195 results about "Cadmium nitrate" patented technology

The invention discloses a deposition-hydrothermal method for preparing a nano-sized CdxZn<1-x>S photocatalyst with high visible-light photocatalytic activity. The method includes the following steps: 1) adding dropwise a mixed solution of cadmium nitrate and zinc nitrate into a sodium sulfide solution, stirring at a medium rate for 0.5-3 hours, maintaining the temperature at 10-40 DEG C to obtain a nano-sized powdery precursor precipitate; 2) placing the nano-sized powdery precursor precipitate in a reaction vessel, raising the temperate at a rate of 1-5 DEG C / min up to 150-240 DEG C, maintaining the temperature, allowing hydrothermal reactions for 12-24 hours, stopping the hydrothermal reactions, naturally cooling down to room temperature, taking out the reaction products, washing with the deionized water and the anhydrous alcohol for 3-4 times, drying at 50-80 DEG C in a vacuum drying oven to obtain a solid solution of nano-sized CdxZn<1-x>S photocatalyst. The production method is carried out in water phase with easy operation and low cost. The product has uniform distribution of particle size, the forbidden band width and optical properties thereof are controlled by changing components, and the product has high visible-light photocatalytic activity and good prospects in industrial application.

The invention discloses a method for preparing a cadmium sulfide graphite-like carbon nitride compound photocatalyst. The photocatalyst is applied to the field of carbon dioxide reduction achieved through photocatalysis. Urea is placed in a quartz crucible drying box to be dried, and then a crucible is moved to a muffle furnace to be forged; after forging ends, the crucible is naturally cooled, and a g-C3N4 catalyst is obtained; the g-C3N4 catalyst is taken and placed in a round-bottom flask containing deionized water to be stirred to obtain suspension, and then a cadmium nitrate solution and a thioacetamide solution with the molar ratio being 1:1.5 are weighed and have a constant-temperature reaction in the suspension; after the reaction, the product is cooled to room temperature, centrifuged and washed with alcohol and deionized water for many times, the product is dried, ground and put into a bag, and the CdS / g-C3N4 compound photocatalyst is obtained. Raw materials used in the method are cheap and easy to obtain, operation is easy and convenient, activity evaluation is conducted on the prepared photocatalyst, results show that the photocatalyst can effectively reduce CO2, and the activity of the photocatalyst is greatly improved compared with a pure CdS catalyst and a pure g-C3N4 catalyst.

The invention discloses a method of rapidly preparing a metal organic framework material thin-film from hydroxide nanowires and organic ligands under a normal temperature. The method comprises (1) adding an ethanolamine aqueous solution into cupric nitrate, zinc nitrate or cadmium nitrate aqueous solution of a same volume under magnetic stirring, slowing down a stirring speed to obtain corresponding copper hydroxide, zinc hydroxide or cadmium hydroxide nanowire solution, and directly filtering the nanowire solution through a porous alumina film to form a nanowire layer; (2) adding the nanowire layer into an organic ligand solution with ethanol, octanol or N,N-dimethyl formamide as a solvent, and reacting for 30 minutes under the normal temperature to obtain the metal organic framework material thin-film. The method provided by the invention can directly prepare large-area compact thin-film on a porous substrate under the normal temperature, and the method is simple in operation steps, low in cost, and environmental-protective. Reaction residues can be easily recovered. The prepared thin-film can stably exist. The method expands an application range of the metal organic framework material thin-film.

The invention relates to a preparation method for a CdS quantum dot sensitization Zn1-xCdxs sosoloid photochemical catalyst (x is less than or equal to 0.02) having the visible light photocatalytic decomposition aquatic hydrogen activity. In a cation exchange hydrothermal method, ZnS nanoparticles and a cadmium nitrate solution are used as a precursor, and the preparation is carried out by controlling the proportioning of reactants, the reaction temperature, the reaction time, and the like. The preparation method comprises the following steps of: ultrasonically dispersing the ZnS nanoparticle precursor in deionized water; adding the cadmium nitrate solution until the atomicpercent of cadmium to zinc in the system is larger than 0 to 80%; stirring for 30 minutes at room temperature and then removing into a hydrothermal kettle of 100ml; carrying out a hydrothermal reaction for 5 to 24 hours at the temperature of 100 to 200 DEG C; successively washing the collected solid sediments with water and ethanol; and drying for 10 hours at the temperature of 60 DEG C to prepare the CdS quantum dot sensitization Zn1-xCdxs sosoloid visual light photocatalyst (x is less than or equal to 0.02). The invention can ensure that the CdS quantum dot sensitization Zn1-xCdxs sosoloid visual light photocatalyst (x is less than or equal to 0.02) has the advantages of high hydrogen generation rate and no noble metal load requirement; and the method has the advantages of simple operation, no high temperature processing requirement, friendly environment and low cost.

