166 results about "Adsorption reaction" patented technology

The invention relates to the technical field of radionuclide separation, in particular to an Eu (III) / An (III) separation method based on a zirconium phosphonate-based metal organic framework adsorbent, which comprises the following steps: adding the zirconium phosphonate-based metal organic framework adsorbent into an Eu (III) and / or An (III) nuclide-containing aqueous solution with the acid concentration of 0.001-3M to carry out adsorption reaction, and then carrying out solid-liquid separation, wherein the zirconium phosphonate-based metal organic framework adsorbent is a zirconium phosphonate-based metal organic framework material exchanged by metal cations M; the metal cation M is selected from one of alkali metal ions, alkaline earth metal ions or divalent transition metal ions. According to the invention, the interlayer chemical properties of the material are regulated and controlled through ion exchange, so that the adsorbent has ultrahigh selectivity, rapid adsorption kinetics, high adsorption capacity and excellent structural stability on trivalent actinide / simulated nuclides in extremely high-acid, high-salt and intense-radiation environments; the key problems of low separation efficiency and poor stability in a high-acid complex system in the prior art are solved, and the method is suitable for treating high-level liquid waste.

The utility model discloses a helium dehydrogenation and purification device taking air as regenerated gas. The helium dehydrogenation and purification device comprises a catalytic dehydrogenation reactor, a first adsorption reactor and a second adsorption reactor, a refrigerant of the heat exchanger is connected with a feed gas source and a compressed air source, a refrigerant outlet of the heat exchanger is connected with an inlet of the catalytic dehydrogenation reactor, an outlet of the catalytic dehydrogenation reactor is connected with a heating medium inlet of the heat exchanger, and a heating medium outlet of the heat exchanger is connected with an inlet of the steam-water separator; inlets of the first adsorption reactor and the second adsorption reactor are connected with an outlet of the steam-water separator and a regenerated waste gas outlet; outlets of the first adsorption reactor and the second adsorption reactor are connected with a product gas outlet and a compressed air source; a hydrogen analyzer and a flow meter are arranged on a pipeline for connecting a refrigerant inlet of the heat exchanger with the feed gas source, and a flow controller and a flow control valve are arranged on a pipeline for connecting the refrigerant inlet of the heat exchanger with the compressed air source; the flow controller is electrically connected with the hydrogen analyzer and the flow meter and can control the opening degree of the flow control valve. The problem that hydrogen-containing gas cannot be provided as regeneration gas in most helium catalytic dehydrogenation purification scenes is solved.

The invention discloses a self-weight configuration oxygen evolution electrode and a preparation method and application thereof.The preparation method comprises the steps that a nickel substrate serving as a working electrode, a platinum sheet serving as a counter electrode and a saturated calomel electrode serving as a reference electrode are placed in a NiCo2O4 precursor solution, constant-potential electro-deposition is conducted on the nickel substrate, and a precursor electrode with a Ni-Co LDH precursor on the surface is obtained; putting the precursor electrode into a heating device for heating and heat preservation, and then taking out the precursor electrode for cooling to obtain a NiCo2O4 electrode with a spinel structure; and sequentially putting the NiCo2O4 electrode into a ferric nitrate nonahydrate aqueous solution and a sodium hydroxide solution, and loading alpha-Fe2O3 nanoparticles on the surface of the NiCo2O4 electrode by using a continuous ion layer adsorption reaction method to obtain the self-weight configuration oxygen evolution electrode. According to the preparation method of the self-weight configuration oxygen evolution electrode, a composite catalyst layer composed of NiCo2O4 and alpha-Fe2O3 of a spinel structure is constructed on a nickel substrate, and the self-weight configuration oxygen evolution electrode can adapt to power fluctuation.

