14results about How to "Well-developed pore structure" patented technology

The invention provides a natural photocatalyst with an ultrahigh specific surface area as well as a preparation method and application thereof, and belongs to the technical field of sewage treatment. The preparation method comprises the following steps: culturing algae in a heavy metal polluted water body, carrying out sectional pore expansion on the obtained algae rich in endogenous metals, mixing a primary carbonized product with an activator, carrying out chemical regulation and control treatment to obtain a carbonized product, and sequentially washing and drying the carbonized product to obtain the natural photocatalyst. A natural raw material rich in endogenous active substances and rich endogenous mineral components such as Fe, Ni, Mn, Zn or Ti are prepared by utilizing the excellent biological enrichment effect of seaweed on heavy metals in a water body, the graphitization level of the catalyst is improved in the pyrolysis process, formation of an edge defect structure is promoted, the electron transfer capacity is remarkably improved, and the catalytic activity of the catalyst is improved. The catalytic performance of the catalyst is obviously improved, a preliminary carbonization product can be obtained through sectional pore expansion, and a carbon layer structure is twisted or deformed in the chemical regulation process, so that pores are formed. The specific surface area of the prepared natural photocatalyst reaches up to 3360.28 m < 2 > / g, the removal effect on organic dye is remarkable, the removal rate reaches 90% or above, and the purposes of resource utilization of seaweed solid waste and environmental protection can be achieved.

The invention discloses a blast furnace flue gas dechlorinating agent prepared from red mud and a preparation method and application of the blast furnace flue gas dechlorinating agent, and belongs to the technical field of energy conservation and environmental protection. In the process, firstly, the red mud is calcined and ground into powder; and then adding silica sol and polyethylene glycol into the red mud powder, carrying out extrusion molding, and roasting to prepare the dechlorinating agent with certain strength. Compared with the conventional calcium oxide dechlorinating agent, the dechlorinating agent taking the red mud as the active component has the advantages of no pulverization, simple preparation process and low cost, and the red mud belongs to solid waste, so that the purpose of treating waste with waste can be realized when the dechlorinating agent is prepared from the red mud. The dechlorinating agent prepared by the method is used for removing hydrogen chloride in blast furnace gas, and has the characteristics of high removal rate, long penetration time and high chlorine capacity.

The invention provides a preparation method of sludge-based biochar for directionally enriching iron phosphate through synergistic modification of ferrous sulfate and sodium persulfate, and belongs to the technical field of harmless treatment and resource utilization of municipal sludge and environmental functional materials. According to the method disclosed by the invention, active phosphorus in the sludge is converted into a stable iron phosphorus compound in advance through oxidation-complexation dual effects of the ferrous sulfate heptahydrate and the sodium persulfate; the phosphorus-rich sludge is converted into more stable phosphorus-rich biochar through two-step heat treatment, the whole process of sludge pyrolysis is cooperatively regulated and controlled through Fe < 2 + > / S2O8 < 2->, integration of phosphorus release, phosphorus fixation and heavy metal passivation is achieved, the problem that in the prior art, the phosphorus retention rate is low is solved, phosphorus resources in the phosphorus-rich sludge are extremely retained and stabilized, and the phosphorus-rich sludge is obtained. The fixed rate of phosphorus in the modified sludge-based biochar with directionally enriched iron phosphate prepared by the method is greater than 99%.

The invention relates to a composite material catalysis technology, and aims to provide a preparation method of a diatomite composite catalytic material. The method comprises the steps that diatomite is subjected to acid leaching modification treatment and then used for a hydrothermal reaction to achieve loading of precious metal active components, and a reaction system comprises a precious metal nitrate aqueous solution, modified diatomite and a proper amount of distilled water; and carrying out suction filtration, washing and drying on the reaction product, and calcining by using an ink method or a Joule thermal method to obtain carbon paper capable of being used as an electrode, and loading the diatomite composite catalytic material on the carbon paper. The diatomite composite catalyst used in the invention can effectively realize electrocatalytic reduction from carbon dioxide to carbon monoxide, and has good conversion efficiency and carbon monoxide yield; the composite catalyst has a developed pore structure and a relatively large specific surface and is beneficial to capture and diffusion of carbon dioxide, the rough carrier surface is beneficial to uniform dispersion of loaded noble metal, nano-scale growth of metal components is realized, and reaction quality transmission and catalytic activity are comprehensively improved.

