15 results about "Triiron Tetraoxide" patented technology

The invention relates to the field of material chemistry on-line detection, in particular to a 1, 2, 4-trichlorobenzene on-line detection material and a preparation method thereof, and provides a film-forming sensitive layer material capable of being coated on the surface of a transducer, and the film-forming sensitive layer material comprises chitosan, a crosslinking component with the content of 0.1-5wt% in terms of glutaraldehyde and magnetic core-shell molecularly imprinted particles after being dried, the magnetic core-shell molecularly imprinted particle contains a ferroferric oxide magnetic inner core, a silicon dioxide middle layer and a molecularly imprinted polymer shell layer, and the shell layer is a cyclodextrin methacrylate and ethylene glycol dimethacrylate copolymer network and takes 1, 2, 4-trichlorobenzene as a template. The material keeps the membrane integrity and long-term stability under the working conditions of circulation and regeneration and also gives consideration to quick response, and the residual 1, 2, 4-trichlorobenzene is controlled to be not greater than 0.10 wt% and the residual glutaraldehyde is controlled to be not greater than 0.5 wt%. The method is used for relieving structural mass transfer contradiction and processing and coating coupling contradiction caused by high filler load, and has online detection application value.

The invention discloses a metal oxide composite sodium ferric sulfate positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of sodium ion battery positive electrode materials. The metal oxide composite sodium ferric sulfate positive electrode material comprises the following raw materials in parts by mass: 1-20 parts of sodium sulfate, 2-40 parts of ferrous sulfate, 0.05-1 part of an antioxidant, 0.05-1 part of a carbon source and 0.01-2 parts of metal oxide, the metal oxide is at least one of ferrous oxide, ferric oxide, ferroferric oxide, manganese oxide, manganese dioxide, cobalt oxide, cobaltosic oxide, cobaltic oxide, vanadium monoxide, vanadium dioxide, vanadium trioxide, vanadium pentoxide, nickel oxide and copper oxide. The invention also discloses a preparation method and application of the metal oxide composite sodium ferric sulfate positive electrode material. The method provided by the invention can solve the problems of low conductivity and specific capacity of the existing sodium ferric sulfate positive electrode material, and has the advantages of low cost, strong process adaptability and wide application prospect.

This invention discloses a carbon-ceramic brake disc and its preparation method, relating to the field of carbon-ceramic brake disc technology. This invention uses plain weave fabric instead of non-woven fabric, increasing the structural strength. Furthermore, the friction layer uses a mesh, solving the defect of easy shedding of non-woven fabric on the friction surface. The mesh fiber content is significantly reduced, increasing the ceramic content on the friction surface, thereby improving the material's wear performance. This invention prepares a wear-resistant magnesium hydroxysilicate, then combines it with porous molybdenum disulfide. By adding ferric chloride and ferric chloride tetrahydrate, the porous molybdenum disulfide-magnesium hydroxysilicate composite is loaded with iron oxide, further improving the strength and wear resistance of the carbon-ceramic brake disc.

The invention provides a method and system for removing total phosphorus and fluoride in stainless steel wastewater, and the method comprises the following steps: carrying out flocculent precipitation treatment on the stainless steel wastewater by using a composite flocculant to obtain a primary treatment liquid; and conveying the primary treatment liquid to an adsorption tower provided with a modified ternary composite filler for adsorption treatment to obtain a secondary treatment liquid. According to the method and the system for removing total phosphorus and fluoride in the stainless steel wastewater provided by the invention, phosphate, fluoride and heavy metal ions in the stainless steel wastewater can be synchronously adsorbed by utilizing the composite flocculant obtained by compounding the polyaluminum sulfate solution and the polyferric sulfate solution; residual total phosphorus and fluoride can be efficiently removed by utilizing the synergistic effect of activated aluminum oxide, graphene and ferroferric oxide in the modified ternary composite filler through a multi-element synergistic mechanism of adsorption, ion exchange and complex reaction.

The present disclosure relates to a mixed carbonized iron phase catalyst and a preparation method thereof. The mixed carbonized iron phase catalyst comprises 41-65 mol% of Fe7C3, 35-57 mol% of χ-Fe5C2 and 0-2 mol% of iron-containing impurities, in terms of total molar content of the mixed carbonized iron phase catalyst; the iron-containing impurities are triiron tetroxide. The catalyst prepared by the method contains Fe7C3 phase and χ-Fe5C2 phase, so that the catalyst has high CO conversion rate and low CH4 and CO2 selectivity; the method for preparing the catalyst of the present disclosure is simple, can produce the catalyst in large quantities, and the prepared catalyst has good activity and stability, and has good application prospect.

