning solution for a semiconductor chip after CMP and a preparation method and application thereof. The cleaning solution for the semiconductor chip after CMP comprises the following components in parts by weight: 1-10 parts of an additive; 1-7 parts of a corrosion inhibitor; 1-10 parts of an organic base; 80 to 90 parts of ultrapure water; preferably, the additive is N-(9-((1R, 3R, 4R, 7S)-1-((bis (4-methoxyphenyl) (phenyl) methoxyl) methyl)-7-hydroxy-2, 5-dioxabicyclo [2.2. 1] heptane-3-yl)-9H-purine-6-yl) benzamide. The invention also relates to a preparation method of the pharmaceutical composition. The cleaning solution for the semiconductor chip after CMP is safe, environmentally friendly and efficient, does not corrode the semiconductor chip, can complete cleaning under the pure soaking process condition without cooperation of an ultrasonic process, and has very good application prospects and large-scale industrial popularization potential in the field of semiconductor chip cleaning.

The invention discloses a preparation method and application of a high-entropy catalyst tellurium-selenium tungsten molybdenum sulfide, and belongs to the technical field of energy materials, the preparation method comprises the following steps: adding selenium powder into a hydrazine hydrate solution to form a solution A; dissolving sodium molybdate dihydrate, tungsten chloride and thiourea in the reduced graphene oxide suspension to form a mixed solution B; the solution A and the solution B are mixed together and stirred to obtain a solution C, and the solution C is transferred into a high-pressure kettle for a hydrothermal reaction; washing a product obtained by the reaction with deionized water, and freeze-drying after washing to obtain a black product A; and putting the product A at a leeward position of a tubular furnace, putting tellurium powder at a windward position of the tubular furnace, and performing annealing treatment in an argon-hydrogen environment to obtain the tellurium-selenium tungsten-molybdenum sulfide catalyst. According to the preparation method and application of the high-entropy catalyst tellurium selenium tungsten molybdenum sulfide, rapid transmission of electrons is facilitated, the transmission efficiency of ions and electrons is improved, and the dynamic performance of a battery is enhanced.

The invention relates to the technical field of box body materials, in particular to a box body material and a preparation method and application thereof to a box body, by preparing a modified damping agent and a modified flame retardant and adding a degradable polymer into the modified damping agent and the modified flame retardant, when the box body material is applied to a sound box shell, the damping effect of the sound box shell can be well guaranteed; the environment-friendly, non-toxic and harmless box shell can be guaranteed, non-toxic and harmless treatment in the box body raw material preparation process is achieved, polyethylene glycol diacrylate and maleic anhydride grafted polyethylene are mixed, poisonous and harmful gas generated in the maleic anhydride grafted polyethylene can be effectively adsorbed during high-temperature treatment, and the environment-friendly, non-toxic and harmless box shell is obtained. The dispersity of the internal toxicity of the maleic anhydride grafted polyethylene is reduced; polycarbonate and polyethylene terephthalate are weighed in parts by weight, and are added into a high-speed mixer together with styrene butadiene rubber and ethylene-propylene copolymer, so that when the prepared box body material is applied to the sound box shell, the high-damping, high-flame-retardant and environment-friendly effects can be ensured.

The utility model discloses a seamless connection type LED light bar, which belongs to the technical field of LEDs and comprises a mounting plate and an LED light body, the bottom surface of the LED light body is mounted on the top surface of the mounting plate, two end surfaces of the mounting plate are respectively welded with a fixing plate and a plug board, one side of the fixing plate far away from the mounting plate is fixedly connected with two plug rods through grooves, and the plug rods are fixedly connected with the mounting plate through the grooves. The side face of the inserting rod is sleeved with a fixed magnetic ring, the side face of the fixed magnetic ring is connected with a movable magnetic ring in a magnetic attraction mode, movable sleeves are welded to the side face of the movable magnetic ring, the inner side walls of the movable sleeves are connected with the inserting rod in an inserting mode, the end faces of the two movable sleeves are welded to an inserting plate, and the side face of the inserting plate is fixedly connected with two second metal sheets through formed grooves. According to the LED lamp strip, the phenomenon that when the LED lamp strip is assembled and connected, external dust flows into the LED lamp strip through a connecting gap, and consequently circuit elements of the LED lamp strip are short-circuited and damaged is avoided, and the service life of the LED lamp strip is prolonged.

