87results about "Iron sulfides" patented technology

The present application relates to the field of lithium-ion battery preparation, and provides a method for synthesizing a ferrous sulfide material from a pyrite raw material and an application. A pyrite raw material is crushed and then physically mixed with iron powder and carbon source powder, and is heated in an inert atmosphere to obtain ferrous sulfide powder; the ferrous sulfide powder is mixed with deionized water and then subjected to wet ball milling and high-speed fine grinding to obtain a ferrous sulfide suspension; then, the ferrous sulfide suspension is spray-dried to obtain a precursor of ferrous sulfide microspheres, and the precursor is annealed to obtain a ferrous sulfide material. In the present application, the ferrous sulfide material is applied to a lithium-ion battery to serve as an active material of a negative electrode. By introducing a reducing agent, the present application can solve the problem in conventional methods that pyrite cannot be directly used to synthesize ferrous sulfide due to the presence of an impurity phase. In addition, the present application involves low costs, a simple process and low energy consumption, and is environmentally friendly and easy to realize large-scale production.

The utility model discloses a ferrous sulfide passivation device which comprises a passivation box and a movable door hinged to one side of the passivation box. The spraying mechanism is arranged in the passivation box and comprises a sieve plate fixedly mounted at the bottom of an inner cavity of the passivation box, and a placement frame is arranged at the top of the sieve plate; according to the scheme, the spraying assembly and the linkage assembly are matched with each other, the spraying area of the vulcanizing machine can be increased during passivation of ferrous sulfide, meanwhile, the fixing ring can be driven to rotate through meshing connection of an asymmetric gear and a linkage gear in the spraying process, ferrous sulfide moves during passivation, and the passivation efficiency of ferrous sulfide is improved. Therefore, the passivation uniformity of ferrous sulfide is further improved while the spraying area is increased.

This invention belongs to the field of lithium-ion battery technology, specifically relating to a composite cathode material for lithium-ion batteries and its preparation method. The composite cathode material consists of three parts: a cathode matrix material, a lithium replenishment material, and a catalyst material. The preparation method is as follows: (1) preparing a composite material of the cathode matrix material and the lithium replenishment material in situ; (2) dispersing the catalyst material on the surface of the composite material and forming a stable interface layer between the catalyst material and the lithium replenishment material. Through the method of this invention: the lithium replenishment material has both surface modification of the cathode matrix material and lithium replenishment of the negative electrode, simultaneously improving the battery's initial efficiency and cycle stability; introducing the catalyst material onto the surface of the lithium replenishment material in situ fixes the free O generated by the Li release from the lithium replenishment material, alleviating the battery swelling phenomenon and further improving the battery's cycle stability and safety; moreover, the preparation process is simple, the raw materials are cheap and readily available, the production cost is low, and it is easy to promote industrial production.

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.

A method for treating polluted acidic wastewater from smelting with an activated pyrite concentrate includes: drying and grinding a pyrite concentrate, and washing twice to produce a washed pyrite concentrate powder; mixing the washed pyrite concentrate powder with a Na2S powder to produce a mixed powder, and adding purified water; allowing a reaction for 3.5 h to 4.5 h; filtering to produce an activated pyrite concentrate; subjecting the activated pyrite concentrate to aeration and standing, drying, and grinding to produce an activated pyrite concentrate powder; adding a lime slurry to the wastewater to adjust a pH; adding the activated pyrite concentrate powder, and allowing an ultrasonic treatment, continuous stirring is conducted; allowing a settlement to produce a first supernatant; adding a lime slurry to the first supernatant to adjust a pH; further allowing a settlement to produce a second supernatant; and separating the second supernatant.

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 belongs to the technical field of electro-catalytic materials, and relates to a preparation method and application of a CoFe-PBA chalcogenized carbon cloth composite material, in particular to a CoFe-PBA loaded carbon cloth Prussian blue (CoFe-PBA) precursor based on electrochemical activation. The invention discloses a method for preparing a cobalt sulfide / iron sulfide heterostructure material through sulfuration treatment and integrated application of the cobalt sulfide / iron sulfide heterostructure material in the field of hydrogen production through water electrolysis. Carbon cloth is activated through electrochemical pre-oxidation to enhance the surface activity, and after CoFe-PBA grows in situ, a uniformly dispersed CoS2 / FeS2 heterostructure is generated through calcination in a sulfur powder atmosphere. The material has high conductivity, abundant active sites and strong interface coupling effect, and shows excellent hydrogen evolution and oxygen evolution performance.

