2192 results about "Selective adsorption" patented technology

Provided are a CDI electrode and a method for manufacturing a module using the same. A hybridized electrode manufactured by the manufacturing method of the present invention can manufacture a CDI electrode capable of increasing adsorption efficiency and rate of ions and selectively adsorbing cation and anion, thereby simply and inexpensively manufacturing the CDI electrode module without using a cation-exchange membrane and an anion-exchange membrane.

The invention relates to a porous metal organic framework material based on transition metal cobalt and a preparation method thereof. The metal organic framework material is a compound with supramolecular porous network structure and formed by self-assembly of metal ions and organic ligands through coordination complexation. The porous cobalt-based metal organic framework material contains one or more metal ions, and one or more organic ligands; and at least one of the metal ions is Co (II). The porous cobalt-based organic framework material has excellent selective adsorption on CH4 in a separation process of CH4 and N2; and the advantage of adsorption selectivity on CH4 is particularly evident under low pressure. The material is particularly suitable for development and recovery of oil field gas, coal bed methane and biogas.

The invention provides a terahertz plane adsorbing material, belonging to the technical field of electromagnetic function materials and relating to an electromagnetic-wave absorbing material. The terahertz plane adsorbing material comprises a substrate, a metal reflecting layer, a dielectric layer and an artificial electromagnetic medium layer; wherein, the metal reflecting layer is a continuous metal film and is arranged on the surface of the substrate; the dielectric layer is arranged between the metal reflecting layer and the artificial electromagnetic medium layer; the artificial electromagnetic medium layer is composed of artificial electromagnetic medium units which are arrayed periodically, each unit is a centro-symmetric figure formed by metal film lines with line width which is t and comprises two sing-opening metal rings which are connected backwards with long edges at two sides of an electric snap ring resonator. The terahertz plane adsorbing material provided by the invention has two strong-absorption frequency ranges, so as to provide selective adsorption and detection at different frequency ranges, and the terahertz radiation with wider spectral range can be adsorbed, so as to improve the performance and efficiency of the terahertz plane adsorbing material.

The invention belongs to the field of adsorbing materials, and relates to an inorganic-inorganic hybrid material, particularly a graphene/clay composite material. The composite material is powdery, is compounded from porous graphene and clay, and has a porous structure; the porous graphene is inserted among clay layers through intercalation reaction; the mass ratio of the porous graphene to the clay is 1:(0.1-10); the specific area of the graphene/clay composite material is 200-250 m<2>/g, and the weight loss within 900 DEG C is 3-6 wt%; and the clay is montmorillonite, vermiculite, illite, kaolin or rectorite. The graphene/clay composite material can be easily dispersed, can be used for comprehensively and efficiently adsorbing heavy metals and organic substances, and has the characteristics of high dispersity and efficient and selective adsorbability for heavy metals and organic substances; the maximum comprehensive removal rate can reach 99%; and thus, the invention has wide prospects in industrialized application.

A novel process for the selective elimination of fatty acid compounds containing carbon-carbon double bonds in trans configuration from a substrate containing cis- and trans-isomers of said fatty acid compounds, by selective adsorption by a microporous zeolite material is disclosed. The pore size and shape of usable zeolite materials enable differentiation between cis- and trans-isomers of unsaturated fatty acid chains. The zeolite materials used have a selectivity ratio alphatrans/cis higher than 1.00; this ratio is defined based on the elution properties of cis and trans double bond containing fatty acid methylesters dissolved in n-hexane during a column chromatography experiment with the zeolite material as the stationary phase and n-hexane as the mobile phase. Besides selective adsorption of trans-unsaturated fatty acid compounds, simultaneous or subsequent total or partial hydrogenation of the double bonds in said compounds can be carried out while using the same or similar zeolite material, containing finely dispersed catalytic active metals. The majority of these catalytic active sites must be inside the pores.

