455 results about "Iron nanoparticle" patented technology

A method for preparing highly stabilized and dispersible zero valent iron nanoparticles and using the nanoparticles as a remediation technology against inorganic chemical toxins in contaminated sites. The method employs a composition containing select polysaccharides (starch or cellulose) as a stabilizer for the iron nanoparticles in a liquid carrier, and results in suspensions of iron nanoparticles of desired size and mobility in water, brine, soils or sediments. The stabilizer facilitates controlling the dispersibility of the iron nanoparticles in the liquid carrier. An effective amount of the composition is delivered to a contaminated site so that the zero valent iron nanoparticles can remediate one or more toxins such as an arsenate, a nitrate, a chromate, or a perchlorate in the contaminated site.

Thermosensitive liposomes encapsulating paramagnetic iron oxide nanoparticles are used as a drug controlled release system. Paramagnetic iron oxide nanoparticles are used to generate heat by applying alternative magnetic field to cause leakage of drugs in the liposomes.

The invention provides superparamagnetic nano Fe3O4 particles synthesized through in-situ induction of chitosan hydrogels, relating to a method for synthesizing the superparamagnetic nano Fe3O4 particles. The invention solves the problems of serious aggregation of the nano Fe3O4 particles and the complicated method for inducing the chitosan into the surface of the Fe3O4 in the current nano Fe3O4 particles. The method of the invention is that: 1. the chitosan powder is added into dilute acid solution; 2. cross-linking agent is added to make the chitosan hydrogels; 3. the chitosan hydrogels are sequentially dipped in Fe3+ aqueous solution, water, Fe2+ aqueous solution and water, and a plurality of times of circular leaching are made so as to form the chitosan hydrogels that contains iron ions; 4. then basification treatment is carried out; 5. the hydrogels is dissolved or degraded again, and finally the black superparamagnetic Fe3O4 nano particles are obtained upon centrifugalization. The method of the invention requires simple technique and mild conditions and the equipment used in the method is simple and can be obtained easily, thereby mass production can be achieved. The average diameter of the particles is 15 to 25nm, and the particles distribute evenly with superparamagnetism.

The invention relates to a nanometer zero-valent ion composite material and a preparation method thereof. The preparation method comprises the steps that corn straw biochar is prepared, modified by being soaked with nitric acid, washed to be neutral and then dried for use; FeSO4.7H2O is reduced into zero-valent iron in a nitrogen environment through a liquid phase reduction method, and the zero-valent iron is loaded on the biochar; solid-liquid separation is conducted on the solution obtained after reacting, and the biochar-loaded nanometer zero-valent ion composite material is obtained. The material is used for removing lead in underground water, the agglomeration and activity reduction problems of iron nanoparticles in the using process are solved, secondary contamination cannot be generated in repair practice, a removal experiment of the lead in the underground water is simulated in a constructed organic glass simulation reaction column, and the removal rate can reach 90% or above.

The invention discloses a mesoporous silicon dioxide microsphere-loaded zero-valent iron nanoparticle and a preparation method thereof. The mesoporous silicon dioxide microsphere-loaded zero-valent iron nanoparticle has a structure as follows: the center is mesoporous SiO2, the middle layer is FeOOH, the surface of the outermost layer is coated with FeO, and ultimately a SiO2@ FeOOH@Fe structure, namely a spherical particle, is formed. The preparation method is easy to operate and mild in reaction conditions, can be carried out at room temperature and normal pressure, and is short in time consumption and low in energy consumption; the prepared mesoporous silicon dioxide microsphere-loaded zero-valent iron nanoparticles have the particle size of 400-500nm and are spherical particles; the specific surface areas of the prepared mesoporous silicon dioxide microsphere-loaded zero-valent iron nanoparticles are detected to be 383.477m2/g by a BET-N2 specific surface area analysis method; and the prepared mesoporous silicon dioxide microsphere-loaded zero-valent iron nanoparticles are good in lattice morphology, good in fluidity and good in dispersion and can be used for decomposing organic pollutants in the environment.