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 present application belongs to the field of mineral processing and battery electrode, and relates to a preparation method of high-performance cobalt-doped iron sulfide battery material. The present application takes cobalt-containing pyrite concentrate as raw material, first adopts regrinding-flotation method to process it, then carries out crushing and a large amount of organic matter coating, then carries out spray drying to obtain macromolecule mixed and wrapped cobalt-containing pyrite particles, and finally roasts the particles in inert atmosphere at high temperature to obtain cobalt-containing pyrite-based high-performance battery material. With the aid of natural cobalt doping characteristics, the present application realizes short-process preparation of cobalt-doped iron-based sulfide electrode material, which has the characteristics of high specific capacity, high rate, no volume effect, good stability and long cycle life, and is suitable for application in lithium ion batteries and lithium ion supercapacitors or sodium ion batteries and sodium ion supercapacitors as negative electrode lithium or sodium storage material. The preparation method of the present application is simple and efficient, has few processes, high yield and is suitable for large-scale industrial production.

The application discloses a method for preparing high dehalogenation activity micro-nano zero-valent iron material by micro-humid ball milling, and the method is characterized in that trace water, iron powder and modified substances are mixed according to a certain proportion to obtain the micro-nano ZVI material by ball milling. The material can be used for in-situ remediation and treatment of groundwater containing chlorinated organic pollutants, has higher activity compared with dry ball-milling zero-valent iron material, can completely remove target pollutants trichloroethylene in 1 hour at the fastest speed, and has good pH adaptability and still has faster degradation efficiency under alkaline conditions. The micro-nano ZVI and modified material prepared by the micro-humid ball milling method are a kind of environmental remediation material with low cost, high remediation efficiency, green and low carbon, and are easy to popularize, and have good environmental and economic benefits.

The invention discloses a method for preparing FeS / FeSn carbon aerogel and repairing hexavalent chromium contaminated soil, which comprises the following steps: preparing SA-Fe < 3 + > by using sodium alginate (SA) as biomass, adding SA-Fe < 3 + > gel into a Na2S solution, stirring, dissolving, standing, transferring the mixed solution into a culture dish, freezing in a refrigerator, transferring into a freeze dryer, and drying to obtain the FeS / FeSn carbon aerogel. And drying, grinding into powder by using a planetary ball mill, putting into a quartz boat, and carrying out constant-temperature pyrolysis in a tubular furnace to prepare the FeS / FeSn carbon aerogel. And uniformly mixing the FeS / FeSn carbon aerogel with the to-be-repaired chromium-polluted soil, adding water to maintain the water content of the soil to be 60-80 wt%, and repairing for 1-4 weeks at normal temperature. The FeS / FeSn carbon aerogel prepared by the method disclosed by the invention has a relatively good removal effect on Cr (VI) under acidic, neutral and alkaline conditions.

This invention belongs to the field of battery technology, specifically relating to a sodium-ion battery anode composite material and its preparation and application. The sodium-ion battery anode composite material comprises a carbon fiber inner layer and a hard carbon outer layer; the surface of the carbon fiber inner layer is loaded with transition metal sulfides, including SnS2 and FeS2, with the FeS2 comprising pyrite and marcasite structures; the hard carbon outer layer coats the carbon fiber inner layer and the transition metal sulfides. This invention, by designing the SnS2 / FeS2 material into a hard carbon-coated fibrous structure, not only allows for sufficient contact between the electrolyte and the material, providing ample reactive sites, but also shortens the ion transport path and improves electrochemical reaction kinetics.

