6282results about "Physical/chemical process catalysts" patented technology

The invention discloses a catalyst used for preparing acrylic acid and butyl ester by the dehydration of butyl lactate and a preparation method thereof. The catalyst is a composite catalyst, comprising a main catalyst A and auxiliary catalysts B, C, D and E, wherein, A is calcium sulphate, B is sulphuric acid, C is phosphate, D is alkaline matter and E is promoter. The preparation method comprises the steps as follows: five compositions A, B, C, D and E are sufficiently mixed, baked for 2-10 hours at the temperature of 200-800DEG C and formed for standby. The catalyst has high catalytic activation; under the catalysis of the catalyst, the molar yield reaches 75.1 percent and the molar selectivity of the acrylic acid and butyl ester reaches 71.5 percent. The preparation method has the advantages that the crystal structure of the main catalyst can be improved so as to be beneficial for carrying out the reaction; and the introduction of different auxiliary catalysts and quantities is helpful to improve the conversion ratio of the raw material and the product selectivity and is beneficial for improving the strength of the catalyst.

The invention relates to the technical field of biocatalysts, in particular to a FeCo-NC bimetallic monatomic nano-enzyme as well as a preparation method and application thereof. The preparation method of the nano enzyme comprises the following steps: preparing Co-ZIF-8 from zinc nitrate, cobalt nitrate and 2-methylimidazole; the Co-ZIF-8 and ferric chloride are used for preparing the FeCo-NC bimetallic monatomic nano-enzyme, the molar ratio of the zinc nitrate to the cobalt nitrate is (20-30): 1, and the molar ratio of the cobalt nitrate to the ferric chloride is (2-6): 1. The nano-enzyme prepared by the embodiment of the invention is of a monatomic structure, has double-enzyme activity, can simultaneously simulate catalase and NADH oxidase, and has the capability of removing active oxygen.

The invention discloses a cobalt-loaded covalent organic framework material as well as a preparation method and application thereof, and belongs to the technical field of catalyst preparation. The cobalt-loaded covalent organic framework material is prepared by taking a carbonized covalent organic framework as a matrix and cobalt nitrate hexahydrate as a cobalt source, reducing by using a sodium borohydride methanol solution, and introducing transition metal cobalt into the framework through room-temperature impregnation and thermal reduction processes. In the material, active components comprise Co0 and Co < 2 + > which are uniformly distributed on a carrier. Moreover, the metal cobalt is stably loaded in a carbon skeleton through the bonding effect of heteroatoms such as nitrogen and carbon, so that the stability, the catalytic activity and the durability of the metal cobalt are effectively improved, the dissolution risk of the metal cobalt is reduced, the hidden danger of environmental pollution is reduced, and efficient catalytic activity is shown in the aspect of catalyzing and activating peroxymonosulfate to degrade organic pollutants; and good recycling stability is achieved.

The invention provides a preparation method of macroporous high-hydrothermal-stability aluminum oxide and pseudo-boehmite, and the preparation method of the pseudo-boehmite comprises the following steps: step 1, adding an aluminum salt solution and an alkali solution into a rotating liquid membrane reactor at the same time, and nucleating at 20-30 DEG C to obtain nucleating slurry; wherein the rotating speed of the rotating liquid film reactor is 500 to 1200 rpm, and the stator-rotor gap of the rotating liquid film reactor is 0.1 to 0.3 mm; and step 2, transferring the nucleation slurry into a crystallization reaction device, crystallizing at 70-90 DEG C, and then carrying out solid-liquid separation and drying to obtain the pseudo-boehmite. The most probable pore size of the aluminum oxide prepared by the method is 6-12nm, the specific surface area is 150-600m < 2 > / g, and the aluminum oxide can still keep higher specific surface area after being subjected to hydrothermal treatment for 120 hours.

