6 results about "Cadmium hydroxide" patented technology

The invention relates to the technical field of preparation of high-purity inorganic nano materials, and discloses a controllable preparation method of a high-purity cadmium telluride nanocrystal, which comprises the following steps: pre-dissolving a conjugated acid salt in a water-phase reaction system, and reacting a cadmium salt precursor with a tellurium source precursor when ammonia gas is introduced as an inorganic gaseous ligand; a pH buffer system is constructed by ammonia gas and conjugated acid salt, and transient stability is provided for the generated cadmium telluride nanocrystals within the pH range for inhibiting the cadmium hydroxide impure phase; according to the method disclosed by the invention, an in-situ pH buffer system is constructed, so that a ligand stabilization function of the ammonia gas is decoupled from an alkaline side reaction phase of the ammonia gas, agglomeration is prevented while an impure phase is inhibited, the ligand and the salt are thoroughly removed after the reaction, and the technical problem that controllability and high purity cannot be obtained at the same time in an inorganic aqueous phase method is solved.

The application belongs to the field of composite materials and relates to a novel cadmium hydroxide (Cd(OH)2) doped molybdenum oxide photoelectrocatalyst and a preparation method thereof. A cadmium hydroxide doped molybdenum oxide (MoO 3‑x ) film (Cd(OH)2@MoO 3‑x ) is prepared by using a wet chemical one-step electrochemical codeposition method. The introduction of cadmium hydroxide not only significantly improves the light absorption characteristics of the molybdenum oxide material, but also significantly improves the performance of the molybdenum oxide photoelectrocatalytic water splitting for hydrogen production. The preparation process disclosed by the application is simple, has a short time course, simple instruments and equipment, and low cost of non-noble metals, and the prepared Cd(OH)2@MoO 3‑x film has excellent photoelectrocatalytic performance and good application prospect.

The invention discloses a method for respectively recovering cobalt, zinc and cadmium from thiram slag, which comprises the following steps: (1) adding the thiram slag into an acid leaching solution, introducing air, carrying out cobalt precipitation reaction, and carrying out solid-liquid separation to obtain a zinc-cadmium solution and cobalt-rich slag; (2) introducing oxygen-enriched air into the cobalt-enriched slag, and carrying out oxidizing roasting to obtain roasted slag; (3) mixing the roasting slag with dilute acid liquor to obtain pickle liquor and cobaltosic oxide slag; (4) blending cobaltosic oxide slag and water into slurry, mixing the slurry with the gas generated in the step (2), and absorbing sulfur dioxide and sulfur trioxide in the gas to obtain a cobalt sulfate solution; (5) adding a cadmium precipitation agent into the zinc-cadmium liquid, adding sodium hydroxide, carrying out selective cadmium precipitation reaction, and carrying out solid-liquid separation to obtain cadmium precipitation slag and zinc-rich liquid; and (6) mixing the cadmium precipitation slag with sodium hydroxide to react, and carrying out solid-liquid separation to obtain cadmium hydroxide precipitation and alkaline leaching liquid. According to the method, efficient selective separation and step-by-step recovery of cobalt, zinc and cadmium in the thiram slag are achieved.

The invention relates to a preparation method of a cadmium oxide / titanium nitride / sulfur indium cadmium heterostructure nano photocatalytic material, which comprises the following steps: by taking cadmium nitrate tetrahydrate and ammonium chloride as raw materials, depositing a cadmium hydroxide nano structure on the surface of conductive glass by adopting an electrochemical deposition method, and drying and calcining the cadmium hydroxide nano structure to obtain a cadmium oxide nano structure; coating the surface of the cadmium oxide nanostructure with a titanium nitride solution by adopting a spin-coating method, and drying to obtain a cadmium oxide / titanium nitride heterostructure; a water bath method is adopted, cadmium nitrate hydrate, thioacetamide and indium nitrate serve as raw materials, sulfur-indium-cadmium nanoparticles are loaded on the surface of the cadmium oxide / titanium nitride heterostructure, and the cadmium oxide / titanium nitride / sulfur-indium-cadmium heterostructure nanometer photocatalytic material is obtained after drying. Bidirectional hot electrons and carriers are generated by utilizing the surface plasma resonance effect of titanium nitride nanoparticles, and by combining a stepped charge channel of cadmium oxide and sulfur indium cadmium, the solar energy utilization rate and the photon-generated carrier separation efficiency are improved, and the performance of producing electricity and hydrogen by decomposing water through cadmium oxide is improved.

The invention relates to the technical field of material preparation, and particularly discloses a preparation method of superfine tungsten powder and high-purity cadmium, which comprises the following steps: contacting a crude cadmium salt solution with a sodium hydroxide solution, and carrying out precipitation reaction under the condition that the pH value is greater than 13 to obtain a cadmium hydroxide precipitate and an alkaline leaching solution; dissolving the cadmium hydroxide precipitate in inorganic acid to obtain refined cadmium salt; the method comprises the following steps: mixing tungstate and refined cadmium salt in a solution to carry out precipitation reaction, and carrying out solid-liquid separation to obtain a cadmium tungstate precipitate and a filtrate which is a precipitate mother solution; the obtained cadmium tungstate precipitate is subjected to a reduction reaction under the condition that hydrogen is introduced at the temperature of 650-750 DEG C, superfine tungsten powder and cadmium steam are obtained, and the cadmium steam leaves a reduction reaction zone along with hydrogen flow; and condensing the cadmium steam in a condensing area at the temperature of below 500 DEG C to obtain high-purity metal cadmium. According to the method, cadmium tungstate is used as a precursor, the superfine tungsten powder and the high-purity cadmium are prepared at the same time through the high-temperature reduction method, and the method has the advantages of being simple in process, high in product purity, free of ammonia nitrogen pollution and the like.

The application relates to the technical field of high-purity inorganic nanomaterial preparation, and discloses a controllable preparation method of high-purity cadmium telluride nanocrystals, which comprises the following steps: pre-dissolving a conjugate acid salt in an aqueous phase reaction system, introducing ammonia as an inorganic gaseous ligand, and making a cadmium salt precursor and a tellurium source precursor react; the ammonia and the conjugate acid salt construct a pH buffer system, transiently stabilize the generated cadmium telluride nanocrystals in a pH range for inhibiting cadmium hydroxide impurities; and the ammonia and the conjugate acid salt are physically removed after the reaction. The application decouples the ligand stability function of the ammonia from the alkaline side reaction of the ammonia by constructing an in-situ pH buffer system, prevents agglomeration while inhibiting impurities, and completely removes the ligand and the salt after the reaction, so that the technical problem that controllability and high purity cannot be achieved simultaneously in the inorganic aqueous phase method is solved.