82 results about "Catalytic ozone" patented technology

The invention discloses a method for degrading polystyrene (PS) plastic and upgrading and recycling the PS plastic into benzoic acid based on nano MnO2 photocatalytic ozonation, and belongs to the technical field of solid waste recycling. The method comprises the following steps: firstly, mixing PS plastic fragments with nano MnO2 and an organic solvent, then simultaneously introducing ozone into a reaction system at normal temperature and normal pressure, and irradiating with light. Through synergistic catalysis of light and ozone, molecular chains of the PS plastic can be efficiently and selectively broken and oxidized, and finally the PS plastic is directionally converted into benzoic acid with high additional value. After the reaction is finished, a benzoic acid product can be obtained through simple separation, concentration and purification steps. The method provided by the invention realizes high-valued recycling of the waste PS plastic under mild conditions, solves the problems of high energy consumption, complex products, easy generation of secondary pollution and the like in a traditional treatment method, and has the outstanding advantages of green process, efficient reaction, high product value and the like.

The invention provides a preparation method of a metal-based ceramic composite membrane with a catalytic ozone function. The preparation method comprises the following steps: preparing functional powder by taking tetrabutyl titanate as a titanium source and silver nitrate or ferric nitrate as a catalytic active metal source and adopting a sol-gel method; a porous metal pipe is used as a supporting body, metal powder and functional powder which are made of the same material as the supporting body are mixed to prepare functional slurry, the functional slurry is evenly deposited on the inner wall of the supporting body through vacuum filtration, and powder particles which are not firmly combined are removed through back flushing; and finally, the binding force between the functional film layer and the metal matrix is improved through high-temperature heat treatment. Wherein the thermal expansion coefficient difference between the metal supporting body and the functional film layer can be reduced by adding the metal powder, the metal powder is melted and diffused in the high-temperature heat treatment stage, and metallurgical bonding is formed between the functional powder and the metal substrate. The method is simple in process, and the prepared metal-based ceramic composite membrane has the advantages of being high in membrane layer binding force, not prone to falling off, high in catalytic activity, high in anti-pollution capacity, stable in operation and the like.

The invention discloses a method for purifying water by catalyzing ozonation through a nitrogen-fluorine co-doped carbon-loaded cobalt nanomaterial. Co-ZIF-8 and polytetrafluoroethylene (PTFE) are respectively used as a precursor and a fluorine source, and the nitrogen-fluorine co-doped carbon-loaded cobalt nano-catalyst is successfully prepared through an etching synchronous doping strategy. The composite material can be used for catalyzing ozone to degrade organic pollutants in water. Nitrogen doping can promote formation of a metal-nitrogen coordination structure, and decomposition of ozone on the surface of the catalyst is facilitated. Fluorine modification can significantly enhance the hydrophilicity of the composite material and accelerate the solid-liquid reaction of ozone in a solution and a catalyst interface, and the strong electron withdrawing effect of fluorine can effectively adjust the electronic structure of the catalyst and promote the generation of strong oxidizing active oxygen species, thereby achieving efficient and rapid removal of pollutants. The water treatment method solves the problem of low ozone utilization rate in a conventional catalytic ozonation process, has the advantages of high reaction rate and stable treatment effect, and has a good application prospect.

The invention relates to a high-entropy metal oxide catalyst and a preparation method and application thereof.The preparation method comprises the following steps that S1, ferric salt, cobalt salt, manganese salt, nickel salt, copper salt and organic alkaline matter are mixed to obtain a mixed solution, hydrothermal reaction is conducted, and a precursor is obtained; and S2, calcining the precursor at the temperature of 500-600 DEG C to obtain the high-entropy metal oxide catalyst. The high-entropy metal oxide catalyst uniformly doped with iron, cobalt, manganese, nickel and copper is prepared by adopting a hydrothermal reaction and calcination method, and the high-entropy metal oxide catalyst not only can efficiently catalyze ozone to remove antibiotics, but also can still keep an excellent antibiotic removal rate constant in a water body containing hetero ions and humic acid; and the anti-interference capability is excellent.

