9 results about "Irreversible adsorption" patented technology

The application discloses a filter for blood purification, which comprises a shell, an end cover and a membrane filament. A high-bio-compatibility compound is added to the material of the membrane filament, so that the hydrophilicity of the membrane filament is enhanced. The mass proportion of the high-bio-compatibility compound on the inner surface of the membrane filament is controlled to be 15-50%, so that the hydrophilicity of the inner surface of the membrane filament is enhanced, the permeability of the membrane filament is improved, the interaction between proteins and the inner surface of the membrane filament is reduced, the irreversible adsorption amount of the proteins on the inner surface of the membrane filament is reduced, and the anti-pollution property of the membrane filament is improved, so that the service life of the filter for blood purification is prolonged.

The invention discloses a method for separating whey protein from whey wastewater, which comprises the following steps: matching hydrophobically modified ferroferric oxide nano-particles with fine bubbles, providing a large amount of gas-liquid interfaces by utilizing the huge specific surface area of the fine bubbles, and separating the whey protein from the whey wastewater by virtue of the amphipathy of the hydrophobically modified ferroferric oxide nano-particles. The liquid membrane can rapidly migrate and be firmly anchored on an interface, so that the mechanical strength and stability of the liquid membrane are greatly enhanced, and the combination and fracture of bubbles are effectively inhibited, thereby forming a stable foam layer with less entrained liquid and high dryness, and improving the enrichment ratio and separation efficiency of protein. Meanwhile, the interface embedded with the hydrophobically modified ferroferric oxide nano-particles obstructs direct contact between whey protein molecules in a solution and a gas phase through a steric hindrance effect, and the excessive expansion and irreversible adsorption of the protein molecules on the interface are limited, so that the denaturation risk of the protein is reduced to the greatest extent on the molecular level.

The invention discloses a composite plateau concrete air entraining agent as well as a preparation method and application thereof, and belongs to the technical field of concrete admixtures. An existing rosin air entraining agent is subjected to amine oxide modification, an amine oxide group is introduced into abietic acid, the volume of a hydrophobic group can be increased, and therefore the air entraining capacity of the rosin air entraining agent is improved, and meanwhile the air stabilizing effect of the air entraining agent is improved through a rigid plane framework of the abietic acid; the nano particles can be almost irreversibly adsorbed on a gas-liquid interface to form a compact particle layer with high mechanical strength, the performance of stabilizing bubbles is achieved, the nano particles are subjected to amine oxide modification, the rosin air entraining agent and the modified nano particles can be self-assembled into a more stable system, and the air entraining effect is improved. The coalescence of bubbles and Ostwald ripening are effectively resisted, so that excellent stability is obtained; the hard water-resistant component can effectively resist the problem that hard water in a plateau area is difficult to bleed air; the three components cooperate to reduce the critical micelle concentration of the air entraining agent and increase the stability of bubbles.

The invention relates to a preparation method of a calcium-based porous material for adsorbing gaseous RuO4, which comprises the following steps: uniformly stirring a carrier and a pore-forming agent, adding water and an auxiliary agent for pugging and aging for 20-24 hours to form slurry, putting the slurry into an extruder for extrusion molding to obtain a porous material, and then drying the molded porous material for 5-12 hours at the temperature of 80-120 DEG C to obtain the calcium-based porous material for adsorbing gaseous RuO4. Then roasting at the temperature of 400 to 1200 DEG C for 3 to 8 hours; and after roasting, dipping in a calcium-containing solution to load calcium ions on the porous material, thereby obtaining the calcium-based porous material for adsorbing gaseous RuO4. The calcium-based porous material is a novel porous material, can irreversibly adsorb gaseous RuO4, is large in adsorption capacity, and can meet the requirements of nuclear industry application scenes.

The invention provides a preparation method of an iron lattice doped aluminum oxide membrane, and belongs to the technical field of preparation of inorganic ceramic membrane materials. According to the method, a sol-gel process is adopted, Fe < 3 + > is doped and introduced into an aluminum oxide precursor system, the doped Fe < 3 + > promotes gamma-to-alpha phase transformation temperature to be reduced on one hand, and on the other hand, grain growth and pore merging are effectively inhibited, so that the membrane pore size is remarkably reduced, and the pore size distribution range is narrowed. Fe < 3 + > and an aluminum source are subjected to co-hydrolysis and co-polycondensation in the sol stage, and a uniform iron-aluminum composite precursor system is formed; after subsequent heat treatment, Fe enters alpha-Al2O3 crystal lattices in a crystal lattice doping mode and forms a stable Fe-O-Al bonding structure, surface hydroxyl introduced by crystal lattice doping enhances the surface hydrophilicity of the membrane and weakens irreversible adsorption of protein, and thus more stable flux and better anti-pollution performance are achieved while the high protein rejection rate is guaranteed.

