50 results about "Beta-FeOOH" patented technology

The invention discloses a beta-FeOOH nanocrystal-loaded photocatalytic composite nanofiltration membrane and a preparation method thereof. The photocatalytic composite nanofiltration membrane is prepared by performing codeposition on dopamine and polyethyleneimine on a porous supporting membrane to form a crosslinking nanofiltration membrane with a separating surface layer first and then loading beta-FeOOH nanocrystals on the separating surface layer. The loaded beta-FeOOH nanocrystals can promote photocatalytic oxidation reaction in the presence of hydrogen peroxide to degrade organic pollutants in wastewater or attached to the surface of the composite membrane, so that not only is achievement of the completely-innocent treatment of pollutant-containing wastewater facilitated, but also the pollution of the membrane surface can be reduced to achieve self cleaning of the membrane surface, and thus the separating efficiency of the composite nanofiltration membrane is improved and the service life of the composite nanofiltration membrane is prolonged.

The present invention provides a ferriferous oxide/tin oxide core-shell nanometer rod absorbing high-frequency electromagnetic wave and a preparing method thereof. The FeCl3 solution with the concentration of 0.25-1.0mol/L is placed in a hermetical high-pressure autoclave made of stainless steel and is kept for 12 hours in a baking oven in the temperature of 100-120 DEG C. After the high-pressure autoclave is naturally cooled to the room temperature, cleaning the deposit in the autoclave with water and ethanol. After dried in the temperature of 80 DEG C, the beta-FeOOH nanometer rod is obtained. Then the beta-FeOOH nanometer rod is annealed for 2.5 hours in the temperature of 500 DEG C, and the alpha-Fe2O3 nanometer rod is obtained. The 0.08g of alpha-Fe2O3 nanometer rod is ultrasonically dispersed into 32ml of water-ethanol solution. Then 0.75g of urea and 0.115g of potassium stannate are added. After mixing, the obtained solution is placed in the hermetical high-pressure autoclave made of stainless steel and is kept for 36 hours in the baking oven in the temperature of 170 DEG C. After the high-pressure autoclave is naturally cooled to the room temperature, the deposit in the autoclave is cleaned with water and ethanol. After drying in the temperature of 80 DEG C, the alpha-Fe2O3/SnO2 core-shell nanometer rod is obtained. The alpha-Fe2O3/SnO2 core-shell nanometer rod is annealed for 7 hours in the atmosphere of N2/H2 in which the volume of the H2 accounts for 8% for obtaining the porous ferriferous oxide/tin oxide nanometer rod. The method of the invention has the advantages of simple operation and suitability for the industrial production.

The invention discloses a Beta-FeOOH nanoparticle suspension preparation method, relating to a preparation method of an enhanced heat transfer medium, in particular to a stable Beta-FeOOH nanoparticle suspension. The method comprises the steps as follows: firstly, the aqueous solution of ferric trichloride and urea is prepared, wherein, the mass ratio of the ferric trichloride and the urea is 6:1; and then the aqueous solution is added into an airtight PTFE reactor, reacted at the temperature of 80 plus or minus 2 DEG C till the end, and naturally cooled to room temperature, so that the Beta-FeOOH nanoparticle suspension is obtained. The method adds no stabilizing agent, and the produced Beta-FeOOH is small in size and good in uniformity and stability. The method has the advantages of small number of production equipment, simple operating steps, low cost, and requires no additives except raw materials, thus being suitable for industrial production.

The invention discloses a hydrothermal method-based method for preparing a alpha-Fe2O3 nanotube array. The method comprises the following steps: preparing a beta-FeOOH nanorod array, namely obliquely placing a glass substrate coated with fluorine-doped stannic oxide (FTO) in a mixed liquid of FeCl3 and NaNO3, and performing hydrothermal reaction at 100 DEG C for 12h so as to obtain a beta-FeOOH nanorod array which grows on the glass substrate; and preparing the alpha-Fe2O3 nanotube array, namely annealing the beta-FeOOH nanorod array in nitrogen gas for 6h so as to obtain the alpha-Fe2O3 nanotube array. The method is high in preparation efficiency, short in production period, low in production cost, low in device requirments, and easy to operate, has effects of environment friendliness and no pollution and is suitable for mass production.

