131 results about "Cobalt ions" patented technology

The invention belongs to the technical field of catalytic materials and hydrocarbon reforming, and particularly relates to a high-entropy catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a metal salt solution containing lanthanum, chromium, copper, zinc, manganese, nickel, iron and cobalt ions with a chelating agent and a dispersing agent for reaction, carrying out ultrasonic cavitation treatment to obtain sol, adjusting the pH value, gelatinizing under an oil bath heating condition to obtain a colloidal precursor, drying, and calcining in an air atmosphere to obtain a perovskite type high-entropy oxide precursor; and then treating in a reducing atmosphere to obtain the FeZnCuNiCo perovskite type high-entropy alloy catalyst which contains metal components of La, Cr, Ni, Mn, Fe, Zn, Cu and Co and takes a multi-metal alloy active center of Fe-Zn-Cu-Ni-Co as a main component. The high-entropy catalyst can meet the harsh requirements of high temperature, strong carbon deposition driving force and long-period operation in a propane dry reforming reaction, and is suitable for industrial application scenarios of continuous production of high-temperature synthesis gas.

The application discloses a preparation method of graphene aerogel and application thereof, and the graphene aerogel is prepared from a three-dimensional network of graphene oxide as a continuous matrix, hydrophilic polyimide fibers as a reinforcing framework, and metal-organic coordination bonds as functional nodes by coordinating cobalt ions with ethylenediamine tetramethylene phosphonic acid, and is prepared through a hydrothermal reaction, freeze drying and high-temperature annealing; the preparation method is simple, the process is easy to control, the electromagnetic shielding performance of the prepared graphene aerogel reaches 48 dB, and the graphene aerogel has good mechanical stability in the range of-75 to 150 DEG C; under a pressure of 1 kg, the compression time and recovery time of the graphene aerogel are 30 ms and 27 ms respectively, and the graphene aerogel meets the commercial standards of sensing materials and shielding materials.

The invention belongs to the technical field of electrocatalytic materials, and discloses a CeO2 / NiCo2O4 heterojunction oxygen evolution reaction electrocatalyst and a preparation method thereof. According to the electrocatalyst, a composite protection layer composed of nitrogen-doped carbon quantum dots and CeO2 is constructed on the surface of a NiCo2O4 nanosheet array, cobalt ions are captured and dissolved out through pyridine nitrogen, reintegration is promoted through CeO2 oxygen vacancy, and interface dynamic self-repairing is achieved. And the nitrogen-doped carbon quantum dots are embedded into the CeO2 layer and are in direct contact with NiCo2O4 to synergistically inhibit cobalt loss and maintain structural integrity. By constructing the CeO2 / nitrogen-doped carbon quantum dot composite interface layer with dynamic ion capture and self-repairing capabilities, the problems of structure instability and performance degradation caused by cobalt ion dissolution of the NiCo2O4-based oxygen evolution reaction electrocatalyst under the working condition of strong oxidizing property are successfully solved; the method has important application value and industrialization prospect in the technical field of green hydrogen energy electrolyzed water.

The invention belongs to the technical field of drug-loaded release, and particularly relates to a Co-MOFs modified carboxymethylated filter paper composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: performing carboxymethylation treatment on filter paper to obtain carboxymethylated filter paper; soaking the carboxymethylated filter paper in a cobalt ion solution; and then adding an organic ligand solution to obtain the Co-MOFs modified carboxymethylated filter paper composite material. The preparation method has the advantages of mild reaction conditions and simplicity in operation; the Co-MOFs modified drug-loaded paper has good antibacterial performance and drug slow release performance, can be used as a medical dressing for promoting wound healing, and has important application value.

The invention relates to the technical field of nano-materials, and discloses a heterogeneous diatomic nano-enzyme as well as a preparation method and application thereof. The invention provides a space confinement regulation and control strategy which is used for constructing a heterodiatomic catalytic center on a nitrogen-doped carbon skeleton and preparing nano-enzyme with structural stability and synergistic catalytic performance. According to the method, a confinement framework formed by self-assembly of first metal ions such as cobalt ions and second metal ions such as zinc ions and organic ligands is used as a template, third metal ions such as iron ions are introduced, and then carbonization heat treatment is performed in a protective gas atmosphere, so that bimetal sites with stable bridging configuration are formed in situ. The obtained nano-enzyme has the catalytic activity of various antioxidant enzymes, including catalase and remarkable superoxide dismutase activity, and has more excellent free radical scavenging capacity compared with a single-metal or non-bridging system.

