713 results about "Oxygen rich" patented technology

The invention discloses raw water filtering equipment and process for processing oxygen-enriched mineral water, and relates to the technical field of filtering equipment. When raw water of mineral water is filtered, impurities in the water are generally filtered out by adopting a filter bag, and when the filter bag is used, the impact of the raw water on the filter bag cannot be buffered, so that the gap of the filter bag is enlarged or the filter bag is broken, and the normal operation of filtering is influenced. Through the sliding fit between the sliding sleeve ring and the outer sliding cylinder and the elastic deformation of the elastic backing ring, when the instantaneous leading-out amount of raw water is large and the acting force for obliquely impacting the filter bag downwards is large, the impact force is transmitted to the sliding sleeve ring through the filter bag, so that the sliding sleeve ring compresses the elastic backing ring to deform, the sliding sleeve ring slides downwards, the impact force is buffered, and the service life of the filter bag is prolonged. The problems that the impact force borne by the filter bag during filtering cannot be buffered, the filter bag is broken, and raw water cannot be filtered are avoided.

The invention discloses a low-cost hydrogen embrittlement-resistant titanium bipolar plate for an electrolytic bath and a preparation method of the low-cost hydrogen embrittlement-resistant titanium bipolar plate. The low-cost hydrogen embrittlement-resistant titanium bipolar plate comprises a surface-modified titanium base material, an in-situ hydrogen-resistant layer formed on the surface of the titanium base material, and a noble metal conductive layer prepared on the surface of the in-situ hydrogen-resistant layer, the surface roughness Ra value of the titanium base material subjected to surface modification is 2-3.5 microns; the in-situ hydrogen-resistant layer is a titanium oxide layer or an oxygen inclusion layer which is generated on the surface of the titanium substrate in situ in an air atmosphere or an oxygen-enriched atmosphere, and the thickness of the in-situ hydrogen-resistant layer is 50-200nm; the precious metal conducting layer is made of at least one of platinum, gold, iridium and palladium, and the thickness of the precious metal conducting layer is 20-150 nm. Through simple surface modification and in-situ generation of the hydrogen-resistant layer, the method has the advantages of high process maturity, low process complexity, low material cost and great cost advantage.

The present invention belongs to the field of material preparation, and discloses a preparation method and application of a composite material of Pd, cerium oxide and silicon dioxide with a controllable hierarchical catalytic structure. Cerium oxide rich in oxygen vacancies is used as a carrier, and Pd species are loaded by impregnation, and then dispersed on the surface of acidic silicon dioxide with a high specific surface area. Finally, a Pd / CeO2 / SiO2 material with a controllable hierarchical catalytic structure is prepared by high-temperature calcination and reduction, and is used to catalyze the hydrogenation conversion reaction of furfural. The preparation method of the present invention is simple, green and environmentally friendly, highly active, stable, cheap and easy to obtain, and can efficiently catalyze the hydrogenation conversion of furfural, and has good industrial application prospects.

The invention belongs to the field of coal quality analysis, and discloses a microwave heating type coal quality on-line analysis device and application thereof.The device comprises an on-line sample collecting and preparing module, a microwave heating module, a weight collecting module and an analysis control module, and the microwave heating module comprises a microwave drying cavity, a microwave devolatilization cavity and a microwave ashing cavity; each chamber is connected with a microwave temperature control unit for independent temperature control; the online sampling and sample preparation module is used for collecting coal from a coal conveying line in real time, crushing the coal into standard coal samples, and feeding the standard coal samples into the corresponding treatment chambers for microwave heating treatment; the microwave ashing cavity is further connected with an oxygen supply unit, and the oxygen supply unit is used for providing an oxygen-enriched environment for the microwave ashing cavity; the weight acquisition module is connected with the analysis control module and is used for acquiring the weight of the standardized coal sample before and after heating; and the analysis control module is used for controlling the microwave temperature control unit to adjust the temperature of the corresponding chamber and obtain various indexes of the standardized coal sample. According to the invention, the efficient and full-automatic microwave heating coal quality online sampling analysis effect can be realized.

