37 results about "Lead chloride" patented technology

The invention provides an organic-inorganic perovskite light absorption layer, a perovskite solar cell and respective preparation methods, the light absorption layer adopts three-source co-evaporation to form an inorganic material layer, then the inorganic material layer is coated with an organic ammonium salt, cesium halide and lead chloride are introduced in the preparation method, a large-framework CsPb2X5 (X = Cl / Br / I) quasi-two-dimensional layered structure is formed in the inorganic layer, and the perovskite solar cell is prepared. The distance between crystal surfaces in the inorganic framework is enlarged, and permeation of an organic ammonium salt solution is promoted. The content of the lead chloride is controlled by regulating the deposition rate of the lead chloride so as to form gradient distribution, so that energy level alignment of the light absorption layer and the hole transport layer is realized, and the efficiency of the perovskite solar cell is improved.

The invention discloses a method for recycling zinc smelting tailings, which comprises the following steps of: sieving the dried zinc smelting tailings, classifying and sampling, leaching coarse fraction by hydrochloric acid to obtain a leaching solution I and lead chloride slag, mixing the leaching solution with fine fraction tailings, adjusting the pH value of the solution to be neutral to obtain neutralized slag and neutralized liquid, and recycling the neutralized slag and the neutralized liquid. The neutralized liquid is subjected to replacement to obtain replacement slag and a replacement liquid, the replacement liquid is subjected to iron removal purification electrodeposition casting to obtain a zinc ingot, the replacement slag is subjected to acid leaching again to obtain copper slag and a leaching solution, and the germanium-gallium-indium leaching solution is subjected to extraction and electrolytic refining to obtain germanium concentrate, metal gallium and metal indium; the lead chloride slag is leached through sulfuric acid to obtain lead sulfate slag, the lead sulfate slag is subjected to pyrogenic process lead smelting to recover lead metal, a leaching solution II is subjected to hydrochloric acid and sulfuric acid separation, and a sulfuric acid solution and a hydrochloric acid solution are obtained and can be recycled. The method is high in recovery rate and low in production cost, and the purposes of low-pollution, low-carbon and economical industrial production and rare and precious metal recycling are achieved.

The application belongs to the technical field of ion batteries, and particularly relates to a lead-carbon composite material and a preparation method and application thereof. The preparation method comprises the following steps: grinding and tabletting a lead source and a carbon source, and roasting the tabletted tablet to obtain the lead-carbon composite material; the lead source comprises at least one of lead citrate, lead acetate, lead chloride and lead oxalate; and the carbon source comprises at least one of polyvinylpyrrolidone, carboxymethyl cellulose, glucose and sucrose. The lead-carbon composite material has a three-dimensional porous structure formed by metal lead particles embedded in a carbon skeleton, and the carbon skeleton can effectively alleviate the volume expansion generated in the alloying process of metal lead and metal sodium in the charging and discharging process, so as to improve the conductivity and electrochemical performance of the material.

The invention discloses a strontium chloride-assisted method for improving the fluorescence quantum yield of manganese-doped CsPbCl3 quantum dots, which comprises the following steps: adding cesium carbonate into octadecene, heating and stirring until uniform mixing, and injecting oleic acid to obtain a cesium oleate solution; the preparation method comprises the following steps: adding different amounts of strontium chloride auxiliary dopant, manganese chloride dopant, lead chloride, oleylamine and oleic acid into octadecene, heating and stirring to uniformly mix to obtain a precursor mixed solution; injecting the cesium oleate solution into the precursor mixed solution, reacting for a certain period of time, and cooling in ice water to room temperature to form a CsPbCl3 quantum dot stock solution; a certain proportion of a flocculating agent is added into the stock solution, and a CsPbCl3 quantum dot solution is obtained through centrifugal treatment. According to the preparation method disclosed by the invention, the quantum yield of Mn-emitted fluorescence of the Mn-doped CsPbCl3 quantum dot is improved by regulating and controlling the addition amount of the doping agent, and finally, the quantum yield of Mn-emitted fluorescence of the Sr and Mn co-doped CsPbCl3 quantum dot reaches up to 100%.

