235 results about "Macropore" patented technology

The invention belongs to the technical field of fishpond filtering materials, and discloses a preparation method of a fishpond filtering composite carbon material and the fishpond filtering composite carbon material. The preparation method of the fishpond filtering composite carbon material comprises the following steps: 1) performing kneading and extrusion molding treatment on mixed powder comprising modified bentonite, biomass powder, diatomite, a pore forming agent and a photocatalyst and a binder solution to obtain a green body; 2) drying the green body, performing multi-section programmed heating carbonization in an inert atmosphere, and cooling to obtain a porous carbon ceramic framework loaded with a photocatalyst; 3, the porous carbon ceramic framework is soaked in the graphene oxide dispersion liquid, and the fishpond filtering composite carbon material.The fishpond filtering composite carbon material is obtained.The preparation temperature is relatively low, the fishpond filtering composite carbon material has a developed macropore-mesopore-micropore graded pore structure, and efficient physical adsorption, photocatalytic degradation and microbial biofilm culturing functions can be achieved at the same time.

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

The invention relates to the technical field of proportioning control, and discloses an intelligent proportioning control method for activated carbon and a deodorant in an air purification system, which comprises the following steps of: dividing the pore size distribution of the activated carbon into three types of micropores, mesopores and macropores, and obtaining pollutant response vectors of various typical pollutants and consumption weight vectors of the pollutants to the three types of pore sizes; constructing an agent mapping knowledge base; environmental pollutants are monitored in real time, a current pollutant response vector is obtained, and an activated carbon dynamic ability portrait is generated by matching a knowledge base; identifying a new pollutant event, acquiring a response vector and an aperture consumption weight of the new pollutant event, performing efficiency prediction calculation with the dynamic capability portrait, executing three-section decision logic according to a prediction result, and outputting dynamic ratio data of the activated carbon and the deodorant; accurate prediction of functional saturation of the activated carbon is realized through multi-dimensional capability characterization, purification efficiency reduction caused by'saturation illusion 'is effectively avoided, and the comprehensive purification efficiency of an air purification system is remarkably improved.

The invention discloses a method for improving backboard PTH macropore explosion, which comprises the following steps: a production board is provided, an inner circuit of the production board comprises at least one thick circuit layer with the thickness of 2oz, and the rest inner circuit layers are thin circuit layers with the thickness of 1oz; a drilling position with the outer diameter of 4.5 mm is arranged on the production plate; a copper disc with the outer diameter larger than 4.5 mm is arranged at the position, corresponding to the drilling position, in the thick circuit layer, and a circle of copper-free first isolating ring is formed between the periphery of the copper disc and the surrounding copper face. Large holes are drilled in the corresponding drilling positions, so that the holes are metalized; filling resin in the large holes, curing, and removing the resin protruding out of the plate surface through a grinding plate; an outer layer circuit is manufactured on the production board, a hole ring is manufactured around the large hole, a copper-free second isolating ring is formed between the periphery of the hole ring and the peripheral copper surface, and at least one connecting rib for connecting the hole ring and the peripheral copper surface is arranged between the hole ring and the peripheral copper surface. The method provided by the invention solves the problems that the substrate is leaked from the orifice after board grinding and the board is exploded after reflow soldering.

The invention discloses a high-internal-phase emulsion and a graded porous material prepared from the high-internal-phase emulsion, the high-internal-phase emulsion comprises an oil phase and a water phase, the oil phase comprises a polymeric monomer, a crosslinking monomer, a foaming pore-forming auxiliary agent, an emulsifier and an initiator; according to the invention, the foaming pore-forming auxiliary agent is introduced into the high internal phase emulsion with a water-in-oil (W / O) structure, and the foaming pore-forming auxiliary agent is uniformly dispersed in an oil phase, so that the emulsification of the high internal phase emulsion is not influenced, and the integrity of a first-level foam skeleton structure formed after curing is not influenced; meanwhile, the foaming pore-forming auxiliary agent can be decomposed or volatilized at the polymerization temperature, gas is formed, pores are formed, and a large number of communicated micropores are formed in the continuous support, so that the obtained porous material has a first-stage macroporous structure and a second-stage microporous structure at the same time.