The invention discloses a method for promoting formation of a sandy soil mineral organic complex by utilizing fungal secretions, and relates to the technical field of soil improvement and ecological restoration, and the method comprises the following steps: firstly, screening fungal strains to prepare a high-activity fungal inoculant; then preparing a mineral activation inducer containing low-molecular organic acid, trace elements and a biological surfactant; then mixing a high-activity fungal inoculant with a mineral activation inducer, and applying the mixture into the target sandy soil layer; finally, regulating and controlling the condition of the sandy soil layer after bacterium application, and maintaining for a preset time to promote in-situ reaction of fungi and sandy soil minerals to form a stable mineral-organic complex; according to the method, organic acid secreted by fungi can be promoted to be subjected to complexation and adsorption reaction with minerals such as silicate and iron-aluminum oxide in the sandy soil in a short time, meanwhile, fungal hyphae and secreted polysaccharide have physical bridging and wrapping effects, a stable mineral-organic complex is formed in situ, and the stability of the sandy soil is fundamentally improved.

The invention discloses a flue gas carbon dioxide continuous capturing system and method based on solid amine, and the system comprises a flue gas inlet pipeline used for introducing original flue gas; the adsorption reactor is used for adsorbing carbon dioxide in the original flue gas; the bottom of the adsorption reactor is provided with a flue gas and adsorbent inlet, and the flue gas and adsorbent inlet is connected with the flue gas inlet pipeline; the dust remover is connected with the adsorption reactor and is used for carrying out gas-solid separation and discharging decarbonized flue gas; the buffering bin is connected with the dust remover and is used for buffering the solid amine adsorbent; the desorption device is connected with the surge bin and is used for desorbing carbon dioxide in the solid amine adsorbent; and a discharge hole of the desorption device is connected with the flue gas inlet pipeline. The solid amine adsorbent realizes closed and continuous circulation in the system and the method, and high-efficiency and low-energy-consumption capture of carbon dioxide in flue gas is completed.

The present application belongs to the technical field of water treatment, and relates to a heat-sensitive color developing agent F-103 production wastewater treatment method. The present application performs multistage treatment on the wastewater. First, an alkaline chemical separation reaction is performed on the wastewater to remove part of the acidic polar organic matter 3-p-tolylsulfonylureido phenol, p-toluenesulfonic acid and the like in the water. Then, an acid chemical separation reaction is performed to further remove the alkaline polar organic matter intermediate MAPOTs and the like in the water. Subsequently, an adsorption reaction is performed using activated carbon to further remove the organic matter and inorganic impurities in the water. Finally, evaporation and concentration are performed to recover the salt sodium chloride. The wastewater treatment of the present application recovers the salt sodium chloride in the wastewater as a resource under the premise of solving the toxicity problem of the organic matter in the wastewater, and realizes the harmless treatment and the reduction of hazardous waste of the wastewater.

The application discloses a preparation method of a modified anti-polymerization adsorbent for styrene adsorption, and comprises the following steps: (1) mixing a molecular sieve carrier with ammonia water, uniformly stirring, and obtaining an ammonia modified molecular sieve carrier through post-treatment I; (2) mixing the ammonia modified molecular sieve carrier, a metal precursor and deionized water, and obtaining the modified anti-polymerization adsorbent through impregnation treatment, post-treatment II and calcination treatment. When the modified adsorbent prepared by the method is used in a VOCs adsorption reaction in rubber chemical industry flue gas, the styrene in the VOCs has the characteristics of large adsorption capacity and strong anti-styrene polymerization capacity.

This invention discloses a method for hydrotreating catalytic cracking slurry. A fixed-bed hydrotreating process is employed, comprising: in the presence of hydrogen, the catalytic cracking slurry sequentially contacts a hydrotreating protectant, a hydrotreating transition catalyst, and a hydrodesulfurization catalyst to undergo a hydrotreating reaction, yielding hydrotreated oil. The hydrotreating protectant comprises an alumina support with a most probable pore size of 40–100 nm, molybdenum oxide, and cobalt oxide. The hydrotreating transition catalyst comprises an alumina support containing additives and MoO3 and CoO. The support has a bimodal pore size distribution, with smaller pores concentrated in the 10–40 nm range and larger pores concentrated in the 150–400 nm range. This method eliminates the diffusion resistance during the adsorption and reaction of large molecules on the catalyst surface during the hydrotreating of catalytic cracking slurry, increases the capacity for more deposits such as coke, extends the operating cycle of the unit, and facilitates hydrodesulfurization and other reactions. It also increases the content of tricyclic and tetracyclic aromatics in the hydrotreated oil, making it a high-quality feedstock for needle coke production.