The application relates to a method for removing impurity cobalt ions in zinc sulfate electrolyte, and belongs to the technical field of zinc electrodeposition and cobalt recovery. 2+ and Sb 3+ are added into the zinc sulfate electrolyte containing cobalt ions; a reducing agent zinc powder is added into the zinc sulfate electrolyte, and a replacement reaction is carried out for 50-70 min under ultrasonic strengthening conditions, so that purified slag and zinc sulfate purified liquid are obtained through solid-liquid separation. 2+ and Sb 3+ are used as activators, Sb-Cu-Co alloy is formed with Co 2+ in the zinc sulfate electrolyte, so that the hydrogen evolution is inhibited, in addition, the Sb-Cu-Co alloy can effectively reduce the Co precipitation potential, the thermodynamics of the reaction between the reducing agent zinc powder and Co 2+ is optimized, the ultrasonic wave strengthens the reaction, the reaction kinetics is improved, the production of zinc powder wrapping and agglomeration is reduced, the particle size of the purified slag is reduced, and the utilization rate of the reducing agent zinc powder is improved.

A method for producing mixed metal salts containing manganese ions and at least one of cobalt ions and nickel ions, the method including: an Al removal step of subjecting an acidic solution containing at least manganese ions and aluminum ions, and at least one of cobalt ions and nickel ions, to removal of the aluminum ions by extracting the aluminum ions into a solvent, the acidic solution being obtained by subjecting battery powder of lithium ion batteries to a leaching step; and a precipitation step of neutralizing an extracted residual liquid obtained in the Al removal step under conditions where a pH is less than 10.0, to precipitate mixed metal salts comprising a metal salt of manganese and a metal salt of at least one of cobalt and nickel.

The present invention concerns a process for producing nickel and / or cobalt comprising the steps of: a) providing an aqueous metal sulfate feed solution comprising nickel and / or cobalt ions and impurities; b) separating a first part of impurities from the metal sulfate feed solution to obtain a raffinate; c) optionally subjecting the raffinate to an ion exchange treatment to remove a second part of impurities; and d) subjecting at least a portion of the optionally ion exchanged raffinate as electrolyte to electrowinning to produce nickel and / or cobalt.

Provided are methods of producing cobalt-based nanoparticles (CoxBy NPs) of a pre-selected diameter. The methods include reducing Co2+ ions with a sodium borohydride (NaBH4) solution having a selected ratio of tetrahydroxyborate (B(OH)4−) to tetrahydroborate (BH4−) based on the pre-selected diameter, where the ratio of B(OH)4− to BH4− is positively correlated with the pre-selected diameter. Also provided are methods of using the CoxBy NPs to produce hollow metal nanospheres (HMNs). Methods of producing CoxBy NP core / metal shell structures are also provided, such methods including combining in an anaerobic galvanic exchange reaction a deaerated solution including CoxBy NP scaffolds and a deaerated solution including a metal. Also provided are methods of producing HMNs from the CoxBy NP core / metal shell structures. Compositions and kits that find use in practicing the methods of the present disclosure and using HMNs produced in accordance with the methods of the present disclosure, are also provided.

The invention belongs to the technical field of sterilization and disinfection materials, and particularly relates to a wrapped slow-release chlorine composition and a preparation method and application thereof.The composition is of a unique dual-wrapping structure, the core is a mixture of sodium chlorite and a stabilizer, the composition is primarily wrapped with hydrophobic modified chitosan microspheres and then combined with citric acid, and the wrapped slow-release chlorine composition is prepared. And finally, the metal coordinated polyethylene glycol hydrogel is used for outer layer coating to form a complete slow-release system. The preparation method comprises the following steps: firstly, preparing a microsphere carrier through hydrophobic modification and cross-linking curing of chitosan and lauric aldehyde; then, polyethylene glycol amine and a derivative of pyridinedicarbonyl chloride are subjected to cobalt ion coordination to form hydrogel; finally, the chlorine source components are combined and formed through adsorption, mixing and coating processes in sequence. The composition can effectively control the release rate of the chlorine component, has long-acting and stable sterilization and disinfection effects, and can be widely applied to the fields of water treatment, food preservation, medical instrument disinfection, agricultural disease control and the like.

