54 results about "Cadmium chloride" patented technology

The invention provides marine-derived lactobacillus rhamnosus S400M01 and application thereof, and relates to the technical field of heavy metal adsorption and removal, the marine-derived lactobacillus rhamnosus S400M01 is preserved in Guangdong Microbial Culture Collection Center (GDMCC) on November 28, 2022, the preservation address is Guangzhou, and the number is GDMCCNO: 63001. The strain can tolerate cadmium chloride concentration up to 1000 mg / L, can tolerate lead concentration up to 800 mg / L, can adsorb and remove heavy metals cadmium and lead in squid viscera, and reduces accumulation of cadmium and lead in viscera of live crucian in a heavy metal polluted water body.

The invention discloses a cyanide-free cadmium plating bath solution, a preparation method of the cyanide-free cadmium plating bath solution and application of the cyanide-free cadmium plating bath solution in cadmium plating. The cyanide-free cadmium plating bath solution comprises the following components according to the concentration: 50-70 g / L of cadmium chloride, 180-250 mL / L of an etidronic acid aqueous solution, 16-33 g / L of potassium sodium tartrate, 0.01-0.2 g / L of polyethylene glycol, 0.01-0.2 g / L of a brightener and 0.01-0.1 g / L of an additive HY. The method has the advantages that the bath solution is environment-friendly and non-toxic, wastewater treatment is simple, a plating layer is high in deposition speed, fine in crystallization and good in binding force, the problems that cyanide cadmium plating pollutes the environment, EDTA cadmium plating is poor in stability and the like are effectively solved, and the method has good application value and economic and social benefits.

The invention discloses a modified hollow cadmium sulfide photocatalytic reducing agent and a preparation method and application thereof, and belongs to the technical field of wastewater treatment.The preparation method comprises the steps that silicon dioxide microspheres and deionized water are mixed to prepare suspension liquid, a sodium citrate aqueous solution, a cadmium chloride aqueous solution, ammonia water and a thiourea aqueous solution are added into the suspension liquid, the mixture is stirred to be uniform and then heated for a reaction, and the modified hollow cadmium sulfide photocatalytic reducing agent is obtained; preparing to obtain a silicon dioxide and cadmium sulfide composite material; immersing the silicon dioxide and cadmium sulfide composite material into a sodium hydroxide solution, heating and etching to obtain nano hollow cadmium sulfide; the preparation method comprises the following steps: immersing nano hollow cadmium sulfide into a 1-octadecene solution, carrying out heating reaction, and carrying out alcohol washing and drying to obtain the modified hollow cadmium sulfide photocatalytic reducing agent. The modified hollow cadmium sulfide composite photocatalyst is synthesized through a silicon dioxide template method and a thermal decomposition method, and high-concentration methyl orange industrial wastewater can be efficiently degraded under the condition of visible light irradiation.

The plating solution comprises the following components and process parameters: 25-35 g / L of cadmium chloride, 4-6 g / L of ferrous chloride tetrahydrate, 100-140 g / L of potassium chloride, 100-140 g / L of a coordination agent, 1.5-2.5 mL / L of a leveling agent, 1.5-2.5 mL / L of a brightening agent, 25-30 mL / L of an auxiliary agent and 25-35 g / L of a stabilizer, the pH value of the plating solution is 6-8, the temperature of a plating tank is 20-35 DEG C, the cathode current density is 0.5-1.5 A / dm < 2 >, and the cathode movement is 2-4 m / min. According to the prepared cadmium-plated iron alloy sample piece subjected to color passivation through hexavalent chromium, the surface of the sample piece is free of white rust in an acetate mist test for 520 h according to GB / T 10125-2021 Artificial Atmosphere Corrosion Test Salt Spray Test, and a plating layer has excellent corrosion resistance.

