129 results about "Adsorption selectivity" patented technology

The invention relates to an acylhydrazone bond-connected covalent organic framework material, in particular to an acylhydrazone bond-connected covalent organic framework material as well as a preparation method and application thereof, and aims to overcome the defects of various materials for adsorbing Pd (II) in one aspect or the defects of poor stability and durability in high-acidity and high-radioactivity environments. Or the adsorption selectivity on Pd (II) is not strong. As an emerging crystalline organic porous polymer, the covalent organic framework is mainly formed by connecting pure organic structural units through dynamic covalent bonds, has the advantages of permanent high porosity, low density, high chemical stability, high thermal stability and the like, and is expected to realize Pd (II) adsorption in strong acid and ray irradiation environments.

The invention discloses a nano flower-shaped covalent organic framework material as well as a preparation method, a device and application thereof, and belongs to the field of water treatment. An amino compound and an aldehyde group compound form a covalent organic framework structure with a specific flower-shaped structure under the action of a catalyst and a regulating agent, the covalent organic framework structure continues to react with a carboxyl compound, then metal is loaded, and the nano flower-shaped covalent organic framework material is obtained. Carboxyl in the carboxyl compound responds to uranium in water and does not respond to other metal ions, other interference ions are eliminated, in addition, the carboxyl compound further has sulfydryl which can fix subsequently-loaded metal ions, the loading capacity of the metal ions is improved, and the metal ions can be loaded on the surface of the metal ions in the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface. When the nano flower-shaped covalent organic framework material prepared by the method is used for treating water, uranium ions can quickly reach adsorption sites, and the material as an adsorbent is higher in stability and higher in adsorption selectivity.

The invention discloses a simulated screening and process optimization method of an anhydrous hydrogen fluoride desulfurization adsorbent, and relates to the technical field of anhydrous hydrogen fluoride, and the method comprises the following steps: constructing a database, and establishing a basic screening library; constructing an intelligent screening engine, and performing force field parameter correction on the materials in the basic screening library to capture a high-polarity solvent effect; calculating and extracting adsorption selectivity, Henry coefficients and working capacity indexes, and screening out a primary candidate material set; a core candidate material is optimized; determining an optimal adsorbent model; the microscopic adsorption data of the optimal adsorbent model are converted into macroscopic process parameters, the macroscopic process parameters are imported into a macroscopic process simulator for prediction, and process optimization is completed. According to the method, the strong polar solvent effect is simulated by constructing the corrected force field environment, and high-throughput screening of the adsorption materials is achieved in combination with an active learning strategy; an electronic grade refinement and modification strategy is utilized to optimize adsorption sites, and microcosmic adsorption data and a macroscopic mass transfer model are coupled to realize accurate prediction and optimization of an adsorption process.

The present application relates to a kind of phosphine oxy group covalent modification composite adsorption material and its preparation method and purposes, the preparation method includes the following steps: (1) mixing dopamine hydrochloride, phosphine-containing substrate, tris-hydroxymethyl aminomethane hydrochloride and sodium hydroxide in solvent, to obtain mixed solution;(2) the mixed solution obtained in step (1) and solid phase material are mixed, then oscillation reaction is carried out, to obtain solid-liquid mixture;(3) the solid-liquid mixture obtained in step (2) is carried out solid-liquid separation, and the solid phase part obtained is sequentially washed and dried, to obtain phosphine oxy group covalent modification composite adsorption material.The phosphine oxy group covalent modification composite adsorption material provided by the present application has excellent adsorption selectivity and material stability, and can be used for the high-selectivity separation and recovery of rare metals indium and gallium.

The invention discloses a carboxyl-functionalized porous organic polymer, a preparation method thereof and application of the carboxyl-functionalized porous organic polymer in ammonia gas adsorption separation and sensing. The polymer is obtained by free radical polymerization, hydrolysis and acidification of monomers containing vinyl and ester groups, and has a mesoporous structure and a skeleton carboxyl functional group. The preparation method is simple and mild in condition. The polymer has excellent adsorption selectivity and high adsorption capacity on ammonia gas, the static adsorption capacity on the ammonia gas under the conditions of 298 K and 1 bar is not lower than 6.5 mmol / g, the ammonia gas can be efficiently separated from NH / N / H and NH / COs mixed gas, and the cycling stability is good. An ammonia gas sensor prepared by taking the graphene oxide as a sensitive material has linear or piecewise linear response to ammonia gas with the concentration of 1-100 ppm at room temperature, the detection limit is lower than 30 ppb, and the selectivity is excellent. The invention overcomes the defects of the existing ammonia gas adsorption separation material and sensor, has important significance for optimizing the ammonia production process and reducing pollution, and has wide application prospects.