The invention relates to a lead-based perovskite single crystal, a method for controlling growth of the lead-based perovskite single crystal and application of the lead-based perovskite single crystal, and the method for controlling growth of the lead-based perovskite single crystal comprises the following steps: dissolving bromoacetic acid in dimethyl sulfoxide, and heating, stirring and mixing to obtain a mixed solution; adding the mixed solution and a solvent into a mixture of lead chloride, methylamine bromide and lead bromide, and stirring for reaction to obtain a precursor solution; and filtering and heating the precursor solution to obtain the perovskite single crystal. In the crystal growth process, the high-quality perovskite single crystal can be obtained in a short growth period by adjusting nucleation dynamics and maintaining the stability of the growth solution, the contradiction between the growth efficiency of the single crystal and the quality of the single crystal is relieved by utilizing a nucleation inhibition strategy, and on the premise that the sensitivity of a detector is not sacrificed, the high-quality perovskite single crystal can be obtained. The crystal growth period can be effectively shortened.

The invention belongs to the field of perovskite devices, and particularly discloses a bromine-chlorine mixed blue-light perovskite thin film, a preparation method and a perovskite LED device. The bromine-chlorine mixed blue-light perovskite thin film is prepared from the following raw materials: cesium halide, lead bromide, lead chloride and alkaline earth metal bromide; the alkaline earth metal bromide comprises at least one of calcium bromide, strontium bromide and barium bromide; the ratio of the mole number of the alkaline earth metal bromide to the total mole number of Pb in lead bromide and lead chloride is not greater than 0.5. The bromine and chlorine mixed blue light perovskite is doped by adopting the alkaline earth metal bromide with a low-solubility perovskite phase, and the molar ratio of the doping amount of the alkaline earth metal bromide is not higher than 0.5, so that the nonuniform bromine and chlorine distribution of the blue light perovskite thin film in the film forming process is improved, the halogen separation under an electric field is inhibited, and the spectral stability is improved; by directly doping in the precursor, the preparation process is simple, and the method is suitable for large-scale industrial production.

This invention discloses a room-temperature phase pyroelectric material and its preparation method, relating to the field of pyroelectric material technology, with the chemical formula C4H. 14 N₂OPbCl₄ is prepared as follows: 2-Dimethylaminoethylamine is cooled and stirred in an ice-water bath, then hydrogen peroxide solution is added dropwise while stirring. After the reaction, the resulting reaction solution is vacuum dried to obtain the nitrogen oxide of 2-dimethylaminoethylamine. The nitrogen oxide of 2-dimethylaminoethylamine and lead chloride are added to a concentrated hydrochloric acid solution, heated in an oil bath, and stirred to obtain a pyroelectric material. The pyroelectric material of this invention has a perovskite structure and undergoes a reversible phase transition reaction at a phase transition temperature of 27°C. During the phase transition, a current is generated at the polar axis of the crystal. The phase transition temperature at room temperature allows the pyroelectric material to operate within a relatively stable temperature range, providing reliable energy collection performance and showing great application value in waste heat utilization, self-sustaining systems, and other fields.

The application discloses a method for preparing a heterojunction perovskite photodetector, comprising the following steps: preparing an electron transport layer; dissolving lead iodide and lead chloride in a mixed solution of dimethylformamide, N-methylformamide and N-methylpyrrolidone to obtain a precursor solution; in an air atmosphere, spin-coating the precursor solution onto the electron transport layer, immediately immersing into an anti-solvent after uniform spreading, and obtaining a PbI2-PbCl2 film after crystallization; spin-coating a methylammonium iodide solution onto the PbI2-PbCl2 film, and obtaining a perovskite film after vacuum annealing; spin-coating a long-chain ligand solution onto the three-dimensional perovskite film, vacuum annealing, and obtaining a perovskite heterojunction film; sequentially preparing a hole transport layer, a hole blocking layer and an anode on the perovskite heterojunction film to obtain the heterojunction perovskite photodetector. The method has the advantages that the prepared photodetector has high external quantum efficiency and high detection rate, and the preparation is simple.

