79 results about "Cadmium hydroxide" patented technology

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 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 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 provides a soil cadmium passivator. The soil cadmium passivator is prepared from biological carbon, quick lime and sodium alginate; by means of the quick lime in the soil cadmium passivator, a pH value of soil can be improved, available cadmium in an ionic state is converted into a cadmium sediment in an invalid state such as cadmium hydroxide; the sodium alginate has a good chelating effect on heavy metal cadmium; the biological carbon has certain adsorbing effects on the available cadmium in the ionic state, the cadmium hydroxide and invalid cadmium such as in cadmium a complexing state; the biological carbon, the quick lime and the sodium alginate in the soil cadmium passivator can be mutually matched and cooperated at a specific mixture ratio, so that the effects of reducing the content of the cadmium in an available state in soil and the content of the cadmium in a living body grown in the soil are realized; the soil cadmium passivator also has the advantages that a PH value in the soil is improved, the functions of the soil are improved, and secondary pollution is avoided.

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 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.

A method for fast preparing soluble near infrared CdTe quantum dots covered with mercaptan in aqueous phase relates to the preparation field of quantum dot. The method comprises the following steps: (a) adding NaBH4 or KBH4 and Te powder, adding deionized water to react at the room temperature under magnetic stirring and prepare NaHTe or KHTe solution; (b) preparing cadmium salt or cadmium oxide, cadmium hydroxide and cadmium sulfhydryl compound solution; (c) adding the solution obtained in the step (b) in a three-necked bottle, protecting with argon, stirring; (d) adding fresh and oxygen-free NaHTe or KHTe solution prepared in the step (a) in the three-necked bottle of the step (c); and (e) heating and refluxing to react and obtain the near infrared CdTe quantum dots. The method of the invention has simple operations, mild conditions and low cost and toxicity. The synthetized mercaptan modified CdTe quantum dots have good water-solubility and stability; and the fluorescence quantum yield is high and the emission spectrum can be adjusted in the near infrared region.

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 preparation method of mixed crystal phase heterojunction nano-cadmium sulfide with a special morphology. The preparation method comprises the following steps: preparing a precursor cadmium hydroxide by a solvothermal method; obtaining nano-cadmium oxide by calcination; then, vulcanizing the prepared nano-cadmium oxide by a hydrothermal method to synthesize nano-cadmium sulfide of a cubic-hexagonal mixed crystal phase; and washing and drying the product to obtain the mixed crystal phase heterojunction nano-cadmium sulfide, wherein the morphology characteristics are shown as cadmium sulfide nano-particles with particle size of 20-50 nm and cadmium sulfide nano-rods with length of 60-120 nm and diameter of 10-25 nm. The obtained mixed crystal phase heterojunction nano-cadmium sulfide is used as a photocatalyst for degrading potassium dichromate solution and has excellent photocatalytic degradation performance.

The invention discloses a controllable synthetic method of two-dimensional wurtzite-form cadmium selenide nanomaterials, belonging to the technical field of synthesis of two-dimensional semiconductor light emitting materials. According to the method, cadmium hydroxide and selenium powder are selected, and octylame and octadecylamine are used as solvents for carrying out hydrothermal solvothermal reaction so as to controllably synthesize two-dimensional wurtzite-form cadmium selenide nanosheets with fluorescence-emission peaks at 450nm-460mm and 569nm-580nm. By regulating the reaction time and temperature, two two-dimensional wurtzite-form cadmium selenide nanomaterials with different thicknesses and fluorescence-emission wavelengths can be obtained. According to the method, the theoretical research basis and the practical experience summary are provided for the controllable synthesis of the two-dimensional wurtzite-form cadmium selenide nanosheets, and the nanomaterials can be used for preparing photoelectric devices.

Disclosed is a polyacetal resin composition stable to chlorine and chlorides, which is advantageous in terms of excellent thermal stability and chlorine resistance. The polyacetal resin composition consist of 100 parts by weight of polyoxymethylene or a copolymer thereof; 0.01-1.0 part by weight of an antioxidant; 0.01-1.0 part by weight of thermal stabilizer; 0.01-10.0 parts by weight of metal hydroxide selected from among magnesium hydroxide, calcium hydroxide, barium hydroxide, cadmium hydroxide, aluminum hydroxide and combinations thereof; and 0.01-5.0 parts by weight of metal oxide selected from synthetic aluminum silicate, calcium oxide, magnesium oxide, aluminum oxide and magnesium aluminate. An article prepared from such a polyacetal resin composition is also disclosed.