The invention provides a ferroferric oxide and zinc oxide nuclear shell nano-rod for absorbing high-frequency electromagnetic waves and a manufacturing method thereof. The manufacturing method comprises the following steps of: putting solution of FeCl3 into a stainless steel sealed autoclave, and keeping the temperature between 100 and 120 DEG C for 12 hours; when the autoclave is cooled to the room temperature naturally, washing a deposit in the autoclave by using water and ethanol; dying the deposit at the temperature of 80 DEG C to obtain a beta-FeOOH nano-rod; putting the beta-FeOOH nano-rod into aqueous solution of ethylene diamine through ultrasonic dispersion, then adding aqueous solution of Zn(AC)2 into the mixture, and reacting the mixture for 12 hours at the temperature of 120 DEG C; when the autoclave is cooled to the room temperature naturally, washing the deposit in the autoclave by using the water and the ethanol, drying the deposit in the air, and annealing the deposit for 3 hours at the temperature of 500 DEG C; performing a second treatment on the obtained powder in the aqueous solution of the ethylene diamine and the aqueous solution of the Zn(AC)2, filtering the mixture, and drying the deposit to obtain a Fe2O3/ZnO nuclear shell nano-rod; and annealing the Fe2O3/ZnO nuclear shell nano-rod for 5 to 7 hours at the temperature of between 360 and 380 DEG C under an 8 to 10 percent H2/Ar atmosphere to obtain a ferroferric oxide/zinc oxide nano-rod. The manufacturing method is simple to operate and is suitable for industrial production.

A multifunctional nanometer composite thin film, its production and use are disclosed. The thin film contains silicone, it is grafted with perfluoro-silicane 0.02í½0.1wt% on surface and doped with nanometer iron oxide particle 1í½4wt% in network, which is fusiform or needle alpha-FeOOH, beta-FeOOH, alpha-Fe2O3 or gamma-Fe2O3. The process is carried out by hydrolyzing for silane coupling agent and ethyl orthosilicate in water, alcohol and hydrolytic catalyst system, mixing, adding into alcohol, condensing and generating silicone polymer at 30í½60íÒC, adding into nanometer iron oxide particle and fluorosurfactant, reacting, obtaining thin-film sol, forming thin-film sol into film on treated substrate material, drying and curing. It achieves higher anti-aging and mechanical performances.

The invention relates to a preparation method of a cobalt-oxygen-oxygen-hydrogen-modified phosphorus-doped iron oxide photo-anode, and belongs to the technical field of new energy materials. The preparation method comprises the following steps that beta-FeOOH is generated on a F-doped tin oxide (FTO) conductive glass substrate through a hydrothermal method, then, the phosphorus-doped iron oxide photo-anode is generated by performing soaking in a phosphate solution and performing heat treatment, and finally, a layer of CoOOH is deposited on the surface of the phosphorus-doped iron oxide photo-anode by using a light-assisted electrodeposition method so as to obtain the cobalt-oxygen-oxygen-hydrogen-modified phosphorus-doped iron oxide photo-anode (CoOOH-P-Fe2O3). Due to phosphorus doping, the conductivity of the iron oxide photo-anode is improved; and furthermore, cobalt oxygen hydrogen is used as a catalyst for assistance in oxygen evolution, so that compared with basic iron oxide, thelight current density of the cobalt-oxygen-oxygen-hydrogen-modified phosphorus-doped iron oxide photo-anode prepared by using the method is improved by 200%.

The invention discloses phosphorus-nitrogen-containing polymer coated beta-FeOOH nanoparticles and a preparation method and application thereof. The nanoparticles comprise nano beta-FeOOH and a polymer coated outside the nano beta-FeOOH and containing Schiff base structures; and DOPO is added to the polymer. According to the prepared phosphorus-nitrogen-containing polymer coated beta-FeOOH nanoparticles, two flame-retardant elements including a phosphorus element and a nitrogen element are introduced, the phosphorus element can catalyze the system to form a phosphorus-rich carbon layer when rubber is burnt, and the carbon layer can stop the burning of the rubber as a protective layer; the nitrogen element can generate non-combustible gas when the rubber is burnt, and further the burning process is slowed down; in addition, due to introduction of beta-FeOOH in the system, the thermal stability of the material can be improved and the smoke suppressing effect is good; and the two flame-retardant elements phosphorus and nitrogen and the beta-FeOOH have the synergistic flame-retardant effect, so that the effect for improving the flame-retardant property of the rubber is obvious.

The invention provides a preparation method of FeOOH nanometer materials. By preparing a solution A and a solution B, the solution A is used alone or in combination with the solution B at a certain ratio to respectively prepare different-crystal-phase FeOOH nanometer materials under a certain condition, namely, alpha-FeOOH, beta-FeOOH and delta-FeOOH. The invention further discloses a cigarette filter tip added with any one of the different-crystal-phase FeOOH nanometer materials. By adding the different-crystal-phase FeOOH nanometer materials prepared by the preparation method, which is disclosed by the invention, into the cigarette filter tip, the release amount of tobacco-specific nitrosamine in cigarette mainstream smoke can be effectively decreased. The additives for the cigarette filter tip are safe and non-toxic and low in cost and the preparation method is simple and high in yield and is suitable for industrial production.