The invention relates to the technical field of adsorption materials, in particular to a composite adsorption material, a preparation method thereof and a growth method of nanoscale iron sulfide crystals. The growth method of the nanoscale FeS crystal comprises the following steps: mixing a Fe < 2 + > source precursor solution and a S < 2-> source precursor solution, adding a surfactant, and stirring in a sealed manner to obtain a precursor solution; uniformly adsorbing the magnetic nanoparticles on the surface of the magnetic rod, and forming a magnetic substrate material on the surface of the magnetic rod; vertically placing a magnetic rod in the precursor solution to form a closed reaction system; gradient heating is conducted on the reaction system, the temperature is increased to a preset final temperature and kept, and nanoscale FeS crystals are generated on the surface of the magnetic substrate; during heating and keeping, the temperature of the bottom end area of the magnetic bar is always kept higher than that of the top end area, a preset temperature difference is formed, and then the magnetic bar is naturally cooled to the room temperature. The prepared composite adsorption material has extremely high recovery efficiency and adsorption rate on the gold element in the water body, and can be recycled for multiple times, so that the single-time use cost is reduced.

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 relates to the technical field of water treatment, in particular to a FeS2 nanoflower preparation technology and a wastewater nitrogen and phosphorus removal treatment method using pseudomonas immobilized by the FeS2 nanoflower preparation technology, and the method comprises the following steps: firstly, synthesizing FeS2 nanoflowers, including preparation of an iron oxide precursor, preparation of a flower-shaped alpha-Fe2O3 nano material and preparation of a flower-shaped FeS2 nano material; then carrying out co-culture on the FeS2 nanoflowers and pseudomonas to form a composite treatment system; and finally, introducing the wastewater containing nitrogen and phosphorus into the composite treatment system for nitrogen and phosphorus removal treatment. In the treatment process, the FeS2 nanoflower serves as a carrier to provide a place for growth of pseudomonas, an electron donor is provided through surface sulfur circulation (S < 2->-> SO4 < 2->), and the coupling reaction of denitrification and phosphorus precipitation is promoted. The prepared FeS2 nanoflower can efficiently enrich pseudomonas, and the prepared FeS2 and the pseudomonas are co-cultured to treat sewage, so that nitrogen and phosphorus can be efficiently removed.

The invention discloses a preparation method of high-activity selenium protease with anti-oxidation and immunoregulation effects, and relates to the technical field of deep processing of protein and trace elements. The preparation method of the high-activity selenium protease comprises the following steps: preparing a fermentation culture medium; lactobacillus plantarum and bacillus licheniformis are activated and cultured, and are mixed and inoculated into a fermentation culture medium; fermenting and monitoring the pH value of a fermentation system in real time, and obtaining fermentation liquor after the fermentation is finished; and carrying out product treatment on the fermentation liquor by adopting a low-temperature sterilization and precise ultrafiltration coupling process to obtain the high-activity selenium protease. The high-activity selenium protease prepared by the preparation method disclosed by the invention has the effects of resisting oxidation and regulating immunity.

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 application discloses a kind of heterostructures, including the following method preparation is obtained: anhydrous ferric chloride, sodium dodecyl sulfate and first portion of thiourea are added to deionized water, under stirring condition, 5~7 h after, second portion of thiourea is added, continue stirring 1~3 h, then heating 24~36 h under 180~220 DEG C, collect precipitate, after washing, dry 12~24 h under 70~90 DEG C, obtain heterostructure.The heterostructure is used as microbial fuel cell anode material, load heterostructure to carbon cloth to obtain microbial fuel cell anode, microbial fuel cell anode is used to process medium and high concentration organic wastewater, can improve the power generation performance of microbial fuel cell and COD removal rate of medium and high concentration organic wastewater.

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.

A sodium iron hydroxysulfide compound, a method for making the compound, an active material containing the compound, and an electrochemical electrode made from the active material. x [Fe(OH)2] y A method for producing a compound of FeS, said method comprising the following steps: a. mixing equimolar amounts of iron and sodium sulfide in an aqueous NaOH solution, b. heating the mixture obtained to a temperature comprised between 110°C and 210°C for a period comprised between 1 hour and 1 week, c. recovering the active material by filtration and drying in a neutral atmosphere.

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.