The invention discloses a composite cathode material integrating electrocatalysis and ozone oxidation functions, a preparation method and application. The composite cathode material is composed of oxidized carbon nanotubes, cuprous oxide and copper oxide. The copper loading capacity of the composite cathode material is 1-10wt.%; the diameter of the oxidized carbon nanotube is 5 to 10 nm; the mass ratio of the oxidized carbon nanotubes to the cuprous oxide to the copper oxide is (298-27): (3.0-2.5): (0-1). A composite cathode material integrating electrocatalysis and ozone oxidation functions is elaborately designed and prepared and is applied to an electrocatalytic ozone coupling system, and continuous and efficient attack on antibiotic molecules and degradation intermediates thereof is realized by utilizing multiple synergistic effects among all components of the material and in the electrocatalytic ozone process, so that the electrochemical performance of the composite cathode material is improved. Therefore, the technical bottleneck of low TOC removal rate in the traditional advanced oxidation process is broken through, and a new technical approach is provided for thoroughly eliminating the antibiotic risk in the water environment.

The invention provides a preparation method of an intercalated expanded graphite catalyst for catalyzing ozone, the catalyst and application, and belongs to the technical field of graphite materials. Firstly, expanded graphite is subjected to pre-oxidation treatment, the interlayer distance of the expanded graphite is increased, then the pretreated expanded graphite is subjected to intercalation and oxidation through an intercalation substance, an ion pair compound of trityl carbocation and heteropolyanion [P (Mo3O10) 4] 3 <-> with negative electricity is introduced into the interlayer of the expanded graphite, the compound is stably intercalated between the graphite layers, and the expanded graphite is prepared. Organic pollutants and ozone molecules in the wastewater are adsorbed, and the effective collision probability and the reaction rate between the ozone molecules and the organic pollutants are improved; finally, amine substances diethylenetriamine and triethylenetetramine are used for further treating the expanded graphite, and hydrogen bonds are combined with organic compounds such as phenols, so that the adsorption performance of the graphite is improved. The prepared catalyst is combined with ozone to realize good removal of tetracycline, phenol and COD (Chemical Oxygen Demand) in wastewater.

The application provides a method for treating organic phosphorus in tanning wastewater by electrocatalytic ozone treatment with a modified foam iron electrode as a cathode, and the method comprises at least one pair of electrodes; the electrodes comprise a modified foam iron cathode and a modified graphite felt anode, the modified foam iron cathode is modified 40ppi foam iron; the method for treating organic phosphorus in tanning wastewater is as follows: the modified foam iron cathode and the modified graphite felt anode are placed in a reactor, the cathode and the anode are connected to a direct current power supply; the wastewater containing tetramethylphosphonium sulfate to be treated is added into the reactor, and the pH value of the wastewater is controlled in the range of 5-9; the mixed gas of ozone and oxygen is continuously introduced into the reactor, and the flow rate of the mixed gas of ozone and oxygen is controlled to be 0.1-0.5L / min per liter of wastewater; the direct current power supply is started to supply power to the graphite anode and the modified foam iron cathode, and the tetramethylphosphonium sulfate in the wastewater is continuously oxidized into orthophosphate salt between the electrodes; the crystallized orthophosphate salt is separated from the wastewater, and the organic phosphorus component in the tanning wastewater is removed.

The invention discloses a catalytic ozone system based on a nano zero-valent iron-resin composite material and application, and belongs to the field of organic phosphorus wastewater treatment. The system comprises an nZVI-coated D201 catalyst, ozone and organophosphorus wastewater, the pH value of the system is 4-10, the concentration of the ozone is 5-20 mg / L, the flow rate of the ozone is 0.5-1.0 L / min, and the dosage of the nZVI-coated D201 catalyst is 0.5-2.0 g / L; the nZVI-D201 catalyst is formed in an nZVI-D201 / O3 system by loading nano zero-valent iron on the surface of D201 resin, and on one hand, organic phosphorus pollutants in wastewater are rapidly enriched by means of the excellent adsorption performance of the D201 resin; on the other hand, the nano zero-valent iron loaded on the surface of the resin can efficiently catalyze ozone to generate. OH and other active species, and the enriched organic phosphorus is catalytically oxidized into inorganic phosphorus. From the perspective of phosphorus resource recovery, inorganic phosphorus generated by oxidation can be efficiently intercepted through the adsorption effect of D201 resin, and inorganic phosphorus enriched on the resin can be desorbed into a desorption solution through a subsequent desorption process, so that the inorganic phosphorus in the desorption solution becomes a recyclable phosphorus resource form.