This invention discloses an easy-to-operate new energy charging pile, belonging to the field of new energy charging piles. It includes a charging pile and a charging gun. A fixed cylinder is fixedly installed on the charging pile, and a fixed component is provided on the charging gun. An adjustment component is provided inside the charging gun. The fixed component includes a handle fixedly installed on the charging gun, an elastic cylinder fixedly installed on the charging gun, and a fixed plate fixedly installed on the elastic cylinder. A connecting component is installed between the fixed plate and the charging gun. A plug is slidably installed through the fixed plate, and a cylinder is fixedly installed on the plug. This design allows the operator to adaptively adjust the tilt angle of the plug according to needs. Simultaneously, the pushing component effectively ensures that the plug on the charging gun remains parallel to the charging port during insertion or removal, improving contact and effectively reducing mechanical wear.

This invention relates to the field of mineral processing flotation reagents, specifically disclosing a high-efficiency collector for the flotation of sphalerite and its preparation method. The high-efficiency collector provided by this invention achieves synergistic enhancement of the functions of each component by compounding isopropyl xanthate, dialkyl dithiocarbamate, and mercaptoacetate, and introducing a designed and synthesized polymeric synergist. The three basic collector components together constitute a dense and stable primary hydrophobic adsorption layer. The introduced synergist, on the one hand, enhances the adsorption strength and selectivity on the surface of sphalerite through multiple functional groups; on the other hand, its grafted hydrophilic polymer chains can form steric hindrance at the mineral-water interface and regulate local hydrophilicity and hydrophobicity, thereby further optimizing the hydrophobic state of the mineral surface and inhibiting gangue inclusions. The composite reagent provided by this invention improves the recovery rate of useful minerals while ensuring concentrate quality.

The utility model discloses a mercury-containing flue gas pre-filtering device, which relates to the technical field of gas purification and comprises a base and a bottom plate, a collecting box and an adsorbent tank are fixed on the top of the base through a support, the top of the collecting box is communicated with an absorption chamber through a flow guide pipe, and the top of the adsorbent tank is communicated with a lifting pipe through a lifting pump. An electromagnetic valve is installed on the surface of the flow guide pipe, a stirring paddle is installed in the absorption chamber in a penetrating mode, a primary filtering structure is welded to the top of the bottom plate, and a pumping and draining structure is detachably connected to the top of the primary filtering structure. According to the utility model, the mercury-containing flue gas can be primarily filtered and repeatedly adsorbed and filtered by arranging a filtering mode of combining the primary filtering structure and the repeated filtering structure, and an adsorbent in the absorption chamber can be scattered and stirred for multiple times by arranging the stirring paddle capable of continuously rotating in the absorption chamber, so that the adsorption efficiency is improved. The adsorbent is in full contact with the mercury-containing flue gas, so that the adsorption strength of the adsorbent on the mercury-containing flue gas is improved.

The present application relates to a kind of refractory dispersant and its preparation method in the technical field of refractory additive, it is the comb structure copolymer, the copolymer includes styrene-maleic anhydride copolymer main chain, polyethylene glycol side chain grafted on the styrene-maleic anhydride copolymer main chain by ester bond, and phosphate radical;The polyethylene glycol side chain includes short-chain polyethylene glycol with molecular weight of 400-600 and long-chain polyethylene glycol with molecular weight of 800-1200.The present application realizes the precise division of function by using asymmetric compound polyethylene glycol side chain of specific molecular weight range, and controls esterification grafting degree is 50%-85%, not only can provide excellent initial wetting and dispersion force, ensure that slurry has excellent construction fluidity, but also can effectively prevent particle re-aggregation and sedimentation under static or shear, so as to fundamentally solve the technical problem that traditional dispersant is difficult to consider high initial fluidity and long-term anti-settling property, plasticity.

