439results about "Binary selenium/tellurium compounds" patented technology

The invention belongs to the field of resource regeneration, and particularly relates to a method for separating and recycling copper, indium, gallium and selenium from a waste solar thin film battery. According to the method, the waste solar thin film cells are subjected to oxidizing roasting, deep eutectic leaching and extraction and reverse extraction, and high-quality conversion and purification of all valuable elements in the waste solar thin film cells to oxides of the valuable elements are achieved. According to the method, the process route is simple, high-selectivity extraction of indium is achieved through the synergistic effect of the deep eutectic solvent and P204, and meanwhile effective recovery of valuable elements such as copper and selenium is achieved. The recovered and prepared oxide can be widely applied to strategic emerging industries such as semiconductors, photovoltaics, aerospace, military and the like.

The invention discloses an Ag2Se-based thermoelectric material and a preparation method thereof, and belongs to the technical field of thermoelectric materials. The preparation method comprises the steps that Ag powder and Se powder are mixed and ground according to the molar ratio of (1.9-2.1): 1, and mixed powder is obtained; the mixed powder is subjected to cold pressing to form blocks, and prefabricated blocks are obtained; the prefabricated block is subjected to heat preservation for 20-120 minutes under the conditions that the pressure is 1-5 GPa and the temperature is 400-1000 DEG C, and an Ag2Se initial product is generated through reaction; crushing the primary product, and grinding into fine powder; and sintering the fine powder for 5-30 minutes under the conditions that the pressure is 1-5 GPa and the temperature is 300-900 DEG C, so as to obtain the composite material. The sample is prepared through high temperature and high pressure for the first time, the method is simple, operation is easy to control, the preparation period can be greatly shortened, and the energy utilization rate is increased; the electroacoustic transport performance of Ag2Se is effectively regulated and controlled by changing the pressure and the temperature, and finally the thermoelectric performance is effectively improved.

The invention discloses a bismuth telluride nanopore maskless direct writing preparation method based on electron beam irradiation, and belongs to the technical field of nanometer manufacturing. The method comprises the following steps: firstly, constructing an initial nanopore in a two-dimensional bismuth telluride material by utilizing a converged electron beam; and then the aperture size of the nanopore is accurately regulated and controlled by adjusting the beam density of the electron beam. The method effectively solves the key technical bottlenecks of interface chemical residue pollution caused by a traditional photoresist mask process, intrinsic defect formation caused by high-energy particle bombardment and the like, and breaks through the limitation of an existing etching technology in the aspect of sub-nanoscale structure precision control; precise control of the aperture of the nanopore can be achieved by adjusting the irradiation intensity of the electron beam, and the method has the advantages of being easy and convenient to operate, low in cost, environmentally friendly and the like and can be widely applied to the fields of nanometer electronic devices, sensors and the like.

The invention relates to the technical field of new energy materials, in particular to a thermoelectric composite material and a preparation method and application thereof.The thermoelectric composite material comprises 2D TMDs, a P-type semiconductor polymer and a conductive polymer, the P-type semiconductor polymer and the conductive polymer are cross-linked to form a composite conductive polymer, and the 2D TMDs are dispersed in the composite conductive polymer. The composite conductive polymer has the effects of forming a thermoelectric loop, regulating and modifying the interface of the 2D TMDs and protecting the 2D TMDs dispersed in the composite conductive polymer, and the 2D TMDs and the P-type semiconductor polymer convert heat energy into electric energy under the Seebeck effect. The thermoelectric building material additive comprises a thermoelectric composite material combined on an inorganic silica gel carrier. The thermoelectric cement-based material comprises cement and a thermoelectric building material additive. The thermoelectric cement-based material has good thermoelectric performance, stability and durability, and is suitable for scenes with obvious temperature difference or urgent energy recovery requirements.