The invention discloses a method for recycling metal lead in waste lead plaster by utilizing a deep-eutectic solvent ore pulp electrolysis technology, which comprises the following specific steps: preparing a choline chloride-malonic acid deep-eutectic solvent, and adding a lead chloride solution with the concentration of 5-15g / L into the choline chloride-malonic acid deep-eutectic solvent to obtain deep-eutectic solvent ore pulp; the deep-eutectic solvent ore pulp is equally divided into two parts, the two parts are placed in a cathode chamber and an anode chamber of an electrolytic bath respectively, waste lead paste is placed in the anode chamber of the electrolytic bath and stirred, then a power source is connected, electrolysis is conducted with constant current, and finally lead powder is obtained at a cathode. Compared with a traditional acidic or alkaline ore pulp electrolysis technology, the eutectic ore pulp electrolysis system has rich hydrogen bond donors and acceptors, high-valence PbO2 in the waste lead plaster can be efficiently reduced, the high-valence PbO2, divalent PbSO4 and PbO form a complex to be dissolved into a solution, and the recovery effect is obvious.

The present application provides an electrochemical pretreatment method for lead-containing heavy sand, which belongs to the field of hydrometallurgy technology. The present invention uses two-step electrolysis, first electrolyzing NaCl to oxidize the galena in the lead-containing heavy sand and generate lead chloride and elemental sulfur, and then electrolyzing manganese salt to oxidize the metal sulfide in the lead-containing heavy sand, thereby completing the pretreatment of the lead-containing heavy sand. The present invention can adjust the concentration ratio of NaCl and manganese salt in the electrolyte and the voltage in the two-step electrolysis to make NaCl and Mn 2+ The electrolysis is carried out in steps, sequentially reducing the lead in the lead-containing heavy sand and oxidizing the metal sulfides. The pretreatment method of the present invention not only recovers the lead as a resource but also removes the sulfides within it, providing qualified raw materials for subsequent gold smelting. This method features a short process flow, convenient operation, simple equipment, and is environmentally friendly, providing a highly valuable technical solution for the field of precious metal hydrometallurgy.

This invention belongs to the field of solid waste recycling, specifically relating to a method for leaching and preparing hydroxyl chloride lead ore from steel metallurgical dust washing slag. The method involves leaching hydroxyl chloride lead ore-containing steel metallurgical dust washing slag in a composite leaching solution, converting the hydroxyl chloride lead ore into water-soluble PbCl. x y‑ The complex was then subjected to solid-liquid separation to obtain PbCl-rich material. x y‑ Leachate and iron slag of the complex; PbCl x y‑ In the above, x is 3 or 4, and y is 1 or 2; the composite leachate is an aqueous solution containing dissolved acid and auxiliaries; the acid is at least one of hydrochloric acid and acetic acid; the auxiliaries are water-soluble salts of at least one cation selected from Na, K, Ca, and Fe; an alkaline precipitant is added to the leachate to remove PbCl... x y‑ The complex is conditioned and precipitated, with the pH of the system during the conditioning and precipitation process being 6-10; subsequently, solid-liquid separation is performed to obtain lead chloride ore. This invention can selectively remove lead enriched in steel metallurgical dust washing slag, reducing its harm to the steel smelting process after return to sintering; at the same time, it realizes the resource recovery of lead.

The present application belongs to the technical field of waste lead acid battery resource and lead chloride crystal preparation, and discloses a method for preparing lead chloride crystal from waste lead paste by a short wet process, which specifically comprises the following steps: S1: stirring and reacting the waste lead paste in a carbonate solution to obtain desulfurized lead paste; S2: using an HCl-NaCl mixed solution as a leaching agent to leach the desulfurized lead paste to obtain a leaching solution; and S3: recrystallizing to obtain lead chloride crystals. The present application improves the overall process design of the preparation method, first uses a carbonate solution to desulfurize the waste lead paste, then uses an HCl-NaCl mixed solution as a leaching agent to leach the desulfurized lead paste, and finally recrystallizes to obtain high-purity lead chloride crystals, effectively solving the technical problems of long process steps, large reagent input, and low conversion rate of lead chloride in the prior art.