The invention relates to the technical field of synthesis of inorganic porous materials, in particular to a hierarchical pore ZSM-5 molecular sieve and a synthesis method thereof.The method comprises the steps that an aqueous solution of a guiding agent serves as a solvent, an aluminum source is dissolved in the solvent to form a mixed solution, a chelating agent and a silicon source are added into the mixed solution, the chelating agent and the silicon source react to form a chelate, seed crystals are added, and the hierarchical pore ZSM-5 molecular sieve is obtained. According to the present invention, the guiding agent can be adsorbed on the surface of the seed crystal to obtain the mixed gel, and the hierarchical pore ZSM-5 molecular sieve is obtained after the hydrothermal reaction of the mixed gel, and the synthesized hierarchical pore ZSM-5 molecular sieve has the typical MFI type micropore channel, the micropore-mesopore-macropore combined hierarchical pore structure and the ultra-large particle size of 10-35 [mu] m, the method has a huge application prospect in the chemical fields of macromolecular catalysis, adsorption and the like.

The invention provides a nitrogen-doped hierarchical pore carbon material as well as a preparation method and application thereof, and the preparation method comprises the following steps: sequentially dissolving urea, alkali metal hydroxide and / or a pore-forming agent in water to obtain a mixed solution, cooling the mixed solution, adding cellulose-based biomass, and dissolving the cellulose-based biomass to obtain transparent sol; freezing the transparent sol into a solid, and performing vacuum freeze drying to obtain a white loose solid; mixing and grinding the liquid polymeric monomer and the white loose solid, and performing heat treatment to obtain a solid product; and carbonizing the solid product in an inert atmosphere, and then pickling and washing the carbonized product. According to the preparation method, chain-shaped arrangement in cellulose-based biomass molecules is converted into three-dimensional net-shaped arrangement through dissolution, macropores are formed, a macropore framework is kept stable and does not collapse in the carbonization process through polymerization reaction, and the formed hierarchical pore carbon material has a micropore / mesopore / macropore coexisting three-dimensional structure and controllable specific surface area and pore size distribution; meanwhile, in-situ nitrogen doping can also be realized.

The application relates to the technical field of waste gas treatment, and discloses an activated carbon material, a preparation method and application thereof, and a method for removing and recycling sulfur dioxide in sulfur-containing waste gas. The CO2-TPD test spectrum of the activated carbon material simultaneously contains weak alkaline centers in the range of 80-120 DEG C and medium-strong alkaline centers in the range of 180-260 DEG C, the maximum peak height in the range of 180-260 DEG C is greater than 2000 muV; the activated carbon material has a pore volume ratio of macropores (greater than 100 nm) of more than 70%, an ash content of less than 2%, a high desulfurization rate, good regeneration performance, a SO2 removal rate of more than 99.5%, and an activity stability of more than 99% in 1000 hours.

The invention provides a fuel cell ORR catalyst and a preparation method and application thereof. The fuel cell ORR catalyst comprises a nitrogen-doped porous carbon core, a nitrogen-doped porous carbon coating layer arranged on the surface of the nitrogen-doped porous carbon core, and doped metal simple substances distributed in pore channels of the nitrogen-doped porous carbon core and the nitrogen-doped porous carbon coating layer, the ratio of micropores in the nitrogen-doped porous carbon core is gt; the total proportion of mesopores and macropores in the nitrogen-doped porous carbon core; the ratio of micropores in the nitrogen-doped porous carbon coating layer is lt; the total ratio of mesopores to macropores in the nitrogen-doped porous carbon coating layer is 1: 1. The nitrogen-doped porous carbon structure monatomic catalyst with multiple micropores inside and multiple mesopores / macropores outside is obtained through gradient pore channel design in space in combination with a CVD coating technology, and dissolution and loss of metal elementary substances are greatly inhibited while the catalytic activity of the catalyst is guaranteed, so that the service life of the catalyst is prolonged.