The invention provides an efficient light-emitting perovskite quantum dot for an LED and a preparation method and application of the efficient light-emitting perovskite quantum dot, according to the method, cesium chloride and cadmium chloride are used as main raw materials, the light-emitting efficiency is improved through tin ion doping, and efficient light-emitting perovskite is prepared. According to the perovskite prepared by the invention, a simple hydrothermal reaction process is utilized, and the purity and the yield of the product are improved to the maximum extent. According to the invention, environment-friendly raw materials different from the traditional lead-containing perovskite are adopted, and by improving the traditional process and adding the dopant, the luminous efficiency is greatly improved, and the influence on the environment is reduced at the same time. The perovskite prepared by the invention is simple in process, low in cost, high in luminous efficiency and easy for industrial and large-scale production, achieves the purpose of the invention, can be applied to an LED (Light Emitting Diode), and is particularly suitable for a high-resolution display screen and a high-efficiency light source. In addition, due to high color purity and stable light output performance, the invention has a wide application prospect in commercial and consumer electronics.

The invention provides a device for detecting a cadmium chloride thin film based on a conductivity meter and a detection method thereof, and relates to the field of solar thin film cells. Comprising a dissolving tank, a weight block and a sealing ring, the bottom of the dissolving tank is provided with a first opening which can be in contact with a cadmium chloride film, and the top of the dissolving tank is provided with a second opening through which a conductivity meter can enter and exit; the sealing ring is arranged at the first opening, and the weight bearing block is connected with the outer wall of the dissolving tank. The detection method comprises the following steps: adding quantitative deionized water into the dissolving tank, and testing the conductivity of liquid in the dissolving tank by using a conductivity meter after the cadmium chloride film in the dissolving tank is dissolved; the cadmium chloride concentration corresponding to the conductivity is calculated through a cadmium chloride concentration-conductivity curve graph, and the thickness of the cadmium chloride thin film at the sampling point is calculated based on the amount of deionized water added into the dissolving tank and the area of the cadmium chloride thin film in the dissolving tank; the device and the method are low in detection cost, short in time and high in precision.

The invention belongs to the technical field of photocatalytic hydrogen evolution, and discloses preparation and application of a platinum monatomic modified zinc cadmium sulfide catalyst. Aiming at the urgent demand of clean energy under energy crisis and the problems of insufficient efficiency, complex preparation, high cost and the like of the existing photocatalytic hydrogen evolution material, the invention aims to provide a catalyst which is simple and convenient in process, controllable in cost and excellent in hydrogen evolution performance. According to the preparation method, zinc acetate, cadmium chloride, thiourea, polyvinylpyrrolidone, potassium tetrachloroplatinate and a hydrazine hydrate solution are taken as raw materials, and precise modification and stable loading of platinum single atoms on the surface of zinc cadmium sulfide are realized through combination of a hydrothermal synthesis method and a photodeposition technology. The catalyst shows excellent catalytic activity and long-term stability in the field of photocatalytic hydrogen evolution, the hydrogen evolution efficiency can be remarkably improved, an efficient solution is provided for clean energy development, and the application value is wide.

The present invention relates to the field of quantum dot materials, and in particular to a lens material based on quantum dots, and a preparation method and application thereof. The present application discloses a lens material based on quantum dots, and the raw materials for preparation include: a quantum dot precursor, an acrylic compound, an initiator, and a quantum dot stabilizer. The raw materials for preparing the quantum dot precursor include: a cadmium source solution, a sulfur source solution, an oxysilane substance, and a sulfonate substance. The cadmium source is selected from at least one of cadmium oxide, cadmium nitrate, and cadmium chloride; the sulfur source is selected from at least one of sulfur powder, sodium sulfide, cysteine, and thioacetamide. The polymer coating can effectively isolate oxygen, moisture, etc., avoid quantum dot fluorescence quenching and inactivation, and improve the stability of the quantum dot lens material. Moreover, the luminous efficiency is high, the photoluminescence quantum yield (PLQY) is greater than 60%, the brightness decay after photothermal aging is less than 15%, and the transmittance is greater than 90%.