The invention discloses a comprehensive recycling system for waste gas of a pressure swing adsorption nitrogen making device. The comprehensive recycling system comprises an air compressor, a refrigerated dryer, a first filter, a drying tower unit, a second filter, an air storage tank, an adsorption tower unit and a nitrogen storage tank which are sequentially connected through a pipeline, the drying tower unit comprises drying towers arranged in parallel, the inlet ends of the drying towers are connected with the first filter, and the outlet ends of the drying towers are connected with the second filter; the adsorption tower unit comprises adsorption towers arranged in parallel, the inlet ends of the adsorption towers are connected with an air storage tank, the outlet ends of the adsorption towers are connected with a nitrogen storage tank, and the nitrogen storage tank is provided with a nitrogen back-blowing pipe connected with the adsorption towers; a recovery pipe connected with the waste gas storage tank is arranged on the adsorption tower inlet switching pipeline, and a waste gas blowback pipe connected with the drying tower and an oxygen-enriched waste gas pipe connected with a boiler air inlet pipe are arranged at an outlet of the waste gas storage tank. The system is simple in structure and easy to implement, the cost is low when an existing nitrogen making device is transformed, and the energy consumption of the system can be effectively reduced.

The invention relates to the technical field of oxygen supply, and provides a self-adjusting dispersion type oxygen-enriched sleep pillow which comprises an oxygen conveying assembly, a monitor, an analyzer and an oxygen supply controller, oxygen is conveyed to an oxygen conveying pipe of the sleep pillow through the oxygen conveying assembly, the heart rate and the blood pressure of a target object are monitored through the monitor, historical data monitored by the monitor are analyzed through the analyzer, and the oxygen supply controller is connected with the sleep pillow. The method comprises the following steps: identifying an anoxia influence period through the heart rate and blood pressure of a target object, distinguishing a significant influence period and a weak interference period based on an anoxia influence tendency characterization value, monitoring the oxygen state of a sleep pillow target object area, determining oxygen catheter characterization parameters, and predicting whether the oxygen concentration of the target object area is abnormal or not based on the oxygen catheter characterization parameters. According to the method, the influence of environmental area difference on the target object in the running process of the oxygen-enriched sleep pillow is considered, the oxygen compensation device is adaptively started, and then the oxygen supply efficiency and the oxygen condition of the target object area are guaranteed.

The invention relates to an oxygen-vacancy-rich perovskite catalyst for advanced treatment of organic pollutant wastewater through catalytic ozonation. The molecular structure of the oxygen-vacancy-rich perovskite catalyst is AxBO3-delta, wherein the A site is Ca, the B site is a metal active component, the metal active component is Mn, and delta is an oxygen vacancy and is 0-1; x is the stoichiometric value of A site, and the values of x are 1, 1.05, 1.1, 1.15 and 1.2. The catalyst has higher oxygen vacancy and higher catalytic activity; according to the catalyst, generation of superoxide free radicals (. O2 <->) is induced through oxygen vacancies, a new mechanism of Mn (II / III / IV) rapid circulation is constructed through the oxidation-reduction characteristic of. O2 <->, and the total yield of the free radicals is increased by 200%. The catalyst is simple in preparation process, rapid preparation of the catalyst can be achieved in the oil bath-roasting process, the catalyst is oriented to advanced treatment of organic pollutant wastewater, the catalyst has good catalytic performance, the cost is effectively saved, and the catalyst has wide prospects.

The invention provides a membrane separation oxygen production device capable of simultaneously producing medical oxygen and oxygen-enriched air, the device comprises a common oxygen production main machine, a membrane separation purification system and a pure oxygen production main machine, when the common oxygen production main machine needs to be purged, oxygen-enriched nitrogen, high-concentration oxygen-enriched air and waste gas can be utilized to purge an adsorption tower. The system has the advantages that the oxygen concentration can be automatically switched according to the requirements of a hospital, and medical oxygen and oxygen-enriched air are provided for the hospital at the same time or are independently provided for any one of the medical oxygen and the oxygen-enriched air; the membrane separation oxygen production technology is adopted, high-concentration waste gas generated during membrane separation medical oxygen production is used in the production process of oxygen-enriched air, the air-oxygen ratio is optimized, and the gas consumption is lower compared with a medical oxygen production system on the market; the waste gas exhausted from the direct current side in the medical oxygen generation process is rich in oxygen which is still contained in gas mainly containing argon and nitrogen and still contains high-concentration oxygen, the oxygen is used for producing oxygen-enriched air, the production efficiency is improved, the air amount needed by a product is reduced, and the effect of reducing energy consumption is achieved.

