32results about How to "Excellent adsorption and desorption performance" patented technology

The invention discloses a method for recovering rhenium from molybdenum smelting waste acid and belongs to the technical field of metal rhenium recovery and recycle. The method comprises 1, filtering molybdenum smelting waste acid, and treating the filtrate by a composite aminoethylene weak basic anion exchange resin column for adsorption until adsorption is saturated, and 2, carrying out desorption on the saturated anion exchange resin column, collecting the desorption liquid and carrying out evaporation crystallization to obtain ammonium perrhenate. The composite aminoethylene weak basic anion exchange resin has large saturation adsorption quantity. The desorption liquid has rhenium content 100 times or more that of waste acid. Compared with the existing extraction method and ion exchange method, the method provided by the invention has a high rhenium recovery rate of 98% or more. Through use of solubility difference of ammonium perrhenate, ammonium molybdate and ammonium sulfate, ammonium perrhenate is purified by evaporation crystallization and ammonium perrhenate purity is 99.9% or more. The method has a simple rhenium recovery process, is environmentally friendly, is convenient for operation and is suitable for large scale production.

The invention relates to an organic inorganic hybridized material for removing heavy metal ions from sewage. The material is composed of a carrier nanometer silicon dioxide and a chemical sensor, wherein the chemical sensor is capable of selectively identifying and adsorbing the heavy metal ions; the mass percent of the chemical sensor to the nanometer silicon dioxide is (10%-50%):(50%-90%); the grain size of the hybridized material is 30-300nm; and the specific surface area is 100-900m<2> / g. A preparation method comprises the following steps: taking rice husk ash generated from rice husk combustion as raw material and preparing porous silicon dioxide, and then bonding the chemical sensor capable of selectively identifying and adsorbing the heavy metal ions with the surface of the porous silicon dioxide, thereby obtaining the organic inorganic hybridized material. The chemical sensor with excellent adsorbing property for the heavy metal ions is bonded with the surface of the porous SiO2, so that the material is suitable for being used as a removing agent for the heavy metal ions in industrial sewage. The preparation method for the organic inorganic hybridized material is simple; the capability of selectively identifying and adsorbing the heavy metal ions is strong; and the organic inorganic hybridized material has the advantages of high processing speed, regenerating property, and the like.

The invention relates to a preparation method of a multi-response graphene / graphite oxide film. The method comprises the following steps of: ultrasonically dispersing the graphite oxide in deionized water to obtain a graphite oxide aqueous solution, and then, regulating the pH value to 2-6 by using acid; placing an active metal plate in the graphite oxide aqueous solution, placing the graphite oxide aqueous solution on a horizontal platform and maintaining temperature of 10-15 DEG C, standing, taking out the active metal plate 1-7 days later, washing, drying, and peeling off the film, then, thereby obtaining the multi-response graphene / graphite oxide film. The preparation method provided by the invention is simple, and can implement large-scale and low-cost production.

The invention discloses a foam ceramic supporter, a TiO2 photocatalyst supported on the foam ceramic supporter and a preparation method thereof. The foam ceramic supporter includes foam ceramic and acomposite oxide, wherein the foam ceramic has a porous foam structure, the pore edges in the foam ceramic contain three-dimensional penetrating micro-scale pore channels, the composite oxides distributing in the surface of the pore edges and the interior of the pore channels. The preparation method of the foam ceramic supporter includes: impregnating the foam ceramic with a composite oxide precursor slurry to obtain the foam ceramic supporter. The TiO2 photocatalyst supported by the foam ceramic supporter is high in photo-catalytic activity, wherein the TiO2 is not liable to lose, so that thephotocatalyst has good activity stability and is especially suitable for photocatalytic purification of gas or liquid.

The invention relates to an organic inorganic hybridized material for removing heavy metal ions from sewage. The material is composed of a carrier nanometer silicon dioxide and a chemical sensor, wherein the chemical sensor is capable of selectively identifying and adsorbing the heavy metal ions; the mass percent of the chemical sensor to the nanometer silicon dioxide is (10%-50%):(50%-90%); the grain size of the hybridized material is 30-300nm; and the specific surface area is 100-900m<2> / g. A preparation method comprises the following steps: taking rice husk ash generated from rice husk combustion as raw material and preparing porous silicon dioxide, and then bonding the chemical sensor capable of selectively identifying and adsorbing the heavy metal ions with the surface of the porous silicon dioxide, thereby obtaining the organic inorganic hybridized material. The chemical sensor with excellent adsorbing property for the heavy metal ions is bonded with the surface of the porous SiO2, so that the material is suitable for being used as a removing agent for the heavy metal ions in industrial sewage. The preparation method for the organic inorganic hybridized material is simple; the capability of selectively identifying and adsorbing the heavy metal ions is strong; and the organic inorganic hybridized material has the advantages of high processing speed, regenerating property, and the like.