The invention discloses a fluorescence probe for recognizing iron ions in a water body and a preparation method and an application thereof. The preparation method of the invention includes the following steps of: 1) dispersing TPT, OH-H<2>BDC and cadmium nitrate tetrahydrate in a mixed solvent composed of DMA and water to prepare a precursor solution; 2) preparing a Cd-MOF material by subjecting the precursor solution to a solvothermal reaction; and 3) adding the Cd-MOF material to a Eu<3+> solution, and obtaining the fluorescence probe with Eu<2+> load through stirring, suction filtration anddrying, wherein Eu<3+> is "in-situ reduced" into Eu<2+> ions with specific blue emission during a functional "post-modification" process. The preparation method of the invention is simple, and the production rate is high; and a test sample of the fluorescence probe does not need pretreatment or the pretreatment is simple, the recognition on Fe<3+> ions is sensitive, the fluorescence quenching rate can reach 99%, and the fluorescence probe can be used for recognizing and detecting the Fe<3+> ions in the water body.

The invention discloses a preparation method for a cadmium sulfide / graphene composite material. The preparation method comprises the steps of (1) adding cadmium sulfide and thiourea into deionized water, and stirring to obtain a clarified solution A; (2) adding oxidized graphene into the solution A, performing ultrasonic dispersion until the oxidized graphene is uniformly dispersed, heating to evaporate the mixture until the mixture is colloid, continuing to heat and combust the mixture to discharge a large amount of gas, wherein the obtained product is the cadmium sulfide / graphene composite material. According to the preparation method disclosed by the invention, the required temperature is low, the process is simple, the operation is easy, the yield is high, and preparation method can be used for large-batch production. The composite material prepared by the method has excellent photocatalysis performance.

The invention relates to preparation of a chemiluminiscence light-induced electrochemical sensor and organic phosphorus pesticide detection. Preparation is achieved through the steps that gold nanoparticles are electrochemically deposited on conductive glass; zinc oxide nanorods are prepared on the gold nanoparticles deposited on the conductive glass through a seed growing mode; CdS electrochemical deposition is conducted in an electro-deposition solution prepared from cadmium nitrate, thiourea, dimethylsulfoxide and water to obtain CdS quantum dots loaded on the ZnO nanorod surfaces; a molecularly-imprinted polymer film loaded on the surface of an electrode is prepared by taking an organic phosphorus pesticide as a template molecule, taking methacrylic acid as a functional monomer, taking dimethylacrylicacid glycol ester as a cross-linking agent, taking acetonitrile as a pore-forming agent and taking azodiisobutyronitrile as an initiating agent; a chemiluminescent reagent N-(4-ammonia butyl)-N-ethylisoluminol is covalently connected to the molecularly-imprinted film; the template molecule in the molecularly-imprinted polymer is eluted with methanol and glacial acetic acid, and then the chemiluminiscence light-induced electrochemical sensor is prepared. Chemiluminiscence generated by hydrogen peroxide and N-(4-ammonia butyl)-N-ethylisoluminol is taken as a light source, ZnO and CdS are excited by light to generate light currents, and the sensor can be applied to organic phosphorus pesticide detection.