The invention provides a metal organic framework material used for absorbing and separating CO2 and a preparation method thereof. The metal organic framework material is a rigid metal carboxyl compound cluster-like structure which is formed by transition metal ions and multidentate organic ligands through covalent bonds and intermolecular forces. An amine polymer is modified on the metal organic framework material; and the metal organic framework material used for absorbing and separating the CO2 has a specific surface area of 1,000 to 1,200 m<2>/g, and a pore volume of 0.4 to 0.6 cm<3>/g. The preparation method comprises the following steps of: respectively dissolving the nitrate, the chloride or the carbonate of copper or zinc and 1,3,5-trimesic acid together in a stoichiometric ratio in water or an organic solvent; mixing uniformly and sufficiently to react to obtain a BTC bridged complex crystal; and applying a product obtained by reacting an obtained BTC bridged complex crystal with the solution of polyethyleneimine to the metal organic framework material used for absorbing and separating the CO2. The material can realize selective absorption of a gas under a low pressure.

A process and composition for selectively adsorbing oxygen from a gaseous mixture. The chemisorption is carried out by a porous three-dimensional transition element complex comprised of intermolecularly bound TEC units, said units further comprised of at least one multidentate ligand forming at least one five- or six-membered chelate ring on each unit.

The invention relates to a preparation method for a thiol-functionalization MOFs material and application thereof in adsorption and removal of heavy metal ions in water. The thiol-functionalization MOFs (UiO-66-SH) material can effectively adsorb and remove the ions of heavy metal such as copper, cadmium, lead, mercury in the water. The method comprises the steps that 1, thiol-modified terephthalic acid organic ligands are synthesized; 2, the thiol-functionalization MOFs material (UiO-66-SH) is synthesized through a solvothermal method; 3, the thiol-functionalization MOFs material (UiO-66-SH) serves as an adsorbing agent to be applied to adsorption and removal for the heavy metal ions such as copper, cadmium, lead, mercury in the water. The thiol-functionalization MOFs material can efficiently adsorb and remove the ions of heavy metal such as copper, cadmium, lead, mercury in the water, and compared with ordinary UiO-66, the adsorption property of the material is significantly improved; in addition, the material can selectively adsorb and remove mercury ions on the high-concentration condition, and novel application of the material is widened.

A process for recovering Li from used Li-ion battery by ion sieve includes dissolving the Li-ion battery in acid, adsorbing the Li ions by lambda-MnO2 ion sieve, and eluting Li ions out by diluted hydrochloric acid solution. Its advantages are high recovery yield and purity, and environmentally friendly.

The present invention relates to active charcoals with improved mechanical properties. They can advantageously be used in the sweetening of petroleum fractions, as oxidation catalyst support in the conversion of mercaptans to disulphides, but also in any other type of reaction, such as, for example, for the oxidation of cyanide present in water or in the synthesis of glyphosate, and in processes for purification and/or separation by selective adsorption in a liquid phase and/or in a gas phase (decolouration of liquid foodstuffs, water treatment, air treatment, recovery of solvents, and the like).

A slurry includes a plurality of particles and at least one selective adsorption additive. The particles are preferably composite particles including a core surrounded by a shell provided by the selective adsorption additive. The slurry can be used to polish a structure including silicon dioxide or a low K dielectric film and a silicon nitride containing film, such as to form a shallow trench isolation (STI) structure or a metal-dielectric structure. The silicon nitride containing film surface substantially adsorbs the selective adsorption additive, whereas the silicon dioxide or low K dielectric film shows non-substantial adsorption characteristics to the adsorption additive. In another embodiment of the invention, silicon dioxide or low K dielectric film shows non-substantial adsorption of the selective adsorption additive at a pressure above a predetermined first pressure, and substantial adsorption of the selective adsorption additive for pressures below a predetermined second pressure, where the first pressure is greater than the second pressure.

The invention provides a composite air purificant containing nanometer mineral matters, which contains 47wt% to 78wt% of attapulgite as a natural mineral, 20wt% to 50wt% of synthetic zeolite molecular sieve as a molecular sieve, 0.5wt% to 5wt% of sodium carbonate or sodium chloride or sodium fluoride or sodium hydrogensulfite as a modifier, 0.5wt% to 5wt% of ammonium bicarbonate or sodium bicarbonate or aluminum sulfate as a foaming agent, 0.5wt% to 2wt% of dodecyldimethylbenzylammonium chloride as a surface active agent, 0.2wt% to 2wt% of nanometer photocatalyst titanium dioxide colloidal solution as a photocatalyst and 0.1wt% to 1wt% of nanometer aircatalyst titanium dioxide colloidal solution as photochemical catalysts. The composite air purificant is prepared by first drying, first pelleting, second drying, second pelleting, third drying, baking and finish product detection and package. The invention has high alternative adsorbability and high decomposition efficiency for organic pollutants in the air.