The invention provides a microbubble internal circulation catalytic ozonation reaction system which comprises an ozone generation unit, a catalytic ozonation unit and a tail gas recovery treatment unit which are connected in sequence, and a wastewater pipeline enters the ozonation unit through a wastewater inlet; the catalytic ozonation unit comprises a reactor main body, a central flow guide descending cylinder, a catalyst module and microbubble distributors, the central flow guide descending cylinder is arranged in the reactor main body, the liquid outlet end of the wastewater pipeline is distributed above the central flow guide descending cylinder, and the microbubble distributors are distributed on the outer side of the bottom of the central flow guide descending cylinder in a surrounding manner; the ozone generator is connected with the ozone generating unit; the catalyst module is arranged in the reactor main body and is distributed between the inner wall of the reactor main body and the central flow guide descending cylinder. An internal circulation flow field is driven by jet flow, micro-bubbles are generated in combination with an aeration technology, and gas-liquid-solid three-phase mass transfer is synergistically enhanced, so that catalytic ozonation degradation of pollutants is realized, the ozone utilization rate is increased, and the problem of traditional aeration blockage is solved.

The application discloses a preparation method and application of an ozone oxidation catalyst. 2+ The preparation method of the ozone oxidation catalyst comprises the following steps: adding a sandstone carrier, Fe, H2O2, an iron source material and wastewater into a fluidized bed reactor to obtain initial reaction liquid with pH of 4-5; swelling the sandstone carrier in the initial reaction liquid; and obtaining the sandstone carrier loaded with hydroxyl iron oxide crystals after reaction of the initial reaction liquid. The catalyst prepared by the application has a nano structure, high active component, and can realize degradation of a large category of wastewater such as coal chemical industry, coking and acrylic fiber by catalyzing ozone. The catalyst is simple and economical to prepare, has less active catalytic species dissolved in the running process, has a large pH range for degradation of the wastewater, and has the advantages of easy preparation, high efficiency, stability and low economic cost.

The application relates to the field of waste water treatment, and discloses a TFO coupling RO treatment process for high-salt low-COD coal chemical industry waste water. First, the high-salt low-COD coal chemical industry waste water is introduced into a salt-containing waste water adjusting tank to preliminarily pretreat the waste water by adjusting the water volume and the pH value; second, the water out of the adjusting tank is introduced into a flocculation and precipitation tank, a flocculant and a coagulant aid are added into the water to make the particles difficult to precipitate in the water gather each other and form flocculation bodies to precipitate with impurities; then, the supernatant after precipitation is introduced into a targeted Fenton reactor, catalytic ozone is used to generate a targeted active species to realize targeted removal of small-molecule organic matters; next, the water after the targeted oxidation is introduced into a sodium bed system and a reverse osmosis system to remove salts and macromolecular organic matters; finally, the water is further purified through a multi-medium filter to remove micro particles and bacteria which cannot be removed. The water quality of the water out of the application meets the discharge standard.

The application provides a preparation method, a catalyst and application of an intercalation expanded graphite catalyst for catalyzing ozone, and belongs to the technical field of graphite materials. First, the expanded graphite is subjected to pre-oxidation treatment to increase the interlayer distance of the expanded graphite, then the pretreated expanded graphite is subjected to intercalation and oxidation through an intercalation substance, and an ion pair compound of triphenylmethyl carbon cation and negatively charged heteropolyanion [P(Mo3O 10 )4] 3‑ is introduced between the layers of the expanded graphite, the compound is stably intercalated between the layers of the graphite, organic pollutants and ozone molecules in waste water are adsorbed, and the effective collision probability and reaction rate between ozone molecules and organic pollutants are improved; finally, the expanded graphite is further treated by using amine substances diethylenetriamine and triethylenetetramine, hydrogen bonds are combined with organic compounds such as phenols, and the adsorption performance of the graphite is improved. The catalyst prepared by the application realizes good removal of tetracycline, phenol and COD in waste water in combination with ozone.

