74results about How to "Strong magnetic" patented technology

The present invention is composite nano silica/ferroferric oxide grain material and its preparation process. By means of chemical deposition process, nano ferroferric oxide crystal produced in the reaction is compounded and assembled onto the surface of spherical nano silica particle to form the composite grain material in spherical shell shape. The present invention features that through coating silica with nano ferroferric oxide, the features of both the silica and the nano ferroferric oxide are combined together to make the composite material possess light weight, magnetism and low radiance. The composite material may be used in making transparent pigment, stealth material, etc.

A method of preparing a magnetic ZnFe<2>O4/g-C3N4 composite photocatalytic material is disclosed. The method prepares the composite photocatalytic material through a process combining sol gel and calcination. The method includes dissolving Zn(NO3)<2>.6H2O and Fe(NO3)<3>.9H2O into a proper amount of a mixed solution of polyethylene glycol 400 and water, putting into a water bath, stirring for a certain period of time, adding citric acid, putting into a water bath, reacting, adding melamine into the prepared precursor, continuously stirring to form gel, and performing calcination in a muffle furnace to obtain the composite photocatalytic material having high catalytic activity. The method overcomes disadvantages that the photocatalytic efficiency is low and recoverability is poor of a novel semiconductor material g-C3N4. A process of preparing the composite photocatalytic material has advantages of simple and convenient procedures, a high efficiency and easy operation, and avoids generation of waste water and waste residues. The composite photocatalytic material can replace TiO2, ZnO, and other traditional photocatalysts and be applied to photocatalytic purification of organic waste water pollution and air pollution.

The invention discloses preparation and application of a floatable magnetic hollow material for removing heavy metal in water and soil. Agricultural wastes of musaceae, such as banana, dried-up leaves, corn dried-up leaves and rice husks are combined with alginate to prepare the floatable magnetic hollow material containing nanometer ferroferric oxide and nanometer ferrous chloride, and the floatable magnetic hollow material is applied to remove the heavy metal in the water and the soil, so that not only is the resource utilization of the agricultural wastes developed, and a new way is opened for farmer income increase, but also the prepared nanometer ferrous chloride and nanometer ferroferric oxide and a high-quality porous biological carbon material have a high-efficient heavy metal adsorption capability, the hollow material with magnetism and floated on a water surface can be conveniently recovered, and the heavy metal in the water and the soil is removed. The floatable magnetic hollow material provided by the invention is wide in application range, can be used for renovating the water with heavy metal pollution such as urban or industrial sewage, rivers, pools and lakes, and can be also used for renovating the soil with heavy metal pollution such as rice fields, water vegetable fields and green plant fields.

A reconfigurable electric motor includes a rotor containing rotatable permanent magnets or non-magnetically conducting shunting pieces. The magnets and/or shunting pieces have a first position producing a weak magnetic field for asynchronous induction motor operation at startup and a second position producing a strong magnetic field for efficient synchronous operation. The motor includes a squirrel cage for induction motor operation at startup with the permanent magnets and/or shunting pieces positioned to product the weak magnetic field to not interfere with the startup. When the motor approaches or reaches synchronous RPM, the permanent magnets and/or shunting pieces rotate to produce a strong magnetic field for high efficiency synchronous operation. The position of the magnets and/or shunting pieces may be controlled by a centrifugal mechanism, or viscous damping may delay rotation of the magnets and/or shunting pieces, or electrically controlled apparatus may control positions of the magnets and/or shunting piece.

The invention belongs to the technical field of composite materials and relates to a preparation method and application of a core-shell P-CoFe2O4(at)GCN photocatalyst. The preparation method comprisesthe following steps: firstly mixing cobalt salt and ferric salt, dropwise adding alkali lye and precipitating to prepare strongly magnetic nanoparticles CoFe2O4; fully dispersing a graphite-type carbonitride precursor and a phosphorus source in distilled water, carrying out solid-liquid separation, drying a solid at 80-100 DEG C for 12-24 h, and grinding to obtain a powder; and finally placing the powder into a muffle furnace, and heating in the air atmosphere at 500-600 DEG C for 2-5 h so as to obtain the photocatalyst. In the invention, the prepared material is also applied to wastewater soas to remove antibiotics. By compound modification of the graphite-type carbonitride, the photocatalytic performance is greatly improved, and the solid-liquid separation problems are solved. The preparation method is simple to operate, and the sources of the raw materials are wide. The surface of the prepared material has a pore structure, and the specific surface area is increased, thus providing more active sites for a photo-catalytic reaction. The result shows that the tetracycline photocatalytic degradation rate of the product is 3.66 times higher than the tetracycline photocatalytic degradation rate of pure graphite-type carbonitride before modification.

