551 results about "Ferriferrous Oxide" patented technology

The invention belongs to the technical field of energy storage materials, and particularly relates to a high-entropy oxide Fe0. 2Co0. 2Ni0. 2Cu0. 2Zn0. 2O and an ultrafast synthesis method and application thereof. According to the preparation method, ferroferric oxide, cobalt oxide, nickel oxide, copper oxide and zinc oxide with equal molar ratio are adopted as direct synthesis raw materials, toxic gases such as chlorine and nitrogen dioxide generated in the synthesis process of a metal salt precursor are avoided, and the uniformly distributed single-phase high-entropy oxide is synthesized in an ultrafast manner within 10 seconds by using a Joule heating technology; the synthesized high-entropy oxide is used as a lithium ion battery negative electrode material, and shows more excellent electrochemical performance and cycling stability compared with other high-entropy oxides prepared from transition metals with different proportions; in the preparation process, extra additives are not needed, operation is easy, the synthesis speed is high, the yield is high, element distribution is uniform, and the method has the advantages of being low in cost, high in efficiency and free of pollution and has the industrialization prospect.

The invention relates to the field of biological medicine, in particular to IMSFs hydrogel, a ferroptosis induction system, a preparation method and application. The IMSFs hydrogel comprises a hydrogel body, and ferroferric oxide nanoparticles and sorafenib are loaded in the hydrogel body in a wrapping manner. The IMSFs hydrogel can be used as an injectable cascade ferroptosis anti-cancer drug. The preparation method of the IMSFs hydrogel comprises the following steps: firstly, preparing a silk fibroin-hyaluronic acid hydrogel body: dissolving silk hydrogel and hyaluronic acid in a lithium bromide solution; bDDE is added into the dissolved solution, and incubation is carried out; then dialyzing and washing with deionized water to obtain a silk fibroin-hyaluronic acid hydrogel body; and then loading the sorafenib nanoparticles and the ferroferric oxide nanoparticles into the silk fibroin-hyaluronic acid hydrogel body. The IMSFs hydrogel disclosed by the invention integrates magnetic thermal response and drug controlled release, and can be injected to a tumor site, so that the treatment effect on TNBC is remarkably improved.

The invention relates to a light / heat / magnetic detachable high-strength polyurethane adhesive as well as a preparation method and application thereof. The light / heat / magnetic detachable high-strength polyurethane adhesive comprises a polyurethane adhesive and a functional filler. According to the light / heat / magnetic detachable high-strength polyurethane adhesive prepared by the preparation method disclosed by the invention, the colloid is black, and the adhesive has excellent light absorption performance and can realize rapid separation of an adhesive interface under infrared irradiation through a heat effect; meanwhile, the ferroferric oxide can be vibrated and heated under the action of an external magnetic field due to the magnetic response characteristic of the ferroferric oxide, so that fracture and separation of the adhesive layer are promoted. By means of the technology, efficient and reversible disassembly of parts bonded through the hot melt adhesive is achieved, possibility is provided for recycling and reusing of bonding materials and devices, and the problem that traditional polyurethane hot melt adhesive cannot be recycled is solved.

The invention provides a wave-absorbing material, and belongs to the technical field of electromagnetic wave absorption. The wave-absorbing material comprises a metal reflection bottom layer, a wave-absorbing middle layer and a scattering upper layer, the wave-absorbing middle layer is made of a ferroferric oxide loaded reduced graphene oxide and epoxy resin (Fe3O4 (at) RGO / EP) composite material and used for absorbing electromagnetic wave energy, and the scattering upper layer is of a patterned metasurface structure made of chopped carbon fiber reinforced epoxy resin (SCF / EP). And a phase-regulated two-dimensional periodic array is formed. By arranging a three-layer structure of the metal reflecting layer, the Fe3O4 (at) RGO / epoxy composite wave-absorbing layer and the chopped carbon fiber scattering layer, broadband absorption and directional scattering control of electromagnetic waves within the range of 2-18 GHz are achieved, a stealth function composite material system with dissipation and deflection dual-mechanism cooperative work is formed, the structure utilizes the patterning design of the scattering layer, and the structure has the advantages that the structure is simple, the structure is compact, and the application range is wide. On the basis of the generalized Snell's law, engineering regulation and control of the radar wave reflection direction are achieved by regulating and controlling the reflection phase difference between pattern units, reflection energy is effectively deviated from the main lobe direction of a radar receiver, and therefore the reflection signal intensity of a target in a radar detection system is reduced.

