10 results about "Ferrous disulfide" patented technology

The application provides a preparation method of a sodium ferrous disulfide catalyst and application of the sodium ferrous disulfide catalyst in direct coal liquefaction, and relates to the technical field of coal liquefaction.The preparation method of the sodium ferrous disulfide catalyst comprises the following steps: mixing a ferric salt solution and a Na2S solution or a NaHS solution, performing a precipitation reaction, and obtaining a precipitation reaction system; and aging the precipitation reaction system, and performing solid-liquid separation to obtain the sodium ferrous disulfide catalyst.The preparation method of the NaFeS2 catalyst is simple in process, mild in preparation condition, does not need heating and pressurization, has a wide source of raw materials, is low in cost, and is easy to be industrialized.The obtained sodium ferrous disulfide has high catalytic activity as a catalyst for direct coal liquefaction, and the oil yield and conversion rate of direct coal liquefaction are higher than those of a catalyst used in the industry at present.

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 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.

This invention discloses a 3D coral-like FeS₂ / MoS₂ core-shell heterojunction anode material and its preparation method. Through a hydrothermal method combined with a sulfidation process, ultrathin, flexible MoS₂ nanosheets are uniformly wrapped around the surface of a one-dimensional FeS₂ framework, forming a self-supporting core-shell network structure. Utilizing the significant work function difference between the two (5.653 eV for FeS₂ and 3.97 eV for MoS₂), a strong built-in electric field pointing from MoS₂ to FeS₂ is introduced at the interface. This structure significantly improves the material's interfacial electronic conductivity (inducing metallic characteristics at the interface, with a pseudocapacitance contribution rate as high as 65% at 1.0 mV / s) and lithium-ion diffusion kinetics (reducing the diffusion activation barrier to approximately 1.0 eV). After 200 cycles at 0.1 A·g⁻¹, the material maintains a reversible specific capacity of up to 1600 mAh·g⁻¹ and the charge transfer resistance is reduced to 15.2 Ω. This effectively solves the problems of severe volume expansion, serious polysulfide shuttle, and slow reaction kinetics in traditional transition metal sulfide anode materials during the conversion reaction.

The invention belongs to the technical field of environment-friendly water treatment, and particularly relates to a composite filler and a preparation method thereof. The composite material comprises an aggregate and a slurry coating layer coating the aggregate, the slurry coating layer comprises the following components in parts by mass: 0-25 parts of iron powder; 0-20 parts of elemental sulfur powder; 5 to 15 parts of ferrous disulfide; 5-12 parts of activated carbon; 3-5 parts of aluminate cement; and 3-12 parts of a pH regulator. Construction waste or spoil ceramsite is used as aggregate, efficient nitrogen removal, COD degradation and high-strength adsorption of phosphorus, H2S and other harmful gases are achieved through iron, carbon and sulfur in a slurry coating layer, ferrous disulfide can slowly release a sulfur source, the sulfur autotrophy duration time is prolonged, the sulfur utilization rate is increased, and the cost is effectively reduced while the use amount of active ingredients is reduced; the invention can effectively solve the problems of acid-base imbalance of the building waste filler, high cost of functional filler, low utilization rate and difficulty in COD (Chemical Oxygen Demand) degradation.

The application provides an electrolyte applied to a lithium ferrous disulfide battery and a preparation method, the preparation method comprises the following steps: S1, dissolving lithium nitrate and lithium iodide in dioxolane (DOL), fully stirring to make them fully dissolved, and obtaining a first solution; S2, adding ethylene glycol dimethyl ether (DME) into the first solution, fully stirring until clear and transparent, and obtaining a second solution; S3, adding dimethylacetamide (DMAC) into the second solution, fully stirring until clear and transparent, and obtaining a finished electrolyte. The solvent dimethylacetamide (DMAC) with a high DN value is added, dioxolane (DOL) is made to form a thinner interface film to ensure the diffusion efficiency of lithium ions, and the activation energy required by a reaction is reduced by weakening the ferrous-sulfur bond, so that the discharge voltage and the discharge capacity of the lithium ferrous disulfide battery in a wider temperature range, especially at low temperature, are ensured, and the rate performance of the battery is improved.