Disclosed is a process, which is used to eliminate heavy metal cations from the aqueous media, and provides a better solution for the existing problems of the separation systems like low efficiency and high costs. The heavy metal cations selected for this purpose are cadmium, lead and copper. The separation system consists of a two stage process: In the first stage, the iron oxide nanoparticles are suspended in an aqueous medium contaminated with the heavy metal cations. In the second stage, the solution is brought into contact with a ferromagnetic matrix (or a paramagnetic matrix) magnetized by the application of an outside magnetic field. The heavy metal cations are deposited on the matrix under the imposed magnetic field. This two-stage process makes it possible to separate the heavy metal cations from the aqueous medium. The wire matrices are upon the completion of separation washed away by water or air current.

A graphene-iron oxide complex consists of graphene and needle-like iron oxide nanoparticles grown on a surface of the graphene, and a fabricating method thereof includes (A) preparing a reduced graphene dispersed solution, (B) mixing the dispersed solution with a solution containing iron oxide precursors to prepare a mixture, (C) stirring the mixture to prepare a graphene-iron oxide dispersed solution containing the graphene-iron oxide complex that needle-like iron oxide nanoparticles are grown on the surface of the graphene, and (D) separating the graphene-iron oxide complex from the graphene-iron oxide complex dispersed solution.

The invention discloses a preparation method of an electro-Fenton cathode material based on carbon felt-supported iron nanoparticles and application of the electro-Fenton cathode material in the degradation of organic pollutants in water, and belongs to the technical field of preparation of electro-Fenton cathode materials and electro-Fenton water treatment. The preparation method and the electro-Fenton cathode material are characterized in that polyaniline is supported on a pure carbon felt through electrochemical deposition, iron particles are supported to obtain an iron carbon-doped porouscomposite carbon fiber material; a carbon felt acting as a cathode material can be applied to an electro-Fenton water treatment apparatus, air is charged in, and therefore, hydroxyl radicals are generated by catalysis at a cathode, and organic pollutants in water can be degraded. With the characteristic fully utilized that a carbon fiber has large specific surface area, the preparation method herein has the advantages of high treatment efficiency and greenness and the like, and has economic and social benefits for the field of treatment of industrial printing and dyeing waster and groundwater.

The invention discloses a preparation method of dispersed iron nanoparticles and relates to a preparation method of a metal nanomaterial. The method comprises the following steps of: preparing a solution by using a soluble divalent ferric salt or tervalent ferric salt serving as a raw material and distilled water or a mixed solution of distilled water and ethanol; adding a surfactant and a complexing agent; adding a dispersant; dropwise adding a prepared hydroboron aqueous solution in a stirring state; dropwise adding the prepared hydroboron aqueous solution at room temperature till fully reacting; performing suction filtration on the obtained reaction product; and washing with distilled water and absolute ethyl alcohol, and drying to obtain black dispersed iron nanoparticles. The produced iron nanoparticles have the advantages of small particle diameter, uniformity in dispersion, narrow particle diameter range, simple process, low cost and contribution to further expansion of the production scale.

The invention belongs to the technical field of transition metal oxide-carbon aerogel, and particularly discloses an iron oxide nano-particle/graphene-polyimide-based carbon aerogel composite material and a preparation method thereof. The composite material is formed by evenly loading iron oxide nano-particles on graphene-polyimide-based carbon aerogel. The method comprises the following preparation step: carrying out in-situ growth of the iron oxide nano-particles on the graphene-polyimide-based carbon aerogel activated by potassium hydroxide through a one-step solvothermal method. The method disclosed by the invention is free of use of a toxic reagent, namely formaldehyde; and the prepared iron oxide nano-particle/graphene-polyimide-based carbon aerogel composite material has the advantages of small iron oxide nano-particles, uniform distribution, high porosity, high specific surface area, high conductivity, stable physical and chemical properties and the like, and can be used for preparing a high-sensitivity biosensor, a high-performance adsorption material and ideal electrode materials for new energy devices of a super capacitor, a lithium-ion battery and the like.

