33 results about "Sublimed sulphur" patented technology

The invention relates to lithium sulfide and a preparation method thereof.The preparation method includes the following steps that sublimed sulfur powder and a lithium source are mixed and subjected to a heating reaction, and the lithium source comprises at least one of anhydrous lithium hydroxide, lithium hydroxide monohydrate, lithium oxide, lithium hydride and lithium carbonate; a reducing gas is introduced while the heating reaction is performed, or the reducing gas is introduced after the heating reaction is finished, and a reduction reaction is performed; and after the reaction is finished, introducing protective gas for calcining to prepare the lithium sulfide. The preparation method provided by the invention can realize low-cost and high-purity production of lithium sulfide, and ensures the safety and environmental protection of the production process.

The invention relates to the technical field of preparation of high-entropy alloy materials, in particular to a C / S / HES composite electrode material based on high-entropy sulfides and a preparation method and application thereof.The preparation method comprises the following steps that a carbon material is dispersed in N, N-dimethylformamide to obtain a carbon material dispersion liquid, an iron source, soluble metal salt and sublimed sulfur are mixed with a carbon source solution, and the carbon material dispersion liquid is obtained; carrying out hydrothermal reaction to obtain high-entropy sulfide; mixing a carbon source with sublimed sulfur, and carrying out hot melting treatment to obtain a carbon / sulfur positive electrode material; the preparation method comprises the following steps: taking a high-entropy sulfide as an electrocatalyst, mixing and grinding the high-entropy sulfide and a carbon / sulfur positive electrode material, and carrying out hot melting treatment to obtain the C / S / HES composite electrode material based on the high-entropy sulfide. The electrochemical kinetics of soluble NaPSs in the sodium-sulfur battery is accelerated by screening a proper high-entropy sulfide catalytic host, and the electrochemical behavior is improved.

The invention discloses a preparation method of nano sulfur, which comprises the following steps: (1) adding 5-10 g of sublimed sulfur and 50 mL of N-methyl pyrrolidone into a 300 mL round-bottom flask, then placing the round-bottom flask in an oil bath at 25-125 DEG C, and stirring for 15-60 min; and (2) filtering the mixture to take filtrate, then adding the filtrate into a 300 mL beaker, adding 100-200 mL of deionized water into the beaker at one time at normal temperature under vigorous stirring, and continuously stirring for 5-10 minutes. And (3) centrifugally separating the mixture at 8000-12000 rpm for 5-10 min or filtering the mixture to obtain a precipitate, and washing the precipitate with deionized water for 3 times. And (4) placing the washed precipitate in a vacuum drying box at 80 DEG C, and drying for one night to obtain the nano sulfur. Researches show that sublimed sulfur is taken as a raw material, N-methyl pyrrolidone is taken as a solvent, deionized water is taken as a titration solvent, nano sulfur is prepared by adopting a heterogeneous titration method, and the method is simple in process, easy to operate, easy in condition control, low in synthesis cost and suitable for industrial large-scale production.

The application discloses a high-entropy alloy type FeS2@C composite material and a preparation method and application thereof, and belongs to the technical field of entropy alloy material preparation. The high-entropy alloy type FeS2 / C composite material is prepared from a raw material of an iron source, metal soluble salt, sublimed sulfur and a carbon material dispersion liquid, and then ethylene glycol solution is added, stirring is performed until dissolution, and hydrothermal reaction is performed at 180-200 DEG C. The high-entropy alloy type FeS2 / C composite material is prepared by the solvent thermal reaction of the application, the synthesized FeS2 / C material is uniform in particle size, small in particle size and good in dispersibility. The application improves the utilization rate of reactants, shortens the reaction time, improves the yield, and has the advantages of simple operation, low requirement on reaction equipment, mild conditions, mass production and the like. The high-entropy alloy type FeS2@C composite material with excellent performance is prepared by a simple and efficient preparation method.

