361 results about "Ferriferrous Oxide" patented technology

The invention provides an electrolyte, a preparation method thereof and a lithium ion battery, and relates to the field of lithium ion batteries. According to the electrolyte, carbon-coated ferroferric oxide particles are introduced to serve as a magnetic additive, the carbon-coated ferroferric oxide particles are mainly composed of ferroferric oxide nano-particles and porous carbon coating layers coating the surfaces of the ferroferric oxide nano-particles, and the structure enables the ferroferric oxide nano-particles to have good dispersion stability in the electrolyte; and when the electrolyte is under the action of an external magnetic field, the carbon-coated ferroferric oxide particles can generate specific response and movement, and are orderly arranged in a certain direction within milliseconds to form a chain structure and a linear channel, so that the diffusion of lithium ions in the electrolyte is changed from disordered state to ordered state, the transmission rate of the lithium ions is improved, and meanwhile, the performance of the lithium ion battery is improved. And under the magnetic flux superposition effect of the magnetic particles, Li < + > cuts magnetic induction lines, so that the temperature of the electrolyte is increased, and the fast charging performance is further improved. The invention also provides a lithium ion battery which comprises the electrolyte.

The invention relates to the technical field of biological separation materials, and discloses an amine-functionalized magnetic nano composite material and application thereof in protein separation and purification. The material has a core-shell structure and comprises a magnetic ferroferric oxide nano core, an ordered mesoporous silicon dioxide intermediate layer and a covalent grafted polyethyleneimine functional layer. By controlling the matching relationship between the pore diameter of mesopores and the molecular size of the polymer and adopting a crosslinking strategy, the material has high magnetic responsiveness, rapid mass transfer performance and high-density surface amino groups. The material shows high adsorption capacity, rapid adsorption kinetics and good cycle stability in the protein separation process, and is suitable for enrichment purification and metal chelating affinity separation of protein in a biological sample. According to the invention, the technical problems of low protein adsorption capacity, slow dynamics and poor cycling stability caused by compact shell layer, non-uniform amino distribution and limited mass transfer of the existing amine functionalized magnetic material are solved.

The invention provides a biochar repairing agent for marine sediments and a preparation method of the biochar repairing agent, and belongs to the technical field of repairing agents. The preparation method comprises the following steps: carbonizing straws, modifying by phosphoric acid and concentrated nitric acid, depositing ferroferric oxide-titanium dioxide, loading UiO-66-(COOH) 2 on the surface, coupling cyclodextrin-MOF and chitosan, crosslinking, performing magnet separation, washing and drying to obtain the biochar repairing agent for the marine sediments. The biochar repairing agent for the marine sediments prepared by the invention has a relatively large specific surface area and a plurality of coordination groups, can better fix heavy metal ions in the marine sediments, also has a photocatalytic degradation effect on organic pollutants, and is good in mechanical strength, easy to store and transport, safe, environment-friendly and easy to separate; wide application prospects are realized.

The invention belongs to the technical field of lithium battery material recovery, and particularly relates to a method for recovering a waste lithium iron phosphate positive electrode material. The method comprises the following steps: (1) grinding and sieving the positive electrode material of the waste lithium iron phosphate battery, mixing with an alkaline solution, stirring and leaching, and carrying out solid-liquid separation to obtain a lithium-rich solution and leaching residues; (2) introducing a saturated sodium carbonate solution into the obtained lithium-rich solution, carrying out heating reaction, filtering, taking a solid phase, and drying to obtain lithium carbonate; and the obtained leaching residues are dried, and ferroferric oxide is obtained. According to the method, the waste lithium iron phosphate battery positive electrode material is leached through the alkaline liquid phase, it can be guaranteed that lithium and iron in waste lithium iron phosphate are separated through a one-step leaching method, and therefore selective lithium extraction is achieved. The whole technological process is convenient to operate, mild in reaction condition and low in energy consumption, does not need to use any acid or oxidant, avoids generation of a large amount of waste liquid and harmful gas, and is high in selective lithium extraction efficiency.

