111 results about "Cadmium sulphide" patented technology

The invention relates to a heterojunction composite material and a preparation method and application thereof, and belongs to the technical field of catalysts. The preparation method of the heterojunction composite material comprises the following steps: dispersing nano cadmium sulfide in water to obtain a nano cadmium sulfide dispersion liquid, then adding a triazinyl covalent organic framework, fully reacting at 75-85 DEG C, centrifuging, precipitating, washing and drying to obtain the heterojunction composite material. The narrow-band-gap semiconductor cadmium sulfide and the wide-band-gap semiconductor triazinyl covalent organic framework are compounded to form the heterojunction structure composite material photocatalyst, and the narrow-band-gap semiconductor cadmium sulfide and the wide-band-gap semiconductor triazinyl covalent organic framework interact with each other, so that the response range of sunlight is widened, separation and transfer of photo-induced electrons and holes are promoted, and the photoelectric conversion efficiency is improved. Therefore, the photocatalytic oxidation-reduction capacity of the catalyst is improved, and the photocatalytic performance of the catalyst is finally improved. The heterojunction composite material can be applied to the field of cleaning and environmental protection as a photocatalyst, and has excellent hydrogen production efficiency.

A photovoltaic device is presented. The photovoltaic device includes a layer stack; and an absorber layer is disposed on the layer stack. The absorber layer comprises selenium, wherein an atomic concentration of selenium varies across a thickness of the absorber layer. The photovoltaic device is substantially free of a cadmium sulfide layer.

The invention provides a preparation method of a red light perovskite quantum dot with a core-shell structure, and belongs to the technical field of quantum dot preparation. According to the method, a CsPbI3 quantum dot coarse solution and a cadmium sulfide precursor solution are mixed, stirred and heated to a certain temperature, cadmium sulfide grows on the surface of the quantum dot in an epitaxial mode, the red light CsPbI3 / CdS core-shell quantum dot is prepared, the formation of a core-shell structure is beneficial to passivation of defects on the surface of the quantum dot, and meanwhile ion migration and Auger recombination of the quantum dot are inhibited. The invention provides a solution for preparing the red light perovskite quantum dot light-emitting diode with high external quantum efficiency, long service life and low efficiency roll-off.

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 invention relates to a photocatalytic fuel cell based on a cadmium sulfide titanium dioxide composite photo-anode and application, and relates to the technical field of preparation of novel photo-electrode materials, the cell adopts a continuous ion deposition method to prepare a CdS quantum dot modified TiO2 photo-anode with a specific layer number, and the CdS quantum dot modified TiO2 photo-anode, a platinum cathode and an ion exchange membrane form a synergistic system. The layer number and the particle size of CdS quantum dots in the photo-anode are accurately controlled, an efficient heterojunction structure is constructed, and the visible light utilization and charge separation efficiency is improved to the maximum extent; a chemical bonding effect is formed on the surface of the photo-anode by using carboxyl-containing organic fuel, so that an electron transmission path is obviously accelerated; the dual functions of organic wastewater degradation and electric energy synchronous output are achieved, and long-term operation stability is kept. The technology provides an efficient and low-consumption solution for resourceful treatment of industrial organic wastewater.

The application discloses an oxide-sulfide S-type heterojunction composite photocatalyst as well as a preparation method and application thereof. x The oxide-sulfide S-type heterojunction composite photocatalyst is prepared by adding WO x into ethanol, uniformly ultrasonic dispersing, and then performing heating and dry distillation. The application successfully constructs a tungsten oxide and cadmium sulfide heterojunction, has good light response, utilizes a heterojunction interface formed by the two catalysts and having a synergistic effect, improves the photocatalytic hydrogen production capacity, and promotes selective oxidation of benzyl alcohol. The application has simple operation and good repeatability.

A dual-modal information storage and anti-counterfeiting material, and its preparation method are provided. The dual-modal information storage and anti-counterfeiting material uses cadmium sulfide quantum dots (CdS QDs) as information storage material, and uses the controllable photocorrosion of CdS QDs to achieve dual-modal optical information storage and anti-counterfeiting applications. Firstly, the type of ligands and modification degree of CdS QDs are precisely controlled during the aqueous phase synthesise process, so as to effectively control the photocorrosion phenomenon under UV light irradiation. Subsequently, the CdS QDs are loaded in the hydrogel network, and they are also loaded on the substrates such as cloth and paper by spray coating, dip coating or 3D printing, and the information is stored by digital light patterning. Different from the photochromic function of traditional anti-counterfeiting material, the CdS QDs shows dual-modal patterning characteristics in a wide wavelength range.

