22 results about "Fe2o3 nanoparticles" patented technology

The invention discloses a short-Fe-C-bond Fe-based catalyst for catalyzing CO2 hydrogenation, a preparation method of the short-Fe-C-bond Fe-based catalyst and application of the short-Fe-C-bond Fe-based catalyst in preparation of C2 < + > high-added-value products, and belongs to the technical field of CO2 capture, utilization and storage. The catalyst is a carbon quantum dot doped Fe-based catalyst, and is prepared by the following steps: dissolving carbon quantum dots CQDs in an ethanol aqueous solution to obtain a CQDs dispersion liquid; and then adding cubic Fe2O3 nanoparticles, stirring for reaction, and drying to obtain the Fe-based catalyst with the short Fe-C bond. The short Fe-C bond Fe-based catalyst is simple to prepare and low in cost, can realize high-selectivity synthesis of C2 + products through one-step catalytic hydrogenation of CO2, and effectively reduces the selectivity of main C1 by-products CO and CH4. The invention develops a new regulation and control strategy for the electronic structure of the Fe-based catalyst for the CO2 hydrogenation catalytic reaction, provides a new thought for reasonably designing the catalyst with a directional synthesis function, and has a good application prospect in the field of CO2 capture, utilization and storage.

The invention discloses a self-weight configuration oxygen evolution electrode and a preparation method and application thereof.The preparation method comprises the steps that a nickel substrate serving as a working electrode, a platinum sheet serving as a counter electrode and a saturated calomel electrode serving as a reference electrode are placed in a NiCo2O4 precursor solution, constant-potential electro-deposition is conducted on the nickel substrate, and a precursor electrode with a Ni-Co LDH precursor on the surface is obtained; putting the precursor electrode into a heating device for heating and heat preservation, and then taking out the precursor electrode for cooling to obtain a NiCo2O4 electrode with a spinel structure; and sequentially putting the NiCo2O4 electrode into a ferric nitrate nonahydrate aqueous solution and a sodium hydroxide solution, and loading alpha-Fe2O3 nanoparticles on the surface of the NiCo2O4 electrode by using a continuous ion layer adsorption reaction method to obtain the self-weight configuration oxygen evolution electrode. According to the preparation method of the self-weight configuration oxygen evolution electrode, a composite catalyst layer composed of NiCo2O4 and alpha-Fe2O3 of a spinel structure is constructed on a nickel substrate, and the self-weight configuration oxygen evolution electrode can adapt to power fluctuation.

The invention belongs to the technical field of catalytic luminescence detection, and discloses a carbon monoxide catalytic luminescence detection method which comprises the following steps: respectively preparing alpha-Fe2O3 nanoparticles and an alpha-Fe2O3 / reduced graphene oxide composite material based on ferric chloride hexahydrate, urea, an anhydrous hydrazine solution and graphene oxide powder; respectively carrying out material characterization on the prepared alpha-Fe2O3 nanoparticles and the alpha-Fe2O3 / reduced graphene oxide composite material so as to analyze the structural performance of the alpha-Fe2O3 nanoparticles and the structural performance of the alpha-Fe2O3 / reduced graphene oxide composite material; the prepared alpha-Fe2O3 nanoparticles and the alpha-Fe2O3 / reduced graphene oxide composite material are used as catalytic luminescence gas sensitive materials, and catalytic luminescence detection is carried out on carbon monoxide under preset conditions. The response strength of the composite material to CO is improved by several times under the same condition, the response time and the recovery time can reach the second level respectively, and rapid detection in the true sense is achieved.

The present application relates to a kind of local high-entropy oxide modified iron oxide electrocatalyst and its preparation method and application.The iron oxide electrocatalyst uses α-Fe2O3 Nanoparticle as matrix, and α-Fe2O3 Nanoparticle is embedded with high-entropy oxide phase composed of Fe, Co, Ni, Zn, Mn.Compared with prior art, the present application can retain the cost and reserves advantage of iron oxide material while realizing multi-dimensional precise regulation of catalyst lattice, electronic structure and reaction path through local high-entropy engineering, solve the core pain point of insufficient activity and stability of iron-based catalyst in pure water and natural seawater system, and realize high-performance application of iron-based catalyst in water electrolysis, natural seawater-based zinc-air battery and other scenarios.

