49 results about "Bismuth sulfide" patented technology

The invention relates to the technical field of photocatalysts, in particular to a bismuth-defect bismuth oxybromide-sulfur-defect bismuth sulfide bromide heterojunction and a preparation method and application thereof in photocatalytic CO2 reduction, Bi (NO3) 3.5 H2O, thiourea, cetyltrimethylammonium bromide (CTAB) and the like are used as raw materials, and the VBi-Bi4O5Br2 / VS-Bi19Br3S27 heterojunction is prepared through a two-step hydrothermal method. According to the VBi-Bi4O5Br2 / VS-Bi19Br3S27 heterojunction, bismuth vacancies and sulfur vacancies are introduced, the visible light absorption range of the material is expanded through a proper amount of double vacancies, more electron capture centers are provided, and the separation efficiency of photo-induced electrons and the vacancies is improved, so that the VBi-Bi4O5Br2 / VS-Bi19Br3S27 heterojunction has excellent performance of photocatalytic reduction of CO2, and the preparation method of the VBi-Bi4O5Br2 / VS-Bi19Br3S27 heterojunction is suitable for large-scale production and application of the VBi-Bi4O5Br2 / VS-Bi19Br3S27 heterojunction. CO2 can be reduced into a single product CO, and the photoreduction efficiency of the carbon dioxide can be improved.

This invention relates to the field of adsorbent technology, and discloses a PANIBi2S3 nanocomposite material, its preparation method, and its application. The composite material is polyaniline-coated bismuth sulfide; the bismuth sulfide has a nanoflower morphology. The nanocomposite material obtained by this invention has good iodine adsorption capacity.

The present invention provides a bismuth sulfide which is easy to reflect infrared rays and has a blackness equivalent to or higher than that of carbon black. The present invention is a bismuth sulfide particle including agglomerated secondary particles formed by agglomeration of primary particles, and having a cumulative 50% particle diameter (D1) of 0.2 μm or more and 10 μm or less in a volume cumulative distribution measured by a laser diffraction / scattering particle size distribution measuring device. The present invention includes a process of heating a bismuth compound and a sulfur compound in a dispersion medium in the presence of a protective agent at 30°C or higher and 100°C or lower.

The invention discloses a preparation method and application of an S-type gold / molybdenum disulfide / bismuth sulfide heterojunction photosensitizer, and relates to a preparation method and application of a photosensitizer. In order to solve the problem of limited catalytic activity of the existing nano-enzyme-based therapy, the S-type Au / MoS2 / Bi2S3 heterojunction is prepared by adopting a two-step hydrothermal method, and under the radiation of near-infrared light, the heterojunction retains electron and hole pairs with strong redox properties through recombination of photon-generated carriers. The Au / MoS2 / Bi2S3 heterojunction promotes generation of < 1 > O2 while relieving oxygen deficit in tumor cells, so that the Au / MoS2 / Bi2S3 heterojunction can be applied to photothermal-photodynamic combined treatment of cancers. Besides, the prepared heterojunction has multi-enzyme catalytic activity, generation of O2 and. OH and consumption of glucose and glutathione can be promoted at the same time, and tumor proliferation is remarkably inhibited, so that tumor apoptosis is promoted. The method is applied to the technical field of nano material medicine.

The application discloses a flower ball-shaped bismuth disulfide / tungsten disulfide composite material and a preparation method and application thereof. Tungsten hexachloride is added into anhydrous ethanol solution and fully stirred, then bismuth nitrate pentahydrate is added into the mixed solution and stirred to uniformly disperse the bismuth nitrate pentahydrate into the solution, then thioacetamide is added and stirred to be uniform, the obtained solution is moved into a reaction kettle, and the reaction kettle is sealed and placed into a homogeneous reactor; after the reaction is completed, the product is taken out, washed and fully dried in a vacuum oven to obtain the composite material. The composite material has a thickness of 20-30 nm, and nanosheets are vertically grown on a self-assembled flower ball-shaped structure with a diameter of 350-400 nm; the composite material can be applied to preparation of a potassium ion battery negative electrode material, and the structure is more stable, the conductivity is better, and the electrochemical performance is greatly improved.

