23 results about "Bismuthate" patented technology

The invention discloses a sodium-doped copper bismuthate composite bismuth vanadate high-performance photoelectrode and a preparation method thereof, and belongs to the technical field of electrode materials. The sodium-doped copper bismuthate composite bismuth vanadate high-performance photoelectrode comprising the BiVO4 layer, the Na-CuBi2O4 layer and the nickel borate layer is provided, the sodium-doped copper bismuthate layer serves as a hole transport layer, the surface state is passivated, transport of carriers is promoted, recombination of surface charges is reduced, and the performance of the electrode is greatly improved; the nickel borate layer improves the photocorrosion defect of the material, and the stability is obviously improved; meanwhile, a heterojunction is formed between the BiVO4 layer and the Na-CuBi2O4 layer, so that the light absorption capacity of the BiVO4 is improved, the separation efficiency of photon-generated carriers is also enhanced, and finally, the high-performance photoelectrode with high stability, high carrier separation efficiency and high surface catalytic oxygen production efficiency is obtained.

The invention relates to the technical field of photocatalysis, and provides a preparation method of a copper-cuprous oxide-copper bismuthate ternary complex, which comprises the following steps: adding sodium bismuthate dihydrate, copper sulfate and sodium sulfite into a hydrothermal reaction kettle containing distilled water to obtain a solid-liquid mixture; and the solid-liquid mixture generates the copper-cuprous oxide-copper bismuthate ternary compound under a hydrothermal condition through a synergistic effect of a heterogeneous interface in-situ oxidation-reduction reaction of sodium bismuthate and a sodium sulfite solution and a homogeneous oxidation-reduction reaction of a copper sulfate solution and the sodium sulfite solution. The preparation method has the advantages that the elemental copper-cuprous oxide-copper bismuthate ternary compound is prepared by a one-pot method through cooperation of the out-phase interface in-situ oxidation-reduction reaction and the homogeneous oxidation-reduction reaction, and the preparation method is simple in preparation step, convenient to operate and easy to quantitatively control.

The invention discloses an LTCC (Low Temperature Co-Fired Ceramic) green tape as well as a preparation method and application thereof, and the preparation method comprises the following steps: mixing LTCC formula powder and additive phase powder to obtain mixed powder; mixing the mixed powder, a dispersing agent and a solvent, and performing first ball milling treatment to obtain a first ball milling product; adding an adhesive and a plasticizer into the first ball-milling product, and carrying out second ball-milling treatment to obtain a second ball-milling product; filtering the second ball-milled product to obtain ceramic slurry for tape casting; drying the casting ceramic slurry to obtain an LTCC (Low Temperature Co-Fired Ceramic) green tape; wherein the weight ratio of the LTCC formula powder to the additive phase powder is (50-95): (5-50); the LTCC formula powder comprises ceramic powder and glass powder; the additive phase powder is at least one of hexagonal boron nitride, fluorophlogopite sheets, bismuthate-based tungsten bronze and phosphate glass. According to the LTCC green tape prepared by the preparation method disclosed by the invention, the technical problem that the machinability and the thermal conductivity of an LTCC green substrate prepared by an existing LTCC green tape are relatively poor can be solved.

The invention relates to lead-free glass-coated copper powder for an HJT photovoltaic cell, conductive copper paste and a preparation method of the lead-free glass-coated copper powder and the conductive copper paste, the glass-coated copper powder comprises nano-copper powder and a coating layer on the surface of the nano-copper powder, and the coating layer is composed of bismuthate glass. According to the preparation method, a sol-gel method is adopted, the bismuthate glass is coated on the nano copper powder, the glass and the copper powder form a core-shell structure, the glass can be molten into a liquid phase during sintering, the contact between the glass and the copper powder is more uniform, and the oxidation resistance of the copper powder is enhanced. The prepared glass-coated copper powder can effectively isolate the copper powder from being in contact with an external oxidizing agent, excellent anti-oxidation protection is provided, the rapid oxidation point of the copper powder is increased by 100-150 DEG C compared with the rapid oxidation point of the copper powder before coating, and the service life of the copper powder is prolonged; meanwhile, the conductive copper paste has high stability, high reliability, low cost and high conductivity, and meets the environmental protection requirement.

The invention discloses bismuthate glass. The bismuthate glass is prepared from the following main raw materials: 50 to 83 weight percent of Bi2O3, 10 to 20 weight percent of B2O3, 3 to 10 weight percent of ZnO, 3 to 10 weight percent of SiO2 and 3 to 10 weight percent of Al2O3; 0-4wt% of TiO2 is added on the basis of the total weight of the main raw materials. The invention further discloses a coating based on the bismuthate glass. The reflection performance of the glass coating is remarkably improved, the radiation refrigeration effect of the glass ceramic coating is remarkably improved, and the glass ceramic coating has the radiation protection, insulation and anti-static effects.

