54results about "Iron sulfides" patented technology

The application discloses a pyrite-based composite positive electrode material, a preparation method thereof and application of the pyrite-based composite positive electrode material in a full-solid-state battery, and relates to the technical field of battery materials. The preparation method of the pyrite-based composite positive electrode material comprises the following steps: (1) performing shock ball milling treatment on pyrite block crystals to obtain iron sulfide powder; (2) mixing lithium sulfide and lithium iodide, and then performing high-energy ball milling treatment to obtain a lithium iodine sulfur amorphous mixture; and (3) mixing the iron sulfide powder and the lithium iodine sulfur amorphous mixture, and then performing high-energy ball milling treatment to obtain the pyrite-based composite positive electrode material. The pyrite-based composite positive electrode material is combined with a solid electrolyte membrane and a lithium indium negative electrode, and a pyrite composite positive electrode sulfide full-solid-state battery with high capacity and low attenuation can be prepared, and the pyrite composite positive electrode sulfide full-solid-state battery exhibits high specific capacity and long cycle performance.

This invention discloses a cubic spinel-structured sulfide composite gas-sensitive material, a gas sensor, its preparation method, and its application, belonging to the field of gas sensor technology. The preparation method of this composite gas-sensitive material involves using FeCl2, CdCl2, and InCl3 as metal sources, and thiourea as a sulfur source, placing them together in a solvent of water, adding citric acid or sodium citrate as a dispersant, and obtaining a precursor material through a hydrothermal reaction. After calcination and annealing, a cubic spinel-structured FeIn2S4 / CdIn2S4 heterojunction material powder is obtained. The two gold electrodes and the ceramic tube of the gas sensor are coated with the cubic spinel-structured sulfide composite gas-sensitive material. The gas sensor based on this invention, made from a cubic spinel-structured sulfide composite gas-sensitive material, has a simple manufacturing process, low production cost, and is suitable for industrial mass production. It has broad application prospects in the field of acetone detection in trace hazardous situations.

The invention relates to the technical field of electrochemical uranium extraction, in particular to a uranium extraction method based on electrochemical mediation FeS active site regeneration. According to the specific technical scheme, under the anaerobic condition, a nano FeS modified working electrode is prepared on a carbon-based material through in-situ deposition, and a corresponding electrochemical uranium extraction system is constructed. The system operates at room temperature and low energy consumption, and U (VI) is efficiently reduced into low-toxicity and indissolvable tetravalent uranium and enriched on the surface of an electrode through efficient adsorption and coordination effects of FeS active sites on uranyl ions and driving of cathode potential. According to the uranium extraction method of the nano FeS in-situ modified carbon cloth electrode provided by the invention, consumed FeS active sites are regenerated in situ by utilizing an electrochemical method, and the high activity and long-term stability of the electrode are maintained. The method shows high extraction capacity, high selectivity and excellent cycle performance for uranium in uranium mine wastewater and seawater, and provides a reliable way for efficient and sustainable uranium resource recovery.

The present application belongs to the field of metallurgy, and relates to a method for producing antimony white by directly oxidizing crude antimony, comprising the following steps: S1, mixing crude antimony with crude antimony alloy, and reacting under an oxygen-containing atmosphere, to obtain oxidized slag and a melt after the reaction is completed; S2, adjusting the temperature of the melt, and then introducing compressed air to react, to produce antimony trioxide-containing flue gas, and to obtain antimony oxide slag after the reaction is completed. The present application makes full use of impurities such as sodium sulfide, sodium hydroxide and sodium thiosulfate contained in crude antimony, and innovatively uses these components for arsenic removal reaction, which not only avoids the cumbersome steps of adding various auxiliary materials in the traditional process, but also enables the original sodium sulfide, sodium hydroxide and sodium thiosulfate in the crude antimony to fully play a synergistic role, showing excellent performance in arsenic removal effect, thus simplifying the process flow, significantly reducing the production cost, and realizing the dual improvement of economic benefit and process efficiency.