The invention relates to the technical field of photoelectrocatalysis, in particular to a Co (II) coordination polymer photoelectrode crystalline material and a preparation method and application thereof. The Co (II) coordination polymer {[Co (H2O) (Br-BDC) (BMIP)]. H2O} n is obtained from organic ligands BMIP, H2 (Br-BDC) and cobalt salt through a solvothermal method, cobalt (II) ions serve as three connection nodes, BMIP and H2 (Br-BDC) ligands serve as bridging ligands to be in mutual bridging, a two-dimensional honeycomb structure is formed, and a three-dimensional supramolecular structure is formed between layers through intermolecular hydrogen-bond interaction and pi-pi stacking. Wherein H2 (Br-BDC) is 2, 5-dibromoterephthalic acid, BMIP is 1, 3-bis (dimethylimidazolyl) propane, and n is a positive integer. The Co (II) coordination polymer shows relatively good photoelectric property, has the potential of serving as a photoelectrode material, has good optical and electrical characteristics, can be used for constructing an efficient photoelectrocatalysis water decomposition system, and has an application prospect in the aspects of photoelectric hydrolysis water oxidation and the like.

The application discloses a morphology-controllable cobalt-based MOF catalytic electrode and a preparation method and application thereof, and belongs to the field of nanometer catalytic material preparation technology and hydrogen production by water electrolysis. The MOF catalytic electrode is prepared by using divalent cobalt ions and a novel 2,4,6,-tris(3,5-dicarboxyphenylamino)-1,3,5-triazine organic ligand as precursors, N,N-dimethylformamide and methanol as solvents, and a hot solvent method in situ growth on a substrate. The morphology of the MOF and the catalytic performance can be controlled by adjusting the solvent ratio, the preparation temperature and time and other conditions. The novel MOF catalytic electrode prepared by the application does not use noble metals, the used material is relatively low in price, can be directly used as a high-performance oxygen evolution and hydrogen evolution electrode, does not need to additionally introduce a binder and is firmly combined with the electrode, simplifies the electrode / catalyst preparation process and has good catalytic stability, and therefore has a wide application prospect in the field of alkaline water electrolysis hydrogen production.

A luminescent material is a complex with the following structural formula: wherein R and R' are independently selected from oxygen, amino, C1-C18 straight-chain or branched alkyl-substituted amino, phosphin, C1-C18 straight-chain or branched alkyl-substituted phosphin, sulfur, and selenium; R1, R2, R3, R4, R5, and R6 are independently selected from hydrogen, C1-C18 straight-chain or branched alkyl or halogen-substituted C1-C18 straight-chain or branched alkyl, aromatic... Aromatic groups such as benzene, thiophene, and furan, n = 1–3, are used to construct cyclic ligand skeletons with different half-ring numbers. Ln is one of the following: cerium trivalent ion, europium divalent ion, ytterbium divalent ion, and samarium divalent ion. M is one of the following: manganese divalent ion, cobalt trivalent ion, chromium trivalent ion, vanadium trivalent ion, and ferric trivalent ion. X is a monovalent ion, such as halogen, cyanide, thiocyanate, isothiocyanate, etc., m = 0–3, l = 3–6. X acts as a monodentate ligand or as a bridging bidentate ligand.

This invention discloses a novel cobalt ion highly sensitive and selective colorimetric reagent and its applications. The structural formula of the novel cobalt ion colorimetric reagent is shown below. The azo colorimetric reagent of this invention showed high sensitivity to Co in the detection of seventeen metals. 2+ For specific detection, a buffer solution and surfactant are added to the test solution, followed by the addition of a colorimetric reagent. The Co content in the solution... 2+ It forms a stable orange-red complex with the colorimetric reagent in an acidic environment. The maximum absorption wavelength of the cobalt complex is 426 nm, and the detection limit of cobalt is 5 × 10⁻⁶. ‑3 mg / L, detection limit is 1×10 ‑2 The detection limit is low and the sensitivity is high (mg / L). This invention uses spectrophotometry for cobalt ion detection, where the chromogenic compound is an environmentally friendly material that does not cause environmental pollution during the detection process. It does not require large instruments and equipment, and is simple, efficient, and convenient to operate.