The invention relates to the technical field of metal organic framework materials, particularly discloses a fluorescent chiral Cd-MOF sensor and also discloses application of the fluorescent chiral Cd-MOF sensor. The fluorescent chiral Cd-MOF sensor provided by the invention is prepared by taking cadmium chloride and 1, 4-naphthalic acid as raw materials through a solvothermal method. The sensor has an excellent fluorescence luminescence property, and can detect methyl orange based on the fluorescence intensity of the sensor.

The invention belongs to the technical field of electrocatalytic materials, and particularly relates to an electrocatalyst with a saturated coordination zinc diatom structure, a preparation method and application. Based on the principle that the boiling point of zinc chloride is lower than that of cadmium chloride and the boiling point of elemental cadmium is lower than that of elemental zinc, ZIF-8 serves as a precursor and is heated together with cadmium chloride, Zn in ZIF-8 can be volatilized at high temperature, Zn in ZIF-8 is replaced by cadmium chloride in the high-temperature process, cadmium (II) is reduced into elemental cadmium (Cd) steam by carbon generated by pyrolysis, and the elemental cadmium (Cd) steam leaves a reaction system; and finally, the catalyst (Zn DACs / N-C) with an excellent ORR performance and a zinc diatom structure is synthesized, and is expected to become a catalyst in fuel cell cathode reaction, automobile exhaust removal and organic reaction.

The application discloses concentric circle nanosheets and a preparation method and application thereof, and the preparation method of the concentric circle nanosheets comprises the following steps: (S1) mixing sodium citrate, cadmium chloride and zinc chloride in water to obtain a flocculent solution; (S2) adding ammonia water and thiourea into the flocculent solution in the step (S1) and heating to react, so that the concentric circle nanosheet is prepared. 1‑x Zn x The application firstly prepares Cd 1‑x Zn x S@CdCN2 concentric circle nanosheet, then Cd 1‑ x Zn x S@CdS concentric circle nanosheet and Cd 1‑x Zn x S@CdS-Ni(OH)2 concentric circle composite nanosheet are prepared through in-situ sulfuration and photodeposition methods respectively. In the concentric circle composite nanosheet, CdCN2 is converted into CdS through a sulfuration reaction, and Ni(OH)2 is deposited on the Cd 1‑x Zn x S central particle through a photodeposition reaction.

The invention relates to the technical field of chemical component detection, and particularly discloses fluorescent test paper, a fluorescence analysis method and a fluorescence analysis device for visual online detection of soil nitrate nitrogen. According to the test paper, nitrate nitrogen is reduced into nitrite nitrogen by adopting zinc powder and a cadmium chloride solution, and then the nitrite nitrogen is dropwise added to fluorescent test paper prepared by soaking a mixed solution of para aminobenzoic acid, N-phenyl-1-naphthylamine and hydrochloric acid; under an acidic condition, nitrite nitrogen and para aminobenzoic acid generate diazonium salt, and then the diazonium salt reacts with N-phenyl-1-naphthylamine to form an azo compound, so that the original blue fluorescence on the test paper is gradually weakened along with the increase of the concentration of the nitrate nitrogen. According to the method, high-sensitivity and specific recognition of nitrate nitrogen is realized. And in combination with color identification and data analysis software of a smart phone, a portable and low-cost field detection system is constructed, and an efficient and practical new technical means is provided for visual quantitative detection of soil nitrate nitrogen.

The invention relates to preparation and application of a narcissus-shaped zinc cadmium sulfide solid solution photocatalyst in the field of photocatalytic hydrogen evolution. The invention aims to provide the narcissus-shaped zinc cadmium sulfide solid solution photocatalyst which is simple and convenient in preparation process and low in cost and has efficient photocatalytic hydrogen evolution performance, so that the photocatalytic hydrogen evolution efficiency is improved, and the urgent demand on clean energy under the current energy crisis is relieved. According to the adopted method, zinc acetate, cadmium chloride, thiourea and polyvinylpyrrolidone serve as raw materials, a one-step hydrothermal synthesis method is adopted, and the prepared narcissus-shaped zinc cadmium sulfide solid solution can be suitable for the field of photocatalytic hydrogen evolution and has high catalytic activity and stability.

