100 results about "Catalytic degradation" patented technology

The application discloses a method for treating organic pollutant wastewater by using manganese monoxide-graphite diacetylene nano-confined catalytic material to activate persulfate, the method is to degrade and treat organic pollutant wastewater by using manganese monoxide-graphite diacetylene nano-confined catalytic material as a catalyst for activating persulfate, and the nano-confined catalytic material comprises graphite diacetylene nanosheets, and manganese monoxide nanoparticles are confined between the layered structures of the graphite diacetylene nanosheets.The method has the advantages of rich active sites, fast electron transfer and stable structure, so that the catalytic degradation system is not only high in efficiency, but also strong in adaptability, and shows good degradation effect on various organic pollutants, and has the advantages of simple process, convenient operation, high treatment efficiency, good removal effect, strong adaptability, green environmental protection and the like, and has important promoting significance for deep purification of organic pollutant wastewater.

The application discloses a composite metal catalyst for catalytic degradation of VOCs at low temperature and a preparation method thereof, and belongs to the field of environmental protection catalysis technology. The composite metal catalyst comprises the following components in percentage by weight: 5-25% of a multi-component composite metal oxide, 65-90% of modified mesoporous zeolite, 2-6% of a composite additive, and 1-3% of a high-temperature-resistant binder. The multi-component composite metal oxide is a copper / manganese / cerium / zirconium quaternary composite oxide, and the molar ratio of copper, manganese, cerium and zirconium is 1:(0.8-1.2):(0.5-0.8):(0.2-0.5). The modified mesoporous zeolite is ZSM-5 mesoporous zeolite which is modified by rare earth ions and an amphoteric surfactant. The application adopts the copper / manganese / cerium / zirconium quaternary composite metal oxide as an active component, the introduction of cerium and zirconium forms a solid solution structure, greatly improves the oxygen storage capacity and the redox performance of the active component, and the synergistic effect of copper and manganese and cerium and zirconium significantly reduces the oxidation and decomposition temperature of VOCs.

The application discloses a graphene / Hf6Ta2O 17 The application relates to a hierarchical porous composite aerogel, a preparation method thereof and application, and relates to the technical field of functional porous materials. In the application, hafnium sources and tantalum sources are dissolved in acid, then transferred and mixed by using an alcohol solvent to prepare a precursor, and then the precursor is combined with an oxidized graphene dispersion liquid to construct a sol system, and finally, the product is prepared through hydrothermal self-assembly, solvent replacement and freeze drying. The aerogel obtained in the application has a hierarchical porous structure, and has excellent adsorption capacity and catalytic degradation efficiency for toxic agents. The material is stable in performance under extreme environments of high humidity (10%-95% RH) and variable air pressure (0.5-2 atm), overcomes the defects that traditional materials are easily disturbed by environments, and has a wide application prospect in the fields of efficient air purification and complex environment protection.

This invention belongs to the field of waste gas treatment technology, specifically relating to an absorbent for treating organic waste gas and its preparation method. The absorbent for treating organic waste gas comprises the following raw materials in parts by weight: 10-25 parts graphene oxide, 20-30 parts catalyst, 25-40 parts functionalized ionic liquid, and 10-20 parts N-isopropylacrylamide. In the catalyst prepared by this invention, the synergistic effect of the cerium source, cobalt source, and sodium selenate forms a stable heterojunction structure through hydrothermal and thermal treatment processes, optimizing the number and distribution of catalytic active sites and enhancing catalytic oxidation capacity. After oxidation and modification, the graphene oxide enhances its dispersion stability, firmly anchoring the catalyst particles to the graphene surface and accelerating electron transfer in the catalytic reaction. This results in the prepared absorbent for treating organic waste gas possessing high adsorption capacity, efficient catalytic degradation ability, and cycle stability.