The invention belongs to the technical field of catalysis, and particularly relates to a multifunctional red mud catalyst as well as a preparation method and application thereof. The multifunctional red mud catalyst comprises red mud coated SnO2 composite particles and Fe2O3 nanoparticles dispersed on the surfaces of the red mud coated SnO2 composite particles, wherein the red mud coated SnO2 composite particles comprise red mud and SnO2 particles loaded on the surfaces of the red mud; the Fe2O3 nano particles, the red mud and the SnO2 form a heterojunction. The catalyst integrates the functions of detection, adsorption and photocatalytic degradation, is used for treating tetracycline antibiotics in a water body, and realizes diagnosis and treatment integrated treatment on antibiotic wastewater. The method disclosed by the invention has the advantages of high sensitivity, good selectivity, simplicity in operation, strong anti-interference capability, low detection limit and the like, and can be applied to specific detection and removal of tetracycline antibiotics in a water body.

The invention provides a preparation method of a modified biochar material and application of the modified biochar material in cadmium-containing wastewater treatment, and relates to the technical field of biochar adsorbent preparation. The method comprises the following steps: pretreating biomass, loading Fe2O3 nanoparticles on the surface of the biomass, mixing the product with potassium carbonate, pre-carbonizing, modifying by using sodium sulfide, and finally calcining to obtain the modified biochar material. According to the technical scheme, the sulfur-containing functional groups and the Fe2O3 nanoparticles are modified on the biochar at the same time, a large number of active sites can be provided for the biochar, meanwhile, the passivation effect on cadmium is synergistically improved, efficient adsorption of cadmium is achieved, pre-carbonization can enter the biochar by means of CO2 generated in the thermal decomposition process of potassium carbonate to generate pore channels, and the adsorption efficiency of cadmium is improved. The material is endowed with more pore structures, and the specific surface area and adsorption capacity of the modified material are improved. By adopting the preparation method provided by the invention, the modified biochar material with excellent cadmium adsorption performance can be prepared.

This invention belongs to the field of antibiotic wastewater treatment technology, specifically relating to a quantum dot-modified weakly magnetic S-type heterojunction photocatalyst ZnIn2S4 / α-Fe2O3, its preparation method, and its application. The preparation method of this quantum dot-modified weakly magnetic S-type heterojunction photocatalyst ZnIn2S4 / α-Fe2O3 is as follows: zinc salt, indium salt, and sulfur source are added to water to prepare a homogeneous solution; then α-Fe2O3 nanoparticles are added, and the mixture is heated at 30-90℃ for 1-6 hours to allow ZnIn2S4 to grow in situ on α-Fe2O3. After washing and drying, the product is obtained. This invention employs a simple solvothermal combined with a mild water bath chemical in-situ growth technique to synthesize a low-cost, easily magnetically recoverable, universally applicable, and highly efficient antibiotic removal weakly magnetic S-type heterojunction photocatalyst ZnIn2S4 / α-Fe2O3.

The application discloses a visible light catalyst and a preparation method and application thereof, the visible light catalyst is Sb-Fe2O3 prepared from Sb doped Fe2O3, and is prepared through a solvothermal method, and the microstructure of the visible light catalyst is a near-spherical nanoparticle aggregate.The near-spherical Sb-Fe2O3 nanoparticle aggregate prepared by the one-step solvothermal method has high catalytic activity in the visible light range and is easy to separate, can efficiently catalyze and reduce hexavalent chromium in water to trivalent chromium, and the photocatalytic reduction rate of hexavalent chromium is 37 times that of pure Fe2O3 and 44.4 times that of TiO2 P25, and the efficiency of the visible light catalyst for treating hexavalent chromium wastewater is significantly improved; the preparation method has simple process, does not need complex equipment, and is easy to operate, the synthesized product has good crystallinity and stability, is easy to store for a long time, and does not affect the catalytic performance; the near-spherical nanoparticle aggregate not only improves the catalytic efficiency, but also is easy to separate and recover from the solution, and has good application prospect in treating industrial wastewater containing hexavalent chromium.