The invention relates to the technical field of energy storage, in particular to a sulfur-doped interconnected hollow porous composite carbon nano-microsphere, a preparation method and application of the sulfur-doped interconnected hollow porous composite carbon nano-microsphere. According to the invention, resorcinol-formaldehyde resin and coal pitch are used as carbon sources, and sublimed sulfur is used as a sulfur source; the preparation method comprises the following steps: uniformly mixing resorcinol-formaldehyde resin, coal pitch and sublimed sulfur, putting the mixture into a carbonization furnace, and heating in an argon atmosphere to prepare the sulfur-doped interconnected hollow porous composite carbon nano-microspheres. The specific surface area of the hollow porous composite carbon nanospheres is 230-390 m < 2 > / g; the total pore volume is between 0.16 cm < 3 > / g and 0.38 cm < 3 > / g; as a negative electrode material of a potassium ion battery, in a 1.0 M potassium bis (fluorosulfonyl) imide (KFSI) electrolyte, when the current density is 0.1 C, the specific capacity reaches 394.6 mAh / g; and when the current density is 5C, the capacity is kept at 200.6 mAh / g after circulation is carried out for 1 to 500 times. When the current density is increased to 20C, the specific capacity can reach 140.4 mAh / g, and high capacity and good rate capability are shown.

The invention relates to the technical field of luminescent materials, discloses a mechanoluminescent material as well as a preparation method and application thereof, and aims to solve the problems of difficulty in controlling the valence state of copper ions, complexity in treating flux residues and difficulty in balancing process parameters in the preparation of the existing mechanoluminescent material. The preparation method of the mechanoluminescent material comprises the following steps: synthesizing a copper-doped zinc sulfide nanocrystal precursor by adopting a wet chemical method, and carrying out annealing treatment by sublimed sulfur in-situ generation of a sulfur-rich reducing atmosphere in combination with a non-traditional fluxing agent. By adopting the technical scheme, the valence state of the copper ions can be accurately controlled, the post-treatment process is simplified, and the luminous efficiency, the stability and the batch consistency are improved.

The invention discloses a carbon-coated sulfur-modified hollow tubular manganese dioxide catalyst and a preparation method and application thereof.The preparation method comprises the steps that hollow tubular manganese dioxide and a tris (hydroxymethyl) aminomethane solution are mixed, dopamine hydrochloride is added, polydopamine-coated hollow tubular manganese dioxide is prepared, the polydopamine-coated hollow tubular manganese dioxide and sublimed sulfur are mixed for pyrolysis, and the carbon-coated sulfur-modified hollow tubular manganese dioxide catalyst is obtained. The carbon-coated sulfur modified hollow tubular manganese dioxide catalyst is obtained. The prepared catalyst has the advantages of high catalytic activity, good stability, environmental friendliness and the like, is an environmental functional catalyst with excellent performance, can be used as a heterogeneous catalyst for efficiently activating potassium permanganate, can realize efficient degradation of organic pollutants (such as sulfamethazine) in a water body, and is good in reusability, low in use cost and suitable for industrial production. The method has high use value and good application prospect. The preparation method also has the advantages of simple process, environmental protection, low cost and the like, is suitable for large-scale preparation, and is beneficial to industrial application.

The invention discloses a WS2 / W composite material, a preparation method thereof and application of the WS2 / W composite material in a sodium-sulfur battery. The preparation method comprises the following steps: uniformly stirring isopropanol and acetone to obtain a mixed solution A; weighing tungsten hexachloride, adding the tungsten hexachloride into the mixed solution A, and uniformly stirring to obtain a mixed solution B; transferring into a reaction kettle, sealing and putting into a drying oven for reaction; after the reaction is finished, carrying out suction filtration and washing on a product by using industrial alcohol, and drying in a vacuum oven to obtain W18O49 powder; the method comprises the following steps: weighing W18O49 powder and sublimed sulfur, respectively and correspondingly placing the W18O49 powder and sublimed sulfur in a first porcelain boat and a second porcelain boat, then placing the second porcelain boat in the first porcelain boat, placing the second porcelain boat in a tubular furnace, introducing argon into a furnace chamber of the tubular furnace, after the pressure of the furnace chamber is increased to 0.2-0.3 MPa, keeping the airtightness of the system, heating to 1100-1300 DEG C at the rate of 20 DEG C / min, keeping the pressure at 0.2-0.3 MPa in the heating process, and keeping the temperature for 2-3 hours; and after the temperature reaches 1100-1300 DEG C, continuously preserving heat for 2 hours, introducing argon, cooling to room temperature, and collecting to obtain WS2 / W powder. The problems of poor conductivity of the sulfur positive electrode, polysulfide shuttle effect and slow reaction kinetics are solved.