The invention belongs to the technical field of biomass resource recycling and new environmental functional materials, discloses a magnetic ferromanganese oxide-loaded mesoporous cellulose biochar composite, a preparation method thereof and application of the mesoporous cellulose biochar composite in environmental governance and remediation, and is particularly applicable to the field of adsorption of anionic pollutants. The preparation method comprises preparing mesoporous cellulose biochar, compositing MnFe2O4 in one step according to a solvothermal method, and loading the MnFe2O4 onto the mesoporous cellulose biochar to obtain the magnetic ferromanganese oxide-loaded mesoporous cellulose biochar composite. The mesoporous cellulose biochar composite prepared according to the method has the characteristics of strong magnetism, capability of being charged positively under acidic conditions, high dispersion stability, high adsorptive property and the like, can be widely applied to the field of environmental governance and remediation, is particularly applicable to pollution remediation of the anionic pollutants, such as adsorption of heavy metal and organophosphorus pesticides, andhas the glyphosate adsorption capacity as high as 167.2mg/g.

An eccentric oscillation-type gear device (1) comprising: eccentric sections (10a, 10b); oscillating gears (14, 16); an outer tube (2) having an internal gear pin (3) that engages with the outer teeth (14a, 16a) of the oscillating gears (14, 16); a carrier (4); and an oil seal cap (30). A closed space (S) housing the oscillating gears (14, 16) is formed by the carrier (4) and the outer tube (2). A penetration hole (4d) and a crank shaft attachment hole (4e) that connect to the closed space (S) are formed in the carrier (4). The oil seal cap (30) is arranged on the penetration hole (4d) and the crank shaft attachment hole (4e), and has strong magnetism so as to be capable of attaching metal powder.

The invention discloses a method for preparing a Fe/C composite material of a porous structure by using sedimentary siderite .The method is characterized in that the Fe/C composite material is obtained by using the low-grade sedimentary siderite and biomass powder as raw materials, performing mixing and forming and then performing pyrolysis and reduction reaction at the temperature of 650-900 DEG C under a reducing atmosphere, and the main phase of the material is biomass charcoal and zero-valent iron .The Fe/C composite material of the porous structure has high open porosity, high magnetic susceptibility, high adsorption and high biochemical activity, is a cheap biological carrier material having biological activity and adsorption performance, has a great application prospect in slightly polluted water purification and is especially suitable for simultaneous denitrification treatment of an eutrophic water body.

The invention provides a magnetic nickel-cobalt oxide supported gold catalyst, a preparation method and application thereof, and a preparation method of 2, 5-furandicarboxylic acid, and belongs to the technical field of catalysts. The magnetic nickel-cobalt oxide supported gold catalyst provided by the invention comprises a magnetic nickel-cobalt oxide carrier and gold nanoparticles supported on the magnetic nickel-cobalt oxide carrier, wherein the chemical composition of the magnetic nickel-cobalt oxide carrier is CoNixOy, x ranges from 1 to 5, and y is the number of oxygen atoms meeting the requirement that the valence state of CoNixOy is zero. The magnetic nickel-cobalt oxide supported gold catalyst provided by the invention has high catalytic activity on preparation of 2, 5-furandicarboxylic acid by oxidation of 5-hydroxymethylfurfural, has high selectivity on a target product 2, 5-furandicarboxylic acid, has good stability, can realize separation of the catalyst and the product through a simple and convenient physical magnetic separation mode, and the catalyst is high in repeated utilization rate and is an efficient, specific, green and environment-friendly catalyst.