The objective of the present invention is to provide a method for preparing cremation crystals, the method using phosphoric acid extracted from cremated remains as a catalyst in the heat treatment of ashes so that transparent cremation crystals can be prepared only with components of skeletal remains derived from a single individual, and using only skeletal remains of a single individual through the control of the classification ratio of raw bone powder and phosphorus-extracted bone powder, and the like, so that the amount of phosphorus in the crystals is controlled, thereby enabling cremation crystals transparency to be controlled, and thus aesthetic requirements of consumers are satisfied and use as various kinds of jewelry is also facilitated.

The invention belongs to the technical field of photocatalysts, and particularly relates to a coal gasification fine slag doped g-C3N4 photocatalyst and a preparation method and application thereof.The coal gasification fine slag and g-C3N4 are evenly mixed and calcined, the coal gasification fine slag is doped to the surface of g-C3N4, and the coal gasification fine slag doped g-C3N4 photocatalyst is constructed and used for degrading methylene blue under visible light; the separation of photon-generated carriers is promoted, the hole electron recombination efficiency is reduced, and the photocatalytic activity is improved. According to the method, the utilization way of the coal gasification slag is widened, and meanwhile, the dye wastewater is effectively degraded.

The invention relates to the technical field of chemical degradation of waste polyester, and discloses a titanium-silicon compound catalyst, a preparation method thereof and a method for depolymerizing polyethylene glycol terephthalate. The preparation method of the titanium-silicon compound catalyst comprises the following steps: (1) preparing a titanium compound, an orthosilicate compound and a solvent, and reacting with an organic acid solution to obtain a solution; and (2) carrying out post-treatment on the solution to obtain the titanium-silicon compound catalyst. The catalyst has the characteristics of high PET depolymerization rate, low polymerization degree in a depolymerization product, high purity of a depolymerization product bis (2-hydroxyethyl) terephthalate (BHET) and low titanium residue in a target product in a PET degradation reaction. The BHET obtained by the method disclosed by the invention can be directly used for preparing PET polyester products or other high-added-value products, and closed-loop cyclic utilization of PET is realized.

The invention discloses a supported double perovskite photocatalytic material which is prepared by the following steps: putting copper nanoparticles and double perovskite Cs2NaBiCl6 into a water-absolute ethyl alcohol mixed solution, carrying out ultrasonic dispersion, heating the dispersion solution to 55-65 DEG C, carrying out cooling crystallization at a rate of 1-2 DEG C / min, completing the reaction when the temperature is reduced to 25 DEG C, carrying out solid-liquid separation on the reaction product, and washing and drying the solid, the Cu nanoparticle-loaded double-perovskite photocatalytic material is applied to photocatalytic reduction of CO2, the catalyst has the characteristics of high reduction catalysis efficiency and good selectivity, the performance is stable after repeated cyclic utilization, and the material disclosed by the invention is simple in preparation process, high in efficiency and suitable for large-scale production and market popularization and application.

The invention discloses a Fe-MOF derivative / biochar nano composite material as well as a preparation method and application thereof, and belongs to the field of degradation of organic pollutants in a water body. The invention aims to solve the problems of unstable structure, easy agglomeration and the like at high temperature. The preparation method comprises the following steps: by taking an Fe-MOF derivative as a precursor and charcoal as a carrier material, carrying out in-situ synthesis on Fe-MOF, and carrying out high-temperature calcination on the surface of charcoal (BC). The metal carbon-based composite material prepared by the method shows excellent catalytic performance in catalytic degradation of tetracycline in a water body. Meanwhile, the prepared multiphase composite catalytic material has good stability and cycle performance.