This invention relates to a method for the batch preparation of cobalt-based heterojunction catalysts, the cobalt-based heterojunction catalysts themselves, and their applications. The invention utilizes a green, environmentally friendly, and simple ball milling and calcination method to prepare cobalt-based heterojunction catalysts. This batch preparation method avoids organic solvent pollution, is low-cost, and environmentally friendly. The prepared cobalt-based heterojunction catalysts exhibit high specific surface area and uniform metal site dispersion, enhance catalytic degradation activity against various pollutants in water treatment, and demonstrate good cycle stability, making them suitable for industrial wastewater treatment.

The utility model belongs to the field of catalyst performance detection discloses a kind of photocatalytic degradation formaldehyde device, including, transparent reactor, its inside has reactor chamber, reactor chamber extends along the extension direction of transparent reactor itself, and open on the upper surface of transparent reactor, ultraviolet lamp is fixedly installed on the inside lateral wall of reactor chamber, the inside bottom of reactor chamber has several installation grooves, and one installation groove is detachably installed with photocatalytic net board, photocatalytic net board is respectively detachably installed in several installation grooves, to change the distance between ultraviolet lamp and photocatalytic net board.In the utility model, photocatalytic net board is respectively inserted and pulled type installation in different installation grooves in transparent reactor, change the distance of this photocatalytic net board in transparent reactor, adjust the intensity of illumination by adjusting the distance between ultraviolet lamp and catalyst on photocatalytic net board, the structure of the scheme is simple and the effect is obvious, it is beneficial to study the performance of catalyst under the condition of low cost.

The invention belongs to the technical field of environmental pollution treatment and water treatment, and particularly relates to a method for degrading organic pollutants by coupling a nano confinement catalytic membrane with micro-nano bubbles. The method comprises the following steps: adding micro-nano bubble water and an oxidizing agent into an organic pollutant solution, regulating the pH value to prepare a pretreatment mixed solution, and enabling the pretreatment mixed solution to pass through a nano confinement catalytic membrane to catalytically degrade the organic pollutants, the nano confinement catalytic membrane comprises an organic polymer membrane substrate and a catalyst loaded in the organic polymer membrane substrate; the loading capacity of the catalyst is 5 to 30 mg. The problems that antibiotics are difficult to degrade, pollutant concentration is easily caused by membrane separation, a catalyst is difficult to recycle, and membrane flux and catalytic activity are difficult to balance are solved, the method has the advantages of being high in degradation efficiency, stable in membrane flux, easy to recycle the catalyst and wide in application range, and wastewater containing organic pollutants can be efficiently treated.

The application relates to a preparation method of a rare earth high-entropy catalyst for photocatalytic degradation of VOCs, and relates to a catalyst preparation method for catalytic degradation of VOCs. The method has important research necessity for catalytic degradation of VOCs by introducing a multi-element synergistic regulation strategy. The application is applied to promoting catalytic oxidation and decomposition of volatile organic compounds (VOCs). A series of xMnHEOs-K catalysts are prepared by a co-precipitation one-step synthesis method, KMnO4 is doped into rare earth oxides, and the xMnHEOs-K catalysts are obtained through filtration, washing, drying and calcination. The xMnHEOs-K catalysts can realize photocatalytic oxidation and decomposition of VOCs at a low temperature, and have excellent stability and water resistance in toluene, acetone and multi-component VOCs.

The application relates to the technical field of building, in particular to a high-molecular composite material for catalytic degradation of formaldehyde and a preparation method thereof, which comprises the following steps: determining the adding amount of a stabilizer based on the melt flow rate and the oxidation induction period of random copolymerized polypropylene, and modifying the stabilizer to obtain a first intermediate product; determining the preset feeding proportion of the first intermediate product based on the oxidation induction period of the first intermediate product; heating and blending raw materials in a screw extruder to obtain a second intermediate product, determining a mixed state characteristic value based on the density and the agglomeration index of the metal oxide, and determining whether the mixed state of the second intermediate product meets the standard, and checking the mixed state when the mixed state does not meet the standard; adjusting the screw rotation speed of the screw extruder based on the melt color uniformity feedback of the second intermediate product; and cooling and forming the second intermediate product after extrusion to obtain a product. The application solves the problem that the uneven dispersion of nanoscale metal oxide particles leads to the local degradation of formaldehyde.