The invention discloses a preparation method of a metal-organic hybrid glass heterojunction with ultra-long phosphorescence and application of the metal-organic hybrid glass heterojunction in information encryption. According to the method, 1-carboxymethyl-3-methylimidazolium chloride and cadmium chloride are subjected to self-assembly to synthesize a novel metal-organic hybrid material, and then crystalline state-liquid-glass multiphase transformation is carried out. The obtained metal-organic hybrid glass shows multi-amorphous property, and provides possibility for changing local order degree and heterogeneity. Further, the prepared metal-organic hybrid glass heterojunction material with ultra-long phosphorescence can be shaped under a heating condition, and a multi-color block heterojunction is realized in single large-size glass. According to the invention, the multi-amorphous transformation of the metal-organic hybrid glass is displayed, the visible and controllable multicolor heterojunction material is developed by using the arbitrary processability of the glass, and the method has wide application in the fields of optical information encryption and the like.

The application relates to the field of water quality detection, in particular to a paper-based nitrate ion detection chip and a preparation method and application thereof. The paper-based nitrate ion detection chip comprises a bottom plate and a paper-based layer on the bottom plate; the paper-based layer comprises a color developing area, a reduction area and a sample inlet area which are sequentially communicated; a detection reagent is pre-fixed in the color developing area, the detection reagent comprises glucose, p-aminobenzenesulfonic acid, N-1-naphthyl ethylenediamine and ascorbic acid; a reduction reagent is pre-fixed in the reduction area, the reduction reagent comprises zinc powder and cadmium chloride; the detection reagent solution is added to the color developing area and then freeze-dried, so that the detection reagent is pre-fixed in the color developing area. The freeze-drying technology is used to uniformly pre-fix the detection reagent on the filter paper, a loose structure is formed, the color developing uniformity of the detection reagent after reacting with nitrate ions can be effectively improved, and the reaction time is reduced.

The present invention relates to the field of metal-organic framework materials technology, specifically disclosing a fluorescent chiral Cd-MOF sensor and its applications. The fluorescent chiral Cd-MOF sensor provided by the present invention is prepared using cadmium chloride and 1,4-naphthalenedicarboxylic acid via a solvothermal method. The sensor exhibits excellent fluorescence properties and can detect methyl orange based on its fluorescence intensity.

The preparation method comprises the following steps: preparing an electron transport layer on FTO glass, preparing an active absorption layer on the electron transport layer, carrying out cadmium chloride treatment on the active absorption layer to passivate defects, preparing a cuprous thiocyanate layer or a nickel oxide layer on the active absorption layer as a hole transport layer, and preparing a hole transport layer on the hole transport layer. When the hole transport layer is a nickel oxide layer, a cuprous thiocyanate layer is prepared on the hole transport layer, annealing is performed at 250 + / -5 DEG C for 10-30 min to diffuse copper to an FTO glass interface, and a transparent electrode is prepared on the surface of the cuprous thiocyanate layer. High-temperature annealing treatment is carried out after the cuprous thiocyanate layer is prepared, copper is fully diffused and doped to the active absorption layer, the P-type doping concentration is improved, an extremely narrow built-in electric field is obtained, the carrier collection narrowing effect is achieved, and the advantages of being high in stability, long in service life, high in response speed and high in efficiency are achieved. The invention has the advantages of simple structure, high responsivity, strong band selectivity, adjustable response band width, narrow full width at half maximum and the like.