The application discloses a kind of passivated antimony selenide (Sb2Se3) thin film solar cell and preparation method, the cell from bottom to top includes in turn: indium tin oxide (ITO) transparent conductive glass front electrode substrate, cadmium sulfide (CdS) electron transport layer, Sb2Se3 absorption layer, polyvinylidene fluoride-trifluoroethylene copolymer P (VDF-TrFE) passivation layer and gold (Au) back electrode layer.The passivated antimony selenide (Sb2Se3) thin film is P (VDF-TrFE) thin film in Sb2Se3 absorption layer surface spin coating, and the surface deep level defect of passivation film is passivated.The advantages of the application are that the scientific problem that Sb2Se3 semiconductor thin film surface deep level defect causes Sb2Se3 solar cell open-circuit voltage to be low is successfully solved by P (VDF-TrFE) thin film strategy, so as to improve the performance of Sb2Se3 thin film solar cell.This innovative technology provides an important technical solution for preparing high-efficiency and low-cost Sb2Se3 thin film solar cell.

The application discloses a kind of hollow microspheres of titanium dioxide / cadmium zinc sulfide heterojunction with zinc, oxygen double vacancies, the preparation method of the catalyst of the hollow microspheres of titanium dioxide / cadmium zinc sulfide heterojunction and the catalyst application of the hollow microspheres of titanium dioxide / cadmium zinc sulfide heterojunction.The hollow microspheres of titanium dioxide / cadmium zinc sulfide heterojunction with zinc, oxygen double vacancies of the application, the preparation method of the catalyst of the heterojunction hollow microspheres and the preparation method of the application of the double vacancies heterojunction hollow microspheres are in situ preparation method using one-step hydrothermal method, and double vacancies heterojunction is constructed on the surface of titanium dioxide hollow microspheres, which has the advantages of high activity stability, simple preparation process and controllable reaction conditions.The heterojunction hollow microspheres have wide visible light absorption range, low photo-generated charge recombination rate, and exhibit excellent photocatalytic reduction of carbon dioxide and photocatalytic oxidation of benzyl alcohol activity and good stability.

The invention relates to the technical field of solar cells, and discloses a method for preparing a semiconductor thin film solar cell, which comprises the following steps of: S1, cleaning a substrate: carrying out ultrasonic cleaning on the substrate by using deionized water, alcohol and alkali liquor in sequence; s2, positive electrode deposition: depositing a molybdenum film on the substrate through a magnetron sputtering method; s3, preparing a precursor film: preparing the precursor film by using a sol-gel method; s4, selenylation annealing: putting the precursor film, selenium particles and tin disulfide into a graphite box; s5, buffer layer deposition: depositing a cadmium sulfide buffer layer on the absorption layer through a chemical bath method; s6, depositing a window layer; s7, depositing a negative electrode; and S8, packaging. The tin disulfide atmosphere is introduced in the annealing process, element distribution and crystal quality of the copper-zinc-tin-sulfide thin film are further optimized, composition segregation is effectively inhibited, and the composite defect density in the material is reduced. And the absorption layer has more excellent crystallization characteristics, so that the photoelectric conversion efficiency is remarkably improved.

The invention provides a preparation method of a carbon quantum dot / phosphotungstic acid / cadmium sulfide composite photocatalyst, and belongs to the technical field of photocatalytic degradation and water photolysis hydrogen production. Comprising the following steps: dissolving a cadmium source and a sulfur source in an ethylenediamine solution, stirring the mixture until the mixture is uniform, carrying out hydrothermal reaction, and treating a product to obtain cadmium sulfide solid powder; the preparation method comprises the following steps: adding a carbon source into deionized water, performing ultrasonic treatment, performing microwave reaction, and filtering, washing and drying a product to obtain carbon quantum dot solid powder; the preparation method comprises the following steps: mixing phosphotungstic acid, cadmium sulfide solid powder and carbon quantum dot solid powder in deionized water, uniformly stirring, carrying out hydrothermal reaction, and centrifuging, filtering and washing a product to obtain the carbon quantum dot / phosphotungstic acid / cadmium sulfide composite photocatalyst. The photocatalytic performance of cadmium sulfide is effectively improved, the degradation effect on organic pollutants is excellent, the strong water photolysis hydrogen evolution effect is achieved, the preparation technology is simple, cost is low, and industrial application and environment restoration are facilitated.

