27results about How to "Increase the active site" patented technology

The invention relates to a defect-rich cobalt-doped MoS2 / NiSe2 heterojunction nano array electrode as well as a preparation method and application thereof, and belongs to the field of electro-catalysis and new energy materials. The electrode is composed of a self-supporting MoS2 / NiSe2 heterojunction nano array, cobalt atom doping and abundant structure defects are introduced at the same time, and the hydrogen evolution reaction (HER), oxygen evolution reaction (OER) or urea oxidation reaction (UOR) activity of an electrode material in alkaline electrolyte is remarkably improved. The prepared electrode material has the advantages of low cost, high activity, good stability and the like, and has wide application prospects in the fields of water electrolysis, metal-air batteries, domestic sewage treatment and the like.

The invention discloses a graphene-coated hard carbon negative electrode material and a preparation method thereof, and belongs to the technical field of hard carbon negative electrode materials. The preparation method of the graphene-coated hard carbon negative electrode material comprises the following steps: carrying out pretreatment and three-step soaking on coconut shells, carrying out biomass carbonization, mixing with a microbial suspension, and adsorbing to obtain a microbial adsorption type hard carbon material; and then carrying out surface treatment, chemical vapor deposition, impregnation, secondary chemical vapor deposition and annealing treatment on the microbial adsorption type hard carbon material to obtain the graphene coated hard carbon negative electrode material. The negative electrode material prepared by the method is high in first discharge capacity, high in first coulombic efficiency and good in cycle performance.

The invention relates to the technical field of preparation of electrocatalysts, in particular to a super-hydrophilic strong sulfur-phobic bifunctional catalyst as well as a preparation method and application thereof, comprising synthesis of a CoMoFe-LDF / NF hydroxide precursor, preparation of CoMo-Fe3Se4 / NF by hydrothermal selenylation and application of the catalyst in SOR and HER. The structure of the catalyst shows super-hydrophilic performance, wettability between an electrolyte and an electrode can be remarkably improved, hydrogen bubbles are promoted to be released from the surface of the electrode more easily, and therefore sufficient active site supply is guaranteed, and HER efficiency is greatly improved. In addition, the material also shows strong sulfur phobicity, can effectively avoid the deposition of sulfur element on the surface of the catalyst in the SOR process, and reduces the risk of catalyst deactivation. In conclusion, the novel catalyst not only has excellent electrocatalytic activity, but also shows wide application in hydrogen evolution reaction and sulfur ion oxidation reaction.

The invention relates to the technical field of sewage treatment, and discloses a cationic etherifying agent composition for sewage treatment and a preparation method thereof. The cationic etherifying agent composition for sewage treatment is obtained by mixing gemini imidazoline quaternary ammonium salt etherified starch, a chitosan-based graft modified copolymer and poly-aluminum silicate. Nitrogen atoms on an imidazoline ring and a pyrrole ring, hydroxyl and amino can form hydrogen bonds in the flocculation process, so that the interaction between the composition and colloidal particles is enhanced, and the flocculation effect is improved; positive charges in quaternary ammonium salt can react with negative charges carried by suspended particles in sewage, so that the particles are more easily gathered, and the flocculation performance is improved; chitosan and starch molecular chains are relatively long, so that a plurality of pollutant molecules can be adsorbed at the same time, and a bridging effect is achieved; a gemini imidazoline quaternary ammonium salt structure and a cation modified pyrrolidone structure are introduced into starch and chitosan molecules, so that active sites of the starch and chitosan molecules are increased, and the flocculation effect is further enhanced.

The present invention relates to the technical field of glycine preparation, and provides a glycine preparation process, which comprises: S1, mixing monoethanolamine and water, adjusting the pH value to an alkaline state, adding a catalyst, carrying out a reaction, and filtering to obtain a glycine salt solution; s2, acidifying, crystallizing and separating the glycine solution to obtain glycine; the catalyst is a supported catalyst, a carrier of the supported catalyst is hydrotalcite, and an active component precursor of the supported catalyst comprises lanthanum chloride; the mass ratio of the carrier to the active component precursor is 100: (3-10). Through the technical scheme, the problems of low yield and low purity of glycine in related technologies are solved.