Systems and methods for reducing obstructions in an exhaust line of a sub-atmospheric chemical vapor deposition (SACVD) system are disclosed. Such obstruction may occur due to the reaction of a silicon precursor with ozone, which forms solid particles in the exhaust line. A catalytic apparatus is provided which catalyzes the decomposition of ozone (O3) to oxygen (O2). Due to the lower reactivity of O2, the formation of solid particles is reduced.

The present application belongs to the field of wastewater treatment, and provides a treatment method for refractory wastewater. Specifically, the method comprises three process steps of pretreatment, biochemical treatment and advanced treatment, and sequentially carries out pretreatment, biochemical treatment and advanced treatment on the refractory wastewater. In the pretreatment stage, the fluidized bed crystallization technology and Fenton-like reaction are used to obtain crystalline bodies with high catalytic activity and improve the B / C of the wastewater; the effluent from the pretreatment is subjected to neutralization, degassing, flocculation and precipitation and other treatment processes, and the degradable acetic acid remaining in the pretreatment stage is used as a carbon source to re-enter the biochemical treatment stage, which is treated by the AO process method, and has low carbon and economy; finally, the wastewater after the biochemical treatment enters the advanced treatment stage, and the high catalytic activity of the waste catalytic crystalline bodies in the pretreatment stage is used to carry out catalytic ozone micro-bubble treatment on the wastewater to reach the national discharge and reuse standards, and the waste catalysts can also be resourcefully utilized. The wastewater treatment process provided by the present application has high treatment efficiency and low cost, runs through the whole wastewater treatment process, and has a wide application prospect.

The invention discloses a CaO-C-Co catalyst material and a preparation method thereof. The preparation method comprises the following steps: (1) synthesizing a Ca-MOF precursor by adopting a solvothermal reaction; and (2) impregnating the Ca-MOF precursor with a soluble cobalt salt solution, drying, and calcining in an inert atmosphere at 750-850 DEG C for 2-3 hours to obtain the CaO-C-Co catalyst material. The CaO-C-Co catalyst material disclosed by the invention shows excellent cycle stability while efficiently catalyzing ozone to degrade organic pollutants, has important significance in promoting the practical application of the technology, and can be applied to catalyzing ozone to oxidize and degrade the organic pollutants in water.

The application discloses a treatment system and method for turbulent catalytic ozone oxidation of wastewater. The treatment system utilizes the strong power provided by water-gas mixing to make the fluid in the intense turbulent motion of swirling and tumbling, improves the gas-liquid-solid contact and mixing behavior, realizes the fluidization of the large-density powder catalyst, promotes the interphase mass transfer, and greatly improves the treatment efficiency of pollutants. The application can fully utilize the catalytic advantages of the ozone catalyst and the strong power provided by water-gas mixing, effectively solve the fluid dynamics inertia of the micron zero-valent iron powder as the ozone catalyst caused by the large density, and enhance the mass transfer between the solid-liquid-gas phases.

The present application belongs to the technical field of catalyst preparation, and relates to a preparation method and application of a black and odorous water sludge-based carbon catalyst. The preparation method of the black and odorous water sludge-based carbon catalyst comprises the following steps: (1) mixing, drying and grinding black and odorous water sludge and non-sludge biomass materials to obtain carbon-increased sludge; and (2) activating the carbon-increased sludge with an activator, pyrolyzing and cooling the carbon-increased sludge in an inert atmosphere to obtain the black and odorous water sludge-based carbon catalyst. The present application improves the carbon content of sludge carbon, reduces the yield, ash content, conductivity and element ratios of H / C, N / C and O / C of sludge carbon by co-pyrolyzing black water sludge and non-sludge biomass materials. In addition, co-pyrolysis reduces the content and toxicity of heavy metals in biochar. Co-pyrolysis of black and odorous water sludge and non-sludge biomass materials rich in C elements not only simultaneously disposes the sludge and non-sludge biomass materials, but also improves the C element content of biochar, thereby improving the catalytic ozone activity of the biochar.