The invention discloses a preparation method and application of an oil-based emulsion system for selective water plugging, relating to the technical field of oilfield chemistry. The invention specifically comprises, by mass fraction, 5% to 10% of amphiphilic Janus nanoparticles, 0.3% to 0.5% of an oil-soluble nonionic surfactant, 0.2% to 0.5% of a water-soluble anionic surfactant, 0.1% to 0.2% of an oil-soluble emulsifier, 0.1% to 0.2% of a water-soluble emulsifier, and the remaining components are oil phase components, the sum of all components being 100%. The preparation method comprises the following steps: uniformly stirring the above components; the oil-based emulsion system has low viscosity and good injectability; after being injected into an oil and gas reservoir formation and contacting with a water phase, it is emulsified and thickened in situ; the amphiphilic Janus nanoparticles are irreversibly adsorbed at the oil-water interface to form a strong and highly elastic interface film; the formed emulsion has excellent stability, effectively plugs water production channels, reduces the relative permeability of the water phase, causes little damage to the oil phase, and has the characteristic of selective plugging.

This invention relates to the field of wastewater treatment technology, specifically to an ozone catalyst, its preparation method, and its application. The ozone catalyst uses a composite material of boron-doped activated carbon and nitrogen-doped carbon dots as a matrix, and is loaded with manganese, cerium, and copper. The nitrogen-doped carbon dots effectively anchor metal ions, forming uniformly dispersed metal-nitrogen-doped carbon dot active sites, which not only prevents the aggregation of metal oxide nanoparticles but also maximizes the exposure of active sites. Simultaneously, combined with the stabilizing effect of CeO2, the metal active components are firmly anchored, reducing the metal dissolution rate. Furthermore, the hydrophobic-hydrophilic balance on the surface of the ozone catalyst support and the chemical inertness of the carbon material effectively reduce the irreversible adsorption of natural organic matter and anions in the water at the active sites, preventing catalyst deactivation and improving the catalyst's resistance to poisoning.

The invention relates to the technical field of catalysts, and discloses a reverse-phase Cu-based catalyst with weak CO adsorption, a preparation method and application thereof, and a catalytic hydrogenation method, the catalyst comprises an active component and an auxiliary component, the active component is copper, and the auxiliary component is selected from at least one of VIB group metal elements, VIIB group metal elements, IIIA group metal elements and IVA group non-metal elements; on the basis of the total mass of the reversed-phase Cu-based catalyst, the content of the active component in terms of elements is 75-99.99 wt%, and the content of the auxiliary component in terms of oxides is 0.01-25 wt%; at least part of the active components exist in the form of simple substances, and the irreversible CO adsorption capacity of the reversed-phase Cu-based catalyst at 170 DEG C is not higher than 8 [mu] mol CO / gcat. The catalyst has relatively high impurity poisoning resistance, can be applied to hydrogenation of catalytic crude hydrogen and waste hydrogen, can omit a crude hydrogen and waste hydrogen separation step, and is beneficial to reducing the industrial cost.

The invention provides a modified molecular sieve for efficient adsorption of electronic grade thionyl fluoride, an adsorption system and application. The efficient adsorption system for the electronic-grade thionyl fluoride comprises adsorption towers which are arranged in series, wherein the upper layer in each adsorption tower is filled with silica gel, the middle layer in each adsorption tower is filled with a mixture of a modified molecular sieve / silica gel, the lower layer in each adsorption tower is filled with a modified molecular sieve, and the modified molecular sieve is formed by passivating silicon hydroxyl on the surface of the molecular sieve at a high temperature in an NF3 atmosphere so as to reduce irreversible adsorption loss of SOF2. According to the modified molecular sieve for high-efficiency adsorption of electronic grade thionyl fluoride, the adsorption system and the application, NF3 atmosphere and part of silicon hydroxyl (Si-OH) on the surface of the molecular sieve are subjected to passivation reaction at high temperature to form (Si-O-F), so that active sites on the surface are reduced, irreversible adsorption loss of the silicon hydroxyl and SOF2 is prevented, and the adsorption efficiency of the electronic grade thionyl fluoride is improved. And further, the yield of SOF2 can be increased by 3-5%.