This invention relates to the field of water treatment technology, specifically to a method for adsorbing heavy metals in copper-containing wastewater. The method includes: preparing a modified chitosan composite material; preparing a composite fiber filter membrane; preparing composite hydrogel microspheres; and treating the copper-containing wastewater. This invention first dissolves chitosan and mixes it with nano-ferric oxide to form a physical coating, imparting magnetic responsiveness to the chitosan. Then, it modifies the chitosan using 1,3,5-phenyltricarboxylic acid and triethylenetetramine. A three-dimensional network cross-linked structure is constructed by reacting glutaraldehyde with the amino groups of chitosan and triethylenetetramine to produce modified chitosan. Finally, graphene oxide is loaded onto the surface and pores of the modified chitosan through impregnation and drying to obtain a modified chitosan composite material. When this material is added to pretreated wastewater, it can significantly improve the adsorption capacity for copper ions in copper-containing wastewater.

The present invention provides a catalyst based on carbon-supported niobium-based bimetallic nitrogen oxides and a preparation method and application thereof, which relates to the technical field of fuel cells. The method comprises: dissolving a niobium salt and another transition metal salt in water or an alcohol solution to prepare a precursor solution; uniformly dispersing a carbon carrier in the precursor solution, filtering and drying to obtain a precursor; calcining the precursor with a nitrogen source to obtain a carbon-supported niobium-based bimetallic nitrogen oxide catalyst. The niobium-based bimetallic nitrogen oxide nanoparticles prepared by the present invention are uniformly distributed and have a small particle size, which is conducive to exposing a large number of active sites. The carbon loading makes it have good electrical conductivity. These advantages make it suitable for use in fuel cell catalysts and are conducive to improving the current density of the catalyst. The catalyst has a bimetallic component, which is not only acid-resistant, but also has a rich and adjustable d electronic structure, which can optimize the adsorption strength of the reaction species and obtain excellent catalytic performance.

The invention discloses a recoverable quasi-interpenetrating network foam fracturing fluid which comprises the following components in percentage by mass: 2-4% of a multi-effect agent, 0.1-2% of a thickening aid, 1-2% of a clay stabilizer, 0.5-2.5% of an iron ion stabilizer, 0.05-0.5% of an enhancer and the balance of water, the multi-effect agent is selected from one or a mixture of more of cocamidopropyl dimethylamine, oleamide propyl dimethylamine, fatty acid amide propyl dimethylamine and erucamide propyl dimethylamine; under the stimulation of CO2, the multi-effect agent obviously reduces the surface tension of the fracturing fluid base fluid, improves the foaming capacity of the foam fracturing fluid, can form wormlike micelles in the base fluid, and greatly improves the stability of foam. The reinforcer is modified nano cellulose, can form hydrogen bonds with the multi-effect agent on an interface, improve the adsorption density of the multi-effect agent and reinforce the foaming capacity, and can also form a quasi-interpenetrating network structure with the wormlike micelles in a liquid film to further improve the stability and the sand-carrying capacity of the foam fracturing fluid, and the foam fracturing fluid can be recycled for multiple times.

The invention discloses a paper feeding front edge servo downdraft type pressure-free constant-speed paper feeding printing slotting die-cutting machine which comprises two mounting plates arranged in parallel, a same shaft is rotationally mounted between the two mounting plates, the two ends of the shaft penetrate through the two mounting plates correspondingly, a servo motor is fixedly mounted on the inner side of any one mounting plate, and a servo motor is fixedly mounted on the inner side of any one mounting plate. The output end of the servo motor penetrates through the mounting plate and is provided with a cam, a swing rod fixedly connected to the shaft in a sleeving mode is arranged above the cam, and the swing rod is matched with the cam; a plurality of clamping blocks are installed on the shaft, the clamping blocks are connected with connecting rods through first joint fulcrums, a front edge air suction box is arranged between the two installation plates, a first lip plate is arranged at the top of the front edge air suction box, and the connecting rods are connected to the first lip plate through the first joint fulcrums. The servo motor drives the cam to rotate to accurately control the lip plate to rise and fall, and the adsorption strength is improved, so that the effects of pressure-free paper feeding and constant-speed paper feeding are achieved, and the production efficiency and the production quality are improved.