This invention relates to a core-shell structured sodium iron phosphate pyrophosphate cathode material, its preparation method, electrode sheet, and battery, belonging to the technical field of methods or devices for directly converting chemical energy into electrical energy. The core-shell structured sodium iron phosphate pyrophosphate cathode material of this invention comprises primary particles, each primary particle including: a core, a sodium iron phosphate pyrophosphate shell layer disposed on at least a portion of the surface of the core, and a carbon coating layer located within the pores and on the surface of the sodium iron phosphate pyrophosphate shell layer; the core includes a NASICON-type sodium-ion inorganic solid electrolyte with an average particle size ≤50nm; the average thickness of the sodium iron phosphate pyrophosphate shell layer is ≤500nm; the chemical formula of the sodium iron phosphate pyrophosphate shell layer is Na₄Fe₂O₃. 3‑ x M x (PO4)2P2O7, 0≤x≤0.9, M is a doped metal element. The core-shell structured sodium iron phosphate pyrophosphate cathode material of this invention combines high solid density, high conductivity and good electrochemical performance.

The invention discloses a Fe / Cu-SAPO-11 adsorption carrier capable of adsorbing NH3 and resisting poisoning as well as a preparation method and application of the Fe / Cu-SAPO-11 adsorption carrier, and belongs to the field of environmental pollution control materials and technologies. The preparation method at least comprises the following steps: in the presence of a source containing aluminum, phosphorus and silicon, performing hydrothermal synthesis, calcining to obtain an SAPO-11 molecular sieve, and finally loading copper by an ion exchange method. And carrying out hydrothermal synthesis on iron oxide, and physically mixing the molecular sieve and the iron oxide to obtain the Fe / Cu-SAPO-11. The Fe / Cu-SAPO-11 prepared in the invention has a micron-scale spherical structure, and iron oxide loaded on the Fe / Cu-SAPO-11 has a regular hexagonal structure with a nano-scale size. Compared with the prior art, the method disclosed by the invention is simple to operate, easy for large-scale production, high in NH3 adsorption efficiency and good in sulfur resistance.

This invention discloses a five-layer electrodeposited high-sealing corrugated pipe based on ultrasound assistance and its preparation method, belonging to the technical field of metal corrugated pipe manufacturing. It aims to solve the problem that in multi-layer electrodeposited corrugated pipes, it is difficult to effectively coordinate current density, surface quality, and interfacial bonding strength, leading to insufficient densification of the deposited layer, unstable interlayer bonding, poor wall thickness uniformity, and failure to meet airtightness standards, ultimately resulting in poor overall performance stability. This invention includes a five-layer composite structure in which the pipe wall is composed of alternating nickel-cobalt alloy and copper layers. Each layer of the five-layer composite structure undergoes ultrasonic vibration treatment during deposition. The corrugated pipe prepared by this invention has a uniform and dense deposited layer with good interlayer bonding. The five-layer alternating deposition layer composite structure not only achieves uniform stress transmission and dispersion, effectively delaying crack propagation and interfacial penetration, but also improves the uniformity of wall thickness distribution, enabling the corrugated pipe to exhibit higher structural stability and long-term reliability in a sealed environment.

This invention discloses a method for preparing and applying chitosan-encapsulated CoCe layered double hydroxide CoCe-LDH. This material can achieve rapid and efficient degradation of roxarsone and removal of the resulting inorganic arsenic. In this material, LDH is encapsulated by chitosan, resulting in a sheet-like material. Chitosan can disperse active sites and adsorb and enrich PMS, while LDH can transfer PMS ions into the anion layer through anion exchange, thereby increasing the active sites. After coupling with the material, PMS is specifically converted to... 1 O2 accelerates the degradation rate.