The invention provides a method for synthesizing adiponitrile through selective ammoxidation of cyclohexene oxide. The invention aims to simulate and optimize the process of synthesizing adiponitrile from cyclohexene oxide by a one-step direct ammoxidation method to develop a novel multiphase composite metal vanadium-based oxide catalyst, the composition of the catalyst is CoaVbPcModMNOx / TiO2, the active elements of the catalyst comprise vanadium element V, cobalt element Co, phosphorus element P and molybdenum element Mo, M is an auxiliary metal element (Mn, Cr, Fe or Ni), and N is an alkali metal (Na, K or Cs); the value range of a is 0.2 to 1.2; the value range of b is 0.8 to 1.5; the value range of c is 0.1 to 0.23; the value range of d is 0.07 to 0.35; x is the oxygen atom proportion required by the metal oxidation valence state. The catalyst has the advantages of simple preparation, good cycling stability, high yield and the like. The yield and the product purity of the adiponitrile are improved, the energy consumption in the production process of the adiponitrile is reduced, and the breakthrough of the production technology of the adiponitrile is realized.

The invention discloses a method for preparing a graphdiynyl material based on a Sonogashira-Hagihara cross-coupling reaction, and belongs to the technical field of Sonogashira-Hagihara cross-coupling Reaction. According to the method, halogenated aromatic hydrocarbon and an alkynyl compound are used as raw materials, a palladium catalyst / copper catalyst is used as a catalytic system, and the graphdiynyl material is prepared by regulating the alkalinity and the polarity of a solvent. According to the present invention, the graphitized alkynyl material is obtained through the in-situ removal of the protection group on the acetylenic bond of the alkynyl compound and the Sonogashira-Hagihara cross coupling with the halogenated aromatic hydrocarbon, such that the method can select the variety of the halogenated aromatic hydrocarbon, the cost is low, the side reaction during the polymerization process is less, the variety of the graphitized alkynyl can be easily expanded, the development and the utilization of the high-quality graphitized alkynyl film can be easily achieved, and the method can be used for the preparation of the graphitized alkynyl material. The preparation cost of graphdiyne is reduced.

The invention discloses application of a metal ion doped graphene oxide film in catalytic synthesis of Schiff base. The metal ion doped graphene oxide film comprises a graphene oxide film and metal ions loaded on the surface and between layers of the graphene oxide film. Metal ions in the metal ion-doped graphene oxide film induce reactant molecule orientation through a cation-pi effect, and a confinement channel formed between the metal ions and GO is combined, so that a front line molecular orbit of a reactant for catalytic synthesis of the Schiff base is better matched, the molecular freedom degree is reduced, and the Schiff base catalytic synthesis efficiency is improved. And the molecules are subjected to bond breaking and bond forming reactions in a specific orientation. Molecules are orderly arranged among layers and flow to pass through a two-dimensional nano confinement channel provided by the graphene oxide nanosheets among the film layers, so that the reaction activation energy is reduced, and efficient catalytic synthesis of various Schiff bases is realized at room temperature. Meanwhile, by regulating and controlling the chemical microstructure of the membrane material, the catalytic reaction efficiency and the reaction selectivity can be effectively improved.

The invention discloses a high-entropy alloy / nitrogen-doped carbon nano catalytic material and a preparation method and application thereof.The nano catalytic material comprises a high-entropy alloy composed of five non-noble metals including Fe, Co, Ni, Cu and Mn and nitrogen-doped carbon synthesized with the assistance of MOF, the non-noble metal high-entropy alloy serves as a main body material, the nitrogen-doped carbon serves as a carrier material, and the nitrogen-doped carbon serves as a carrier material. A non-noble metal high-entropy alloy is loaded on nitrogen-doped carbon to construct a novel nano catalytic material, and the novel nano catalytic material is used for activating peroxydisulfate to remove antibiotics in a water body. The catalyst has the advantages of excellent chemical stability, good reusability and the like and is a novel nano catalytic material with efficient catalytic performance and environment-friendly characteristics, and the preparation method has the advantages of being simple in operation process, green, environmentally friendly, economical, feasible and the like and can be used for large-scale preparation.