The application relates to polysulfide technology, in particular to a high-concentration polysulfide solution preparation method and application in a liquid flow battery. The application directly reacts cheap alkali metals with sublimed sulfur to obtain a high-concentration sulfide solution. Different sulfur content solutions have corresponding standard hydrogen electrode potentials, wherein high-sulfur-content solutions such as X2S8 have the highest potential and can be used as the positive electrode of the liquid flow battery, the X2S4 with the lowest potential can be used as the negative electrode of the liquid flow battery, X=Li, Na or K, and the sulfur content of X2S8 is twice that of X2S4. The high-concentration sulfide content makes the theoretical energy density of the liquid flow battery exceed 80 Ah L ‑1 .

The present application belongs to the field of sulfur dioxide production, and particularly relates to an improved sulfur dioxide production method with reduced sublimed sulfur. The method of the present application improves production efficiency by controlling the sulfur feeding frequency of a sulfur incinerator, stabilizing the liquid level of the sulfur incinerator, optimizing the sublimed sulfur discharge mode of a wire mesh tower, and controlling the outlet temperature of a cooling tower. The method can be adjusted according to actual production conditions, reduces the generation of sublimed sulfur and system resistance, prolongs the service life of a felt filter, has high energy utilization rate, and is thus suitable for industrial large-scale production.

The application discloses a MOFs derived iron sulfide heterogeneous electro-Fenton catalyst, a preparation method thereof and application of the catalyst in degradation and removal of organic pollutants. The preparation method of the catalyst is as follows: iron metal organic framework material MOFs and sublimed sulfur are mixed, supercritical technology is used to make the sulfur easily enter the MOFs material channel, and then calcination is performed to make the MOFs framework collapse, and the sulfur element reacts with the metal iron element to generate iron sulfide, so that the electron transfer efficiency of the material is further improved, and the pH of the Fenton reaction is widened. The catalyst synthesis process is simple, convenient and controllable, the prepared granular catalyst is applied to a heterogeneous electro-Fenton system, has good catalytic effect, and overcomes the defect that a traditional electro-Fenton catalyst is difficult to recover. The method provides an innovative method for a heterogeneous electro-Fenton cathode.

The invention relates to the technical field of petroleum refining, in particular to an in-situ presulfurization method of a hydrogenation catalyst taking sublimed sulfur as a sulfurizing agent, which comprises the following steps: step 1, dissolving sublimed sulfur solid in an organic solvent to form a sulfurizing agent solution, mixing the sulfurizing agent solution with hydrogen, and heating to sulfurization temperature; 2, the mixed material obtained in the step 1 is injected into a hydrogenation reactor, the hydrogenation reactor is filled with a hydrogen sulfide initiator and an oxidation-state catalyst to be vulcanized, and the hydrogen sulfide initiator is located on the upstream of the oxidation-state catalyst; and step 3, carrying out heating vulcanization on the mixed material under preset reaction conditions, carrying out gas-liquid separation on a reaction product, recycling a gas-phase product, and supplementing sublimed sulfur to a liquid-phase product for cyclic utilization. According to the present invention, the cheap and low-toxicity sublimed sulfur is adopted to replace the traditional CS2 or DMDS vulcanizing agent, such that the flammable, explosive, high-toxicity and other problems are solved, the vulcanization effect is equivalent to the vulcanization effect in the prior art, the existing hydrogenation device does not need to be transformed, and the significant safety and the significant economy are provided.

The present invention relates to a method for reducing the amount of sulfur generated in the tail gas from the acid hydrolysis of titanium concentrate. The method comprises the following steps: mixing the titanium concentrate with concentrated sulfuric acid, then adding water to initiate a reaction, and heating to perform a primary acid hydrolysis reaction, thereby producing an acid ore slurry; subjecting the acid ore slurry to a secondary acid hydrolysis reaction in an aerobic environment, thereby oxidizing the pyrrhotite in the titanium concentrate under acidic conditions into an intermediate product that adheres to the pyrrhotite surface, reducing the formation of elemental sulfur, and producing a slaking material; and leaching the slaking material to extract an acid hydrolysis titanium solution. This method solves the problem of sublimated sulfur generated in the existing titanium dioxide production process from titanium concentrate, which tends to remain in production pipelines, thereby clogging the pipelines and affecting the continuity and economic efficiency of production.