The invention discloses a super-hydrophobic reduced graphene oxide/sponge composite material and a preparation method thereof. The method includes: employing a microwave-ultrasonic wave method and using ethylenediamine as the reducing agent to reduce graphene oxide into reduced graphene oxide, and under the action of hole and other sound waves, dispersing and attaching the reduced graphene oxide to a commodity sponge, thus obtaining the super-hydrophobic reduced graphene oxide/sponge composite material. The method provided by the invention has the characteristics of simple operation, low cost, short reaction time, high efficiency and low energy consumption, and is beneficial to industrial mass production. The reduced graphene oxide/sponge composite material prepared by the method provided by the invention has excellent hydrophobic and oil absorption properties, large adsorption capacity and good stability, and can be used as a selective adsorbent for oily wastewater treatment.

The invention discloses a ZIF-8/poly(vinyl alcohol) (PVA) composite nanofiber membrane as well as a preparation method and application thereof, belonging to the technical field of preparation of functional nanofiber membranes. The method comprises the following steps of: (1) carrying out hybrid reaction on a methanol solution of soluble zinc salt and a methanol solution of 2-methylimidazole under room temperature and purifying an obtained reaction liquid after reaction ends, thus obtaining nano ZIF-8; (2) mixing obtained nano ZIF-8 with PVA, dissolving the mixture in deionized water, stirring the mixture to swell, then carrying out stirring heating reaction and cooling the reactant to the room temperature after reaction ends, thus obtaining an electrostatic spinning solution; and (3) putting the obtained electrostatic spinning solution in an injector to carry out electrostatic spinning, thus obtaining the ZIF-8/PVA composite nanofiber membrane. The method not only has the effect of overcoming the defect that the ZIF-8 material is difficult to recover and industrially apply in a water phase but also has better selective adsorption property and can be applied to sewage treatment.

An improved pressure swing adsorption process is provided for removing or separating a gas from a mixture of gases. The PSA process comprises selectively adsorbing a gas from the mixture to form a product gas having a reduced concentration of the selectively adsorbed gas and a low pressure purge stream containing a higher level of the selectively adsorbed gas than contained in the mixture. During regeneration of the adsorbent a co-current recycle stream is provided which has a pressure less than the product stream, but greater than the purge stream for recycle to feed so as to minimize loss of the product gas to purge. The PSA process is particularly useful for removing carbon dioxide from coal bed methane.

The invention discloses a manufacture and application method for a graphene transistor and a biosensor of the graphene transistor, which is low in price, avoids chemical pollution of the surface of the graphene transistor, and is suitable for integrated manufacture and mass production of the graphene transistor and the existing electronic devices. A method used for growing zinc oxide nanowires or metal nano-particles on the surface of the graphene transistor and based on the manufacture method for the biosensor of the graphene transistor is further provided. Nanometer materials on the surface of the transistor are favorable for absorbing biological active substances (such as enzyme, deoxyribonucleic acid (DNA), ribonucleic acid (RNA), aptamer, antigen or antibody) with special identification capacity. Therefore, a graphene transistor channel has capacity of absorbing target analyte selectively, and sensitivity and selectivity of a sensor based on the graphene transistor channel are improved.

A pressure swing adsorption process for the separation of nitrogen and/or CO₂ from natural gas utilizes two separate pressure swing adsorption stages, the first containing a hydrocarbon-selective adsorbent and the second containing a nitrogen- and/or CO₂-selective adsorbent. In the process, the product stream from the first pressure swing adsorption unit contains a natural gas stream having a reduced hydrocarbon content and the product stream from the second pressure swing adsorption unit is a natural gas stream having a reduced nitrogen and/or CO₂ concentration. An intermediate pressure stream containing methane from the second pressure swing adsorption unit is used to desorb the hydrocarbons from the first pressure swing adsorption unit. The C₃+ hydrocarbons can be separated as liquids from the methane.