The invention relates to an adsorbent based on an X molecular sieve and preparation and application thereof, and a preparation method of the adsorbent comprises the following steps: (1) mixing the X molecular sieve with a binder, molding and roasting to obtain a molded body; (2) treating the molded body obtained in the step (1) with an alkali solution to perform in-situ crystallization on the binder in the molded body to obtain a crystallized product; (3) carrying out partial barium ion exchange on the crystallized product obtained in the step (2) by using a barium salt solution, and drying to obtain a dried product; (4) carrying out ammonium ion exchange on the dried product obtained in the step (3) by using an ammonium salt solution, and roasting in a flowing atmosphere to obtain a roasted product; and (5) performing barium ion exchange and optional potassium ion exchange on the roasted product obtained in the step (4), and then drying to obtain the adsorbent. The adsorbent has at least two kinds of mesoporous channels with different apertures, has high barium ion exchange capacity, high adsorption capacity and compressive strength, and shows good adsorption selectivity and mass transfer performance when used for adsorption separation of p-xylene.

The invention discloses a coal bed gas exploitation and separation utilization method based on SCCO2 assistance, and belongs to the technical field of coal bed gas development. Supercritical carbon dioxide is prepared through a high-pressure reaction kettle and stored in a supercritical carbon dioxide storage and collection tank, meanwhile, nitrogen mixed with graphene is introduced, and CO2 / CH4 adsorption selectivity is enhanced by means of the characteristic that the specific surface area of graphene is large. A variable-frequency sound wave diffuser is matched to excite coal seam micro cracks through low-frequency sound waves, and supercritical carbon dioxide and nitrogen mixed gas is injected into a coal seam injection well. In the injection process, the sound wave diffuser synchronously radiates high-frequency sound waves to improve the displacement efficiency, then the gas enters the gas separation tower integrated with the molecular sieve membrane, and the produced gas is divided into upper methane, middle carbon dioxide and other bottom miscellaneous gas. Methane is pressurized by an air compressor and then stored in a methane storage tank, carbon dioxide is purified and pressurized and then recycled for coalbed methane exploitation, and offensive gas is cooled and stored after generating power by a steam turbine. And efficient mining, separation and multi-path utilization of the coal bed gas are realized.

The invention relates to a calcium-based desulfurizer and a preparation method and application thereof, and relates to the technical field of desulfurizers, the calcium-based desulfurizer comprises a calcium-based carrier with a micropore-mesopore-macropore three-level pore structure, and a gamma-aminopropyltriethoxysilane modifier dispersed in pore channels, the molecular imprinting layer is modified by an inactive region on the inner wall of the mesoporous; the preparation method comprises the steps of calcium-based carrier pretreatment, composite pore forming, pre-roasting, hydroxyl strengthening and the like. The efficient mass transfer system is constructed through a three-stage pore structure, the modifier and the molecular imprinting layer synergistically improve the structural stability and the sulfur dioxide adsorption selectivity, the calcium base utilization rate and the desulfurization efficiency are improved, and the industrial flue gas desulfurization requirement is met.

This invention discloses a passive adsorption-selective catalytic reduction (CCR) device for diesel vehicles, comprising an electronically controlled nozzle, a first mixing chamber, a pre-catalytic oxidation-reduction chamber, a second mixing chamber, and a post-catalytic oxidation-reduction chamber arranged sequentially. The first mixing chamber includes a first urea solution inlet, a V-shaped breaker wall, and a W-shaped bottom mixing chamber. The V-shaped breaker wall is fixed to the rear wall of the first urea solution inlet pipe. The W-shaped bottom mixing chamber includes an inner cavity and an outer cavity. The inner cavity wall has staggered array openings, and the inner and outer cavities are connected through these openings. A guide wall structure is connected to the outermost pipe at the end of the first mixing chamber. The CCR chamber is connected to the end of the guide wall, and a three-zone integrated catalyst is located inside the CCR chamber. This invention solves the problems of severe NOx escape during the cold start phase, system complexity, and low-temperature urea crystallization in existing selective catalytic reduction technologies.

