62results about How to "Improve pore structure" patented technology

A method for preparing a capacitive deionization anode for phosphate adsorption and desorption, and its application, belong to the field of inorganic phosphorus wastewater adsorption and enrichment. This invention aims to solve the problems of existing adsorption materials, such as low phosphate adsorption capacity, difficulty in reusing the adsorbent, or poor conductivity. Method: 1. Preparation of a PEDOT / YMOF-NH2 composite material; 2. Preparation of a capacitive deionization anode. Application: It is used for the adsorption and desorption of phosphates in phosphate-containing water. This invention is used for the preparation of a capacitive deionization anode for phosphate adsorption and desorption.

The invention discloses a preparation method and application of a porous para-aramid nanofiber membrane. The preparation method of the para-aramid nanofiber membrane comprises the following steps: placing a substrate coated with an aramid nanofiber solution in an aprotic solvent to obtain an aramid nanofiber membrane containing the aprotic solvent; and immersing the aramid nanofiber membrane containing the aprotic solvent into a protic solvent, replacing the aprotic solvent in the nanofiber membrane with the protic solvent, and heating and drying to obtain the para-aramid nanofiber membrane. The para-aramid nanofiber membrane prepared by the preparation method of the para-aramid nanofiber membrane has highly adjustable porosity and pore structure, and has a huge application prospect in the fields of battery diaphragm and membrane separation and the like, and the preparation method is simple and suitable for large-scale industrial application.

The invention belongs to the technical field of fertilizers and relates to a compound fertilizer for black beans as well as a preparation method and application thereof. The compound fertilizer comprises a basic fertilizer, a microbial fertilizer and a trace element fertilizer, and a preparation method of the microbial fertilizer comprises the following steps: treating lignite with sophorolipid and trehalose lipid, treating turf with surfactin, mixing the treated lignite and turf, and then inoculating bacillus subtilis and rhizobium to obtain the microbial fertilizer. Through a unique dual mechanism of carrier synergism and fungicide function complementation, the dry matter cumulant and nitrogen cumulant of the overground part of the black bean are remarkably increased, and finally the yield and quality are remarkably improved.

The application discloses a preparation method of an iron-based catalyst, the iron-based catalyst and application of the iron-based catalyst. The preparation method mainly comprises three steps: firstly, a mixed solution of an iron-based precursor and an organic template agent with uniform distribution is prepared by means of stable temperature and autogenous pressure in a solvothermal process; subsequently, a weak alkaline precipitant without alkali metal is added into the mixed solution under heating to prepare an iron-based precipitate; finally, a honeycomb-shaped iron-based catalyst for ortho-para hydrogen conversion is prepared through steps of cleaning, drying, calcining, granulating, re-cleaning and activation. By adding the organic template agent, the pore structure of the catalyst is effectively improved without affecting the crystal type of the catalyst, and the performance of the catalyst is improved; and the weak alkaline precipitant without alkali metal is adopted, so that the controllability of the preparation process of the catalyst is enhanced, the influence of impurities such as alkali metal ions on the performance of the catalyst is effectively avoided, and the method has a simple process and high practical potential.

The invention discloses a rare earth tailing-based aerogel catalyst for refractory coal and a preparation method thereof, and the preparation method comprises the following steps: a, pretreating rare earth tailings rich in cerium oxide to obtain raw material powder; b, carrying out modification treatment on the raw material powder obtained in the step a to obtain modified powder; and c, preparing rare earth tailing-based aerogel from the modified powder obtained in the step b, and grinding to obtain the catalyst. The rare earth tailing-based aerogel catalyst prepared by the invention has a relatively high specific surface area and a rich pore structure, obviously improves the combustion efficiency of fire coal, can be suitable for fire-retardant solid fuel, realizes wide-load stable combustion of fire-retardant coal powder, expands the coal type adaptability of a unit, reduces the use amount of long flame coal, and reduces the production cost. The coking problem is effectively solved.