The present application relates to the field of chemical synthetic materials and catalysis, and particularly relates to a metal-amorphous structure chalcogenide core-shell nanocrystal and a preparation method and application thereof.The preparation method comprises the following steps: (1) synthesizing Au nanorods through a seed growth method; (2) coating silver on the surface of the Au, and epitaxially growing a silver shell layer nanocrystal; and (3) sulfidizing the silver shell layer nanocrystal, and performing hydrothermal cation exchange to obtain a core-shell structure nanocrystal.In the metal-amorphous structure chalcogenide core-shell nanocrystal, the amorphous surface to a certain extent is conducive to adsorbing reaction substrates, and promotes the progress of the photocatalytic carbon dioxide reduction reaction.The metal-amorphous structure chalcogenide core-shell nanocrystal has excellent gas-solid phase photocatalytic carbon dioxide reduction performance, and can achieve good effects without a photosensitizer and a sacrificial agent.

The invention relates to the technical field of gas purification, and discloses a gas adsorbent regeneration method which comprises the following steps: feeding a to-be-regenerated gas adsorbent into a regenerator, and vacuumizing the regenerator; performing three-stage treatment on the to-be-regenerated adsorbent subjected to vacuum-pumping treatment to obtain a regenerated adsorbent; and sending the regenerated adsorbent to a gas adsorber for adsorption reaction. Through cooperation of vacuumizing pretreatment and three-section treatment, efficient regeneration of various adsorbents is achieved, energy consumption is reduced, secondary pollution is avoided, and the cyclic utilization rate of the adsorbents is increased.

The application discloses a method and system for recovering carbon dioxide in flue gas, belonging to the field of recovering carbon dioxide in flue gas. After high-temperature flue gas is filtered, heat is released for the first time, and then after desulfurization and denitrification, heat is released for the second time. Finally, low-temperature flue gas is formed and is subjected to an adsorption reaction with solid amine particles. The solid amine particles, after absorbing carbon dioxide, are subjected to heat absorption and temperature rise for two times, and then are directly heated by high-temperature water vapor. After the solid amine particles, after carbon dioxide is separated, are cooled, the solid amine particles participate in the reaction again. The flue gas is subjected to heat exchange and temperature reduction for two times, so that the temperature of the flue gas is reduced, the flue gas is better adsorbed by the solid amine particles, and the heat released by the flue gas during temperature reduction is used for preheating the solid amine particles, which have adsorbed carbon dioxide, and gradually increasing the temperature of the solid amine particles, so that the use amount of steam is further reduced when the steam is used for heating.

The application discloses a method for determining a silicate cement hydration performance index, comprising the following steps: 1) respectively establishing mathematical relational expressions of mineral phase dissolution, hydration product deposition, ion adsorption reaction rate and ion concentration; 2) establishing chemical field control equations of mineral phase dissolution, product deposition, ion diffusion and ion adsorption reaction coupling in the hydration process, and potential field and temperature field control equations; combining corresponding boundary and initial conditions, solving the three groups of control equations, and outputting the results of ion concentration, potential and temperature changes with time and spatial distribution in the whole hydration process; and 3) establishing a hydration heat calculation formula of the whole hydration process of the silicate cement. The application further discloses an analysis device. The method is more in line with the real situation of the silicate cement hydration, more accurately describes the cement hydration process from the essential mechanism, can completely, accurately and truly reflect the silicate cement hydration process, and has important research and popularization significance.