The invention discloses an iron diselenide/sulfur-doped graphene anode composite material for a sodium-ion battery and a preparation method of the iron diselenide/sulfur-doped graphene anode composite material. The preparation method comprises the following steps: dissolving a sulfur source, a selenium-containing inorganic matter, an iron-containing inorganic salt and citric acid or sodium citrate into a graphene oxide solution; dropwise adding hydrazine hydrate to form a light black solution, adding the light black solution to a hydrothermal reaction kettle for reaction, and naturally cooling the product after the reaction is ended; and carrying out repeated washing, suction filtration and drying on a reaction sediment with distilled water and absolute ethyl alcohol, so as to obtain the iron diselenide/sulfur-doped graphene composite material. According to the iron diselenide/sulfur-doped graphene composite material prepared by the method, iron diselenide nano-particles are evenly distributed on the surface of the sulfur-doped graphene and the iron diselenide/sulfur-doped graphene composite material has excellent electrochemical properties as a sodium-ion battery anode material. The iron diselenide/sulfur-doped graphene anode composite material is prepared by a simple hydrothermal process; synchronous sulfur doping, graphene oxide reduction and graphene oxide and iron diselenide recombination can be achieved; and the iron diselenide/sulfur-doped graphene anode composite material is simple in preparation technology and low in cost, and has a wide industrial application prospect.

The invention relates to a preparation method of a graphene-supported iron oxide nanoparticle composite wave-absorbing agent, comprising: (1) preparing composite precursor powder by a spray process, to be specific, using iron nitrate nonahydrate as an iron source, anhydrous glucose as a carbon source and sodium chloride as a template with a molar ratio of Fe, C and NaCl being (0.75-2):30:100, dissolving the iron source, the carbon source and the sodium chloride in deionized water, magnetically stirring to obtain aa homogenous mixed solution, and subjecting the solution mixed well to spray drying to obtain precursor powder; reducing the composite precursor powder by calcining; oxidizing the composite precursor powder by calcining; removing the NaCl template. The graphene-supported iron oxide nanoparticle composite prepared by using the preparation method is applied to electromagnetic wave absorption.

The present invention relates to a method of preparing biocompatible iron oxide nanoparticles by coating iron oxide nanoparticles having improved magnetism via annealing treatment using salt particles with a hydrophilic material and to a magnetic resonance imaging (MRI) contrast agent including the iron oxide nanoparticles prepared thereby. Among hydrophilic materials, carboxymethyl dextran (CM-dextran) is the most efficient in terms of stabilizing the annealed iron oxide nanoparticles and exhibiting contrast effects.

The invention discloses a preparation method of spherical ferriferrous oxide nano particles with controllable size, which is characterized in that sodium oleate is taken as a synthesis auxiliary agent and a surfactant, a hydrothermal method is used for one-step preparation in a glycol system. The method comprises the following steps: dissolving soluble ferric salt and a certain amount of sodium oleate in glycol, stirring for more than 2 hours; then sealing the mixed liquor in a polytetrafluoroethylene lined high-pressure reaction vessel, cooling and then centrifuging and washing to obtain the spherical ferriferrous oxide nano particles. According to the invention, the technology is more reliable and has the advantage of high repeatability, only sodium oleate used in a system is taken as a reaction auxiliary agent, and the particle size of the spherical ferriferrous oxide can be regulated and controlled by adjusting the addition of sodium oleate. The prepared ferriferrous oxide has a grading structure, the process is easily controlled and realized, and the preparation method has the advantage of friendly environment. The prepared spherical particles of ferriferrous oxide can be used as a lithium ion battery cathode material, the experiment shows that the spherical particles have excellent cycle performance and good application prospect.