The invention discloses a sodium-based high-entropy sulfide solid electrolyte as well as a preparation method and application thereof, and belongs to the technical field of solid electrolyte materials. Through high-entropy design and in combination with process innovation: microwave rapid sintering and interface / coating collaborative process optimization, high ionic conductivity (gt; 8 * 10 <-3 > S / cm), and long cycle stability (gt; and the grain boundary impedance is reduced by 72%. In the preparation method of the sodium-based high-entropy sulfide solid electrolyte, volatilization of sulfur is avoided through high-energy ball milling and microwave rapid sintering; a 5T superconducting magnetic field is used for inducing oriented growth; crystal grains are preferentially arranged along a crystal face, so that the ion transmission anisotropy is improved; interface engineering processing is carried out, and interface impedance is reduced; and the interface wettability and the mechanical strength are improved by adopting dynamic coating.

The invention provides a method for recycling valuable metal from germanium-antimony-tellurium alloy waste. The method comprises the three steps of surface treatment, chlorine reaction and compartment condensation and discharging. Oxidation films on the surfaces of the waste materials are removed through surface treatment, and the subsequent chlorine reaction efficiency is improved; then a self-made chlorination-step condensation integrated device is utilized, germanium, antimony and tellurium react with chlorine at the high temperature to generate gaseous chloride, step-by-step condensation separation is achieved through partition temperature control based on the boiling point difference of tellurium tetrachloride, antimony pentachloride and germanium tetrachloride, and target products are collected respectively; and finally, introducing inert gas to purge residual chlorine, and discharging safely. The method has the advantages of short process flow, no need of complex wet process steps and low equipment investment; metal chlorides are efficiently separated through the integrated device, and recovery is thorough; and the pyrogenic process is mainly adopted, no wastewater is generated, only tail gas is treated in a compliance manner, and the method is environment-friendly. Compared with a traditional wet process, the method has the remarkable advantages of high efficiency, low cost, environment friendliness and the like.

The invention discloses a heterostructure sodium ion battery negative electrode material and a preparation method and application thereof, and belongs to the technical field of sodium ion batteries. The method comprises the following steps: (1) dissolving a carbon source, tin salt and antimony salt in a solvent to obtain a precursor solution; the carbon source is a nitrogen-containing organic compound; (2) removing a solvent in the precursor solution to obtain precursor powder; and (3) in a reducing atmosphere, carrying out gas-phase selenylation treatment by using selenium powder to obtain the sodium-ion battery negative electrode material with the heterostructure SnSe-Sb2Se3, namely the sodium-ion battery negative electrode material with the heterostructure. The method is simple and easy in process, good in repeatability and easy to adjust and realize industrial production, and the prepared heterostructure sodium ion battery negative electrode material relieves material volume expansion, has excellent sodium storage performance, brings excellent long cycle performance and rate capability, and has wide popularization and application prospects in the fields of electronic equipment, large-scale energy storage and the like.

The invention belongs to the technical field of nano composite materials, and relates to a preparation method of an iron diselenide / nitrogen-sulfur co-doped carbon nanosheet composite material, which comprises the following steps: putting cellulose, sodium bicarbonate and thiourea into a mortar, uniformly grinding, putting into a tubular furnace, calcining at high temperature under the protection of inert gas, naturally cooling, centrifugally separating and collecting the calcined powder, thereby obtaining the iron diselenide / nitrogen-sulfur co-doped carbon nanosheet composite material. The nitrogen and sulfur co-doped carbon nanosheets are obtained; ultrasonically dispersing iron nitrate nonahydrate in ethanol, heating in an oil bath until the ethanol is evaporated to dryness, and carrying out heat treatment to obtain an iron-based precursor; the obtained iron-based precursor, selenium dioxide and nitrogen and sulfur co-doped carbon nanosheets are ultrasonically dispersed in benzyl alcohol, the mixture is transferred into a reaction kettle with a polytetrafluoroethylene lining, the composite material is obtained after solvothermal reaction, and the morphology of the composite material is that iron diselenide nanoparticles are evenly and densely attached to the surfaces of the nitrogen and sulfur co-doped carbon nanosheets. The method is simple and easy to implement, suitable for large-scale production, easy to implement industrially and expected to be applied to the negative electrode of the hybrid supercapacitor.