The invention belongs to the technical field of preparation of X-ray storage materials, and discloses a long-afterglow scintillator, a scintillator film and a preparation method of the long-afterglow scintillator film. The preparation method of the long-afterglow scintillator comprises the following preparation steps: mixing a manganese precursor solution with a cadmium precursor solution, and then adding a cesium precursor solution to obtain the long-afterglow scintillator, the manganese precursor solution is a mixed solution of manganese chloride and hydrochloric acid; the cadmium precursor solution is a mixed solution of cadmium chloride and hydrochloric acid; the cesium precursor solution is a mixed solution of cesium chloride and hydrochloric acid. The long-afterglow scintillator is prepared by adopting a simple coprecipitation method, the operation is simple and convenient, a long-time high-temperature calcination process is avoided, and the preparation time consumption is remarkably shortened; large-scale production of the scintillator powder can be achieved, and meanwhile it is guaranteed that the product has high purity.

The invention discloses a cadmium telluride thin film battery cadmium chloride spraying monitoring and control system and method. The system comprises a material preparation module used for preparing and storing a cadmium chloride solution containing a cadmium ion fluorescent probe; the spraying module is used for uniformly spraying the solution containing the probe to the surface of the cadmium telluride substrate to form a liquid film; the on-line detection module is used for collecting a liquid film fluorescence image through an optical detection unit and measuring the conductivity of the liquid film in a non-contact manner through a conductivity detection unit; and the data processing and control module is used for carrying out fusion analysis on the fluorescence image and the conductivity data, calculating the coverage rate, the uniformity and the cadmium chloride content of the liquid film in real time, and dynamically adjusting spraying parameters and probe injection parameters according to an analysis result, so as to realize closed-loop accurate control of the coating process. The problems that in the prior art, real-time performance is poor, blind areas exist in microcosmic distribution detection, and control precision is insufficient are effectively solved, and the consistency of the coating technology and the material utilization rate are improved.

The invention belongs to the field of biology, and particularly relates to a rhododendron molle heat shock protein RmHSP20-5 gene and application thereof. The RmHSP20-5 gene participates in response of rhododendron molle to high-temperature stress, and can be used for screening high-temperature tolerance germplasm of rhododendron molle and evaluating high-temperature tolerance of sheep. When the gene is transferred into a prokaryotic expression strain, the growth of the transgenic strain under low-temperature stress, high-temperature stress, sodium chloride stress and cadmium chloride stress is obviously improved, and a new candidate gene resource is provided for cultivating transgenic plants or microorganisms with excellent shapes such as heavy metal resistance and high-temperature stress resistance; and an important reference is provided for mining of the heat-resistant gene of the azaleaceae plant.

The invention discloses a preparation method and application of a selenium-doped CdS / MoS2 heterojunction, and the preparation method comprises the following steps: preparing selenium-doped cadmium sulfide nanoparticles by using selenium powder as a selenium source, cadmium chloride as a cadmium source and thiourea as a sulfur source through a hydrothermal method, and successfully preparing a selenium-doped CdS / MoS2 heterojunction composite material by using ammonium molybdate as a molybdenum source through a hydrothermal method. Selenium doping obviously widens the visible light absorption range of cadmium sulfide, and the cadmium sulfide can be used for photocatalytic degradation of organic pollutants, hydrogen production through photoelectrochemical water decomposition, solar cell interface layers or photoelectrochemical sensors.

The invention discloses a flexible metal-organic hybrid halide with full-phosphorescence optical waveguide characteristics and a preparation method and application thereof. According to the invention, a pyridine derivative and cadmium chloride are self-assembled to synthesize a novel metal-organic hybrid halide material. By regulating the intermolecular acting force of the metal-organic hybrid halide crystal, the elastic deformation and plastic deformation of the material can be respectively realized by utilizing the buffer layer and the molecular slippage region. Meanwhile, due to the rigidity of a molecular aggregation structure, the material shows obvious full phosphorescence emission. The flexible metal-organic hybrid halide prepared by the invention is mechanically stripped, and a multi-channel optical waveguide can be realized in a single crystal. The invention not only shows the mechanical flexibility of the metal-organic hybrid halide, but also develops a multi-channel active full-phosphorescence optical waveguide material by utilizing a molecular slippage region of a crystalline material, and has wide application in the fields of optical information communication and the like.