The invention discloses a chiral coordination polymer containing a trinuclear cadmium cluster as well as a preparation method and application of the chiral coordination polymer, relates to a chiral coordination polymer as well as a preparation method and application of the chiral coordination polymer and aims at solving the problems that the existing fluorescent thermochromic material is low in product development quantity and high in adopted raw material cost and the prepared fluorescent thermochromic material is poor in monochromaticity and short in fluorescent lifetime. The polymer has the molecular formula as follows:{[Cd3(C15H7O7)2(C10H8N2)2].H2O}n. The preparation method comprises the steps of adding a 3-(2',3'-dicarboxylphenoxyl)benzoic acid ligand, a 2,2'-bipyridine ligand and cadmium nitrate into a solvent; regulating the pH value; and carrying out hydrothermal reaction to obtain the chiral coordination polymer containing the trinuclear cadmium cluster. The chiral coordination polymer containing the trinuclear cadmium cluster are used as the fluorescent thermochromic material to be applied to temperature sensors and temperature-sensitive materials. The preparation method of the chiral coordination polymer containing the trinuclear cadmium cluster can be obtained.

The invention discloses a preparation method and application of a metal organic framework thin film on the surface of a macroporous high polymer hollow fiber pipe. The method comprises the following steps of (1) adding an aqueous solution of ethanolamine into an aqueous solution of copper nitrate, zinc nitrate or cadmium nitrate with the same volume while magnetic stirring, reducing stirring speed, obtaining a corresponding solution of copper hydroxide, zinc hydroxide or cadmium hydroxide nanowires, impregnating a macroporous high polymer hollow fiber film of which one end is sealed and the other end is connected with a suction filtration pump into the solution containing the nanowires, and performing suction filtration for 30 minutes to form a nanowire layer on the surface of the macroporous high polymer hollow fiber film; (2) impregnating the macroporous high polymer hollow fiber film with the nanowire layer on the surface into an organic ligand solution, and performing reaction for 30 minutes at normal temperature. According to the method and the application, a dense organic framework thin film can be directly prepared on the surface of the macroporous high polymer hollow fiber pipe, and can be used for gas separation, the method comprises simple operating steps, and is environment-friendly, and reaction residuals can be easily recovered.

The invention discloses an analysis method of heavy metals in textiles. The method comprises the following steps: firstly, uniformly mixing cadmium nitrate, nickel nitrate, lead nitrate and lithium borate, and grinding to prepare a plurality of standard reserve substances in different mass concentrations; secondly, mixing the standard reverse substances with standard polyester-accompanied fragments to prepare a plurality of standard products in different mass concentrations; thirdly, measuring the fluorescence intensity of each element in the standard products, drawing a scatter diagram by taking the concentration as an X axis and the fluorescence intensity of the element as a Y axis to obtain a standard curve of each element and calculating a linear regression equation of each standard curve; and finally, measuring the X ray fluorescence intensities of cadmium, nickel and lead in a textile sample to be detected, checking the corresponding concentrations on the standard curve, or calculating the concentrations of the cadmium, the nickel and the lead in the sample to be detected according to the linear regression equations. The analysis method disclosed by the invention can be used for directly testing an original sample without damaging the sample and high in detection speed; the dosages of strong acid and a strong oxidant for digestion are reduced, and the damages to environments and testers are reduced.

The invention relates to a ZnO / ZnS / CdS composite of a porous core-shell structure and a preparation method thereof. The composite is prepared in the manner that porous ZnO microspheres are treated with an ion exchange method to obtain a ZnS shell and a CdS shell in sequence. The preparation method of the composite includes the steps that 1, zinc acetate is added into polyhydric alcohol to obtain a solution I, and then the solution I is put into a reaction kettle for a constant-temperature crystallization reaction to obtain the porous ZnO microspheres; 2, the porous ZnO microspheres and thioacetamide are added into water to obtain suspension II, and then the suspension II is put into the reaction kettle for an ion exchange reaction to obtain ZnO / ZnS microspheres; 3, the ZnO / ZnS microspheres and cadmium nitrate are added into water together to obtain mixed suspension III, and then the suspension III is put into the reaction kettle for an ion exchange reaction to obtain the ZnO / ZnS / CdS composite of the porous core-shell structure.

During the preparation of nano cadmium sulfide / polystyrene core-shell microsphere, polystyrene microsphere is first prepared through emulsion polymerization, which includes mixing decompress distilled styrene, lauryl sodium sufate, potassium persulfate and twice deionized water in certain proportion, leading in nitrogen while fast raising the temperature to 80 deg.c for reaction, demulsification with sodium chloride solution, filtering, washing and drying; the polystyrene microsphere is then mixed with sulfur source and cadmium source in some solvent and the mixture is heated to prepare the nano cadmium sulfide / polystyrene core-shell microsphere. The cadmium source is cadmium chloride with crystal water, cadmium caetate with crystal water, cadmium sulfate or cadmium nitrate; the sulfur source is thiacetamide, sulfourea, carbon disulfide or ammonium sulfide; and the solvent is ethanol, water or ammonia water. The microsphere is homogeneous in size and has compact shell.