The invention provides a method for high-efficiency electrocatalytic reduction of carbon dioxide by an ionic liquid system cooperating with a cadmium sulfide catalyst. The electrocatalytic reduction process of the method is carried out by placing a three-electrode system in an H-shaped electrolytic cell filled with ionic liquid. The three-electrode system comprises a reference electrode, a counter electrode and a working electrode, the silver / silver ion electrode is the reference electrode, the platinum net electrode is the counter electrode, and a cadmium sulfide catalyst which is loaded on carbon paper and has a large specific surface area and high conductivity is the working electrode. The method specifically comprises the following steps: mixing a cadmium sulfide catalyst with acetone, adding a Nafion solution, carrying out ultrasonic treatment to obtain a uniformly mixed suspension, uniformly dispensing the suspension on carbon paper, and naturally airing at room temperature to obtain a working electrode; and placing the working electrode in the ionic liquid-acetonitrile-aqueous solution electrolyte, and continuously introducing carbon dioxide gas to carry out a constant-potential electrochemical reduction reaction. The electro-catalysis system is easy to operate and mild in reaction condition, the preparation method of the cathode catalyst is simple, industrial development value is achieved, and an important and practical way is provided for fixation and recycling of carbon dioxide.

The application relates to application of Bi2O2Se in a photocatalytic nitrogen fixation reaction and belongs to the technical field of photocatalytic nitrogen reduction. The BOS catalyst with intrinsic weak hole oxidation capacity realizes efficient and stable photocatalytic ammonia synthesis without a sacrificial agent. The BOS has an optimized narrow band gap structure and a unique straddling energy band arrangement, the valence band position is shallow, the hole oxidation capacity is weak, the oxidation degradation of NH4 + Can be effectively inhibited, and the conduction band position is suitable, so that the thermodynamic driving force of nitrogen reduction is ensured. The catalyst has excellent light absorption capacity in a wide spectral range (extending to the near-infrared region), and the apparent quantum efficiency reaches 0.12% at a wavelength of 700 nm. The ammonia synthesis rate of the BOS without a sacrificial agent reaches 61 muM.h ‑1 -1, which is 8.3 times and 2.8 times that of carbon nitride and cadmium sulfide, and the catalyst maintains high activity in an air atmosphere, has excellent oxygen compatibility and cycle stability.

The invention discloses a simple preparation method of a monocluster polyacid / three-dimensional ordered macroporous cadmium sulfide coupled catalyst for efficient photocatalytic water desorption of hydrogen. Single-cluster uniform dispersion of Sb9 on 3DCdS is realized by a room-temperature impregnation method, and the coupling material is simple in preparation method, mild in reaction condition and low in cost. Under the driving of visible light, the hydrogen desorption yield of water within 6 hours can reach 206.2 [mu] mol, which is 9 times of that of single 3DCdS. The high specific surface area and the stable macroporous structure of the material expose more active centers for the reaction, the carried Sb9 effectively inhibits carrier recombination, the catalytic activity of the catalyst in photocatalysis is further improved, and the material has a good application prospect.

The invention relates to the technical field of photocatalysis, and discloses a three-way catalytic material, a preparation method and application thereof, a method for producing hydrogen through water decomposition and a method for producing hydrogen through ammonia decomposition. The invention relates to a three-way catalytic material. The three-way catalytic material comprises a carbon nitride matrix, iron oxide and cadmium sulfide, wherein the iron oxide and the cadmium sulfide grow on the carbon nitride matrix in a cluster form; the average particle size of the iron oxide and cadmium sulfide clusters is 40-80 nm. The three-way catalytic material has good catalytic activity, and the photocatalytic hydrogen production performance can be improved.