The invention discloses multi-adsorption-site nitrogen-doped porous carbon, a preparation method and application in iodine adsorption, and the preparation method comprises the following steps: carrying out primary calcination on a zeolite imidazate framework material, mixing with potassium hydroxide, and then carrying out secondary calcination to obtain the multi-adsorption-site nitrogen-doped porous carbon. According to the invention, a zeolite imidazate framework material is used as a precursor, potassium hydroxide is introduced for high-temperature calcination activation treatment, the obtained product inherits a rhombic dodecahedron framework of ZIF-8, a continuous through pore system and a nitrogen-doped carbon material with high pyrrole nitrogen content are formed, and the static adsorption capacity of the nitrogen-doped carbon material to iodine can reach 7.99 g / g.

This invention discloses a USY molecular sieve, its preparation, and its application. The USY molecular sieve has the following properties: mesoporous pore volume accounts for 30%–60% of the total pore volume; the total acid content is 400–480 μmol / g at 200℃ and 120–150 μmol / g at 350℃. When the molecular sieve of this invention is used as a hydrocracking catalyst, both the catalyst activity and selectivity are significantly improved.

This invention focuses on the application of a PtZn / Al2O3 bimetallic catalyst in the propane dehydrogenation reaction. A uniquely structured mixed oxide support was synthesized through a co-precipitation strategy incorporating an appropriate amount of silicon (Si), and metallic Pt was loaded using an equal-volume impregnation method. Benefiting from the uniform dispersion of Zn, Pt is atomically dispersed on the surface of Zn nanoclusters, improving metal utilization and catalytic efficiency. The introduction of Si significantly optimizes the metal-support interaction, greatly enhancing the catalyst's activity and stability. With catalyst particles of 20-40 mesh, it exhibits excellent catalytic performance, along with good high-temperature stability and resistance to carbon deposition. This preparation process is simple, reproducible, and achieves efficient and highly selective propylene production with low amounts of precious metals, demonstrating promising industrial application prospects.

This invention discloses a silicon-carbon composite anode material, its preparation method, and its applications. The preparation method includes: preparing a nitrogen-doped porous carbon framework from a carbon source, a nitrogen source, a pore-forming agent, and a soft template agent; surface-modifying the nitrogen-doped porous carbon framework with a silane coupling agent; subjecting the surface-modified nitrogen-doped porous carbon framework to chemical vapor deposition to obtain a silicon-carbon composite intermediate; and carbon-coating the silicon-carbon composite intermediate to form the silicon-carbon composite anode material. This invention improves the interfacial bonding strength between silicon and the carbon framework through chemical anchoring, and provides sufficient buffer space for silicon volume expansion through the synergistic pore-forming effect of the pore-forming agent and the soft template agent, thereby improving cycle stability. All steps are conventional chemical unit operations, and the raw materials used are all industrial-grade chemicals. The equipment requirements are low, and it is easy to scale up production.

The application discloses a kind of super-light inorganic high-efficiency thermal insulation materials and preparation method thereof.The super-light inorganic high-efficiency thermal insulation material of the application is mainly prepared by the following components by pressure foaming-decompression foaming process according to weight parts: light-burned magnesium oxide 28-37 parts, magnesium sulfate heptahydrate 18-26 parts, compound foaming agent 0.8-1.5 parts, compound foam stabilizer 0.08-0.12 parts, water reducing agent 0.1-0.3 parts, and water 45-58 parts.The application prepares inorganic high-efficiency thermal insulation material by pressure foaming-decompression foaming process.Under pressure conditions, a large number of stable and uniform bubbles are introduced into the inorganic thermal insulation material, then a large number of uniform and stable pressurized bubbles are mixed uniformly with cement slurry to obtain foamed slurry.In the process of pressure relief, the bubbles inside the pressurized foamed slurry expand uniformly, achieving super-light design.The bulk density of the prepared super-light inorganic high-efficiency thermal insulation material can reach 41-60 kg / m 3 , the strength is greater than or equal to 10 kPa, and the thermal conductivity can reach 0.029-0.035 W / (m·k).