The invention relates to a vacancy-assisted tin heterovalent doped bismuth selenide material as well as a preparation method and application thereof, Se vacancy defects existing in VSe-Bi2Se3 are utilized to assist in stable doping of Sn < 4 + > into Bi sites, so that the Sn-VSe-Bi2Se3 material is obtained. As the positive electrode material of the zinc ion battery, the Sn-VSe-Bi2Se3 shows high specific capacity, excellent rate capability and long-acting stable cycle performance, and has the advantages of simple and convenient process, mild conditions and suitability for large-scale production.

The invention relates to the field of inorganic chemical industry production, and discloses a high-purity selenium dioxide continuous production process and equipment, the equipment comprises a cooling crystallization barrel, one side of the cooling crystallization barrel is provided with a selenium dioxide production mechanism, the selenium dioxide production mechanism is used for selenium dioxide production, and the cooling crystallization barrel is provided with a cooling crystallization barrel. An air pressure generation mechanism is arranged outside the cooling crystallization barrel, a gas on-off mechanism is arranged at the top of the air pressure generation mechanism, an air exhaust filtering mechanism is arranged at the top of the cooling crystallization barrel, and a tail barrel is arranged on the side, away from the selenium dioxide production mechanism, of the cooling crystallization barrel; the air pressure generating mechanism is used for keeping the negative pressure state in the cooling crystallization barrel and the tail barrel. According to the selenium dioxide production device, the inside of the feeding pipeline is filled with the materials, so that the materials can be supplemented in time after the materials are consumed, and selenium dioxide can be continuously and efficiently produced, so that the yield and the purity are improved, economic benefits are directly brought, energy waste is avoided, and economic loss is avoided.

The invention relates to the technical field of lithium ion batteries, and particularly discloses an antimony chalcogenide coated lithium cobalt oxide positive electrode material and a preparation method and application thereof.The preparation method comprises the steps that lithium cobalt oxide powder is mixed with an antimony-containing compound, a sulfur-containing compound and a selenium-containing compound in deionized water, and a uniformly-dispersed precursor solution is formed; the molar ratio of the lithium cobalt oxide powder to the compound containing antimony, sulfur and selenium is 1: (0.01-1): (0.01-3): (0.001-2); drying the precursor solution to obtain solid powder; and calcining the solid powder at 100-500 DEG C in a protective atmosphere to finally obtain the antimony chalcogenide coated lithium cobalt oxide positive electrode material. According to the preparation method of the antimony chalcogenide-coated lithium cobalt oxide positive electrode material, the prepared antimony chalcogenide-coated lithium cobalt oxide positive electrode material has good structural stability, and when the antimony chalcogenide-coated lithium cobalt oxide positive electrode material is used in a lithium ion battery, the specific capacity of the lithium cobalt oxide battery under high voltage can be remarkably improved, and the cycle life of the lithium cobalt oxide battery under high voltage can be remarkably prolonged.

The present disclosure relates to the field of nanotechnology. The present disclosure provides a method for preparing nanostructures by fluoride passivation. The present disclosure also provides a method for preparing nanostructures by fluoride and amine passivation. The nanostructures have high quantum yields, narrow emission peak widths, tunable emission wavelengths, and colloidal stability. Nanostructures prepared using the method are also provided. Nanostructure films and molded articles including the nanostructures are also provided.