This disclosure relates to the adsorption and separation of fluid components, such as oxygen, in a feed stream, such as air, using zeolite ITQ-55 as the adsorbent. A process is disclosed for adsorbing oxygen from a feed stream containing oxygen, nitrogen and argon. The process comprises passing the feed stream through a bed of an adsorbent comprising zeolite ITQ-55 to adsorb oxygen from the feed stream, carrying out an equalization step to improve recovery, thereby producing a nitrogen product stream depleted in oxygen as well as a waste stream can be collected to have enriched oxygen. The feed stream is exposed to the zeolite ITQ-55 at effective conditions for performing a rapid cycle of kinetic separation, in which oxygen exhibits greater kinetic selectivity than nitrogen and argon.

The present invention provides a preparation method and application of a transparent conductive layer in a perovskite solar cell. The preparation method comprises the following steps: using a radio frequency sputtering method to deposit a layer of oxygen-rich transparent conductive seed layer on the surface of a battery substrate, and then using a direct current sputtering method to deposit a layer of transparent conductive thickening layer on the oxygen-rich transparent conductive seed layer to obtain a transparent conductive layer. The present invention makes the crystal orientation of the entire transparent conductive layer more regular. This regular crystal orientation is beneficial to improving the quality of the crystal, reducing grain boundaries and defects, and making the transmission of electrons in the crystal smoother; in addition, the oxygen-rich transparent conductive seed layer can enhance the adhesion between the transparent conductive layer and the battery substrate, so that the crystals of the transparent conductive layer are better combined with the surface of the battery substrate; in addition, the oxygen-rich transparent conductive seed layer can not only better resist the erosion of external chemicals, but also prevent ion migration, which is very important for improving the reliability and service life of the device.

The present invention relates to a method for removing organic pollutants in water by activating sulfite with Fe-N-C, belonging to the technical fields of new catalyst materials and environmental purification technologies. An iron salt and a carbon-nitrogen precursor are added to an organic solvent, and the iron salt and the carbon-nitrogen precursor form a complex. Then, the organic solvent is removed to obtain a dry powder. The dry powder is calcined under a protective atmosphere, and after carbonization, an Fe-N-C catalyst is obtained. The present invention solves the bottleneck problem of low efficiency in traditional heterogeneous sulfite activation technology due to few reactive sites and slow oxygen mass transfer by constructing carbon-based metal active sites with oxygen-rich properties. This catalytic oxidation method has high treatment efficiency and simple operation, has a wide pH application range, strong anti-ion interference ability, and high reusability, and has broad application prospects in the field of actual industrial wastewater treatment.

The invention relates to the technical field of membrane separation, in particular to an MOFs mixed matrix membrane for nitrogen-oxygen separation and a preparation method of the MOFs mixed matrix membrane. The preparation method comprises the following steps: by taking high polymers such as PI, PSF and PIM-1 as film forming materials, embedding a metal organic framework (MOF) material with an affinity effect on oxygen into a polymer film matrix by adopting an in-situ growth method. The nitrogen-oxygen separation mixed matrix membrane is prepared through an in-situ growth MOF method, the method does not need to prepare MOFs firstly and then disperse MOFs particles, the agglomeration phenomenon caused by non-uniform dispersion is avoided, the gas separation performance of the composite membrane can be regulated and controlled by increasing the growth period of MOFs, the permeability of oxygen and the selectivity of oxygen / nitrogen are improved, and the nitrogen-oxygen separation effect is improved. Clean oxygen-enriched air with the oxygen content being 50% or above can be stably produced, and cost and energy consumption are reduced.

The invention relates to an oxygen vacancy-rich modified zero-valent iron / biochar composite material and application thereof. The modified zero-valent iron / biochar composite material comprises a biochar carrier and zero-valent iron loaded on the biochar carrier, the surface of the zero-valent iron is coated with sulfur-containing ferrides and / or boron-containing ferrides, and the surface of the zero-valent iron contains rich oxygen vacancies; the modified zero-valent iron / biochar composite material is specifically prepared by the following steps: dispersing a biochar carrier and zero-valent iron in oxygen-free water, and grinding; adding a sulfur source or a boron source into the ground suspension, fully stirring and grinding, and drying; and soaking in a reducing solution, calcining at high temperature, and cooling to obtain the modified zero-valent iron / biochar composite material. Compared with the prior art, the modified zero-valent iron / biochar composite material prepared by the invention can be synergistically used with a compound oxidant to realize effective remediation of organic contaminated soil.