The invention provides an I2 / Bi2S3 (at) C composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: step 1, stirring a carbon source, ammonium persulfate, bismuth salt, a sulfur source and polyvinylpyrrolidone to obtain a mixed solution; 2, putting the mixed solution into a reaction kettle for heating reaction, and then putting a reaction product into a tubular furnace for calcining to obtain Bi2S3 at C; and 3, heating the Bi2S3 (at) C and iodine in a closed reaction kettle, and carrying out steam adsorption on the iodine by the Bi2S3 (at) C to obtain the I2 / Bi2S3 (at) C composite material. According to the preparation method, bismuth sulfide is doped on carbon, so that the adsorption capacity and the iodine fixation capacity on iodide ions are improved; the I2 / Bi2S3 (at) C after adsorbing the iodine steam is applied to the positive electrode of the aqueous zinc-iodine battery, so that the battery has the advantages of high specific capacity, slow specific capacity attenuation, good battery stability and the like.

This invention provides a method for extracting bismuth from bismuth-containing oxygen pressure conversion leaching residue, belonging to the field of non-ferrous metal metallurgical technology. In this invention, dilute sulfuric acid is added as a leaching agent to bismuth sulfide concentrate for mixing and slurry preparation, while a surfactant is added to obtain a mixed slurry. Oxygen is then introduced to perform oxygen pressure conversion leaching on the mixed slurry, yielding bismuth-containing oxygen pressure conversion leaching residue. This residue is then mixed with an alkaline solution for alkaline conversion and solid-liquid separation, yielding a conversion solution and bismuth oxide residue. Finally, the bismuth oxide residue is mixed with an acidic solution for acidic bismuth extraction and solid-liquid separation, yielding a bismuth-rich leachate and bismuth extraction residue. This invention converts bismuth sulfide into easily acid-soluble bismuth oxide, increasing the flexibility of the hydrometallurgical system selection for low-grade bismuth sulfide concentrate and enabling selective extraction of bismuth at ambient temperature and pressure. Compared to direct chlorination leaching of bismuth sulfide concentrate, the bismuth-rich leachate has a lower concentration of impurity ions such as iron, requiring less purification and impurity removal pressure.

The invention belongs to the technical field of lubricating materials and particularly relates to wide-temperature-range lubricating grease for a helicopter transmission system as well as a preparation method and application of the wide-temperature-range lubricating grease. The wide-temperature-range lubricating grease for the helicopter transmission system comprises the following components: base oil, a thickening agent, a tribological property improver, an antioxidant, an adhesive and an antirust agent, the tribological performance improver is prepared from oxymolybdenum thiodibutyl dithiocarbamate, antimony dibutyl dithiocarbamate, tricresyl phosphate and bismuth sulfide according to the mass ratio of (3 to 5) to 1 to (1 to 3) to (0.1 to 1.5). The wide-temperature-range lubricating grease for the helicopter transmission system, provided by the invention, has outstanding high-temperature oxidation resistance, excellent extreme-pressure wear resistance and high-temperature performance and excellent low-temperature starting and operating torque, and can meet the use requirements of a lubricating grease product for the helicopter transmission system on wide temperature range and high load.

The invention relates to a carbon nanotube loaded tantalum monatomic doped bismuth sulfide catalyst as well as a preparation method and application thereof, and aims to solve the problems that the yield of H2O2 prepared through electro-catalysis of an existing bismuth-based catalyst is relatively low, and the selectivity of H2O2 is relatively low. The preparation method comprises the following steps: 1, dispersing trimesic acid, tantalum pentachloride and bismuth nitrate pentahydrate in methanol, and carrying out solvothermal reaction at 110-140 DEG C to obtain a tantalum-doped bismuth metal organic framework material; 2, grinding and mixing the tantalum-doped bismuth metal organic framework material and dibenzyl disulfide to obtain a mixture; and 3, in an argon atmosphere, heating to 750-950 DEG C, and carrying out heat preservation carbonization treatment. The bismuth sulfide catalyst prepared by the method shows H2O2 selectivity of more than 90% in a wide voltage range of 0-0.65 V, and the H2O2 yield can reach 8.76 mol.g <-1 >. H <-1 > under the industrial-grade current density of 75 mA / cm < 2 >.