The invention relates to a preparation method of Pt monatomic nano-enzyme and application of Pt monatomic nano-enzyme in cardiac troponin I. The preparation method comprises the following steps: 1) ultrasonically dispersing cobalt salt, selenium powder, chloroplatinic acid, urea and sodium chloride in an alcohol solvent, heating and stirring until the solvent is completely volatilized to obtain a solid mixture, and grinding the solid mixture into powder; and 2) placing the powder in a heating device, carrying out Joule heat treatment in an air atmosphere, washing a reactant, and carrying out vacuum drying to obtain the Pt monatomic nano-enzyme. Se doping is introduced in the one-step chemical reaction process to construct oxygen vacancies, rapid heating and structural shaping are achieved in combination with Joule heat treatment, the Se-doped Co3O4-loaded Pt monatomic catalyst is obtained, the oxygen vacancies and Se doping sites are synergistically used as anchoring sites, Pt monatomic atoms are effectively fixed, and the loading capacity and dispersity of the Pt monatomic atoms are improved. The obtained material shows excellent POD-like enzyme activity, can be used for constructing a high-sensitivity colorimetric immunoassay system, and realizes rapid and accurate detection of cTnI.

The invention provides a functional graded porous carbon microsphere and a preparation method and application thereof, the preparation method comprises the following steps: S1, mixing a soft template, a phenolic compound, a cross-linking agent and a basic catalyst, and reacting to obtain a thermosetting phenolic resin microsphere; s2, carrying out pre-carbonization treatment on the thermosetting phenolic resin microspheres to obtain a carbonized material; s3, performing physical activation on the carbonized material to obtain graded porous carbon microspheres; s4, performing heat treatment on the graded porous carbon microspheres to obtain functionalized graded porous carbon microspheres; the preparation method has the characteristics of simple process, environmental protection and economical efficiency, the functionalized porous carbon microspheres prepared by the method are uniform in morphology, and the pore volume, pore diameter and pore structure of the functionalized graded porous carbon microspheres can be accurately regulated and controlled, so that the functionalized graded porous carbon microspheres meeting application requirements are obtained.

The invention relates to the technical field of honeycomb ceramic materials, in particular to a cordierite honeycomb ceramic material with low heat capacity and high specific surface area and a preparation method thereof. The pug comprises an inorganic solid component, an organic component and water, the inorganic solid component comprises narrow-particle-size-distribution spherical magnesium hydroxide, spherical aluminum hydroxide and spherical fused silicon dioxide; the particle size D50 of the narrow-particle-size-distribution spherical magnesium hydroxide powder is 0.1-2 microns, and the particle size D97 is smaller than or equal to 20 microns; the particle size D50 of the spherical aluminum hydroxide powder is 1-6 [mu] m, and the particle size D97 is less than or equal to 20 [mu] m; the particle size D50 of the spherical fused silica powder is 6-12 [mu] m, the particle size D97 is less than or equal to 20 [mu] m, and the sphericity is greater than or equal to 98%. The method is low in extrusion pressure, the obtained material is high in pore density, meanwhile, high porosity can be achieved without adding a pore-forming agent, and the ultra-thin wall is achieved; the composite material can be applied to various requirements of low heat capacity and high specific surface area.

Provided are: a multilayer carbon nanotube assembly having high conductivity; a multilayer carbon nanotube dispersion liquid; a conductive material; an electrode; a secondary battery; a planar assembly; a filter; an electromagnetic wave shield; and a pellicle for extreme ultraviolet rays.　Provided are: a multilayer carbon nanotube assembly including a multilayer carbon nanotube that has a median diameter of 80 nm or more in a volume-based particle size distribution obtained by a centrifugal sedimentation method when measured as an aqueous dispersion liquid at a concentration of 0.004% by mass, and has a rate of change in transmittance measured by a centrifugal sedimentation method of 0.3% or less per hour when measured as an aqueous dispersion liquid at a concentration of 0.2% by mass; a multilayer carbon nanotube dispersion liquid; a conductive material; an electrode; a secondary battery; a planar assembly; a filter; an electromagnetic wave shield; and a pellicle for extreme ultraviolet rays.