The invention discloses a wastewater treatment system and process for POE alcohol production, and the wastewater treatment system comprises a pretreatment unit, a deep oxidation unit, an efficient biodegradation unit, a catalytic oxidation electrolysis coupling unit, a salt-tolerant composite biological treatment unit and a post-treatment unit which are sequentially connected in series, the pretreatment unit comprises an adjusting tank, a demulsification reaction tank and a sedimentation tank which are sequentially connected in series, the deep oxidation unit comprises a supported bimetallic catalytic oxidation reactor, and the efficient biodegradation unit comprises an anaerobic bioreactor and an aerobic bioreactor. The catalytic oxidation and electrolysis coupling unit comprises a catalytic ozonation reactor and an iron-carbon micro-electrolysis reactor, the salt-tolerant composite biological treatment unit comprises a salt-tolerant hydrolysis acidification pool and a sequencing batch moving bed bio-membrane reactor, and the post-treatment unit comprises a precision filter and a disinfection pool. The method has the advantages that an integrated treatment system is constructed, process parameters are optimized, efficient purification of wastewater is achieved, it is ensured that effluent reaches the standard and is discharged, meanwhile, the treatment cost is reduced, and secondary pollution is reduced.

A device for gas purification treatment may include: a light oxidation reactor, a light source being disposed in the light oxidation reactor, the light source being configured to emit first light and second light, the light oxidation reactor being configured to perform a first-stage purification treatment on a gas under irradiation of the first light; a catalytic ozone oxidation reactor configured for second-stage purification treatment of the gas; a photocatalytic reactor configured to perform a third-stage purification treatment on the gas under irradiation of the second light; wherein, the photocatalytic reactor is adjacent to the light oxide reactor, and the photocatalytic reactor and the light oxide reactor are separated by a light transmittance component, so that the second light passes through the light transmittance component into the photocatalytic reactor.

The invention relates to an iron-nitrogen-carbon-based magnetic material for synchronously removing combined pollution of iron and ibuprofen drugs in underground water and an application of the iron-nitrogen-carbon-based magnetic material. The material can stably adsorb iron ions in water through a surface carboxyl complexing way, and the adsorbed iron ions are used as a medium to fix carboxyl groups of ibuprofen drugs on the surface of the material, so that the effect of synchronously adsorbing and removing iron and ibuprofen drugs in water is realized. The method is suitable for synchronous adsorption removal of polymorphic iron and various ibuprofen drugs; an N site and a defect site are successfully introduced in a material synthesis stage and jointly play a role in catalyzing ozone to generate strong oxidation free radicals. The iron-nitrogen-carbon-based magnetic material is combined with O3, so that the drug removal rate and the ozone utilization rate can be greatly improved, and meanwhile, the regeneration of drug adsorption sites is completed. On the basis, under the working condition that 0.4 mg / L ozone is introduced, more than 90% of the 1.0 mg / L ibuprofen medicine can be removed by only consuming 5 minutes in the process.

The invention relates to a petrochemical biochemical effluent treatment method which comprises the following steps: S1, introducing petrochemical biochemical effluent to be treated into a membrane catalytic ozonation unit for treatment to obtain a first product; s2, the first product water is introduced into a biological activated carbon unit and sequentially flows through an activated carbon catalytic ozonation zone, a biological activated carbon aerobic zone and a biological activated carbon anoxic zone to be treated, and second product water is obtained. The problems of low ozone utilization rate, long treatment process flow, high overall energy consumption and the like in the existing biochemical effluent treatment and recycling process in the petrochemical industry can be solved.