The invention provides self-adhesive modified asphalt, a self-adhesive modified asphalt waterproof coiled material and a preparation method of the self-adhesive modified asphalt waterproof coiled material, and belongs to the technical field of asphalt and waterproof coiled materials. The self-adhesive modified asphalt is prepared from the following components in percentage by weight: 3 to 30 weight percent of matrix asphalt, 20 to 30 weight percent of aromatic hydrocarbon oil, 3 to 5 weight percent of thermoplastic elastomer, 5 to 8 weight percent of rubber modifier, 5 to 10 weight percent of tackifying resin, 3 to 8 weight percent of dioctyl sodium sulfosuccinate, 1 to 3 weight percent of polyaluminum ferric chloride, 1 to 3 weight percent of ferroferric oxide and 0.5 to 1 weight percent of limestone powder, and 10 to 30 wt% of an inorganic filler.

The application discloses a kind of nano magnetic flocculants and its preparation method and application, belong to drinking water processing technical field, including the following steps: step S1, modified ferroferric oxide nanosphere is ultrasonically dispersed in ammonia alcohol solution, while stirring, slowly drop adding tetraethyl orthosilicate, continue stirring after drop, after centrifugal separation, wash, obtain silica coated ferroferric oxide nanoparticles;Step S2, phenylalanine modified chitosan is added into glacial acetic acid solution, after completely swelling and dissolving, add silica coated ferroferric oxide nanoparticles and ultrasonic treatment, under low pressure ultraviolet lamp, then with anhydrous ethanol wash purification, vacuum drying to constant weight, obtain nano magnetic flocculants;The method of the application is simple and easy to operate, the nano magnetic flocculants prepared can be quickly adsorbed to the surface of sulfonamide antibiotics, produce flocculation and can be magnetically separated, very suitable for trace sulfonamide antibiotics in drinking water source efficient removal.

The invention discloses a preparation method of a nuclear magnetic resonance imaging contrast agent based on surface hepatocyte targeting molecule modification ferroferric oxide nanoparticles, which comprises the following steps: synthesizing ferroferric oxide nanoparticles (Fe3O4 NPs) by a thermal decomposition method, and connecting the Fe3O4 NPs with a ligand dopamine-PEG2000-EOB carrying hepatocyte targeting molecules by a ligand exchange method to obtain the nuclear magnetic resonance imaging contrast agent. The nanoparticles Fe3O4-EOB-PEG capable of carrying out selective T2 nuclear magnetic resonance imaging on the hepatocytes are formed. The method is simple and easy to operate, the controllability of the preparation process is high, the biocompatibility of the obtained product is good, T2 signals of hepatocytes can be remarkably improved, the good early diagnosis effect on liver tumors is achieved, and wide application prospects are achieved.

The invention discloses an intelligent purification coating with a bionic pulmonary membrane type respiratory metabolism function. The intelligent purification coating comprises a sensing and adsorption layer, a driving and transportation layer and a catalysis and metabolism unit, the sensing and adsorption layer is composed of a chemical heterojunction network formed by two-dimensional transition metal carbonitride MXene and a zeolite imidazate framework structure material through an in-situ coordination reaction of metal ions and hydroxyl groups on the surface of MXene; the driving and transporting layer takes a cross-linked liquid crystal elastomer network as an intelligent response matrix, and high-length-diameter-ratio magnetic ferroferric oxide nanorods of which the surfaces are modified by a silane coupling agent are uniformly dispersed and embedded into the matrix; and the catalysis and metabolism layer is anchored on a preset key mass transfer path in the driving and transporting layer in a discrete metabolism island form. According to the coating, various volatile organic compounds (VOCs) and enzyme-light synergistic deep mineralization can be realized under mild conditions, and the energy metabolism function of mitochondria can be accurately simulated.