The invention discloses a carbon fiber reinforced polyether-ether-ketone composite material and a preparation method thereof, and relates to the technical field of high polymer materials. When the carbon fiber reinforced polyether-ether-ketone composite material is prepared, firstly, a diamino monomer reacts with 3, 3 ', 4, 4'-benzophenone tetracarboxylic dianhydride to prepare a water-based ultraviolet absorption sizing agent; growing a metal organic framework on the activated carbon fibers in situ to prepare modified carbon fibers; the preparation method comprises the following steps: filling ferroferric oxide into carboxylated carbon nanotubes, and reacting with KH-550 to obtain modified carbon nanotubes; dispersing a water-based ultraviolet absorption sizing agent and modified carbon nanotubes in water, and soaking the modified carbon fibers in the water-based ultraviolet absorption sizing agent to obtain sized carbon fibers; and alternately laying the polyether-ether-ketone powder and the sizing carbon fibers, and carrying out hot press molding to prepare the carbon fiber reinforced polyether-ether-ketone composite material. The carbon fiber reinforced polyether-ether-ketone composite material prepared by the invention has the advantages of high bending strength, high interfacial shear strength, aging resistance and strong electromagnetic shielding performance.

The invention belongs to the technical field of inorganic new materials, and provides iron phosphate and a preparation method and application thereof.The preparation method of the iron phosphate comprises the following steps that ferroferric oxide and a phosphorus source compound are added into distilled water, a compound additive is added after the temperature is increased, the mixture is stirred to react, and a ferrous dihydrogen phosphate solution is obtained; the compound additive is a mixture of an iron-containing reaction additive and a reducing agent, the addition amount of the compound additive is 0.5-2 times of the molar weight of the ferroferric oxide, and the addition amount of the iron-containing reaction additive is 10-50% of the molar weight of the ferroferric oxide; adding an oxidizing agent into the ferrous dihydrogen phosphate solution, stirring, heating and reacting to obtain an iron phosphate crude product; and roasting the iron phosphate crude product at 450-750 DEG C to obtain the iron phosphate. The preparation method can improve the yield of the iron phosphate, reduce the content of impurity ions and improve the tap density of the iron phosphate, and the iron-containing reaction aid and the reducing agent are mixed to serve as the compound aid, so that the cost can be greatly reduced, the income can be improved, and the preparation method is suitable for large-scale production.

This invention discloses a microwave-absorbing and heating coating for metal cookware used in microwave ovens and its preparation method. The microwave-absorbing and heating coating is prepared from layered Mxenes powder, magnetic iron tetroxide powder or γ-iron oxide powder, tungsten carbide powder, polyvinylidene fluoride powder, aluminosilicate powder, and a high-temperature resistant glass adhesive. This invention uses the microwave-absorbing and heating coating material as a heat source, utilizing the heat generated by the absorbing material under microwave action, which can solve the problem that metal cookware cannot heat the food inside the cavity in a microwave oven.

This invention discloses a method for preparing a carbon-coated iron tetroxide (Fe3O4) oxygen reduction catalyst: An organic compound and a metal salt are stirred and heated under sealed conditions, and then vacuum dried to obtain a eutectic solvent; the eutectic solvent is calcined at low temperature in an inert gas atmosphere, and the resulting solid is ground, washed, and dried to obtain an intermediate; the intermediate is then subjected to a second high-temperature calcination in an inert gas atmosphere to obtain the final product. The carbon-coated iron tetroxide catalyst prepared by this invention exhibits good activity and selectivity for the electrocatalytic oxygen reduction to hydrogen peroxide production, and also possesses excellent stability. This method has a simple preparation process, low equipment requirements, high controllability, and reduces production costs.

This invention discloses a magnetically detectable nitrile glove and its preparation method, relating to the field of nitrile glove manufacturing technology. The raw materials include: carboxylated nitrile latex, modified magnetite magnetic particles, modified porous zein breathable microspheres, modified core-shell polysiloxane colored microspheres, sulfur, vulcanization accelerator, potassium hydroxide, and tributyl acetylacetate. In this invention, modified porous zein breathable microspheres are added, which can form stable breathable channels in the glove film, improving the glove's water vapor permeability and air permeability, solving the problems of stuffiness and poor breathability of ordinary nitrile gloves. Simultaneously, the modified microspheres form a hydrophobic protective and ionic bond anchoring layer on their surface, preventing clogging of their own pores and agglomeration with magnetic particles, and firmly bonding with the nitrile latex without detachment or exudation. While significantly improving breathability, this method maximizes the preservation of the glove's tensile strength, tear resistance, and other mechanical properties.