This invention relates to a phenolic resin-based porous carbon and its preparation method, comprising reacting a pore-forming agent with formaldehyde to generate an active intermediate, then polymerizing it with phenol to obtain a porous carbon precursor; subsequently, carbonization, activation treatment, acid solution treatment, washing, and drying are performed; the pore-forming agent is a first pore-forming agent and / or a second pore-forming agent, wherein the first pore-forming agent is selected from one or more of acrylamide polymers, water-soluble acrylate polymers, vinylpyrrolidone polymers, polyacrylates, and alginates; and the second pore-forming agent is selected from one or more of vinyl alcohol polymers, polyethers, and water-soluble aliphatic polyamide polymers. By directly introducing the pore-forming agent as a reactive component into the synthesis process of phenolic resin, allowing it to participate in the construction of molecular chain segments, molecular-level dispersion and covalent fixation of the pore-forming component in the resin matrix are achieved, which helps to form a more developed, interconnected, and uniform pore structure, thereby improving the overall performance of the carbon material.

This invention relates to the technical field of solid waste resource utilization and environmental pollution control, and particularly to a method for co-preparing a biochar-steel slag composite adsorbent using steel slag and biomass. First, the raw steel slag is pretreated by coarse grinding, then mechanically activated and modified by high-energy ball milling to obtain finely ground steel slag powder. Next, the finely ground steel slag powder is mixed with a sodium bicarbonate solution and subjected to ultrasonic treatment in a water bath. Then, biochar bran is added in a specific ratio, and further ultrasonic treatment is performed for chemical composite modification. Finally, after solid-liquid separation, washing, and drying, a biochar-steel slag composite structure adsorbent is obtained. This invention, through a combined mechanical and chemical technique, significantly increases the specific surface area of ​​the material, exposes the internal active components, constructs a composite structure, and enriches the surface active functional groups, exhibiting excellent adsorption performance and rapid adsorption kinetics for heavy metal ions in wastewater.

The invention provides a graphene oxide separation membrane with a multilevel structure as well as a preparation method and application of the graphene oxide separation membrane. The preparation method comprises the following steps: step 1, preparing a large graphene oxide dispersion liquid and a small graphene oxide dispersion liquid; step 2, carrying out hydrothermal reflux treatment on the large graphene oxide dispersion liquid; 3, sequentially loading the treated large graphene oxide and small graphene oxide on a hydrophilic ultrafiltration membrane or an ultrafiltration membrane subjected to hydrophilization treatment to obtain a composite membrane; and 4, carrying out plasma treatment on the composite membrane obtained in the step 3, and carrying out third spraying on the composite membrane to load small pieces of graphene oxide so as to obtain the graphene oxide separation membrane with the multilevel structure. The preparation method provided by the invention solves the problem of mutual restriction of separation performance and permeability of the graphene oxide membrane, so that the composite membrane has the advantages of good permeability, developed pore structure, small volume density, large specific surface area and pore volume and the like.

The invention discloses a preparation method of a heat insulation layer for heat insulation of a display module lamp drive, a heat insulation PCB substrate and a heat insulation COB module, and belongs to the technical field of display module heat insulation. Gamma-aminopropyltriethoxysilane is used as a coupling agent, fumed silica is subjected to ultrasonic dispersion treatment in an ethanol solution of the gamma-aminopropyltriethoxysilane, the pretreated fumed silica is mixed with a binder and an additive according to a certain proportion to form a heat insulation material, and then a heat insulation layer is formed on the surface of a base plate; the heat insulation PCB substrate and the heat insulation COB module are provided with the heat insulation layer; by optimizing the preparation process of the heat insulation layer and the combination mode of the heat insulation layer and the display module, high-precision installation and a good sealing effect of the heat insulation layer are achieved, and the heat insulation effect is further enhanced.

The application discloses an NH2-COFS@ZnS photocatalytic material and a preparation method and application thereof. A multi-amino aromatic ligand and a multi-aldehyde aromatic ligand are combined into an NH2-COFS material through a Schiff base reaction, and the NH2-COFS material is combined with a zinc salt and a sulfur source through a hydrothermal reaction to obtain an NH2-COFS@Zn photocatalytic material. The NH2-COFS@ZnS photocatalytic material has excellent photocatalytic activity, good structural stability and reusability, can be applied to photocatalytic reduction of CO2, and has the advantages of simple preparation method, low cost and meeting industrial production.