The invention discloses a multiferroic Bi0.83Pr0.15Sr0.02Fe0.97-xMn0.03CuxO3-CuFe2O4 composite film and a preparation method thereof. The composite film comprises a Bi0.83Pr0.15Sr0.02Fe0.97-xMn0.03CuxO3 (x=0.01-0.05) crystalline film in the upper layer and a CuFe2O4 crystalline film in the lower layer. The preparation method comprises respectively preparing a Bi0.83Pr0.15Sr0.02Fe0.97-xMn0.03CuxO3 precursor solution and a CuFe2O4 precursor solution, carrying out spin-coating on a substrate with multiple CuFe2O4 films and carrying out spin-coating on the CuFe2O4 film with multiple Bi0.83Pr0.15Sr0.02Fe0.97-xMn0.03CuxO3 films to obtain the multiferroic Bi0.83Pr0.15Sr0.02Fe0.97-xMn0.03CuxO3-CuFe2O4 composite film. The preparation method has simple equipment requirements, can prepare the film with good uniformity, easily controls a doping amount, improves ferroelectric and ferromagnetic properties of the film and effectively reduces film leakage current density.

The invention relates to a piezoelectric energy harvester applied to pipeline fluid monitoring, and belongs to the fields of new energy and piezoelectric power generation. Impellers are positioned onthe inner wall, which passes through one end of a shaft, of a pipeline, and are positioned in the center of the pipeline; strip-shaped permanent magnets are arranged at the other end of the shaft, andare positioned on the outer wall of the pipeline; the shaft is supported by a bearing and a bearing pedestal and vertically mounted above the pipeline; each piezoelectric vibrator consists of a metalsubstrate, a piezoelectric sheet and the strip-shaped permanent magnets in a gluing manner; one end of the metal substrate is connected with the interior of the metal shell, the free end is connectedwith the permanent magnets, and the surface is glued with the piezoelectric sheet; and a circuit board is just mounted in the center of the interior of the shell, and the shell is mounted on the upper part of the pipeline. The piezoelectric energy harvester has the characteristics and advantages as follows: the stable piezoelectric energy harvester is formed by interaction force between the permanent magnets; and the piezoelectric energy harvester is simple in structure and process, low in cost, free of accelerated speed sudden change, high in vibration stability, high in power generation capability and high in reliability, and capable of improving electric energy production by increasing the number and prolonging the piezoelectric vibrators.

The invention discloses a magnetic renewable adsorbent for adsorbing gaseous zero-valent mercury and a preparation method of the magnetic renewable adsorbent, and belongs to the technical field of mercury adsorption. The adsorbent is formed by performing phosphomolybdic acid (HPMo) grafting on magnetite (Fe3O4) in a preparation process to form HPMo@Fe3O4, then performing high-temperature calcination to obtain MoO3@gamma-Fe2O3, and finally performing vulcanization modification. The phase change of maghemite is inhibited by a means of phosphomolybdic acid grafting, so as to improve the thermal stability of maghemite, and the magnetic property of maghemite is improved; meanwhile, the zero-valent mercury adsorption capacity of the phosphomolybdic acid grafted maghemite is improved by controlling the vulcanization effect of the surface of the phosphomolybdic acid grafted maghemite, the magnetic adsorbent which has excellent low-temperature zero-valent mercury adsorption capacity and can berecycled is prepared, and the magnetic adsorbent can be suitable for being combined with a wet-type electric precipitator to control mercury pollution of a coal-fired power plant in a centralized mode.

The present invention discloses a preparation method of nano magnetic chitosan immobilized enzyme. Said method includes the following steps: making nano magnetic chitosan particles whose surface contains acylchloro functional group be dispersed in enzyme-bearing solution, stirring them to make reaction for 2-8 hr at 20-25 deg.C, making solid-liquid separation in magnetic field, using phosphoric acid buffer solution to wash the magnetic precipitate for three times so as to obtain the required nano magnetic chitosan immobilized enzyme, the concentration of enzyme in enzyme-bearing solution is 0.01-0.1%. and the solid-liquid ratio of nano magnetic chitosan whose surface contains acylchloro functional group and enzyme-bearing solution is 1:50-1:200 g/ml.

The invention relates to a material for purifying arsenate and chromate in drinking water and a preparation method and application thereof. The material is characterized in that: the material is sulfide of iron, manganese or zinc; the content of the sulfide in the material is not less than 50 weight percent; the content of arsenic is not more than 0.5 weight percent; and the concentration of the arsenate and the chromate in the drinking water is between 0.01 and 5 mg/L. The material for purifying the drinking water has the advantages of wide sources of raw materials, low cost and high adsorption activity, and capacity of being repeatedly used.