The invention discloses a diabetic foot therapeutic apparatus, which relates to the field of medical instruments, solves the problem of poor therapeutic effect of the diabetic foot therapeutic apparatus, and comprises: a data acquisition module, which is used for respectively acquiring the average number ratio of sample bacteria, the pressure coefficient of an affected area, the oxygen enrichment coefficient of the affected area and the area ratio of a foot affected area to obtain affected foot monitoring data, the data analysis module is used for analyzing the sick foot monitoring data to obtain a first treatment control coefficient, a second treatment control coefficient and a third treatment control coefficient, and sick foot treatment analysis data is obtained; the treatment control module is used for controlling the ultraviolet treatment function, the negative pressure treatment function and the oxygen-enriched treatment function of the diabetic foot treatment instrument according to the diseased foot treatment analysis data, the treatment functions are automatically controlled by obtaining the treatment control coefficient, it is ensured that the treatment process is more accurate, the treatment effect is improved, and wound healing is promoted.

The invention discloses an oxygen-enriched destressing crystal growth method and a crystal growth furnace, and relates to the technical field of crystal growth, and the oxygen-enriched destressing crystal growth method comprises the following steps: step 1, pre-treating a PMNT polycrystal material, and putting the pretreated PMNT polycrystal material into a crucible; 2, pre-flushing the growth furnace and creating an oxygen partial pressure environment; 3, raising the temperature in the growth furnace to melt and homogenize the PMNT polycrystal material in the crucible; step 4, the crucible moves downwards for directional solidification of the crystal, a solid-liquid interface is formed and stably moves upwards, and in the process, a dynamic regulation and control strategy is adopted in the growth furnace to control an oxygen-enriched environment to promote crystal growth, so that the crystal digests growth stress in the growth process, and formation of oxygen vacancies is inhibited; and step 5, after crystal growth is finished, gradient cooling is performed to room temperature in an oxygen-enriched environment, and a crystal ingot is obtained. Oxygen is used as a regulation and control tool, the stress problem caused by oxygen vacancy is physically solved, the color center and performance problems caused by oxygen vacancy are chemically solved, and the crystal growth quality is improved.

The invention relates to a geopolymer grouting material and a preparation method thereof, and relates to the technical field of grouting materials, the geopolymer grouting material comprises the following raw materials by weight: 20-30 parts of red mud, 7-15 parts of fly ash and 50-65 parts of an alkali activator; the alkali activator is composed of a silica fume-based solution and a modified water glass solution in a weight ratio of (15-19): (7-11). On one hand, the red mud is activated and modified by adopting an oxygen-enriched microwave plasma process, and meanwhile, the alkali activator composed of the silica fume-based solution and the modified water glass solution in a specific proportion is matched, so that the properties such as the condensation rate and the mechanical strength of the red mud-fly ash geopolymer are remarkably improved; the use requirement of rapid hardening of the grouting material is met, and the defects of the existing red mud-fly ash geopolymer grouting material are overcome.

The present application relates to the field of environmental protection additives, specifically disclosing a natural gas low-temperature combustion-supporting environmental protection additive and its preparation method. The natural gas low-temperature combustion-supporting environmental protection additive comprises the following substances in parts by weight: 10 to 50 parts of dimethyl carbonate, 0 to 10 parts of methyl tert-butyl ether, 10 to 20 parts of methanol, and 15 to 20 parts of dispersed catalytic particles; the dispersed catalytic particles are carbon aerogels adsorbed with nano-Pt particles. The natural gas low-temperature combustion-supporting environmental protection additive of the present application uses dimethyl carbonate, methyl tert-butyl ether, and methanol as liquid matrices, and a carbon aerogel material adsorbed with the precious metal Pt as a catalytic material. The environmental protection additive material is effectively coated and loaded in the boiling gas phase. A uniform bonding form is formed between the gas-phase environmental protection additive and the natural gas, so that the methane in the natural gas opens the gas-hydrogen-oxygen bond under the action of the environmental protection additive at 80 to 100°C, effectively catalyzing the combustion of natural gas in an oxygen-rich state, further improving the activity of natural gas in a low-temperature environment.