The invention relates to the field of water purifying agents, and discloses a polyaluminum chloride water purifying agent for printing and dyeing wastewater and a preparation method thereof.The polyaluminum chloride water purifying agent for printing and dyeing wastewater is prepared from polyaluminum chloride, an adsorption additive, magnetic composite filler and the balance deionized water; the adsorption additive is prepared by ultrasonically compounding a modified ZIF-8 coated iron material and modified nano titanium dioxide; the modified ZIF-8 coated iron material is prepared by coating nano zero-valent iron with ZIF-8 and carrying out high-temperature carbonization. The modified nano titanium dioxide is prepared by doping and modifying cerium; the magnetic composite filler is prepared by the following steps: pretreating sepiolite by using hydrochloric acid, then coating the surface of the pretreated sepiolite with chitosan by adopting a coprecipitation method, and loading ferroferric oxide particles into the chitosan. Therefore, the usage amount of polyaluminum chloride is reduced, and the water purifying agent is endowed with excellent photocatalytic activity and adsorption effect in printing and dyeing wastewater.

The invention discloses a sewage zero discharge treatment device which comprises a sewage treatment tank, a first partition plate, a second partition plate, a third partition plate and a fourth partition plate are arranged in the sewage treatment tank, a closed area between the third partition plate and the fourth partition plate forms a collection pool, and a rotating magnetic field device is arranged on the periphery of an anaerobic pool. The rotating magnetic field device generates a rotating magnetic field, ferroferric oxide nanoparticles with the surfaces modified with sulfonic acid groups exist in the anaerobic tank, the ferroferric oxide nanoparticles have superparamagnetism and are driven by the rotating magnetic field to form a directional vortex flow, and the ferroferric oxide nanoparticles adsorb protons and load anaerobic microorganisms. A magnetic biological membrane is formed, meanwhile, the mixed mass transfer efficiency of microorganisms and sewage is enhanced through the directional vortex flow, an ultrasonic vibrator array is arranged at the bottom of the aerobic tank, and a collecting device is arranged above the sewage treatment tank.

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 provides application of Fe3O4 nanoparticles in preparation of a medicine for treating benign prostatic hyperplasia, and relates to the technical field of biological medicines. The invention further discloses application of the Fe3O4 nano-particles in preparation of a medicine for treating benign prostatic hyperplasia. The research result of the invention emphasizes that the ferroferric oxide nanoparticles are a promising candidate drug for targeted therapy of BPH and related prostate diseases, and new possibility is provided for treatment intervention of urinary surgery. The inventor studies the effect of the Fe3O4 nanoparticles in inhibiting benign prostatic hyperplasia. Results of the inventor show that the nanoparticles not only effectively reduce the proliferation rate of prostate cells, but also improve related biochemical indexes. Therefore, the polypeptide has potential application in treatment of prostatic hyperplasia.

The invention discloses a preparation method of a wear-resistant magnetic composite nano ferroferric oxide material, and belongs to the technical field of nano ferroferric oxide materials.The preparation method comprises the steps that coated modified ferroferric oxide composite powder, silver nitrate and absolute methanol are added into a reaction kettle, stirring and ultrasonic dispersion are conducted, then 2-aminoterephthalic acid is added, stirring and mixing are conducted, and a mixture is obtained; and after the reaction, separating to obtain the wear-resistant magnetic composite nano ferroferric oxide material. The wear-resistant magnetic composite nano ferroferric oxide material prepared by the preparation method disclosed by the invention overcomes the problem that an existing ferrite material is relatively single in electromagnetic loss mechanism in the aspect of nickel-phosphorus plated fabric, and the electromagnetic shielding effectiveness of the fabric is improved; the coated modified ferroferric oxide composite powder has good dispersity, a polydopamine coating layer on the surface of the coated modified ferroferric oxide composite powder improves the anchoring effect on silver MOF particles through a mussel-like adhesion interface, meanwhile, stress is dispersed and crack propagation is reduced through the buffering effect of the polydopamine coating layer, and the mechanical stability of the wear-resistant magnetic composite nano ferroferric oxide material is improved.