The invention discloses a composite Chinese medicine preparation for chronic osteomyelitis, and its raw materials include: Wuwei Xiaoduyin extractant, sodium alginate, p-toluenesulfonic acid, cyclodextrin, 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, emulsifier, chitosan, sodium chloride, calcium chloride; the mass ratio of Wuwei Xiaoduyin extractant, sodium alginate, p-toluenesulfonic acid, cyclodextrin, 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, emulsifier, chitosan, sodium chloride, and calcium chloride is 10-20: 1-3: 0.1-0.2: 2-8: 0.01-0.1: 0.1-0.2: 1-2: 0.1-0.2: 0.1-0.2. The invention also discloses a preparation method of the composite Chinese medicine preparation for chronic osteomyelitis. The present invention can not only solve the disadvantage that antibiotics are difficult to penetrate into the bone to form an effective antibacterial concentration, but also the method is easy to implement, simple to prepare, and convenient to use.

The present invention provides a medical equipment mobile inspection robot, including a main box, the main box includes an upper cabinet, a lower cabinet and a mobile base, a mechanical arm operation component includes a mechanical arm, a back adjustment component and a constraint sleeve, the back adjustment component is installed in the upper cabinet, the inner end of the mechanical arm is installed in the back adjustment component, the outer end of the mechanical arm is rotatably connected to the constraint sleeve, the inner rotation of the constraint sleeve is installed with a touch demonstration component, the bottom of the touch demonstration component is connected to the screen maintenance component, the screen maintenance component is built-in with a screen disinfection module and a maintenance prompt module, the maintenance prompt module is built-in with multiple groups of warning plates; the mobile base is built-in with a cleaning mechanism. During the day, the present invention can collect images around the all-in-one machine, which is convenient for the backstage personnel to supervise. When the backstage personnel find that the equipment is abnormal, they can go to deal with it in time; and during the inspection process, the cleaning mechanism can also clean the ground to ensure that the ground is clean. At night, medical equipment can be detected one by one and abnormal equipment can be marked.

This invention discloses a hierarchical guanidine resin-based CO2 adsorbent material and its preparation method, belonging to the field of polymer synthesis technology. The adsorbent material prepared by this invention has a composite spherical structure and a hierarchical pore structure, including micropores, mesopores, and macropores. By introducing a hierarchical pore structure, the adsorption capacity of the material for CO2 is effectively improved. The introduction of hierarchical pores can significantly reduce molecular diffusion resistance and increase the contact area between the adsorbent and CO2 molecules, thereby achieving rapid adsorption. Furthermore, pyridyl, polyamino compounds, and guanidine groups have strong basicity and chemical affinity for CO2. Through surface functionalization modification, the number of active sites on the material surface is significantly increased, thereby further improving the CO2 adsorption capacity and selectivity.

The present invention relates to the technical field of concrete early strength agent, and specifically discloses an antifreeze type ultra-high performance concrete early strength agent, wherein the raw materials include by mass: 10-15 parts of polypropylene, 1-2 parts of maleic anhydride grafted polypropylene, 1-4 parts of sodium chloride, 5-10 parts of polyethylene, 1-2 parts of sodium polyacrylate, 1-2 parts of aluminum chloride, 4-10 parts of diethanolamine, 1-6 parts of triisopropanolamine, 1-2 parts of sodium sulfate, 1-2 parts of silica sol, 1-2 parts of methyl orthosilicate, 1-2 parts of calcium formate, 1-2 parts of aluminum sulfate, 10-20 parts of composite water reducer, and 0.1-1 parts of defoamer. The present invention also discloses a preparation method of the above-mentioned antifreeze type ultra-high performance concrete early strength agent. The present invention also discloses the application of the above-mentioned antifreeze type ultra-high performance concrete early strength agent.

This disclosure provides an array-distributed UTG glass suction cup, relating to the technical field of glass suction cup equipment. It includes a suction cup assembly, a negative pressure diversion assembly, a buffer guide rod, a guide rod limiting block, a buffer spring, and a buffer mounting plate. Inner negative pressure pipes are installed on several suction cup holes on the inner ring of the suction cup assembly, and outer negative pressure pipes are installed on several suction cup holes on the outer ring of the suction cup assembly. The negative pressure diversion assembly communicates with the several negative pressure pipes. The buffer guide rod is vertically fixed on the upper surface of the suction cup assembly. The buffer mounting plate is parallel to the upper part of the suction cup assembly, and the buffer guide rod passes through the buffer mounting plate. The buffer mounting plate can slide along the axial direction of the buffer guide rod. The buffer spring is sleeved on the buffer guide rod and located between the suction cup assembly and the buffer mounting plate. The guide rod limiting block is fixedly installed on the upper side of the buffer guide rod and above the buffer mounting plate. This solution can achieve stable adsorption of glass material.

