337 results about "Cadmium salt" patented technology

The invention discloses a photocatalyst for preparing hydrogen and sulphur by decomposing hydrogen sulfide and a preparation method thereof, relating to a photocatalyst and a preparation method thereof. The invention solves the problem that the existing photocatalyst ZnIn2S4-CdIn2S4 the atomic ratio of which is that Zn:Cd=7:3 has low photocatalysis activity. The photocatalyst of the invention is ZnIn2S4-CdIn2S4 doped by transition metal ions. The preparation method comprises: adding sol prepared from transition metal salt, bivalent cadmium salt, bivalent zinc salt, trivalent indium salt and thioacetamide into an autoclave; and carrying out hydrothermal synthesis and vacuum drying to obtain the photocatalyst for preparing the hydrogen and the sulphur by decomposing the hydrogen sulphide. The invention has high catalytic activity; the speed for producing the hydrogen by carrying out photocatalysis on the hydrogen sulphide is 1100-3500 mu mol / h.g which is 1.8-6 times of that obtained by utilizing the ZnIn2S4-CdIn2S4. The photocatalyst of the invention can be used for processing tail gas containing hydrogen sulphide.

An asphalt-based, cold paving / coating formulation that provides increased flexibility with respect to the choice of aggregate types, asphalt emulsion types, type and amount of the surfactants used to produce the asphalt emulsion, asphalt emulsion pH's and application temperature's than conventional cold paving / coating formulations while providing good mix times and curing behavior. The asphalt-based formulation can be formed by mixing water; an asphalt emulsion; at least one first compound in aqueous solution selected from the group consisting of alkali metal salts, alkali metal hydroxides, ammonium salts, and ammonium hydroxide; at least one second compound in aqueous solution selected from the group consisting of Group IIA salts, Group IIIA salts, Group IIIB salts, copper salts, zinc salts, cadmium salts, manganese salts, iron salts, cobalt salts, and nickel salts; and optionally aggregate. Also, a method of preparing an asphalt-based formulation using these components.

The invention relates to a complexing-agent-assisted preparation method of a cadmium sulfide multi-level-structured nano-grade material. The method is characterized in comprising the steps that: a, a chemical reaction liquid is prepared, wherein 1 part of cadmium salt by weight and 0-50 parts of organic small-molecular compound by weight are dissolved in 100 parts of water or water / ethanol mixture by weight; under a temperature of 30-80 DEG C, stirring is sufficiently carried out, such that a reaction liquid is prepared; b, the cadmium sulfide multi-level-structured nano-grade material is synthesized, wherein the reaction liquid prepared in the step a is delivered into an autoclave with a polytetrafluoroethylene liner; a sulfur source is added, and a reaction is carried out; after the reaction, the autoclave is naturally cooled to 60 DEG C; methanol with a volume of 20-30% of that of the total volume of the reaction liquid is added; a product is filtered, and is washed multiple times by using anhydrous ethanol; and the product is dried by vacuum pumping, such that the cadmium sulfide nano-grade material with different crystal forms and morphologies is obtained. The method provided by the invention has the advantages of simple process, low cost, and high operability. With the method, requirements of production and application can be satisfied by one step.

The invention discloses a preparation method of a p-CuO / n-CdS / ZnS composite semiconductor photochemical catalyst, which comprises the steps of: firstly, with an ammonium salt, a zinc salt, a cadmium salt, thiocarbamide and deionized water as raw materials, sequentially carrying out treatments such as microwave reaction, ultrasonic dispersion, heating reaction, washing, ultrasonic dispersion, filtering, drying, roasting, grinding and the like to obtain CdS / ZnS solid powder; and secondly, with the CdS / ZnS solid powder, a copper salt, alkali and deionized water as raw materials, sequentially carrying out treatments such as reaction, ultrasonic dispersion, decompression distillation, thermal treatment, washing, ultrasonic dispersion, filtering, drying, roasting, grinding and the like to obtain the p-CuO / n-CdS / ZnS composite semiconductor photochemical catalyst. Through compounding a p-type semiconductor CuO with n-type semiconductor CdS and ZnS, oxidization of holes to the CdS can be effectively reduced, the light corrosion rate of the CdS is decreased; and photoproduced electronics are effectively separated from the holes, thus the service life of the CdS is prolonged, and the photochemical catalysis efficiency of the p-CuO / n-CdS / ZnS composite semiconductor photochemical catalyst is increased. The method is simple, convenient and practical, and is beneficial to popularization.