The invention discloses a titanium-doped alpha-iron oxide photo-anode, and a preparation method and an application thereof. The method comprises the steps: coating the surface of a beta-FeOOH membrane with a titanium source solution, forming a TiO2 layer during high temperature annealing, and inhibiting grain coarsening of alpha-iron oxide; at the same time, in the process, diffusing titanium ions to the interior of alpha-iron oxide crystal lattices to realize titanium doping; and after annealing, using a hydrogen peroxide aqueous solution to remove the TiO2 layer, and thus obtaining the titanium-doped alpha-iron oxide photo-anode. The photo-anode has small particle size which is 30 nm-40 nm; the maximum photocurrent density can reach 3.62 mA/cm<2> under a 300 W xenon lamp light source and at the bias of 1.23 V[RHE]; compared with a un-doped alpha-iron oxide photo-anode without introduction of the TiO2 layer, the photocurrent is increased by 5 times, and a positive shift phenomenon of initial potential is not generated.

The invention discloses a biosynthesis method of a magnetic Pd nanocomposite material and belongs to the field of nano-material bio-preparation. The biosynthesis method comprises that biological magnetic nano-particles are synthesized by a reaction of Shewanella oneidensis MR-1 and beta-FeOOH; and the biological magnetic nano-particles, Na2PdCl4 and AuCl3.HCl.4H2O are synthesized into the magnetic Pd nanocomposite material at a normal temperature. The biosynthesis method has mild reaction conditions, simple processes, short reaction time and a low cost, is a preparation technology of the green pollution-free Pd nanocomposite material, and can be used for catalytic degradation of environmental pollutants.

The invention relates to a simple preparation method for a Fe3O4@C@TiO2 magnetic separation photocatalyst. The method includes steps: 1) taking beta-FeOOH nanorods, and dispersing into water to form dispersion liquid; 2) adopting resorcinol and formaldehyde for synthesizing FeOOH@RF core-shell nanorods, and dispersing into ethyl alcohol to form dispersion liquid; 3) adding ethyl alcohol, CH3CN and ammonium hydroxide, and well stirring and mixing to form liquid A; taking ethyl alcohol and CH3CN again, well mixing, and adding TBOT to form liquid B; mixing for room-temperature reaction for a certain time to obtain the nanorods; 4) performing high-temperature calcinations to obtain the Fe3O4@C@TiO2 magnetic separation photocatalyst. The method has advantages that the magnetic-response recyclable Fe3O4@C@TiO2 visible-light nanometer photocatalyst is prepared according to the simple and mild method; the method is simple in operation and low in equipment requirement, and the prepared Fe3O4@C@TiO2 core-shell nanorods are high in dispersity and uniform in nanoparticle size.

A preparation method of a NaCl-modified graphene net-coated Beta-FeOOH lithium ion battery negative electrode material comprises the steps of dispersing graphene oxide in deionized water to obtain a suspension liquid A; adding analytically-pure FeCl<3>.6H<2>O and NaCl into the deionized water, adding the mixture to the suspension liquid A to obtain a suspension liquid B; pouring the suspension liquid B into a homogeneous-phase hydrothermal reaction kettle for hydrothermal reaction to obtain a product C; respectively washing the product C with water and alcohol, and dispersing the washed product in the water to obtain a product D; and freezing and drying the product D to obtain the NaCl-modified graphene net-coated Beta-FeOOH lithium ion battery negative electrode material. The performanceof Beta-FeOOH is improved by employing a composite graphene method, and the reason is that the graphene is good in conductivity and has relatively large specific area; by graphene wrapping, the problem of poor conductivity of Beta-FeOOH can be effectively solved, volume expansion also can be prevented, so that the battery structure is more stable; and by adding the NaCl, the grain size of the product can be controlled, the active sites of oxidization-reduction reaction during lithium intercalation and de-intercalation of the FeOOH are increased, so that the capacity and the cycle stability ofthe battery are improved.