This invention discloses a defect-state indium oxide photothermal catalyst, its preparation method, and its application. The catalyst is indium oxide (In₂O) containing oxygen vacancies. 3‑x The catalyst exhibits a co-doped cubic and hexagonal crystal structure. The oxygen defects include oxygen vacancies and unsaturated In(III) sites associated with these vacancies. The preparation method involves a solvothermal reaction of indium nitrate and urea in a 50-95 v / v% ethanol aqueous solution to obtain the precursor c / h-InOOH. The precursor is then calcined to obtain c / h-In2O3. Finally, c / h-In2O3 is heat-treated with a reducing agent to construct oxygen defects. This invention, through crystal doping and the synergistic structure of oxygen defects in In2O3, enables the catalyst to possess full-spectrum absorption capabilities, more efficient carrier separation capabilities, and photothermal synergistic capabilities, thereby improving the efficiency of photothermal catalytic degradation of PFOA.

This invention relates to the field of chemical / energy fuel technology, specifically disclosing a method for upgrading and recycling waste plastics to prepare renewable liquid hydrocarbon fuels. This method integrates steps such as pretreatment, solvent dissolution, impurity separation, catalytic degradation, and product separation and purification. On one hand, it precisely controls the molecular chain breaking process of various types of waste plastics through catalytic degradation, ensuring that the carbon number of the degradation products is mainly concentrated in the C5~C5 range. 18+ Within this range, high-quality components, mainly liquid hydrocarbon fractions, are obtained that can be directly used as recycled gasoline and sustainable aviation fuel. On the other hand, through the efficient separation and recycling of solvents and ionic liquid catalysts, the closed-loop use of solvents / ionic liquid catalysts and the high selective enrichment of products are realized, forming a closed-loop path of "waste plastics - liquid fuels - carbon cycle", realizing the high-value and low-carbon transformation of waste plastics into renewable liquid hydrocarbon fuels.

The application discloses a kind of Graphene Oxide / Bi 12 TiO 20 Preparation method and application of composite photocatalyst, to solve the existing Bi 12 TiO 20 Photocatalyst photo-generated carrier is fast, and it is easy to produce miscellaneous phase in preparation, leading to the technical problems such as low catalytic activity. First, Bi 12 TiO 20 Powder, such as Bi / Ti=4:1 or 6:1, then the Bi 12 TiO 20 Powder is compounded with single-layer GO dispersion under the action of ultrasonic wave. The Graphene Oxide / Bi 12 TiO 20 Composite photocatalyst prepared by the method is mixed with methyl orange (MO) solution under simulated visible light for 20 minutes, and the degradation rate of methyl orange reaches 98.2%, and the first-order kinetic reaction rate constant k value is 0.2167 min ‑1 , which can be widely applied in the field of visible light catalytic degradation of organic pollutants.

The application belongs to the technical field of environmental electrocatalytic electrode preparation, and particularly relates to a preparation method of a magnetic spinel adsorption electrode and application thereof. The specific preparation steps are as follows: 1) dispersing the magnetic spinel catalyst in an electrolyte to form a suspension system; 2) constructing a double-electrode electrochemical system in the suspension system by taking foamed nickel as a cathode; and 3) stirring the suspension system, performing electrolysis reaction, and obtaining the magnetic spinel adsorption electrode after drying. The prepared adsorption electrode does not need to add an additional binder to realize the fixation of the magnetic spinel catalyst on the foamed nickel substrate, overcomes the problem of sharp reduction of the number of active sites and conductivity caused by the binder, and greatly improves the electrode catalytic degradation capacity. In addition, the preparation method does not need to consume additional binders and organic solvents, can effectively reduce the synthesis cost of the spinel electrode and reduce the discharge of waste liquid, and is an environmentally friendly catalyst synthesis method.

