127results about How to "Increase the active site" patented technology

The invention discloses a catalytic synthesis method of 1, 1, 3, 3, 3-pentafluoropropylene, which comprises the following steps: (1) introducing a raw material 1, 1, 1, 3, 3, 3-hexafluoropropane into a reactor, and reacting under the action of a catalyst to obtain crude 1, 1, 3, 3, 3-pentafluoropropylene, the catalyst containing Cr2O3 and one of metal oxides of Al, Bi and Co; (2) carrying out water washing, alkali washing and drying on the crude 1, 1, 3, 3, 3-pentafluoropropene, and then introducing the crude 1, 1, 3, 3, 3-pentafluoropropene into a first rectifying tower for separation to obtain a mixture containing 1, 1, 1, 3, 3-pentafluoropropene and a small amount of by-products; and (3) introducing the mixture containing 1, 1, 1, 3, 3-pentafluoropropylene and a small amount of by-products into a second rectifying tower, and separating to obtain a 1, 1, 1, 3, 3-pentafluoropropylene product. The method has the advantages of simple process, high catalyst activity, low cost and environmental protection.

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 method comprises the steps that Vs-Zn3In2S6, (NH4) 2MoS4 and an alcoholic solution are mixed, inert gas is introduced, the mixture is placed under a xenon lamp light source to be subjected to a photo-thermal synergistic pulse type deposition reaction, solids are centrifugally collected, washed and dried, and the high-efficiency photocatalytic hydrogen production material is obtained. And grinding to obtain the efficient photocatalytic hydrogen production material. The method solves the problems that the thickness of a deposition layer is not uniform and the deposition time is long in an existing deposition method. The co-catalyst can be directionally deposited on the surface of the semiconductor material in a short time through a photo-thermal synergistic pulse type deposition method, so that the active sites of the material are greatly improved, the reflection of light is reduced, the absorption range of the light is enhanced, and the material has very strong absorption peaks in visible light and near-infrared regions; therefore, the utilization efficiency of sunlight and the photocatalytic conversion efficiency are improved. The method is simple, environmentally friendly, free of precious metal addition and suitable for actual industrial production.

The invention discloses a calcareous purple soil modifier and a preparation method thereof, and belongs to the technical field of soil modifiers, the calcareous purple soil modifier comprises the following components by weight: 15-35 parts of rape straw, 10-30 parts of pleurotus eryngii straw, 10-30 parts of hypsizygus marmoreus residue, 10-25 parts of humic acid, 12-15 parts of activated clay mineral, 5-10 parts of cow dung, 2-4 parts of plant ash, 2-4 parts of tobacco powder, and 1-2 parts of flue ash. 2-3 parts of amino acid powder, 1-2 parts of borax, 1-2 parts of ammonium molybdate, 1-2 parts of zinc sulfate, 1-2 parts of amino acid chelated iron and 2-3 parts of a compound microbial agent. Compared with existing substances, the modifier can delay the degradation rate of organic matters and improve the supplement effect of the organic matters in the soil, the problem of heavy metal enrichment is avoided, and the problems existing in existing modifiers are effectively solved.

The invention relates to the technical field of electrochemical energy storage materials, in particular to a high-performance nitrogen-doped hard carbon negative electrode material prepared on the basis of waste graphite and a preparation method and application of the high-performance nitrogen-doped hard carbon negative electrode material. The preparation method comprises the following steps: crushing and screening graphite, mixing graphite powder with glucose, adding ammonia water, stirring, then adding urea as a nitrogen source, and preserving heat at 1000 + / -50 DEG C to obtain the high-performance nitrogen-doped hard carbon negative electrode material. According to the preparation method provided by the invention, the interlayer spacing of the hard carbon material can be increased, the nitrogen content is increased, the quick charge performance of the material is improved, and the preparation method has relatively high practical value and application prospect.

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.

The invention provides a coated modified precursor material and a preparation method thereof, a coated modified positive electrode material and a preparation method thereof, and a lithium ion battery. The coated and modified precursor material comprises a positive electrode material precursor and a composite material coated on at least part of the surface of the positive electrode material precursor, and the composite material is a composite material of KNbO3 and MoS2. The KNbO3 / MoS2 composite material has the characteristics of rapid ion transfer and high activity sites, and the positive electrode material coated with the composite material can improve the battery capacity, prolong the cycle life and the like of the lithium ion battery.