The invention provides a method for preparing cadmium hydroxide nanowires. The method comprises the following steps of: 1, performing ultrasonic cleaning on a pure copper sheet by using acetone; 2, putting the cleaned pure copper sheet into a container with a mixed solution of benzene and cadmium nitrate; 3, slowly adding a 0.5mol / L sodium hydroxide solution into the container; and 4, reacting atroom temperature for 48 hours, taking a precipitate out, cleaning by using distilled water and absolute ethanol in turn, and drying in air to obtain the cadmium hydroxide nanowires. The method for synthesizing the cadmium hydroxide nanowires is simple and practicable, low in cost, high in repeatability, mild in preparation conditions and favorable for large-scale industrial production, a surfactant or a template is not used, and products have uniform appearance. The cadmium hydroxide nanowires prepared by the method can greatly improve the capacity of a nickel-cadmium battery.

The invention relates to a metal recycling method with waste cadmium-nickel battery purified fume, which comprises the steps of obtaining a positive plate, a negative plate, a diaphragm, a battery shell and a lead, shearing the negative plate and the diaphragm into small fragments, cleaning the fragments with water, filtering the cleanout fluids and mixing the filtered cleanout fluids; preparing a SO2 purification fluid by adding the positive fragments into the filtered cleanout fluid, blowing in SO2 fume, adding positive fragments into the purification fluid, stopping blowing in the fume containing SO2 when the solid-to-liquid ratio in the purification fluid reaches 1:6 to 1:5, continuing adding the positive fragments into the purification fluid, stopping adding the positive fragments into the purification fluid when the concentration of SO3<2-> in the purification fluid is detected to be lower than 100mg / l and stopping stirring the purification fluid; soaking the obtained negative fragments after being cleaned in a H2SO4 solution at the temperature of 30-90 DEG C, filtering, then adding the filtrate parallelly flowed with the solution into a reactor, continuing stirring after material fluid is added, aging, filtering, drying the obtained sediment, rewashing the sediment and drying the sediment at the temperature of 110-140 DEG C to prepare cadmium hydroxide; filtering the purification fluid and preparing potassium sulfate in a crystallizing evaporator; and soaking filter residue in the H2SO4 solution, filtering, and adding obtained filtrate parallelly flowed with a KOH solution into a reactor, continuing stirring after the material fluid is added, aging, washing, filtering, drying and then obtaining nickel hydroxide powder.

The invention discloses an acidic-soil-improvement cadmium-lowering fertilizer capable of lowering cadmium content in paddy rice. The fertilizer is prepared by sufficiently and uniformly stirring the following raw materials in percentage by weight: 8-10% of fish protein solution, 10-12% of sodium humate, 2-5% of sodium sulfide, 5-8% of potassium hydroxide, 10-15% of potassium dihydrogen phosphate, 10-15% of ammonium carbonate, 20-25% of urea and 10-35% of sucrose fermentation liquid. The acidic-soil-improvement cadmium-lowering fertilizer has the buffer function, can keep the soil pH within the range of 6.5-8.0 all the time, can not salinize the soil after long-term application, and is safe to use. The cadmium-lowering fertilizer contains abundant hydroxyl ions, and is capable of releasing sulfur ions through the fish protein solution, sodium sulfide and the like and releasing carbonate ions through the ammonium carbonate. The hydroxyl ions and cadmium ions form the cadmium hydroxide precipitate (Cd(OH)2), the sulfur ions and cadmium ions form the cadmium sulfide precipitate (CdS), and the carbonate ions and cadmium ions form the cadmium carbonate precipitate (CdCO3); the cadmium lowering effect is greatly enhanced under the combined actions of the cadmium hydroxide precipitate, cadmium sulfide precipitate and cadmium carbonate precipitate.

The invention relates to a layered-structure anatase titanium-oxide hollow hexagonal nanosheet and a preparation method thereof. The titanium oxide is assembled from 2-10 nm anatase nanoparticles and forms a multilayer hollow hexagonal nanosheet structure, the diameter of the cavity is 150-400 nm, and the wall thickness of a single layer is 10-30 nm. The preparation method comprises the following steps: using a hexagonal cadmium hydroxide nanosheet as a template, dispersing the hexagonal cadmium hydroxide nanosheet in a water solution, dropwise adding ammonium fluorotitanate and boric acid water solution in a certain proportion, stirring, standing, precipitating, and carrying out centrifugal washing to obtain a single-layer hollow-structure hexagonal titanium oxide nanosheet. A multilayer-structure hollow titanium oxide nanosheet can be obtained by repeating the operations above. The preparation method has the advantages of simple reaction process and easy control. The titanium oxide has a novel structure, and has wide application prospects in the fields of photocatalysis, catalyst carriers, thermal insulation, sound insulation, electric insulation, optical hydrolysis hydrogen production, dye-sensitized solar cells and the like.