The invention belongs to the technical field of preparation of photoelectric catalytic materials, and particularly provides a copper bismuthate / copper oxide conformal morphology heterojunction film and a preparation method thereof.The preparation method comprises the steps that a bismuth oxyiodide film is prepared and placed in a copper source solution, primary deposition is conducted for a certain time, and a pure-phase copper bismuthate film is obtained after sintering; a copper nanocrystal solution is prepared through laser beam irradiation, thiourea molecules are dissolved in the copper nanocrystal solution, and a mixed solution is obtained; spin-coating the mixed solution on the outer surface of a pure-phase copper bismuthate thin film, drying the thin film in a heating stage, placing the thin film in a copper source solution, carrying out secondary deposition for a certain time, and sintering again to obtain a copper oxide second phase attached to the outer surface of the pure-phase copper bismuthate thin film, so as to obtain a copper bismuthate / copper oxide conformal morphology heterojunction thin film; the pure-phase copper bismuthate film and the copper oxide second phase are obtained in sequence through two times of electro-deposition, and the preparation process is simple and easy to regulate and control; and the surface dynamics and the surface carrier extraction efficiency of the prepared thin film are greatly improved.

The application discloses an optical matching layer and a preparation method thereof, and the optical matching layer is composed of an epoxy resin matrix and surface-modified glass micro-powder fillers dispersed in the epoxy resin matrix; the modified glass micro-powder fillers are bismuthate glass micro-powder treated by a silane coupling agent; and the chemical composition of the bismuthate glass micro-powder is 54‑56mol%Bi2O3 、 28‑32mol%B2O3 , 14-16 mol% ZnO. By using the bismuthate glass matched in refractive index, light scattering is fundamentally reduced. Optical simulation (based on Mie scattering theory) shows that the light transmittance of the composite material is as high as 86.5% at 30% volume fraction, which is significantly better than that of a silica composite material with a light transmittance of 58.2% under the same conditions.

The invention provides a chemical mechanical polishing composition for polishing a silicon carbide substrate and a polishing method thereof. The chemical mechanical polishing composition comprises cerium oxide abrasive particles, an oxidizing agent and an oxidizing agent regenerant. Wherein the oxidant comprises permanganate, and the permanganate is reduced into Mn < 2 + > ions in the oxidation reaction process; and an oxidant regenerant comprising bismuthate that oxidizes the Mn < 2 + > ions to permanganate, thereby maintaining the concentration of the permanganate in the composition.

The invention discloses a supported copper-based nanorod heterojunction photocatalyst as well as a preparation method and application thereof. The heterojunction composite photocatalytic material provided by the invention comprises the following components: a carrier copper bismuthate nanorod and ZIF-67 on the surface of the carrier copper bismuthate nanorod. The preparation method comprises the following steps: adding a copper source and a bismuth source into water, and carrying out hydrothermal reaction to obtain a copper bismuthate nanorod CuBi2O4; mixing the obtained copper bismuthate nanorod with a cobalt source and an imidazole compound, stirring, and growing a ZIF-67 dodecahedron on the surface of the copper bismuthate nanorod in situ to obtain the heterojunction composite photocatalytic material ZIF-67 / CuBi2O4. The ZIF-67 / copper bismuthate heterojunction photocatalyst prepared by the invention has good photosensitivity, and can meet the requirement of producing methane by photocatalytic reduction of carbon dioxide; as a heterojunction composite photocatalytic material, the material has good photoelectrochemical properties, and can meet the requirements of efficient photoelectric conversion, wide spectral response, long cycle life and the like.

The invention relates to a copper bismuthate / porous carbon nitride composite electrode material and a preparation method and application thereof, and belongs to the technical field of capacitive deionization desalination. The preparation method of the copper bismuthate / porous carbon nitride composite electrode material comprises the following steps: uniformly mixing copper bismuthate and porous carbon nitride, adding a proper amount of ethanol, uniformly stirring, carrying out ultrasonic dispersion, and carrying out vacuum drying to remove a solvent to obtain a mixture; and calcining the mixture to obtain the copper bismuthate / porous carbon nitride composite electrode material. The copper bismuthate / porous carbon nitride composite material is adopted as the electrode material in the capacitive deionization technology, many limitations of a traditional electrode material in desalination performance, stability and service life are successfully overcome, and the overall performance of the CDI technology is remarkably improved.