The invention discloses a method for separating and recycling valuable metals in a retired photovoltaic module solder strip, which comprises the following steps: firstly, carrying out mechanical disassembly and thermal decomposition on a retired photovoltaic module, separating the solder strip and removing organic matters; then, a chlorinating agent is added, the temperature is controlled to range from 300 DEG C to 500 DEG C under the low-oxygen condition for a chlorination reaction, and the tin-lead alloy on the surface of the welding strip is converted into metal chloride and volatile gas with the low volatilization temperature. And through staged heating, tin chloride and lead chloride are collected at 600-700 DEG C and 800-900 DEG C respectively in sequence, residual solid copper is separated through a physical method, and metal copper is obtained. And the collected tin chloride and lead chloride are subjected to reduction or distillation treatment, and metal tin and lead are recovered. Through the temperature control volatilization and selective condensation technology, low-temperature efficient separation and recovery of valuable metal in the solder strip are achieved, the method has the advantages of being easy to operate, low in energy consumption and good in environmental protection property, and a new solution is provided for high-value utilization of waste resources in the photovoltaic industry.

The invention provides an electrochemical pretreatment method for lead-containing heavy sand, and belongs to the technical field of hydrometallurgy. According to the method, through two-step electrolysis, NaCl is electrolyzed, galena in the lead-containing heavy sand is oxidized, lead chloride and elemental sulfur are generated, then manganese salt is electrolyzed, metal sulfide in the lead-containing heavy sand is oxidized, and pretreatment of the lead-containing heavy sand is completed. According to the method, NaCl and Mn < 2 + > can be electrolyzed step by step by regulating and controlling the concentration proportion of NaCl and manganese salt in the electrolyte and the voltage in two-step electrolysis, and reduction of lead in the lead-containing heavy sand and oxidation of metal sulfide are sequentially achieved. According to the pretreatment method, resource recycling of the lead can be achieved, sulfide in the lead can be removed, qualified raw materials are provided for follow-up gold smelting, the method is short in process, convenient to operate, simple in equipment and environmentally friendly, and a valuable technical scheme is provided for the field of precious metal hydrometallurgy.

The invention discloses an efficient leaching method for a tin-lead coating in a welding strip. The efficient leaching method comprises the following steps that 1, a choline-based deep eutectic solvent is prepared; step 2, leaching the choline-based deep eutectic solvent prepared in the step 1 with a welding strip, water and a hydrogen peroxide solution to obtain a leachate; 3, the leachate obtained in the last step is left to stand for half an hour with an excessive 10% diluted hydrochloric acid aqueous solution as a precipitator and then filtered, supernate and white precipitate are obtained, choline chloride, oxalic acid and hydrogen peroxide are adopted to show an excellent leaching effect, a copper matrix is not corroded, a 10% diluted nitric acid aqueous solution is adopted as a precipitator, and the copper matrix is not corroded. The heavy metal lead in the leachate is recycled in the form of lead chloride, and the precipitation yield of the lead can reach 80% or above.

The invention discloses a palladium-lead alloy nanowire, a palladium-lead alloy nanowire catalyst and a preparation method thereof. Ethanol is used as a reaction solvent, polyvinyl pyrrolidone is used as a surfactant, hexadecyltrimethylammonium chloride is used as a coordination agent, hexacarbonyl tungsten is used as a reducing agent, palladium acetylacetonate is used as a palladium source, and lead chloride is used as a lead source to prepare defect-rich high-activity palladium-lead alloy nanowires, and the palladium-lead alloy nanowires are subjected to structural characterization and performance testing. An efficient electrocatalyst is prepared in a carbon-supported manner for electrochemical performance testing. The invention prepares palladium-lead alloy nanowires with controllable morphology, high specific surface area and abundant active sites through a simple and easy, green chemical optimized synthesis method, and then the catalyst is measured by an electrochemical method to have good ORR electrocatalytic activity. The palladium-lead alloy nanowire catalyst can be used as a cathode electrocatalyst for fuel cells and has good electrochemical performance.

The present invention discloses a composition for preparing deep blue light-emitting quasi-two-dimensional perovskites and its application. The raw materials for preparing the composition include cesium bromide, lead bromide, lead chloride, and 2-acryloyloxyethyl N-butylcarbamate. By introducing 2-acryloyloxyethyl N-butylcarbamate as a key additive, the present invention precisely inhibits the overgrowth of the high-n phase (i.e., the perovskite phase with a higher number of layers) in the quasi-two-dimensional perovskites, thereby achieving fine tuning of the optical properties of the perovskite material. When the perovskite thin film emits deep blue light, its photoluminescence quantum yield (PLQY) reaches 93.4%.