The invention relates to a layer structure catalyst for directly preparing ethylene, propylene and butene through hydrogenation of carbon dioxide. The layer structure catalyst for directly preparing the ethylene, the propylene and the butene through hydrogenation of the carbon dioxide is prepared in the steps of mixing iron nitrate nonahydrate, potassium carbonate and titanium dioxide under a certain condition and then calcining an obtained mixture at a certain temperature for two times by using a high temperature solid state method so as to prepare the layer structure catalyst. The layer structure catalyst for directly preparing the ethylene, the propylene and the butene through hydrogenation of the carbon dioxide has the advantages that a stable layer structure is obtained, the layer structure can be stably kept before and after the reaction of directly preparing the ethylene, the propylene and the butene through hydrogenation of the carbon dioxide, olefin secondary reaction caused by readsorption of primary olefin is inhibited to a certain degree, and high olefin selectivity is realized in the reaction of preparing low carbon olefin through hydrogenation of the carbon dioxide. Apreparation method is simple and environmentally friendly and has potential application values.

The invention relates to the technical field of catalytic materials and air pollution control, and aims to provide a preparation method of a cobalt-based metal organic framework derivative catalyst for catalytic decomposition of N2O. The preparation method comprises the following steps: dissolving 2-methylimidazole and a deprotonating agent in deionized water, and adding a Co (NO3) 2.6 H2O solution while fully stirring; standing for 10min at room temperature, then centrifugally washing, collecting solid precipitate and drying to obtain a precursor with a zeolite imidazate skeleton structure; firing the precursor in an inert gas atmosphere for pyrolysis; and naturally annealing and cooling to room temperature to obtain the cobalt-based metal organic framework derivative catalyst. The catalyst provided by the invention has the advantages of very large specific surface area, good dispersion performance of active sites, and excellent oxidation-reduction performance and adsorption and desorption capability; and the introduced deprotonating agent can greatly improve the coordination rate of metal ions and organic ligands, so that the reaction is rapidly carried out in an aqueous solution, and possibility is provided for industrial rapid synthesis. The catalyst has high activity, sulfur poisoning resistance and heating activity regeneration capacity.

The invention relates to the technical field of catalysts, provides a preparation method of a porous rod-like Co / C nanorod composite material, aims at the problem of high cost of a noble metal doped modified electrocatalyst, the preparation method comprises the following steps: preparing a precursor by utilizing NTA and Co (NO3) 2.6 H2O hydrothermal method, calcining the precursor, calcining in inert gas at 450-500 DEG C for 2-2.5 hours, and after calcining, cooling to obtain the rod-like porous Co / C nanorod composite electrocatalyst. The rod-like porous Co / C nanorod composite electrocatalyst is prepared from NTA and metal salt Co (NO3) 2.6 H2O through hydrothermal treatment and then tubular furnace sintering, the condition is mild, the purity is good, and the prepared rod-like porous Co / C nanorod composite electrocatalyst has high electrocatalytic activity.

The invention discloses a TiO2 photocatalyst and a preparation method thereof. The catalyst is TiO2 photocatalyst supported by a foam alumina-based supporter having a porous foam structure. The preparation method includes: preparing the alumina-based supporter, impregnating the supporter in titanium sol, and performing thermal treatment to prepare the photocatalyst. The photocatalyst has high photocatalytic activity and is very suitable for a catalytic reaction process under the effect of ultraviolet light.

The invention discloses a photocatalysis unit and a photocatalysis method thereof. The photocatalysis unit comprises a photocatalyst and a light source device, wherein the photocatalyst comprises a foamed ceramic carrier and TiO2 crystal grains distributed on the surface of the foamed ceramic carrier, the foamed ceramic carrier comprises a foamed ceramic and a composite oxide, the foamed ceramic has an open-cell foam structure, three-dimensional through micron-scale pore channels are formed in the pore edges of the foamed ceramic, and the composite oxide is distributed on the surfaces of the pore edges and in the pore channels. The photocatalytic unit has good catalytic activity and good stability when being used for purifying gas.

The invention relates to the technical field of catalytic materials and air pollution control, and aims to provide a method for catalytically decomposing N 2 Preparation of cobalt-based metal-organic framework-derived catalysts for O. Including: dissolving 2-methylimidazole and proton-removing agent in deionized water, adding Co(NO 3 ) 2 ·6H 2 O solution; after standing at room temperature for 10 minutes, centrifuge and wash, collect the solid precipitate and dry it to obtain a precursor with a zeolite imidazolate skeleton structure; burn the precursor in an inert gas atmosphere for pyrolysis; naturally anneal and reduce After reaching room temperature, a cobalt-based metal-organic framework-derived catalyst is obtained. The invention provides a catalyst with a large specific surface area, well-dispersed active sites, excellent oxidation-reduction performance and adsorption-desorption capacity; the introduced proton-removing agent can greatly accelerate the coordination rate of metal ions and organic ligands, making The reaction proceeds rapidly in aqueous solution, which provides the possibility for rapid industrial synthesis. The catalyst has excellent activity, anti-sulfur poisoning and active regeneration ability at elevated temperature.