The invention belongs to the technical field of gas sensors, and discloses a visible light excitation type nitrogen dioxide gas sensor based on a Bi2S3 / SnS2 heterostructure and preparation and application thereof, and the gas sensor comprises a gas sensitive material, an interdigital electrode and an LED light source. The preparation method specifically comprises the following steps: preparing bismuth sulfide with the microstructure of a nanorod structure and tin disulfide with the microstructure of a micron sheet structure by adopting a hydrothermal method to form a heterostructure composite material, uniformly coating the gas sensitive material on the surface of an interdigital electrode taking an aluminum oxide substrate as a substrate, and vertically placing an LED light source right above the gas sensitive material. The invention has the advantages of low price, simple preparation process, compatibility with CMOS (Complementary Metal Oxide Semiconductor) process, easiness in microminiaturization and integration with other microelectronic devices and the like.

The application discloses a kind of double-defect composite photocatalyst and synthesis method and application thereof, it is related to photocatalytic technology field.The composite photocatalyst prepared by the application is non-metallic double-defect composite photocatalyst, including sulfur vacancy bismuth sulfide and the selenium vacancy zinc selenide attached to the surface of sulfur vacancy bismuth sulfide, and the selenium vacancy zinc selenide and sulfur vacancy bismuth sulfide form heterostructure;The composite photocatalyst under visible light irradiation, high-efficiency degradation of tartaric acid varenicline in water, degradation efficiency is high, degradation rate is fast, and can effectively reduce the pollution of tartaric acid varenicline to water environment, still can maintain higher catalytic activity after multiple cycle degradation.The composite photocatalyst provided by the application has simple preparation process, and the application effect is remarkable, provides a new technical path and data support for the efficient treatment of tartaric acid varenicline and other drug pollutants in water.

The application relates to the technical field of electromagnetic wave absorbing materials, and provides a preparation method and application of a bismuth sulfide-reduced graphene oxide composite material. The main purpose is to solve the problems of high cost, environmental pollution and insufficient absorption capacity of single material of traditional metal material absorbers. The main scheme comprises the following steps: synthesizing graphene oxide nanosheets, taking ethylene glycol as a solvent medium, taking polyvinylpyrrolidone K30 as a surfactant, adding bismuth nitrate pentahydrate and thiourea, and in-situ preparing the bismuth sulfide-reduced graphene oxide composite material through a solvothermal reaction. The application is used for electromagnetic functional materials, including microwave absorbing materials and electromagnetic shielding materials. The composite material is used as a filler and mixed with paraffin or epoxy resin to be coated on the surface of a protected object, so that electromagnetic wave absorption and shielding are realized.

The invention provides a copper sulfide / bismuth sulfide deposited bismuth vanadate / titanium dioxide composite photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: step 1, preparing a TiO2 nanorod film on a conductive substrate by taking tetrabutyl titanate as a titanium source and hydrochloric acid as a solvent through a hydrothermal method; step 2, preparing a bismuth-deposited bismuth vanadate TiO2 nanorod film from the TiO2 nanorod film prepared in the step 1 through a hydrothermal method, and annealing to obtain a bismuth-deposited bismuth vanadate / titanium dioxide hierarchical structure film; step 3, mixing to obtain a precursor solution of sulfur copper sulfide; step 4, putting the bismuth-deposited bismuth vanadate / titanium dioxide hierarchical structure film prepared in the step 2 into the precursor solution prepared in the step 3; and carrying out hydrothermal reaction to obtain the composite photocatalyst. According to the method, Bi-BiVO4 is combined to optimize the energy band structure of TiO2, then CuS nanoparticles are introduced to construct double active sites, and synergistic enhancement of wide spectrum absorption and efficient carrier separation is achieved.