The invention discloses a preparation method of a p-CoO / n-CdS / TiO2 composite semiconductor photocatalyst, which comprises the steps of: firstly, with ammonium salts, cadmium salts, thiourea and deionized water as raw materials, sequentially carrying out microwave reaction, ultrasonic dispersion, heating reaction ,washing, ultrasonic dispersion, filtering, drying, roasting, grinding and other treatments to obtain solid CdS powder; secondly, with the solid CdS powder, cobalt salts, ammomia water and deionized water as raw materials, sequentially carrying out reaction, ultrasonic dispersion, reduced pressure distillation, washing, ultrasonic dispersion, filtering, drying, roasting, grinding and other treatments to obtain solid p-CoO / n-CdS powder; and thirdly, with the solid p-CoO / n-CdS powder, tetrabutyl titanate, absolute alcohol, hydrochloric acid and deionized water as raw materials, sequentially carrying out reaction, ultrasonic dispersion, reduced pressure distillation, washing, ultrasonic dispersion, filtering, drying, roasting, grinding and other treatments to obtain the p-CoO / n-CdS / TiO2 composite semiconductor photocatalyst; thus, the photo-corrosion speed of the CdS is effectively decreased, and the photocatalysis efficiency of the p-CoO / n-CdS / TiO2 is increased. The preparation method has simple and convenient processes, is practical and feasible, and is beneficial to popularization.

The invention discloses a method for preparing a p-CoO / n-CdS compound semiconductor photocatalyst, which comprises the following steps: in a ratio of the weight percentage of ammonium salt to cadmium salt to thiocarbamide to deionized water of (0.001 to 90 percent): (0.001 to 70 percent): (0.001 to 90 percent): (0.001 to 90 percent), mixing the ammonium salt, cadmium salt, thiocarbamide and deionized water for reaction, filtering, washing, roasting and grinding to obtain CdS solid powder; and in a ratio of the weight percentage of CdS solid powder to cobalt salt to ammonia water to deionized water of (0.001 to 90 percent): (0.001 to 70 percent): (0.001 to 90 percent): (0.001 to 90 percent), mixing the cobalt salt, ammonia water and deionized water for reaction, adding the CdS solid powder for three times, and performing stirring, ultrasonic dispersion, distillation at reduced pressure, heat treatment, washing, filtering, roasting and grinding to obtain the p-CoO / n-CdS compound semiconductor photocatalyst by. The prepared p-CoO / n-CdS compound semiconductor photocatalyst can be applied to photocatalytic degradation of organic pollutants, photocatalytic decomposition of water for hydrogen production and manufacture of solar cells under the condition that ultraviolet light, visible light and sunlight are used as light sources respectively.

The invention relates to a method for preparing a transition metal ion-doped porous CdIn2S4 photocatalyst. The invention aims to solve the problem of low catalytic activity in the conventional CdIn2S4 photocatalyst. The method comprises the following steps of: 1, dissolving bivalent cadmium salt, trivalent indium salt and thioacetamide into water or a nonaqueous solvent, adding a template agent and performing ultrasonication until the bivalent cadmium salt, the trivalent indium salt and the thioacetamide are dissolved completely; 2, adding transition metal salt and performing ultrasonication to obtain yellow colloidal precipitate; 3, performing heat treatment, cooling to room temperature, performing centrifugation, collecting the precipitate, and washing with distilled water; and 4, performing centrifugation, collecting the precipitate, ultrasonically washing with absolute ethanol, performing suction filtration and performing vacuum drying to obtain the transition metal ion-doped porous CdIn2S4 photocatalyst. The method is simple in process and simple and convenient in operation; no other impurities are produced; the prepared transition metal ion-doped porous CdIn2S4 photocatalyst has high visible light catalytic hydrogen production activity; and the method is applied in the field of photocatalytic materials.