The application relates to a lead sulfide quantum dot preparation method, which specifically comprises the following steps: rapidly injecting a ZnS quantum dot solution into a mixed solution of lead chloride and oleylamine to make the solution nucleate; after maintaining for a certain time, rapidly injecting an amine solution of zinc dithiocarbamate; and controlling the size of the synthesized PbS quantum dots by controlling the temperature and the concentration of the sulfur source. The application provides a single precursor zinc dithiocarbamate to replace the ZnS quantum dots as the growth sulfur source, so that the time is saved, and the complex steps of synthesizing the ZnS quantum dots are omitted.

The invention relates to the technical field of flotation, in particular to a flotation reagent and method for recycling copper components in copper slag. The invention provides a flotation reagent for recycling copper components in copper slag. The flotation reagent comprises a composite activating agent and a composite collecting agent. The composite activating agent is prepared from 2, 5-dimercaptothiadiazole and a modifier I; the first modifier is selected from at least one of copper sulfate, copper chloride, copper nitrate, lead nitrate and lead chloride; the composite collecting agent is composed of xanthate and a second modifier. The modifier II is selected from at least one of black powder, thionocarbamate compounds, fatty acid compounds and hydroximic acid. According to the invention, the composite activator highly matched with the copper oxide component in the copper slag is constructed, so that the active sites on the surface of the copper oxide are fully exposed and directionally strengthened; and meanwhile, a composite collecting agent with ultrahigh selectivity on the copper component is introduced, so that copper oxide and copper sulfide are efficiently and synchronously collected in the same process, and deep enrichment and comprehensive recovery of the copper component in the copper slag are achieved.

The application relates to a lead sulfide quantum dot preparation method, which specifically comprises the following steps: rapidly injecting an amine solution of activated zinc dithiocarbamate into a mixed solution of lead chloride and oleylamine to make it nucleate and grow, and adjusting the size of the synthesized PbS quantum dots by adjusting temperature and growth time, etc. A single precursor zinc dithiocarbamate completely replaces ZnS quantum dots as a nucleation and growth sulfur source, does not need to be added dropwise, saves time, omits the complex steps of synthesizing ZnS quantum dots, and can be stably kept at a certain size for a long time without ripening.

The invention relates to the technical field of bismuth refining, and discloses a method for removing lead in bismuth refining, which comprises the following steps: introducing chlorine gas into a bismuth solution in a molten state to enable impurity lead in the bismuth solution to generate lead chloride, and separating the lead chloride from the bismuth solution; in the process of introducing chlorine, air or inert gas is intermittently introduced to stir the bismuth liquid, the interval time is 4-8 h, the continuous introduction time of the air or inert gas is 0.5 h, and the introduction pressure is 2-3 Mpa. The invention further discloses a lead removal device for bismuth refining, and the lead removal device is used for implementing the method. According to the method, lead in the bismuth liquid can be removed, the reaction time can be shortened, the reaction rate can be increased, and the content of lead in the bismuth liquid can be reduced to 10 ppm.

The invention discloses a rare earth smelting lead slag treatment process based on ferric trichloride regeneration cycle, which comprises the following steps: by taking associated ferric iron in rare earth smelting feed liquid as an initial oxidant source, obtaining a 0.6-0.8 mol / L ferric chloride solution through N235 non-saponification extraction-clear water reverse extraction; the method comprises the following steps: performing size mixing on lead slag generated by vulcanizing and removing lead from rare earth feed liquid by using the ferric chloride solution, adding the ferric chloride solution according to 2-3 times of the amount of sulfide in the lead slag, and oxidizing for 1-2 hours; after oxidation, supernate absorbs a rare earth smelting byproduct chlorine through a spray tower, ferrous chloride is regenerated into ferric iron, and the ferric iron is extracted, enriched and recycled through N235 to be used as an oxidizing agent; leaching the oxidized lead slag with hydrochloric acid to recover rare earth, adding 8-16 times by volume of water into the leached slag, heating to 90-110 DEG C by steam to dissolve lead chloride, subsequently cooling and crystallizing or adding calcium hydroxide to adjust the pH value to 7-9 to realize lead recycling, acidifying mother liquor, and then returning to dissolve lead chloride; according to the method, no additional oxidizing auxiliary material needs to be added, hydrogen sulfide is prevented from being generated during acid leaching, the chlorine treatment cost is reduced, and rare earth recovery and lead product high value are synchronously achieved.