The invention discloses a detection method for high-precision detection of volatile organic compounds, which comprises the following steps of preparing a cerium-doped mesoporous molecular sieve, sequentially carrying out aminopropyl modification, perylene-3, 4, 9, 10-tetracarboxylic dianhydride grafting and octadecyl mercaptan modification on the cerium-doped mesoporous molecular sieve, and packaging to obtain a volatile organic compound detection film, and establishing a standard curve between the concentration of the volatile organic compounds and the fluorescence intensity of the detectionfilm by utilizing the fluorescence intensity difference of the detection film to the volatile organic compounds with different concentrations, so that the high-precision detection of the volatile organic compounds is realized. In the way, the rich pore structure in the molecular sieve can be used to efficiently adsorb and desorb the volatile organic compound, the perylene-3, 4, 9, 10-tetracarboxylic dianhydride is taken as a substrate, quantitative detection of the volatile organic compounds is realized by utilizing the fluorescence effect of the perylene-3, 4, 9, 10-tetracarboxylic dianhydride, and the sensitivity, accuracy and stability of detection are effectively improved by combining the synergistic effect of all groups, so that the application range is relatively wide.

The invention discloses a photocatalytic unit and a photocatalytic method thereof. The photocatalytic unit includes a photocatalyst and an ultraviolet light source device. The photocatalyst adopts TiO supported by foam alumina-based carrier 2 In the photocatalyst, the foamed alumina-based carrier has an open-cell foam structure. When the above-mentioned photocatalytic unit is used for gas purification, it has good catalytic activity and stability.

The invention belongs to the technical field of the treatment of heavy metal ions in industrial waste water and the extraction of rare earth ions in rare earth mines, and aims to solve the problem that existing hydroxamic acid materials cannot produce polymer effects, such as high adsorption characteristics, separable, reusable and other characteristics, and The invention does not have the advantages of good physical and chemical stability and simple operation of chelating resins, and provides a hydroxamic acid functionalized polymer / inorganic composite chelating adsorption material and a preparation method thereof. It is composed of carrier micron-level silica and hydroxamic acid functionalized polymer that selectively recognizes and adsorbs heavy metal ions and rare earth ions. The particle size of the micron-level silica is 90-125 μm. The adsorption material of the present invention can effectively remove heavy metal ions in industrial wastewater and extract rare earth ions from rare earth ores. The preparation method is simple, the performance is stable, and it has strong selective recognition and adsorption capabilities for heavy metal ions and rare earth ions. It is fast and easy to regenerate, so it can be used repeatedly.

The invention discloses a method for recovering rhenium from molybdenum smelting waste acid and belongs to the technical field of metal rhenium recovery and recycle. The method comprises 1, filtering molybdenum smelting waste acid, and treating the filtrate by a composite aminoethylene weak basic anion exchange resin column for adsorption until adsorption is saturated, and 2, carrying out desorption on the saturated anion exchange resin column, collecting the desorption liquid and carrying out evaporation crystallization to obtain ammonium perrhenate. The composite aminoethylene weak basic anion exchange resin has large saturation adsorption quantity. The desorption liquid has rhenium content 100 times or more that of waste acid. Compared with the existing extraction method and ion exchange method, the method provided by the invention has a high rhenium recovery rate of 98% or more. Through use of solubility difference of ammonium perrhenate, ammonium molybdate and ammonium sulfate, ammonium perrhenate is purified by evaporation crystallization and ammonium perrhenate purity is 99.9% or more. The method has a simple rhenium recovery process, is environmentally friendly, is convenient for operation and is suitable for large scale production.

Provided are a composition for forming an absorption-desorption sheet, an absorption-desorption sheet including the same, and a method of preparing the absorption-desorption sheet. The composition for forming an absorption-desorption sheet includes: a polymerizable first monomer or oligmer comprising an ionic hydrophilic group; a polymerizable second monomer or oligmer comprising a non-ionic hydrophilic group; and a deliquescent salt that has excellent absorption-desorption performance—and allows repeated use of the absorption-desorption sheet. In addition, the absorption-desorption sheet has antibacterial and deodorant performance, and thus, is able to inhibit the growth of bacteria and fungi in a humid environment.