The invention discloses a charged magnetic hydrophobic material and a preparation method and application thereof in separation of micro-fine-particle minerals. The material includes magnetic particlesand a metal organic complex loaded on the surface, has strong magnetism, is positively charged on the surface, and has high electrostatic adsorption capacity for anions and high physical adsorption performance for hydrophobic micro-fine-particle minerals, and therefore, after micro-fine-particle minerals in ore pulp are subjected to surface hydrophobic and anion modification, the micro-fine-particle minerals can be adsorbed and agglomerated by utilizing the material, then the micro-fine-particle minerals are efficiently separated from gangue minerals through magnetic separation, thus solvinga difficult problem of separation and purification of ultrafine minerals. A preparation process of the charged magnetic hydrophobic material is simple and cheap and meets industrial production requirements.

The invention belongs to the technical fields of sewage purification and wastewater recycling, and discloses a novel CoFe2O4/CNFs cathode catalytic membrane coupling microbial fuel cell two-stage tandem system and an application thereof. The system is used to treat non-degradable practical coking wastewater. High-efficiency treatment of the coking wastewater is realized through cooperating the oxidation effect of anode chamber microbes on organic matters, the catalysis effect of a CoFe2O4/CNFs catalytic membrane and membrane filtration. The system uses the good stability and excellent pollution resistance of the CoFe2O4/CNFs composite membrane having high ORR activity, and has the advantages of good running stability, improvement of the quality of outlet water, realization of standard-reaching discharging of the coking wastewater, facilitation of development of amplified and pilot scale test experiments, and promotion of the industrialization of the accomplishment when applied to the two-stage tandem continuous treatment of the high-concentration coking wastewater.

The invention relates to a preparation method of a magnetic graphene ternary composite material based on click chemistry. The preparation method comprises the following steps: adding 1.0-5.0 g of trivalent ferric salt to 10-50 ml of reactive solvent, and carrying out ultrasonic dispersion until a solution is clear; then adding 1.0-5.0 g of a stabilizer, carrying out ultrasonic dispersion for 0.1-0.5 h at the temperature of 50-60 DEG C, then adding 0.2-1.0 g of strong alkaline reagent and 5-20.0 mL of amine functional reagent, and carrying out ultrasonic dispersion until the solution is clear; adding 50-100 mg of graphene, carrying out ultrasonic dispersion for 0.3-1 h at the temperature of 50-60 DEG C, and then adding the mixed solution in a polytetrafluoroethylene high-pressure autoclave for reacting for 4-10 h; cooling to room temperature, carrying out magnetic separation, washing with ultrapure water for several times until the pH is 7.0, then washing with ethyl alcohol for several times, and drying to obtain the amino-modified magnetic graphene ternary composite material. The preparation method is simple in technology, controllable in functional group proportion, high in repeatability and the like, the prepared amino-modified magnetic graphene ternary composite material has the advantages of high magnetism, multiple functions and the like, and the prepared amino-modified magnetic graphene ternary composite material is relatively higher in application value and wide in application prospect.

The invention discloses a method for comprehensively recycling sodium, aluminum and iron from red mud. The red mud is mixed with an additive to obtain a raw material, the mixed raw material is subjected to calcination to obtain clinker, the clinker is added to an alkaline adjustment liquid for leaching, slid-liquid separation is performed, and leachate containing aluminum and sodium and magnetic leaching residues are obtained; the additive is a mixed additive composed of a calcium-series additive, a magnesium-series additive and a sodium-series additive. According to the technical scheme, no reducing agent needs to be added, hematite or hematite is converted as magnesioferrite with high magnetism through the magnesium-series additive and enters the leaching residues, and then an iron ore concentrate product is obtained through magnetic separating. In the technical scheme, the atmosphere control process and generation of a great quantity of polluting atmosphere in the current iron recycling process are avoided. In the method, the aluminum recycling rate is 85%, the sodium recycling rate is 92% or above, the sodium content in final residues is lowered to 1% or below, the iron grade of the iron ore concentrate is 50-55%, and the recycling rate is about 70%.