The invention belongs to the field of geological monitoring, and discloses a loess macropore seepage observation device and method based on a loess digital reconstruction body, and the loess macropore seepage observation device comprises the loess digital reconstruction body, a coloring agent container and a water discharging bottle; the bottom of the loess digital reconstruction body is provided with a permeable stone layer, and the top is provided with a hermetically connected top cover; a plurality of image acquisition devices are arranged around the loess digital reconstruction body; one sides of the drainage bottle and the permeable stone layer are communicated with the bottom of the coloring agent container; the first end of the three-way pipe is communicated with the interior of the top cover, the second end of the three-way pipe is provided with a pressure meter, and the third end of the three-way pipe is communicated with the atmosphere. The loess digital reconstruction body duplicates the macropore structure of the loess sample, the water flow migration process in the macropores of the loess digital reconstruction body can be rapidly observed, the water-driven gas process in the macropores of the loess digital reconstruction body can be rapidly determined, the working efficiency is high, the device is flexible and detachable, and the cost is low. The problem that the three-dimensional migration process of the water flow in the unsaturated loess macropores is difficult to accurately capture at present can be effectively solved.

This application proposes a method for preparing gradient-pore structured biochar for soil remediation microbial loading, relating to the field of biomass resource utilization technology. The preparation method includes: pyrolyzing biomass raw materials at high temperature and then cooling to obtain biochar embryos; dissolving surfactants in water to prepare an impregnation solution; impregnating the biochar embryos in the impregnation solution and drying to obtain a mesoporous template; dispersing starch in water, heating, and adding the mesoporous template while stirring, reacting, and then cooling, settling, and drying to obtain a macroporous template; and calcining the macroporous template under an inert atmosphere using a gradient heating process to obtain biochar with a gradient-pore structure. This application, through synergistic regulation of raw material composition, pretreatment process, and programmed pyrolysis activation process, achieves for the first time a continuous gradient distribution of pore size from the outside to the inside ("macropore → mesopore → micropore") within a single biochar particle, significantly improving its performance as a microbial carrier.

The invention relates to a preparation method of a three-dimensional graded porous carbon material, and belongs to the technical field of porous carbon materials. The preparation method comprises the following steps: mixing polyether polyol (R2305) and polymethylene polyphenyl isocyanate (PM200) according to a ratio, heating in a water bath kettle at a constant temperature to form a polyurethane mixed precursor, adding mixed powder of silicone oil, an activating agent and glucose into the precursor, uniformly mixing by mechanical stirring, then adding a catalyst, continuously uniformly stirring, and carrying out vacuum drying to obtain the polyurethane composite material. And finally, adding a certain amount of water as a foaming agent, stirring and standing to form a hardened blank, and carbonizing, activating, pickling and drying to obtain the three-dimensional graded porous carbon. The porous carbon material with the three-dimensional interconnected graded pore structure is prepared by adopting a carbonization-activation one-step method, the pore size and porosity of macropores can be regulated and controlled, the strength of a green body and a carbonized sample is effectively improved, the specific surface area of porous carbon is remarkably increased, the process is simpler, and the efficiency is higher.

The application discloses a low-permeability reservoir pore structure quantitative characterization method based on a nuclear magnetic resonance T2 spectrum multi-peak fitting, relates to the technical field of reservoir pore structure characterization, and comprises the following steps: preprocessing a nuclear magnetic resonance T2 spectrum, and decomposing the data after preprocessing by means of Gaussian multi-peak fitting; combining the peak area, the peak center and the peak width of each sub-peak to quantitatively characterize the porosity contribution and the pore size range of micro-pores, mesopores and macropores; introducing the sub-peak parameters obtained by multi-peak fitting into a permeability prediction model, correcting the model for predicting the permeability based on NMR T2 relaxation data based on the multi-peak fitting results, constructing a permeability model, and more accurately predicting the permeability, which has important significance for promoting reservoir prediction.