This invention discloses a functionalized MXene-supported metal oxide catalytic material, its preparation method, and its applications. The preparation method includes: fully contacting a pretreated metal substrate with a liquid-phase system containing MXene and metal ions and reacting at high temperature, followed by annealing in air to obtain the MXene-supported metal oxide material; and then subjecting it to electrochemical or chemical treatment to obtain the functionalized MXene-supported metal oxide catalytic material. In the functionalized MXene-supported metal oxide catalytic material of this invention, electron transfer occurs between the functionalized MXene and the metal oxide, promoting the formation of more active sites in the metal oxide that are conducive to catalyst-reactant electron exchange, thereby improving the activity of the oxygen evolution reaction (OER). Simultaneously, the functionalized MXene has abundant surface groups, which can generate strong chemical interactions with the metal oxide, improving the stability of the metal oxide in acidic media.

The invention discloses a paper feeding front edge servo downdraft type pressure-free paper feeding servo printing slotting die-cutting machine which comprises two mounting plates arranged in parallel, a same shaft is rotatably mounted between the two mounting plates, the two ends of the shaft penetrate through the two mounting plates respectively, a servo motor is fixedly mounted on the inner side of any one mounting plate, and a servo motor is fixedly mounted on the inner side of any one mounting plate. The output end of the servo motor penetrates through the mounting plate and is provided with a cam, a swing rod fixedly connected to the shaft in a sleeving mode is arranged above the cam, and the swing rod is matched with the cam; and a plurality of clamping blocks are mounted on the shaft. According to the invention, in the high-speed running process of paper feeding, printing, slotting and die cutting, the front edge air suction lip plate is automatically controlled to rise and fall, so that the paper feeding speed is constant, the printing is uniform and attractive, the paper feeding speed is high, the quality is good, the cost is saved to the maximum extent, the working quality is improved, and the compressive strength of a paperboard is prevented from being damaged.

The application discloses a formaldehyde and carbon dioxide combined adsorbent, which is a solid porous material, and the effective component of the formaldehyde and carbon dioxide combined adsorbent is aluminum-doped hexagonal boron nitride. The formaldehyde and carbon dioxide combined adsorbent can simultaneously adsorb two harmful gases of formaldehyde and carbon dioxide, has the characteristics of high adsorption efficiency and high adsorption strength, and is especially suitable for use in newly decorated rooms, so that the indoor air purification effect is improved.

The rubber vulcanization device for production comprises a base, two sets of stroke devices are symmetrically arranged at the top of the base, the stroke devices are fixedly connected with a press-fit vulcanization device, the stroke devices are fixedly connected with an adsorption structure, and a storage box is arranged at the bottom of the adsorption device. The press-fit vulcanizing device comprises a lower mold and an upper mold, the middle position of the top of the upper mold is fixedly connected with the output end of a hydraulic cylinder, the hydraulic cylinder is fixedly connected with the middle position of the top of a supporting table, and the bottom of the supporting table is fixedly connected with a base. However, vulcanized rubber has certain harm to a human body, so that automatic production needs to be realized.

The application belongs to the technical field of clay stabilizer preparation, and particularly relates to a clay stabilizer and a preparation method thereof. The clay stabilizer is composed of the following raw materials: 1-ethyl-3-vinylimidazolium bromide, [3-(dodecyloxy)-2-hydroxypropyl] di(2-hydroxyethyl) methylammonium methyl sulfate, 3-{(dimethyl(3-trimethoxysilyl)propyl)ammonium} propane-1-sulfonate, polyallylamine hydrochloride, glycerophosphorylcholine, lauryl alcohol polyoxyethylene polyoxypropylene ether, glacial acetic acid, and the balance is deionized water. The clay stabilizer has excellent permeability and anti-swelling rate due to the synergistic effect between the raw materials.