The invention discloses a C / C-based tungsten nitride / bismuth tungstate composite material and a preparation method and application thereof.The preparation method comprises the steps that WN and Bi2WO6 are placed in the same beaker, then an isopropanol solution is added, stirring is conducted till the WN and the Bi2WO6 are evenly dispersed, then iodine is added, stirring continues to be conducted till the mixture is even, and a deposition solution is obtained; the preparation method comprises the following steps: pre-treating a C / C substrate, fixing the pre-treated C / C substrate on a negative electrode of hydrothermal electrophoretic deposition equipment, then putting the pre-treated C / C substrate in a deposition solution F, heating a hydrothermal deposition kettle, applying voltage to carry out electrophoretic deposition, putting a self-supporting sample after deposition into a drying oven for drying to finally obtain a C / C-WN / Bi2WO6 photoelectrode material, and synthesizing a WN / Bi2WO6 heterojunction on the C / C substrate to be used as a photoanode. Tungsten nitride is used as the electron transport layer, photo-induced electrons generated by light absorption of bismuth tungstate can be transmitted to the C / C substrate and then transmitted to the photocathode, the structure is beneficial to reduction of recombination of photo-induced carriers, and then the photoelectrocatalysis performance of bismuth tungstate is improved.

The invention relates to low-iron glass for solar thermal power generation and a preparation method of the low-iron glass. Comprising the following steps: uniformly mixing 58.5 to 60 parts by weight of low-iron quartz sand, 12 to 15 parts by weight of low-iron dolomite, 3.5 to 6 parts by weight of low-iron limestone, 18.5 to 20 parts by weight of sodium carbonate, 1.7 to 2.1 parts by weight of potassium metaaluminate, 0.55 to 1.15 parts by weight of kainite, 0.25 to 0.5 part by weight of potassium bismuthate and 0.06 to 0.14 part by weight of cerium oxide to obtain a mixture; the mixture is put into a kiln to be melted, the melting temperature is set in a gradient mode, the oxidizing atmosphere is kept, and molten glass is obtained; clarifying, homogenizing, cooling, forming, annealing and cutting the molten glass to obtain the low-iron glass for solar thermal power generation. The low-iron glass for solar thermal power generation has higher sunlight direct transmittance and lower bubble defect number.

The invention relates to a porous copper bismuthate electrode material and a preparation method and application thereof, and belongs to the technical field of capacitive deionization desalination. The invention aims to solve the technical problems that the ion adsorption capacity and the electrochemical stability of a carbon-based electrode material are still limited, and the requirement for efficient and stable desalination in practical application is difficult to meet. The preparation method of the porous copper bismuthate electrode material comprises the following steps: adding a complexing agent into a mixed solution of a bismuth source and a copper source, then adding pretreated cordierite powder, and fully stirring under magnetic stirring to enable the cordierite powder to be uniformly dispersed in the solution to obtain a precursor mixed solution; and carrying out hydrothermal reaction on the precursor mixed solution, cooling after the reaction is finished, carrying out centrifugal separation, washing and drying to obtain the porous copper bismuthate electrode material. The porous copper bismuthate (CuBi2O4) electrode material is prepared by taking cordierite as a template and is applied to desalination in a capacitive deionization technology, so that the desalination efficiency is remarkably improved.

The application belongs to the technical field of photoelectric catalytic material preparation, and specifically provides a copper bismuthate / copper oxide conformal morphology heterojunction film and a preparation method thereof. The preparation method comprises the following steps: preparing a bismuth oxyiodide film, placing the bismuth oxyiodide film in a copper source solution, depositing for a certain time, sintering to obtain a pure-phase copper bismuthate film; preparing a copper nanocrystal solution through laser beam irradiation, dissolving thiourea molecules in the copper nanocrystal solution to obtain a mixed solution; spin-coating the mixed solution on the outer surface of the pure-phase copper bismuthate film, placing the pure-phase copper bismuthate film on a hot table for drying, placing the pure-phase copper bismuthate film in the copper source solution, depositing for a certain time again, sintering again to obtain a copper oxide second phase attached to the outer surface of the pure-phase copper bismuthate film, and obtaining the copper bismuthate / copper oxide conformal morphology heterojunction film. The pure-phase copper bismuthate film and the copper oxide second phase are obtained through two-time electrodeposition in sequence, the preparation process is simple and easy to control, and the surface dynamics and the surface carrier extraction efficiency of the prepared film are greatly improved.