The application provides a one-dimensional high-entropy alloy, a preparation method and application of the one-dimensional high-entropy alloy in CO2 ring addition reaction, and relates to the technical field of high-entropy alloys.The molar ratio of iron salt, cobalt salt, nickel salt, manganese salt, chromium salt and cerium salt in the one-dimensional high-entropy alloy is 1:1:1:1:1:1;the high-entropy alloy has a fiber structure, the fiber has a hierarchical pore structure which is interconnected, including macropores or mesopores formed by decomposition of the self-sacrificing template 1, and mesopores or micropores formed by decomposition of the self-sacrificing template 2.Through improvement of the process conditions, the one-dimensional high-entropy alloy material with a unique structure can be prepared under relatively mild conditions, so that the whole reaction process is safer and more economical, and meets the goal of green chemistry and sustainable development.Meanwhile, the one-dimensional high-entropy alloy material prepared provides a large specific surface area, fully exposes active sites, and can realize efficient and stable conversion of the carbon dioxide ring addition reaction.

The invention belongs to the technical field of polyethersulfone, and particularly discloses a polyethersulfone microfiltration membrane with an integrally-formed double-layer structure and a preparation method of the polyethersulfone microfiltration membrane. The polyethersulfone microfiltration membrane is prepared from a single solution coating through an upper and lower layer dual induction process, and the cross section of the membrane is in a highly asymmetric form with a double-layer structure on the integrity; the upper layer is of a coarse-branch continuous macroporous structure and can accommodate more intercepted particles, so that the service life of the filter membrane is prolonged; the lower layer is of a fine branched continuous small hole structure, so that interception of particles can be ensured, and the filtering quality is improved; the upper layer and the lower layer are communicated in aperture, the structural cohesion is good, and no fracture phenomenon occurs; the thickness ratio of the upper layer to the lower layer is 2: (2.5-3.5); the preparation technology is simple and controllable in process, easy to implement, low in equipment requirement and suitable for batch production.

To achieve the object, provided is an adsorbent material including: a porous body having a co-continuous structure formed of a ceramic skeleton (1) including a mesopore (3) and a macropore (2); and a sulfur atom-containing group that modifies the surface of the ceramic skeleton, the amount of the sulfur atom-containing group included in the adsorbent material being 0.5 mmol / g or more and 3.5 mmol / g or less, and the water absorption rate of the adsorbent material being 8% or more.

The invention relates to a fly ash-based hierarchical pore molecular sieve composite material as well as a preparation method and application thereof, and belongs to the technical field of molecular sieve composite materials. In order to solve the problems that an existing fly ash based molecular sieve is single in pore structure, can only adsorb single pollutants and is complex in preparation process, the invention provides a preparation method of a fly ash based hierarchical pore molecular sieve composite material. The method comprises the following steps: carrying out mechanical-chemical coupling activation on fly ash, carrying out alkali fusion activation treatment, preparing a colloidal precursor, carrying out hydrothermal crystallization treatment, carrying out post-treatment on a crystallized product, and carrying out metal ion modification treatment. A micropore-mesopore-macropore three-level pore channel is constructed, the mass transfer efficiency and the adsorption activity are improved, double active sites are formed through metal modification, heavy metal and CO2 can be synchronously adsorbed, and the CO2 capacity is improved by 10-15% through heavy metal loading. The one-step method is adopted for preparation, the process is simplified, the cost is low, high consumption of fly ash is achieved, and the benefits of solid waste recycling and multi-pollutant cooperative treatment are achieved.