The present invention discloses a solid adsorption cycle carbon capture device and method, the device performs carbon capture through an alkali metal-based solid absorbent, and the device at least comprises: a fluidized reactor having a hydration reaction zone and an adsorption reaction zone which are relatively isolated; a hydration bed layer is arranged at the bottom of the hydration reaction area, and water vapor introduced from the bottom of the hydration bed layer is subjected to fluidized hydration reaction; an adsorption bed layer is arranged at the bottom of the adsorption reaction area, and a fluidized adsorption reaction is carried out through carbon-containing gas introduced from the bottom of the adsorption bed layer; the hydration bed layer is communicated with the adsorption bed layer through a vertical pipe; and a hydrated adsorbent particle dense-phase region is arranged in the vertical pipe and is used for isolating the hydration reaction region from the adsorption reaction region. According to the scheme of partition reaction, the contradiction that the reaction rates between hydration and carbonation are not matched is fundamentally solved, the performance of the adsorbent can be exerted to the maximum extent, and the treatment efficiency of carbon capture is effectively improved; the hydration reaction and the adsorption reaction can be subjected to process reinforcement through the fluidized reactor, so that the efficiency of the hydration reaction and the adsorption reaction is effectively improved.

The invention relates to the technical field of industrial wastewater denitrification, in particular to an industrial wastewater deep denitrification method based on a graphene adsorption material, which comprises the following steps: introducing industrial wastewater containing total nitrogen into an adsorption reaction unit; ammonia nitrogen and nitrate nitrogen in the wastewater are removed by adjusting the empty bed contact time; when the adsorption material is saturated, the particles are regenerated, and regenerated liquid is collected for nitrogen resource utilization. According to the core-shell type dual-functional graphene adsorption particle, rich amino functional groups on a PEI chain of the core of the core-shell type dual-functional graphene adsorption particle can efficiently and specifically adsorb and remove ammonia nitrogen through the ion exchange effect, the shell of the core-shell type dual-functional graphene adsorption particle is composed of magnesium-aluminum hydrotalcite growing in situ, exchangeable anions between hydrotalcite laminates can be subjected to ion exchange with nitrate nitrogen, and therefore the ammonia nitrogen can be removed through the core-shell type dual-functional graphene adsorption particle. Selective adsorption of nitrate nitrogen is realized; the synchronous deep removal of ammonia nitrogen and nitrate nitrogen in industrial wastewater is realized, the treatment efficiency is greatly improved, and the process flow is simplified.

This invention discloses a resource recovery system for dredged sediment treatment based on ultrasonic extraction and flotation synergy, comprising: a pretreatment unit, a first-stage ultrasonic extraction reaction unit, a second-stage solid-phase adsorption reaction unit, a third-stage flotation separation unit, a dewatering unit, a residual water treatment unit, and a nitrogen and phosphorus recovery unit. It also discloses a resource recovery method for dredged sediment treatment based on ultrasonic extraction and flotation synergy. This invention solves the problems of low pollutant removal rate, high risk of secondary pollution of dredged soil, and limited resource recovery in traditional dredged sediment treatment. Through the synergistic effect of multiple units including "ultrasonic-liquid-solid-phase adsorption-micro-nano bubble flotation," it achieves efficient release of nitrogen and phosphorus, simultaneous removal of microplastics, rapid separation of clean sediment from polluted phases, and recovery of nitrogen and phosphorus for fertilizer production and resource recovery of clean sediment. The entire process is green and low-consumption, suitable for compact layout on water or near shore, and can simultaneously meet the requirements of sediment reduction, harmlessness, and resource recovery.

The invention relates to a conveying device, in particular to a carbon powder conveying device and method for aluminum carbon flue gas treatment. Comprising a carbon powder adsorption reactor, wherein an arch breaking device is arranged below the carbon powder adsorption reactor; wherein the carbon powder adsorption reactor structurally comprises a shell, a material mixing and arch breaking cone is arranged at the center in a cavity of the shell, the material mixing and arch breaking cone is fixed by a supporting piece, a feeding pipe inserted into the cavity of the shell is arranged at the lower part of the shell, and the bottom of the shell is connected with a throat; the arch breaking device is structurally characterized in that a reamer is arranged at the bottom in a cavity of the ash bucket and fixed on a reamer shaft, two ends of the reamer shaft respectively penetrate through the wall of the ash bucket, one end of the reamer shaft is connected with a motor driving device, and the other end of the reamer shaft is connected with a shaft seat. The equipment is convenient to overhaul and maintain. And the carbon powder conveying process is short, the contact between the carbon powder and the external environment, especially low-temperature gas, is small, and the carbon powder hardening probability is fundamentally reduced.