The invention discloses a one-dimensional tubular selenide-carbon composite material assembled by hollow particles and a preparation method and application thereof.The preparation method comprises the following steps that ZnCo-ZIF nanotubes and 2, 5-dihydroxyterephthalic acid are mixed, N, N-dimethylformamide is added, a reaction is conducted, after the reaction is completed, a product is subjected to centrifugal separation, and the one-dimensional tubular selenide-carbon composite material assembled by the hollow particles is obtained. And washing and drying to obtain the one-dimensional tubular MOF material assembled by the hollow particles. And annealing the MOF material in an argon atmosphere to obtain the one-dimensional porous carbon nanotube material assembled by the hollow particles. And then uniformly mixing with selenium powder, and annealing under argon protection to obtain the one-dimensional tubular selenide-carbon composite material assembled by hollow particles. The method is simple to operate and controllable in process, and the prepared product is widely applied to the fields of energy storage, catalysis, environmental governance, biomedicine and the like.

The invention discloses a nickel-cobalt-selenium (Co1-xNixSe2) nano material for electrocatalytic oxidation of ethylene glycol as well as a preparation method and application of the nickel-cobalt-selenium (Co1-xNixSe2) nano material. The material is prepared by a hydrothermal method which comprises the following steps: (1) pouring 20mL of deionized water containing 475.9 mg of CoCl2. 6H2O into a 1mol / L NaOH solution containing 0.32 g of selenium powder to prepare a precursor solution; (2) placing in a stainless steel autoclave with a polytetrafluoroethylene lining, carrying out hydrothermal reaction at 180 DEG C for 18 hours, washing with absolute ethyl alcohol and deionized water, and carrying out vacuum drying at 60 DEG C to obtain a CoSe2 material; and (3) the molar feeding ratio of CoCl2. 6H2O to NiCl2. 6H2O is adjusted, so that the nickel / cobalt ratio x is 0.25, 0.50 or 0.75, and materials with different components, namely Co < 0.75 > Ni < 0.25 > Se < 2 >, Co < 0.50 > Ni < 0.50 > Se < 2 > and Co < 0.25 > Ni < 0.75 > Se < 2 >, are prepared. The series of materials are applied to ethylene glycol oxidation under the alkaline condition, the catalytic performance of Co < 0.50 > Ni < 0.50 > Se < 2 > is optimal, the current density reaches 111 mA cm <-2 > under the electric potential of 1.6 V vs.RHE, the total Faraday efficiency reaches up to 91.4%, and the application prospect in the field of PET plastic recovery is wide.

A method for manufacturing a fused metal sight window that melts the metal of the frame around the window, instead of the traditional method of melting the window into the frame. Since most of the superior optical transparent materials (such as fused silica, sapphire, YAG, ALON, diamond, fused quartz and magnesium fluoride) have a melting point higher than most metals, it was not previously possible to create fused metal sight windows with these materials. By melting the frame onto the window, many new combinations of metals and optical materials may be used while retaining the strength of the sight window that results from fusing the metal and the window.

The invention relates to the technical field of gas sensors for detecting H2S at room temperature, in particular to a preparation method of a high-sensitivity MoSe2-based gas sensitive material for detecting H2S at room temperature. The high-sensitivity MoSe2-based gas sensitive material for detecting H2S at room temperature is prepared by synthesizing MoSe2 nanoflowers by adopting a hydrothermal method and uniformly loading In2O3 nanoparticles on the surfaces of the MoSe2 nanoflowers by adopting a mechanical mixing method. The preparation method is simple and convenient in process and low in cost, the MoSe2 / In2O3 composite material prepared by the method has a relatively high specific surface area, and an II-type p-n heterojunction interface formed by the composite material effectively promotes separation and migration of current carriers. The response to 0.05 ppm H2S, 0.1 ppm H2S, 0.25 ppm H2S, 0.5 ppm H2S and 1ppm H2S at room temperature (the gas response is calculated according to the formula R = (Rg-Ra) / Ra) is 1.37, 1.47, 1.85, 2.74 and 4.82 respectively, the response is far better than that of an existing pure-phase MoSe2 gas sensitive material, and the working temperature is lower than that of an In2O3 pure-phase material. The research provides an effective method for constructing a gas sensitive material with a large specific surface area and II type p-n heterojunction, and further promotes the development of a gas sensitive technology.