According to the surface modification method of the sodium-ion battery positive electrode material and the sodium-ion battery positive electrode material provided by the invention, after the positive electrode material is prepared by sintering through a coprecipitation reaction, the sodium-ion battery positive electrode material is subjected to surface modification by using chlorosulfonic acid and liquid nitrogen, so that residual alkali on the surface of the material is eliminated, and moderate surface defects are introduced; active sites are increased, and the electrochemical characteristics of the electrode material are improved. The modified sodium ion battery positive electrode material obtained by the invention has more excellent charge-discharge efficiency and cycling stability, and the method has the advantages of simple process and low cost, and can meet the requirements of large-scale production.

This invention provides a method for preparing a modified konjac emulsifier, relating to the field of konjac processing, comprising: step S1, pretreatment; step S2, preparation of precursor solution; step S3, segmented deacetylation; step S4, preparation of gel particles; step S5, hydrophobic anchoring pretreatment; step S6, graded enzymatic esterification; and step S7, purification and drying. This method, through multiple modifications of konjac glucomannan, obtains a modified konjac emulsifier, effectively solving the problems of strong hydrophilicity and poor emulsifying properties of konjac glucomannan.

The present invention discloses a C / N‑NiCoMn‑LDH / Ag composite electrode material and a preparation method thereof, which are characterized in that the material comprises the preparation of a ZIF‑67 precursor and the preparation of a C / N‑NiCoMn‑LDH / Ag composite electrode material, and the crystallinity and surface active sites thereof are effectively regulated by introducing Mn and Ag elements, and the relatively low crystallinity of the material makes it have a high electrochemical reaction activity, and at the same time, the material is novel in that the sheet assembles a hollow cage structure, the multi-metal composition characteristics and the double-layer protection of nitrogen heteroatom-doped carbon are utilized to improve the electrochemical performance of the material. The method is scientific and reasonable, simple and controllable, and has strong applicability, and can efficiently prepare a composite electrode material with excellent electrochemical performance.

The invention relates to the field of carbon dioxide catalytic conversion, in particular to a Fe-Co micron alloy catalyst and a preparation method and application thereof.The preparation method includes the steps that firstly, a metal salt solution is subjected to hydrazine hydrate reduction treatment under the strong alkaline condition, and the dosage and reaction time of a cyclohexane dispersing agent and an end-capping reagent PEG-400 are adjusted to prepare Fe-Co micron alloy; and drying in air at room temperature to oxidize the surfaces of alloy particles, and then carrying out H2 reduction treatment to obtain the Fe-Co micron alloy with high-dispersion oxygen vacancies on the surface, and the Fe-Co micron alloy can be directly used for CO2 hydrogenation reaction without subsequent treatment. The catalyst is easy to synthesize and good in stability, the prepared catalyst can achieve methane selectivity of more than 99% in a CO2 hydrogenation reaction, and the CO2 conversion rate in a high-pressure reaction kettle can reach 62.5% within 1 h.

The invention provides a dual-signal molecularly imprinted electrochemical sensor based on Cu / Fe-MOF (Metal Organic Framework) and AuNPs (AuNPs) and a preparation method of the dual-signal molecularly imprinted electrochemical sensor. Carbon cloth is used as a substrate, Cu / Fe-MOF grows in situ, an AuNPs modified electrode is electrically deposited, and a double-signal system is constructed; and preparing the molecularly imprinted polymer film layer by using semicarbazide as a template through electro-polymerization. According to the sensor, high-sensitivity detection of semicarbazide is achieved through double-signal change, the linear range is 0.005-100 nM, and the detection limit is 0.0039 nM. According to the invention, a large specific surface area material and a molecular imprinting technology are combined, so that the detection sensitivity and specificity are improved; the dual-signal mode enhances the detection stability and accuracy; the preparation method is simple, low in cost, suitable for quantitative analysis of trace substances and wide in application prospect.