The invention belongs to the technical field of building materials, and particularly relates to a phosphogypsum-based cementing material additive based on an organic-inorganic composite oriented crystallization network, a cementing material and application. The porous adsorption-reaction agent, the superfine calcium sulfate whisker, the composite thickening time control agent, the organic polymer network agent, the interface reinforcing agent, the active filler and other components are used together, and a traditional alkaline excitation route is avoided through directional crystallization and an organic-inorganic composite network; the composite network obviously improves the mechanical property of the material and increases the softening coefficient; in addition, resource utilization of a large amount of industrial solid waste is achieved, energy is saved, carbon is reduced, the green sustainable development strategy is met, and an economical and feasible solution is provided for high-value and large-scale utilization of phosphogypsum.

The invention belongs to the technical field of precious metal resource recovery, and discloses a light-assisted method for recovering gold from a solution containing monovalent gold ions, which comprises the following steps: S1, mixing the solution containing monovalent gold ions with an adsorbent, and fully stirring under the illumination condition of ultraviolet light with the wavelength of 225-380nm and the intensity of 1-100W / m < 2 > until the adsorption reaction is finished; s2, performing ultrasonic treatment and centrifugation on the reactants to obtain dispersion liquid of the elemental gold and the adsorbent; and S3, the dispersion liquid of the adsorbent is repeatedly utilized, and the gold elementary substance solid is recycled. Wherein the adsorbent is a polymer and a derivative of dopamine, polydopamine, melanin and melanin-like. The method has ultrahigh adsorption capacity and selectivity on gold ions, and is simple and convenient in process, good in material reusability and beneficial to large-scale preparation.

The invention discloses a method for detecting the content of free carbon in a tungsten-titanium solid solution, and belongs to the field of analytical chemistry. According to the method, based on the adsorption effect of the free carbon on bromothymol blue, an adsorption reaction is carried out in an acidic buffer system, and selective adsorption of the free carbon is realized; and then carrying out solid-liquid separation, alkalifying the filtrate, measuring the absorbance under the wavelength of 574nm, and calculating the content of free carbon by using a standard curve method according to the absorbance difference. The method has the advantages of simplicity and convenience in operation, low cost, no use of strong corrosive acid, environmental friendliness and the like. Compared with a high-frequency infrared method, the precision is remarkably improved, and the method is suitable for rapid and accurate determination of free carbon in the tungsten-titanium solid solution.

The present application belongs to the technical field of water pollutant removal, and particularly relates to a water microplastic efficient removal and green catalytic degradation method. The water microplastic efficient removal and green catalytic degradation method comprises the following steps: preparing a lignin carbon-based magnetic adsorption material; adding the lignin carbon-based magnetic adsorption material to a polluted water body containing microplastics to perform an adsorption reaction; under an inert atmosphere, performing thermal degradation on the lignin carbon-based magnetic adsorption material adsorbing the microplastics to realize in-situ catalytic degradation and recovery of the microplastics and regeneration of the lignin carbon-based magnetic adsorption material. In the in-situ catalytic thermal degradation process of the microplastics, the biochar plays a role of an in-situ catalyst, can promote the in-situ catalytic thermal degradation of the microplastics, generates high-value hydrocarbon byproducts, realizes green thermal degradation and reuse of the microplastics, and regenerates the carbon-based adsorption material.

The application provides a synthesis method of 9,10-dibromoanthracene, by introducing HBr generated by a solvent water adsorption reaction, using an industrial sodium hypochlorite solution to react the HBr into bromine, ensuring high concentration of bromine, introducing a solvent dichloroethane to uniformly disperse raw materials, keeping the concentration of bromine stable in the reaction, greatly promoting the reaction speed, greatly shortening the reaction time, and converting the sodium hypochlorite into a sodium chloride aqueous solution after the reaction is completed. The purity of the prepared 9,10-dibromoanthracene is more than 99%, and the by-products generated in the reaction are environment-friendly and non-polluting.