The present invention discloses a quantum dot laser with a low threshold and a preparation method thereof, which includes a quartz substrate, a silica periodic grating, a quantum dot layer, and a silica protective layer stacked in sequence. The quantum dot layer is composed of closely packed mercury selenide quantum dots with a diameter of 4.8 nm to 6.6 nm, mercury sulfide quantum dots with a diameter of 4 nm to 5.2 nm, quantum dots with a core / alloy / shell structure of mercury selenide / mercury cadmium selenide / cadmium selenide with an effective exciton diameter of 4.8 nm to 6.4 nm, or quantum dots with a core / alloy / shell structure of mercury sulfide / mercury cadmium sulfide / cadmium sulfide with an effective exciton diameter of 4 nm to 5 nm. The present invention realizes environmentally stable electron doping in quantum dots by controlling the size of the quantum dots, uses the doped quantum dots as the gain medium of the laser, and further realizes a low gain threshold, a low laser threshold, sustainable continuous laser output, and a designable output wavelength.

The application relates to a preparation method and application of chiral two-dimensional cadmium sulfide nanosheets. The application aims to solve the problem that it is difficult to construct non-layered chiral two-dimensional inorganic nanomaterials. The method comprises the following steps: placing a first open reaction container and a second open reaction container in a sealable container, adding a cadmium acetate solution into the first open reaction container, then adding a left-rotational ibuprofen / chloroform solution drop by drop, adding a sodium sulfide aqueous solution into the second open reaction container, then adding a hydrochloric acid solution drop by drop, and finally sealing and standing. The application is used for preparing a circularly polarized light detection device for detecting left-rotational / right-rotational circularly polarized light. The application is used for the preparation and application of chiral two-dimensional cadmium sulfide nanosheets.

The invention discloses a cadmium sulfide quantum dot / bismuth tungstate / cadmium tungstate composite photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. The cadmium sulfide quantum dot / bismuth tungstate / cadmium tungstate (CdSQDs / Bi2WO6 / CdWO4) composite photocatalyst which has full-spectrum photocatalytic activity and is used for degrading organic pollutants is prepared by adopting a microwave-assisted synthesis technology, and the molar ratio of cadmium sulfide quantum dots to bismuth tungstate to cadmium tungstate is 2: (2-3): (8-12). According to the cadmium sulfide quantum dot / bismuth tungstate / cadmium tungstate composite photocatalyst as well as the preparation method and application thereof, due to the introduction of the cadmium sulfide quantum dots, the light absorption range of bismuth tungstate / cadmium tungstate is widened, and the light utilization rate is increased; the cadmium sulfide quantum dots, the bismuth tungstate and the cadmium tungstate form effective heterojunctions in close contact, so that the separation efficiency of photon-generated carriers is improved, and the photocatalytic performance is effectively improved.

This invention discloses a three-armed cadmium sulfide nanorod photocatalyst, comprising: three-armed cadmium sulfide nanorods, molybdenum disulfide, and iridium disulfide; wherein each of the three tips of the three-armed cadmium sulfide nanorods is loaded with molybdenum disulfide and iridium disulfide. This photocatalyst is obtained by mixing the three-armed cadmium sulfide nanorods with iridium chloride and sodium molybdate in a solvent, followed by a hydrothermal reaction. This invention achieves efficient separation of photogenerated electron-hole pairs and improves photocatalytic performance by successfully loading molybdenum disulfide and iridium disulfide nanoflower-like co-catalysts onto the tips of the three-armed cadmium sulfide nanorods.

The application discloses a kind of silicon carbide-transition metal sulfide composite catalysts for electrochemical hydrogen evolution, it is related to electrochemical hydrogen evolution catalyst technical field, technical scheme is first, by chemical vapor deposition method on silicon substrate growth two-dimensional silicon carbide nanosheet;Subsequently, nanosheet is mixed with zinc sulfide and cadmium sulfide powder;Finally, mixture is calcined under nitrogen atmosphere, and composite catalyst is formed after cooling.This structure shows excellent electron transport speed and stability at high temperature after cooling.Through the optimized synthesis condition, the obtained catalyst shows significant electrochemical activity and stability in electrochemical hydrogen evolution, effectively improves the efficiency of hydrogen evolution, and solves the limitations of traditional catalysts in performance and stability.This new catalyst provides an efficient and economical solution for the application of water electrolysis hydrogen production technology, and is expected to play an important role in energy conversion and storage fields.