The invention relates to the technical field of recycling of waste battery materials, and discloses a recycling method of lithium iron phosphate battery waste, which comprises the following steps: carrying out sufficient acid leaching on the lithium iron phosphate battery waste, and carrying out solid-liquid separation to obtain a leachate; adding a sufficient amount of iron ion complexing agent competing with phosphate radicals and a sufficient amount of lithium precipitation inhibitor competing with lithium ions into the leachate, and diluting to obtain a mixed solution; the temperature is controlled to be 20-50 DEG C, alkali liquor is gradually added into the mixed solution, when the pH value of the solution reaches 3.5-4.5, the alkali liquor continues to be added, oxygen is introduced into the solution at the same time, when ferrous iron in the solution is oxidized to 30-40%, oxygen introduction is stopped, the condition is maintained for 8-12 min, after it is detected that a ferroferric oxide product appears in a system, the pH value of the solution is rapidly adjusted to 7.5-8.5, and the ferroferric oxide product is obtained. Fully aging to obtain slurry containing ferroferric oxide; and ferroferric oxide is extracted from the slurry. According to the method, ferroferric oxide with relatively high purity can be recovered and obtained.

The invention relates to a novel phosphorus-fluorine curing agent for phosphogypsum and a preparation method thereof, and belongs to the technical field of industrial solid waste treatment and resource utilization. The curing agent comprises superfine slag powder, anhydrous sodium sulfate, water glass, water, sodium hydroxide and a Fe3O4 (at) SiO2 (at) Zr-Al bimetallic oxide stabilizer. The Fe3O4 (at) SiO2 (at) Zr-Al bimetallic oxide stabilizer is of a core-shell structure, magnetic ferroferric oxide particles serve as a core, and the surfaces of the magnetic ferroferric oxide particles are sequentially coated with an amorphous silicon dioxide protection layer and an active layer. And the active layer is an amorphous and porous zirconium-aluminum bimetallic oxide with a network structure. The preparation method of the curing agent is simple, mild in condition and easy for industrial production, the main raw material is the industrial solid waste slag, the effect of treating waste with waste is achieved, the agent addition amount is small, and the comprehensive treatment cost is low.

The invention discloses an iron-based nanoparticle and titanium dioxide magnetoelectric core-shell structure composite wave-absorbing material and a preparation method thereof, and belongs to the technical field of microwave absorbing materials. According to the preparation method, ferroferric oxide coated with titanium dioxide is taken as a precursor, and based on a confinement hydrogen reduction process, the relative content of a titanium dioxide shell layer and an iron and iron oxide composite core is changed by adjusting the dosage of tetrabutyl titanate, so that the construction and regulation of the magnetoelectric core-shell structure are realized. In the obtained composite wave-absorbing material, iron in the magnetic core can provide strong magnetic loss, iron oxide can improve impedance matching characteristics and introduce dielectric loss, and the titanium dioxide shell layer can enhance interface polarization and optimize impedance matching, so that the composite wave-absorbing material shows excellent low-thickness and broadband wave-absorbing characteristics. Meanwhile, the preparation process disclosed by the invention does not need large complex equipment, does not involve the use of highly toxic compounds, and has a relatively high popularization value.

The invention provides an electromagnetic shielding composite material. The electromagnetic shielding composite material comprises the following components: a polymer matrix, a compatilizer, a conductive filler, a cross-linking agent and a foaming agent. According to the invention, polyethylene is used as a matrix, maleic anhydride grafted polyethylene is used as a compatilizer to improve the compatibility of the material to a filler, and the ethylene-vinyl acetate copolymer is added to improve the compatibility of the filler and improve the foaming performance of the composite material; carbon black, carbon fibers and ferroferric oxide are selected as conductive fillers, and the fillers form a three-dimensional conductive network in the material in a certain proportion, so that the material has excellent conductivity and excellent electromagnetic shielding performance; and a closed micropore structure is formed in the material through chemical foaming, so that the electromagnetic shielding performance of the composite material is further enhanced.