The invention relates to an acid single flow cell which can be applied to large-scaled energy storage and power generation. The cell comprises an electrolyte storage tank, a cadmium or indium deposited cathode current collector and a lead dioxide anode; an acid solution of soluble cadmium salt or indium salt is used as an electrolyte; and when the cell is charged, the cadmium or indium ions are deposited on the cathode current collector from the electrolyte, and when the cell is discharged, the metal cadmium or indium is dissolved in the electrolyte from the cathode current collector. The current cell has the advantages of simple structure, convenient preparation, high electric energy conversion efficiency, long cycle life, environmental protection, safe use, and the like.

The invention discloses a cathode electrode composite material, which comprises a plurality of ferriferous oxide particles and a conductive aid which is selected from copper, cobalt, nickel, tin, antimony, bismuth, indium, silver, gold, lead, cadmium, carbon black, graphite, cupric salt, cobalt salt, nickel salt, tin salt, antimonic salt, bismuth salt, indium salt, silver salt, gold salt, lead salt, cadmium salt, cupric hydroxide, cobalt hydroxide, nickel hydroxide, tin hydroxide, stibine hydroxide, bismuth hydroxide, indium hydroxide, silver hydroxide, gold hydroxide, lead hydroxide, cadmium hydroxide and a group consisting of the combinations. When applied to an electrochemical device, the cathode electrode composite material can show high charging and discharging characteristics and high electric capacity. Moreover, the invention provides a preparation method of the cathode electrode composite material and an electrochemical device applying the same.

The invention provides a preparation method of a composite photocatalyst CdS / n-TiO2 for catalyzing and decomposing H2S to prepare hydrogen and relates to a preparation method of a composite photocatalyst. The preparation method solves the problem of low hydrogen generation rate when H2S is optically catalyzed and decomposed by CdS / TiO2. The preparation method comprises the following steps: ultrasonically dispersing, drying, grinding and roasting nanometer TiO2 in a dispersing agent to obtain n-TiO2; adding the n-TiO2 in a cadmium salt solution and a vulcanizing agent solution to obtain yellow gelatinous precipitates; and obtaining the composite photocatalyst CdS / n-TiO2 by hydrothermally processing, cooling, washing and filtering the precipitates and drying filter residues. Compared with the CdS / TiO2 photocatalyst, the composite photocatalyst obtained by the preparation method increases the hydrogen generation rate by 28 percent to 52 percent under visible light.

The invention provides a process for preparing cadmium hydroxide single-crystal nanowires comprising the steps of, (1) dissolving soluble cadmium salt in deionized water, slowly charging alkali or ammonia solution till the pH is 10-14, stiring to produce white Cd(OH)2 deposition, (2) centrifugally scouring the white Al(OH)2 till pH is neutral, (3) redepersing the scoured white Cd(OH)2 deposition into deionized water, charging right amount of inorganic salt, (4) hot reaction 10-15 hours in air-tight container at 200-250 deg. C, thus obtaining cadmium hydroxide single crystal nanowires.

The invention relates to a quantum dot / polymer composite nitric oxide fluorescent probe and a preparation method thereof. The fluorescent probe is a powdered solid and is prepared from a quantum dot and methyl methacrylate (MMA) by an in-situ composite method, wherein the quantum dot and MMA polymer are combined though a covalent bond. The preparation method comprises the following steps of: 1) dispersing and dissolving water-soluble cadmium salt in a mixed solution of the MMA and a coupling agent, performing prepolymerization reaction at the temperature of between 70 and 90 DEG C under the action of an initiator under the protection of N2, and stopping reacting when the viscosity of a system is approximate to that of glycerol; 2) adding an aqueous solution of a sulfur source, a selenium source or a tellurium source into the prepolymer system in the step 1) dropwise with violent stirring under the protection of the N2 until the system is quickly discolored, wherein the molar ratio of the sulfur source, the selenium source or the tellurium source to the cadmium salt is 1.1:1-1.4:1; and 3) polymerizing at the temperature of between 50 and 70 DEG C for 10 to 24 hours. The fluorescent probe has the double advantages of the quantum dot and the polymer, is high in stability and is suitable for detecting nitric oxide in a sample to be detected.