The application discloses a continuous production equipment and method of e-PTFE bidirectional stretching tubular membrane, belongs to the technical field of filter membranes, and comprises a control system, a conveying device, an extruder, a degreasing stretching box, a traction machine, a fixed jacket, a jacket assembly device, a radial stretching core rod, a core rod assembly device, a high-temperature stretching box, a core rod dismounting device and a jacket dismounting device; the continuous production equipment of the e-PTFE bidirectional stretching tubular membrane is high in automation, can realize twice axial stretching and once radial stretching of a tubular body in combination with a specific method, and prepares the e-PTFE bidirectional stretching tubular membrane which is more uniform in three-dimensional fluffy membrane hole, node and fiber distribution, higher in porosity and better in interception effect.

The invention relates to the technical field of conjugated microporous polymer materials, and discloses a covalent triazine unit-based conjugated microporous polymer membrane with negative charges and a preparation method thereof. The method comprises the following steps: firstly, preparing a negatively charged cyanophenyl monomer through nucleophilic substitution reaction of a cyanophenyl-containing compound and 1, 4-butane sultone, then taking the monomer and biphenyl nitrile as comonomers, and carrying out step-by-step polymerization, heating film formation, shock cooling shaping and dual-solvent soaking post-treatment under the catalysis of trifluoromethanesulfonic acid to obtain the cyanophenyl-containing polymer film. And finally obtaining the covalent triazine unit-based conjugated microporous polymer membrane with negative charges. The preparation process is high in controllability, and the obtained film has high stability of a covalent triazine structure and the porous characteristic and negative charge function of conjugated micropores, and has wide application prospects in the fields of gas separation and the like through verification.

This invention belongs to the field of ecological restoration and soil moisture regulation in arid areas, and relates to a biomass-based porous carbon material, its preparation method, and its application. The preparation method of the biomass-based porous carbon material includes the following steps: S1: Pre-treating crushed herbaceous fiber plant stem biomass to obtain pre-treated biomass. S2: Dehydrating the pre-treated biomass to obtain dehydrated biomass. S3: Carbonizing the dehydrated biomass to obtain a porous carbon skeleton. S4: Activating the porous carbon skeleton in a calcium hydroxide solution to obtain a porous carbon material with micropores, mesopores, and macropores. This invention, through the synergistic effect of four core steps—pre-treatment, dehydration, carbonization, and activation—constructs a multi-level interconnected pore structure composed of micropores, mesopores, and flow-conducting macropores while maintaining the natural fibrous vascular structure of herbaceous biomass. The specific surface area is increased by 600-800% compared to carbonized materials alone, while maintaining a water absorption rate of 150-300%.

This invention relates to the field of wastewater treatment technology, specifically to a process and system for removing heavy metals from ink wastewater. It includes the following steps: coagulating ink wastewater with a metal composite coagulant, adsorbing and removing sludge wastewater with an ink sludge-based adsorbent, and filtering wastewater using a catechol-modified polyethersulfone membrane, followed by detection. This invention utilizes high-iron copper slag with titanium tetrachloride and acetylacetone to prepare a metal composite coagulant, transforming the copper slag into a high-value-added water treatment agent. This significantly reduces the production cost of the coagulant. Through the synergistic leaching of dilute sulfuric acid and hydrogen peroxide, the iron element in the copper slag is efficiently extracted and oxidized into Fe, which has a strong coagulation effect. 3+ The trace amounts of copper and other metal ions dissolved also provide a basis for subsequent composite reactions, thus improving the overall treatment efficiency and effluent quality of oily sludge wastewater.

The application provides a high-capacity and high-rate hard carbon negative electrode material and a preparation method and application thereof, and belongs to the technical field of sodium ion battery negative electrode materials. Specifically, biomass shell raw materials are coarsely broken and sieved to obtain biomass coarse powder; the biomass coarse powder is mixed with an oxidizing agent and then pre-oxidized; mechanical pulverization is performed to obtain biomass coarse powder with a D50 of 8-15 microns; the biomass coarse powder is added into mixed acid and heated in a water bath, and then washed with water until neutral to obtain a purified precursor; and finally, the precursor is subjected to staged high-temperature carbonization in a vacuum carbonization furnace. Through specific process parameters, the prepared hard carbon material has a hierarchical porous structure and a suitable graphite microcrystalline layer spacing, and has a low total content of metal impurities; when applied to a sodium ion battery negative electrode, the hard carbon material exhibits a high reversible specific capacity, a high initial coulombic efficiency, and excellent long cycle stability and rate performance.