The invention discloses a preparation method of a molecularly imprinted membrane assembly material, the molecularly imprinted membrane assembly material and a nanowire / nanosheet heterojunction, and belongs to the technical field of water pollution control. According to the preparation method, an Eu / CuO / Bi2O2Se nanowire / nanosheet heterojunction is constructed by taking an Eu / CuO nanowire as a precursor, finally, the molecularly imprinted membrane assembly material for specifically recognizing PFASs is prepared by taking PFASs as a template molecule through cross-linking polymerization and template desorption, efficient and selective removal of PFASs is realized through a specific capture effect, and the prepared molecularly imprinted membrane assembly material has a good application prospect. The problems that a traditional material is low in adsorption selectivity and insufficient in degradation efficiency are solved, and the composite material is suitable for degrading perfluoroalkyl pollutants in a complex environment, has the advantages of being high in stability, environmentally friendly, capable of being repeatedly used and the like, and has wide market prospects.

The invention belongs to the technical field of adsorption material preparation, and relates to an anion defect type prussian blue analogue and a preparation method and application thereof in cesium adsorption.The preparation method comprises the steps that imidazole and halogenated alkane are subjected to an alkylation reaction and anion exchange to prepare ionic liquid, and after water is added, an ionic liquid-water mixed solvent is obtained; the method comprises the following steps: respectively dissolving transition metal nitrate and potassium ferrocyanide into an ionic liquid-water mixed solvent, dropwise adding a potassium ferrocyanide solution into a transition metal nitrate solution, and stirring to obtain a mixed solution; and carrying out hydrothermal reaction on the mixed solution, cooling to room temperature, washing the material, and drying to obtain the anion defect type prussian blue analogue. The cesium ion adsorption capacity and the cesium ion cycling stability are improved by precisely regulating and controlling anion defects in the Prussian blue analogue, and the cesium ion adsorption material has good ion interference resistance in a complex water environment and shows excellent adsorption selectivity and a wide application range.

The invention discloses a biochar-loaded red mud adsorbing material and a preparation method and application thereof, and belongs to the technical field of biochar materials, and the biochar adsorbing material loaded with red mud particles is obtained by pyrolyzing peanut shell powder impregnated with red mud. Red mud is loaded on the surface of biochar, the specific surface area and the number of surface functional groups of the adsorption material are increased, the adsorption performance and the adsorption selectivity of the biochar are improved, red mud particles are effectively dispersed through the stable carbon structure of the biochar, the total adsorption sites of the adsorption material are increased, and therefore the strength structure and the adsorption efficiency of the red mud are improved; further, rapid and massive absorption of lead ions is realized, and excellent performance is shown in efficient lead removal in industrial wastewater.

The application mixes NaX type molecular sieve with kaolin mineral as a binder, then rolls into a ball, calcines at high temperature, converts kaolin into metakaolin, then treats with alkali, converts into X type molecular sieve in situ, then ion exchanges to prepare high selective adsorbent. The prepared adsorbent has high trimethylbenzene adsorption selectivity, compression strength and bulk density.

The application discloses an Ag-ZSM-5 molecular sieve adsorbent for separating and adsorbing Fischer-Tropsch synthesis oil alkane and alkene, which comprises Ag, a binder and ZSM-5 molecular sieve, and the mass ratio of Ag, the binder and ZSM-5 molecular sieve is (1-10):(10-20):(70-89). The preparation method comprises the following steps: alkali treatment, agglomeration molding, drying and calcination, silver ion exchange, drying and calcination. In the application, Ag is impregnated and loaded on the ZSM-5 molecular sieve, the pi complexation of Ag to the double bond of alkene and the high silicon-aluminum ratio (Si / Al=44-46) of the ZSM-5 molecular sieve are fully utilized, the adsorption selectivity to alpha-alkene is improved, the isomerization and oligomerization reactivity of alpha-alkene in the adsorption separation process is reduced, the adsorbent for separating and adsorbing Fischer-Tropsch synthesis oil alkane and alkene to produce high-purity alpha-alkene is prepared, and the adsorbent has the characteristics of high adsorption capacity, high alpha-alkene selectivity, fast adsorption and desorption rate, small desorption agent consumption and low separation energy consumption.

The invention relates to the technical field of water treatment, and discloses a method and a device for recycling bromine triions based on irradiation coupling electronic control ion exchange and application, the method comprises the following steps: placing a bromine-containing stock solution in an electronic control ion exchange device which is a single-chamber device, irradiating the bromine-containing stock solution by using gamma rays, bromine ions in the bromine-containing stock solution are oxidized and react to form bromine triions; and then switching on a circuit and applying an oxidation potential to the working electrode to drive the bromine triions to directionally move towards the membrane and adsorb the bromine triions, and selectively recovering the bromine triions. The device comprises a single-chamber reactor, a liquid path system, a gamma-ray irradiation source for the single-chamber reactor, an electrochemical driving system, a two-electrode system with electrodes immersed in a bromine-containing stock solution, and a potential control system.