The application belongs to the technical field of catalyst preparation, and relates to a preparation method and application of a CoCuNiPtRu high-entropy alloy nanoparticle catalyst. A one-pot wet chemical method is used to uniformly mix 4-amino pyridine solvent and metal precursors, and then ascorbic acid is quickly added for reduction in an oil bath at 95 DEG C. After reaction, washing and drying, the catalyst is obtained. The method has the advantages of simple process and convenient operation. The obtained catalyst has high activity and selectivity in catalytic degradation of polylactic acid waste plastics under alkaline conditions, can efficiently upgrade and convert the polylactic acid waste plastics into acetic acid, provides a new way for resource utilization of waste plastics, and has good environmental protection and resource recycling prospects.

The application discloses a hollow spherical composite catalyst Pt / MnO2 / MnCo2O4, wherein the MnCo2O4 is a hollow sphere with a spinel structure composed of manganese and cobalt double transition metal oxides, the diameter of the hollow sphere is distributed in 1-2 mu m, and the hollow sphere has a porous structure with many cavities in the inside. MnO2 nanosheet microspheres are uniformly attached to the MnCo2O4, and the diameter of the MnO2 nanosheet microspheres is 95-105 nm. Pt nanoparticles with a particle size of 2-20 nm are uniformly loaded on the MnCo2O4 and the MnO2. The Pt / MnO2 / MnCo2O4 is synthesized by a solvothermal method and calcination in an air bath to synthesize a hollow spherical MnCo2O4 carrier, and then the MnO2 and the Pt nanoparticles are loaded on the surface of the MnCo2O4 by a deposition-precipitation method and an in-situ reduction method. The hollow spherical composite catalyst can catalyze degradation of tetracycline in polluted water at room temperature, and the catalytic efficiency can still be maintained after repeated use.

This invention relates to a CuO / TiO2 photothermal catalyst, its preparation method and application, and a method for photothermal catalytic degradation of plastics. The catalyst is prepared using an impregnation-calcination method. The preparation process involves uniformly mixing a soluble copper salt precursor solution with a titanium dioxide support, followed by ultrasonication, settling, drying, and calcination to obtain the CuO / TiO2 catalyst. Plastic is then mixed with the CuO / TiO2 photothermal catalyst and placed in a reactor. A photothermal catalytic reaction is carried out under light and heating conditions. The reactants are collected to obtain liquid fuel oil; the liquid fuel oil is a gasoline fraction C5-C. 12 Aviation fuel fraction C8-C 16 Or diesel fraction C 10 -C 23 One or more of the following. Compared with the prior art, the present invention has the advantages of achieving efficient catalytic degradation of polyethylene plastics under photothermal synergistic conditions and directional conversion to liquid fuel.

The application provides an integrated ceramic filter tube and a preparation method and application thereof. The integrated ceramic filter tube comprises a base body having a cavity structure, a pipe wall of the base body being formed by fiber lapping, and a high-entropy active component dispersed on the surface and / or inside of the pipe wall, and the high-entropy active component comprises metal oxides formed by five or more transition metals. The integrated ceramic filter tube breaks through the traditional segmented processing mode of dust removal first and catalytic purification later, integrates the functions of particulate matter capture and NO x , VOCs catalytic degradation into a single ceramic filter tube, and can simultaneously remove dust, nitrogen oxides and volatile organic compounds in industrial flue gas such as coking, steel and cement. The design simplifies the industrial tail gas treatment process, reduces the equipment area and system pipeline connection cost, reduces the difficulty of engineering transformation of the industrial end, and realizes efficient and collaborative removal of multiple pollutants.

The application discloses a zeolite molecular sieve-based catalyst and a preparation method and application thereof. The zeolite molecular sieve-based catalyst has low harmful element leaching, multiple active sites and high performance, and has excellent catalytic degradation performance and environment-friendly characteristics in environmental purification applications.

The application provides a method for removing pollutants in water by utilizing a local thermal effect to promote a Fenton-like reaction, and uses a ruthenium-doped titanium dioxide nanobelt (TNB-Ru) as a catalyst; the TNB-Ru is prepared by using commercial anatase titanium dioxide nanoparticles as raw materials, first, a hydroxylated titanium dioxide nanobelt is prepared by using an alkaline hydrothermal method, then the titanium dioxide nanobelt is dispersed in a ruthenium chloride ethanol solution, and the ruthenium is loaded on the titanium dioxide nanobelt by using the anchoring effect of the surface hydroxyl group, and finally the target material is obtained. The TNB-Ru prepared by the method has excellent catalytic degradation performance, which is mainly due to the fact that the ruthenium dispersed on the titanium dioxide nanobelt generates a local plasmonic resonance effect to form a local high-temperature environment under visible light irradiation, and the Fenton-like reaction is accelerated.