The utility model discloses gasification efficient combustion automatic sulfur furnace equipment which comprises a sulfur melting box, the pumping box is connected with the sulfur melting box; the gasification combustion chamber is arranged at the output end of the pumping box; the gas chamber air feeder is connected with the input end of the gasification combustion chamber; the flue gas pipeline is arranged at the output end of the gasification combustion chamber; the combustion hearth is connected with the output end of the mixed flue gas pipeline; the air distribution pipeline is arranged above the combustion hearth; the air distribution fan is arranged at the input end of the air distribution pipeline; one end of the first air conveying pipeline is connected with the output end of the air distribution pipeline; one end of the second air conveying pipeline is connected with the output end of the air distribution pipeline; and the PLC mechanism is in communication connection with the sulfur melting box, the pumping box, the air chamber air supply machine and the air distribution machine. Compared with the prior art, the technical scheme disclosed by the utility model has the advantages that sulfur can be fully combusted, the combustion efficiency is improved, sublimed sulfur is effectively avoided, and the device is safe and environment-friendly.

The application provides a preparation method of a metal sulfide modified porous carbon selenium positive electrode material, and belongs to the technical field of lithium selenium battery positive electrode materials. The main purpose is to comprehensively improve the shuttle effect and the serious volume expansion in the lithium selenium battery. The main scheme comprises the following steps: high-temperature pyrolysis and etching of zeolite imidazolate framework coated with silicon dioxide SiO2@ZIF8 to obtain a porous carbon carrier; fully mixing the porous carbon carrier with a NiCl2.6H2O or FeCl3.6H2O or CoCl2.6H2O solution, and performing centrifugal drying and other steps to obtain a powder; mixing the obtained powder with sublimed sulfur according to a certain proportion, and then performing gas phase sulfuration at 350 DEG C for 3h in a tube furnace in an argon atmosphere to obtain a metal sulfide loaded three-dimensional porous carbon. The product is used as a battery positive electrode material.

The present invention relates to a preparation method and device for high-purity lithium sulfide applied to the technical field of lithium sulfide preparation. The preparation method includes steps such as raw material pretreatment, pre-reaction, high-temperature calcination, and vacuum purification. The present invention selects lithium carbonate powder and sublimed sulfur powder with a purity of not less than 99.9% as raw materials, and can obtain high-purity lithium sulfide. Moreover, the raw materials are stored through a purity-preserving storage device, which can properly store the raw materials, effectively avoid the deterioration of the raw materials, thereby ensuring the purity of the raw materials, preventing the reduction of the raw material purity, and further guaranteeing the high purity of the prepared lithium sulfide. When taking out the raw materials, the raw materials can be taken out under relatively sealed conditions, which can not only prevent the remaining raw materials in the storage tank from being polluted, but also prevent the leakage of inert gas from causing pollution. In addition, it can also prevent the raw materials from being lifted to form dust, which can not only further ensure the purity of the raw materials, but also greatly improve the practicability and safety of the purity-preserving storage device.

The application provides a sublimed sulfur raw material medicine and a preparation method thereof, and belongs to the technical field of chemical medicines, and comprises the following steps: S1, industrial sulfur is added into a sublimation instrument, a vacuum is started, and then the temperature is gradually increased to 160-180 DEG C, the sulfur is heated and sublimated by controlling different temperatures in different temperature zones; S2, after the sublimation is completed, the furnace cavity is opened, and the sublimed sulfur solid material is collected, and the sublimed sulfur solid material is obtained.The sublimed sulfur solid material is prepared by the simple sublimation method, the preparation method is simple, the prepared product is high in purity and good in quality.