This invention discloses a method for preparing a substrate-free bismuth sulfide-based heterojunction thin film and its application in a flexible self-driven photodetector. The heterojunction is composed of hierarchically structured Bi₂S₃ nanofibers and ZnO nanorods, with ZnO nanorods densely coating the surface of ultralong one-dimensional Bi₂S₃ nanofibers, forming a unique brush-like microstructure. The bismuth sulfide-based thin film is self-assembled from interwoven Bi₂S₃ / ZnO heterojunction nanofibers, requiring no substrate support. The unique brush structure formed by this invention not only exhibits a light-trapping effect, effectively improving light absorption utilization, but its heterojunction interface also significantly suppresses the recombination of photogenerated carriers. The detector constructed based on this substrate-free thin film exhibits excellent self-driven detection performance for ultraviolet to infrared light under zero bias, and maintains stable detection capability under bending conditions. This substrate-free flexible broadband detector has significant application prospects in the field of wearable electronics.

The application discloses a preparation method of a bismuth sulfide nanorod / bismuth oxybromide composite photocatalytic material. The method adopts a hydrothermal method, first prepares a bismuth sulfide precursor, and then grows the bismuth sulfide nanorod / bismuth oxybromide composite material through hydrothermal growth after the bismuth sulfide precursor is uniformly stirred with bismuth nitrate pentahydrate and sodium bromide. The composite material has a unique nano structure and good photocatalytic performance by adjusting the mass of the bismuth sulfide precursor in the composite material. When 2 mmol of bismuth oxybromide and 0.05 g of the bismuth sulfide precursor are used to hydrothermally synthesize the bismuth sulfide nanorod / bismuth oxybromide composite material, the composite material has the optimal rhodamine B removal performance, and the removal rate can reach 99.2% after 30 min of dark adsorption and 15 min of photocatalytic reaction; meanwhile, the bismuth sulfide nanorod / bismuth oxybromide composite photocatalytic material also has good removal effects on tetracycline, methyl orange and other organic pollutants.

The present application relates to a kind of processing bismuth sulfide wrapped fine gold ore method, belong to precious metal and non-ferrous metal recovery technical field.A kind of processing bismuth sulfide wrapped fine gold ore method, bismuth gold ore containing bismuth sulfide powder is prepared into ore pulp with water, the bismuth sulfide in ore is reacted to generate gaseous hydrogen sulfide, bismuth ion-containing solution and solid gold concentrate containing precious metal gold with ore pulp and leaching agent mixing;Collect gaseous hydrogen sulfide, and make it subsequently with the bismuth ion-containing solution obtained above reaction to generate bismuth sulfide;Extract metal gold in solid gold concentrate.The present application uses inorganic acid to separate gold bismuth, opens bismuth mineral package, releases gold mineral, and then uses own product to change reaction condition and carries out regeneration reaction, in this process not only enriches and recycles bismuth concentrate, but also regenerates gold bismuth separation leaching agent, saves production cost, and reaction process has no waste release.

The application belongs to the technical field of catalyst synthesis and energy chemical industry, and particularly relates to a preparation method of a low-coordination-number Bi catalyst and application of the low-coordination-number Bi catalyst in electrocatalytic carbon dioxide reduction. The application takes bismuth sulfide as a precursor, performs secondary solvent thermal treatment on the precursor by using a sulfur-containing reagent to induce structural rearrangement of the precursor, and guides in-situ reconstruction of the precursor under subsequent electrochemical conditions, so as to form a bismuth-based active structure with a low-coordination-number characteristic. Compared with the prior art, the application can effectively control the reconstruction rate and structural evolution path of the bismuth-based material, improve the catalytic activity, is suitable for electrocatalytic carbon dioxide reduction, and has a good application prospect.

This invention discloses a method for preparing and applying a multi-dimensional composite material of bismuth sulfide nanoneedles grown on multi-walled carbon nanotubes / bismuth sulfide from sea urchins, belonging to the field of semiconductor functional materials technology. The purpose of this invention is to solve the problems of existing bismuth sulfide materials used as gas-sensitive materials, such as high operating temperatures, low sensitivity, high resistivity, and low conductivity. The method includes: 1. Preparation of a hydrothermal reaction solution; 2. Hydrothermal reaction; 3. Product collection and processing. The multi-walled carbon nanotube-grown bismuth sulfide nanoneedles / bismuth sulfide from sea urchins multi-dimensional composite material is used as a room-temperature sensitive material for H2S. This invention obtains an H2S sensor by printing the multi-walled carbon nanotube-grown bismuth sulfide nanoneedles / bismuth sulfide from sea urchins multi-dimensional composite material onto a ring electrode. It exhibits excellent sensitivity to H2S at room temperature, with a measurement range of 10 ppb to 5 ppm, enabling trace H2S detection. It can be widely applied in trace H2S detection in fields such as H2S storage, food safety, and chemical engineering.