The invention discloses a porous carbon material and a template-free preparation method thereof. The specific surface area of the porous carbon material is not less than 500 m < 2 > / g, and the total content of pyrrole nitrogen and pyridine nitrogen accounts for not less than 85% of the total nitrogen element; the method comprises the following steps: dissolving carboxylated chitosan and glucosamine hydrochloride in water to obtain a mixed solution; carrying out hydrothermal reaction on the mixed solution to form a hydrogel precursor with a gap structure; and drying the precursor, and carrying out carbonization treatment in an inert atmosphere to finally obtain the porous carbon material rich in pyrrole nitrogen and pyridine nitrogen. The method does not need to use any template agent and etching agent, and is simple in process, low in cost, green, environment-friendly and easy for large-scale production. The porous carbon material prepared by the invention has high specific surface area and high content of electrochemical active nitrogen species, and the lithium ion battery silicon-carbon negative electrode material prepared by taking the porous carbon material as a substrate shows excellent electrochemical performance.

The application relates to the technical field of explosion suppression agents, in particular to a novel inorganic porous explosion suppression material and a preparation method thereof. The steps comprise the following: placing dried molecular sieves in a metal salt solution with the same volume as the water absorption amount of the molecular sieves, placing the molecular sieves in a constant-temperature oscillator for impregnation, then drying the molecular sieves in a blast drying oven for 12 hours, and then placing the molecular sieves in a muffle furnace for calcination for 5 hours, so that the molecular sieve powder modified by different metal ions is prepared. The prepared inorganic porous explosion suppression material has the advantages of being economic and efficient, low in cost, non-toxic and harmless, and applicable to industrial production, and can be applied to the field of methane explosion suppression.

The invention discloses a synthesis method of an antioxidant 44PD, and belongs to the technical field of chemical synthesis. The method comprises the following steps: placing p-nitroaniline, butanone and a catalyst in a dry reaction kettle, sealing the reaction kettle, replacing the reaction kettle with nitrogen and hydrogen in turn, introducing hydrogen to pressurize the reaction kettle, and heating the reaction kettle to obtain the antioxidant 44PD. The catalyst uses activated carbon as a carrier to load three metal active components, namely platinum, nickel and copper. The catalyst is used in combination to optimize the catalytic performance. The platinum, nickel and copper form a solid solution, which can limit the shedding of copper and avoid the occurrence of "copper damage" that has an adverse effect on the antioxidant performance and gasoline rubber. The synergistic effect between nickel and platinum atoms can change the electronic environment and the d-band center position of the platinum atoms, thereby increasing the oxidation potential of the platinum and restricting the agglomeration and shedding of the platinum, which is beneficial to the catalysis, repeated use and recovery of the platinum.

The invention relates to a carrier technology of an inorganic catalyst, and aims to provide a preparation method of a metal-diatomite carrier applied to electro-catalytic water decomposition. The method comprises the following steps: diatomite sieving and acid leaching treatment; putting the acid-leached diatomite into deionized water, and carrying out ultrasonic dispersion treatment to obtain a diatomite turbid solution; adding a metal acetate solution, mixing, and carrying out ultrasonic and stirring treatment; and transferring the mixture into a hydrothermal kettle for hydrothermal reaction, filtering after the reaction is finished, and cleaning the solid to obtain the metal-diatomite used as the carrier. The diatomite carrier prepared by the invention has a developed pore structure and a large specific surface area, and is beneficial to uniform dispersion of a catalyst and exposure of more active sites, so that the catalytic activity is improved; the carrier can be used as a part of raw materials for loading a catalyst, or can be directly used as a catalyst to be applied to electro-catalytic water decomposition; when the material is applied to HER / OER, the overpotential is low, the Tafel slope is small, the conversion frequency is high, and the stability is good.

This invention discloses a method for producing porous biomass carbon using Casuarina equisetifolia. The method involves reactively extruding Casuarina equisetifolia powder, ammonium polyphosphate, melamine, potassium acetate, urea, and water using a twin-screw extruder to obtain a rheological phase plasticizing precursor. This precursor is then refined through segmented curing and foaming, high-temperature reforming activation, hot water digestion, and ultrasonic acid washing to obtain porous biomass carbon. This invention utilizes a eutectic system to achieve low-temperature continuous processing of the precursor and inhibits equipment corrosion. A well-developed pore structure is constructed through a stepwise cross-linking foaming and mild activation strategy. The porous biomass carbon prepared by this invention has an ash content ≤1.12%, a carbon yield ≥35.7%, an iodine adsorption value ≥1278 mg / g, and a methylene blue adsorption value ≥175 mg / g. Furthermore, the process is continuous, with minimal equipment corrosion, making it suitable for industrial production.