The application relates to the technical field of sodium ion battery negative electrode materials, and discloses a preparation method and application of a copper-iron sulfide / nitrogen-doped porous carbon composite material, which comprises the following steps: (1) mixing copper salt, potassium ferricyanide, a nitrogen source and polyethylene glycol, and obtaining a copper-iron Prussian blue precursor after ball milling; (2) pyrolyzing the copper-iron Prussian blue precursor under an inert atmosphere, washing and removing impurities, and drying to obtain an intermediate product; and (3) heat-treating the intermediate product and a sulfur source under an inert atmosphere to obtain a copper-iron sulfide / nitrogen-doped porous carbon composite material. Through the synergistic effect of the double-metal sulfide and the nitrogen-doped porous carbon composite, sodium ions with a larger ion radius can be more easily embedded and de-embedded in the interlayer spacing, meanwhile, abundant active sites are provided to enhance ion storage, so that the sodium ion battery has outstanding rate performance and stable cycle performance.

The application relates to an artificial wetland filler and a preparation method and application thereof, and relates to the field of environmental treatment. The filler is composed of pyrite quantum dots PQD and carbon dots CDs. After the carbon dots CDs are made into powder, the powder is dissolved in distilled water, continuous magnetic stirring and boiling to 100 DEG C are carried out, immediately, pyrite quantum dots PQD with the same mass as the carbon dots CDs are added, stirring is carried out in dark conditions, after centrifugation, washing is carried out with distilled water, vacuum freeze-drying is carried out, and the PQD-CDs composite material is obtained. The filler can significantly enhance the pollutant removal efficiency, and has important significance for the treatment of farmland wastewater. The innovative method contributes to the improvement of the efficiency and sustainable development in the field of water treatment.

The application belongs to the technical field of preparation of lithium-sulfur battery electrode materials, and particularly relates to a Fe7S8-CNTs / S composite lithium-sulfur battery positive electrode material and a preparation method thereof.The positive electrode material has an interlayer space structure, Fe7S8 nanoparticles are attached to hollow carbon nanotubes CNTs in the positive electrode material, a nanostructured Fe7S8-CNTs is obtained, and S is uniformly loaded on the Fe7S8-CNTs.CNTs can limit the shuttling of LiPSs through a physical constraint effect, on the one hand, Fe7S8 effectively inhibits the "shuttling effect" through chemical adsorption of LiPSs, and on the other hand, the conversion activation energy of LiPSs is reduced to Li2S2 and Li2S.Due to the special structure of the electrode and the perfect combination of CNTs and Fe7S8, the Fe7S8-CNTs / S positive electrode has excellent electrochemical performance.In summary, the material is a new type of host material with adsorption and high conductivity characteristics that can be applied to lithium-sulfur battery positive electrodes.

The invention relates to the technical field of land pollution treatment, solves the problem that in the prior art, when a large-area medium polluted by hexavalent chromium is treated, the addition amount of ferrous sulfide is prone to being inaccurate, and consequently the remediation effect is not ideal, and provides ferrous sulfide particles with shells and a preparation method and application of the ferrous sulfide particles. The prepared ferrous sulfide particles with the shells can keep efficient removal of chromium within the pH value range of 5-9, the problem that the adsorption behavior of a traditional model in a low-chromium-concentration area is difficult to predict is effectively solved by means of a correction adsorption model with higher fitting precision, and therefore the actual demand quantity of target repairing liquid can be accurately predicted, and the application prospect is wide. The target repairing liquid can be injected more accurately, and excessive or insufficient injection is avoided. After hexavalent chromium is reduced into trivalent chromium by ferrous sulfide, the trivalent chromium and carboxymethyl cellulose can form a stable chelate, and zero-valent sulfur can also form a compact passivation layer on the surface of a polluted medium, so that the trivalent chromium is prevented from being reoxidized, and long-term stable repair of hexavalent chromium is realized.