The invention discloses an o-nitrophenol production wastewater treatment process aiming at environmental protection, and particularly relates to the technical field of industrial wastewater treatment and resource recycling, the o-nitrophenol production wastewater treatment process comprises the following steps: S1, pretreating wastewater and selectively extracting and recycling o-nitrophenol, S2, carrying out catalytic hydrogenation reduction on the pretreated wastewater to convert a nitro compound into an amino compound, and S3, carrying out catalytic hydrogenation reduction on the amino compound to obtain the o-nitrophenol production wastewater. The method comprises the following steps: S1, carrying out a hydrolysis reaction, S3, carrying out a directional hydrolysis reaction, and converting an amino compound into a recoverable chemical or an easily degradable intermediate, S4, carrying out deep biochemical and catalytic ozonation treatment on the hydrolyzed effluent, and S5, carrying out reverse osmosis treatment to realize the reuse of the produced water. According to the method, core pollutants are directionally converted into high-value resources, efficient purification, resource recovery and near-zero emission of wastewater are achieved, meanwhile, waste gas and waste residues are cooperatively treated, and the method has outstanding environmental and economic benefits.

This utility model discloses a catalytic ozone oxidation deep treatment device for papermaking wastewater, including a base, a treatment mechanism mounted on the top of the base, a cover plate mounted on the top of the treatment mechanism, an inlet pipe and a pressure relief valve mounted on the cover plate, and a transfer mechanism and an air pipe installed inside the treatment mechanism. The air pipe is inserted into the treatment mechanism and connected to an aeration disc. This utility model achieves highly efficient synergy between catalytic oxidation and adsorption processes by integrating an aeration disc and a filter cartridge within the treatment tank. It eliminates the need for multiple devices connected in series to complete deep wastewater treatment, reducing connecting pipelines and floor space. The nozzle of the transfer mechanism enhances the contact between wastewater and ozone and activated carbon, strengthening the reaction and adsorption effects. The filter cartridge is easily replaceable via a threaded sleeve, ensuring continuous and stable operation. This device improves pollutant removal efficiency and water purification effect while reducing equipment costs and maintenance difficulty, significantly improving overall work efficiency and possessing strong practical value.

The advanced wastewater treatment device comprises a primary adsorption tank, a catalytic ozonation tank and a secondary adsorption tank, a water outlet is formed in the top of the primary adsorption tank, and the primary adsorption tank is connected with a water inlet in the bottom of the catalytic ozonation tank through a pipeline; a water outlet pipeline of the first-stage adsorption tank is provided with a valve, a reflux pipeline and a reflux pump and is used for adjusting water flow and realizing partial reflux; a water outlet is formed in the top of the catalytic ozonation tank and connected with a water inlet in the bottom of the secondary adsorption tank through a pipeline, an exhaust port, a barometer and an exhaust pipeline with a valve are arranged at the top of the catalytic ozonation tank, and the exhaust pipeline is connected with a tail gas treatment device to ensure that waste gas is effectively treated. According to the advanced wastewater treatment system based on adsorption coupled catalytic oxidation, through coupling of two-stage adsorption and catalytic ozonation, the removal effect on new pollutants is remarkably improved, and the advanced wastewater treatment system is particularly suitable for treatment of refractory organics.

The invention provides an aluminum-based ozone heterogeneous catalyst as well as a preparation method and application thereof, and belongs to the technical field of wastewater treatment. The aluminum-based ozone heterogeneous catalyst is prepared from the following raw materials in parts by weight: 70-80 parts of an aluminum source compound, 5-10 parts of a binder, 5-10 parts of a pore forming agent, 1-5 parts of an auxiliary agent and 8-12 parts of an active component. According to the aluminum-based ozone heterogeneous catalyst disclosed by the invention, the active components are uniformly distributed in the catalyst, and the synergistic effect among the active components catalyzes ozone oxidation, so that the ozone oxidation catalysis efficiency of the catalyst is greatly improved, and the ozone utilization rate in a whole reaction system is improved.