The present invention belongs to the technical field of material chemistry, and specifically relates to a nickel porphyrin-based hydrogen bond organic framework heterojunction material and its preparation method and application. The nickel porphyrin-based hydrogen bond organic framework heterojunction material adopts cadmium sulfide (CdS) as a substrate, in-situ growth of nickel porphyrin-based hydrogen bond organic framework material, and the nickel porphyrin-based hydrogen bond organic framework heterojunction material (CdS x @Ni‑pHOF). In air atmosphere, CdS x @Ni‑pHOF has excellent photocatalytic reduction ability for hexavalent uranium without the need for hole traps, exhibits good resistance to interfering ions, and demonstrates excellent uranium removal ability in the treatment of real uranium-containing radioactive wastewater.

The application belongs to the field of photocatalytic materials, and particularly relates to a silver metavanadate composite cadmium sulfide photocatalytic material, a preparation method thereof and application thereof in photocatalytic hydrogen production. The preparation method comprises the following steps: taking a sulfur source and a cadmium source, adding ethylenediamine, stirring and uniformly mixing; transferring to a hydrothermal reaction kettle for reaction; after the reaction is completed, taking the obtained suspension, centrifuging, washing and drying to obtain cadmium sulfide powder; adding water to the cadmium sulfide, adding a silver source and a vanadium source under stirring, stirring, transferring to a reaction kettle for hydrothermal reaction, then centrifuging, washing and drying to obtain the silver metavanadate composite cadmium sulfide photocatalytic material. The photocatalytic material has a relatively obvious catalytic effect in photocatalytic hydrogen production reaction. Under the irradiation of a xenon lamp and under the condition of a set reaction system, the hydrogen production rate of the photocatalyst reaches 228.8 micromoles per gram per hour, which is obviously superior to that of a pure cadmium sulfide catalyst.

The application belongs to the field of electrochemical detection, and particularly relates to a novel water-vapor coupling photoelectric self-powered electrochemical sensor for detecting enrofloxacin and a preparation method thereof. A glass substrate is used as a substrate, a copper foil tape is used as a positive electrode and a negative electrode, CdS (cadmium sulfide) and a cobalt-based metal organic framework (ZIF-67) are used as water-vapor / photovoltaic materials to construct a heterojunction for preparing a water-vapor generator to realize sustainable power generation. The CdS / ZIF-67 heterojunction is beneficial to the separation of photo-generated carriers under illumination and synergistically enhances the water evaporation effect. An enrofloxacin (ENR) aptamer is assembled to construct a water-vapor / photovoltaic self-powered electrochemical sensor. With the help of split aptamers, the ENR detection exhibits high sensitivity and high specificity, and provides a new strategy for self-powered electrochemical detection. The water-vapor / photovoltaic self-powered electrochemical sensor has a wide detection range, high sensitivity and low detection limit.

The application discloses a kind of chlorophyll sensitized modified cadmium sulfide nanomaterials rapid preparation method, belong to photochemical energy conversion, photocatalytic degradation field.The present application is to solve the technical problems of high-quality preparation of natural organic dye sensitized semiconductor composite material and how to effectively improve photochemical energy conversion efficiency.The method of the present application: one, cadmium nitrate tetrahydrate and thioacetamide are dissolved in triethylene glycol, after being stirred sufficiently, the solution is transferred to the reaction kettle with polytetrafluoroethylene lining and heated, after being cooled to room temperature, it is washed multiple times and dried in vacuum drying oven, to obtain cadmium sulfide (CdS) powder;Two, fresh spinach leaves are added to ethanol and ground, then soaked in anhydrous ethanol, to obtain chlorophyll solution by absorbing supernatant;Three, cadmium sulfide nanomaterials obtained in step one and chlorophyll solution and anhydrous ethanol obtained in step two are ground to dryness under infrared lamp irradiation, to obtain chlorophyll sensitized modified cadmium sulfide (Chl@CdS) nanomaterials.