The invention aims to provide a preparation method of a lignite-based porous carbon material for styrene adsorption, and belongs to the technical field of environmental functional materials, lignite is selected as a carbon source, the remarkable advantages of rich carbon and wide sources of the lignite are fully utilized, and the material preparation cost is greatly reduced. Through a process means of synchronous regulation and control of supercritical chemical nitrogen doping and KOH activation, on one hand, a porous structure with rich layers is constructed, and a sufficient pore space is provided for rapid diffusion and mass adsorption of styrene molecules; on the other hand, the supercritical nitrogen doping method can effectively remove oxygen-containing functional groups such as hydroxyl, carboxyl and the like in the lignite, more styrene adsorption active sites are provided, and meanwhile, the hydrophobic property of the material is improved, so that the adsorption selectivity and the adsorption capacity on styrene are remarkably improved.

The invention belongs to the field of recycling of precious metal resources in environmental engineering, and particularly relates to a preparation method and application of an organic polymer sphere adsorbent. The amidoxime modified self-polymerized microporous polymer (AO-PIM-1) is prepared into the spherical adsorbent through a phase inversion method, and compared with other traditional adsorbents, the polymer sphere adsorbent is high in specific surface area and good in thermal stability and water stability and has a large number of functional groups with high combining capacity for Au ions. In a low-concentration Au solution, a good adsorption effect and excellent adsorption selectivity are still kept, and Au ions in electronic waste leachate can be well adsorbed and recycled.

The invention belongs to the technical field of micro electro mechanical system manufacturing, and particularly relates to a composite leveling agent for MEMS deep hole nickel alloy electroplating forming and application. The composite leveling agent comprises 6-aminobenzothiazole and 2-hydroxybenzothiazole, and the depth-to-width ratio of the deep hole structure is (1-10): 1. The composite leveling agent disclosed by the invention shows excellent adsorption selectivity and stability in a plating solution; when the leveling agent is applied to MEMS deep hole electroplating forming, diffusion mass transfer limitation of the leveling agent in a deep hole is overcome, the filling performance of nickel alloy in an MEMS deep hole structure is remarkably improved, and a nickel alloy coating which is compact and free of cavity defects can be deposited in a high aspect ratio structure.

This invention discloses a method for preparing high-nitrogen-content nitrogen-doped porous carbon with multiple nitrogen-rich units and its applications, belonging to the field of porous carbon materials. This invention uses a triazine containing a triyne group as the crosslinking center and a pyrazine containing a diazid group as the crosslinking arm. The two react via click chemistry to form a triazole structure, constructing a nitrogen-doped porous polymer with multiple nitrogen-rich units. The nitrogen content is controllable, high, and uniformly distributed, and the nitrogen-containing structure exhibits high stability, resulting in a higher residual nitrogen content after activation and carbonization, thereby improving the CO2 adsorption selectivity of the porous carbon. The nitrogen-doped porous polymer, through activation and carbonization, yields high-nitrogen-content nitrogen-doped porous carbon with multiple nitrogen-rich units, exhibiting high yield, adsorption capacity, selectivity, and reusability, and has broad application prospects in adsorption, catalysis, and membrane separation.

The invention belongs to the technical field of water electrolysis, and particularly relates to a protium and deuterium separation coupling method for water electrolysis hydrogen production. The method comprises using a material containing an iron-based catalyst as a hydrogen evolution reaction electrode, the iron-based catalyst comprising an iron element. According to the invention, an iron element-containing substance is used as a hydrogen evolution reaction electrode for coupling protium-deuterium separation byproduct heavy water in water electrolysis / seawater hydrogen production, the performance is excellent, and the separation ratio can reach more than 6. The iron-based catalyst mostly has a heyrovsky mechanism in a hydrogen evolution reaction, has strong adsorption selectivity to protium and deuterium, and is easier to adsorb and combine with protium to generate hydrogen, so that deuterium is enriched in an electrolyte, and heavy water is produced as a byproduct while hydrogen is produced.