The invention discloses a magnetic ZIF derived carbon composite material as well as a preparation method and application thereof, and belongs to the technical field of catalytic materials. The preparation method comprises the following steps: mixing an iron source, a zinc source and 2-methylimidazole in a solvent, so that the molar ratio of the iron element to the zinc element to the 2-methylimidazole is (1-2): (0-1): (10-14) to obtain a mixture; standing and aging the mixture for 48-72 hours, and filtering a solid product to obtain a precursor; and placing the precursor in an inert atmosphere, and heating at 900-1100 DEG C for 2-3 hours to obtain the magnetic ZIF derived carbon composite material. The obtained magnetic ZIF derived carbon composite material has a porous carbon skeleton, and the porous carbon skeleton is uniformly loaded with an iron-based active component; the iron-based active component comprises zero-valent iron and ferroferric oxide, can be used for catalytic degradation of tetracycline, and can realize rapid separation under an external magnetic field.

This invention discloses an iron / carbon composite material, its preparation method, and its application in the hydrogenolysis reaction of 5-HMF. The iron / carbon composite material includes a carbon matrix and iron(III) oxide dispersed on the carbon matrix. The particle size of the iron(III) oxide is 10-50 nm, and the mass fraction of iron(III) oxide in the iron / carbon composite material is 8 wt%-20 wt%. The application in the hydrogenolysis reaction includes the following steps: (1) Pre-reduction process: The iron / carbon composite material is used as a catalyst, placed in a quartz tube, and a mixture of hydrogen and nitrogen is introduced. The mixture is then calcined at 400-600 °C; (2) A 5-HMF solution is pumped in using a syringe, hydrogen is introduced, and a hydrogenation reaction is carried out under normal pressure. The product is then collected. The iron / carbon composite material of this invention is used as a catalyst. The hydrogenolysis reaction is carried out under normal pressure. The 5-MF selectivity is high, the catalyst stability is good, and the catalyst is magnetic, making it easy to separate and recover.

The invention discloses a preparation method of a foamy carbon composite wave-absorbing material and the foamy carbon composite wave-absorbing material. The preparation method comprises the following steps: immersing foamed nickel into a polyacrylonitrile solution to obtain a first composite body, and carrying out pre-oxidation treatment on the first composite body to obtain a pre-oxidation product. And carbonizing the pre-oxidized product to obtain a carbonized product. And etching the carbonized product by adopting an acid solution to obtain foamy carbon. And carrying out acid activation treatment on the foamy carbon to obtain activated foamy carbon. Preparing a first mixed solution containing cobalt salt, ferric salt and urea, immersing the activated foamy carbon into the first mixed solution, and carrying out hydrothermal reaction to obtain the foamy carbon loaded with the Co-Fe precursor. And carrying out heat treatment on the foamy carbon loaded with the Co-Fe precursor to obtain the foamy carbon composite wave-absorbing material. The magnetic loss of the ferroferric cobalt oxide and the dielectric loss of the foamy carbon cooperate with each other, so that the dielectric constant and the magnetic conductivity of the foamy carbon composite wave-absorbing material can be adjusted, impedance mismatch is improved, and the absorption effect of electromagnetic waves is improved.

This invention relates to the field of online detection in materials chemistry, specifically an online detection material for 1,2,4-trichlorobenzene and its preparation method. It provides a film-forming sensitive layer material that can be coated onto the surface of a transducer. After drying, it comprises chitosan, a crosslinking component (calculated as 0.1–5 wt% of glutaraldehyde), and magnetic core-shell molecularly imprinted particles. The magnetic core-shell molecularly imprinted particles contain a magnetite magnetic core, a silica intermediate layer, and a molecularly imprinted polymer shell. The shell is a copolymer network of cyclodextrin methacrylate and ethylene glycol dimethacrylate, using 1,2,4-trichlorobenzene as a template. The material maintains membrane integrity and long-term stability while ensuring rapid response under circulation and regeneration conditions, and controls residual 1,2,4-trichlorobenzene to no more than 0.10 wt% and residual glutaraldehyde to no more than 0.5 wt%. This material alleviates structural mass transfer contradictions and the coupling contradiction between processing and coating caused by high filler loading, and has value for online detection applications.

This invention discloses a silver nanorod@mesoporous iron(III) oxide composite heterogeneous hydrogel material with bone-promoting and intelligent anti-infection functions, its preparation method, and its application. Specifically: 1) AgNRs are prepared, and a MesoFe3O4 shell is constructed on their surface using a template method to obtain AgNRs@MesoFe3O4; 2) Antibacterial agents are loaded into AgNRs@MesoFe3O4 using cyclic ultrasonic impregnation-low-temperature vacuum drying; 3) A sodium alginate solution containing drug-loaded AgNRs@MesoFe3O4 is poured into the bottom layer of a mold to obtain a nanomaterial layer, and a mixed solution containing AlgMA and sodium alginate is poured into the top layer; 4) UV curing and Ca2+ curing are performed. 2+ The solution impregnation method achieves dual in-situ gelation of the above solution. The solution is impregnated in a solution containing osteogenic drugs, rinsed, dried, and sterilized by irradiation to obtain a heterogeneous hydrogel. This material disrupts biofilms and kills bacteria, exhibiting both antibacterial and osteogenic functions.