The embodiment of the invention relates to a germanium-based negative electrode material as well as a preparation method and application thereof. The germanium-based negative electrode material comprises germanium-based composite particles and a carbon coating layer coating the outer surfaces of the germanium-based composite particles, pores of the porous polyaniline form continuous channels and spaces in the porous polyaniline, so that germanium-containing sediments are deposited in the pores of the porous polyaniline to form germanium-based composite particles; the mass percent of the porous polyaniline in the germanium-based composite particles is 15%-95%; the germanium-containing sediment at least comprises elemental germanium, and also comprises or does not comprise silicon-germanium alloy and / or tin-germanium alloy; in the germanium-based negative electrode material, the germanium-based composite particles account for 85%-99% by mass; the germanium elementary substance accounts for 0.1-80% of the germanium-based negative electrode material in percentage by mass; the silicon-germanium alloy or the tin-germanium alloy accounts for 0-15% of the germanium-based negative electrode material in percentage by mass; polar groups-NH <-> and = N <-> of porous polyaniline are used for promoting adsorption and intercalation of lithium ions or sodium ions, active sites of the negative electrode material are increased in the charging and discharging process of the battery, and the electrochemical activity is improved.

The invention discloses a coking wastewater purifying agent and a preparation method and application thereof, the purifying agent is prepared from the following raw materials in parts by weight: 20-25 parts of activated carbon, 18-25 parts of a compound, 4-9 parts of polyacrylamide, 1-5 parts of a surfactant and 60-90 parts of water, and the compound is prepared by compounding pear residues and modified shell carbon. The method is used for solving the technical problem that the coking wastewater cannot reach the discharge standard.

The invention relates to a preparation method and application of a three-dimensional core-shell hydrangea-shaped MnOX-coated Co3O4 catalyst. The method comprises the following steps: carrying out hydrothermal treatment on Co-MOF-74 and an alkali release retarder urea, cooling, and carrying out centrifugal cleaning to obtain three-dimensional nano hydrangea-shaped cobalt carbonate; the preparation method comprises the following steps: dispersing CoCO3 in distilled water, weighing potassium permanganate, dissolving the potassium permanganate in a CoCO3 solution, carrying out heat preservation and centrifugation in a reaction kettle, cleaning in a freeze drying box, and staying overnight to obtain three-dimensional nano hydrangea-shaped MnOX-coated CoCO3 for later use; and carrying out two-stage calcination to obtain the MnOX-coated Co3O4 catalyst with the three-dimensional nano hydrangea-shaped core-shell structure. The preparation process of the MnOX-coated Co3O4 catalyst is simple and easy to implement, no surfactant needs to be additionally added, the preparation condition is mild, large-scale preparation can be achieved, and the MnOX-coated Co3O4 catalyst has wide application prospects and efficient catalytic activity.

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.

The invention discloses a preparation method and application of a rhenium-imprinted silicon-based composite material, and the rhenium-imprinted silicon-based composite material Re (VII)-IIP-DMA is prepared by using a surface ion imprinting technology, taking SiO2 particles as a carrier, taking ReO4 <-> as template ions and taking N, N-dimethylacetamide (DMA) as a functional group through a step-by-step grafting method and the surface ion imprinting technology. Rhenium separation and enrichment are carried out on a single rhenium-containing solution, a binary complex solution and copper smelting waste acid, and the imprinted material has the specific selective recognition capability of rhenium. The prepared silicon-based composite material has the advantages of being wide in application range, high in rhenium selective recognition capacity, good in separation effect, good in material desorption and regeneration performance and the like, and the problem that high-acid and high-anion complex rhenium-containing feed liquid cannot be effectively treated in a traditional rhenium separation method is solved.

The invention discloses a self-supporting two-dimensional crystalline / amorphous NiO / Ni (OH) 2 nanosheet array electrode as well as a preparation method and application of the self-supporting two-dimensional crystalline / amorphous NiO / Ni (OH) 2 nanosheet array electrode. According to the nano-sheet array electrode, a nano-sheet with a crystalline state / amorphous state composite two-dimensional structure is loaded on a foamed nickel substrate of the nano-sheet array electrode, the nano-sheet in the amorphous state is Ni (OH) 2, and the nano-sheet in the crystalline state is NiO nano-crystal. According to the nanosheet array electrode, efficient bifunctional catalysis is achieved through rich active sites and excellent mass transmission capacity. The microscopic surface and interface of the electrode are in seamless contact, so that full exposure of active sites and rapid transfer of charges are promoted, and the catalytic efficiency of an oxygen evolution reaction and a hydrogen evolution reaction is improved. The design not only enhances the catalytic activity, but also ensures the stability of the electrode in long-term application.