The application belongs to the field of perovskite devices, and specifically discloses a bromine-chlorine mixed blue light perovskite film, a preparation method thereof and a perovskite LED device. The preparation raw materials of the bromine-chlorine mixed blue light perovskite film include cesium halide, lead bromide, lead chloride and an alkaline earth metal bromide; the alkaline earth metal bromide includes at least one of calcium bromide, strontium bromide and barium bromide; and the ratio of the mole number of the alkaline earth metal bromide to the total mole number of Pb in the lead bromide and the lead chloride is not greater than 0.5. The alkaline earth metal bromide with a perovskite phase of low solubility is used to dope the bromine-chlorine mixed blue light perovskite, and the mole ratio of the doping amount of the alkaline earth metal bromide is not higher than 0.5, so that the uneven distribution of bromine and chlorine in the blue light perovskite film during the film forming process is improved, the halogen separation under the electric field is inhibited, and the spectral stability is improved; the doping is directly performed in the precursor, the preparation process is simple, and the method is suitable for large-scale industrial production.

The invention relates to the technical field of chemical component analysis, in particular to a method for measuring fluorine in cryolite, and aims to solve the problems that when the fluorine content in the cryolite is measured by adopting a traditional distillation-thorium nitrate titration method or lead fluoride chloride precipitation-mercuric nitrate volumetric method and the like at present, the operation is time-consuming and labor-consuming, the reagent is relatively high in harmfulness and the detection precision is relatively low. The method comprises the following steps: decomposing a cryolite sample by using a sodium carbonate-sodium silicate mixed solvent to enable fluorine to become water-soluble fluoride, generating a lead fluorochloride precipitate by using hydrochloric acid and lead acetate as precipitants, filtering out the precipitate, dissolving the precipitate in nitric acid, precipitating chloride ions by using a silver nitrate standard solution, and measuring the concentration of the excessive silver nitrate by using ferric sulfate as an indicator. Compared with traditional fluorine content determination, the method has the advantages that the detection difficulty is reduced, the use of highly toxic reagents is effectively avoided, the test safety risk is greatly reduced, and the method is widely applicable to determination of fluorine in cryolite for factory inspection.

This invention discloses a method for preparing a blue light-emitting thin film, the blue light-emitting thin film, and a light-emitting device. The method involves dissolving a mixture of cesium bromide, lead bromide, lead chloride, and an organic ligand in dimethyl sulfoxide solvent to obtain a precursor solution. An additional ligand is added to the precursor solution to obtain a perovskite precursor solution. An additive is added to the perovskite precursor solution, and the mixture is stirred for a predetermined first time to obtain a homogeneous solution. The homogeneous solution is then spin-coated in a nitrogen-filled glove box, with an antisolvent added during the spin-coating process to obtain a raw thin film. The raw thin film is annealed and then vacuum-dried to obtain a blue light-emitting perovskite thin film. The above method uses amine salts as organic ligands and small-molecule amine salts as additional ligands, ultimately resulting in a significant improvement in the photoluminescence quantum efficiency, maximum external quantum efficiency, and maximum power efficiency of the prepared blue light-emitting perovskite thin film, as well as achieving high maximum brightness and a stable electroluminescence spectrum.

The invention provides a modified perovskite light absorption layer and a preparation method and application thereof, and the preparation method comprises the following steps: (1) carrying out the one-step evaporation treatment on the surface of a substrate through lead iodide, cesium bromide and lead chloride, and obtaining a first evaporation layer; (2) carrying out two-step evaporation treatment on the surface of the first evaporation layer by using lead iodide, cesium bromide and lead chloride to obtain a second evaporation layer; and (3) carrying out three-step evaporation treatment on the surface of the second evaporation layer by using organic cation amine salt to obtain an organic cation amine salt layer, and carrying out annealing treatment on the obtained material to obtain the modified perovskite light absorption layer, wherein the evaporation rate of the one-step evaporation treatment of lead chloride is gt; the evaporation rate of the two-step evaporation treatment of lead chloride is increased. According to the method for preparing the modified perovskite light absorption layer, the compactness of the thin film can be adjusted, the high perovskite phase conversion degree is promoted, and the quality of the perovskite light absorption layer is improved.