The invention belongs to the technical field of batteries, and particularly relates to a preparation method and application of an iron-based sulfide composite material. MIL-101 (Fe) and thiourea react under the hydrothermal condition and then react with graphene oxide, the iron-based sulfide composite material is obtained, and the iron-based sulfide composite material shows excellent electrochemical performance and serves as a battery negative electrode material. According to the preparation method, MIL-101 (Fe) is used as a precursor, the MIL-101 (Fe) is used as an ideal template, the MIL-101 (Fe) and low-toxicity thiourea are subjected to low-temperature hydro-thermal synthesis to form the double-phase metal sulfide with uniform morphology, the energy consumption is low, the process is mild and controllable, the high porosity and the regular morphology of the MIL-101 precursor are inherited and reserved to the greatest extent, and the preparation method has the advantages of simple process, high yield and high yield. And meanwhile, collaborative construction of heterojunction and pores is realized.

The invention discloses a pyrite-based composite positive electrode material, a preparation method thereof and an application of the pyrite-based composite positive electrode material in an all-solid-state battery, the preparation method of the pyrite-based composite positive electrode material comprises the following steps: (1) carrying out oscillation ball milling treatment on pyrite square crystals to obtain iron sulfide fine powder; (2) mixing lithium sulfide and lithium iodide, and then carrying out high-energy ball milling treatment to obtain a lithium-iodine-sulfur amorphous mixture; and (3) mixing the iron sulfide fine powder and the lithium-iodine-sulfur amorphous mixture, and then carrying out high-energy ball milling treatment to obtain the pyrite-based composite positive electrode material. The pyrite-based composite positive electrode material is combined with a solid electrolyte membrane and a lithium-indium negative electrode, so that a high-capacity and low-attenuation pyrite composite positive electrode sulfide all-solid-state battery can be prepared, and high specific capacity and long circulation performance are shown.

The invention provides a magnetic zinc doped NH2-MIL-125 (Ti) coated FeSx core-shell material and a preparation method thereof, and belongs to the technical field of core-shell materials. In the preparation process, Fe < 2 + > (Zn-2-MeIM-Fe) is fixed on the surface of zinc-doped NH2-MIL-125 (Ti) through coordination of 2-MeIM zinc sites and Fe < 2 + >, the zinc-doped NH2-MIL-125 (Ti) and FeSx is obtained after hydrothermal reaction vulcanization, and compared with the zinc-doped NH2-MIL-125 (Ti) / FeSx material without using 2-MeIM, the zinc-doped NH2-MIL-125 (Ti) and FeSx material has a complete disc-shaped core-shell morphology. Under the protection effect of 2-MeIM, the MOF component is more stable in the vulcanization process, and the proportion of Fe3S4 in FeSx is higher than that of FeS2. The photocatalyst shows higher activity in removal of imidacloprid by photocatalytic activation of peroxymonosulfate (PMS), and the removal rate reaches 99.9% within 10 min. In addition, the catalyst has better cycling stability, and the removal rate of 97.9% is still kept after four times of cycling.

The invention provides a method of cascade flash (FWF) Joule heating and a system thereof. The FWF Joule heating process subjects an external feedstock in an external vessel to a flash Joule heating process, wherein the flash Joule heating process of the external feedstock causes conversion of an internal feedstock within an internal vessel (the internal vessel is within the external vessel) to a converted material.

The invention provides a negative active material and a preparation method thereof, a negative pole piece, a battery and electric equipment. And the negative electrode active material comprises a FeIn2S4 / FeS heterostructure. The FeIn2S4 / FeS heterostructure in the negative electrode active material can improve the conductivity of the negative electrode active material and the capability of storing active ions, so that the negative electrode active material with excellent cycle performance and rate capability is obtained.

This invention discloses a sulfur-deficient iron disulfide catalyst, its preparation method, and its applications. The catalyst is prepared by a hydrothermal reaction of an NH2-MIL-101(Fe) precursor with a sulfur source. This catalyst possesses abundant sulfur vacancies, numerous active sites, high catalytic activity, and strong cycle stability. It can be used as an electro-Fenton catalyst for the efficient degradation of antibiotics. Its preparation method is simple, low-cost, and suitable for industrial production.