The invention discloses a making method of liquid phase nanometer cadmium sulfide hollow ball, which is characterized by the following: adopting inorganic cadmium salt compound and monomer sulfur powder in the soluble liquid system as raw material; blending cadmium source solution and sulfur source solution directly or placing in the seal reactor to heat under certain temperature; synthesizing the product within one step; avoiding silica or small macromolecular ball or surface activator as mould; simplifying equipment and operation with cheap raw material; fitting for marking biology; possessing potential value in the nanometer material synthetic or other relative scientific domains.

The invention discloses a preparation method for a porous nano p-CuS / n-CdS compound semiconductor photochemical catalyst. According to mass percents of templates of copper salt, cadmium salt, a sulfocompound and a sublimable compound and deionized water (0.001%-75%): (0.00001%-90%): (0.001%-85%): (0.001%-75%): (0.001%-98%), and sequentially subject to processes of reaction, centrifugal separation, distilled water washing, ultrasonic dispersion, centrifugal separation, ultrasonic treatment, reduced pressure distillation, drying, roasting, natural cooling, grinding and the like, the p-CuS / n-CdScompound semiconductor photochemical catalyst is obtained. On the condition that visible light and sunlight serve as light sources, the p-CuS / n-CdS compound semiconductor photochemical catalyst can be applied to hydrogen production of photocatalytic water splitting and photocatalytic degradation of organic pollutants. The preparation method is simple and practicable in process, small in investment and beneficial for popularization and application.

The invention relates to preparation and high-efficiency hydrogen production of a novel surface plasma enhanced high-efficiency photocatalytic water splitting composite catalyst Au / CdX (X refers to S, Se and the like). The Au / Cd core-shell structure nanocrystalline consists of Au particles serving as a core and a CdX semiconductor serving as a shell layer, wherein the size of the Au particles is 20-45nm; the CdX shell layer is a single crystalline layer of 2-12nm; and the crystal form is a hexagonal phase of wurtzite. The preparation method comprises the following steps: adding a precursor into hydrosol of the Au / Ag nanoparticles to be converted into Au / AgX; adding a cadmium salt and a phosphine ligand, reacting at the temperature of 50 to 80 DEG C to generate the Au / CdX catalyst. The photocatalytic water splitting hydrogen production efficiency of the catalyst is 20-30mol / g / h and is higher than that of pure CdS quantum dots of the same mass by over 1000 times. The water solubility is high, the inverted phase is not needed during the test, the operating device is simplified, and the time is shortened. Meanwhile, the material utilization rate is improved, the synthesis condition is mild, and the catalyst is environmentally friendly, feasible and low in cost and has wide application prospects in the field of photocatalysis.

The invention provides a preparation method and an application for a CdS / BiOI heterojunction photo-catalyst. The method comprises the following steps: firstly, respectively dissolving bismuth salt material and iodine source material in glycol, mixing the two solutions and stirring for 1h; transferring a mixed solution into a reaction kettle and reacting for 8-16h at 120-200 DEG C, thereby acquiring an orange red solid; washing, drying and grinding the orange red solid, thereby acquiring dry BiOI powder; dissolving cadmium salt in deionized water, adding BiOI powder and buffer salt in turn and increasing the temperature of the reaction system from room temperature to 30-90 DEG C; adding complexing agent into the system, dropwise adding 50ml solution containing sulfur source material into the system and stirring for 15min, thereby acquiring yellow sediment; and washing, drying and grinding the yellow sediment, thereby acquiring the yellow powder, namely, the CdS / BiOI heterojunction photo-catalyst. The CdS / BiOI heterojunction photo-catalyst prepared according to the invention is used for degrading the organic pollutants in water. Compared with the photo-catalysts, such as, commercial TiO2 (P25), pure phase CdS and pure phase BiOI, the catalyst has higher visible-light catalytic activity.

The invention discloses an aqueous phase synthesis for high quality cadmium selenide quantum dots in temperature controlled microwave reactor by using water as solvent, mixing cadmium salt or cadmium oxide with water-soluble mercapto compounds, reacting sodium borohydride or potassium borohydride with selenium powder, obtaining cadmium selenide precursor solution, placing the solution in air-tight polytetrafluoroethylene tank, reacting in temperature controlled microwave reactor, thus rapidly synthesizing cadmium selenide fluorescent light quantum dots.