Belonging to the field of preparation of inorganic nano-composite materials and environmental treatment, the invention specifically discloses a preparation method of a CdIn2S4 nanodot hybrid TiO2 hollow sphere composite photocatalyst. The method adopts TiO2 hollow spheres, cadmium nitrate tetrahydrate, indium nitrate hydrate and L-cysteine as the raw materials, and employs hydrothermal process toprepare the CdIn2S4 nanodot hybrid TiO2 hollow sphere composite photocatalyst of different ratios. The CdIn2S4 nanodot hybrid TiO2 hollow sphere prepared by the method can be applied to degradation ofthe dye methyl orange in visible light. The preparation method has the advantages of environment-friendly raw materials, simple method, mild hybridization reaction conditions, short period, low costand the like. The CdIn2S4 nanodot hybrid TiO2 hollow sphere is a novel composite visible light catalyst, and the invention reports synthesis of the composite photocatalyst for the first time. The CdIn2S4 nanodot hybrid TiO2 hollow sphere shows excellent photocatalytic degradation activity, and has important application prospects in treatment of dye wastewater.

A process for preparing hollow cadmium sulfide nano-balls includes such steps as dissolving polyethandiol in deionized water, respectively dissolving cadmium nitrate and sodium sulfide in it to obtain two solutions, mixing them in ultrasonic condition, reaction, washing, depositing and drying.

The invention relates to a material for detecting indoor organic gas and a method for preparing a gas-sensitive element using the same. The material comprises the following components by weight percent: 3-8 percent of silver nitrate, 4-11 percent of cadmium nitrate and the balance of SnO2 base material. The gas-sensitive element which is prepared by the sensitive material and is used for detecting indoor organic gas can detect residual micro organic gas after indoor decoration, has a better sensitive signal, can greatly reduce the detection limiting concentration of the organic gas, has small volume and is beneficial to micromation.

The invention relates to a method for simply preparing a hexagonal CdO / CdS heterojunction nano composite material. The method mainly comprises the following steps: preparing cadmium hydroxide, used as a precursor, from cadmium nitrate and lithium hydroxide through a solvothermal method, and performing roasting, thus obtaining nano cadmium oxide; then adding the prepared nano cadmium oxide into sodium sulfide for sulfidizing through a hydrothermal method, and performing roasting treatment, thus obtaining the CdO / CdS heterojunction nano composite material. The product has a morphology feature of hexagon consisting of nano particles. The obtained CdO / CdS heterojunction nano composite material is used for photocatalytically degrading methylene blue used as an organic dye and is relatively high in photocatalysis performance.

The invention relates to a method for preparing a zinc tungstate-cadmium sulfide heterojunction photocatalyst. The method comprises the following steps: preparing a cadmium nitrate solution; dispersing preformed zinc tungstate nanorods into the cadmium nitrate solution; slowly adding a sodium sulfide solution dropwise; filtering, washing and drying to obtain CdS-ZnWO4 heterojunctions. The method is simple, low in cost and capable of conducting synthesis in a large scale; the prepared CdS-ZnWO4 heterojunction nanorods are about 0.5-1.5 micro meters in length and 10-30 nano meters in diameter, and can be used as a photocatalyst for photocatalytically splitting water into hydrogen, and the good hydrogen production effect can be achieved without adopting a co-catalyst.

The invention discloses preparation of a light-emitting crystal material {[Cd2(tpphz)(bdc)([mu]2-OAc)2].tpphz.2H2O}n for rapid and high-sensitivity detection of permanganate ions. The preparation method comprises: adding tetrapyrido[3,2-a:2',3'-c:3'',2''-h:2''',3'''-j]phenazine, cadmium nitrate and terephthalic acid into water,stirring in N,N-dimethylacetamideto obtain a stable suspension, puttingthe suspension into a closed reaction kettle, carrying out a heating reaction, slowly cooling to a room temperature, filtering, washing, and drying to obtain the light-emitting crystal material. According to the invention, with the preparation method, the light-emitting crystal material {[Cd2(tpphz)(bdc)([mu]2-OAc)2].tpphz.2H2O}n for rapid and high-sensitivity detection of permanganate ions is obtained.