The invention relates to an alpha-Fe2O3 porous nano bar photo-anode material for photoelectric hydrolysis hydrogen production. The liquid-solid chemical method is used for in-situ preparing of an FTO conductive glass base body loaded alpha-Fe2O3 porous nano bar and the photo-anode material comprising the above alpha-Fe2O3 porous nano bar. According to the specific preparing method, in-situ growing of a beta-FeOOH nano bar array is conducted on an FTO conductive glass base body in an FeCl3 containing dicyandiamide and sulphonated acetone-formaldehyde plymer water solution, high-temperature heat treatment is conducted, and the one-dimension alpha-Fe2O3 porous nano bar array photo-anode material is obtained. By adoption of the alpha-Fe2O3 porous nano bar array photo-anode material prepared through the method, wetting of an electrolyte in the photo-anode material can be improved, the transmission distance of photon-generated carriers is shortened, and the photoelectric hydrolysis hydrogen production efficiency is improved. According to the preparing method, operation is convenient, simple and easy to control, and the prepared photo-anode material has important application potentials in the aspects such as photoelectric catalysis.

The invention relates to a preparation method for a double-functional Beta-FeOOH/eg-C3N4 composite nanomaterial. The method comprises the following steps: using water as a solvent, adding a suitable amount of eg-C3N4, adjusting a solution pH, and adding a suitable amount of ferric salt, performing ultrasonic-processing, washing, and drying, to obtain the Beta-FeOOH/eg-C3N4 composite nanomaterial.The advantage of the method is that operation is simple and easy, a reaction condition is moderate, other chemical reagents and solvents except a raw material are prevented from being used in a wholeprocess, no by-product is generated, synchronization of combination and nano-crystalline growth is realized, cost is low, and the process environmentally friendly, and a requirement for industrializedapplication can be satisfied. A Beta-FeOOH/eg-C3N4 nano rod-like compound catalyst prepared by the method disclosed by the invention has performance of photocatalytic-degrading a pollutant in visiblelight, and capacity of generating hydrogen by electrocatalytically decomposing water.

The invention discloses a preparation method of beta-FeOOH nano-capsules, and relates to the technical field of preparation of nano-capsules. The method comprises the following steps: performing hydrolysis by using an aqueous solution of ferric chloride to generate beta-FeOOH nano-rods, and carrying out heating alcohol thermalmaturation on the beta-FeOOH nano-rods, glycerin and water to prepare the beta-FeOOH nano-capsules. The beta-FeOOH nano-capsules are successfully obtained by adopting an alcohol thermalmaturation technology with green and environmentally-friendly glycerin as a reaction medium and the beta-FeOOH nano-rods as a precursor. The method has the characteristics of simplicity in operation, low cost, and excellent visible light absorption performance of the product, and provides a simple and environmentally-friendly method for preparing capsule type nanoparticles.

The invention discloses a preparation method of a super large lamella RGO loaded ultrafine beta-FeOOH nanometer particle lithium ion battery negative electrode material. The preparation method comprises following steps: oxidized graphene is dispersed in deionized water so as to obtain a suspending liquid A; a certain amount of a soluble salt, sodium chloride, and urea are added into absolute ethylalcohol and deionized water, and then are mixed with the suspending liquid A so as to obtain a suspending liquid B; the suspending liquid B is introduced into a homogeneous hydro-thermal reaction vessel, the homogeneous hydro-thermal reaction vessel is sealed, and is introduced into a homogeneous hydro-thermal reaction equipment for hydro-thermal reaction, and then natural cooling to room temperature is carried out so as to obtain a product C; the product C is washed with water and alcohol respectively; and after washing, the product is dispersed in water so as to obtain a product D; the product D is subjected to freeze-drying so as to obtain the super large lamella RGO loaded ultrafine beta-FeOOH nanometer particle lithium ion battery negative electrode material. According to the preparation method, graphene combination and particle size reduction are adopted to improve the performance of beta-FeOOH, so that more electrochemical active sites and ion transmission channels are provided, battery reversible capacity is increased, the reversible capacity at 5000mA g<-1> is larger than 1000mAh g<-1>, and the potential capacity of the super large lamella RGO loaded ultrafine beta-FeOOHnanometer particle lithium ion battery negative electrode material is excellent.

The invention relates to iron compound particles, a method of producing the iron compound particles, and an oxidation catalyst using the iron compound particles. The iron compound particles comprise a beta-FeOOH crystal phase and a metal element other than Fe for doping the beta-FeOOH crystal phase, wherein the metal element other than Fe is at least one metal element selected from the group consisting of : Al and transition metals of 3d and 4d other than Fe belonging to Groups 4 to 12 of the periodic table, the atomic ratio of the metal element to Fe element (metal element other than Fe / Fe element) ranges from 0.001 to 0.5, and said iron compound particles satisfy at least one of the following requirements (A) and (B): (A) the iron compound particles have a crystallite diameter of 1 to 60 nm when measured by X-ray diffraction; and (B) the iron compound particles have an average particle diameter of 1 to 600 nm as measured by dynamic light scattering in the solvent.