The invention discloses a cement-based permeable nanocrystal self-repairing waterproof coating and a preparation method thereof. The cement-based permeable nanocrystal self-repairing waterproof coating comprises a cement-based matrix; infiltrating the nanocrystal particles; the cadmium sulfide quantum dots are dispersed in the coating according to the mass ratio of 1-5% and have a dual-wavelength light-operated self-repairing mechanism, ultraviolet light (320-400 nm) triggers surface layer repairing, when the ultraviolet light is received, surface layer nanocrystal particles are driven to repair cracks with the width smaller than or equal to 0.2 mm within one hour, the anti-permeability pressure of mortar with a coating after repairing is larger than or equal to 1.5 MPa, and the anti-permeability pressure of the mortar with the coating is larger than or equal to 1.5 MPa; according to the present invention, the ultraviolet light triggers the surface layer rapid crystallization (the sealing is less than or equal to 0.2 mm crack within 1 h) and the infrared light drives the deep penetration (the penetration depth is more than or equal to 1.5 mm), such that the problems that the traditional coating depends on the moisture triggering and the deep repair ability is insufficient are solved, and the active repair effect of the surface layer rapid repair and the deep reinforcement is achieved; the impermeability is broken through, and the secondary impermeability pressure at 56 days is larger than or equal to 2.0 MPa and is obviously higher than that of a conventional self-repairing coating.

The invention discloses a preparation method and application of nickel hydroxide / cadmium sulfide heterogeneity, and the preparation method comprises the following steps: S1, mixing and stirring a cadmium source, a sulfur source and ethidene diamine, carrying out hydrothermal reaction at a certain temperature for a certain time, and after the reaction is completed, filtering, washing and drying to obtain a cadmium sulfide nanosheet; s2, dispersing the cadmium sulfide nanosheets in a sodium hydroxide solution to obtain a turbid liquid A, and dissolving a nickel source in deionized water to obtain a solution B; s3, pumping the turbid liquid A and the solution B into a supergravity reactor at normal temperature for double decomposition reaction; and S4, filtering, washing and drying the reaction liquid obtained in S3 to obtain the nickel hydroxide / cadmium sulfide heterojunction photocatalyst. The nickel hydroxide / cadmium sulfide heterojunction photocatalyst prepared by the preparation method disclosed by the invention has relatively narrow forbidden bandwidth (2.46 eV) and excellent photoelectrochemical properties; and the hydrogen production efficiency of more than or equal to 33.46 mmol / g / h can be realized under a 300W xenon lamp.

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 application discloses a kind of based on cadmium sulfide-prussian blue composite photocatalytic material and its preparation method and application.The composite photocatalytic material includes prussian blue nanoparticles and cadmium sulfide loaded on substrate, wherein, prussian blue nanoparticles are loaded on the surface of substrate, and prussian blue nanoparticles and cadmium sulfide are chemically connected to form heterojunction, and the preparation of photocatalytic material includes: substrate is soaked in the mixed solution of prussian blue nanoparticles and cadmium acetate, after closed reaction, drop sodium sulfide solution, after a period of time, substrate is taken out, washed and dried to obtain the composite photocatalytic material.The uranium adsorption performance of the composite photocatalytic material is good, the structure is stable, easy to recover, raw materials are abundant, reaction conditions are mild, steps are simple, and a large amount of production can be produced by only a small amount of cost, and it has excellent application potential in seawater uranium extraction, radioactive seawater treatment, recovery of precious metals, environmental remediation, industrial wastewater treatment and other fields.

The invention belongs to the technical field of environment detection, and particularly relates to a method for detecting Cu < 2 + > in a water body based on a biosynthetic cadmium sulfide quantum dot fluorescent probe. Cadmium sulfide quantum dots biosynthesized by an extracellular polymeric substance (EPS) are used as a fluorescent probe for detecting Cu < 2 + >, specifically, EPS is generated through carbon source stress / induction of sulfur vibrio desulfurized subspecies, the cadmium sulfide quantum dots with strong fluorescence are synthesized in the EPS, then the cadmium sulfide quantum dots and a buffer solution are mixed to prepare a fluorescent probe solution, and the fluorescent probe is used for detecting Cu < 2 + >. The obtained cadmium sulfide quantum dot fluorescent probe is used for detecting Cu < 2 + > in a water body. The method for detecting Cu < 2 + > has the advantages of simplicity in operation, high sensitivity, low detection limit and good selectivity, and has good quantitative detection capability on Cu < 2 + > in actual water, and the cadmium sulfide quantum dots are simple in synthesis, relatively low in cost and environment-friendly.