The invention provides a passivator for cadmium in neutral soil and an application method thereof. The passivator is composed of calcium oxide with a weight accounting for 0.3-2.0% of the weight of neutral soil, calcium dithionate monohydrate with a weight accounting for 0.3-2.5% of the weight of the neutral soil, and charcoal with a weight accounting for 0.3-1.34% of the weight of the neutral soil. The passivator for cadmium in neutral soil provided by the invention reacts with effective cadmium in the neutral soil by using calcium oxide and calcined gypsum (calcium dithionate monohydrate) so as to generate small-activity cadmium sediments such as cadmium hydroxide and the like, and charcoal and the like in the passivator can selectively adsorb cadmium ions with large activity in the soil so as to reduce the transportability of the cadmium ions, therefore, an effect of reducing the quantity of effective-state cadmium in the neutral soil is achieved, the restoration of contaminated soil is implemented, and a situation that the pH value of the soil before and after the soil is treated is not changed can be ensured.

The invention relates to a tin oxide hollow hexagon nanosheet with a hierarchical structure, and a preparation method of the nanosheet. The nanosheet is formed by assembling nanoparticles with the size of 2-10nm, and a multilayer hollow hexagon nanosheet structure can be formed, wherein the cavity diameter is 150-400nm, and the single-layer wall thickness is 10-30nm. The preparation method comprises the steps of: based on a hexagon cadmium hydroxide nanosheet as a template, dispersing the hexagon cadmium hydroxide nanosheet into water solution; adding tin salt into the obtained water solution, and carrying out hydro-thermal treatment at a certain temperature after mixing; washing to obtain a tin oxide nanosheet; and repeating the above-mentioned steps to obtain the hollow tin oxide nanosheet with the multilayer structure. The preparation method is simple in reaction process and easy to control. The tin oxide is novel in structure and has good application prospect in the fields such as a thin film resistor, sensitive material, an optoelectronic device, electrode material and the like.

The invention discloses a method for preparing a metal organic frame gas separating film by utilizing the pinning effect of a metal organic nano rod array on a macro-pore substrate. The method comprises the following steps: 1) under magnetic stirring, adding an ethanol amine solution into a solution of cupric nitrate, zinc nitrate or cadmium nitrate of the same volume, slowing down the stirring speed to obtain a copper hydroxide, zinc hydroxide or cadmium hydroxide nano-wire solution, and directly filtering out the nano-wire solution onto a porous aluminum oxide film to form a nano-wire layer; 2) adding the nano-wire layer into a solution with trimesic acid so as to obtain the metal organic nano rod array; and 3) adding the nano rod array as a seed crystal layer into an organic ligand mixture solution with cupric nitrate, zinc nitrate or cadmium nitrate, so as to obtain the metal organic frame composite film. According to the method, the metal organic frame composite film directly grows on the metal organic nano rod array in a secondary growth manner, the adhesion of the film to the substrate is high, and the obtained composite metal organic frame film is applied to gas separation.

The invention discloses a batch preparation method of nanometer cadmium hydroxide or nanometer cadmium oxide. The method comprises the following steps: a CdO dispersion is placed in a ball mill, and undergoes cyclic wet grinding to obtain a Cd(OH)2 nano-slurry, the Cd(OH)2 nano-slurry is settled and concentrated, vacuum freeze-drying is performed to obtain nanometer Cd(OH)2, and the nanometer Cd(OH)2 is calcined to obtain nano-CdO; or CdO and water are reacted under the action of a high-energy mechanical field in the process of crushing the raw material CdO by a wet mechanical grinding processinto nano-particles in order to form nanometer Cd(OH)2, and vacuum freeze-drying is performed to obtain nanometer Cd(OH)2 with good dispersibility. The preparation method is simple and green, and canrealize batch production.