The application relates to a preparation method of a bismuth sulfide / bismuth vanadate heterojunction array of a laminated building block structure, and belongs to the field of photoelectric semiconductor materials, and particularly relates to a preparation method of a bismuth sulfide / bismuth vanadate heterojunction array. The method aims to solve the problem that the single-component bismuth vanadate prepared by the existing method is not conducive to the transmission of photo-generated carriers and the full utilization of sunlight, and thus results in a low photoelectric current density. The method comprises the following steps: S1, preparing a ZnO seed layer on an FTO conductive substrate; S2, preparing a bismuth vanadate array; S3, calcining; and S4, preparing a bismuth sulfide / bismuth vanadate heterojunction. The bismuth sulfide / bismuth vanadate heterostructure prepared by the in-situ anion exchange growth method is a laminated building block structure, the regular and dense building block structure is formed around the bismuth vanadate nanorod, the bismuth sulfide intersecting nanorods are uniformly stacked around the bismuth vanadate nanorod, the bismuth sulfide / bismuth vanadate heterostructure is conducive to light absorption and the transmission of photo-generated charge carriers, and thus a very high photoelectric current density is obtained. The application is used for preparing a bismuth sulfide / bismuth vanadate heterojunction array.

The invention discloses bismuth sulfide-chitosan composite hydrogel as well as a preparation method and application thereof, and belongs to the field of radioactive wastewater treatment. The preparation method comprises the following steps: adding a hydrochloric acid solution into a chitosan aqueous solution, and uniformly mixing to obtain a chitosan acid solution; adding flower-like bismuth sulfide or tubular bismuth sulfide into the chitosan solution, and ultrasonically dispersing uniformly to obtain a mixed solution; and adding glutaraldehyde into the mixed solution, heating in a water bath at 30-50 DEG C to carry out a cross-linking reaction, and washing and freeze-drying a product after the reaction is completed to obtain the flower-like bismuth sulfide-chitosan composite hydrogel or tubular bismuth sulfide-chitosan composite hydrogel. The bismuth sulfide-chitosan composite hydrogel can effectively adsorb and separate IO3 <-> from a high-content coexisting anion system, and the problem that an existing adsorbent for removing radioactive iodine is poor in anti-interference capacity can be effectively solved.

The present invention belongs to the field of antibiotic detection, and in particular to a method for detecting tetracycline in meat products based on a copper-activated upconversion bismuth molybdate sensing system. The steps are: preparing upconversion nanomaterials and rhodamine derivatives, dissolving the two in methanol to obtain two solutions and mixing them in proportion to construct a sensing system. At the same time, the present invention synthesizes a bismuth molybdate-bismuth sulfide complex by a solvent thermal method, effectively improving the decomposition efficiency of tetracycline and copper ion-tetracycline complex in the solution, and shortening the reaction time. By decomposing the copper ion-tetracycline complex and tetracycline, the remaining tetracycline in the complex and the solution can be avoided from continuing to react with the copper ion, further avoiding the interference of the subsequent reaction on the upconversion fluorescence signal, reducing the detection limit of the method, and improving the detection accuracy. In summary, the present invention provides a novel tetracycline detection method, which does not require expensive instruments, reduces the detection cost, can be used for the detection of actual samples, and has broad application prospects.

The application relates to application of bismuth sulfide in preparation of gamma-valerolactone through catalytic hydrogenation of leucic acid, in particular to a method for preparing gamma-valerolactone through photocatalytic hydrogenation of leucic acid by using bismuth sulfide, wherein isopropyl alcohol is used as a hydrogen donor and a solvent, bismuth sulfide non-noble metal photocatalyst synthesized by a solvent thermal method is used, and a low-pressure mercury lamp is used to efficiently catalyze leucic acid to prepare gamma-valerolactone under an argon atmosphere and at room temperature. The application efficiently completes the conversion from leucic acid to gamma-valerolactone under illumination, and the yield of gamma-valerolactone can reach 59% at most after 37 hours of reaction. The application has the characteristics of mild conditions, clean and non-polluted reaction process, low price and environmental friendliness.

