146results about "Lead halides" patented technology

The invention discloses a method for preparing a perovskite quantum dot at a room temperature. The luminescent quantum dot is MPbX3; in the formula, M is methyl amine (MA) or Cs, and X is any one of Cl, Br and I. According to the method disclosed by the invention, MX and PbX2 are dissolved in an organic solvent, and a certain amount of surfactant is added to form a precursor solution; an appropriate amount of the precursor solution is added into a poor solvent to form the perovskite quantum dot. By changing the quantity of the surfactant, the luminescence wavelength of the quantum dot can be adjusted, so that luminescence of fully-visible wave bands is realized. The method disclosed by the invention can be carried out at the normal temperature, protective gas is not needed, equipment is simple, and scale production is realized. According to the perovskite quantum dot prepared by the method, the fluorescent full width at half maximum is 20 to 43nm; the fluorescent quantum efficiency isnearly 90 percent, and the perovskite quantum dot can be applied to the fields of solar batteries, laser, photo-detectors, light-emitting diodes and the like.

The invention relates to the technical field of inorganic nanomaterial preparation, and in particular, relates to a method for preparing a two-dimensional inorganic flaky nanomaterial by mechanical force intercalation stripping of a three-dimensional inorganic layered crystal material. With mixed metal halide as an intercalation and stripping medium, the purified layered inorganic crystal materialand the intercalation and stripping medium are subjected to solid-phase high-energy ball milling treatment together, mixed powder after ball milling treatment is washed with water to remove the intercalation and stripping medium, the three-dimensional layered material can be highly efficiently made into the corresponding two-dimensional flaky material. The method has universality for stripping ofthe inorganic non-metallic layered crystal material, has the advantages of simple preparation process, short production cycle, and high yield of the two-dimensional material, does not affect a crystal structure of the two-dimensional material, and the intercalation and stripping medium can be reused without causing environmental pollution.

This invention is related to a method for the preparation of halide perovskite or perovskite-related materials on a substrate and to optoelectronic devices and photovoltaic cells comprising the perovskites prepared by the methods of this invention. The method for the preparation of the perovskite includes a direct conversion of elemental metal or metal alloy to halide perovskite or perovskite-related materials.

This invention is related to a method for the preparation of halide perovskite or perovskite-related materials on a substrate and to optoelectronic devices and photovoltaic cells comprising the perovskites prepared by the methods of this invention The method for the preparation of the perovskite includes a direct conversion of elemental metal or metal alloy to halide perovskite or perovskite-related materials.

The invention relates to a device and a method for continuous and controllable synthesis of uniform nanocrystalline at normal temperature. The method includes: injecting a prepared lead bromide precursor and Cs precursor into a capillary micro-fluidic chip micro-reactor (5) through a double-channel injection pump (3), mixing the substances uniformly, feeding the mixture into a connecting pipe (4),then putting the connecting pipe into an ultrasonic device (6), and carrying out ultrasonic continuous reaction, thus achieving continuous and controllable synthesis of cesium-lead-bromine perovskiteuniform nanocrystalline directly at normal temperature. The device and method provided by the invention realizes continuous synthesis of cubic-phase cesium-lead-bromine perovskite nanocrystalline with uniform size at normal temperature.

The invention provides a processing method for waste liquid from stripping tin scolding, which comprises the following steps: in the waste liquid from stripping tin scolding, adding a chlorate for reacting, then filtering the solution, washing the filter residue by a concentrated ammonia liquor for dissolving the silver chloride sediment, recovering silver by a washing lotion to acquire pure lead chloride, extracting a filtrate by an extractant to obtain ferric iron, wherein a strip liquor is a ferric trichloride solution which can be prepared to a tin stripping liquid, adding sulfate for depositing lead and silver, wherein the reacted filter residue is a mixed sediment of lead sulphate and silver sulfate, washing by the concentrated ammonia liquor, reducing to obtain a silver powder and lead sulphate; filtering and depositing lead and silver, depositing tin and iron, filtering to obtain the sediment and dissolving by alkali, and then electrolyzing to obtain tin, electrolyzing the residual filtrate to recovery copper, and depositing palladium in the solution to obtain the sediment for recovering palladium. The processing method has reasonable and useful process flow, and performs comprehensive recovery and utilization on valuable metal in the waste liquid from stripping tin scolding, the resource waste is reduced, and the environmental pollution is reduced.

The invention discloses a method for recovering lead chloride from sintered ashes and preparing lead monoxide, which mainly comprises the following steps of: (A) adding the sintered ashes into industrial water while stirring to prepare into suspension slurry, and carrying out two-stage gradient magnetic concentration consisting of a weak magnetic concentration and strong magnetic concentration on the suspension slurry of the sintered ashes; (B) adding tail mud obtained from the magnetic concentration in to a NaCl solution, and recovering lead in the tail mud by adopting a chlorination extraction mode of hydrochloric acid and NaCl; and (C) dissolving PbCl2 crystal in a NaCl water solution, adding Na2CO3 into the solution for complete precipitation reaction, centrifugally filtering and washing the suspension solution, and drying and roasting the obtained solid to obtain a lead monoxide produce. The invention can not only completely remove corrosion and damages of elements of lead, copper and the like on a blast furnace when the sintered ashes are directly recycled during iron and steel melting, but also recover and comprehensively utilize the valuable elements.

A perovskite quantum dot preparation method and a perovskite quantum dot solution are provided. The preparation method may include: providing a first solution including caesium oleate, a second solution including lead halide and a third solution including DDAB; adding the first solution, the second solution and the third solution into a non-polar alkyl solution at a preset proportion and stifling to obtain a perovskite quantum dot solution; the perovskite quantum dot solution may include caesium-lead-halogen of pure phase. In this way, the present disclosure can easily obtain the perovskite quantum dot solution including caesium-lead-halogen of pure phase.