The application discloses a kind of industrial wastewater mixed extractant grading purification directional recovery process, comprising the following steps: industrial wastewater is passed into the adsorption device of amine group-phosphonic acid group modified graphene adsorption material, and the adsorption of specific impurities is strengthened by regulating and controlling bifunctional group mole ratio;Into the adsorption saturated device containing amino phosphonic acid type chelating agent complex desorption agent, using non-overlapping subsection desorption mode directional desorption of n-octanol and N235 and sulfonated kerosene;Mixed desorption liquid is separated after complex desorption agent by rectification, and each extractant component is purified by gradient vacuum distillation;Amine salt waste liquid is reused to adsorption device, and amine salt decomposition and adsorption material functional group in situ regeneration are completed under acidic conditions.The above steps solve the problems of poor adsorption selectivity, desorption interference and material activity attenuation in existing process, realize efficient directional recovery of mixed extractant, and significantly improve the cycle stability of adsorption material.

The invention discloses a carboxyl-functionalized metal organic framework material and preparation and application thereof in treatment of thorium-containing wastewater, and the method comprises the following steps: adding MIL-101-Cl and amino acid into an organic solvent, carrying out ultrasonic dispersion, adding triethylamine, and stirring; reacting at 100 DEG C, centrifuging, washing, and carrying out vacuum drying at 50-70 DEG C; the MIL-101-Cl is prepared by carrying out a reaction on MIL-101 powder, paraformaldehyde, tin tetrachloride and trimethylchlorosilane in anhydrous dichloromethane. The problems that in the prior art, the structure is disordered, stability is poor, selectivity is lost, and industrialization is difficult are solved. According to the invention, a carboxyl donor is grafted on the surface of chloromethylated MIL-101, and meanwhile, the increase of the carboxyl content obviously enhances the adsorption capacity of the material; due to the increase of the carboxyl density, the MIL-101-2COOH has more excellent Th (IV) adsorption selectivity and chemical stability.

The invention discloses a zinc-based modified molecular sieve adsorbent for removing tetrafluoroethylene in carbonyl fluoride and application of the zinc-based modified molecular sieve adsorbent in an adsorber, and belongs to the technical field of adsorption materials for electronic-grade gas purification. The preparation method comprises the following steps: (1) soaking a 5A molecular sieve in an ammonium citrate aqueous solution, treating at 60-90 DEG C for 4-8 hours, and drying to obtain a pretreated molecular sieve; (2) putting the pretreated molecular sieve into a zinc source aqueous solution, reacting at 70-90 DEG C for 12-24 hours, and drying after the reaction is finished; (3) roasting the dried product in an air atmosphere for 6-10 hours; and (4) circularly carrying out the steps (1)-(3) for 1-5 times to obtain a finished product. The prepared zinc-based modified molecular sieve has the advantages of high adsorption selectivity, long penetration time, excellent regeneration performance and the like, and is suitable for a refining process of electronic-grade carbonyl fluoride (the purity is greater than or equal to 99.99%) in semiconductor manufacturing.

The invention discloses a preparation method and application of a heavy metal cadmium contaminated soil remediation conditioner, and relates to the technical field of environmental protection, the heavy metal cadmium contaminated soil remediation conditioner comprises the following components by weight: 30-40 parts of zinc modified charcoal, 10-20 parts of montmorillonite, 5-10 parts of nano iron powder, and 30-55 parts of high temperature activated sepiolite. The heavy metal cadmium contaminated soil remediation conditioner has high adsorptive selectivity, strong fixing stability and mild pH adjustment, can improve the soil fertility, is efficient in multi-component synergism, and is suitable for different types of cadmium contaminated soil.

The invention discloses a preparation method of a magnesium-iron-aluminum ternary layered double hydroxide loaded modified activated carbon composite material. The preparation method comprises the following steps: preparing modified activated carbon; adding the modified activated carbon and a sodium carbonate solution into water, and stirring to obtain a solution A; and sequentially adding a ferric nitrate hexahydrate solution, an aluminum nitrate hexahydrate solution and a magnesium nitrate hexahydrate solution into the solution A, stirring, adjusting the pH value, heating, reacting, washing and drying to obtain the magnesium-iron-aluminum ternary layered double hydroxide loaded modified activated carbon composite material. The magnesium-iron-aluminum ternary LDH is loaded on the modified activated carbon, and the prepared composite material has excellent uranium adsorption performance and also has excellent adsorption selectivity and cycling stability.