The invention discloses an ultraviolet-aging-resistant high-toughness wind power cable and a preparation method thereof, belongs to the technical field of cable preparation, is used for solving the technical problem that the ultraviolet aging resistance and toughness of a wind power cable in the prior art need to be further improved, and specifically comprises a wire layer, a shielding layer and a sheath layer; the preparation method comprises the following steps: coating an organic silicon layer on the outer side of a nano titanium dioxide particle and modifying amino to obtain a modified chain extender, carrying out chain extension on a long-chain polyurethane structure to obtain composite polyurethane, and carrying out hydrolysis by taking activated glass microspheres as a matrix and tetramethyl orthosilicate as a supplement to obtain modified aerogel. The preparation method comprises the following steps: preparing modified aerogel, modifying ferroferric oxide particles on the modified aerogel by using in-situ loading, further modifying perfluoro groups to obtain composite aerogel, finally mixing composite polyurethane, the composite aerogel and auxiliary materials, and performing melt extrusion to obtain a sheath layer of the wind power cable, thereby obtaining the wind power cable.

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 discloses a black phosphorus-based composite material as well as a preparation method and application thereof, and relates to the technical field of black phosphorus materials. The black phosphorus-based composite material is prepared from the following raw materials: black phosphorus, nano ferroferric oxide and dopamine hydrochloride. The dopamine hydrochloride is subjected to in-situ polymerization to form polydopamine. The obtained black phosphorus-based composite material has a low friction coefficient and an excellent lubricating effect, can be used for preparing a lubricant, for example, as a lubricating additive in lubricating oil or lubricating grease, effectively improves the friction performance of the lubricant, improves the lubricating effect of the lubricant, and is suitable for lubrication of mechanical parts.

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 the technical field of wave-absorbing coatings, and discloses a radar wave-absorbing coating and a preparation method thereof.The radar wave-absorbing coating is prepared from, by weight, 100 parts of waterborne polyurethane emulsion, 0.4-1.6 parts of graphene oxide, 0.3-2 parts of modified ferroferric oxide and the like; a plurality of hydrophilic hydroxyl groups and carboxyl groups are introduced on the surface of the nano ferroferric oxide, so that the surface hydrophilicity is improved, and the nano ferroferric oxide is uniformly dispersed in the waterborne polyurethane coating, so that the coating has higher mechanical strength and tensile property. And a plurality of hydroxyl groups and carboxyl groups introduced on the surface of the nano ferroferric oxide and hydroxyl groups and carboxyl groups on the surface of the graphene oxide interact with each other to form hydrogen bonds and the like, so that the interface action between the nano ferroferric oxide and the graphene oxide is improved, the impedance matching performance of the nano ferroferric oxide and the graphene oxide is improved, the interface polarization effect is formed, and the absorption effect of the coating on electromagnetic waves is improved.

The invention relates to a reversible hydrophilic / hydrophobic magnetic biomass foam material as well as a preparation method and application thereof. According to the magnetic biomass foam material, biomass waste is adopted as a matrix, a zinc chloride / phosphoric acid / ammonium dihydrogen phosphate three-component eutectic solvent is used for processing and preparing nano cellulose under the room temperature condition, a normal-pressure foaming technology is used, lauryl sodium sulfate, titanium dioxide and a ferroferric oxide modified solution are introduced, and the magnetic biomass foam material is prepared. The preparation method comprises the following steps: preparing a magnetic biomass foam material, adding a methyltrimethoxysilane / tetramethoxysilane copolymer emulsion, carrying out low-temperature gradient drying to prepare the magnetic biomass foam material in one step, and regulating and controlling an interface group through a water / ethanol solvent to realize on-demand switching of hydrophilic / hydrophobic properties of the magnetic biomass foam material. The problems that a biomass foam material is single in function and complex in preparation process are effectively solved, the purpose of efficient separation and removal of hydrophilic / hydrophobic pollutants in industrial wastewater is achieved, the removal rate is 98% or above, the preparation method is simple, and high application value is achieved.