The invention relates to a high-purity ethylene production method and system. The production method comprises the following steps: S1, gasifying: pressurizing an industrial ethylene raw material and gasifying; s2, primary adsorption and purification: feeding the gasified industrial ethylene raw material gas into a primary adsorber for primary purification, and removing H2O, C2H2, CO2 and hydrocarbon impurities above C3 from the raw material gas through the primary adsorber; s3, secondary adsorption and purification: introducing the primarily purified ethylene gas subjected to primary adsorption and purification into a secondary adsorber, and carrying out adsorption-expansion desorption to obtain quasi-high-purity ethylene; s4, entering a multi-stage membrane filtration unit: enabling the quasi-high-purity ethylene subjected to secondary adsorption purification to sequentially penetrate through a plurality of membranes loaded with metal ions, so as to obtain high-purity ethylene; the metal ions are one or a mixture of more of silver ions, cobalt ions, copper ions and titanium ions. Compared with the prior art, the method provided by the invention has the advantages of short flow, low energy consumption, good separation effect, strong process continuity, high product purity and low impurity content, and can meet the production of high-purity ethylene above G5 requirements.

The invention relates to the technical field of environmental catalysis and advanced oxidation, in particular to a composite catalyst based on abnormal adsorbate type strong metal-carrier interaction (AA-SMSI), a preparation method of the composite catalyst and activation application of the composite catalyst to potassium peroxymonosulfate (PMS). The composite catalyst comprises a nanoscale carrier CeO2 and cobalt nanoparticles which are loaded on the carrier and have a core-shell structure. The unique core-shell structure of the composite catalyst effectively inhibits leaching of cobalt ions and aggregation of nano particles through physical packaging, the stability is greatly improved, the under-coordination shell layer of the composite catalyst also serves as a high-activity site, the PMS activation capacity is remarkably enhanced, and therefore ultrahigh activity and stability are achieved at the same time. The preparation process of the composite catalyst is mild, controllable and environment-friendly, a new thought is provided for breaking through the bottleneck that activity and stability in a traditional catalytic system are difficult to consider at the same time, and the composite catalyst has wide application prospects in the fields of advanced oxidation, industrial wastewater treatment and environmental catalysis.

The invention provides a preparation method of a cobalt-ruthenium double-site catalyst and application of the cobalt-ruthenium double-site catalyst in synthesis of 2, 5-furandicarboxylic acid. A lignin-based cobalt-ruthenium double-site catalyst is utilized, oxygen or air is used as an oxidizing agent, and high-selectivity conversion of 5-hydroxymethylfurfural into 2, 5-furandicarboxylic acid is realized. According to the catalyst, lignin rich in functional groups serves as a raw material, cobalt ions are anchored through nitrogen doping and metal coordination technologies to achieve uniform dispersion of Co monatomic atoms, and then controllable loading of Ru sub-nanoclusters is achieved through an impregnation method. The double-site catalyst has excellent performance at normal temperature and normal pressure (the HMF conversion rate is greater than 95%, and the FDCA yield is greater than 90%), and is superior to the traditional and conventional single-component catalyst. The catalyst used in the invention is green, environment-friendly and recoverable, solves the problems of harsh reaction conditions, high cost and low environmental friendliness of the existing system, and provides key support for industrialization of biomass-based chemicals.

This invention relates to a method for preparing electronic-grade hydrofluoric acid. The invention utilizes a microchannel reactor for the fluorine oxidation reaction, significantly reducing fluorine consumption and safety hazards during production. Furthermore, the microchannel reactor enhances the gas-liquid two-phase mass transfer during the oxidation reaction, further improving impurity removal and product quality. The addition of multi-effect distillation to the distillation process not only enables secondary heat utilization but also saves on the use of high-temperature heating media at the bottom of the column, effectively reducing energy consumption. In the modified liquid, DMF serves as the solvent, cobalt nitrate provides cobalt ions, and vinylguanidine provides guanidine functional groups and amino groups. Ammonia and propanethiol are used as plasma gases to introduce amino and thiol groups onto the membrane surface. These groups help improve membrane selectivity, effectively separating metal and non-metal ions, as well as acidic impurities in the raw materials.