This invention relates to the field of water treatment technology, specifically to a method for adsorbing heavy metals in copper-containing wastewater. The method includes: preparing a modified chitosan composite material; preparing a composite fiber filter membrane; preparing composite hydrogel microspheres; and treating the copper-containing wastewater. This invention first dissolves chitosan and mixes it with nano-ferric oxide to form a physical coating, imparting magnetic responsiveness to the chitosan. Then, it modifies the chitosan using 1,3,5-phenyltricarboxylic acid and triethylenetetramine. A three-dimensional network cross-linked structure is constructed by reacting glutaraldehyde with the amino groups of chitosan and triethylenetetramine to produce modified chitosan. Finally, graphene oxide is loaded onto the surface and pores of the modified chitosan through impregnation and drying to obtain a modified chitosan composite material. When this material is added to pretreated wastewater, it can significantly improve the adsorption capacity for copper ions in copper-containing wastewater.

The utility model belongs to the technical field of refractory metal preparation, and particularly relates to a device for preparing refractory metal powder through layered reduction, which comprises a reactor, a heater and a tray, diluted salt and a reducing agent are laid in the reactor, refractory metal oxide raw materials are contained in the tray, and the tray can be submerged in the reducing agent or the diluted salt in a lifting mode. The top of the reactor is connected to vacuum equipment through a vacuumizing pipe; a gas inlet and a gas outlet which are used for introducing inert gas into the reactor and discharging inert gas from the reactor are also formed in the top of the reactor. The device also provides a new preparation mode for tantalum powder, reduction is carried out for a certain time in the upper magnesium melt, the influence of diluted salt in the reduction process is eliminated, and the product structure is not damaged; and then entering a lower layer diluted salt molten salt system, and preserving heat for a period of time, so that the surface activity of tantalum powder particles can be improved, the impurity content is reduced, the growth and sintering of small particles are promoted, and the particle uniformity and pore structure are improved.

The invention relates to the technical field of electrochemical materials, in particular to a pre-sodium hard carbon material and a preparation method and application thereof. The pre-sodium modification method for preparing the pre-sodium modification hard carbon material comprises the following steps: (1) mixing a carbon source, amino acid and phosphoric acid, and carrying out pre-carbonization reaction to obtain a doped carbon source; (2) providing dispersion liquid containing the doped carbon source, a surfactant and weak base, and introducing organic sodium salt to carry out sodium pre-modification reaction to obtain a hard carbon precursor; and (3) carrying out carbonization reaction on the hard carbon precursor to obtain the pre-sodium hard carbon material. The pre-sodium treatment method is simple to operate and high in safety, the obtained pre-sodium treatment hard carbon material is excellent in performance, and the problems that a sodium ion battery is low in energy density and poor in cycle performance can be effectively solved.

The invention discloses a catalyst for treating industrial organic waste gas, which is characterized in that one or more than two of Fe, Ni, Co, Cu, Zn, Mn, Ce and Nb are combined to prepare a catalyst activating solution, the distribution of active metals on the surface of the catalyst is effectively regulated and controlled, and the pH is regulated and controlled by ion substances containing Na < + >, K < + > and NH4 < + >, so that the pore structure of the catalyst is effectively improved in the roasting process, the nitrogen content of the catalyst is increased, and the catalyst has high catalytic activity. The catalyst activity is effectively improved, and the requirements of facilities for treating waste gases such as CO and RCO can be met.

The invention relates to the technical field of organic solid waste treatment, and discloses a bio-based catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, drying and crushing the landscaping waste to obtain a reactant I; s2, dehydrating the sludge anaerobic digestion biogas residues to obtain a reactant II; s3, mixing the reactant I and the reactant II, and uniformly stirring to obtain a mixture; and S4, mixing the mixture with urea, and then carrying out pyrolytic reaction under the protection of inert gas, thereby obtaining the product. The process is easy to operate, raw materials are easy to obtain, and regeneration can be achieved in a simple and low-consumption treatment mode; the bio-based catalyst can effectively activate persulfate so as to degrade bisphenol A, tetracycline, dicamba, antibiotic resistance genes and other pollutants, the purposes of synergistic interaction, pollution reduction and carbon reduction of urban carbon-rich organic solid waste are achieved, and the dual purposes of treating waste with waste and recycling waste are achieved.