This invention discloses an electrode material, its preparation method, and a lithium-ion battery. The electrode material comprises bismuth sulfide, a carbon layer coated on the surface of the bismuth sulfide, a nitrogen layer coated on the surface of the carbon layer, and a nitrogen-carbon layer coated on the surface of the nitrogen layer. This invention forms the electrode material by sequentially coating the surface of bismuth sulfide with a carbon layer, a nitrogen layer, and a nitrogen-carbon layer. The carbon layer, acting as a skeletal support, effectively alleviates the significant stress on the bismuth sulfide during charging and discharging, reduces the volume change of the bismuth sulfide, and thus improves the cycle stability of the bismuth sulfide. The nitrogen layer effectively reduces the side reactions between the bismuth sulfide and the electrolyte, thereby reducing the battery's self-discharge rate and increasing its energy density, resulting in a more stable and longer battery life. The nitrogen-carbon layer enhances the charge transfer rate during charging and discharging and helps improve the conductivity and structural stability of the bismuth sulfide during repeated lithiation / delithiation processes.

This invention discloses a method for preparing a titanium dioxide / silica / bismuth sulfide composite aerogel material, specifically: Step 1, preparing bismuth sulfide; Step 2, at room temperature, mixing and stirring tetraethyl orthosilicate, anhydrous ethanol, deionized water, and glacial acetic acid to obtain solution A; dispersing bismuth sulfide and tetrabutyl titanate in anhydrous ethanol to obtain solution B; stirring and mixing anhydrous ethanol, deionized water, and acetic acid to obtain solution C; Step 3, under continuous stirring, sequentially adding solutions C, A, and DMF to solution B to form a sol; after the sol transforms into a wet gel, transferring it to a reaction vessel, adding n-hexane to immerse the wet gel, carrying out a solvothermal reaction, and drying at room temperature to obtain the final product. The material prepared by this method has a controllable pore structure and a large specific surface area, exhibits strong adsorption and visible light degradation capabilities for organic dyes, and demonstrates good stability in use.

The application provides a method for separating copper, zinc and bismuth from bismuth sulfide concentrate, and belongs to the technical field of non-ferrous metallurgy. The bismuth sulfide concentrate, a surfactant and water are mixed to obtain mixed slurry; then oxygen is introduced to perform oxygen pressure conversion leaching and solid-liquid separation on the mixed slurry to obtain a copper / zinc-containing leaching solution and a bismuth-containing leaching residue. Compared with the traditional copper / zinc and bismuth flotation separation process, the application does not use highly toxic reagents such as cyanide, can efficiently leach copper / zinc, realizes deep separation of copper / zinc and bismuth, and creates favorable conditions for subsequent recovery of copper / zinc and bismuth. The copper / zinc-containing leaching solution obtained by the application can directly recover copper / zinc through an extraction process after adjusting the pH value, thereby avoiding the problem of low-grade matte recovery difficulty in the traditional bismuth pyrometallurgical process; the copper / zinc content in the bismuth-containing leaching residue is low, and the bismuth grade is improved, which is beneficial to shortening the crude bismuth refining process and improving the efficiency of fire bismuth smelting.

The application discloses a kind of sulphur vacancy's cadmium sulfide bismuth vanadate composite photo-thermal catalyst and preparation method and application, the method includes the following steps: in nitric acid solution, add bismuth nitrate pentahydrate and ammonium metavanadate and mix uniformly, the mass ratio of bismuth nitrate pentahydrate and ammonium metavanadate is 97:23, obtain mixed solution;Hexadecyltrimethylammonium bromide and NaHCO3 are added in mixed solution and mix uniformly, keep warm at 80~140 ℃, then collect product, dry again to obtain bismuth vanadate;Bismuth vanadate, thioacetamide and cadmium source are mixed uniformly in deionized water, the molar ratio of thioacetamide and cadmium source is (0.5~1.5):1, keep warm and treat at 140~200 ℃, then collect product, dry again to obtain sulphur vacancy's cadmium sulfide bismuth vanadate composite photo-thermal catalyst, easy to operate, raw material is easy to obtain, low in cost, less in energy consumption, good in stability, high in activity, high in the efficiency of photo-thermal reforming PLA hydrolysate.