The application belongs to the technical field of organic wastewater treatment, and discloses a carbon material with good catalytic activity for catalytic degradation of COD as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing biomass powder and a phosphorus-containing acidic solution, placing them in a sealed container for hydrothermal reaction, performing solid-liquid separation after the reaction is completed, and drying to obtain a hydrothermal carbon intermediate; (2) dispersing the hydrothermal carbon intermediate in a solvent, adding an amino donor and an aldehyde group donor, adjusting the pH value to alkaline for in-situ polymerization, so that the polymer is coated on the surface of the hydrothermal carbon intermediate, and after drying, a resin-coated precursor is obtained; (3) performing activation treatment on the resin-coated precursor to obtain the carbon material for catalytic degradation of COD.

This invention discloses a nitrogen-doped carbon geopolymer / metal mesh composite membrane. Using amino acids as both nitrogen and carbon sources, the amino acids are loaded onto the membrane through immersion. The alkalinity of the geopolymer is used as an activator, and the nitrogen-doped carbon geopolymer / metal mesh composite membrane is prepared by high-temperature carbonization. This invention uses green and low-cost amino acids as both carbon and nitrogen sources, allowing the amino acids to coordinate with metal ions to obtain nitrogen-doped carbon with a higher specific surface area. This improves the membrane's surface structure, increases active sites, and effectively enhances the membrane's catalytic degradation performance for organic pollutants, achieving, in some cases, complete removal.

A copper-carbon composite material for dehalogenation of chlorine-containing waste enameled wire varnish pyrolysis tail gas and its preparation method belong to the field of environmental catalysis. This invention first involves carbonizing, oxidizing, activating, and molding buckwheat hull powder after sieving to obtain shaped activated carbon (Shape-OAC); then, modified shaped activated carbon (H-Shape-OAC) is prepared using an acid modification method; Cu(NO3)2 solution is dropwise added to the surface of H-Shape-OAC and vacuum dried and calcined to obtain a secondary modified copper-carbon composite material (CuO@H-Shape-OAC); waste enameled wire varnish is mixed with CuO@H-Shape-OAC and subjected to a first thermal degradation dechlorination and a second adsorption-degradation to remove chlorinated VOCs (CVOCs). The resulting composite material can provide protons (H... + This method promotes the breaking of C-Cl bonds in CVOCs and accelerates the dechlorination reaction to generate HCl. It also reduces the gas flow pressure drop and ensures uniform contact of the reaction medium with CuO, thereby enhancing the catalytic degradation of CVOCs and facilitating the production of high-purity regenerated Cu. This method is less prone to introducing other metallic impurities, and the reaction conditions are mild, environmentally friendly, and exhibit excellent catalytic performance, good stability, and long lifespan.

This invention discloses a method and apparatus for enhancing microbial catalytic degradation of chlorinated hydrocarbons in groundwater using a pulsed electric field, relating to the field of groundwater pollution remediation technology. By introducing microbial stimulants, including nutrients and electron donors, into the polluted groundwater area to enhance the activity of functional microorganisms, and applying a pulsed electric field to create a dynamic potential gradient, the method promotes pollutant migration and microbial metabolism, achieving a stepwise degradation of chlorinated hydrocarbons from highly chlorinated intermediates to low-chlorinated intermediates and ultimately to non-toxic alkanes. Simultaneously, monitoring data such as pollutant concentration, environmental parameters, and microbial activity are collected, and the pulsed electric field parameters and stimulant addition strategy are dynamically adjusted based on this data to match external stimulation with dechlorination requirements. This promotes the continuous and efficient conversion of highly chlorinated hydrocarbons to low-chlorinated hydrocarbons and ultimately to non-toxic alkanes, improving electron utilization efficiency and system stability, shortening the remediation cycle, and reducing energy consumption and the risk of secondary pollution.