The invention provides a platinum-bismuth alloy catalyst, a preparation method thereof and a direct methanol fuel cell, and belongs to the technical field of electrochemical catalysts. The method comprises the following steps: mixing carbon black with an acidic aqueous solution, and sequentially carrying out acidizing treatment and roasting treatment to obtain pretreated carbon black; mixing the pretreated carbon black, Bi2O2CO3, a platinum source, a precipitant, a pH regulator, a first dispersing agent and first water, and performing replacement reaction to obtain a suspension; mixing a reducing agent, a second dispersing agent and second water to obtain a mixed solution; dropwise adding the suspension into the mixed solution for reduction reaction to obtain a catalyst precursor; and calcining the catalyst precursor under first protective gas to obtain the platinum-bismuth alloy catalyst. The prepared platinum-bismuth alloy catalyst has excellent electro-catalytic performance, shows relatively high catalytic activity and cycling stability, and can be applied to oxygen reduction reaction of a cathode of a direct methanol fuel cell.

The application discloses a kind of basic sulphate load Pt composite material and its preparation method and application in seawater electrocatalytic hydrogen evolution, belong to the preparation technical field of electrocatalytic material.The application is to solve the technical problems of low catalytic activity of existing catalyst, and high cost of noble metal.Method includes:1) preparation basic nickel sulfate carrier;2) preparation Pt source solution;3) soaking;4) electrochemical treatment obtains basic sulphate load Pt composite material.The basic sulphate load Pt composite electrode material prepared by the application shows superior catalytic performance in alkaline conditions and seawater electrocatalytic hydrogen evolution, has excellent electrochemical performance and stability, and will have wide application prospect in the field of electrocatalytic water decomposition electrode material technology.The basic sulphate load Pt composite material electrolytic water catalyst prepared by the method of the application is used in the field of electrocatalytic material technology, and improves hydrogen energy preparation and seawater utilization problem.

The invention relates to the technical field of carbon material preparation and modification, in particular to a preparation method of conductive carbon black with high specific surface area. The preparation method provided by the invention comprises the following steps: under a protective atmosphere, heating a raw material carbon black to 350-550 DEG C for first heat treatment, then heating to 800-950 DEG C for second heat treatment, and continuously heating to 1300-1600 DEG C for third heat treatment to obtain intermediate carbon black; sequentially carrying out water vapor activation and carbon dioxide activation on the intermediate carbon black to obtain the conductive carbon black with high specific surface area, the temperature of water vapor activation is 850 to 950 DEG C; the activation temperature of the carbon dioxide is 900 to 1000 DEG C. Impurities are removed through gradient heat treatment, a carbon skeleton is rearranged, and then water vapor and CO2 physical activation are utilized to cooperatively regulate and control micropore and mesoporous structures, so that the high specific surface area and the high conductivity are taken into account.

This invention provides a slope protection material composed of recycled heavy metal tailings and its preparation method. The material includes: recycled heavy metal tailings treated with a heavy metal chelating agent as a heavy metal ion capture agent, the chelating agent being added at 0.05%–0.2% of the heavy metal tailings weight; recycled heavy metal tailings as aggregate, which is mixed with natural soil to form a base material at a ratio of 1:1.5–2.5; fine aggregate and fine sand, added at 5%–10% of the base material weight; and high-viscosity industrial-grade sodium alginate added as a water-retaining and reinforcing agent, added at 0.5%–2.0% of the base material weight. Additionally, 28% organic matter is added to the base material. The application of this invention effectively solves the problems of ineffective utilization of recycled heavy metal tailings and excessive use of scarce natural soil in existing technologies, and also addresses the issues of weak strength, poor effectiveness in steep slope treatment, and poor stability in existing slope protection materials.