The invention relates to the technical field of electrochemical batteries, in particular to a high-temperature-resistant lithium-iron disulfide battery electrolyte and an obtained product. The high-temperature-resistant lithium-iron disulfide battery electrolyte comprises the following components in percentage by weight: 10-12wt% of lithium salt, 83-86wt% of organic solvent and 3-5wt% of glycerol additive, and the sum of the weight percentages of the substances is 100wt%. The additive is a glycerol additive; the glycerol additive is a mixture of glycerol carbonate, (1, 2-cyclosulfurous acid glyceride) benzenesulfonate and (1, 2-cyclosulfurous acid glyceride) p-toluenesulfonate. According to the lithium-iron disulfide battery disclosed by the invention, after the electrolyte disclosed by the invention is used, the high-temperature discharge performance and the high-temperature storage performance of the battery are good, and the safety performance of the battery is greatly improved.

The invention discloses a preparation method of a ferrovanadium bimetallic sulfide nano-material for oxidative removal of endocrine disrupters in a water body and application of the ferrovanadium bimetallic sulfide nano-material in advanced oxidation. The preparation method comprises the following steps: firstly, mixing a precursor solution of vanadium disulfide with a precursor solution of ferrous disulfide to obtain a precursor of ferrovanadium bimetallic sulfide; the precursor is subjected to water bath ultrasonic treatment and then subjected to a hydrothermal reaction, washing and vacuum drying are conducted after the reaction is completed, and then the powdery ferrovanadium bimetallic sulfide is obtained. Due to the synergistic effect between bimetals, the prepared iron-vanadium bimetallic sulfide nano material has stronger persulfate catalytic activation capacity than independent ferrous disulfide and vanadium disulfide, and the degradation reaction rate constant under the same reaction condition is 43 times or 2.1 times of that of independent iron or vanadium sulfide; and meanwhile, the ferrovanadium bimetallic sulfide has good pH adaptability and reusability.

The invention provides a core-shell composite sulfide material FeS2atC-MS2 and a preparation method thereof, iron disulfide (FeS2) is used as a core, a carbon sulfide M composite layer is used as a shell, M is at least one of Co and Ni, and a C-MS2 composite shell layer with a three-dimensional conductive network and a volume buffer function is formed through catalyst-free M plating and carbon-coated segmented heat treatment synchronous carbonization and gas phase vulcanization. The highest thermal decomposition temperature of the material in a thermal battery system reaches 655 DEG C (135 DEG C higher than that of FeS2), the specific discharge capacity is larger than 300 mAh / g (500 mA / cm), and the cost is only 16% of that of pure MS2. The prepared material is not only suitable for a thermal battery positive electrode material, but also can be expanded to be applied to a lithium primary battery electrode material and a lithium secondary battery electrode material, and the high-rate discharge performance and the cycling stability are remarkably improved.

The invention discloses a preparation method for synthesizing copper-doped iron disulfide nano-enzyme at low temperature. The preparation method comprises the following steps: 1) preparing ferroferric oxide; (2) low-temperature vulcanization reaction: mixing the ferroferric oxide obtained in the step (1) with a sulfur source, introducing protective gas at 150-200 DEG C, and calcining for 1-8 hours to obtain iron disulfide powder; and (3) preparing the nano-enzyme: adding the iron disulfide powder in the step (2) into a copper source solution, mixing, stirring and reacting, centrifuging, washing and drying the obtained reaction product, introducing protective gas at 120-200 DEG C, and calcining for 1-6 hours to obtain the copper-doped iron disulfide nano-enzyme, and meanwhile, providing the application of the nano-enzyme. Uniform doping of copper is achieved under the low-temperature mild condition, the copper element is successfully embedded into iron disulfide crystal lattices, a stable doping type nano-enzyme structure is formed, and the excellent peroxidase activity of the material is reserved and enhanced.