The application relates to a preparation method and application of a copper-doped bismuth sulfide catalyst, and belongs to the field of electrochemical catalysis. The preparation method comprises the following steps: in the first step, bismuth salt and copper salt are dissolved in a mixed solution of methanol and N,N-dimethylformamide to serve as precursor A, and 3-mercapto-1 propane sulfonic acid sodium (MPS) is dissolved in a mixed solution of methanol and N,N-dimethylformamide to serve as precursor B. In the second step, a high-pressure piston pump is used to pump the precursors A and B into a premixer, the precursors are preheated through a preheating pipeline, and then enter a micro-channel reactor and react. In the third step, the catalyst is collected, cleaned and dried. The catalyst has porous nano corrugations on the surface and a hollow structure in the inside, has a larger specific surface area and electrochemical active area compared to general catalysts, exposes more active sites, and improves the catalytic activity. The catalyst can be applied to electrocatalytic reduction of carbon dioxide to generate formic acid, the preparation operation is simple, the cost is low, the catalyst has industrial amplification feasibility, high practical value and high popularization value.

The invention discloses ternary inorganic sulfide lanthanum bismuth sulfide and a powder preparation method thereof, the chemical formula of the lanthanum bismuth sulfide is BiLa8S12, and the lanthanum bismuth sulfide has wide-spectrum optical transmission performance and high-melting-point performance. The preparation method of the sulfur lanthanum bismuth powder comprises the following steps: preparing a bismuth halide additive or a bismuth sulfide additive by taking lanthanum compound alpha-La2S3 or lanthanum polysulfide LaS2 powder as a raw material, and mixing the raw material and the additive to prepare a precursor of the sulfur lanthanum bismuth powder; and putting the prepared precursor mixture powder into an improved ball milling tank, carrying out mechanochemical reaction in a protective gas environment, and separating out the powder after ball milling is finished, so as to obtain the BiLa8S12 powder. Compared with other lanthanum sulfide-based compounds, the BiLa8S12 compound provided by the invention has obviously higher thermodynamic stability and oxidation resistance.

The application relates to a preparation method of a carbon-doped TiO2 / bismuth sulfide composite material and application thereof in electrochemical corrosion prevention. The carbon-doped TiO2 / bismuth sulfide composite material is prepared from a titanium metal organic framework through a low-temperature one-step hydrolysis method. The photoanode constructed by the composite material generates photo-induced electrons which migrate and enrich to the surface of the protected metal under illumination, so that the metal cathode is polarized to reach a thermodynamic stable state, and then the metal corrosion is inhibited, thereby constructing a metal corrosion prevention method of photoelectrochemical cathode protection. The combined modification method of carbon doping and composite narrow-band-gap bismuth sulfide semiconductors is adopted to overcome the defects of titanium dioxide, such as only absorbing ultraviolet light and photo-induced electron-hole easy recombination.

This invention discloses a method for fabricating a bismuth sulfide thin film and its application in a photodiode. The method for fabricating the bismuth sulfide thin film includes: providing a Bi₂S₃ precursor solution; coating the Bi₂S₃ precursor solution onto a substrate; placing the substrate coated with the Bi₂S₃ precursor solution in a nitrogen atmosphere, first annealing at a low temperature until the solvent evaporates completely, and then annealing at 280±5℃ until surface defects of the bismuth sulfide thin film are eliminated. The Bi₂S₃ thin film prepared by this method has a very smooth surface with a surface roughness of only about 2 nm, which is very advantageous for the fabrication of thin-film diode devices. This method can be used to prepare a bismuth sulfide thin film on an electron transport layer as a light-absorbing active layer; then, a hole transport layer can be prepared on the bismuth sulfide thin film, thereby obtaining a diode-type photodetector with high light absorption capacity, high carrier mobility, and high light-dark current ratio.