The invention discloses an innocent treatment method of a waste solution generated after an agricultural product laboratory test. The method comprises the steps of treatments of an acetonitrile waste solution, a methylene dichloride waste solution, a strong acid waste solution, a strong base waste solution, a mercury waste solution, a cadmium and lead waste solution and a chrome waste solution; after the treatments, acetonitrile is converted into a ferricyanide complex and stored, mercury is converted into a mercuric sulfide deposit and stored, the cadmium and lead waste solution is converted into an aluminum hydroxide, lead hydroxide and cadmium hydroxide co-precipitate and stored, the chrome waste solution is converted into an iron hydroxide and chrome hydroxide co-precipitate and stored, the methylene dichloride can be recycled after being distilled, strong acid and strong base are neutralized and diluted and then discharged; in this way, the waste solution generated after the laboratory test is almost not directly discharged into water, so that the water environment is protected and the harmfulness of life caused by the waste solution is reduced.

The invention discloses an electrochemical catalyst for an oxygen evolution reaction, and a preparation method and an application thereof. The preparation method comprises the following steps: addinga cadmium salt to water, performing stirring to uniformity to obtain an aqueous cadmium salt solution, and dropwise adding an aqueous sodium hydroxide solution to the aqueous cadmium salt solution toperform a reaction in order to obtain flaky cadmium hydroxide, wherein a molar ratio of cadmium in the cadmium salt to sodium hydroxide in the aqueous sodium hydroxide solution is 1:2; and adding theobtained cadmium hydroxide and a Nafion solution to isopropanol, performing ultrasonic mixing to uniformity in order to obtain a mixed solution, coating foamed nickel with the mixed solution, and naturally air-drying the coated foamed nickel to obtain the electrochemical catalyst for the oxygen evolution reaction. The prepared electrochemical catalyst for the oxygen evolution reaction has the advantages of excellent electrocatalytic oxygen evolution performance, stable electrocatalytic oxygen evolution performance, suitableness for industrial application, and realization of the recycling of resources and energy.

The invention provides a preparation method for a cadmium hydroxide nano-array capable of adsorbing and extracting DNA. A base metal sheet is placed into a mixed solution system; the mixed solution system is composed of an alkaline solution with the volume of 15-20 ml and the pH of 11, and an organic solution with the volume of 15-20 ml, wherein the organic solution is not soluble in the alkaline solution; a cadmium salt solution with the volume of 2-3 ml and the concentration of 1 mol / L is dripped into the mixed solution system slowly; the mixed solution system is placed for 20-24 hours under a room temperature; therefore the cadmium hydroxide nano-array can be formed on the metal sheet. The preparation method is simple in technology, low in energy consumption and low in cost; the obtained product is stable in chemical property, can be recycled for use, and has wide application prospects in aspects of medical science, biology, materials science and the like.

A primer composition that includes stabilized, encapsulated red phosphorus, at least one oxidizer, at least one secondary explosive composition, at least one light metal, and at least one acid resistant binder. The stabilized, encapsulated red phosphorus may include particles of red phosphorus, a metal oxide coating, and a polymer layer. The metal oxide coating may be a coating of aluminum hydroxide, bismuth hydroxide, cadmium hydroxide, cerium hydroxide, chromium hydroxide, germanium hydroxide, magnesium hydroxide, manganese hydroxide, niobium hydroxide, silicon hydroxide, tin hydroxide, titanium hydroxide, zinc hydroxide, zirconium hydroxide, or mixtures thereof. The polymer layer may be a layer of epoxy resin, melamine resin, phenol formaldehyde resin, polyurethane resin, or mixtures thereof. A percussion cap primer that includes the primer composition, a tertiary explosive composition, and a cup is also disclosed, as are ordnance devices including the primer composition.

The invention relates to a preparation method of nanometer cadmium oxide with a special shape. The method comprises the following steps: adding a lithium hydroxide solution into a cadmium nitrate ethanol solution by dropping, ensuring that obtained mixed liquor is reacted for 10 to 12 h at 180 to 200 DEG C, and washing and drying the obtained product, so as to obtain a cadmium hydroxide precursor; and calcinating the obtained cadmium hydroxide precursor in a segmented way, so as to obtain nanometer cadmium oxide powder, wherein the nanometer cadmium oxide adopts a hexagon cadmium oxide nanodisk with a porous structure. The obtained nanometer cadmium oxide powder is high in purity and high in catalytic performance, and is applied to a catalyst for thermolysis of ammonium perchlorate. The preparation method is simple, low in cost and suitable for industrial application.