The application discloses a kind of hierarchical carbon source microspheres for denitrification filter and preparation method thereof, it is related to water treatment field, the preparation method includes the following steps: preparation includes biodegradable polymer, nanofiber and mesoporous template agent precursor solution, and pre-crosslinking is carried out, and resin matrix is obtained;Resin matrix is sprayed into high-temperature inert atmosphere by atomization, and the microsphere precursor a with macroporous structure is formed by solvent evaporation and reaction induced phase separation;Microsphere precursor a is placed in steam environment, and inorganic silicon source precursor is condensed on macroporous structure and in-situ sol-gel reaction occurs, forming a reinforcing layer, to obtain microsphere precursor b;Microsphere precursor b is sequentially subjected to CO2 extraction and post-processing, and the whole microsphere precursor b forms mesoporous and microporous, to obtain hierarchical carbon source microspheres.The application effectively solves the problems of unstable control of carbon source release rate and limited microbial deep colonization by constructing hierarchical pore structure with macroporous, mesoporous and microporous.

This invention relates to the field of catalysts, and discloses a catalyst support and its preparation method, as well as a catalyst and its application. The catalyst support contains Y-zeolite, β-zeolite, alumina, and optionally amorphous silica-alumina. The Y-zeolite comprises micropores with a pore size less than 2 nm, mesopores with a pore size of 2-50 nm, and macropores with a pore size greater than 50 nm. Taking the total volume of micropores, mesopores, and macropores as 100%, the micropore volume accounts for less than 40%, the mesopore volume accounts for 20-80%, and the macropore volume accounts for less than 40%.

The application discloses an alumina carrier with a core-shell structure and a preparation method thereof. The alumina carrier is a three-layer spherical structure of "eggshell-egg white-egg yolk", the "eggshell" layer is a flaky alumina grain aggregate, and the "egg white" and "egg yolk" layers are mixed phases of the flaky alumina grain aggregate and the granular alumina aggregate. The preparation method of the alumina carrier is as follows: (1) preparing flaky pseudo-boehmite P1; (2) mixing pseudo-boehmite P2 and P1 to obtain a mixture H1, and performing ball rolling forming to obtain a spherical precursor S1; (3) mixing P2 and P1 to obtain a mixture H2, and then mixing S1 and H2 to perform ball rolling forming to obtain a spherical precursor S2; and (4) mixing P1 and S2, performing ball rolling forming, and then drying and calcining to obtain the alumina carrier. The alumina carrier has a gradient distribution of macropore content and pore size in the "eggshell-egg white-egg yolk" structure, and the alumina carrier is suitable for a high-metal-content heavy residual oil hydroprocessing process.

The invention belongs to the technical field of metal ion separation, and discloses a functional COFs (Covalent Organic Frameworks) material for zirconium and hafnium separation as well as a preparation method and application of the functional COFs material. The material is prepared by taking an aromatic monomer containing a conjugated structure as a skeleton through aldehyde amine condensation, crosslinking, carbonization and functional loading, and has stable imine bond connection and a three-stage through hole structure consisting of macropores, mesopores and micropores. A phosphate group and a P507 / Cyanex 302 mixed extraction agent are introduced into the surface of the material through a pre-modification and post-loading strategy. The material shows high-selectivity adsorption on zirconium ions, the separation coefficient beta Zr / Hf is larger than or equal to 3.5, the adsorption speed is high, the stability is excellent in strong acid, high temperature and irradiation environments, and the material can be recycled. The invention also provides a mild and controllable preparation method of the material and a specific application of the material in a zirconium and hafnium column separation process, the material is particularly suitable for purification preparation of nuclear-grade zirconium and hafnium, and the problems of heavy organic pollution, low efficiency and poor material stability in the existing separation technology are solved.

The application provides a method and application for rapidly preparing hydroxyapatite material, and belongs to the field of inorganic material synthesis. The application uses a calcium source solution containing glacial acetic acid and a phosphorus source solution containing hydroxyapatite crystal seeds and sugar alcohol solid as raw materials, uses micro-channel continuous flow technology and optimizes reaction parameters to rapidly prepare a crude hydroxyapatite, and then uses a joule heat treatment rapid high-low temperature technology to rapidly prepare a microspherical hydroxyapatite material, so that the preparation time is greatly shortened. The particle size range, specific surface area and pore size range of the material are 528-1053 nm, 95.72-117.71 m 2 / g and 0.5-83 nm respectively, which indicates that the material is a multi-level pore structure of micron level, high specific surface area, micropore and mesopore and macropore, can realize adsorption of organic matter-containing wastewater, the removal rate is more than 97.5%, is 1.87 times of the removal capacity of hydroxyapatite material without joule heat treatment, is outstanding in the field of organic matter adsorption and has good industrialization prospect.