The application discloses a CO-SCR catalyst, a preparation method and application thereof, and the CO-SCR catalyst comprises a cerium-based composite oxide carrier and a noble metal active component, and the noble metal active component is dispersed on the surface of the cerium-based composite oxide carrier by means of a surfactant. The CO-SCR catalyst utilizes the dispersion and loading of the noble metal assisted by the surfactant, so that the CO-SCR catalyst has higher metal dispersion and redox capacity. Meanwhile, the suitable pH value of the carrier surface is also beneficial to the adsorption of CO and NO, and the low-temperature catalytic activity and high-temperature stability of the catalyst are improved, and the CO-SCR catalyst has higher catalytic activity and nitrogen selectivity in the use temperature range of 250 DEG C to 400 DEG C.

The invention discloses a preparation method of a magnetic cottonseed protein nanosphere with high lipase loading capacity, and relates to the technical field of enzyme engineering and lipase loading in the biological industry, and the preparation method comprises the following steps: coating nano Fe3O4 particles by using plant polyphenol and cottonseed protein by using an anti-solvent method to obtain the magnetic cottonseed protein nanosphere; adding the magnetic nano-protein spheres into a lipase solution, loading lipase on the magnetic cottonseed protein nano-spheres by utilizing covalence and secondary action between plant polyphenol and cottonseed protein, and separating, washing and drying to obtain the magnetic cottonseed protein nano-spheres with high lipase loading capacity. According to the preparation method, the magnetic cottonseed protein nanospheres are prepared by coating Fe3O4 nanoparticles with an anti-solvent method, lipase is immobilized on the surfaces of the nanospheres through covalence and secondary action between plant polyphenol and protein, parameters are optimized, and the magnetic cottonseed protein nanospheres with high lipase loading capacity are obtained. The magnetic cottonseed protein nanospheres obtained by the invention can realize efficient catalysis and cyclic utilization of lipase.

The application discloses a high-strength and high-plasticity multi-level mixed heterogeneous structure titanium-based composite material and a preparation method thereof, and the method comprises the following steps: firstly, alumina nanoparticles and amorphous pyrolytic carbon are respectively subjected to activity adjustment and surface modification; secondly, the alumina nanoparticles with high defects and high activity are subjected to pre-coating treatment together with titanium-based powder; thirdly, the surface-modified high-activity amorphous pyrolytic carbon particles are subjected to low-energy ball milling coating together with the pre-coated alumina nanoparticles and the single-level core-shell structure titanium-based powder; and finally, high-strength and high-plasticity multi-level mixed heterogeneous structure titanium-based composite material is obtained through low-temperature short-time large-pulse current plasma sintering. In the application, the alumina nanoparticles and the amorphous pyrolytic carbon are used as the reinforcing phase precursors, and after the activity adjustment and the surface modification, the two are coated on the titanium-based powder in sequence to form the multi-level coated core-shell structure titanium-based powder, and a plurality of kinds of reinforcing phase mixed heterogeneous structures are generated in situ and solid-solution-diffused and precipitated through sintering, so that the strength and plasticity matching performance of the titanium-based composite material is significantly improved.

The invention belongs to the technical field of catalysts, and particularly relates to a biomass derived carbon sphere composite material as well as a preparation method and application thereof. The biomass derived carbon sphere composite material provided by the invention comprises biomass carbon spheres and cobalt bridged with the biomass carbon spheres through nitrogen, wherein the nitrogen is combined with the biomass carbon spheres in a chemical bond form. The biomass derived carbon sphere composite material disclosed by the invention shows excellent catalytic performance in oxygen reduction and oxygen evolution reactions, also has relatively high conductivity, and is suitable for novel energy devices such as zinc-air batteries and fuel cells. According to the invention, apples are used as a precursor, a carbon material with a spherical structure is obtained through a reasonable carbonization process, and a heterogeneous element nitrogen and a non-noble metal component cobalt are doped through a hydrothermal reaction, so that the electro-catalytic performance of the carbon material in an oxygen reduction reaction and an oxygen evolution reaction is further enhanced. The material with oxygen reduction and oxygen evolution reaction catalytic activity is prepared through the simple method, the production cost is low, and industrial production is facilitated.