The invention discloses a multi-band high-stability ferrite magnetic material composite formula and a preparation process, and relates to the technical field of magnetic materials. The ferrite magnetic material composite formula comprises 38-42 parts of ferric oxide powder, 37-41 parts of ferroferric oxide powder, 6-12 parts of graphene nanosheets, 5-7 parts of hydroxypropyl methyl cellulose, 6-9 parts of lanthanum oxide, 4-6 parts of scandium oxide, 1-3 parts of nano titanium dioxide, 4-6 parts of bismuth magnesium boron, 9-13 parts of ferric sulfate, 3-5 parts of manganese sulfate, 4-6 parts of zinc sulfate, 2-4 parts of copper sulfate and 2-3 parts of samarium sulfate. By utilizing a physical vapor deposition gradient doping process, the problems that an existing ferrite magnetic material is single in electromagnetic performance, cannot stably and efficiently work in a multi-frequency-band complex electromagnetic environment and cannot meet the requirements of the fields of communication, radar, electronic countermeasure and the like for wide-frequency-band and high-performance magnetic materials can be solved.

This invention provides a method for preparing a tandem catalyst and its application in degrading organic matter in wastewater, belonging to the field of wastewater treatment technology. The tandem catalyst is prepared by co-precipitation of ferrous chloride, ferric chloride, and aluminum nitrate, followed by grinding and calcination with high-temperature kerosene and activated carbon. The tandem catalyst is then applied to degrade organic matter in wastewater. The tandem catalyst prepared by this invention comprises a hierarchical porous carbon support and a co-precipitate of iron(III) oxide and aluminum(III) oxide supported on the surface of the hierarchical porous carbon support. Using hierarchical porous carbon as the support and aluminum(III) oxide and iron(III) oxide in series as the catalyst facilitates the ozone decomposition of organic matter. The tandem catalyst of this invention can effectively degrade organic matter, achieving a degradation rate of over 95% for both total cyanide and ammonia nitrogen.

The invention provides a red foamed ceramic wall body material. The red foamed ceramic wall body material is prepared from the following raw material components in parts by weight: 50 to 78 parts of waste glass powder, 0 to 20 parts of fly ash, 10 to 20 parts of magnesium-iron hydrotalcite, 10 to 20 parts of limestone and 2 to 5 parts of borax. According to the invention, magnesium iron hydrotalcite is subjected to in-situ decomposition to generate pleonaste, the red color of ferric ions is retained, the red foamed ceramic is prepared, and black ferrous oxide or ferroferric oxide is prevented from being generated.

The invention discloses a magnetic-aptamer targeting tumor tissue nano-drug delivery system as well as a preparation method and application thereof, and belongs to the field of medicines. The system comprises a mesoporous ferroferric oxide magnetic core, a polyethyleneimine (PEI) layer coated outside the mesoporous ferroferric oxide magnetic core and an aptamer adsorbed outside the PEI layer, and an autophagy activator can be selectively loaded in the mesoporous core. The preparation method comprises the following steps: sequentially carrying out drug loading, PEI coating and aptamer modification on the mesoporous Fe3O4 nanoparticles. According to the invention, efficient enrichment and endocytosis of tumor tissues are realized through dual effects of magnetic targeting and active targeting of the aptamer; lysosome escape is promoted by using the proton sponge effect of PEI; finally, by virtue of the synergistic effect of iron ions released by degradation of the Fe3O4 nanoparticles and endogenous iron ions released by ferritin autophagy induced by an autophagy activator, ferroptosis of tumor cells is induced through enhanced Fenton-like reaction, so that high-efficiency and low-toxicity targeted therapy is realized.

The invention provides a magnetic interface open type fluid chip and a preparation method thereof, and belongs to the technical field of microfluidics and millifluidics. The method comprises the following steps: performing standardization treatment on ferroferric oxide powder to obtain magnetic hydrophobic particles; then wrapping the target liquid with the particles through controllable shaking to form a smooth liquid cake with a magnetic response core-shell structure; dehydrating the smooth liquid cake through programmed stepped heating evaporation treatment to form a wrinkled liquid cake; and finally, cutting and shaping the wrinkled liquid cake by using laser to obtain the magnetic interface open type fluid chip. The magnetic particles form a stable wrapping layer on a liquid-gas interface, so that the chip structure can stably exist in the air without being supported by an oil phase; meanwhile, the optical fiber laser is used for accurately cutting the liquid cake, the channel configuration can be flexibly reconstructed on site according to requirements, and the problems that in the prior art, the environment dependence is high, and the configuration is solidified are effectively solved.