The invention relates to the technical field of nano-enzymes, in particular to a Fe monatomic / Pt nano-cluster nano-enzyme as well as a preparation method and application thereof. The invention relates to a preparation method of Fe monatomic / Pt nanocluster nano-enzyme, which comprises the following steps: dispersing graphite phase carbon nitride in water, adding polyphenol and amine, stirring for 10-14 hours, carrying out suction filtration, and drying to obtain a polyphenol amine coated graphite phase carbon nitride precursor; dispersing the graphite-phase carbon nitride precursor in water, adding an iron source and a platinum source, stirring for 10-14 hours, and performing suction filtration, drying, carbonization, acid pickling, centrifugation and drying to obtain the Fe monatomic / Pt nanocluster nanoenzyme. The Fe monatomic / Pt nanocluster nano-enzyme is prepared by the method disclosed by the invention. The invention relates to an application of a Fe monatomic / Pt nanocluster nano-enzyme in pesticide detection. Compared with a single Fe monatomic or Pt nanocluster nano-enzyme, the Fe monatomic / Pt nanocluster nano-enzyme provided by the invention can generate a synergistic effect and has higher catalytic activity.

The invention relates to a synthetic method of brominated polystyrene with high thermal stability. The synthetic method comprises the following steps: S01, dissolving polystyrene in a halogenated hydrocarbon solvent in a reaction bottle to obtain a polystyrene solution; s02, adding aluminum chloride and bromine into another reaction bottle; s03, introducing hydrogen bromide gas into the reaction bottle in S02, and starting stirring to react at room temperature; s04, after the reaction in the step S03 is finished, reducing the temperature of the polystyrene solution in the step S01 to the reaction temperature, starting stirring, adding a free radical inhibitor, and dropwise adding the bromine and catalyst mixed solution obtained by the reaction in the step S03 into the polystyrene solution; s05, after dropwise adding is finished, adjusting the temperature to the heat preservation temperature, and carrying out heat preservation reaction for a period of time; and S06, after the heat preservation is finished, carrying out post-treatment to obtain the brominated polystyrene. According to the synthetic method of brominated polystyrene, the halogenation phenomenon of a main chain can be inhibited, the use of a catalyst is reduced, and the thermal stability of brominated polystyrene is improved.

The invention is applicable to the technical field of porous materials, and relates to multistage ordered macroporous-mesoporous titanium dioxide and a preparation method and application thereof, and the preparation method comprises the following steps: (1) preparing a superstructure photonic crystal solid; (2) forming a light yellow solution with the concentration of 0.2-0.5 mol / L; and (3) adding the superstructure photonic crystal solid in the step (1) into the light yellow solution in the step (2) to prepare the multistage ordered macroporous-mesoporous titanium dioxide. The preparation method has the beneficial effects that in the preparation method of the multistage ordered macroporous-mesoporous titanium dioxide disclosed by the invention, the stability of a mesoporous superstructure unit can be ensured, and accurate and perfect copying of a pore channel structure can be realized; the separation efficiency of photo-generated charges and photo-generated holes of the titanium dioxide disclosed by the invention in photocatalytic water decomposition is greatly improved, and due to the multi-stage ordered macroporous-mesoporous structure, multiple scattering of incident light in a porous frame can be ensured, so that the efficiency of hydrogen production by photocatalytic water decomposition is improved.

The invention discloses a preparation method and application of a Fe2O3-Bi4TaO8Br photo-Fenton catalyst, and belongs to the technical field of advanced oxidation treatment. The specific preparation method comprises the following steps: preparing a Bi4TaO8Br nanosheet by virtue of a molten salt method, and then loading Fe2O3 on the Bi4TaO8Br nanosheet by virtue of a hydrothermal method, so as to obtain the Fe2O3-Bi4TaO8Br photo-Fenton catalyst. The prepared Fe2O3-Bi4TaO8Br photo-Fenton catalyst shows efficient photo-Fenton degradation performance on tetracycline (TC) under the visible light condition, meanwhile, the preparation process is safe, simple, convenient and efficient, and potential environment purification application prospects are achieved.