The invention belongs to the field of preparation and application of photocatalysts, and relates to a visible-light-driven NiSe2-based heterojunction photocatalyst for producing hydrogen through efficient photocatalytic water splitting. The NiSe2 / CdS heterojunction photocatalyst is synthesized through a second-step solvothermal method by firstly preparing CdS nano rods by taking cadmium nitrate and thiourea as a cadmium source and a sulfur source respectively and adopting a solvothermal method, then performing a hydrothermal reaction by taking nickel nitrate hexahydrate, hexamethylenetetramine, trisodium citrate and the synthesized CdS nano rods as substrates and taking deionized water as a solvent, then cooling, then adding an NaHSe solution, and then continuing to raise the temperature for reacting. The heterojunction photocatalyst involved in the invention has high hydrogen production rate in visible light; a preparation method is environmentally friendly; the operation is simple; the activity is stable; the utilization rate of the photocatalyst to sunlight, especially the visible light, is greatly improved; higher economic benefit can be obtained.

The invention provides a preparation method of cadmium molybdate octahedrons with controllable grain size. The method comprises the following steps: adopting quaternary microemulsion composed of nonionic surfactant alkyl polyethenoxy (10) ether (OP-10), cyclohexane, n-octanol and water, using sodium molybdate and cadmium nitrate as reactants, mixing the components of inverse microemulsion, violently stirring with a magnetic stirrer to obtain uniform and transparent inverse microemulsion with stable property, then dropwise adding the microemulsion with cadmium nitrate in the microemulsion withsodium molybdate to react, ageing, centrifugalizing and washing the product with acetone, absolute ethanol and secondary water repeatedly to obtain the cadmium molybdate octahedrons having uniform shape, size and height. The invention adopts the technical scheme that the template action of the inverse micell microemulsion is used to prepare barium molybdate octahedrons so as to solve the problem that the grain size of the product is hard to control by using the existing preparation method of cadmium molybdate octahedrons. The method of the invention is characterized by simple production technology, safe production process and difficult agglomeration of the product and can be widely used in the preparation of inorganic functional materials.

A Cd metal-organic framework material and a preparation method and application thereof belong to the technical field of crystalline materials. chemical formula is CdL0.5dpe0.5.2H2O, wherein L is an organic ligand 4,8-disulfonyle-2,6-naphthalenedicarboxylic acid; and dpe is an auxiliary organic ligand 1,2-di(4-pyridyl)ethene(1,2-di(4-pyridyl)ethylene). Under a closed condition, the organic ligand L (4,8-disulfonyle-2,6-naphthalenedicarboxylic acid), the auxiliary organic ligand dpe (1,2-di(4-pyridyl)ethene(1,2-di(4-pyridyl)ethylene)) and cadmium nitrate in a mixed solution of DMA (N,N-dimethylacetamide) and H2O undergo a thermal reaction to obtain crystal of the metal-organic framework material. The metal-organic framework material has strong fluorescence and can be used as a selective detection material of a nitro-explosive 2,4,6-trinitrophenol (TNP).

The various embodiments herein provide a method of preparation of a nano-material for dechlorination of polychlorobiphenyls (PCB) from oil. The method involves preparing a modified bentonite prepared by treating with hexadecyl pyridinium bromide surfactant and dispersing the modified bentonite in cyclohexane. Aqueous solutions of metal ion such as Cadmium Nitrate or Zinc Nitrate and sulfide ions such as sodium sulfide are added alternately to obtain metal sulphide nano-particles. zinc nitrate is more preferable. The method of dechlorination of polychlorobiphenyls from oil involves irradiating a mixture of oil, nano-material and a solvent such as toluene under UV light for 2-6 h. A nano-material including a modified bentonite with a mono-layer of surfactant and metal sulphide nano-particles such as ZnS and CdS for remediation of oil containing PCB, is also provided.