The invention discloses an oxidation-resistant monomer casting nylon material and a preparation method thereof, and relates to the field of material preparation, and the monomer casting nylon material is applied to a high-temperature and oxygen-enriched environment and comprises the following components in parts by mass: 100 parts of caprolactam; 0.1-0.3 part of a catalyst which is one of sodium hydroxide, potassium hydroxide or lithium hydroxide; 0.5 to 1.5 parts of an activating agent, wherein the activating agent is N-acetyl caprolactam; 0.7 to 3 parts of a main antioxidant, wherein the main antioxidant comprises a hindered phenol antioxidant and a thioester antioxidant; 0.1-0.5 part of an auxiliary antioxidant, which is a metal deactivator; 1-3 parts of an inorganic filler which is modified montmorillonite; and 0.5-2 parts of a hydrophobic agent which is a silane coupling agent. By constructing a composite anti-oxidation system, multi-level synergistic protection can be formed for three key oxidation stages of free radical initiation, peroxide accumulation and metal catalysis, and a full path of an oxidation chain reaction is covered from a molecular level, so that the aging process of the material is remarkably delayed, and the service life of the material is prolonged. And high oxygen resistance and relatively long service life are provided for nylon application under severe working conditions.

The present invention discloses an oxygen-rich vacancy iron-based catalyst derived from a discarded heating pad, which uses the contents of the discarded heating pad as raw materials, obtains an iron-based catalyst uniformly mixed with activated carbon, vermiculite and Fe3O4 after anaerobic calcination, and then introduces abundant oxygen vacancies into the Fe3O4 structure through potassium borohydride reduction treatment to obtain an oxygen-rich vacancy iron-based catalyst. The present invention also discloses the use of the oxygen-rich vacancy iron-based catalyst in the degradation of organic pollutants in water bodies by Fenton-like oxidation technology. The method for preparing the oxygen-rich vacancy iron-based catalyst of the present invention is simple and mild, and the obtained catalyst has high yield, good effect, easy magnetic separation and recovery, reusability, regeneration, and a wide range of applications. The present invention uses discarded heating pads commonly seen in daily life as raw materials, which not only solves the resource utilization of waste, but also obtains a catalyst with application value, realizes the application in the remediation of organic pollutant wastewater, and meets the environmental goal of "treating waste with waste".

The utility model provides refrigeration equipment. The oxygen adjusting device comprises an oxygen adjusting storage container and an electrolysis oxygen adjusting module, the oxygen adjusting module is arranged in the oxygen adjusting container so that the oxygen-rich atmosphere or the oxygen-poor atmosphere can be supplied to the oxygen adjusting container, the oxygen adjusting container comprises a first oxygen adjusting container body and a second oxygen adjusting container body, the first oxygen adjusting container body is arranged in the second oxygen adjusting container body, and the electrolysis oxygen adjusting module is arranged in the second oxygen adjusting container body. Or the second oxygen adjusting container is arranged in the first oxygen adjusting container. By means of the arrangement, the concentration of oxygen in the oxygen adjusting container can be adjusted, and meanwhile the equipment structure is more compact.

The present invention proposes an Al / La 2 O 3 The invention discloses a catalyst and a preparation method and application thereof, belonging to the field of organic synthesis catalytic materials, and is used to solve the technical problem of low yield of enone compounds. 2 O 3 The catalyst preparation comprises the following steps: dissolving lanthanum salt in water to prepare lanthanum salt solution, adding precipitant to prepare lanthanum hydroxide gel; adding aluminum hydroxide to lanthanum hydroxide gel and mixing to prepare mixed gel, washing and drying the mixed gel to obtain precursor; calcining the precursor to obtain Al / La 2 O 3 Catalyst. Al / La 2 O 3 The preparation method of the catalyst is simple and suitable for large-scale preparation. The material surface is rich in oxygen vacancies and divalent lanthanum ions, and has the characteristics of stable structure, high catalytic efficiency and stable cycle activity. 2 O 3 The catalyst can specifically catalyze the condensation of cyclopropyl methyl ketone molecules, effectively activate the chemical bonds in the reactants to enhance the catalytic efficiency, and achieve a higher yield at a lower reaction temperature.