The invention discloses a preparation method of a high-performance wave-absorbing material FeS2 / MXene composite material. The preparation method is specifically implemented according to the following steps: step 1, preparing FeS2 powder; step 2, preparing an MXene material; and step 3, stirring the FeS2 powder in a cationic surfactant, washing, drying, mixing with MXene, and freeze-drying to obtain the FeS2 / MXene composite material. According to the preparation method of the high-performance wave-absorbing material FeS2 / MXene composite material, the FeS2-MXene composite structure is prepared, and the wave-absorbing performance of MXene is remarkably improved. The invention also discloses an application of the high-performance wave-absorbing material FeS2 / MXene composite material in electromagnetic wave absorption.

The application relates to a high-energy-density iron-based sulfide thin film electrode and a preparation method thereof, and belongs to the technical field of electrode materials. Main steps of the application include the following: the surface of a porous iron base is subjected to ultrasonic pretreatment to remove impurities; a reaction solution is prepared by mixing a metal base, an alkali metal sulfide, a citrate and deionized water; the porous iron base is immersed in the reaction solution to perform hydrothermal treatment, so that in-situ growth reaction occurs on the surface of the porous iron base, and an iron-based sulfide thin film electrode material with a nanosheet structure which is upright on the surface of the porous iron base and is crosslinked with each other is obtained. The preparation method has the advantages of easy availability of raw materials, simple operation, low production cost, high energy storage activity of the material and suitability for large-scale energy storage.

The invention relates to a Fe2O3 / FeS nanosheet heterostructure electrocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: heating and mixing ferric chloride hexahydrate, a sulfur source and ethylene glycol to obtain a deep eutectic solvent DESs; and heating the deep eutectic solvent DESs in a microwave reactor, then washing the DESs with a cleaning agent, and drying the DESs to obtain the Fe2O3 / FeS nanosheet heterostructure electrocatalyst. The preparation method provided by the invention is simple in process, mild in condition, low in preparation cost and suitable for industrial production. And the obtained Fe2O3 / FeS nanosheet electrocatalyst with the heterostructure has excellent electrocatalytic activity.

The application belongs to the field of sodium ion batteries, and discloses a preparation method of a carbon-confined tin-iron sulfide composite material and application thereof. The application prepares an iron hydroxyl stannate oxide precursor through a mechanical chemical reaction, realizes construction of a carbon composite structure through secondary ball milling, and finally obtains a tin-iron sulfide carbon composite material through gas phase sulfuration. The method has the advantages of simple preparation, solvent-free production in the preparation process, green environmental protection, high yield and the like. The tin-iron sulfide carbon composite material obtained finally has excellent cycle performance and rate performance when used as a negative electrode material of a sodium ion battery.

The invention relates to a preparation method and normal / low temperature application of a ferrous disulfide-graphene aerogel composite electrode material. The material comprises a three-dimensional porous graphene aerogel skeleton and ferrous disulfide nanoparticles loaded on three-dimensional porous graphene aerogel. The specific preparation method comprises the following steps: firstly, synthesizing nanoscale ferroferric oxide through hydrothermal reaction under the regulation and control of TEA (triethanolamine), then carrying out hydrothermal compounding on the nanoscale ferroferric oxide and graphene oxide, and freeze-drying to form a ferroferric oxide-graphene aerogel precursor; finally, the precursor is converted into the ferrous disulfide-graphene aerogel composite material through a solid-phase vulcanization method. The conductivity of the material is improved, the contact area of an electrode and an electrolyte is increased, active sites are increased, the problem of volume expansion of the material in the charging and discharging process is relieved, and the material shows good rate capability and cycling stability in normal-temperature and low-temperature environments as a sodium-ion battery negative electrode material.

The present application aims to improve the volumetric energy density of an active material constituting an electrode of a lithium ion secondary battery while maintaining the capacity retention rate thereof. The present application provides a method for preparing a sulfur-based active material, comprising the following steps: (1) mixing an acrylic resin, sulfur, and an iron compound containing divalent or trivalent iron ions to obtain a raw material; and (2) calcining the raw material; wherein the median particle size of the iron compound is 12.00 pm or less.