The invention belongs to the technical field of catalyst carriers, and particularly relates to an alumina carrier as well as a preparation method and application thereof. The specific surface area of the alumina carrier is 250m / g-470m / g, the pore volume of the alumina carrier is 1.0 mL / g-3. 3mL / g, the content of pores with the pore diameter larger than 100nm in the alumina carrier is larger than or equal to 15%, and the strength of the alumina carrier is larger than 5N / mm. The alumina carrier has the beneficial effects that the pore volume ratio of macropores of the alumina carrier reaches 15% or above, so that the in-particle diffusion limitation of the catalyst is effectively relieved, and the alumina carrier is particularly suitable for treating high-diffusion resistance systems such as macromolecules, heavy oil, asphaltene and coal tar; according to the present invention, the pore structure of the alumina carrier has strong adjustability, and by matching the type and the amount of the demulsifier with the auxiliary pore-enlarging agent, the 200-3500 nm macropore regulation can be flexibly achieved so as to meet different hydrogenation reaction requirements; the alumina carrier provided by the invention is high in mechanical strength, even though the pore volume is large and diffusion macropores are rich, the prepared alumina carrier still has the single grain strength of greater than or equal to 5N / mm, and meets the requirements of an industrial fixed bed hydrogenation device.

The present application aims to provide a gradient pore distribution alumina carrier and a preparation method thereof, and belongs to the technical field of alumina material synthesis. After calcination of pseudo-boehmite, the present application immerses the pseudo-boehmite into an organic alkali solution twice for hydrothermal treatment. During the hydrothermal treatment, the alumina grains are rehydrated and secondarily grown to form elliptical flaky pseudo-boehmite with a morphology. The elliptical flaky particles are stacked to form a large number of macropore channels. During the shaping of the carrier, the content of the elliptical flaky pseudo-boehmite in the mixture is adjusted to prepare the alumina carrier with gradient distribution of the channels. The alumina carrier has a high content of macropores in the shell layer, and the channels are wide. The pore structure is beneficial to the diffusion of macromolecular reactants to the inside of the carrier, and at the same time, the surface of the carrier has a strong anti-clogging ability.

The present invention provides a carbon material that exhibits excellent conductivity and superior rapid discharge characteristics, battery capacity characteristics, and charge / discharge characteristics when manufacturing electrodes for electrochemical elements. [Solution] The carbon material according to the present invention has a linear portion in which five or more hollow particles having a carbonaceous outer shell are connected in series along the longitudinal direction, and the base end of a branched structure that constitutes a separate path from the linear portion is connected to the intermediate portion between the first end hollow particle located at one end of the linear portion and the second end hollow particle located at the other end, and a part of the branched structure forms a ring shape, and the macropore volume is 0.1 cc / g or more.

The invention discloses a composite membrane with a PPy hollow microsphere stacking structure constructed through spraying and a preparation method of the composite membrane, and belongs to the technical field of nanofiltration membrane materials, the composite nanofiltration membrane is composed of a basement membrane, a hollow microsphere stacking layer and a polyamide selection layer, and the preparation method comprises the steps of basement membrane pretreatment, hollow microsphere accurate loading paving, interfacial polymerization and aftertreatment. Through accumulation of hollow microspheres, a unique hierarchical pore channel composite supporting structure is constructed below a polyamide separation layer, and a high-connectivity through macroporous channel formed by accumulation of the microspheres and a cavity low-resistance transmission path in the microspheres are combined; the hollow-accumulation structure greatly reduces the solid volume obstacle and tortuosity in the water molecule transmission process, fundamentally reduces the mass transfer resistance of the whole membrane, provides an ultra-fast transmission channel for water molecules, realizes the improvement of the water flux of the nanofiltration membrane, breaks through the performance bottleneck of the traditional nanofiltration membrane, and has a wide application prospect. And a more efficient solution is provided for applications such as high-salinity wastewater treatment and seawater desalination.