The application provides a water body pollutant piezoelectric catalytic degradation device, which has the structure of a reactor cavity (1). A top water inlet (2) is arranged at the top of the reactor cavity (1), and a bottom water outlet (3) is arranged at the bottom of the reactor cavity (1). A two-dimensional agitation zone, a one-dimensional penetration zone and a zero-dimensional fluidization zone are arranged in the cavity of the reactor cavity (1), and a bubble fluidization excitation system is arranged outside the cavity of the reactor cavity (1). A hydraulic pulse circulation driving system is arranged outside the cavity of the reactor cavity (1) and is communicated with the top water inlet (2) and the bottom water outlet (3). The two-dimensional agitation zone, the one-dimensional penetration zone and the zero-dimensional fluidization zone are connected in a multi-dimensional cascade structure, so that the overall treatment efficiency of different forms of pollutants can be improved.

This application discloses a self-catalytically degradable PLA composite material and its preparation method. The PLA composite material comprises the following raw materials in parts by weight: 100 parts polylactic acid, 10-20 parts modified ethylene-acrylate-glycidyl methacrylate copolymer, and 1-3 parts catalytic degradation agent; wherein the modified ethylene-acrylate-glycidyl methacrylate copolymer contains cyclodextrin grafted into the glycidyl methacrylate segments. This application effectively solves the technical problems of insufficient interfacial compatibility between existing polylactic acid toughening systems and polylactic acid substrates, and the resulting strength loss during toughening.

The present application relates to the field of catalytic materials, in particular to a cerium lanthanum rare earth-based carbon-nitrogen-oxygen quinary eutectic nanomaterial, a preparation method and application thereof. The cerium lanthanum rare earth-based carbon-nitrogen-oxygen quinary eutectic nanomaterial is an ultrathin flake-shaped amorphous / short-range ordered quinary lattice eutectic structure formed by atom-level eutectic of cerium, lanthanum, carbon, nitrogen and oxygen, has excellent abnormal temperature stability, and has no decay in phase and catalytic activity after being placed at normal temperature and pressure for more than 30 days. The material has a catalytic degradation efficiency of biuret of more than 99%, has low energy consumption in the preparation process and is easy to be scaled up industrially, can be widely applied to the fields of urea solution purification and automobile exhaust SCR system anti-crystallization, and solves the industry bottleneck of difficult degradation of biuret.

This invention discloses a sulfur-deficient iron disulfide catalyst, its preparation method, and its applications. The catalyst is prepared by a hydrothermal reaction of an NH2-MIL-101(Fe) precursor with a sulfur source. This catalyst possesses abundant sulfur vacancies, numerous active sites, high catalytic activity, and strong cycle stability. It can be used as an electro-Fenton catalyst for the efficient degradation of antibiotics. Its preparation method is simple, low-cost, and suitable for industrial production.

The application belongs to the technical field of filter protection materials, and discloses a preparation method of a dust-toxin synergistic protection filter membrane loaded with a toxic gas catalyst. The method first prepares an electret nanofiber support layer through electrospinning, and then constructs a spider web-like nanofiber filter layer by using non-solvent induced phase separation and vapor induced phase separation; subsequently, a catalyst fiber is prepared by compounding a catalytically active component with a fiber-forming polymer, and a three-dimensional catalytic fiber network layer is constructed by directional freezing, freeze drying and crosslinking solidification; finally, a hydrophobic pre-filter layer, an electret nanospider filter layer and a three-dimensional catalytic fiber network layer are compounded to form a dust-toxin synergistic protection filter membrane, realizing the synergistic effect of particle pollutant filtration and toxic gas catalytic degradation. The application is expected to solve the problem that traditional filter materials are difficult to balance high efficiency filtration and continuous purification, and provides a new technical approach for the preparation of a new type of high-efficiency low-resistance dust-toxin synergistic protection filter material.