The invention relates to a BiOCl/beta-FeOOH composite nanomaterial and a preparation method thereof, and relates to the technical field of composite nanomaterials. The method comprises the following steps: dissolving FeCl3.6H2O in distilled water, sequentially adding Bi(NO3)3.5H2O and glucose, uniformly mixing, adjusting the pH value of the above obtained mixture to 3-6, and carrying out a hydrothermal synthesis reaction to obtain the BiOCl/beta-FeOOH composite nanomaterial. Low temperature hydrothermal synthesis is adopted, glucose biomacromolecules are used to control attached growth of beta-FeOOH nanorods on BiOCl nanosheets, and spindly BiOCl/beta-FeOOH nanorods are distributed on the sheet BiOCl in the structure of the BiOCl/beta-FeOOH composite nanomaterial, so the composite nanomaterial has the advantages of high specific surface area, and excellent photocatalytic and Fenton-like catalytic activity, and is hopeful to be used as an effective catalyst for removing various organic pollutants from sewage.

The invention discloses a method for preparing a Ge-doped alpha-phase iron trioxide nanosheet array membrane. According to the method, a beta-FeOOH nanorod array membrane is firstly prepared on a FTO (fluorine-doped tin oxide) conductive glass substrate through a hydrothermal method, then the array membrane is taken as a substrate template, Ge nanometer colloidal solution obtained through liquid phase laser corrosion (LAL) is taken as a reaction precursor of impurity atom Ge, and the Ge doped alpha-Fe2O3 nanosheet array membrane is obtained through hydrothermal treatment. The method is simple, has low cost, realizes doping and can effectively control the nanostructure of alpha-Fe2O3.

The invention belongs to the field of biosynthesized nano materials, and relates to a biosynthesis method of a magnetic graphene composite material. The method comprises the following steps: regulating the pH value of 10-30 mmol/L piperazinyl-1,4-diethylsulfonic acid and 10-30 mmol/L sodium lactate to 7.0, deoxidizing and sterilizing; adding graphene oxide into a culture solution, wherein the concentration of the graphene oxide is 0.4-0.6 g/L; carrying out ultrasonic treatment for 30-80 minutes, and adding beta-FeOOH until the concentration of the beta-FeOOH is 30-80 mmol/L; carrying out anaerobic magnetic stirring for 12-36 hours; collecting the dissimilatory metal reducing bacteria in the later logarithmic growth phase; and adding the dissimilatory metal reducing bacteria into the mixed solution, and culturing at 30 DEG C under anaerobic conditions for 132-156 hours to obtain the magnetic graphene composite material. The method has the advantages of mild technical reaction conditions and low energy consumption, and is simple to operate; and the prepared magnetic graphene composite material can be used for adsorption, magnetic catalysis and the like.

The invention relates to a hydrothermal carbon modified material capable of removing an environmental estrogen pollutant 17beta-estradiol, in particular to a hydrothermal carbon/attapulgite/beta-FeOOH composite material. A preparation method of the material comprises the following steps: performing hydrothermal carbonization on attapulgite and biomass; assembling the attapulgite on the surface of hydrothermal carbon; activating with KOH; loading beta-FeOOH onto the surface of the material; increasing the specific surface area to prepare a high-performance hydrothermal carbon/attapulgite/beta-FeOOH composite adsorption material. The modified hydrothermal carbon material prepared by the method has a large quantity of adsorption sites, and can be used for efficiently removing the environmental estrogen 17beta-estradiol. Moreover, the hydrothermal carbon modified material is easy to prepare, is low in cost, has high adsorption performance, and is an adsorbent with a wide market prospect.

The invention relates to a method for removing bromate in water, particularly to a method for removing bromate in water through Fe<2+> and beta-FeOOH supported red mud ceramsite, and aims to solve problems that the drug dosage is large and Fe<2+> and beta-FeOOH are loose in a powder shape and easy to hydrolyze when Fe<2+> and beta-FeOOH are added separately to remove the bromate in the water according to existing methods. The method comprises steps as follows: a certain amount of the Fe<2+> and beta-FeOOH supported red mud ceramsite is added to a to-be-treated bromate solution, a treated solution is obtained after vibration at a certain temperature, and the bromate concentration of the solution is measured. The bromate in the water is removed with the method.