The invention discloses a transition metal carbon-nitrogen material with a hierarchical pore structure as well as a preparation method and application of the transition metal carbon-nitrogen material. Ordered macropores, mesopores and micropores exist in the structure of the transition metal carbon-nitrogen material, the specific surface area range is 600-1300m < 2 > / g, the average pore size is 5-50nm, and the pore volume is 1.0-5.0 cm < 3 > / g. According to the preparation method, a porous, especially mesoporous structure can be accurately constructed, the aperture and form of the material can be controlled, and the material has a high specific surface area, so that more catalytic active sites are exposed, the adsorption and selectivity of a reaction substrate are accurately regulated and controlled, and the potential advantage of improving the catalytic efficiency is achieved.

The invention discloses a directional cultivation method for a sulfur autotrophic nitrogen removal filter material with a multi-gradient pore structure. The directional cultivation method specifically comprises the following steps: step 1, preparing raw materials; step 2, gradient mixing; thirdly, layered pressure forming is conducted; 4, controllable ablation hole forming is carried out; step 5, surface modification treatment; step 6, performance detection and optimization; 7, filter material application and effect evaluation; the nitrate nitrogen diffusion coefficient is increased by 35% and the reaction kinetic constant (k) reaches 0.23 h <-1 > through a three-stage pore system; the Zeta potential (-25mV) on the surface of the micropore promotes the adhesion of bacteria, and the forming time of a biological membrane is shortened by 30%; the solid deposition rate is reduced through the large-hole channel spacing design, and the operation cycle is prolonged to two times of that of a traditional filter material.

This invention discloses an alumina support and its preparation method. The alumina support includes an alumina matrix and first sheet-like alumina particles grown in situ on the outer surface of the matrix. The alumina matrix includes granular alumina particles and second sheet-like alumina particles. The size of the first sheet-like alumina particles is 100~600nm, and the sheet-like particles on the surface are stacked to form pores of 40-300nm. The preparation method is as follows: (1) Mix γ-phase alumina powder with propylene oxide aqueous solution and perform hydrothermal treatment to obtain sheet-like boehmite HP1; (2) Mix the sheet-like boehmite HP1 and boehmite P2 from step (1) to form an alumina support precursor; (3) Place the alumina support precursor in propylene oxide solution for a second hydrothermal treatment, and the treated material is used to obtain the alumina support. This alumina support has a rich macroporous content and can be used in macromolecular catalytic reactions, especially suitable for the hydrotreating process of heavy residue oil.

The invention discloses high-porosity polyurethane foam and a preparation method and application thereof.The high-porosity polyurethane foam is provided with macropores with the pore diameter ranging from 500 micrometers to 2000 micrometers and micropores with the pore diameter ranging from 10 micrometers to 100 micrometers at the same time, the volume ratio of the macropores to the micropores is (10-50): 1, the overall porosity of the polyurethane foam is larger than 96%, and the expansion multiple is larger than 75. The high-porosity polyurethane foam is prepared in a mode of combining freezing polymerization and a soluble salt template, a multi-stage pore channel is constructed through the synergistic effect of salt dissolution and ice crystal growth, an original pore channel structure formed by low-temperature reaction is kept to the maximum extent through freeze drying, and the high-porosity polyurethane foam is prepared. Meanwhile, the glass transition temperature Tg of the polyurethane foam material is close to the body temperature through the design of a polyurethane molecular structure, and the polyurethane foam material has the characteristic that the body temperature can recover the memory shape and is suitable for being used as a biomedical device for minimally invasive embolism.