The invention provides a functional coating modified diaphragm as well as a preparation method and application thereof, and belongs to the technical field of lithium batteries. The Zn-doped transition metal selenide is used for modifying the diaphragm, CoSe2 can effectively capture lithium polysulfide and accelerate the oxidation-reduction reaction of sulfur, the CoSe2 is used as a host material to inhibit shuttling of lithium polysulfide and improve the conversion kinetics of lithium polysulfide, and good catalytic ability is shown; after Zn is doped, the concentration of cations is changed in the hydrothermal process, so that a structure which is more beneficial to catalytic reaction can be generated; and the two are combined to play a catalysis-adsorption synergistic effect, so that higher ionic conductivity and better adsorption performance are obtained, and the electrochemical performance of the lithium-sulfur battery is improved.

The invention relates to a surface-modified co-doped lithium-rich manganese-based positive electrode material and a preparation method thereof. The surface-modified co-doped lithium-rich manganese-based positive electrode material comprises a bulk phase part and a surface part, the bulk phase part is a cation co-doped lithium-rich manganese-based material, the chemical formula is Li < 1.2 > Ni < 0.17 > Co < 0.16-x > M < x > Ru < y > Mn < 0.47-y > O < 2 >, in the formula, M is at least one of V, Cr and Fe, x is more than or equal to 0.06 and less than or equal to 0.14, and y is more than or equal to 0.05 and less than or equal to 0.2; the surface part is a selenium-halogen composite modified layer coating the bulk phase part in situ, contains selenide and lithium halide, and is formed by heat treatment of a bulk phase material, a selenium source and a halogen source in an inert atmosphere. The positive electrode material provided by the invention has excellent structural stability and high lithium ion diffusion coefficient, has good interface compatibility with halide electrolyte, and has high energy density and long cycle stability when being used in a halide all-solid-state battery.

The invention relates to the technical field of preparation of electro-catalysis electrode materials, in particular to a preparation method and application of a SeO2 doped RuO2 electrolyzed water catalyst.The preparation method comprises the steps that S1, ruthenium acetate and selenium dioxide are dissolved in deionized water together and continuously stirred to obtain a mixed solution A, then sodium citrate is dissolved in deionized water, and the PH value is adjusted to be 9 with ammonia water to obtain a solution B; s2, mixing the solution A and the solution B, reacting at 80 DEG C for 12 hours, naturally cooling, ultrasonically washing with deionized water and ethanol in sequence, centrifuging, and drying in a drying oven to obtain a catalyst precursor; and S3, carrying out two-step pyrolysis on the precursor, namely heating to 250 DEG C, annealing for 4 hours, heating to 400 DEG C, annealing and heating for 2 hours, so as to obtain the SeO2-doped RuO2 nanosheet. By introducing a proper amount of SeO2 for doping, the electronic structure of RuO2 is optimized, the adsorption and desorption balance effect of the catalyst on a reaction intermediate is adjusted, the Ru site catalytic performance is improved, and the obtained SeO2-doped RuO2 nanosheet has efficient acidic OER catalytic performance.

The invention discloses a tungsten-doped ferroselenide electrocatalyst, a preparation method and application in electrocatalysis, selenium is dissolved in mercaptan and added into an iron source organic amine solution, and a reaction is carried out in an inert gas atmosphere; then adding a tungsten source into the reaction system, and continuously reacting; and collecting a reaction product to obtain the tungsten-doped ferroselenide electrocatalyst. The novel electrolyzed water catalyst is obtained, the cost is low, the electro-catalytic performance is excellent, and a technical solution with wide application prospects is provided for sustainable energy production and clean hydrogen preparation. The preparation method has the characteristics of short synthesis time, simplicity and convenience in operation and easiness in control, and is more efficient compared with a traditional synthesis method.