The invention provides a bismuth oxybromide-based photocatalytic material, and a preparation method and application thereof, and the preparation method comprises the following steps: (1) dissolving bismuth nitrate pentahydrate and polyvinylpyrrolidone in an alcoholic solution, rapidly stirring to obtain a mixed solution, adding potassium bromide into the mixed solution, and continuing to fully stir for reaction; and (2) transferring the mixed solution into a reaction kettle with a polytetrafluoroethylene lining, carrying out solvothermal reaction, carrying out centrifugal suction filtration separation on the obtained product, washing and drying to obtain the photocatalytic material. The bismuth oxybromide-based photocatalytic material, the preparation method and the application have the advantages that the bismuth oxybromide-based photocatalytic material is excellent in performance and high in visible light response capability, dyes can be quickly degraded in a short time, and the treatment efficiency of printing and dyeing wastewater can be obviously improved.

The invention discloses a method for preparing a carbon monoxide oxidation catalyst by using a waste vanadium-titanium catalyst and electroplating sludge, which realizes the mutual reaction of metal components in the electroplating sludge and components in the waste vanadium-titanium catalyst through the synergistic effect of various physical and chemical treatment methods and additives in the whole preparation process. The complex multi-metal catalyst can be used for photo-catalytic oxidation of carbon monoxide, has a remarkable oxidation effect and has a good application prospect.

The invention discloses a bio-based isosorbide carbonate plasticizer and a preparation method and application thereof, and relates to the technical field of plastic processing assistants.The preparation method of the bio-based isosorbide carbonate plasticizer comprises the steps that in the atmosphere of protective gas, diester carbonate and isosorbide serve as raw materials to be subjected to transesterification with a catalyst; and after the reaction is completed, carrying out post-treatment to obtain the isosorbide carbonate plasticizer. The isosorbide carbonate plasticizer disclosed by the invention can effectively reduce the melting temperature and melt viscosity of a material, improve the processability of the material, increase the flexibility of the material and improve the optical transmittance of the material. The preparation method disclosed by the invention has the characteristics of being simple in process, green and environment-friendly, easily available in raw materials, easy in catalyst separation and relatively high in product yield, and is an efficient and environment-friendly preparation process of isosorbide carbonate.

The invention relates to high-peptization pseudo-boehmite and a preparation method thereof, and belongs to the technical field of porous aluminum oxide preparation. The method comprises the following steps: obtaining slurry containing pseudo-boehmite colloidal particles; mixing the slurry containing the pseudo-boehmite colloidal particles with an alkaline auxiliary agent to obtain a mixed solution; and aging the mixed solution at a set temperature so as to enable the alkaline additive to perform surface modification on the pseudo-boehmite colloidal particles, thereby obtaining the high-peptizing-solubility pseudo-boehmite. According to the invention, the alkaline auxiliary agent acts on the colloidal particle surface of the pseudo-boehmite at a proper temperature, so that the pore structure of the pseudo-boehmite is maintained, and meanwhile, the pseudo-boehmite with high peptizing property is constructed.

The invention discloses an ultrathin hydrophilic / hydrophobic ZnO-CuS-CC photo-thermal material as well as a preparation method and application thereof, and belongs to the technical field of photo-thermal evaporators. The ultrathin hydrophilic / hydrophobic ZnO-CuS (at) CC photo-thermal material comprises a hydrophobic substrate, an ultrathin ZnO-CuS hydrophilic layer grows on the upper surface of the hydrophobic substrate, the ultrathin ZnO-CuS hydrophilic layer comprises CuS nanosheets and ZnO nanoparticles attached to the CuS nanosheets, a large number of micro-pores and cavities are formed in the surface of the ultrathin ZnO-CuS hydrophilic layer, light traps are constructed by the micro-pores and the cavities, and the micro-pores and the cavities are formed in the surface of the ultrathin ZnO-CuS hydrophilic layer. The ZnO nanoparticles reduce light reflection and improve the light absorptivity. The photo-thermal evaporator prepared from the material can solve the technical problems of how to prevent salt deposition, effectively treat organic pollutants and realize efficient evaporation in the prior art.