This invention discloses a pyrite-based transition metal-doped energy storage material, its preparation method, and its applications. The energy storage material is prepared by ultrasonic high-speed shearing of pyrite suspension A with an oxidant and a transition metal salt to obtain suspension B, which is then filtered, dried, and sintered with a carbon source to obtain the final product. Based on the high theoretical specific capacity of pyrite, this energy storage material significantly improves the energy band gap of pyrite through transition metal doping modification, effectively reducing material defects, thereby promoting electron transport and increasing interfacial electron conversion efficiency. Supercapacitors or secondary batteries prepared using the energy storage material provided by this invention have advantages such as high specific capacity, high rate capability, no volume effect, and good stability. Testing shows that lithium-ion batteries prepared using the material provided by this invention have a specific capacity of approximately 1200 mA g after 100 cycles. ‑1 The specific capacity of the sodium-ion battery after 100 cycles is consistently around 700 mA g. ‑1 above.

The invention discloses an ultra-fast thermal injection hydrothermal synthesis device and a preparation method of a barite oxygen isotope standard substance, and belongs to the technical field of chemical reaction engineering. The hydrothermal synthesis device comprises a gas supercharger, a normal-temperature high-pressure kettle, a high-temperature high-pressure kettle, a first stop valve and a second stop valve. The preparation method of the barite oxygen isotope standard substance comprises the following steps: putting a barium chloride aqueous solution into a normal-temperature high-pressure kettle, and adding a sodium sulfate aqueous solution into the high-temperature high-pressure kettle; closing the second stop valve, opening the first stop valve, and heating the high-temperature high-pressure kettle; high-purity argon is injected into the normal-temperature high-pressure kettle to 20-50 MPa, the first stop valve is closed, the second stop valve is opened, the barium chloride solution is rapidly injected into the high-temperature high-pressure kettle, and the barite oxygen isotope standard substance is obtained after the reaction is conducted for 12 h. A pure water phase system is adopted, the problem of surface pollution caused by using an organic solvent and a surfactant in a traditional hot injection method is thoroughly avoided, and the obtained nano powder is high in purity.

The invention discloses a metal sulfide catalyst for olefin / alkyne carboxylation reaction and a heterogeneous reaction process, the metal component of the catalyst is any one or more of Fe, Co, Ni, Cu, Zn, Cr, Mo and W, the S vacancy is an active center, and the concentration of the S vacancy is measured through in-situ NO chemisorption and is controllable in 50-500 [mu] mol gcat <-1 >. Metal, an S source compound and a template agent are evenly mixed according to a certain proportion, a template is etched after heat treatment is conducted for a certain time at a certain temperature, and remaining solids are reduced at the corresponding temperature. The obtained catalyst is used for olefin / alkyne carboxylation reaction, and the catalyst can directly convert olefin / alkyne, carbon monoxide and alcohol into ester compounds in one step with high efficiency and high selectivity under the action of hydrogen. The catalyst provided by the invention does not need any acid additive and can be recycled, a heterogeneous reaction process is carried out under a hydrogen condition, and the method has the advantages of high economic benefit, environmental friendliness, safety, easiness in operation and the like.

The invention relates to a sulfur-doped iron-based nano-enzyme and a preparation method and application thereof, and the preparation method comprises the following steps: 1) dissolving iron nitrate nonahydrate and L-cysteine in a mixed solvent composed of water and ethylene glycol to obtain a mixed solution; and 2) carrying out a hydrothermal reaction on the mixed solution, cooling to room temperature, filtering, washing, and drying to obtain the sulfur-doped iron-based nano enzyme FeSx-T. The sulfur-doped iron-based nano-enzyme prepared by the invention belongs to a nano-material, has a relatively large specific surface area and catalytic active sites, is simple in preparation method, low in cost, high in stability, environment-friendly and suitable for large-scale preparation, can be used for detecting the norfloxacin in an environmental water sample, and is low in consumption of the required sulfur-doped iron-based nano-enzyme in a detection process, so that the detection cost is low. The detection cost is reduced, the detection sensitivity is high, the response time is short, and the detection time is greatly shortened.