The invention relates to a method for preparing a SiO2 nanorod / CdS composite material. The method is characterized by adopting active SiO2 nanorods obtained from attapulgite clay through acidification treatment as a carrier, taking a cadmium salt as a cadmium source, taking Na2S as a sulfur source, taking EDTA (ethylenediaminetetraacetic acid) and the like as a template agent, and reacting under hydrothermal conditions to obtain the SiO2 nanorod / CdS composite material. The SiO2 nanorod / CdS composite nanomaterial prepared by the method disclosed by the invention can be widely applied in the fields of control of environmental pollution, preparation of photocatalytic functional materials and the like.

The method includes: 1) washing up and drying the substrate; placing the substrate against the reactor wall; 2) preparing material solution by using cadmium salt, ammonium salt, organic compounds containing sulfur and ammonia; filling the material solution into the reactor until top of substrate is submerged; 3) putting the reactor into thermostatic chamber, and keeping the water temperature from 70íµ to 95íµ, and introducing 20- 60 khz ultrasonic wave to react 10-60 min.; 4) after completing reaction, cleaning up it by using osculation of distilled water and ultrasonic wave of ammonium nitrate. The facility thereof consists of a medium solution heater, a thermostatic chamber, a booster pump located between heater and thermostatic chamber, a suspension gear located at upper portion of thermostatic chamber and hanging in the thermostatic room. At the bottom of the thermostatic chamber there is an ultrasound transducer.

The invention relates to a 2,3'5,5'-diphenyl tetracarboxylic acid cadmium complex and a preparation method thereof and relates to the field of cadmium complex fluorescent materials. A chemical formula of the 2,3'5,5'-diphenyl tetracarboxylic acid cadmium complex is {[Cd2(bptc)(bih)(H2O)2].H2O}n, wherein bptc is 2,3',5,5'-diphenyl tetra formic acid anion ligand, and bih is 1,6-di(imidazole-1-) hexane. The preparation method of the 2,3'5,5'-diphenyl tetracarboxylic acid cadmium complex comprises the following steps: under hydrothermal condition, dissolving 2,3',5,5'-diphenyl tetra formic acid, an inorganic base, 1,6-di(imidazole-1-) hexane and a cadmium salt in water, adding the obtained mixed solution into a closed reaction still, heating to 120-160 DEG C at a speed of 10 DEG C per hour, performing heat preservation for 3 days, then cooling to room temperature under natural conditions, so that colourless massive crystals are generated, and then washing and drying, so that the target product, namely the 2,3'5,5'-diphenyl tetracarboxylic acid cadmium complex, is obtained finally. The 2,3'5,5'-diphenyl tetracarboxylic acid cadmium complex has stable fluorescence property and high yield, and the preparation method is simple, and has good repeatability.

The invention discloses a prussian-blue derivative Cd2[Fe(CN)6] nanorod and a preparation method thereof. The preparation method for the Cd2[Fe(CN)6] nanorod comprises: firstly adding proper amount of potassium ferrocyanide, polyethylene glycol (PEG-400), a cadmium salt and deionized water into a hydrothermal reaction kettle core, putting into a baking oven and performing 120 DEG C-180 DEG C constant-temperature reaction, and naturally cooling to room temperature after the reaction is finished; and performing centrifugation washing and drying on the prepared product, so as to prepare the Cd2[Fe(CN)6] nanorod. After the prepared Cd2[Fe(CN)6] powder is tested by an X-ray diffractometer and a scanning electron microscope, Cd2[Fe(CN)6] is a nanorod, is uniform in particle size distribution, and can be used as a material used for making electrochromic devices and a secondary battery electrode material.

The present invention relates to a composite material for a negative electrode, including: a plurality of iron oxide particles; and a conductivity improver, which is selected form the group consisting of copper, cobalt, nickel, tin, antimony, bismuth, indium, silver, gold, lead, cadmium, carbon black, graphite, copper salt, cobalt salt, nickel salt, tin salt, antimony salt, bismuth salt, indium salt, silver salt, gold salt, lead salt, cadmium salt, copper hydroxide, cobalt hydroxide, nickel hydroxide, stannic hydroxide, antimony hydroxide, bismuth hydroxide, indium hydroxide, silver hydroxide, gold hydroxide, lead hydroxide, cadmium hydroxide and the combination thereof. In the case of applying the composite material for a negative electrode according to the present invention in an electrochemical device, the improved charge / discharge characteristics and high capacity can be achieved. In addition, the present invention further provides a method for fabricating the above-mentioned composite material for a negative electrode and an electrochemical device using the same.