The invention relates to the field of fiber manufacturing, in particular to a magnetic far-infrared dual-response fiber and a preparation method thereof.The magnetic far-infrared dual-response fiber comprises a polymer matrix and a magnetic far-infrared composite material evenly distributed in the polymer matrix; the magnetic far-infrared composite material comprises a nano ferroferric oxide core body and a zirconium carbide coating layer coating the core body, the interior of the nano ferroferric oxide core is doped with transition metal elements, so that the Curie point temperature of the nano ferroferric oxide core is 40-50 DEG C, and the surface of the nano ferroferric oxide core is modified by a cationic surface active agent to form a positive charge layer; hydroxyl is grafted on the surface of the zirconium carbide material. The Curie temperature of ferroferric oxide is precisely regulated and controlled to range from 40 DEG C to 50 DEG C through transition metal doping, a magnetic-far infrared synergistic energy transfer channel is designed and constructed in combination with a core-shell structure, intelligent response with the far infrared emissivity larger than or equal to 0.90 is achieved under body temperature triggering, and the functional strength and large-scale production feasibility are both achieved.

The invention relates to the technical field of flexible composite materials, in particular to an ultrathin flexible magnetic composite material and a preparation method and application thereof.The ultrathin flexible magnetic composite material comprises a polymer matrix and a composite absorbent, and the composite absorbent comprises samarium-iron-nitrogen magnetic powder subjected to surface treatment through phosphoric acid and a benzotriazole corrosion inhibitor, the core-shell structure complex is formed by ferroferric oxide nanoparticles and reduced graphene oxide through chemical bonding; a hyperbranched polyamide-amine dispersant; the polymer matrix is adopted, thermoplastic polyurethane / polydimethylsiloxane is used as a flexible framework, mechanical support and processing fluidity are provided, the glass transition temperature is lower than 25 DEG C, and it is ensured that the material keeps high flexibility at the room temperature. The soft segment of the thermoplastic polyurethane endows the material with elasticity, and the hard segment forms a physical crosslinking point to balance strength and flexibility; a silicon-oxygen bond structure of polydimethylsiloxane endows the material with low-temperature flexibility and chemical stability, and the material is suitable for sensitive scenes such as medical treatment.

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 relates to a preparation process of a lithium ion composite battery negative electrode material with low impedance and high rate performance. The preparation method comprises the following steps: pretreatment of artificial graphite, preparation of hollow ferroferric oxide nanospheres (H-Fe3O4), preparation of disordered nitrogen-doped carbon-coated hollow ferroferric oxide nanospheres (H-Fe3O4 (at) NC), preparation of carbon-coated artificial graphite (Ag (at) C), preparation of a porous graphite composite material (PG (at) C (at) SEI for rapid charging, preparation of an artificial SEI high-conductivity porous graphite negative electrode material (PG (at) C (at) SEI), and construction of the composite negative electrode material (rGO (at) PG (at) C (at) SEI (at) H-Fe3O4 (at) NC). According to the preparation method, a high-temperature treatment method, a doping combination method, a carbonization combination method and an etching method are creatively combined, the prepared battery negative electrode material shows good impedance high-rate performance, and the charging and discharging efficiency and the cycling stability of a lithium ion battery can be effectively improved.

The invention provides a thermal power plant high-temperature section oxygen-free oxygen adding monitoring system and method, and relates to the technical field of oxygen content monitoring, an error prediction model is constructed according to monitoring errors of oxygen content monitoring equipment at different accumulative flows, and therefore the real oxygen content in feed water is obtained; then oxygen is injected, a magnetic intensity curve of the high-temperature steam pipeline is obtained, the corresponding relation between the thickness of ferroferric oxide and the magnetic intensity is obtained through a laboratory, a pH value curve of discharged steam is obtained, and the oxygen content condition of the steam is judged and regulated; according to the oxygen regulation and control amount and the intensity curve, the modification amount at different accumulative flows is obtained, the monitoring error is modified, the system comprises a water supply oxygen content obtaining module, a rear-end monitoring module, an oxygen content analysis module and a modification module, and smooth generation of the ferroferric oxide oxidation layer is guaranteed in the mode that monitoring is conducted from the front end and the rear end respectively.

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.