The invention relates to the technical field of electrical contact materials, in particular to a copper-based electrical contact composite material for enhancing electric conductivity and heat conductivity through cobalt-mediated interface engineering and a preparation method of the copper-based electrical contact composite material. (2) adding the deoiled copper powder and a conductive polymer into an initiator solution or a buffer solution; (3) filtering and collecting the polymer and the cobalt-coated copper powder; (4) drying the collected composite material precursor; and (5) carrying out hot pressing or pressing sintering to obtain the modified copper-based electrical contact material. A conductive polymer and cobalt ions are complexed and assembled on the surface of copper powder, then high-temperature sintering is performed to obtain the copper-based composite material, and cobalt catalyzes formation of high-quality graphene; the heteroatom-doped graphene is prepared through high-temperature carbonization of the conductive polymer, and the carrier concentration and the interface energy band structure of the material are optimized; and the cobalt bridging copper-carbon interface reduces electron and phonon scattering and improves the electrical conductivity and thermal conductivity of the composite material.

The invention discloses a preparation method and application of graphene aerogel, the graphene aerogel takes a graphene oxide three-dimensional network as a continuous matrix, takes hydrophilic polyimide fiber as a reinforced skeleton, and forms a metal-organic coordination bond as a functional node through coordination of ethylenediamine tetramethylenephosphonic acid and cobalt ions; and carrying out hydrothermal reaction, freeze drying and high-temperature annealing to prepare the material. The preparation method is simple, the process is easy to control, the electromagnetic shielding performance of the prepared graphene aerogel reaches 48 dB, and the graphene aerogel has good mechanical stability within the range of-75-150 DEG C; under the pressure of 1 kg, the compression time and the recovery time are 30 ms and 27 ms respectively, and the commercial standards of sensing materials and shielding materials are met.

This invention discloses a CF-Si3N4@CNTs / EP thermally conductive composite material and its preparation method. Using cotton fibers as a skeleton, silicon nitride and cobalt nitrate hexahydrate are loaded onto the surface of the cotton fibers through ultrasonic impregnation. Under high-temperature conditions, carbon-containing gas generated from urea pyrolysis is used to reduce cobalt ions to metallic cobalt, which then serves as a catalytic site for the high-temperature pyrolysis growth of carbon nanotubes. The cotton fibers are then carbonized to obtain the CF-Si3N4@CNTs composite skeleton. This composite skeleton is then vacuum impregnated and cured with epoxy resin to obtain the CF-Si3N4@CNTs / EP thermally conductive composite material. This invention effectively reduces the interfacial contact thermal resistance between the filler, fiber skeleton, and matrix by constructing a multi-level continuous thermally conductive network, significantly improving the thermal conductivity of the composite material. The process is simple, environmentally friendly, and has good application prospects.

The invention discloses a nickel-cobalt ion extraction visual contrast detection method and an extract liquid detection device, the detection method comprises the following steps: a sampling pump pumps an extract liquid in an extraction tank into a sampling pipeline, a concentration sensor of the sampling pipeline obtains the total concentration of the extracted extract liquid, and the concentration information is transmitted to a terminal; the visual detection camera adjusts the exposure time according to the total concentration of the extracted extraction liquid, photographs and samples the extracted extraction liquid in the sampling pipeline, and then transmits a photographed and sampled picture to the terminal; the color distinguishing module performs color value analysis and decomposition on the RGB color of the extracted extraction liquid picture; and comparing the RGB value of the picture of the extracted extraction liquid with the RGB value of the standard sample of the nickel-cobalt mixed solution under different concentrations to obtain the concentration value of the nickel-cobalt ions in the extracted extraction liquid. According to the detection method provided by the invention, the extraction degree can be accurately and timely fed back, the continuity of the production process is ensured, and the extraction efficiency is improved.