The invention discloses a method for preparing lead chloride and zinc sulfate by using mid low grade zinc oxide ores and zinc oxide-lead oxide paragenetic ores, comprising the following steps: (1) crushing zinc ores and levigating, then mixing the levigated zinc ores with ammonium sulfate and roasting; (2) dissolving out clinkers obtained by roasting, carrying out iron precipitation and aluminium precipitation on the obtained filtrate, and further separating lead from the residues of zinc extraction; (3) boiling down a zinc sulfate solution obtained after iron precipitation and aluminium precipitation for electrolysis; and (4) leaching the residues of zinc extraction with an NaCl solution to obtain a filtrate, condensing the filtrate, cooling down and crystallizing out PbCl2 crystals, and returning the NaCl solution to the leaching process. According to the invention, circulation utilization is realized.

The invention relates to a method for hot preparation of hollow lead fluoride nanometer spheres by micro-emulsion assisted solvent, belonging to the technical field of preparation technology of inorganic nanometer materials. Adopting cyclohexane as the solvent, the method for hot preparation of hollow lead fluoride nanometer spheres by micro-emulsion assisted solvent uitlizes the precipitation reaction between hydrogen fluoride and lead ions and takes a surfactant as a soft template, to prepare the hollow lead fluoride nanometer spheres; wherein, the soft template is made from a plurality of surfactants, and the lead ions come from the soluble lead salts; the synthesized magnesium carbonate nanometer rods are provided with a diameter roughly between 30 and 100nm. Through the method for hot preparation of hollow lead fluoride nanometer spheres by micro-emulsion assisted solvent, the synthesized hollow lead fluoride nanometer spheres have the advantages of controllable size, low cost, simple preparation equipment, safe and easy operation, excellent performance of technique repeatability and stable products quality, and are suitable for the large-scale industrial production.

A process for chlorinating ore, slag, mill scale, scrap, dust and other resources containing recoverable metals from the groups 4-6, 8-12, and 14 in the periodic table. The process comprises: a) forming a liquid fused salt melt consisting essentially of aluminum chloride and at least one other metal chloride selected from the group consisting of alkali metal chlorides and alkaline earth metal chlorides, wherein the aluminum chloride content in the liquid salt melt exceeds 10% by weight; b) introducing the recoverable metal resources into said liquid salt melt: c) reacting the aluminum chloride as chlorine donor with said recoverable metal resource to form metal chlorides, which are dissolved in the salt melt; and d) recovering the formed metal chlorides from the salt melt.

The invention provides a method for preparing a perovskite quantum dot film through one-step crystallization, and belongs to the technical field of perovskite quantum dot materials. Adamantane methylamine and haloid acid are used as ligands, cesium halide, lead halide, the ligands and a solvent are mixed to obtain a precursor solution, the precursor solution is then deposited on a substrate, and the CsPbX3 perovskite quantum dot film is obtained after heating. The adamantane methylamine and the haloid acid are used as ligands, can rapidly cover perovskite, and are coordinated with CsPbX3 perovskite, and perovskite quantum dots are directly formed through a strong three-dimensional effect; meanwhile, the method is easy to operate and low in cost, the high-quality perovskite quantum dot filmwith the thickness larger than 500 nm can be directly obtained through one-step crystallization, and the obtained perovskite quantum dot film is high in repeatability, high in stability, good in fluorescence performance and uniform in grain distribution.

Provided are perovskite nanocrystalline particle and an optoelectronic device using the same. The perovskite nanocrystalline particle may include a perovskite nanocrystalline structure while being dispersible in an organic solvent. Accordingly, the perovskite nanocrystalline particle in accordance with the present invention has therein a perovskite nanocrystal having a crystalline structure in which FCC and BCC are combined; can form a lamellar structure in which an organic (or A site) plane and an inorganic plane are alternately stacked; and can show high color purity since excitons are confined to the inorganic plane.

The invention belongs to the technical field of preparation of semiconductor nanomaterials and discloses a single-size CsPbX3 perovskite nanocrystalline preparation method. The method includes: adding cesium carboxylate solution into N2 protected lead bromide solution to realize reaction for obtaining single-size CsPbBr3 perovskite nanocrystalline; scattering the single-size CsPbX3 perovskite nanocrystalline into normal hexane, and gradually adding lead chloride solution or lead iodide solution drop by drop to realize reaction for obtaining single-size CsPbBr3 perovskite nanocrystalline. The single-size CsPbX3 perovskite nanocrystalline preparation method has the advantages of simplicity in operation, easiness in size adjustment of products, component controllability and the like.

The invention discloses an environment-friendly method for ultrasonically synthesizing CsPbBr3 nano-crystals with different structures. The method comprises the steps of adding Cs2CO3, PbBr2, oleic acid and oleylamine into liquid paraffin, carrying out ultrasonic and uniform dispersion, carrying out centrifugation to obtain precipitates, dissolving the precipitates into an organic solvent, carrying out centrifugation again, and putting the obtained precipitates into an organic solvent again for storage, so as to obtain the CsPbBr3 nano-crystals. The method is simple in process, and no surfacefinishing agent or toxic solvent are added, so that the method is environmentally friendly and efficient; by controlling the proportion of oleic acid to oleylamine and the ultrasonic power, the structures of the synthesized CsPbBr3 nano-crystals are controlled, and the CsPbBr3 nano-crystals with different structures can be prepared; and meanwhile, the CsPbBr3 nano-crystals have high stability andfluorescence efficiency and do not quench at a high temperature for a long time and have wide application prospects.