The invention relates to a bis-o-vanillin ethylene diamine schiff base and transitional metal coordination compound and a preparation method thereof, which can solve the problem of the application of a coordination compound prepared by compounding bis-o-vanillin ethylene diamine schiff base serving as a ligand and a transitional metal to a medicament for treating diabetes. The coordination compound is the bis-o-vanillin ethylene diamine schiff base and transitional metal coordination compound prepared by compounding the bis-o-vanillin ethylene diamine schiff base with the transitional metal. The preparation method of the coordination compound comprises the following steps of: dissolving one of 0.02 to 0.03mol of transitional metal vanadium, 0.02 to 0.03mol of cadmium salt or 0.02 to 0.03mol of copper salt and 0.02mol of bis-o-vanillin ethylene diamine schiff base by using 3 to 5mL of methanol or mixed solution of 3 to 5mL of methanol and N,N-dimethyl formamide in the volume ratio of 1:6 respectively; slowly and uniformly mixing; filtering the mixed liquor; diluting the obtained filtrate to 8mL by using methanol; and standing at the temperature of between 18 and 25 DEG C for 5 to 30 days to obtain the coordination compound. The coordination compound has a simple preparation method, can be effectively used for preparing the medicament for treating the diabetes and is an innovation of the medicament for treating the diabetes.

The invention discloses a preparation method of a catalyst for catalytic degradation of pollutants by ultraviolet light. The preparation method comprises the step of preparation of cadmium acetate, titanate and a PVP (polyvinyl pyrrolidone) precursor, and is characterized in that a cadmium sulfide and titanium dioxide catalyst is prepared with the process of first electrostatic spinning and later hydrothermal vulcanization. Cadmium salt is uniformly mixed into fiber with an electrostatic spinning method, and cadmium oxide is vulcanized with a hydrothermal method, so that cadmium sulfide is uniformly dispersed into the fiber; the reaction condition is mild, operation is simple and convenient, and the catalyst efficiency is high. Therefore, the preparation method has certain application value in the aspect of catalytic degradation of the pollutants by the ultraviolet light.

The invention discloses a 5-aminoorotic acid dinuclear cadmium complex. The 5-aminoorotic acid dinuclear cadmium complex is characterized in that the complex is prepared from a cadmium salt, an orotic acid derivative and 2,2'-bipyridine through a hydrothermal method; the complex has a definite space structure and an accurate molecular formula; and synthesis steps are simple. The constitutional unit of the complex comprises two metallic cadmium ions, two 5-aminoorotic acids, one oxalate ions, two 2,2'-bipyridines, two coordination water molecules and four object water molecules; the molecular formula of the complex is C32H36N10O18Cd2; the complex belongs to a triclinic system; the space group of the complex is P-1; and cell parameters are that a is equal to 8.8941 angstrom, b is equal to 9.2338 angstrom, c is equal to 13.759 angstrom, alpha is equal to 97.978 DEG, beta is equal to 97.975 DEG and gamma is equal to 116.416 DEG. The prepared complex is a purple fluorescent material, has excellent physicochemical performance and shows wide application prospects in the field of photoelectric materials or catalytic materials.

The invention belongs to a non-ferrous metal metallurgy industry and particularly relates to a method for enriching and recycling cadmium from a lead smelting system. The method comprises the following steps: matching a lead concentrate with auxiliary materials and returned low-cadmium smoke and dust, and adding desulfurization smelting lea of a bottom blowing furnace; circularly enriching the cadmium in electric dust-collection smoke and dust in a form of cadmium sulfate; when the cadmium content of the electric dust-collection smoke and dust is 5%-28%, leaching by using water or dilute sulfuric acid to separate the cadmium; displacing a leaching solution by using zinc powder to produce cadmium sponge and further producing rough cadmium and fine cadmium; and taking a solution obtained by displacing the cadmium as a raw material for producing nano zinc oxide, zinc sulfate monohydrate and zinc sulfate heptahydrate to recycle zinc. The lead is enriched in leached dreg in a leaching process so that the lead can be conveniently returned back to a lead system to be smelted and recycled. According to the method, a bottom blowing smelting technology is adopted; when the lead is smelted, the cadmium in the raw material is efficiently enriched and converted into a water-soluble cadmium salt; a technological process is shortened and conditions for directly enriching, separating and recycling the lead and the cadmium are provided; the dispersion of the lead when the cadmium is recycled by a wet method is avoided and the production cost is reduced.