The invention relates to the technical field of electrochemical analysis, and discloses a cobalt ion detection method based on an ion imprinted polymer modified electrode, and the method comprises the following steps: constructing a microfluidic system, and carrying out electrochemical polymerization by enabling a precursor solution to dynamically flow through the electrode to realize uniform growth of a modification layer and dynamic embedding of Co < 2 + >; then applying pulse potential to efficiently elute Co < 2 + >; and finally, performing electrochemical detection after re-combining to-be-detected Co < 2 + >. According to the scheme, imprinting sites are uniformly distributed, the template agent is rapidly and efficiently eluted, and the cobalt ion detection performance, reproducibility and preparation efficiency are remarkably improved.

The invention discloses a composite fiber with humidity discoloration-sensing dual-mode response, and belongs to the technical field of intelligent materials. According to the invention, the fibrous humidity sensor based on the ion conductor and the color-changing fiber based on the cobalt ion coordination compound are combined, so that a humidity color-changing and sensing dual-mode response mechanism is innovatively realized, and the composite fiber with humidity color-changing and sensing dual-mode response is obtained. The composite fiber has excellent mechanical properties, so that the composite fiber can bear various kinds of stretching and bending in daily use. In addition, the composite fiber shows high sensitivity, and the sensitivity can be visually shown through color change; the performance is stable, and the consistent sensing and color changing effects can still be kept even after multiple times of recycling. Besides, the preparation process is relatively simple, complex equipment and harsh conditions are not needed, and the material is expected to be widely applied to multiple fields of flexible electronics, intelligent textiles, environment monitoring and the like.

The application relates to the technical field of material manufacturing, and discloses a preparation method of a nickel-based ternary transition metal hydroxyl oxide composite catalyst and application of the catalyst, and the preparation method is as follows: S1, a mixed aqueous solution of soluble salts of nickel ions, iron ions and cobalt ions and an alkali solution are prepared; S2, under the condition of magnetic stirring, the alkali solution is added drop by drop into the mixed aqueous solution of soluble salts, uniform precipitation is carried out, after complete precipitation, centrifugal separation is carried out, and the product MOH is obtained by washing with deionized water and anhydrous ethanol for multiple times; S3, the MOH is mixed with 84 disinfectant solution, stirring is carried out at 40 DEG C-60 DEG C for 4-6 hours, then the product is aged at room temperature for 8-12 hours, the obtained precipitate is washed by centrifugal separation with deionized water and ethanol for multiple times, and the product MOOH is obtained by drying. The catalyst prepared by the application has the advantages of easy preparation, low cost and high catalytic activity.

This invention discloses a tetrachloroaluminate-modified type A molecular sieve, its preparation method, and its application. The invention uses fly ash cenospheres as the main raw material to prepare a type A molecular sieve. Through modification with a mixture of fly ash and tetrachloroaluminate, it exhibits excellent adsorption performance for cobalt, cesium, and strontium ions. The type A molecular sieve prepared in this application has a good synergistic effect with tetrachloroaluminate, effectively solving the problems of complex processes, high costs, and poor adhesion of existing molecular sieve adsorbent preparation methods in the market. 137 Cs, 60 Co, 90 This method addresses the problem of low adsorption rates of major hazardous nuclides in radioactive wastewater such as Sr, and can be used to adsorb radionuclides in nuclear wastewater.

The invention discloses a variable-valence tin-cobalt oxide hydrogen-sensitive material as well as a preparation method and application thereof. According to the invention, Sn (OC4H9) 4 and cobalt nitrate are adopted as raw materials to prepare a solution, ammonia water is added to adjust the pH and serve as a weak reducing agent, and the obtained solution is subjected to hot reflux treatment to obtain a precursor solution; performing heat treatment on the precursor solution to obtain solid powder; and sintering the solid powder in an inert-H2 mixed atmosphere to obtain the variable-valence tin-cobalt oxide hydrogen sensitive material, namely a Co3O4-SnOx sensitive material. The material is large in specific surface area, adjustable in cobalt ion valence and high in oxygen defect distribution density, has the outstanding advantages of low working temperature, high sensitivity, good hydrogen selectivity and the like, and is particularly suitable for being applied to high-sensitivity, low-power-consumption and safe detection sensors required by hydrogen detection.