The invention belongs to the technical field of titanium alloy additive manufacturing, and particularly relates to an electron beam additive manufacturing method for oxygen-enriched titanium alloy. According to the method, circulating titanium alloy coarse powder with the oxygen content being 0.25 wt.%-0.30 wt.% is adopted, the circulating titanium alloy coarse powder is dried and then subjected to printing forming, and a powder layer is obtained; according to the method, electron beam powder bed cladding is conducted on a powder layer under the environment that the vacuum degree is 10 <-3 > Pa to 10 <-5 > Pa, a BCC phase is reserved by means of a steady-state thermal field formed by electron beam powder bed cladding at a preheated substrate at the temperature of 700 DEG C to 800 DEG C, in the deformation process, transformation from BCC to HCP and transformation from HCP to FCC are induced by stress, and the high-toughness oxygen-enriched titanium alloy is obtained; the excellent performance matching of the tensile strength of 1220 MPa and the elongation percentage of 14.5% is realized, and meanwhile, the uniform elongation percentage of 8.1% is kept.

The invention discloses a multi-channel oropharyngeal ventilation device for anesthesia, and relates to the technical field of medical instruments. The device comprises a breathing machine, a gas transmission chamber is arranged on one side of the breathing machine, a gas transmission end is arranged in the gas transmission chamber, a butt joint pipe is fixedly inserted into one side of the gas transmission end, a limiting ring is fixedly connected to the butt joint pipe in a sleeving mode, and a horizontally-arranged control knob is rotationally installed in the gas transmission chamber; and the control knob is fixedly sleeved with a fan-shaped limiting plate. The multi-channel air conveying assembly is arranged, during first air conveying, part of oxygen-enriched air can be conveyed into the fan-shaped supporting air bags through the first vent holes, and the two third vent holes are gradually filled with the oxygen-enriched air through the second vent holes and the third vent holes, so that the fan-shaped supporting air bags and the annular air bags are gradually expanded, and the oropharynx of a patient is slightly expanded; medical staff can conveniently adjust the insertion position of the oxygen catheter, and the situation that soft tissue of the oropharynx of a patient presses the oxygen catheter, and consequently air conveying is difficult or the air conveying amount is insufficient is prevented.

The invention relates to high-purity oxygen preparation equipment and an air separation system applying the high-purity oxygen preparation equipment. The high-purity oxygen preparation equipment comprises a high-purity oxygen tower and a high-purity oxygen tower evaporator, a high-purity nitrogen outlet in the top of the lower rectification tower is connected with a first gas inlet in the condensation side of the high-purity oxygen tower evaporator, and a first liquid outlet in the condensation side of the high-purity oxygen tower evaporator is connected with a reflux inlet in the top of the upper rectification tower; an oxygen-enriched gas outlet in the lower part of the lower rectifying tower is connected with a second gas inlet of a high-purity oxygen tower evaporator, and a second liquid outlet of the high-purity oxygen tower evaporator is connected with a reflux liquid inlet in the top of the high-purity oxygen tower or is connected with a reflux liquid inlet in the lower part of the upper rectifying tower; and an oxygen-enriched liquid outlet at the lower part of the upper rectifying tower is connected with a reflux liquid inlet at the top of the high-purity oxygen tower. The air separation system comprises double-tower nitrogen preparation equipment and the high-purity oxygen preparation equipment. High-purity oxygen or high-purity liquid oxygen products can be prepared on the basis of preparing high-purity nitrogen, the air separation efficiency is improved, and gas waste is reduced.

The utility model discloses a fresh-keeping device for a refrigerator and the refrigerator, and relates to the field of refrigerators. The refrigerator is provided with at least two mutually independent fresh-keeping chambers, the fresh-keeping device comprises an oxygen-enriched assembly, the oxygen-enriched assembly comprises an oxygen-enriched membrane, a collection cavity and an oxygen reduction bin, the collection cavity and the oxygen reduction bin are arranged on the two opposite sides of the oxygen-enriched membrane, the oxygen-enriched assembly is used for enabling more oxygen in the oxygen reduction bin to penetrate through the oxygen-enriched membrane and enter the collection cavity relative to nitrogen, and the oxygen reduction bin is provided with at least two ventilation openings; the at least two air vents are used for communicating the at least two fresh-keeping chambers; the air inlet end of the air extractor is communicated with the collecting cavity of the oxygen enrichment assembly; and the switch piece is used for controlling opening and closing of the at least one ventilation opening and adjusting the proportion of the circulation areas of the at least two ventilation openings. According to the fresh-keeping device, the single air extractor and the single oxygen enrichment assembly are used for efficiently reducing oxygen in the at least two fresh-keeping chambers, and the cost is low. And the oxygen reduction capacity of the fresh-keeping chamber can be adjusted, and the requirements for oxygen concentration of different types of food materials can be met.