The invention provides a preparation method and an application of a carbon-iron composite material with a porous structure. The material can be used as an adsorbent of various antibiotics and a Fentonreaction catalyst under a wide pH condition. According to the material, a metal organic framework is used as a raw material, a one-step pyrolysis method is adopted, annealing conditions are controlled for synthesis, and iron nanoparticles in the obtained material are uniformly loaded on the surface of an ultrathin carbon nanosheet with a porous structure. The porous structure can effectively enhance the transmission and capture capacity of substances, and meanwhile, THE iron nanoparticles loaded on the porous carbon nanosheet can be complexed with antibiotic molecules through sites on the surface of transition metal, so that the adsorption efficiency is further improved, and the material has better adsorption performance than common activated carbon. In addition, the iron nanoparticles are also active sites of the Fenton reaction and can adsorb pollutants in a circulating mode. Meanwhile, the material has magnetism and can be quickly and conveniently recycled from a water phase. Therefore, the material is a green, efficient and recyclable adsorbent.

The invention relates to an iron-carbon nano composite electromagnetic wave absorption material and a preparation method thereof. Carbonyl iron, methane and acetylene serving as main raw materials are directly synthesized into the iron-carbon nano composite material in a gas-phase reaction device at the temperature of between 300 and 1,000 DEG C. The nano composite material has good stability and uniformity. The iron-carbon nano composite material is wrapped outside iron nano granules by nano-scale C to form a C film; and the iron-carbon nano composite material has the characteristics of good electromagnetic wave absorption performance, wide absorption coverage frequency range, strong corrosion and oxidation resistance and low cost, and is applicable to electromagnetic shielding in a radio communication system, electromagnetic radiation and leakage of equipment of high frequency prevention, microwave heating and the like, construction of microwave darkrooms and hiding technology.

The invention discloses a graphene and ferrum diselenide composite material and a method for preparing the same. The method for preparing comprises the following steps: selenium-containing inorganic salt and ferrum-containing inorganic salt are put into a stainless steel reactor; hydrazine hydrate and source graphene solution are mixed together and stirred uniformly to form an ink black solution to be added into the reactor, and the reactor is closed so as to carry out reaction; and after the reaction is completed, natural cooling is carried out, reaction precipitate is subjected to repeated washing and suction filtering through distilled water and absolute ethyl alcohol, and after the drying, the product is collected and stored in a drying device. According to the prepared graphene and ferrum diselenide composite material, a graphene sheet wraps ferrum diselenide nanoparticles, the ferrum diselenide is tightly combined with the graphene sheet, so that high specific surface area and excellent magnetic performance are obtained. The method adopts a simple hydrothermal method, the graphene reduction oxide and the composite preparation of the praphene and the ferrum diselenide can be synchronously carried out, and the method has the advantages of simplicity in technology, low reaction temperature, low cost, green, controllability and applicability for industrial production.

The invention provides a method for preparing nano-sized Ni/Fe duplex metal, which comprises the following steps: firstly, preparation of iron nanoparticles: adding an ethanol aqueous solution of water-soluble Fe salts in a container, adding an aqueous solution of NaBH4 into the container under stirring in the presence of nitrogen gas to obtain black iron nanoparticles, and washing with diluted HCl and deoxygenated and deionized water for 3 to 5 times in the presence of nitrogen gas; then, soaking the iron nanoparticles in an ethanol aqueous solution of water-soluble Ni salts, and washing the resulting particles with anhydrous alcohol for 3 to 5 times; and finally, filtering and oven-drying to obtain the final product of nano-sized Ni/Fe duplex metal.

A method for recovering the iron nanoparticles from the emulsion used by cold rolling includes such steps as centrifugal separation to remove the most of dirt oil, and washing with detergent which is prepared from Na2CO3, Na2SiO3, detergent TX-10, n-butanol and water through proportional mixing.