The invention relates to integrated preparation and synthetic ammonia application of a cobalt-ferroferric oxide / ferrous oxide loaded foam iron self-supporting electrode. The invention relates to a preparation method and application of a cobalt-ferroferric oxide / ferrous oxide loaded foam iron (Co-Fe3O4 / FeO (at) IF) self-supporting electrode with high ammonia yield and Faraday efficiency in the field of nano materials. The invention aims to solve the problems of low electrochemical nitrate reduction synthesis ammonia yield and low Faraday efficiency. The preparation method comprises the following steps: taking cobalt nitrate hexahydrate and 2, 5-dihydroxy terephthalic acid (H4DOBDC) as raw materials, preparing Co-MOF-74 through a one-step hydrothermal reaction, then preparing a Co / Fe-MOF-74 (at) IF precursor material from foam iron (IF), the Co-MOF-74 and the H4DOBDC, and finally, successfully preparing the cobalt-doped self-supporting electrode Co-Fe3O4 / FeO (at) IF with high ammonia yield and Faraday efficiency through tube furnace calcination. The electrode can be directly used as a working electrode for electrocatalytic nitrate reduction synthesis of ammonia.

The application discloses a magnesium-based composite material and a preparation method and application thereof. The magnesium-based composite material comprises ferroferric oxide and a magnesium alloy. The magnesium alloy comprises the following components in percentage by weight: 3wt.%-6wt.% of Zn, 0.3wt.%-0.8wt.% of Ca, and the rest of Mg and inevitable impurities. The magnesium-based composite material can effectively solve the problem that micron-sized particles are easy to agglomerate in a metal liquid when the magnesium alloy is modified, and the plasticity of the alloy is reduced and the alloy is not easy to be formed.

The application discloses a kind of magnetically responsive hydrogel optical fiber and its preparation and application, belong to medical biomaterial field.The optical fiber includes from inside to outside: polyethylene glycol diacrylate and acrylamide photocrosslinking light transmission core layer;Calcium alginate low refractive index skin layer;Doped nano-magnetic response layer of ferriferrous oxide;And polydopamine grafting polyvinylpyrrolidone lubricating layer.It is prepared by coaxial extrusion and light / calcium step-by-step crosslinking.The structure realizes the spatial isolation and anti-interference of light transmission and magnetic drive, has low background light loss and anti-bending stability, has biomechanics matching, ultra-low friction and magnetic field accurate active navigation ability, solves the pain point that extremely soft optical fiber is difficult to directional intervention.Suitable for deep tissue precise photothermal therapy, in vivo continuous optical sensing and minimally invasive diagnosis and treatment integration and other frontier medical fields.

The application provides a method for preparing a magnetic heterostructure material of magnetite-graphene and application of the magnetic heterostructure material in a directional heat-conducting composite material, and belongs to the technical field of composite materials. The method comprises the following steps: (1) slowly adding a sodium hydroxide solution into a ferric chloride solution under water bath condition to prepare a ferric hydroxide gel, and sequentially performing drying and aging, centrifugation, cleaning and freeze drying on the gel to obtain a ferrous oxide nanocrystal; (2) adding the ferrous oxide nanocrystal, graphene and dopamine hydrochloride into a Tris buffer solution and fully stirring, and performing multiple centrifugation, cleaning and freeze drying to obtain ferrous oxide-dopamine-graphene; and (3) performing calcination reduction on the ferrous oxide-dopamine-graphene to obtain the magnetic heterostructure material of magnetite-graphene. The magnetic heterostructure material prepared by the method can be applied to the preparation of the directional heat-conducting composite material as a heat-conducting filler, and has the advantages of high operability, low cost and the like.