This invention discloses a modified biochar, its preparation method, and its uses. The modified biochar of this invention comprises biochar and a calcium-containing compound loaded on the biochar at a loading of 10-30% of the modified biochar mass, wherein the calcium-containing compound is at least one of CaO and Ca(OH)₂. This invention modifies biogas residue with calcium carbonate, resulting in pore filling within the mesopores of the biochar in the 4 nm-10 nm range. The modified biochar promotes the retention of surface O-C=O and C=O oxygen-containing functional groups, and the modified biochar prepared by this invention still maintains good strength. This invention also provides a method and apparatus for treating phosphorus-containing wastewater with modified biochar. Intermittent adsorption reactions of the biochar show that the adsorption performance of the modified biochar of this invention is superior to that of unmodified biochar, with a saturated adsorption capacity between 18 and 20 mg-P / g-BC, making it suitable for use in wastewater treatment plants.

The utility model discloses a wastewater treatment device based on a magnetic adsorbent, and aims to solve the problems that the existing electroplating wastewater treatment difficulty is high and the magnetic adsorbent is difficult to recover. According to the wastewater treatment device based on the magnetic adsorbent, a tank body of an adsorption reaction tank is cylindrical, a water decanter is arranged in the adsorption reaction tank, a first electromagnet device is arranged at the lower part of the cylindrical tank body of the adsorption reaction tank, and a second electromagnet device is arranged at the inverted conical tank bottom of the adsorption reaction tank; a first water outlet of the raw water tank is communicated with the adsorption reaction tank through a first water pipe, one end of a second water pipe is communicated with a second water outlet of the raw water tank, the other end of the second water pipe is communicated with a water inlet of the adsorption reaction tank, and a water injector is arranged on the second water pipe. Based on the magnetic separation characteristic of the magnetic composite adsorbent, the adsorption-magnetic separation reactor is designed, heavy metal wastewater is effectively treated, and meanwhile efficient separation and concentration of the magnetic biological adsorbent can be achieved through the electromagnet.

The invention discloses an algae and microorganism symbiotic phosphorus and nitrogen removal sewage treatment device, which relates to the technical field of sewage treatment and comprises a grit chamber, a hydrolysis fermentation tank, an algae and bacterium symbiotic reaction tank and an adsorption reaction tank, the attachment plate is arranged on the inner side of the phycomycete symbiotic reaction tank, the attachment plate is composed of an ecological net-shaped filter plate and a supporting plate, and a phycomycete symbiotic biological membrane is attached to the ecological net-shaped filter plate. Through cooperation of parts such as the attachment plates, the arch-shaped attachment plates are impacted by sewage, the sewage needs to cross or wind the attachment plates layer by layer in the flowing process to form a buffer path through stepped attachment arrangement, the contact time of the sewage and a phycomycete symbiotic biological membrane on the surfaces of the attachment plates is remarkably prolonged, and the sewage treatment efficiency is improved. A more sufficient reaction opportunity is provided for photosynthesis of algae (such as filamentous green algae) and metabolic reactions (such as nitrification, denitrification and phosphorus absorption) of microorganisms, and the removal efficiency of pollutants such as nitrogen and phosphorus is improved.

This invention discloses a system and method for preparing 4-acetoxybutyraldehyde by hydroformylation of allyl acetate. The system includes a reaction unit, a separation unit, and a product tank connected in sequence, as well as a dynamic dehydration unit that forms a loop with the reaction unit through pipelines and pumps, a catalyst regeneration unit connected to the organic phase outlet of the heating unit, and a circulating dehydration unit connected between the catalyst regeneration unit and the reaction unit. The method employs a carbonyl metal catalytic system, using a bypass molecular sieve to dynamically adsorb the self-condensing water of the reaction. After separating the aldehyde product, the remaining organic phase is deeply dehydrated by the molecular sieve and recycled. This invention reduces the water content in the reaction system by setting up a closed-loop dehydration system throughout the entire process. Through the combined strategy of "dynamic adsorption by molecular sieve + deep dehydration of the circulating phase," it achieves multiple benefits, including "reduced corrosion, reduced highly toxic byproducts, and increased yield."