The present application relates to a kind of methods for establishing cadmium-induced silkworm liver injury model, comprising: according to the proportion of 10 g mulberry leaf and 1 ml concentration 125 mg / L cadmium chloride solution corresponding to every 25 g silkworm body weight, cadmium chloride solution is evenly applied to the back of mulberry leaf and air-dried, and mulberry leaf is treated with clean water as control;Select five age first day silkworm and divide into model group and blank group, under the condition of controlling temperature and humidity, respectively feed after processing mulberry leaf, calculate the amount of mulberry leaf and solution according to the real-time body weight of silkworm before each feeding, every 12 hours once and continuously feed for 5 days;After feeding, fasting for 12 hours, the weight gain rate of two groups of silkworms, AST and ALT activity in hemolymph are determined, and fat body is observed by histological section;When the weight gain rate of model group is significantly lower than blank group, AST and ALT activity is significantly higher than blank group and the pathological characteristics of karyopyknosis and loose tissue appear in fat body, it is determined that model is established successfully.

The invention discloses a preparation method of an Er-doped CdIn2S4 photocatalyst for photocatalytic degradation of methylene blue, which comprises the following steps: adding cadmium chloride, indium chloride tetrahydrate and thioacetamide into deionized water, and carrying out hydrothermal reaction to prepare the CdIn2S4 photocatalyst; in the same reaction system, Er (NO3) 3.5 H2O is added according to different proportions of the molar weight of indium trichloride tetrahydrate, and three samples with different Er doping concentrations are obtained. The photocatalytic performance of CdIn2S4 is effectively regulated and controlled through Er doping, the separation efficiency of photon-generated carriers is remarkably improved, and meanwhile the light absorption capacity of the material is enhanced. More adsorption sites and active sites are exposed on the surface of the modified catalyst, so that the degradation efficiency of methylene blue is greatly improved. The method has the remarkable advantages of being simple in preparation process, low in cost, easy to recycle and the like, and shows a good application prospect in the field of dye wastewater treatment.

The invention relates to the technical field of semiconductors, and discloses a preparation method of a cadmium telluride thin film battery, which comprises the following steps: forming a transparent conductive layer on one side of a glass substrate; forming a composite battery layer on the surface of one side, back to the glass substrate, of the transparent conductive layer; carrying out a multi-step cadmium chloride heat treatment process on the composite battery layer; the multi-step cadmium chloride heat treatment process sequentially comprises a first heat treatment stage, a second heat treatment stage and a third heat treatment stage; the heat treatment temperature of the first heat treatment stage is a first temperature; the heat treatment temperature of the second heat treatment stage is a second temperature; the heat treatment temperature of the third heat treatment stage is a third temperature; the second temperature is higher than the first temperature; the third temperature is lower than the second temperature; the third temperature is greater than or equal to the first temperature; the second temperature is greater than 450 DEG C; and forming a back cell layer on the surface of the composite cell layer. The surface defects of the cell layer can be reduced, the grain size of cadmium telluride and the thickness of the composite cell layer are increased, and the performance and the photoelectric conversion efficiency of the cell are improved.

The invention relates to the technical field of photocatalysts, in particular to a Cu-CdS-NRs photocatalyst as well as a preparation method and application thereof. A preparation method of a Cu-CdS-NRs photocatalyst comprises the following steps: S1, mixing and stirring cadmium chloride, water, copper nitrate and sodium diethyldithiocarbamate according to a certain ratio, standing, collecting white precipitate, washing and drying to obtain a brown precursor; s2, the precursor is dissolved in ethylenediamine for a hydrothermal reaction, centrifugal washing and drying are carried out, and the Cu-CdS-NRs photocatalyst is obtained. The Cu-CdS-NRs photocatalyst is used for selectively reducing and substituting nitrobenzene through photocatalysis, has high catalytic efficiency and has high selectivity on a corresponding product.