The present invention belongs to the technical field of home furnishings, and provides a material for preparing polymeric air fibers, and a preparation method therefor and the use thereof. The preparation method comprises: preparing a ceramic powder doped with antibacterial TiO2 / ZnO / ZrO2; depositing magnetic ferroferric oxide thereon; after the surface is modified by tannic acid, adding same to a water-soluble chitosan solution; immersing same in a TPEE air fiber membrane prepared by means of melt-blowing; uniformly adding a genipin solution dropwise; heating and reacting same; and taking out the membrane, washing and drying same to obtain a material for preparing polymeric air fibers. The TPEE air fiber membrane prepared in the present invention has good mechanical properties, and the modified ceramic powder is uniformly dispersed in the TPEE air fiber membrane, achieving good antibacterial, environmental protection, immunity regulation, magnetic therapy, far-infrared heating and other effects, such that the prepared material for preparing polymeric air fibers has better overall performance. Thus, the material is a good mattress support material, and has broad application prospects.

The invention discloses a microbubble adsorption phosphorus removal material for sewage treatment, a phosphorus removal method and application, and belongs to the technical field of sewage treatment.The microbubble adsorption phosphorus removal material is prepared by the steps that straw fibers serve as a matrix, hydrothermal synthesis is conducted, and nanometer ferroferric oxide is loaded to obtain fiber composite powder; lanthanum MOF is synthesized on the surface of the fiber composite powder in situ, lanthanum MOF loaded fiber composite powder is obtained, hydrophobic modification is carried out, and the microbubble adsorption phosphorus removal material for sewage treatment is obtained. According to the microbubble adsorption phosphorus removal material for sewage treatment, ferroferric oxide and lanthanum MOF can remarkably enhance the adsorption capacity and phosphorus selectivity, the hydrophobic layer can adapt to a microbubble technology, in-situ loading and coordination anchoring of all components ensure the structural stability of the material, component loss in recycling is reduced, and the service life of the material is prolonged. And finally, the efficient and stable microbubble adsorption phosphorus removal effect is achieved.

The invention discloses a low-voltage polarizable magnetic dielectric microsphere, a preparation method thereof and application of the low-voltage polarizable magnetic dielectric microsphere to adsorption of PFASs, and relates to the technical field of environmental functional materials. The microsphere has a core-shell structure of a conductive magnetic core-dielectric shell, the core is composed of ferroferric oxide and a carbon material, and the shell is a sodium alginate gel layer. The preparation method comprises the following steps: calcining the iron-carbon composite material, mixing a sodium alginate solution, cross-linking calcium lactate / calcium chloride step by step and the like. The microspheres can be subjected to interface polarization under the external 0.2-2 V / cm low-voltage direct-current electric field, a strong local electric field is generated to enhance electrostatic adsorption, meanwhile, the mass transfer and adsorption process of PFASs is synergistically enhanced through electrophoresis and electroosmotic flow effects, the adsorption rate and capacity are remarkably improved, and rapid separation can be achieved through a magnetic field. The material and the method are suitable for efficiently and deeply removing anionic PFASs in wastewater, and have the advantages of low energy consumption, high efficiency, simplicity and convenience in operation and the like.

The invention discloses a magnetic limited phosphorus-doped photocatalyst as well as a preparation method and application thereof, and belongs to the field of functional materials for pretreatment of environmental chemical pollutants. The preparation method comprises the following steps: preparing magnetic Fe3O4.TiO2 by adopting a microwave method, and introducing a C18 modified carbon framework material and phosphate ions by taking the magnetic Fe3O4.TiO2 as a matrix to prepare the magnetic limited-access phosphorus-doped photocatalyst. The magnetic limited phosphorus-doped photocatalyst disclosed by the invention has the ultrahigh saturated adsorption capacity of a C18 modified carbon framework material, the instantaneous solid-liquid separation capacity and the efficient photocatalytic degradation capacity of nano titanium dioxide modified magnetic ferroferric oxide and the synergistic photocatalytic performance of phosphate; the problem that a traditional photocatalyst is poor in adsorption capacity is fundamentally solved, and the photocatalyst has more advantages in the aspects of adsorption removal and photocatalytic degradation of bisphenol organic pollutants in an environmental water sample.