The invention discloses a foamed ceramic carrier, and the foamed ceramic carrier supports TiO 2 Photocatalyst and preparation method thereof. The foamed ceramic carrier includes foamed ceramics and composite oxides. The foamed ceramics has an open-cell foam structure. The pores of the foamed ceramics contain three-dimensional through-micron-scale pores, and the surface of the pores and the pores are distributed with composite oxides. The preparation method of the foamed ceramic carrier comprises: impregnating the foamed ceramic with the composite oxide precursor slurry to prepare the foamed ceramic carrier. The supported TiO prepared by the foamed ceramic carrier 2 The photocatalyst has high photocatalytic activity, and the titanium dioxide is not easily lost, and the activity stability is good, especially suitable for photocatalytic purification of gas or liquid.

Disclosed are a hydrocarbon adsorption and desorption complex including zeolite with a controlled cation type and a preparation method therefor. The hydrocarbon adsorption and desorption complex exhibits excellent hydrocarbon adsorption and oxidation performance even at a temperature lower than a catalyst activation temperature by controlling the distribution of metal ions and metal oxides, and also exhibits excellent hydrocarbon adsorption and oxidation performance even in the presence of water, by being prepared through hydrothermal treatment.

The invention discloses a preparation method and application of a hydrophobic layered bimetallic oxide catalyst. The preparation method comprises the following steps of: firstly, preparing a Pt / NiAl-LDHs catalyst precursor of which Pt ions are reduced into elementary substance Pt by an in-situ precipitation reduction process; then calcining the catalyst precursor to obtain a catalyst Pt / NiAl-LDO of which the simple substance Pt grows on layered bimetallic metal oxide laminates and among the laminates in situ. According to the invention, the prepared catalyst Pt / NiAl-LDO is further prepared into a catalyst sheet for application. Firstly, the lattice positioning effect on LDHs laminates and the induction effect of the laminate growth process on the growth of active metal precursor microcrystals are utilized to implement high dispersion of active elemental Pt particles, thereby enhancing the catalytic efficiency, reducing the consumption of Pt noble metal and lowering the cost. And secondly, the carrier NiAl-LDO obtained by roasting NiAl-LDHs has better hydrophobic performance, so that the poisoning phenomenon of the traditional Pt / C catalyst in a high-humidity environment can be effectively prevented, the regeneration frequency of the catalyst is reduced, the operation efficiency of the system is improved, and the operation cost is reduced.

The present invention addresses the problem of providing a novel adsorbent suitable for being mounted in a canister of an automobile. The activated carbon fiber sheet satisfies one or more requirements among various indexes such as specific surface area, volume of pores having a prescribed pore diameter, and sheet density. For example, an active carbon fiber sheet having a specific surface area of 1400-2300 m2 / g, a pore volume of pores having a pore diameter of more than 0.7 nm and 2.0 nm or less of 0.20-0.70 cm3 / g, an existence ratio (R0.7 / 2.0) of the pore volume of pores having a pore diameter of 0.7 nm or less to the pore volume of pores having a pore diameter of 2.0 nm or less of 5% or more and less than 25%, and a sheet density of 0.020-0.200 g / cm3 may be one embodiment.

The invention relates to a method for preparing a graphene / ferrite nano-composite electrode material. The method includes the following steps: 1. using the hydrothermal method to prepare a precursor of a nano-composite material; drying the precursor to obtain a black powder, incinerating the black powder, grinding the black powder to obtain an even graphene / ferrite nano-composite material; 2. Scattering an activated carbon, a carbon nano-tube, a carbon-black, a graphene / ferrite nano-composite material, a polytetrafluoroethylene to ethyl alcohol or deionized water, heating and stirring the mixture to obtain a semi-solid slurry, using a twin roller to roll and press the slurry, thus obtaining the graphene / ferrite nano-composite electrode material. According to the invention, the electrode material has a larger specific surface, excellent mechanical performance, electrochemical performance and circulatory stability, and excellent adsorption and desorption; can continuously prepare a large-area electrode film, is applicable to the technical fields of capacitive deionization and ultra-capacitors, and provide technical support to industrial production.

The invention relates to a preparation method and application of a novel graphene foam rectifying tower filler. At a high temperature, through a solvothermal way, a graphene oxide solution is subjected to molding; a metal frame structure is embedded in a process; thus, one rectifying tower filler unit is formed; a porous structure of the rectifying tower filler unit can be used as a microreactor for catalytic rectification. A novel three-dimensional graphene filler is compared with HY-Pac and Pall ring fillers, and is used for filling a rectifying tower; a graphene filler maintains a regular filler property to a great extent; the mass transfer capacity is high; the graphene filler is large in liquid holdup, and can be used as a novel catalytic microreactor; the pressure drop of the graphene filler can be decreased to 1 / 3 of that of a conventional filler.