The utility model discloses a low-noise intelligent oxygen cabin. The low-noise intelligent oxygen cabin comprises a cabin body, a cabin door, an inner isolation plate, an integrated control part, a monitoring sensor group and an operation part, the cabin body comprises a hollow shell made of sound insulation materials. The cabin door is made of sound insulation glass and can be installed at an access port of the cabin body in an openable mode. A sound attenuation and noise reduction isolation layer made of a sound absorption material is arranged in the inner isolation plate, and the inner isolation plate is detachably connected to the connecting step of the cabin body in a sealed mode; the monitoring sensor group monitors pressure, temperature and oxygen-enriched concentration data in real time and feeds back the pressure, temperature and oxygen-enriched concentration data to the integrated control part, and the integrated control part controls the oxygen generation module, the pressurization module and the temperature control module to work or start and stop, so that the silent oxygen chamber is at the set temperature, pressure and oxygen-enriched concentration. The utility model has the advantages of low noise, silence environment, immersion treatment of personnel in the cabin, constant-temperature, constant-pressure and constant-oxygen medical environment of the silence oxygen chamber, and good medical effect.

The present invention provides an oxygen-dominated supra-nano dual-phase catalytic reaction material, which includes a uniform oxygen-enriched amorphous shell and a core encapsulated within the uniform oxygen-enriched amorphous shell. This invention exhibits ultrahigh HER performance, a critical reaction in water splitting, making it suitable for application in hydrogen production industries, battery companies, new energy vehicle enterprises, and large power stations.

The application discloses a preparation method and application of nitrogen-doped oxygen-rich hierarchical porous carbon, and adopts a one-step co-activation method to prepare the nitrogen-doped oxygen-rich hierarchical porous carbon, which is simple in process and low in energy consumption. The structure and surface chemical performance of the prepared nitrogen-doped oxygen-rich hierarchical porous carbon catalyst are easy to control. The prepared TNS-X material has a large specific surface area and a developed pore structure, which is beneficial to exposure of catalytic sites and diffusion of reactants. Through ammonia and water vapor co-activation, efficient doping of nitrogen atoms and oxygen atoms is realized, the number of catalytic sites is increased, and the catalytic activity is improved. The TNS-800 material exhibits high catalytic performance in a peroxymonosulfate (PMS) activation process, and can completely remove organic pollutants such as acetylaminophenol in a short time.

The invention relates to application of a molybdenum-based electrocatalyst cathode in electrocatalytic degradation of antibiotics in wastewater. According to the cathode, foamed nickel serves as a substrate, and carbon-doped oxygen vacancy-enriched molybdenum oxide C-MoO2-X is loaded on the surface of the substrate. The preparation method of the electrocatalyst is simple to operate, low in cost and environment-friendly, and the NF net structure with excellent performance can effectively avoid MoO2 agglomeration in the calcination process. According to the preparation method, pressure stress is generated by utilizing lattice shrinkage after carbon doping, adjacent O atoms are forced to be separated from lattices, stable oxygen vacancies are formed in MoO2 lattices through electron reconstruction, electron transfer is enhanced, strong Mo-C bonds are formed, Mo atoms are stabilized, oxidation dissolution of the Mo atoms is inhibited, the oxygen adsorption behavior is optimized, and an activation energy barrier from O2 to H2O2 to O2 is reduced. According to the invention, by designing a carbon-doped pyrolysis process, the selective generation of O2 of more than 90% is realized. The research provides a new design scheme for preparing an efficient and cheap non-noble metal ORR catalyst.

The invention discloses a bismuth oxyiodide modified oxygen-vacancy-enriched titanium dioxide nanotube array and a preparation method and application thereof, which realize wide-range and efficient light response efficiency: BiOI (forbidden bandwidth is approximately equal to 1.8 eV) is used as an excellent visible-light-driven photocatalyst and forms a semiconductor heterojunction with TNAs after being loaded, the spectral response range of the material is widened to a visible light wave band, and the visible-light-driven visible-light-driven photocatalyst can be used for preparing a visible-light-driven photocatalyst. And the construction of interface oxygen vacancies also improves the transmission efficiency of photon-generated carriers, so that the photocatalytic efficiency and the visible light utilization rate of the material are greatly improved. The material prepared by the invention can be used for a long time after being fixed in a reactor, and after the material is recycled for 20 times, the degradation rate of typical refractory organic matters in single 60 minutes can still be kept above 90%.