The application discloses a preparation method of a heat-stable reducing agent for copper smelting. The heat-stable reducing agent for copper smelting is prepared by taking iron-containing materials as aggregates, carbon-containing materials as fine materials, crushing and screening the two kinds of materials respectively, uniformly mixing the two kinds of materials according to a proportion, adding a certain amount of high-temperature binder as a filler, continuously stirring and uniformly mixing, and then pressing and forming. The reducing agent obtained by the method has a certain heat stability at a high temperature of 1100-1350 DEG C. Meanwhile, the specific particle size distribution of the reducing agent can make the reducing agent obtain a larger crack density and a higher crack network degree, so that the reducing agent can reduce the occurrence of pulverization and fragmentation when suddenly falling from normal temperature to a high-temperature melt of 1300 DEG C, improve the utilization rate of the reducing agent, and significantly improve the efficiency of reducing ferric oxide in copper smelting.

The invention discloses a human blood coagulation factor VIII and a preparation method thereof, and the preparation method comprises the following steps: S1, carrying out refrigerated centrifugation on cryoprecipitate to obtain an extracting solution; s2, mixing the extracting solution and the heparin sodium solution to obtain a dissolving solution; s3, adjusting the pH value of the dissolving solution to 6.2-6.4 by using hydrochloric acid, and controlling the temperature to be 20-30 DEG C to obtain an acid precipitate; s4, mixing the acid precipitate with polyethylene glycol to obtain a polyethylene glycol precipitate; s5, adding the carboxylated ferroferric oxide nano-particles into the polyethylene glycol precipitate, incubating, and carrying out magnetic separation to obtain a first separation solution; s6, performing centrifugal separation on the first separation liquid to obtain a second separation liquid; s7, clarifying and filtering the second separation liquid, and adjusting the pH value to 6.4-7.4 to obtain a clarified liquid; and S8, adding a stabilizer and an inactivator into the clear liquid, and carrying out water bath heat preservation to obtain a human blood coagulation factor VIII stock solution. The method has the effect of improving the recovery activity and purity of the human blood coagulation factor VIII.

The invention relates to the technical field of electromagnetic functional materials, and provides a frequency-band-adjustable ferromagnetic core-shell nanorod wave-absorbing material and a preparation method thereof.The preparation method comprises the steps that an iron oxyhydroxide precursor is prepared through a hydrothermal synthesis method, the iron oxyhydroxide precursor is reduced through a liquid-phase pyrolysis method, and nanorod-shaped ferroferric oxide is obtained; growing a carbon layer on the surface of the nanorod-like ferroferric oxide through a high-temperature sintering method to obtain the nanorod-like ferroferric oxide composite material coated with the ultrathin carbon layer; and carrying out orientation arrangement on the nanorod-like ferroferric oxide composite material coated with the ultrathin carbon layer through magnetic field control. According to the invention, cooperation of structural design and light weight, improvement, regulation and control of electromagnetic characteristics and improvement of electromagnetic wave absorption efficiency can be realized.

The invention discloses a chitosan modified ferroferric oxide / carboxylated multi-walled carbon nanotube-based molecularly imprinted electrochemical sensor as well as a preparation method and application thereof, and relates to the technical field of electrochemical sensing. The invention aims to solve the problems that the existing method for detecting carbendazim is complicated to operate and high in cost and the traditional sensor is poor in selectivity. The invention discloses a molecularly imprinted electrochemical sensor based on chitosan modified ferroferric oxide / carboxylated multi-walled carbon nanotubes. The molecularly imprinted electrochemical sensor comprises a glassy carbon electrode, and a molecularly imprinted polymer and CS-Fe3O4-CMWCNTs which are modified on the surface of the glassy carbon electrode, the molecularly imprinted polymer is prepared by taking carbendazim as a template molecule, methacrylic acid as a functional monomer, ethylene glycol dimethacrylate as a cross-linking agent and azodiisobutyronitrile as an initiator. The molecularly imprinted electrochemical sensor is applied to detection of carbendazim.