The invention relates to a 1,2-naphthalene diacid containing cadmium coordination complex and a preparation method thereof. The coordination complex has the following chemical formula: [CdL(bpe)(H2O)]infinity, wherein L is equal to a 1,2-naphthalene diacid carboxylic anion ligand; and bpe is equal to 1,2-bis(4-pyridyl)ethane. The synthesis method of the coordination complex is characterized by dissolving a 1,2-naphthalene diacid anhydride ligand, 1,2-bis(4-pyridyl)ethane and metal cadmium salt into water under the hydrothermal condition to prepare solution, sealing the solution into a 25mL reaction kettle, heating the solution to a certain temperature at a rate of 10 DEG C per hour, maintaining the temperature for three days and then naturally reducing the temperature to the room temperature, thus obtaining the coordination complex. The obtained crystalline material is expected to be further researched, developed and applied in the field of fluorescent materials.

The invention relates to application of a water-soluble quantum dot-mesoporous nickel graphite working electrode in detection of trace amino acid in food. The invention provides the water-soluble quantum dot-mesoporous nickel graphite working electrode with low reagent consumption, high detection speed and high sensitivity and for detecting trace amino acid in food and application of the electrode in detection of the trace amino acid in the food. The water-soluble quantum dot-mesoporous nickel graphite working electrode is prepared by adopting the following steps of: mixing semiconductor, sodium salt or potassium salt, cadmium salt or oxide of cadmium, water-soluble stabilizing agent and water uniformly to prepare water-soluble quantum dots; modifying proper chemical groups on the surfaceof mesoporous nickel; combining the mesoporous nickel and the water-soluble quantum dots; and mixing the combination of the quantum dots and the mesoporous nickel, graphite and paraffin uniformly, then putting the mixture into a glass tube, and putting the prepared water-soluble quantum dot-mesoporous nickel graphite working electrode into a refrigerator for storage. The prepared water-soluble quantum dot-mesoporous nickel graphite working electrode for detecting the trace amino acid in the food is used as a working electrode of a flow injection electrochemical luminous instrument, a proper counter electrode and a proper reference electrode are selected, buffer solution is added into a detector, and then the amino acid in a food sample is detected. The detector has higher selectivity and sensitivity and low reagent consumption, and can be reused.

The invention discloses a method for spontaneously growing Au nanometer particles on an electro-deposited CdSe film. Mixed solution of divalent cadmium salt and selenium dioxide (SeO2) is used; firstly, CdSe is deposited on the surface of an electrode by using an electro-deposition method to form a carrier film; the electrode is dipped in Au nanometer particle growth liquid for growing by 1-3 hours in a constant-temperature water bath boiler; and finally, the electrode is taken out to spontaneously grow the Au nanometer particles. The method is simple in preparation steps; and the deposited composite film is strong in adhesive force, high in efficiency, low in cost and more suitable for large-scale production.

The invention discloses a synthesis method of a large-area two-dimensional composite nano-material. Firstly, an amine precursor is subjected to heating decomposition, and C3N4 nano sheets are synthesized; then, the synthesized C3N4 nano sheets, an amine solvent, cadmium salt and sulphonium salt are mixed with water, stirring and ultrasonic treatment are performed to make the mixture fully dispersed, and the large-area two-dimensional composite nano-material is obtained through heating reaction after centrifugation. According to the synthesis method, CdS nano sheets and the C3N4 nano sheets are compounded, the special two-dimensional composite material has a large-area contact interface and is advantageous to current carrier separation, the CdS nano sheets are matched with the C3N4 nano sheets in a band gap mode, the photocatalytic activity of the composite material is improved, and the composite material has excellent photocatalytic organic-matter degradation performance and photocatalytic hydrogen generation performance and is good in repeating performance and long in cyclic service life. The raw materials are low in cost, and the synthesis method is simple and convenient to operate and high in yield and has wide industrialization prospect.