The invention discloses an efficient perovskite quantum dot with a quantum cutting effect and a preparation method thereof. The preparation method comprises the following steps: mixing cesium carbonate, oleic acid and 1-octadecene for reaction to obtain a solution A; mixing and reacting lead chloride, ytterbium chloride, oleic acid, oleylamine and 1-octadecene to obtain a solution B; injecting the solution A into the solution B, reacting, cooling, centrifugally precipitating, and extracting to obtain perovskite quantum dot supernate; mixing metal chloride and absolute ethyl alcohol, dropwise adding the mixture into the supernate, and performing ultrasonic treatment to obtain the efficient perovskite quantum dots with the quantum cutting effect. The method is simple and convenient to operate, does not need harsh reaction conditions, and can remarkably improve the preparation efficiency and reduce the preparation cost; according to the perovskite quantum dot, through the synergistic effect of metal ion doping and the quantum cutting effect, effective passivation of a defect state is achieved on the premise that quantum cutting near-infrared light emission is completely kept, non-radiative recombination is reduced, the overall fluorescence quantum yield is increased, and the comprehensive fluorescence performance is excellent.

The invention discloses a method for deeply purifying and removing impurities before flue gas desulfurization of an industrial furnace, which comprises the following steps: introducing sulfur-containing flue gas subjected to dust removal treatment into a wet washing tower; washing the sulfur-containing flue gas with a soluble metal salt solution to form a dilute sulfuric acid solution containing metal salt as an absorption solution; the obtained absorption liquid is in contact with the treated flue gas to be hydrolyzed, arsenic chloride, hydrogen chloride and lead chloride in the flue gas are converted into arsenate, lead ions and chloride ion soluble salt, the arsenate and metal cations in the absorption liquid are subjected to insoluble arsenate precipitation, and the treated flue gas is the purified and impurity-removed high-sulfur flue gas. By means of the method, arsenic, volatile inorganic matter and other pollutants in the sulfur-containing flue gas can be effectively removed and prevented from entering a subsequent desulfurization system, and the concentration of arsenic, chlorine and other pollutants in desulfurization products is effectively reduced.

The application discloses a kind of photocatalytic material and preparation method thereof, comprising the following steps: cesium chloride, lead chloride and manganese chloride are ground and mixed according to certain proportion, and perovskite quantum dot precursor is obtained;Perovskite quantum dot precursor and molecular sieve carrier are ground and mixed according to certain proportion, and mixture material is obtained;After calcining in inert atmosphere, the photocatalytic material of the application is obtained after curing;The chemical general formula of the photocatalytic material of the application is CsPb 1‑x Mn x Cl3@LTA (x=0, 0.2, 0.4, 0.6, 0.8);The photocatalytic material prepared by the method has the characteristics of simple process, does not contain any organic solvent, is environment-friendly, is convenient for large-scale synthesis, has good stability and excellent photocatalytic performance, and has good industrialization application prospect.

The present invention relates to a lead-based perovskite single crystal, a method for controlling its growth, and applications thereof. The method for controlling the growth of the lead-based perovskite single crystal comprises the following steps: dissolving bromoacetic acid in dimethyl sulfoxide, heating and stirring to obtain a mixed solution; adding the mixed solution and a solvent to a mixture of lead chloride, methylammonium bromide, and lead bromide, stirring and reacting to obtain a precursor solution; filtering the precursor solution and heating to obtain the perovskite single crystal. During the crystal growth process of the present invention, by regulating the nucleation kinetics and maintaining the stability of the growth solution, high-quality perovskite single crystals can be obtained within a short growth period. The contradiction between the growth efficiency of the single crystal and the crystal quality is alleviated by using the nucleation inhibition strategy. Without sacrificing the detector sensitivity, the crystal growth period can be effectively shortened.