The invention discloses a Ni-MoS2-NiS2 catalyst as well as a preparation method and application thereof, and belongs to the technical field of hydrogen production by electrolysis of water. The preparation method of the Ni-MoS2-coated NiS2 catalyst comprises the following steps: by taking a molybdenum source and a nickel source as raw materials, preparing a molybdenum-nickel alkoxide precursor by adopting a solvothermal method; and calcining the molybdenum nickel alkoxide precursor and sublimed sulfur powder in an inert atmosphere to prepare the Ni-MoS < 2 >-coated NiS < 2 > catalyst. The Ni-MoS2-coated NiS2 electrolyzed water HER catalyst synthesized by the invention is prepared by a simple one-step method, has excellent electrolyzed water HER activity and stability, has potential application prospects in the field of hydrogen production by electrolyzed water industrialization, and provides theoretical guidance and technical support for design synthesis and practical application of other non-noble metal-based electrolyzed water catalysts.

The present invention relates to a preparation method of a chromium / manganese bimetallic sulfur cathode composite material, belonging to the technical field of lithium-sulfur battery cathodes. In the present invention, a MIL-101(Cr) precursor is prepared by a hydrothermal method; the MIL-101(Cr) precursor is dispersed in deionized water to obtain a suspension C, KMnO4 is added to the suspension C and stirred for 2-3 h, then a dilute H2O2 solution is added and stirred for 2-3 h, solid-liquid separation is carried out, the solid is washed with deionized water more than three times, and then uniformly heated to a temperature of 900-950 °C in an argon atmosphere and thermally decomposed at a constant temperature for 2-3 h to obtain Cr2O 3 / MnO x -C; Cr2O 3 / MnO x -C and sublimed sulfur powder are ground and mixed evenly, and uniformly heated to a temperature of 155-165 °C in an inert gas and reacted at a constant temperature for 18-20 h, and cooled to room temperature to obtain a chromium / manganese bimetallic sulfur cathode composite material S / Cr2O 3 / MnO x -C. The chromium / manganese bimetallic sulfur cathode composite material S / Cr2O 3 / MnO x -C has excellent electrochemical performance. Compared with the sulfur cathode prepared from the original MOF material MIL-101(Cr), the initial specific capacity at 0.1C is increased by 43%, the 100-cycle performance is increased by 27%, and the rate performance and Coulomb efficiency are improved.

The invention discloses a phosphorus-free high-temperature corrosion inhibitor which is characterized by comprising the following components in parts by mass: 10-40 parts of organic polysulfide; the general formula of the organic polysulfide is R-Sx-R, R is an alkyl group containing 8 to 14 carbon atoms or a naphthenic base group or an aromatic group, and x ranges from 2 to 8; the structural formula of the nitrogen-containing boric acid ester is shown in the specification, wherein R is an alkyl group containing 10-18 carbon atoms. The corrosion inhibitor has an adsorption film and a reaction film at the same time, under the synergistic effect of the adsorption film and the reaction film, a protective film on the metal surface is more compact, and the corrosion inhibition effect of the phosphorus-free corrosion inhibitor is greatly improved. In addition, the corrosion inhibitor is stable in quality and performance, sublimed sulfur and boric acid in the raw materials are low in cost, and popularization and application in refinery plants are facilitated.

The application discloses a kind of bisphenol A thio phosphine hydrazine class silver, zinc and cadmium ion fluorescent probe, specifically utilize bisphenol A and hexamethylenetetramine under acidic conditions Duff aldehyde group reaction obtains bisphenol A dialdehyde compound, simultaneously utilize diphenyl phosphine chloride and sublimation sulfur carry out sulfuration reaction and obtain intermediate 1, again 1 and hydrazine hydrate carry out substitution reaction and obtain intermediate 2, intermediate 2 and bisphenol A dialdehyde compound carry out amine aldehyde condensation reaction and prepare probe DPSN.The fluorescent probe of the application responds quickly and has high specificity recognition chemical fluorescence sensor, can be used for the detection of trace Ag + 、Zn 2+ And Cd 2+ In environment, with good practical application and popularization value, and preparation raw material is easy to obtain, synthesis is simple, and yield is high.