The invention discloses a color-changing organic-inorganic hybrid material, and a preparation method and an application of the material. A chemical formula of the material is [Cd3(CPBPY)2(BDC)3], wherein CPBPY is 3-benzoic acid-4,4'-dipyridyl; and BDC is p-benzene dicarbonic acid. The preparation method of the material comprises the steps of dissolving cadmium nitrate, terephthalic acid and monochlorated-3-benzoxy-4,4'-dipyridyl in a mixed solvent prepared from ethanol, water and N,N'-dimethylformamide proportionally under a solvothermal condition, heating for 5-10 days at 100 DEG C, cooling at a speed of 5-10 DEG C / h, performing filtration and washing to form a yellow blocky crystal, putting the crystal in a Shrek tube, performing vacuumizing till an oxygen content not exceeding 0.06ppm,irradiating a sample with a high-pressure mercury lamp, and obtaining a target product when the sample in the tube is changed to light blue from yellow. The crystal is stable in structure under a vacuum condition; the synthesis is simple; conditions are mild; the operation is convenient; low-concentration oxygen is detected quickly under a room temperature condition; the sensitivity is high; the testing cost is low; and the material has good application prospects in an aspect of oxygen molecule detection.

The invention belongs to the field of preparation of inorganic nano composite materials and environment governance, and particularly discloses a preparation method of binary 2D / 2D CdIn2S4 / BiOCl nano composite photocatalyst with visible light activity. The preparation method adopts BiOCl nanosheets as a precursor and uses cadmium nitrate tetrahydrate, indium nitrate hydrate and thioacetamide as rawmaterials to prepare the BiOCl nanosheet-loaded CdIn2S4 nanosheet composite photocatalyst of different ratios by adopting a single one-step hydrothermal method. The 2D / 2D CdIn2S4 / BiOCl nano compositephotocatalyst with a unique structure can be used for degrading the dye methyl orange under the visible light, and has the advantages that the preparation raw material is environment-friendly, the method is simple, the hybridization reaction condition is mild, the period is short, the cost is low and the like. The CdIn2S4 / BiOCl nano photocatalyst is a novel composite visible photocatalyst; and due to the unique surface-surface heterogeneous structure, the photocatalytic degradation activity is excellent, and the application prospect in the aspect of treating the dye waste water is important.

The invention relates to a preparation method and application of an amido equipped composite hydrogel loaded with a nano-cadmium sulfide photocatalyst. The method includes: firstly mixing 2-hydroxyethyl acrylate, N-hydroxymethyl acrylamide and distilled water evenly, and taking the polymer hydrogel as the template to conduct in situ precipitation loading of a nano-cadmium sulfide photocatalyst; synthesis of the nano composite hydrogel employs hydrogel to adsorb a cadmium salt solution so as to conduct in situ precipitation; the synthesized hydrogel is utilized to adsorb cadmium ions, and then the cadmium ions adsorbed to the hydrogel are precipitated by a Na2S solution to form the nano-cadmium sulfide photocatalyst. The cadmium salt is any one of cadmium nitrate and cadmium chloride. The prepared amido equipped composite hydrogel loaded with the nano-cadmium sulfide photocatalyst can be applied to absorption and degradation of organic matter bisphenol A in water, can effectively remove the organic matter bisphenol A, and the nano composite hydrogel has high mechanical strength and long service life.

The invention discloses a preparation method of a rod-shaped self-assembled spherical zinc-cadmium-sulfur solid solution material. The preparation method comprises the following steps: measuring H2O with a measuring cylinder, adding 10mL of EN (ethylene diamine) to prepare a mixed solution, and performing magnetic stirring and ultrasonic treatment to form a mixed solution A; adding zinc acetate dihydrate and cadmium nitrate tetrahydrate which are taken as raw materials into the mixed solution A, and performing magnetic stirring and ultrasonic treatment to form a mixed solution B; adding L-cysteine which is taken as a sulfur source into the mixed solution B, and performing magnetic stirring and ultrasonic treatment to form a mixed solution C; adding the mixed solution C into an inner liningmade of polytetrafluoroethylene, and performing microwave hydrothermal reaction; and after the reaction is completed, performing centrifugal washing respectively with deionized water and ethanol forseveral times, and then performing drying and grinding to obtain zinc-cadmium-sulfur solid solution material powder.