The invention discloses an rGO / CdS / MIL-101 (Fe) catalyst as well as a preparation method and application thereof, and belongs to the technical field of water treatment. The ternary heterojunction catalyst is prepared by adopting a two-step method: firstly, mixing ferric trichloride hexahydrate, terephthalic acid and reduced graphene oxide in N, N-dimethylformamide, and synthesizing rGO / MIL-101 (Fe) through solvothermal reaction; and dispersing the rGO / CdS / MIL-101 (Fe) catalyst in a cadmium chloride ethanol solution, adding sodium sulfide, and stirring for reaction to obtain the rGO / CdS / MIL-101 (Fe) catalyst. The degradation rate of the catalyst under the conditions of 0.3 g / L dosage and 30 mg / L antibiotic concentration after visible light irradiation for 30 min reaches 92.66%, the degradation rate is still kept to be close to 80% after circulation for 4 times, and the main active species are holes.

The application provides an aluminum cluster-based metal organic framework material, a preparation method and application. The material is prepared by a solvothermal reaction with aluminum isopropoxide and cadmium chloride as metal sources and isonicotinic acid as an organic ligand, and has a chemical formula of {Al2CdCl[(CH2O)2]3INA·DMF·0.5H2O} n , has a three-dimensional framework and one-dimensional channels, a BET specific surface area of 332.9 m 2 ·g ‑1 , a minimum pore size of 0.59 nm, a porosity of 41.7%, an adsorption capacity of propylene of 38.5 cm 3 ·g ‑1 at 298 K and 5 kPa, and an adsorption selectivity of 2.5 times for ethylene. The adsorption selectivity of the material for a propylene / ethylene mixed system is not less than 4.0. The application has the advantages of mild process, simple operation, easy availability of raw materials, excellent adsorption selectivity performance of the product, and application in ethylene / propylene adsorption separation and olefin purification, and solves the problems of high energy consumption and complex process in traditional separation.

The invention relates to a preparation method and application of a layered double-perovskite micro-crystal material, and belongs to the field of perovskite micro-crystal materials. Aiming at the defects of poor stability, high photogenerated charge recombination rate, low product selectivity and the like of a traditional perovskite photocatalyst, a Cs4Cd0. 8Cu0. 2Bi2Cl12 layered double-perovskite system is constructed through a Cu doping strategy. The preparation method comprises the following steps: dissolving cadmium chloride, copper chloride and bismuth chloride in hydrochloric acid, then adding cesium chloride, carrying out a low-temperature (60 DEG C) heating reaction, and then carrying out centrifugal cleaning and drying to obtain the micro-crystal material. According to the invention, the yield of CH4 is successfully increased to 7.2 [mu] mol / (g.h) (about 260% higher than that of an undoped system). The material keeps a stable structure after a photocatalytic reaction, has a visible light response characteristic, and breaks through the dependence of a traditional catalyst on ultraviolet light. The preparation process adopts a low-temperature solution method, the reaction time is less than 10 minutes, the energy consumption is reduced by about 60%, and low-cost large-scale production is realized.

The invention relates to preparation and application of a zinc oxide and cadmium sulfide heterojunction modified by a platinum single atom in the field of photocatalytic hydrogen evolution. The invention aims to provide the heterojunction which is simple and convenient in preparation process and low in cost and has efficient photocatalytic hydrogen evolution performance, so that the photocatalytic hydrogen evolution efficiency is improved, and the urgent demand on clean energy under the current energy crisis is relieved. According to the preparation method, zinc acetate, cadmium chloride, thiourea, polyvinylpyrrolidone, potassium tetrachloroplatinate and sodium borohydride are taken as raw materials, a hydrothermal synthesis method is combined with a photodeposition technology, and the prepared platinum single atom modified zinc oxide and cadmium sulfide heterojunction can be applied to the field of photocatalytic hydrogen evolution and has relatively high catalytic activity and stability.