The application belongs to the technical field of semiconductor photoelectrocatalytic functional materials, and particularly relates to a copper bismuthate-based composite thin film electrode material, a preparation method and application thereof. The application adopts a spin-coating-annealing-calcination process to construct a copper bismuthate thin film layer on a conductive substrate, and realizes the sequential loading of cadmium sulfide, noble metal or oxide thereof on the copper bismuthate thin film layer through chemical bath deposition and impregnation and calcination. The copper bismuthate thin film layer and the cadmium sulfide layer form a p-n heterojunction structure, and an electrocatalytic layer of noble metal is introduced on the surface of the p-n heterojunction, so as to enhance the interface charge transport process and improve the surface reaction kinetics. The copper bismuthate-based composite thin film electrode material not only has a simple preparation process, but also has high photoelectrocatalytic activity and cycle stability, so as to realize the efficient degradation of organic pollutants and has high application prospect.

The present invention discloses a potassium sodium niobate-lanthanum bismuthate-sodium niobate-based energy storage ceramic material and a preparation method thereof. The chemical formula of the energy storage ceramic material is (0.9- x )K 0.5 Na 0.5 NbO3‑ x LaBiO3-0.1NaNbO3, where 0.02≤x≤0.045, is prepared according to the general chemical formula, ball-milled, and then granulated with a binder. The ceramic sheet is pressed and formed, and the binder is removed and sintered to obtain an energy storage ceramic material. The present invention adopts the above-mentioned potassium sodium niobate-lanthanum bismuthate-sodium niobate-based energy storage ceramic material and its preparation method. By adding an appropriate amount of lanthanum bismuthate and sodium niobate, the grain refinement of the potassium sodium niobate ceramic is promoted, the density is increased, and a high maximum polarization intensity P is obtained. m , lower residual polarization intensity P r and high breakdown field strength DBS, thereby obtaining excellent energy storage characteristics. In addition, the present invention is simple to operate, has a wide source of raw materials, has low equipment cost, meets environmental protection requirements, and is easy to apply.

The present invention relates to a water-soluble BiO 2‑x nanomaterial, its preparation method and application, belonging to the technical field of nanomaterials, and solves the problem of poor water solubility of BiO 2‑x nanomaterials in the prior art. The method comprises the following steps: dissolving hydroxides of alkali metals and bismuthates, stirring to obtain a suspension, heating the suspension for hydrothermal reaction to obtain BiO 2‑x powder; adding an aqueous solution of sodium hexametaphosphate to the BiO 2‑x powder for the first ball milling, then adding an aqueous solution of polyvinylpyrrolidone for the second ball milling, washing, and freeze-drying to obtain the water-soluble BiO 2‑x nanomaterial. The method of the present invention forms a composite material by wet ball milling the synthesized BiO 2‑x powder with a sodium hexametaphosphate solution and a polyvinylpyrrolidone solution, improving the water solubility of the BiO 2‑x nanomaterial and further enhancing its catalytic ability.

This invention relates to the field of photocatalysis technology and provides a method for preparing a copper-cuprous oxide-copper bismuthate ternary complex. Sodium bismuthate dihydrate, copper sulfate, and sodium sulfite are added to a hydrothermal reactor containing distilled water to obtain a solid-liquid mixture. Under hydrothermal conditions, the solid-liquid mixture undergoes a synergistic reaction between sodium bismuthate and sodium sulfite solutions in a heterogeneous interface in-situ redox reaction and between copper sulfate and sodium sulfite solutions in a homogeneous redox reaction to generate the copper-cuprous oxide-copper bismuthate ternary complex. The advantages of this invention are: a one-pot method for preparing elemental copper-cuprous oxide-copper bismuthate ternary complex through a synergistic combination of heterogeneous interface in-situ redox reaction and homogeneous redox reaction; and the preparation steps are simple, convenient, and easily quantitatively controlled.

The invention discloses a europium-doped bismuthate radiation-resistant optical glass material and a preparation method thereof, 50 to 56 parts of H3BO3, 0.9 to 1.8 parts of La2O3, 1.1 to 2.8 parts of Na2CO3, 4.8 to 5.5 parts of K2CO3, 30 to 45 parts of Bi2O3, 0.5 to 3.8 parts of Eu2O3 and 1.2 to 4.5 parts of Sb2O3 are mixed and then are subjected to high-temperature melting, and obtained high-temperature glass liquid is subjected to molding and annealing treatment to obtain the europium-doped bismuthate radiation-resistant optical glass material. According to the radiation-resistant glass prepared by the invention, the novel variable valence element Eu is added, so that the formation of a color center in a microstructure after high-dose gamma radiation can be effectively inhibited. Meanwhile, the novel variable valence element Eu can practically solve the problems that the radiation-resistant glass is discolored and the initial transmittance is reduced due to the traditional variable valence element Ce. On the basis of the gamma absorption coefficient of the element, the Bi oxide in the radiation-resistant glass is used as one of network forming bodies, so that the problem of toxicity of the Pb element is avoided while the radiation resistance is ensured. The Sb element oxide is added, so that the problems that the Bi element causes glass discoloration and the initial transmittance of the glass is reduced are effectively solved.