The application discloses a method for adsorbing and separating high-purity p-ethyltoluene from heavy aromatic hydrocarbons by using an adsorption separation method, selects cation exchange modified NaX molecular sieve with excellent p-ethyltoluene adsorption selectivity as an adsorbent, uses the adsorption separation method, feeds heavy aromatic hydrocarbon raw materials into the adsorbent, adsorbs p-ethyltoluene in the heavy aromatic hydrocarbon raw materials, obtains a raffinate, feeds a desorption agent, desorbs the adsorbed p-ethyltoluene, and obtains an extract. The method can solve the problem that high-purity p-ethyltoluene cannot be obtained from heavy components at a high yield at present, and can reduce the energy consumption of existing extraction, rectification and other processes through the adsorption separation method.

The invention discloses a method for microorganism-assisted purification of rare earth elements, and belongs to the technical field of rare earth extraction. The method comprises the following steps: activating and culturing acidithiobacillus acidophilus and aspergillus niger, and mixing to obtain a leached strain mixed solution; bacillus and Escherichia coli are activated and cultured and then mixed and dried to obtain adsorption strain powder, and the adsorption strain powder is subjected to immobilization treatment to obtain adsorption strain particles; the rare earth raw material and the leaching strain mixed solution are subjected to a leaching reaction under the action of an accelerant, and rare earth leaching liquid is obtained; carrying out adsorption treatment on the rare earth leachate through an adsorption column filled with adsorption strain particles, and desorbing to obtain an enriched rare earth solution; and carrying out precipitation reaction on the enriched rare earth solution and oxalic acid to obtain rare earth oxalate, and calcining to obtain the rare earth oxide. According to the method for purifying the rare earth elements under the assistance of microorganisms, the leaching efficiency, the adsorption selectivity and the cycling stability of the rare earth raw materials can be improved.

The invention discloses a method for synergistically adsorbing and removing various pollutants such as VOCs, Hg and Br in flue gas or waste gas in the technical field of energy environment engineering. According to the method, through a treatment system in which two stages of adsorption columns are connected in series, the first-stage adsorption column is filled with polyester superfine fibers, the second-stage adsorption column is filled with aramid fibers, and the adsorption selectivity difference and the acting force difference of different fibers to pollutants are utilized, and the adsorption column structure design, the desorption system configuration and the specific adsorption column operation conditions are combined; the efficient synergistic removal of VOCs, Hg0, Hg < n + >, Br and the like in the flue gas or the waste gas is realized. The invention solves the problems of difficult synchronous removal of various pollutants, high operation cost and easy generation of secondary pollution in the prior art, has the advantages of high removal efficiency, low energy consumption, strong compatibility, no secondary pollution and the like, and can be widely applied to flue gas or waste gas purification treatment and related pollutant recovery in electronic waste incineration, hazardous waste disposal, fire coal and other scenes.

The utility model is applicable to the technical field of air purifiers, and discloses a circulating type toxic gas purifier which is applicable to purification of one or more gases such as radioactive gases, acid gases, alkaline gases, hydrogen sulfide, mercury vapor and the like. The modified activated carbon or the modified nano carbon fiber is used as an adsorption purification material of the purification module, so that the new purification module has higher adsorption capacity and adsorption selectivity, the purification efficiency of the purification machine can be improved, and the purification module can stably play a purification role when the purification machine is used for a long time in a high-humidity environment. The pulse discharge mechanism is arranged above the first air outlet of the air inlet fan, and the pulse discharge mechanism can be periodically started, so that air entering the machine shell can be ionized before entering the purification module, and when the ionized air enters the purification module, the air can be purified by the pulse discharge mechanism. The germs adsorbed on the modified activated carbon and the modified nano carbon fiber can be killed.

The invention discloses a method for determining N-nitrosamine compounds in animal-derived food, and belongs to the field of food detection. The method comprises the following steps: freezing and grinding animal-derived food, mixing the animal-derived food with an internal standard solution, deionized water and acetonitrile, and freezing and preserving to obtain a pretreated sample; the method comprises the following steps: treating a pretreated sample through a QuEChERS salt bag, centrifuging, carrying out nitrogen blowing concentration, and mixing with deionized water to prepare an enriched solution; purifying the enriched solution by adopting a purification bag or specific functional resin, and centrifugally filtering to obtain a sample solution; and calculating the content of the target compound through a peak area ratio by using a liquid chromatograph-high resolution mass spectrometer provided with an APCI source and taking N-nitrosodimethylamine-D6 as an internal standard. The functional resin is formed by cross-linking specific functional monomers and is large in specific surface area and high in adsorption selectivity; the method has strong anti-interference capability, and can efficiently detect the N-nitrosamine compounds in dried aquatic products and other animal-derived foods.