The invention relates to a preparation method for ZnO / CdS / Cu2ZnSnS4 pn junction nanorod arrays. The preparation method for the ZnO / CdS / Cu2ZnSnS4 pn junction nanorod arrays comprises (1) soaking a glass substrate in an ethanol solution of Zn (CH3COO) 2 2H2O, and acquiring a substrate of a ZnO seed layer; (2) transferring a solution of Zn (NO3) 2 6H2O and a solution of Hexamethylene Tetramine (HTMA) into a reaction still in which a seed layer substrate is placed, reacting the solution of the Zn (NO3) 2 6H2O and the solution of the HTMA, and acquiring ZnO nanorod arrays; (3) soaking the ZnO nanorod arrays into an ethanol solution of cadmium nitrate, washing the ZnO nanorod arrays, then soaking the the ZnO nanorod arrays into a methanol solution of sodium sulphide, and acquiring ZnO / CdS core / sheath nanorod arrays; (4) soaking the ZnO / CdS core / sheath nanorod arrays into anhydrous dimethyl sulfoxide solutions of Cu (CH3COO) 2 H2O, ZnCl2, SnCl2 2H2O and thiourea, and then acquiring ZnO / CdS / Cu2ZnSnS4 pn junction nanorod arrays. The preparation method for the ZnO / CdS / Cu2ZnSnS4 pn junction nanorod arrays is simple in preparation technology, adopts a solution method which facilitates mass production under ordinary pressure, and is good in repeatability.

The invention discloses a two-step method for preparing a Zn0.2Cd0.8S / rGO composite material. The method includes the steps: adding ethylenediamine into deionized water to prepare solution A; adding zinc acetate dihydrate and cadmium nitrate tetrahydrate into the solution A to form solution B; adding L-cysteine into the solution B to form solution C; adding the solution C into a lining of polytetrafluoroethylene to perform hydrothermal reaction; centrifugally and repeatedly washing a reactant by deionized water and ethyl alcohol after reaction is completed, and drying and grinding the washed reactant to obtain Zn0.2Cd0.8S powder; adding rGO into deionized water to prepare solution D; taking and adding the Zn0.2Cd0.8S powder into the solution D to form solution E; performing hydrothermal reaction on the solution E, centrifugally washing a reactant by deionized water and ethyl alcohol, and drying and grinding the washed reactant to obtain Zn0.2Cd0.8S / rGO material powder. The method is simple in preparation process and low in cost, light-generated electrons of Zn0.2Cd0.8S solid solution materials enter graphene by the aid of energy band structures of the graphene, the electrons and holes are limited in different phases, and light-generated electron-hole composition is restrained.

A method for preparing cadmium tantalate nanoparticle photocatalysts is provided. The method includes the following steps: dissolving tantalum pentachloride and cadmium nitrate tetrahydrate in anhydrous alcohol and then dissolving polyethylene glycol in anhydrous alcohol; mixing the solutions under magnetic stirring, and evaporating solvents in a water bath to obtain a transparent sol; placing the transparent sol in an oven, fan-drying to obtain a dry sol, and grinding to obtain a flavescent precursor powder; calcining the precursor powder in a muffle furnace to obtain a gray powder; calcining the gray powder in the muffle furnace; and naturally cooling down to room temperature to obtain white cadmium tantalate nanoparticle photocatalyst. The invention utilizes the cadmium element instead of alkali metal and alkaline earth metal elements. The energy band structure and state density calculation show that the valence band of the photocatalyst is mainly formed by 02p orbital, the conduction band thereof is formed by Ta 5d, 02p and Cd 5s5p hybrid orbits, the band gap is minimized, Ta and Cd orbits are used together as reaction points to enhance the photocatalytic activity.

The invention discloses a high-nuclear manganese cluster compound based on a sulfur-containing triazole ligand and a preparation method thereof. According to the molecular structural graph, the high-nuclear manganese cluster compound is the 3-thioketone-5-mercapto methyl-1,2,4-triazole 24-nuclear manganese cluster compound. In the preparation process, by the adoption of the method of adding the second kind of metal salt cadmium nitrate, the solubleness of the indissolvable sulfur-containing triazole cluster compound is improved; the manganese cluster compound has the potential application value in the aspects of modern medicine, optics, magnetics, and ion selective absorption and separation. The method has the wide application prospect in the aspect of preparation of indissolvable cluster compound monocrystals.