The application relates to the field of water treatment, and particularly discloses a material membrane and a method for extracting humic acid in leachate. The material membrane comprises, by weight, 10-20 parts of polyvinyl alcohol, 5-10 parts of nano-aluminum oxide, 3-5 parts of mesoporous molecular sieve, 1-3 parts of glycerol and 80-100 parts of deionized water; the preparation method comprises the following steps: uniformly mixing the polyvinyl alcohol, the nano-aluminum oxide, the mesoporous molecular sieve, polyethylene glycol diacrylate and the glycerol, adding the deionized water, stirring and dissolving under the condition of temperature rising to 75-80 DEG C to obtain a mixed solution, pouring the mixed solution into a plane mold, drying and forming the plane mold under the condition of temperature of 50-60 DEG C, and keeping warm for 10-14 hours to obtain the material membrane. The material membrane is used for extracting humic acid in leachate, and has the advantages of reducing the content of humic acid in the leachate.

The invention relates to the technical field of electrochemistry, in particular to a ruthenium / nickel-iron alloy co-embedded carbon fiber material and a preparation method and application thereof. The ruthenium / nickel-iron alloy co-embedded carbon fiber material catalyst is prepared through an electrostatic spinning-carbonization-reduction method, firstly, nanofibers are obtained through electrostatic spinning, active substances can be embedded into the carbon nanofibers through the electrostatic spinning technology, agglomeration of nanoparticles is effectively inhibited, meanwhile, corrosion resistance is improved, and the catalyst is used for preparing the carbon fiber material. The preparation method comprises the following steps: firstly preparing carbon nanofibers, then performing high-temperature carbonization to obtain Ni3Fe-CNFs, enabling the carbon nanofibers to have good electrical conductivity, facilitating electron transfer and charge transfer, and finally loading Ru onto the surfaces of the carbon nanofibers by adopting a sodium borohydride reduction method, so that the HER reaction process is greatly accelerated.

This invention discloses an aminated graphene oxide-based bipolar membrane and its preparation method, belonging to the field of bipolar membrane technology. The bipolar membrane is composed of a sulfonated polyphenylene sulfone cation layer, an aminated graphene oxide interlayer, and a quaternized polyphenylene ether anion layer stacked sequentially. This invention utilizes the aminated graphene oxide as the interlayer, taking advantage of its two-dimensional sheet-like morphology, abundant catalytic groups, and cross-linking effect to achieve a bipolar membrane with low water dissociation voltage, good interlayer compatibility, and structural stability. When applied to electrodialysis, it improves alkali concentration and current efficiency compared to commercially available membranes, while reducing energy consumption, showing promising application prospects in acid and alkali preparation, resource recovery, and other fields.

This invention belongs to the field of capacitor technology and discloses a composite activated carbon, its preparation method, and its application. The composite activated carbon comprises activated carbon and graphene generated in situ. When the composite activated carbon of this invention is used to prepare supercapacitor electrodes, the prepared electrodes have high specific capacitance and high volumetric specific capacitance.

The application relates to the technical field of heavy metal ion detection, in particular to a nitrogen-doped graphene modified paper-based electrode and a preparation method and application thereof. The preparation method provided by the application comprises the following steps: providing filter paper, the filter paper has a hydrophobic region and a non-hydrophobic region, and the surface of the hydrophobic region is provided with a hydrophobic barrier; printing a three-electrode system and a conductive pad on the surface of the filter paper to obtain a paper-based electrode, the three-electrode system comprises a working electrode, a counter electrode and a reference electrode; mixing an ammonium chloride and ammonia water mixed solution and an oxidized graphene solution to obtain an electrolyte; and dropping the electrolyte on the paper-based electrode to perform electrochemical deposition, thereby obtaining a nitrogen-doped graphene modified paper-based electrode. The preparation method is simple in operation and mild in conditions, and the nitrogen-doped graphene electrode prepared by the method has strong anti-interference performance, low detection limit and high sensitivity when simultaneously detecting Cd 2+ , Pb 2+ and Hg 2+ three ions in a water environment.