The invention discloses a dead pig eyeball fixing device based on a cornea valve making experiment, the dead pig eyeball fixing device comprises a base and a fixing block arranged on the base, the end face of the fixing block is provided with a containing hole used for containing an external dead pig eyeball, the base is movably provided with a moving plate, the moving plate is detachably provided with a glass slide, and the glass slide is provided with a fixing hole used for fixing the dead pig eyeball. The adsorption part is used for generating negative pressure adsorption force in the containing hole to fix the dead pig eyeballs, and the synchronizing part is used for being in linkage with the adsorption part to enable the moving plate to slide towards the dead pig eyeballs when the adsorption part operates and enable the glass slide to flatten the cornea surfaces of the dead pig eyeballs. The dead pig eyeball fixing device solves the problems that a traditional dead pig eyeball fixing device is too low in dead pig eyeball fixing strength, and a glass slide needs to be manually moved after the dead pig eyeball is fixed.

The invention discloses a preparation method of a dual-mechanism oxygen evolution reaction spinel oxide electrocatalyst based on a strategy of partially filling oxygen vacancies with anions, and relates to a preparation method of an oxygen evolution reaction spinel oxide electrocatalyst. The technical problems that an existing pure spinel oxide is low in catalytic efficiency and unstable in structure are solved. The preparation method comprises the following steps: 1, preparing a self-supporting spinel oxide electrode material; 2, preparing a self-supporting oxygen vacancy enriched spinel oxide electrode material; 3, preparing a self-supporting oxygen vacancy part anion filling type catalyst; according to the invention, an oxygen vacancy-anion partial filling strategy is utilized to regulate and control the local structure and the electronic state of the spinel oxide. The overpotential of the prepared Co3O4-VO-S / NF catalyst in 1.0 M KOH at the current density of 50 mA cm <-2 > is as low as 301 mV, and the Co3O4-VO-S / NF catalyst can stably run for more than 120 hours and can be used in the field of hydrogen production by water electrolysis.

The invention discloses a P-type heavy doping chemical potential regulation and control growth method of 4H-SiC. The method comprises the following steps: providing a SiC substrate; carrying out pretreatment on the SiC substrate; introducing a source gas so as to grow a P-type heavily doped 4H-SiC epitaxial layer on the surface of the pretreated SiC substrate; the source gas comprises C source gas, Si source gas and P-type doped source gas; in the growth process of the 4H-SiC epitaxial layer, the 4H-SiC epitaxial layer begins to grow from the C-rich atmosphere, and the SiC substrate is periodically in the C-rich atmosphere and the Si-rich atmosphere; the C-rich atmosphere is used for reducing the adsorption formation energy of P-type doped atoms and improving the adsorption strength of the 4H-SiC epitaxial layer on the surface of the SiC substrate; and the Si-rich atmosphere is used for enhancing the bonding ability between the adsorbed P-type doping atoms and SiC crystal molecules and increasing the growth speed of the 4H-SiC epitaxial layer. According to the invention, rapid and uniform growth of the epitaxial layer can be realized.

The invention provides a perovskite organic metal framework composite material and a preparation method thereof, and the preparation method comprises the following steps: preparing a perovskite precursor by adopting a sol-gel method, and calcining the perovskite precursor to obtain a perovskite material; preparing an organic metal framework material by adopting a hydrothermal method; the preparation method comprises the following steps: dissolving a perovskite material and an organic metal framework material in a methanol solution, uniformly mixing, stirring at room temperature, and filtering to obtain the perovskite organic metal framework composite material. The invention further provides a combined cycle system of the perovskite organic metal framework composite material, the perovskite organic metal framework composite material is obtained and used for adsorbing ammonia gas and organic pollutants, and the adsorption effect of the perovskite organic metal framework composite material is better than that of an organic metal framework. The perovskite is loaded on the organic metal framework, so that the advantages of the organic metal framework are reserved, and meanwhile, the price of the organic metal framework is reduced.

The invention provides a wall surface adsorption device which can improve the safety and reliability of wall surface operation. The wall surface adsorption device comprises a carrying mechanism used for driving the wall surface adsorption device to move; the adsorption assembly is borne on the carrying mechanism, and the adsorption assembly is used for being adsorbed to the wall surface; the push rod assembly is connected with the carrying mechanism and arranged on the side, away from the wall face, of the adsorption assembly in the first direction, the push rod assembly can push the adsorption assembly to move in the first direction, and the first direction is parallel to the normal vector of the wall face.