The invention relates to a Ti3C2Tx / Fe2O3 / CNTs humidity-sensitive material and a preparation method thereof, Ti3C2Tx is used as a template, through hydrothermal reaction with FeCl3, Fe2P3 is generated and is self-assembled to the surface of Ti3C2Tx, a Ti3C2Tx / Fe2P3 material is finally formed, the Ti3C2Tx / Fe2P3 material and a uniform aqueous dispersion of carbon nanotubes ( / CNTs) are fully mixed, the materials are assembled together through Van der Waals force, and the Ti3C2Tx / Fe2O3 / CNTs composite material is obtained. Ti3C2Tx has abundant surface properties and excellent structural stability, an ideal platform is provided for generation of Fe2O3 nanoparticles, and CNTs are connected with all Ti3C2Tx / Fe2P3 lamellar structures to form a continuous and stable conductive network. A network structure formed by connecting the CNTs is like an electron transmission'highway ', so that the overall resistance change of the material caused by water molecule adsorption / desorption can be extremely sensitively transmitted out, and the signal response of the sensor is amplified. According to the preparation method, the humidity sensitive material with high sensitivity and excellent responsiveness can be obtained, the preparation process is simple, and the humidity sensitive material can be practically applied to the fields of industry, environmental monitoring, medical treatment and the like.

The invention belongs to the technical field of preparation of medical degradable metal-based composite materials, and relates to a biodegradable composite material and a preparation and application method thereof. The preparation method comprises the following steps: 1, taking graphene oxide, silver nitrate and ferric nitrate as raw materials, and enabling Ag and Fe2O3 nanoparticles to grow on the surface of the graphene oxide together in situ through a hydrothermal method, so as to form (Ag + Fe2O3) coated GO; 2, (Ag + Fe2O3) coated GO is uniformly dispersed in Zn powder through wet ball milling, and (Ag + Fe2O3) coated GO / Zn mixed powder is obtained; and 3, the mixed powder is subjected to sintering and plastic processing, and the ZnO-coated GO / Zn-Fe-Ag alloy-based composite material is prepared. And reinforcing the zinc matrix by using an in-situ alloying reaction between the Ag nanoparticles and the zinc matrix, and endowing the zinc matrix with an antibacterial characteristic, so as to finally obtain the biodegradable ZnO (at) GO / Zn-Fe-Ag biological composite material with good comprehensive performance.

The invention relates to a method for preparing a Fe / Co-N-C catalyst through a subject-object strategy. The preparation method comprises the following steps: adding zinc nitrate hexahydrate, cobalt nitrate hexahydrate, F127, 2-methylimidazole and 30nm Fe2O3 nanoparticles into a methanol solution, uniformly stirring, carrying out reflux reaction, centrifuging, drying to obtain a Fe2O3 (at) Co-ZIF-8 precursor, and carrying out high-temperature pyrolysis calcination on the Fe2O3 (at) Co-ZIF-8 precursor to obtain the Fe / Co-N-C catalyst. The method is simple in synthesis steps, and the prepared catalyst is suitable for efficiently catalyzing an acidic oxygen reduction reaction.

The application discloses a wear-resistant nanometer gradient composite coating and a magnetron sputtering method thereof, and belongs to the technical field of material surface treatment. The wear-resistant nanometer gradient composite coating is composed of oxide nanoparticles and a soft layer. The soft layer is coated on the outside of the oxide nanoparticles during friction. The oxide nanoparticles gradually decrease from the surface to the center of the coating, and the soft layer gradually increases from the surface to the center of the coating, forming a reverse composite gradient layer. The soft layer and the oxide nanoparticle layer are obtained through the magnetron sputtering method. The soft layer is composed of Ag and Cu soft metals. The oxide nanoparticles are Fe2O3 nanoparticles. The oxide nanoparticles have a bearing effect, and can reduce fretting wear of the material through rolling. The soft metal has a coating and bonding effect on the nanometer oxide particles. The wear-resistant nanometer gradient composite coating and the magnetron sputtering method thereof can solve the problem that the existing wear-resistant nanometer hard coating is easy to peel off, thereby affecting the service life of the coating.

The invention discloses an alpha-Fe2O3-TiO2 composite catalytic material as well as a preparation method and application of the alpha-Fe2O3-TiO2 composite catalytic material. According to the technical scheme, DMF serves as a solvent, an iron source and terephthalic acid are added, an MOF material MIL-101 (Fe) is prepared through a solvothermal method, and alpha-Fe2O3 is obtained by calcining the MIL-101 (Fe). Then taking alpha-Fe2O3 as a substrate, ethanol as a solvent and tetrabutyl titanate as a raw material, and synthesizing an alpha-Fe2O3-TiO2 composite photo-thermal catalytic material by adopting an in-situ deposition method; according to the preparation method, alpha-Fe2O3 and TiO2 are combined to form a binary heterojunction, charge separation is facilitated, electrons are kept in a conduction band region of TiO2, alpha-Fe2O3 nanoparticles are absorbed in a visible light region, the defect that TiO2 is only absorbed in an ultraviolet light region is exactly overcome, the light absorption capacity of the material is improved, and the photoelectric conversion efficiency of the material is improved. Meanwhile, the photo-thermal catalytic performance of the alpha-Fe2O3-TiO2 composite material on cyclohexane oxidation is also improved, and the preparation method belongs to the technical field of catalysis.