The invention discloses a preparation method of an ultrathin two-dimensional nanosheet, the ultrathin two-dimensional nanosheet and application of the ultrathin two-dimensional nanosheet, and the preparation method comprises the following steps: (1) mixing a raw material containing a layered solid-phase material I with an intercalator, and carrying out intercalation reaction to obtain an intercalated layered solid-phase material II; and (2) mixing the intercalated layered solid-phase material II obtained in the step (1) with a solvent, and carrying out ultrasonic treatment to obtain the ultrathin two-dimensional nanosheet, the chemical formula of the layered solid-phase material I is MQ2. The material has potential application value in catalysis, energy storage and quantum devices.

The present invention belongs to the field of silicon negative electrode battery materials and specifically discloses a method for preparing a MSe / Si / C composite material. The method comprises mixing M-MOF and a selenium source and performing a calcination reaction to obtain an MSe / C product. The MSe / C is then subjected to a vapor deposition treatment in a silicon source atmosphere to obtain an MSe / Si / C composite material. The M is a transition metal element; and the M-MOF is a metal framework material of a transition metal element. The present invention also provides a material obtained by the preparation method and its application in a battery. The process of the present invention can induce uniform and efficient deposition of silicon, facilitates the in-situ construction of an electronic and ion conduction network of M and Li2Se during the charge and discharge phase, and helps improve the low-temperature fast charging performance of the material.

The invention belongs to the field of two-dimensional material preparation, and particularly relates to a dry transfer method of a corner two-dimensional material. On one hand, introduction of impurities is avoided by adopting a plurality of organic polymers for assistance through a splitting step mechanism; on the other hand, by means of the mechanism that the two-dimensional material slides on the h-BN interface and does not exceed the plane geometrical shape of the h-BN interface, the two-dimensional material is locked on the h-BN geometrical interface through laser cutting, the probability that the two-dimensional material wrinkles, bubbles and slides in the transfer process is remarkably reduced, meanwhile, the internal stress of a system is reduced, and the mechanical performance of the system is improved. Therefore, the accuracy of the transfer angle of the corner two-dimensional material is improved; and the phenomena of slippage, traction and the like do not occur between the corner two-dimensional materials, lattice distortion is also weakened, and the quality of the corner two-dimensional materials is further improved. According to the method, reliable technical support is provided for constructing a high-quality strong-correlation physical platform, and the method can be widely applied to the fields of novel quantum devices and the like.

The present invention relates to the synthesis of pure metal or multi-metal derivatives of ZIF-11, ZIF-12 or amorphous ZIF structures in high yield followed by calcination under inert conditions to produce in composite nanostructures one or more metal selenide dispersed on the surface of or embedded in a carbon matrix, and using these composites as electrodes for lithium ion batteries, sodium ion batteries, potassium ion batteries, supercapacitors or fuel cells.

The invention provides a preparation method of a Mo-doped FeSe2 electrode material and application of the Mo-doped FeSe2 electrode material as a sodium-ion battery anode, and the preparation method comprises the following steps: mixing FeCl3. 6H2O, terephthalic acid and N, N-dimethylformamide, loading into a reaction kettle, and heating at high temperature to obtain an MIL-88B metal organic framework precursor; and then dispersing the MIL-88B precursor, sodium molybdate, selenium powder and hydrazine hydrate in a solvent, and doping Mo atoms into a FeSe2 electrode material through hydrothermal synthesis to obtain the Mo-FeSe2 sodium ion battery anode. According to the preparation method, Mo atoms are doped into FeSe2, so that the strength of Fe-Se bonds is enhanced, the structure collapse effect of the electrode material is effectively relieved from the structure level, an SEI film on an electrode liquid interface is compact and uniform, and the multiplying power and the cycle service life of the electrode material are effectively improved.