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 provides crystal face engineering optimization and electrochemical performance improvement of a NiCo2Se4 electrode material, and belongs to the technical field of energy storage materials.The energy storage performance of the material.By finely adjusting Se vacancy defect concentration, the energy storage performance of the material.Firstly, a high-uniformity NiCo precursor is prepared through a hydrothermal method, high-quality Va-NiCo2Sex is synthesized through the follow-up Se step, and the high-quality Va-NiCo2Sex is prepared; the method is characterized in that a defect regulation and control strategy is introduced, generation of Se vacancies is accurately controlled under different concentrations, a series of Va-NiCo2Sex (a is 0.5-2.5 mol) defect samples with adjustable defect concentration are obtained, the electrode structure regulation and control capability is remarkably enhanced, the structural integrity and morphology optimization of the material are ensured through advanced characterization such as XRD, SEM and TEM, an optimized active substance is adopted for electrode preparation, and the preparation process is simple and convenient. According to the preparation method, a nickel foam current collector is mixed with polyvinylidene fluoride (PVDF) and polyvinylidene fluoride (NMP) binders, the nickel foam current collector is coated with the mixture, an efficient electrode structure is formed, and maximization of electrode performance is achieved through precisely-controlled coating and pressing processes.

The invention discloses a preparation method of a nitrogen-doped carbon layer coated bimetallic material, the preparation method is simple and low in cost, urea is used as a carbon source and an inducer of a carbon layer in a hydrothermal method, and formation of a precursor is promoted; a one-step method is adopted for high-temperature nitridation and reduction, NH3 is generated through decomposition of urea at a high temperature, reduction and nitrogen doping of the bimetallic material are achieved, meanwhile, carbon layer wrapping is formed, and the elemental metal is protected. The catalytic activity of the material is improved due to the addition of the nitrogen element and the synergistic effect of double metals; a carbon skeleton formed by carbon layer wrapping can effectively prevent metal ions from being separated out and improve the dispersity and the stability of the material, so that the material has the potential to become a Fenton-like catalyst.

The invention discloses a negative active material, a preparation method thereof and a preparation method of a negative pole piece, and relates to the technical field of lithium battery processing. The preparation method comprises the following steps: mechanically grinding and mixing a silicon-carbon negative electrode material and zirconium tungstate, baking in a muffle furnace at a high temperature to obtain a negative electrode active material, mixing the negative electrode active material with a binder, a conductive agent, polydopamine modified carbon fiber and carboxymethyl cellulose according to a mass ratio of 85: 10: 5: (1-3): (0.3-0.8), and coating a copper foil with the mixture to prepare a negative electrode piece; wherein the polydopamine modified carbon fiber comprises a silicon-carbon negative electrode material and a plurality of polymers, carbonizing to obtain a porous carbon fiber coated silicon-carbon negative electrode material, and carrying out dopamine deposition to obtain the polydopamine coated carbon fiber. A lithium battery prepared from the negative electrode active material prepared by the invention shows good first charge-discharge efficiency in a test.

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 belongs to the technical field of fine chemical engineering, and particularly relates to a preparation method and application of a double-alkali metal magnesium aluminate spinel catalyst. The preparation method comprises the following steps: mixing pseudo-boehmite and magnesium nitrate, adding the mixture into water, uniformly mixing, adding a dispersing agent and a precipitating agent, stirring, standing, aging, crystallizing, centrifuging, washing, drying and roasting to obtain a spinel carrier MgAl2O4; the spinel carrier MgAl2O4, a modifier and water are subjected to a reaction, hydrothermal crystallization, centrifugation, washing, drying and roasting are performed, and the treated spinel carrier MgAl2O4 is obtained; and mixing lithium nitrate, calcium nitrate, a pre-precipitating agent and water, performing ultrasonic treatment, heating, concentrating and evaporating, performing equivalent-volume impregnation on the treated spinel carrier MgAl2O4, and performing hydrothermal reaction, centrifugation, washing, drying and roasting to obtain the Li2O-CaO / MgAl2O4 double-alkali metal magnesium aluminate spinel catalyst. The preparation method is simple, and the prepared catalyst is low in cost and high in catalytic activity.

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.