The invention discloses a preparation method of a carbon-based adsorption material for water treatment, which comprises the following steps: S1, dissolving 2.7 g of PAN in 25 g of DMF (Dimethyl Formamide), and mechanically stirring until the PAN is completely dissolved to obtain a 10% PAN spinning solution; s2, the 10% PAN spinning solution obtained in S1 is subjected to electrostatic spinning under the conditions that the spinning voltage is 15-18 kV, the distance between an electrostatic spinning head and a collecting roller is 5-9 cm, the rotating speed of the collecting roller is 380 rpm, the advancing speed of the spinning head is 0.8-1.0 mL / h, the spinning time is 4 h, and a spinning sheet is obtained; s3, pressing the spinning sheet obtained in the step S2 by using a high-temperature-resistant glass plate; s4, the material obtained in S3 and sublimed sulfur are evenly mixed according to the mass ratio of 1: 10 and then placed in a tubular furnace to be calcined for 2 hours under nitrogen protection, the perborate and the hydrogen persulfate heterogeneous catalysis system cooperate, the adsorption energy between the hydrogen persulfate and the catalyst can be increased, and the activation efficiency of the hydrogen persulfate in heterogeneous reaction is effectively improved.

The embodiment of the invention relates to a lithium-sulfur battery positive electrode material, a preparation method thereof and a lithium-sulfur battery. The preparation method comprises the following steps: dissolving cobalt salt and tin salt in deionized water according to a required molar ratio, carrying out ultrasonic treatment to obtain a mixed solution, adding a surfactant and a carbon material into the mixed solution, and continuously carrying out ultrasonic treatment to obtain a first suspension; dropwise adding an alkali solution into the first suspension, and stirring to obtain a second suspension; carrying out vacuum filtration on the second suspension, and washing to obtain CoSn (OH) 6 / C powder; uniformly grinding the CoSn (OH) 6 / C powder and excessive sublimed sulfur powder, putting the powder into a porcelain boat, and obtaining Co3Sn2S2 / C powder by a high-temperature vulcanization method; and further adding sublimed sulfur powder into the Co3Sn2S2 / C powder, uniformly grinding, loading into a porcelain boat, and obtaining the S / Co3Sn2S2 / C composite material through a melt diffusion method.

The invention provides application of a sulfur-containing compound as an iron-nickel battery negative electrode additive and a preparation method of the sulfur-containing compound. The preparation method comprises the following steps: mixing a trivalent metal oxide and sublimed sulfur powder according to the mass ratio of 3: 1, and adding a proper amount of solvent to form slurry; heating and evaporating the slurry, and removing the solvent to form a solid precursor; putting the solid precursor into a tubular furnace, and sintering for 3 hours at the temperature of 350 DEG C; after sintering, crushing the product to obtain an iron oxide compound containing a small amount of ferrous sulfide as an additive; adding the prepared additive into ferroferric oxide serving as a negative electrode material of the iron-nickel battery according to the proportion of 10wt%; adding a proper amount of binder, and stirring into uniform slurry; coating a punched iron strip with the slurry, and drying and rolling to form an electrode plate; and by adding the additive containing the sulfur compound, the cycling stability of the negative electrode of the iron-nickel battery is effectively improved, and the service life of the battery is prolonged.

The invention discloses a high-entropy sulfide catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: pretreating foamed nickel NF with hydrochloric acid, a solvent and deionized water to obtain pretreated foamed nickel; the preparation method comprises the following steps: uniformly mixing water-soluble metal salts corresponding to at least five metals of Fe, Co, Ni, Cu, Al, Mn and Mo, NH4F and urea, and carrying out hydrothermal reaction to obtain an M hydroxide precursor / NF from foamed nickel; wherein M is at least five metals selected from Fe, Co, Ni, Cu, Al, Mn and Mo; and placing the M hydroxide precursor / NF at the downstream of a tubular furnace, placing sublimed sulfur powder at the upstream of the tubular furnace, and carrying out heating and heat preservation reaction through the tubular furnace to obtain an M-S / NF catalyst, namely the high-entropy sulfide catalyst. The catalyst provided by the invention has efficient HER and SOR activities, and can be applied to sulfur ion oxidation assisted water electrolysis for efficient energy-saving hydrogen production.