The application relates to a (Fe, Mn) Al2O4 material capable of simultaneously strengthening adsorption and decomposing ozone and capable of magnetic separation and a preparation method and application thereof, and the process is as follows: Al2O3 is added to a NaOH solution, stirred, transferred into a PTFE hydrothermal reactor, and subjected to hydrothermal reaction in an oven. The obtained NaAlO2 powder is dissolved in deionized water, hydrochloric acid is added, and stirring is uniformly carried out, and the solution is used after being changed from turbidity to clarity, and is marked as A solution. Iron nitrate, manganese nitrate and deionized water are mixed, and are marked as B solution. The AB solution is mixed, ammonia water is added dropwise until the pH value is 10-11, and stirring is uniformly carried out. Then, the solution is transferred into the PTFE hydrothermal reactor, and subjected to hydrothermal reaction in the oven. After reaction, the material is centrifuged, washed, dried, and heated to obtain the (Fe, Mn) Al2O4 material. The preparation method is simple, the cost is low, the prepared material can simultaneously strengthen adsorption and decompose ozone to generate free radicals, rapidly degrade organic pollutants, and can be separated and fixed through magnetism after completing catalytic ozone oxidation of pollutants, secondary pollution is avoided, and the material can be applied to degradation of organic pollutants in tap water or municipal sewage.

The application discloses a method for catalyzing low-concentration ozone to oxidize NO by using ammonium salt modified SAPO-34 molecular sieve, which uses SAPO-34 molecular sieve as a carrier, uses an ion exchange method to prepare an ammonium salt modified molecular sieve catalyst NH4-SAPO-34, and applies the catalyst to a reaction of catalyzing low-concentration ozone to oxidize NO. The method avoids the introduction of metal elements, is simple in preparation method, reduces the production cost of the catalyst, and makes the prepared catalyst more environment-friendly. Moreover, the catalyst can be repeatedly used by being prepared again, further reduces the production cost, and fills the blank of the related research on non-metal modified molecular sieves in a catalytic ozone oxidation system.

The application belongs to the technical field of catalyst materials, and particularly relates to SiO2@Graphitized carbon@MnO x (abbreviated as SiO2@C@MnO x ) nanomaterial, a preparation method and application thereof. The nanomaterial takes silica inert material as an initial carrier, and can be prepared into the SiO2@C@MnO x nanomaterial through simple hydrothermal-heat treatment by adjusting glucose solution concentration, manganese ion concentration of a manganese salt solution, hydrothermal reaction and heat treatment temperature. The material disclosed by the application weakens the strong interaction of Si-O-Mn bonds between manganese oxide and silica on the surface of silica by introducing graphitized carbon layers, improves the abundance of low-valence Mn, promotes the interface catalytic activity of the material, in addition, the carbon layer can also improve the local hydrophobic property and electron transport efficiency of the material as a catalyst, and has the ability of efficiently catalyzing ozone oxidation degradation of organic pollutants in water.

The invention relates to a technology for preparing a nitrogen-doped modified enteromorpha-based Fe / N biochar catalyst based on a calcination method, and particularly relates to a preparation technology of the nitrogen-doped modified enteromorpha-based Fe / N biochar catalyst, which is characterized in that the nitrogen-doped modified enteromorpha-based Fe / N biochar catalyst is prepared by using enteromorpha as a precursor and melamine as an external nitrogen source through the calcination method; the nitrogen-doped modified enteromorpha-based Fe / N biochar is prepared in a high-temperature oxygen-free environment. According to the preparation method of the nitrogen-doped modified enteromorpha-based Fe / N biochar catalyst developed by the method, the enteromorpha-based catalyst is modified by utilizing an external nitrogen source (melamine), the nitrogen-doped modified enteromorpha-based Fe / N biochar catalyst (N-EP-X) is prepared, more nitrogen coordination active sites are provided for iron in enteromorpha by introducing a secondary nitrogen source, and the nitrogen-doped modified enteromorpha-based Fe / N biochar catalyst is prepared. The formation of large-size iron clusters and iron particles is avoided, so that iron is more uniformly dispersed on the carbon substrate, and the number of active sites on the surface of the catalyst is further increased. The performance and catalytic activity of the carbon material are improved by doping nitrogen, so that the prepared catalyst shows excellent performance in the process of catalyzing ozone to oxidize and degrade organic pollutants which are difficult to degrade.