A system for gas adsorbate capture has an adsorption reactor(s) configured for receiving an adsorbate gas flow. A regeneration reactor(s) is configured for receiving a regenerative fluid flow. A plurality of individual sorbent cells are in a generally continuous cycle between the adsorption reactor and the regeneration reactor. A group of the individual sorbent cells may form an adsorption moving bed in the adsorption reactor to capture the adsorbate from the gas flow.

The invention discloses a real-time fluorescent PCR (Polymerase Chain Reaction) detection method which comprises the following steps: (1) sample treatment: collecting a sample to be detected, and extracting pathogen nucleic acid by using a nucleic acid extraction kit; (2) reverse transcription: the pathogen is RNA virus, and cDNA is synthesized from the extracted RNA through reverse transcription reaction; (3) preparation of a PCR reaction system: preparing a reaction mixed solution containing the following components: a 2 * real-time fluorescence PCR premixed solution, a forward primer and a reverse primer aiming at pathogen specific genes, a fluorescence labeling probe and a cDNA template; (4) carrying out real-time fluorescent PCR amplification; and (5) analyzing a result. By adopting a low-adsorption reaction tube and a hot start enzyme technology, the limit of detection (LoD) is reduced to 10 copies / mL, which is about 5 times higher than that of the existing commercial kit. The specificity of the kit reaches 100%, no false positive exists, the kit is superior to a commercial kit (82%), the sensitivity (98%) of the kit is higher than that of the commercial kit (85%), and the detection rate of low-load samples (Ctgt, 30) is especially higher.

The utility model discloses a high-performance lead-acid storage battery negative plate, and particularly relates to the technical field of lead-acid storage batteries, the high-performance lead-acid storage battery negative plate comprises a negative plate body, a lead-acid adsorption device is arranged in the negative plate body, the lead-acid adsorption device comprises a stabilizing assembly and an adsorption assembly, the adsorption assembly is arranged on the side edge of the stabilizing assembly, and the stabilizing assembly is connected with the adsorption assembly. The stabilizing assemblies are arranged on the outer walls of the two sides of the negative plate body. Compared with the prior art, the high-performance lead-acid storage battery negative plate disclosed by the utility model has the advantages that the lower lead powder interface plate groove realizes adsorption and collection, so that the problems of poor lead powder adsorption reaction caused by repeated reaction of lead powder and insufficient reaction caused by non-uniform reaction can be effectively avoided; and in the device, adsorption reaction control work is synchronously carried out through mesh grids arranged on the outer wall of a grid plate, so that the power generation reaction speed is increased, and meanwhile, the service life of the whole device is further prolonged.

The utility model discloses a generation device of a formaldehyde bottled gas standard substance. The generation device comprises a sublimation device, a catalytic cracking device, a gas storage bottle and a gas carrying system, according to the utility model, the formaldehyde bottled gas standard substance is prepared by a static cracking method, solid powdery trioxymethylene is adopted as a raw material, and a new way of preparing the gas standard substance from solid to gas is realized by regulating parameters such as cracking temperature, reaction time and the like. The device is simple in overall structure composition, small in size, convenient to disassemble and assemble and flexible to use, and the prepared formaldehyde gas standard substance is stored by adopting a gas cylinder, is convenient to carry and transport and can be flexibly applied to field measurement outside a specific laboratory. In addition, passivation coatings are arranged in the formaldehyde gas storage bottle and the formaldehyde conveying pipeline, so that the formaldehyde gas is prevented from being easily adsorbed, reacted and the like in the pipeline in the preparation process and the storage process in the gas bottle, the stable storage of the gas standard substance in the formaldehyde bottle is realized, and the accurate quantity value of the gas standard substance is ensured.

An apparatus includes a filter body, which filters an exhaust gas and feeds it to an adsorption reaction device and is disposed below the adsorption reaction device; and a housing which provides an internal space for storing powder separated from the filter body and is installed below the adsorption reaction device, which housing includes a filter installation unit, which is a space projected below the adsorption reaction device and which provides a filter installation space internally for installing the filter body and an expansion unit that protrudes sideways from the filter installation unit and provides an expansion space which communicates internally with the filter installation space, and the internal space is expanded by the expansion space to increase the powder collection capacity. A suction port for sucking in the exhaust gas is installed in the expansion unit.