This invention relates to the field of manufacturing electrode materials for thermal batteries, specifically a method for preparing gold-doped sulfide materials. The invention employs a low-temperature hydrothermal method to construct a doped framework, forming a uniform and complete micron- and / or nano-scale Au dopant on the framework. Then, a sulfur-addition process is used to achieve a more stable embedding of the dopant within the FeS2 particles, resulting in excellent thermal stability and high effective discharge capacity when the product is used as a thermal battery. The product obtained by this invention has a discharge specific capacity greater than or equal to 361 mAh / g and an internal resistance less than or equal to 0.102 Ω. The process of this invention is simple and controllable, and the resulting product has excellent performance, facilitating industrial application.

This invention provides a core-shell structured carbon-coated FeS nanosphere, its preparation method, and its applications. The carbon-coated FeS nanosphere comprises FeS particles and a hollow carbon shell coating the FeS particles. The outer diameter of the hollow carbon shell is 0.5–1.7 μm, and the inner diameter is 0.3–1.1 μm. The particle size of the FeS particles is 50–280 nm. The preparation method includes: preparing FeOOH nanoparticles; dispersing the FeOOH nanoparticles in ethanol; dispersing n-pentane and n-dodecylamine in ethanol, adding water, adding the FeOOH dispersion, adding resorcinol, then adding ammonia and formaldehyde solution, stirring the reaction to obtain a solid product; calcining; and sulfidation. The carbon-coated FeS nanospheres prepared by this invention exhibit excellent microwave absorption performance in the resulting composite material at a low filling amount, and the carbon-coated FeS nanospheres also have good sodium ion storage performance.

The invention discloses a synthesis method of amorphous iron sulfide, which is characterized by comprising the following steps: step 1, dissolving FeCl3. 6H2O in deionized water, and stirring until the FeCl3. 6H2O is completely dissolved to obtain an iron salt solution; 2, adjusting the pH value of the ferric salt solution to 2.0-4.0 by using an alkaline solution and an acidic solution; step 3, putting the solution with the adjusted pH value into an ice-water bath, and slowly adding the ground NaSH.xH2O under the protection of a nitrogen atmosphere; step 4, continuously stirring and reacting in the ice-water bath, and then carrying out aging treatment; and 5, carrying out centrifugal separation on the reacted suspension, sequentially washing with ethanol and deionized water respectively, and finally, carrying out freeze drying to obtain the amorphous iron sulfide. The synthesis method disclosed by the invention is simple in process, mild in condition, good in repeatability, environment-friendly and suitable for batch preparation, and the obtained amorphous iron sulfide has a good application prospect in the fields of catalysis, energy storage and the like.

The application relates to the field of sodium ion batteries, and discloses a preparation method of hierarchical porous Fe7S8 / nitrogen-doped carbon composite nanowires and application thereof. The application takes NTA as a metal ion chelating agent, chelates zinc ions and iron ions through a solvothermal reaction, and prepares a ZnFe-NTA precursor; the precursor is pyrolyzed at high temperature under an inert atmosphere, metal ion reduction is induced through a carbon thermal reaction, low-boiling-point zinc particles are volatilized, nitrogen-doped carbon formed through in-situ conversion of an organic ligand is combined, and a hierarchical porous structure is generated; finally, a gas-phase sulfuration method is adopted to form Fe7S8, and the hierarchical porous Fe7S8 / nitrogen-doped carbon composite nanowires are obtained. When the composite nanowires are used as a negative electrode of a sodium ion battery, the hierarchical porous structure can effectively promote full infiltration of electrolyte and rapid migration of sodium ions, and can improve cycle stability and rate performance.

This invention belongs to the field of nerve damage repair drugs, specifically involving the application of nano-metal sulfides in the preparation of drugs for treating diseases caused by brain nerve damage. Its advantages are: it provides a new approach to preparing nerve damage repair drugs; the materials are readily available, low in cost, and easy to prepare.