A method for removing thiophene and thiophene compounds from liquid fuel includes contacting the liquid fuel with an adsorbent which preferentially adsorbs the thiophene and thiophene compounds. The adsorption takes place at a selected temperature and pressure, thereby producing a non-adsorbed component and a thiophene/thiophene compound-rich adsorbed component. The adsorbent includes either a metal or a metal ion that is adapted to form π-complexation bonds with the thiophene and/or thiophene compounds, and the preferential adsorption occurs by π-complexation. A further method includes selective removal of aromatic compounds from a mixture of aromatic and aliphatic compounds.

Disclosed a nitric oxide supply system of respiratory failure rescue device belongs to the disease therapy apparatus, which avoids the high concentration NO gas cylinder, the high concentration dry gas cylinder and the nitrogen-oxygen mixed gas cylinder. The invention uses the air as raw material for attaining the NO at any time without the storage and via controlling the electric discharge condition, generates NO gas at most with least NO2 harmful gas to attain the low ratio of NO2/NO. While the concentration of NO ranges from 0-200 ppm in the pulse frequency of 1-90 Hz. The invention comprises an air pump connected in series to the gas passage, a clean-dry air generating device, a flow counter, a pulse generate and control circuit, a arc discharge reactor, a particle filter film, a NO2 catalytic reduction conversion apparatus, a cooler, a particle filter film, a selective absorber and a gas monitor.

The invention relates to a preparation method and gas adsorption properties of a boron/nitrogen-doped microporous carbon material, particularly a boron/nitrogen-doped microporous carbon material prepared by using metal organic framework ZIF-8 (zeolitic imidazolate framework-8) and boron nitrogen compounds as precursors by a high-temperature sintering method and gas adsorption properties of the boron/nitrogen-doped microporous carbon material for hydrogen, carbon dioxide, nitrogen and the like. The preparation method comprises the following steps: 1) preparing the porous metal organic framework ZIF-8; 2) limiting the boron nitrogen compounds (such as ammonia borane) to the inside of the pores of the metal organic framework ZIF-8 by a solution impregnating method; and 3) carrying out high-temperature sintering on the composite material in an argon atmosphere to obtain the boron/nitrogen-doped microporous carbon material. The preparation technique is simple; and the prepared carbon material implements simultaneous doping of boron and nitrogen and centralized distribution of micropore sizes, and has favorable adsorption property for hydrogen and selective adsorption property for carbon dioxide.

The invention is concerned with the plastic framework-style bentonite composite sorbent and the preparation method. The crude bentonite or the character-changed bentonite is the main material for the composite sorbent, the thermoplastic macromolecule polymer is as the framework connecting material and also add the assistant selective material, the blowing hole-make material by the working procedure such as mixture, model melt extrude, dryness and cut grain. The preparation method is dry preparation method with simple process and without secondary pollution, the product can adjust the powder intensity, the size of the hole, the porosity, the density and the adsorbing selectivity according to the change of the selected group and dosage. The sorbent is not easy pulverization in water which can use for waste water dispose with heavy metal ion and organic infectant.

The invention discloses a method to prepare an attapulgite clay/polyacrylamide compound adsorbent. Coupling agent is adopted to react with the attapulgite clay to achieve surface functionalization, and thereby, modified attapulgite clay with a hydrophobic vinyl functional group surface is prepared; under the protection of inert gas, graft copolymerization of the modified attapulgite clay and acrylamide is conducted by solution polymerization to achieve compound adsorbent with amido functional group. The preparation method is simple and easy to operate, and has a wide prospect of application; the compound adsorbent has excellent adsorbing performance to mercury and other heavy-metal ions which can have chelate reaction with amido. When pH is 4.4, the adsorptive capacity to mercury ion is 10-15 times higher than the former attapulgite clay; when pH is 2.0, during the adsorption in the mixed-ion solution of mercury and chromium, the adsorbent has sound selective adsorption capacity to Hg<2+>.

A method for analyzing accelerant of electroplated copper includes placing copper electrode in electrolyte containing organic additives to let copper electrode absorb accelerant containing sulphur, using pure water to wash copper electrode absorbed with sulphur compound then placing copper electrode into deposit-electrolyte containing polyethylene glycol and chlorine ion and carrying out cathode circulation VA scan to deposit down copper metal, carrying out integration on obtained polarization curve to prepare out detection line. The deposit-electrolyte used in said method is also disclosed.