The application belongs to the field of water oxidation catalyst preparation, and discloses a sulfur-doped Fe3O4-FeNi3 / CN bimetallic composite catalyst, a preparation method thereof and application of the catalyst in electrolytic water oxygen evolution. Polyaniline, ferric nitrate, nickel nitrate and sublimed sulfur are mixed, and high-temperature pyrolysis is performed, wherein the molar ratio of ferric nitrate to nickel nitrate is 3:1 to 1:3; the sulfur-doped bimetallic composite catalyst Fe3O4-FeNi3-S / CN is prepared by high-temperature pyrolysis at 400-700 DEG C. The application investigates the influence of the amount of sublimed sulfur on the FeNi3 crystalline phase of the catalyst, finds that the activity of the catalyst increases with the increase of the FeNi3 crystalline phase and the catalyst cannot be over-sulfided into sulfide, and finally realizes good synergistic catalytic effect, so as to optimize the performance and stability of the oxygen evolution reaction.

The present invention discloses a FePcF 16 / oxidized fruit residue carbon sulfur fixation material and its preparation method, sulfur fixation method and lithium-sulfur battery cathode material, wherein: the preparation method of the sulfur fixation material includes the steps of: 1. preparing fruit residue carbon APC; 2. preparing oxidized fruit residue carbon OAPC; 3. preparing FePcF 16 / oxidized fruit residue carbon sulfur fixation material; the sulfur fixation method includes the steps of: mixing the FePcF 16 / oxidized fruit residue carbon sulfur fixation material with sublimed sulfur S8, grinding and then placing it in a hydrothermal reaction kettle, heating to 140-180 °C and keeping warm, and after naturally cooling to room temperature, obtaining the cathode material of the lithium-sulfur battery after sulfur fixation. The phthalocyanine containing an electron-withdrawing group in the present invention is combined with oxidized fruit residue carbon, showing excellent performance in anchoring and catalytic conversion of polysulfide lithium, improving its catalytic conversion efficiency and the utilization rate of active substance S, effectively inhibiting the occurrence of the shuttle effect, enabling the lithium-sulfur battery to exhibit stable cycling performance and high Coulomb efficiency under high current, and moreover, the preparation process is simple, has high repeatability and controllable morphology, which is beneficial to large-scale production.

The application discloses a preparation method of concentration-dependent red light sulfur quantum dots and the red light sulfur quantum dots. The preparation method comprises the following steps: grinding, and reacting with sublimed sulfur, inorganic alkali and a heterocyclic functional reagent as raw materials and hydrogen peroxide as an etching agent; and then performing dialysis and freeze-drying to obtain the red light sulfur quantum dots. The heterocyclic functional reagent is a nitrogen-containing heterocyclic compound, and is at least one of 2-aminothiazole, imidazole-2-formaldehyde and 2-aminooxazole. The three SQDs all have concentration dependence, and the optimal emission wavelength is gradually red-shifted with the increase of the SQD concentration, and the maximum red shift is 130 nm. The maximum emission wavelength of the prepared SQDs can reach 690 nm, which indicates that the SQDs are red light emission fluorescent nanomaterials, and the fluorescence wavelength red shift can be attributed to non-radiative transition due to molecular assembly at a high concentration, i.e. fluorescence resonance energy transfer, and production of new emission centers. The application provides a new strategy for the research of concentration-dependent nanomaterials and red light emission SQDs.

This invention relates to the field of composite nanowire preparation technology, specifically to a nickel sulfide / titanium dioxide composite nanowire, its preparation method, and its application: Using nickel-titanium-based nanowires obtained by nickel ion exchange of Na2Ti3O7 nanowires as raw material, the nickel-titanium-based nanowires are mixed with sublimed sulfur and then subjected to a two-step heating process to prepare nickel sulfide / titanium dioxide composite nanowires. The nickel sulfide / titanium dioxide composite nanowires obtained by this technical solution have a regular morphology and uniform distribution of nickel sulfide and titanium dioxide, which can effectively enhance the adsorption of discharge intermediate products by the positive electrode carrier of lithium-sulfur batteries and accelerate their conversion, thereby improving the electrochemical performance of lithium-sulfur batteries. Furthermore, the process for preparing high specific surface area and highly active polar transition metal composite materials using this technical solution is simple and easy to produce.