10 results about "Fe2o3 nanoparticles" patented technology

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.

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 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 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.