The invention belongs to the technical field of extraction, and specifically relates to a method for preparing cesium iodide from rubidium-cesium enriched material. The method comprises the following steps: S1: high-temperature roasting; S2: dissolving the roasting residue in deionized water and filtering to obtain solution A and filter residue; S3: adding acid to solution A to adjust the pH of solution A to acidic, and at the same time, adding iodide ions to obtain yellow solution B; S4: weighing bismuth oxide and dissolving it in hydrochloric acid to obtain solution C; S5: adding the yellow solution B to solution C to obtain a red solid precipitate D containing cesium and a rubidium-containing solution E; S6: solid-liquid separation; and S7: thermal decomposition treatment. The invention uses bismuth ions and iodide ions as precipitants, adds bismuth ions and iodide ions to a solution containing rubidium-cesium potassium, and reacts to generate precipitated cesium iodide bismuthate, thereby achieving almost selective recovery of cesium in the rubidium-cesium potassium solution. In addition, cesium iodide with a purity greater than 99% can be directly obtained by thermal decomposition of the cesium iodide bismuthate, and the bismuth iodide can be recovered to further prepare the precipitant.

The invention discloses a YSZ ceramic and aluminum-silicon alloy low-temperature connection glass soldering paste and a connection method, the low-temperature connection glass soldering paste is prepared by mixing bismuthate glass powder and an organic carrier, and the mass ratio of the bismuthate glass powder to the organic carrier is (6-8): 1; wherein the bismuthate glass powder is prepared from the following raw materials in percentage by mass: 75 to 80 percent of Bi2O3, 10 to 15 percent of B2O3, 6 to 8 percent of SiO2 and 2 to 4 percent of CuO. Compared with the prior art, the bismuthate glass powder has excellent thermal stability and lower crystallization tendency during heating, so that the residual stress of a weld joint is reduced, the joint strength is improved, and the low-temperature connection process is simple, does not need metallization pretreatment, and is low in welding temperature, low in cost and environmentally friendly.

This invention discloses a nano-heterojunction radiosensitizer suitable for hypoxic tumors and its preparation method. The radiosensitizer is a core-shell structured nanoparticle, comprising a core and a shell. The core is a high-valence bismuth-based nanomaterial, including at least one of sodium bismuthate, silver bismuthate, and potassium bismuthate. The shell coats the surface of the core and comprises a metal oxide. A Z-shaped heterojunction is formed between the inner core and the outer shell. Under X-ray excitation, this heterojunction forms a built-in electric field, promoting electron-hole separation. Electrons in the high-valence bismuth nanoparticle phase reduce high-valence bismuth (Bi). 5+ →Bi 3+ ) and releases highly reactive lattice oxygen, which then reacts with holes on the TiO2 phase to generate singlet oxygen ( 1 O2), while the holes on TiO2 oxidize water molecules to produce hydroxyl radicals (•OH).

The invention relates to a preparation method of a photocatalyst material. The invention relates to a preparation method of a silver bismuthate / bismuth molybdate heterojunction rich in oxygen vacancies, which comprises the following steps: constructing a staggered Z-type heterojunction by using a Bi2MoO6 nano material and an AgBiO3 nano material with oxygen vacancies, and synthesizing to obtain an AgBiO3 / Bi2MoO6 heterojunction photocatalytic material rich in oxygen vacancies. Wherein the mass fraction of the AgBiO3 is 5 to 15 percent. According to the invention, Bi2MoO6 and AgBiO3 are combined to form a heterojunction for the first time, Bi2MoO6 is used as a bismuth oxide, and the Bi2MoO6 shows the response capability to visible light due to the energy band structure of Bi2MoO6, so that the photocatalytic performance of the material is improved. For the AgBiO3 / Bi2MoO6 heterojunction, the forbidden band width of Bi2MoO6 is about 2.8 eV, the forbidden band width of AgBiO3 is about 0.8 eV, the Bi2MoO6 and the AgBiO3 can be excited under visible light, a staggered Z-type heterojunction can be formed, rapid separation of photo-induced electron-hole pairs is facilitated, and the photocatalytic performance of the material is improved.