The invention discloses a transfer method for a heterogeneous double-layer structure of a suspended two-dimensional material, and belongs to the technical field of two-dimensional material transfer. The invention provides a method for transferring a two-dimensional material to a porous substrate by using PDMS and preparing a heterogeneous double-layer structure of a suspended two-dimensional material. The two-dimensional material is transferred to the hole substrate in sequence, the suspended two-dimensional material heterogeneous double-layer structure can be obtained, no solution needs to be used in the process, and pollution to the two-dimensional material is avoided. In the transfer process, the PDMS is adsorbed through electrostatic force between the slide and the PDMS, and the PDMS is lifted from one side to be separated from the substrate, so that the stress of the PDMS on the suspension part of the two-dimensional material in the transfer process can be remarkably reduced, and the transfer success rate is greatly improved. Compared with an existing transfer method, the transfer method does not need additional experimental instruments, and is simple to operate and high in success rate.

The invention belongs to the field of nano materials, and particularly relates to an indium selenide nanosheet compound as well as a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: mixing indium selenide nanosheets and silver ions in a second solvent, so that silver nanoparticles grow on the surfaces of the indium selenide nanosheets; the second solvent is a polar solvent, the Hansen solubility parameter delta of the third solvent is greater than or equal to 18MPa < 1 / 2 >, and the mass ratio of the indium selenide nanosheets to the silver ions is (5-50): 1. And growing silver nano-silver particles on the surface of indium selenide by utilizing a spontaneous oxidation-reduction reaction of indium selenide and silver nitrate, so as to prepare the indium selenide nanosheet compound with the surface modified by the silver nano-silver particles. The silver nanoparticles have strong absorption, and the photoelectric response effect of the indium selenide nanosheet is remarkably improved by compounding the silver nanoparticles and the indium selenide nanosheet.

The utility model relates to a device for producing tellurium powder by using tellurium dioxide, and belongs to the technical field of tellurium powder production equipment. Comprising a leaching kettle, a plate-and-frame filter press, a primary reduction kettle, a primary reduction filter barrel, a secondary reduction kettle, a secondary reduction filter barrel and a waste liquid tank which are sequentially connected, materials in the leaching kettle are conveyed into the plate-and-frame filter press through a first conveying pump, and the leaching kettle is further connected with a hydrochloric acid storage tank through a pipeline; the opening of the primary reduction kettle is positioned right above the primary reduction filter barrel, and the primary reduction kettle is also connected with a sulfur dioxide steel cylinder; materials in the primary reduction filter barrel are conveyed into a secondary reduction kettle through a second conveying pump; an outlet of the secondary reduction kettle is positioned right above the secondary reduction filter barrel, and the secondary reduction kettle is also connected with a sulfur dioxide steel cylinder; materials of the secondary reduction filter barrel are input into the waste liquid tank through a third conveying pump; the tellurium dioxide is produced by adopting the method, the technological operation is simple, the production efficiency is high, the tellurium content of the liquid after secondary reduction is low, the liquid can be reused in a leaching kettle, and the use amount of hydrochloric acid is reduced.

The invention discloses a preparation method of a NiS / NiSe2 heterojunction containing a non-interface Ni vacancy. The preparation method comprises the steps of precursor preparation and in-situ selenylation treatment. The invention further discloses the NiS / NiSe2 heterojunction containing the non-interface Ni vacancy. The NiS / NiSe2 heterojunction containing the non-interface Ni vacancy is prepared through the method.

The invention belongs to the technical field of nano materials and anti-tumor treatment medicines, and discloses cordyceps sinensis mycelium polysaccharide-copper selenide with dual effects of inducing tumor cell apoptosis and copper death as well as a preparation method and application thereof. The preparation method of the cordyceps sinensis mycelium polysaccharide-copper selenide comprises the following steps: taking cordyceps sinensis mycelium polysaccharide as a template, adopting a soft template method, reducing Na2SeO3 through Vc, and adding CuSO4 to prepare the cordyceps sinensis mycelium polysaccharide-copper selenide. The cordyceps sinensis mycelium polysaccharide-copper selenide can selectively kill tumor cells and induce apoptosis and copper death of the tumor cells at the same time, and has huge application potential in the aspect of tumor prevention and treatment.