The invention relates to the technical field of biodiesel hydrogenation catalysts, and particularly discloses a hydrogenation catalyst of organic bentonite loaded cerium-zirconium solid solution and nickel-molybdenum phosphide as well as a preparation method and application of the hydrogenation catalyst. The hydrogenation catalyst with the organic bentonite loaded with the cerium-zirconium solid solution and the nickel-molybdenum phosphide comprises an organic bentonite carrier, the cerium-zirconium solid solution and the nickel-molybdenum phosphide, the loading capacity of the cerium-zirconium solid solution on the organic bentonite carrier is 2-2.5 wt%; the cerium-zirconium solid solution comprises cerium dioxide and zirconium dioxide; the loading capacity of the nickel molybdenum phosphide on the organic bentonite carrier is 10-15 wt%; and the nickel molybdenum phosphide is Ni2Mo3P. The organobentonite carrier provides an acid site and promotes deoxidation path optimization, the layered structure of the organobentonite carrier can limit the cerium-zirconium solid solution and the nickel-molybdenum phosphide, and organic groups are also embedded into the layered structure, so that the organic compatibility of the organobentonite carrier to biodiesel is improved, and the catalytic efficiency is improved. The cerium-zirconium solid solution provides oxygen vacancies, promotes hydrogenation / deoxidation, and improves the thermal stability and sintering resistance of the catalyst.

The detachable reactor comprises a water supply pipe, a communicating pipe and a plurality of barrel sets, each barrel set is formed by splicing a top cover, an upper barrel, an upper grating net, a main barrel, a lower grating net, a lower barrel and a bottom cover, and the bottom cover is connected with a water inlet pipe, a water drainage pipe and a series connection pipe through a first reversing valve; the top cover is provided with a water outlet pipe with a valve and flushing pipes, the water supply pipe is provided with a water supply pump and a box body, the box body is provided with a sewage pipe and a dosing mechanism, the communicating pipe is communicated with the series connection pipes and the flushing pipes and provided with a second reversing valve, inner cavities of the upper cylinder and the lower cylinder are filled with filter materials, and an inner cavity of the main cylinder is filled with catalytic filler. Sewage is filtered and catalytically decomposed by using the filter material and the catalytic filler in the cylinder group, the cylinder group is convenient to disassemble for cleaning and replacement, and series connection, parallel connection and backwashing work of the plurality of cylinder groups can be realized through cooperation of each pipeline and each valve, so that the sewage treatment effect is ensured, and the sewage treatment efficiency is improved.

The invention discloses a self-driven bio-electro-Fenton sewage treatment method based on granular sludge electroactivity domestication. The sewage treatment method comprises the following steps: firstly, inoculating anaerobic granular sludge into an anode chamber of a microbial fuel cell, fixing a clustered carbon fiber electrode in a biological anode chamber as an electrode collector, taking a cathode as an oxygen reduction cathode, and performing electrochemical enrichment to obtain electroactive granular sludge; then, preparing an iron-cobalt diatomic catalyst from the nitrogen-doped graphene oxide, cobalt phthalocyanine and iron phthalocyanine; and finally, adding the iron-cobalt diatomic catalyst into the electroactive granular sludge to form a hybrid structure, controlling dissolved oxygen in a reaction system, and degrading organic pollutants by adopting an SBR (sequencing batch reactor). The biological electro-Fenton technology has a better effect of removing refractory organic pollutants, and compared with a traditional electro-Fenton method, the self-Fenton technology can achieve the activity of molecular oxygen without external electric energy input.

Methods for preparing a salt of urolithin A and, in turn, urolithin A. Combining in an alkaline aqueous solution a copper-containing catalyst, 2-bromo-5-hydroxybenzoic acid, and resorcinol produces a salt of urolithin A. Urolithin A has been prepared by protonating a salt of the compound.