This invention relates to the field of waste lithium battery recycling technology, specifically disclosing a method for high-value recycling of lithium cobalt oxide battery cathode materials. The method includes the following steps: adding oxalic acid, hydrogen peroxide, and nano-zirconia to the fully discharged and de-aluminum-foil-removed lithium cobalt oxide cathode material, and grinding it in a zirconia ball mill; after grinding, leaching and filtration to separate cobalt oxalate residue and lithium-containing filtrate; adding potassium fluoride to the filtrate to convert it into lithium fluoride, and then regenerating the oxalic acid using Amberlyst-15 ion exchange resin for recycling. This method achieves efficient separation, high-purity recovery, and is economical and environmentally friendly through the synergistic effect of mechanical and chemical action and reagent regeneration technology, providing a feasible path for the high-value recycling of lithium cobalt oxide battery cathode materials.

The invention belongs to the technical field of conductive materials, and particularly relates to a graphene composite conductive material and a preparation method thereof.The graphene composite conductive material is prepared from, by weight, 12-25 parts of MnO2 / graphene composite material, 15-25 parts of graphite powder, 35-50 parts of macromolecule resin and 1-8 parts of filler, according to the MnO2 / graphene composite material, the electron migration efficiency is improved by utilizing the huge specific surface area of graphene, MnO2 particles uniformly grow on a graphene sheet layer, agglomeration and accumulation of the graphene sheet layer in the compounding process can be prevented by uniform loading of MnO2, an effective conductive path is formed by graphite powder and the graphene layer, and the conductivity of the composite material is improved. Functional groups on the surfaces of the graphene and MnO2 are chemically bonded with a macromolecular resin molecular chain, so that the interface interaction is enhanced, and the used filler has relatively high strength and modulus and is used as a reinforcing phase to improve the mechanical property of the graphene composite conductive material.

The application discloses a two-dimensional flexible material compounded by vanadium oxyphosphate and MXene and a preparation method and application thereof, and belongs to the technical field of functional nanomaterial preparation. The application first prepares multilayer vanadium oxyphosphate through a hydrothermal method, then fully mixes vanadium oxyphosphate which is stripped through a liquid phase with MXene and polyacrylonitrile to prepare a spinning liquid, adopts an electrostatic spinning method to obtain a polymer fiber film doped with vanadium oxyphosphate nanosheets, and further carries out calcination and carbonization treatment in an ammonia atmosphere to obtain a flexible porous vanadium-based nanofiber film material. The vanadium oxyphosphate film material prepared by the method has physical properties of rich active sites, high conductivity, sufficient ion transmission channels, good flexibility and excellent self-supporting structure, has the advantages of high activity, high capacity and high stability in energy storage application, and has an excellent application prospect. The preparation process of the application is simple, energy consumption is low, and the application is suitable for industrial large-scale production.

The present invention belongs to the technical field of flue gas desulfurization, discloses a dual-function desulfurization catalyst and its preparation method and application, and solves the technical problems of low cost and low desulfurization efficiency of dual-function desulfurization catalyst in the prior art. The dual-function desulfurization catalyst is used to remove COS and H2S in flue gas at low temperature. The preparation method of the dual-function desulfurization catalyst includes the following steps: impregnating activated carbon in a first modification solution, filtering, drying and heat-treating after the impregnation is completed; the first modification solution contains urea and at least one of soluble copper salt, iron salt and zinc salt; impregnating activated carbon in a second modification solution, filtering, drying and heat-treating after the impregnation is completed, and obtaining a dual-function desulfurization catalyst; the second modification solution contains alkali metal salt and / or alkali.