The invention discloses a preparation method and application of Co-NX-coated Ni / gamma-Fe2O3 nanoparticles with a heterojunction structure, and the preparation method comprises the following steps: adding Ni salt and ferrite into an organic solvent to form a Ni-Fe oleic acid complex with sodium oleate, adding CoPc, uniformly mixing, heating in a water bath, and calcining at high temperature in a hydrogen atmosphere to finally obtain the nanoparticles with the heterojunction structure. The method is simple and easy to implement, the cost of raw materials is low, large-scale production can be achieved, the prepared nanoparticles have the structural advantages of being large in specific surface area, good in conductivity, resistant to high temperature and the like due to the unique heterojunction structure, meanwhile, due to introduction of Co-Nx, the electronic structure of a heterogeneous heterogeneous interface can be effectively regulated and controlled, and the electro-catalysis reaction path is optimized. Therefore, the Co-NX-coated Ni / gamma-Fe2O3 shows excellent catalytic activity and stability on alkaline oxygen evolution reaction, and the performance of the Co-NX-coated Ni / gamma-Fe2O3 is far superior to that of a commercial RuO2 catalyst.

This invention discloses a short Fe-C bond Fe-based catalyst for catalytic CO2 hydrogenation, its preparation method, and its application in the preparation of C 2+ This invention relates to the application of high-value-added products, belonging to the field of CO2 capture, utilization, and storage technology. The catalyst is a carbon quantum dot-doped Fe-based catalyst, prepared by the following method: dissolving carbon quantum dots (CQDs) in an aqueous ethanol solution to obtain a CQDs dispersion; then adding cubic Fe2O3 nanoparticles, stirring the reaction, and drying to obtain a short Fe-C bond Fe-based catalyst. The short Fe-C bond Fe-based catalyst of this invention is simple to prepare, low in cost, and can achieve highly selective one-step catalytic hydrogenation of CO2 to C. 2+ The product is obtained by effectively reducing the selectivity of the main C1 byproducts CO and CH4. This invention opens up a new strategy for regulating the electronic structure of Fe-based catalysts for CO2 hydrogenation catalysis, providing a new approach for the rational design of catalysts with directed synthesis capabilities, and has good application prospects in the field of CO2 capture, utilization, and storage.

The invention discloses a catalytic material for degrading fluoroquinolone antibiotics by activating persulfate, Fe2O3 nanoparticles and CeO2 nanoparticles are introduced into a carbon nanotube channel, and Fe / Ce nano metal particles are assembled in the carbon nanotube channel, so that the catalytic material is obtained; the catalytic material can degrade fluoroquinolone antibiotics in a water body at room temperature. According to the invention, the nanometer confinement catalyst is successfully constructed: Fe2O3 and CeO2 nanoparticles are introduced into a carbon nanotube (CNTs) channel so as to construct the nanometer confinement catalyst; according to the catalytic material, the degradation rate of fluoroquinolone antibiotics is greatly increased, the inner cavity structure and unique electronic regulation and control characteristics of the CNTs are fully utilized, the physical adsorption effect and advanced oxidation advantages of the CNTs are comprehensively utilized, and an efficient degradation mode of suction and oxidation is constructed.

The application discloses a self-reconfigurable oxygen evolution electrode, a preparation method and application, and relates to the technical field of electrochemistry. The preparation method comprises the following steps: taking a nickel substrate as a working electrode, a platinum sheet as a counter electrode, and a saturated calomel electrode as a reference electrode, and placing the electrodes in a NiCo2O4 precursor solution; performing constant potential electrodeposition on the nickel substrate to obtain a precursor electrode with a Ni-Co LDH precursor on the surface; placing the precursor electrode into a heating device for heating and heat preservation, then taking out the precursor electrode for cooling to obtain a NiCo2O4 electrode with a spinel structure; and placing the NiCo2O4 electrode into an iron nitrate nonahydrate aqueous solution and a sodium hydroxide solution in sequence, and loading alpha-Fe2O3 nanoparticles on the surface of the NiCo2O4 electrode by using a continuous ion layer adsorption reaction method to obtain the self-reconfigurable oxygen evolution electrode. The preparation method of the self-reconfigurable oxygen evolution electrode constructs a composite catalytic layer composed of the spinel structure NiCo2O4 and alpha-Fe2O3 on the nickel substrate, and can adapt to power fluctuation.