The invention discloses a preparation method of a macroporous magnesium-aluminum composite material, and belongs to the technical field of chemical engineering, and the method comprises the following steps: preparation of magnesium-aluminum sol, preparation of a first solution, preparation of a magnesium-aluminum dry gel film, preparation of a macroporous magnesium-aluminum composite material precursor and preparation of the macroporous magnesium-aluminum composite material. According to the invention, the alumina matrix is subjected to magnesium-aluminum coating modification, the pore structure of the magnesium-aluminum composite material is optimized, the surface acid-base property of the adsorbent material is improved by combining the modification of the organic ligand, and the adsorption selectivity of water vapor is greatly reduced while the structural stability of the material is ensured; the carbon dioxide can be efficiently captured in a high-water-vapor environment (such as air). The invention also discloses the macroporous magnesium-aluminum composite material prepared by the preparation method. Meanwhile, the invention further discloses application of the macroporous magnesium-aluminum composite material in the field of adsorption.

The invention belongs to the technical field of building materials, and particularly relates to a preparation method of a filter-press mud cake as a flow-state filling material. The method comprises the following steps: adding basalt fibers into gamma-aminopropyltriethoxysilane to obtain basalt fibers subjected to surface treatment, and stirring and mixing the basalt fibers subjected to surface treatment with a modified siliceous material to obtain a fiber reinforced material; stirring 70-80 parts of the filter pressing mud cake, 3-6 parts of a curing agent and 3-5 parts of a fiber reinforced material, then adding 2-4 parts of an early strength agent, 8-12 parts of recycled fine aggregate and 0.1-0.2 part of an air entraining agent, and stirring to obtain the flow state filling material. The material obtained in the invention has good mechanical properties, durability and contractibility.

The present application relates to cement-based building material technical field, especially to a kind of enhanced recycled aggregate concrete and preparation method thereof, the raw material of SAP particle is adjusted from the synthesis angle first in the present application, the surface group and pore structure of SAP particle are regulated, then the loading of nanometer silicon dioxide is carried out, and the enhanced SAP is prepared after silane coupling agent treatment, which has internal curing and hydration enhancement effect, and can be targeted to reinforce recycled aggregate concrete.

The invention provides an alkali-activated slag cementing material and a preparation method thereof. According to the preparation method of the alkali-activated slag cementing material, nanocellulose (CNF) is introduced into an alkali-activated metakaolin cementing material, and microcrack propagation caused by stress concentration can be inhibited, so that the compressive strength and toughness of the material are improved; the C-S-H seed crystal can be used as a hydration product nucleation site to accelerate the hydration reaction process and promote the uniform growth of the compact C-S-H gel, so that the pore structure is optimized and the strength is improved. And the CNF and the C-S-H seed crystal have complementarity in the aspect of enhancing a modification mechanism. The CNF can improve the toughness through the physical bridging effect of nanofibers, and the C-S-H seed crystal can optimize the compactness by chemically regulating and controlling the hydration process, so that the alkali-activated slag cementing material is reinforced and modified.

The invention provides pseudo-boehmite as well as a preparation method and application thereof.According to the pseudo-boehmite, on the basis of a neutralization method, magnesium salt is introduced into a wet filter cake of the pseudo-boehmite, key parameters such as pH in all steps are controlled, the pseudo-boehmite containing a magnesium aluminate spinel structure is finally prepared, the final product is stable in quality, and the yield is high. And the catalyst has high hydrothermal stability.

This invention discloses a phosphorus slag-based cementitious material, its preparation method, and its application, specifically relating to the field of cementitious materials technology. The cementitious material, by weight, comprises the following components: 60-90 parts phosphorus slag powder; 5-25 parts fly ash; 5-15 parts activator; 0.25-1.5 parts early-strength agent; and 0.2-0.5 parts water-reducing agent; wherein the specific surface area of ​​the phosphorus slag powder is 400-550 m². 2 / kg, particle size (D) 90 The particle size is 20-40 μm; the early-strength agent is selected from at least one of iron salts and aluminum salts. This invention uses phosphorus slag micro-powder with a specific specific surface area as the main substrate, with a high dosage, combined with fly ash, activator, early-strength agent, and water-reducing agent to obtain phosphorus slag-based cementitious materials. By optimizing the physical properties of the phosphorus slag micro-powder and constructing a suitable composite activator-early-strength system, the 28-day compressive strength of the cementitious material reaches over 61.0 MPa, achieving a balance between "high phosphorus slag content" and "high strength".