The invention belongs to the technical field of SERS (Surface Enhanced Raman Scattering) detection, and particularly relates to a preparation method of a composite SERS substrate and application of the composite SERS substrate in industrial dye detection. The preparation method comprises the following steps: preparing Fe2O3 nanoparticles by using a hydrothermal method; the preparation method comprises the following steps: adding indium sulfide tetrahydrate, thioacetamide and Fe2O3 nanoparticles into water, and obtaining an In2S3 (at) Fe2O3 composite material by utilizing a secondary hydrothermal method; sodium citrate is dissolved in water, silver nitrate and the In2S3-coated Fe2O3 composite material are added, Ag nanoparticles are reduced on the surface of the In2S3-coated Fe2O3 composite material through a chemical reduction method, and the Ag-coated In2S3-coated Fe2O3 composite SERS substrate is obtained through drying. By integrating the local surface plasma resonance effect of Ag nanoparticles, the charge separation capacity of In2S3 and the surface active site of Fe2O3, an efficient interface charge transfer channel is constructed, and the Raman signal of RB molecules is enhanced. The substrate has a synergistic effect of electromagnetic enhancement and chemical enhancement, and high-sensitivity and specific detection of trace RB is realized.

The application discloses a preparation method of PEG-DA modified magnetic iron oxide nanoparticles, and comprises the following steps: synthesizing small-size Fe2O3 nanoparticles by adopting a thermal decomposition method; and modifying the Fe2O3 nanoparticles by PEG-DA. The Fe2O3 nanoparticles synthesized by the thermal decomposition method are easy to control in shape and size, have high crystallinity, high controllability in size, and small aggregation trend, and the method is more advanced in synthesizing iron oxide nanoparticles with higher performance. The Fe2O3 nanoparticles modified by PEG-DA (polyethylene glycol-dopamine) can increase hydrophilicity and improve biocompatibility, and the obtained Fe2O3@PEG-DA nanoparticles are good in stability and have good T1 performance.

A method for producing crystalline α-Fe2O3 nanoparticles involving ultrasonic treatment of a solution of an iron (III)-containing precursor and an extract from the seeds of a plant in the family Linaceae. The method involves preparing an aqueous extract from the seeds of a plant in the family Linacae and dropwise addition of the extract to the solution of an iron (III)-containing precursor. The method yields crystalline nanoparticles of α-Fe2O3 having a spherical morphology with a diameter of 100 nm to 300 nm, a mean surface area of 240 to 250 m2 / g, and a type-II nitrogen adsorption-desorption BET isotherm with a H3 hysteresis loop. A method for the photocatalytic decomposition of organic pollutants using the nanoparticles is disclosed. An antibacterial composition containing the crystalline α-Fe2O3 nanoparticles is also disclosed.

The invention relates to the field of gas sensors, and discloses a composite material based on Fe2O3 and Nb2C as well as a preparation method and application thereof. The composite material based on the Fe2O3 and the Nb2C is prepared from the Nb2C and Fe2O3 nano particles loaded on the Nb2C. The composite material based on Fe2O3 and Nb2C has a relatively large specific surface area and excellent catalytic activity, can work under a room temperature condition when being applied to a sensor, is high in response speed to H2S, wide in detectable H2S volume concentration range and low in detection lower limit, and is simple to operate in a preparation process and easy to industrialize.

The application relates to the technical field of biology, and particularly discloses a cell microcarrier capable of MRI tracing and a preparation method thereof. The preparation method of the cell microcarrier capable of MRI tracing comprises the following steps: in step one, gamma-Fe2O3 nanoparticles and water are uniformly mixed through ultrasonic mixing, silk fibroin is added and uniformly stirred, then a baicalin solution and castor oil are added and uniformly mixed and stirred, ultrasonic emulsification is carried out at 3-5 DEG C to obtain a mixed emulsion; in step two, the mixed emulsion prepared in step one is added drop by drop into castor oil, stirred for 20-35 min, then cooled, anhydrous ethanol is added, extraction is carried out, centrifugal separation is carried out, and drying is carried out to obtain the cell microcarrier. The cell microcarrier prepared in the application can be used for supporting stem cells to exert better therapeutic effects in vivo.