14results about How to "Fast adsorption rate" patented technology

This invention belongs to the field of wet electronic chemicals technology, specifically relating to a method for preparing electronic-grade hydrogen peroxide. The method includes the following steps: adjusting the concentration of raw hydrogen peroxide, and then filtering it sequentially through a reverse osmosis membrane, a modified cation exchange resin, an anion exchange resin, and a mixed ion exchange resin to obtain electronic-grade hydrogen peroxide. The modified cation exchange resin used is modified based on conventional cation exchange resin through pore expansion and grafting, optimizing the spatial matching of pore structure and functional sites. This achieves passivation of metal ions, enhanced adsorption capacity, and improved oxidation resistance, as well as a deep synergistic effect of these three effects. Ultimately, it achieves the dual goals of efficient purification and stable operation of the resin in the hydrogen peroxide system. The resulting electronic-grade hydrogen peroxide can reduce the content of single impurity metal ions to below 5 ppt, meeting the requirements of SEMI G5 standards, and can be directly applied to high-end manufacturing fields such as semiconductor wafer cleaning.

The invention discloses a magnesium-doped calcium carbonate adsorbent and a preparation method and application thereof, the chemical formula of magnesium-doped calcium carbonate is as shown in the following formula (1): MgxCa1-x (CO3), x represents the molar ratio of magnesium to calcium, 0 lt; xlt; and 0.200%. Compared with pure calcium carbonate, the adsorption rate of the adsorbent based on the magnesium-doped calcium carbonate material provided by the invention is greatly improved, so that passivation of the pure calcium carbonate in the early stage of adsorption is relieved. Under the condition of the same phosphorus adsorption amount, the adsorption rate of the adsorbent is obviously improved. Alternatively, under the same adsorption time, the phosphorus adsorption amount of the adsorbent provided by the invention is obviously improved. The adsorbent provided by the invention has good adsorption selectivity (competitive ion interference resistance), so that the adsorbent has high practical application value. In addition, as the preparation is simple and convenient and the cost is low, the compound can be used as an agricultural fertilizer slow-release agent, can maintain the phosphorus content in farmland for a long time, and is more beneficial to the growth of crops.

The application discloses a coke oven gas deaminating agent and a preparation method thereof. The deaminating agent takes zinc and copper metal salts as active components, nickel and cobalt metal salts as auxiliary component, and takes magnesium aluminate spinel prepared from aluminum oxide and magnesium oxide as a carrier. The deaminating agent has the characteristics of high deaminating activity, high ammonia content penetration, and renewable utilization, is used for gas phase deamination, and is particularly suitable for a coke oven gas purification process, and can reduce the ammonia content to 0.1 ppm.

This invention belongs to the field of iodine adsorption material technology, and discloses a method for synthesizing and applying a highly efficient iodine adsorption material. The synthesis method includes: S1, adding an organic aldehyde ligand to a container, adding a solvent, and stirring to completely dissolve the aldehyde ligand; S2, slowly adding the above solution dropwise to an organic amine ligand solution to completely mix it with the amine ligand; S3, sealing the above mixed solution and stirring at room temperature until the color deepens; S4, after the reaction is complete, separating the reaction solution into small glass vials, tightening the caps, loosening them by half a turn, and placing them in a protective atmosphere; after several days of gas-liquid diffusion, visible crystals form at the bottom of the glass vials. The synthesized adsorption material has applications in volatile and radioactive iodine. The crystalline adsorption material synthesized by this invention has good stability, high adsorption efficiency for iodine, and a fast adsorption rate, and can be used for nuclear waste treatment and the capture of radioactive iodine.

The utility model discloses a device for adsorbing organic pollutants by a biochar composite material, which comprises a filtering cabin, a water passing cabin is arranged on the upper half part of the outer side of the filtering cabin in a communicated manner, a water outlet is formed in the bottom of the filtering cabin, the device further comprises a top water inlet of the water passing cabin, and a detachably connected filtering plate is arranged in the water passing cabin; the stirring assembly is rotatably arranged in the filtering cabin through a bearing, and the stirring assembly is connected with the output end of the driving motor; the limiting components are distributed on the middle lower half part of the inner wall of the filtering cabin in a circumferential matrix manner; the adsorption assembly is detachably connected into the filtering cabin through a limiting assembly, and a window is formed in the outer wall, opposite to the adsorption assembly, of the filtering cabin. According to the device for adsorbing the organic pollutants through the biochar composite material, the problems that in the existing adsorption mode that a biochar rod is installed on a rotating rod, abrasion, crushing and the like are prone to occurring, and the operation and maintenance cost is greatly increased are solved.

This invention discloses an adsorption method and apparatus for refined base oil, relating to the field of base oil adsorption technology. The adsorption method proposed in this invention can solve the problem of poor color and short service life caused by the presence of small amounts of gums, asphaltenes, and residual carbon in base oil, without polluting the ecological environment. The adsorption apparatus proposed in this invention includes a reaction chamber; a rotating cylinder is rotatably installed inside the reaction chamber, with a threaded portion on the outer side of the cylinder. The cylinder has a hollow structure, and its interior is divided into two chambers for storing raw materials by a partition. A mixing rod is rotatably installed at the bottom of the cylinder, with its top end communicating with the two chambers. A filter element is vertically slidably installed inside the reaction chamber for quickly filtering precipitates. This adsorption apparatus can accelerate the removal of precipitated substances and improve adsorption efficiency.

This invention proposes a fast-adsorption, hydration-product-resistant water-reducing agent and its preparation method, belonging to the field of concrete admixture preparation technology. This invention uses a polyether macromonomer, acrylic acid, long-branched functional monomer a, and long-branched functional monomer b to prepare a copolymer via free radical polymerization. Long-branched functional monomer a is modified allyl epoxy ether sodium phosphate with a weight-average molecular weight of 10,000-14,000 g / mol; its phosphate groups preferentially adsorb onto the surface of cement particles, and the long branching delays the covering of hydration products. Long-branched functional monomer b is a copolymer of hydroxyethyl acrylate, hydroxypropyl acrylate, and allyl mercaptoacetate with a weight-average molecular weight of 8,000-12,000 g / mol, providing a large number of ester groups, which hydrolyze under alkaline conditions to produce secondary dispersion. The water-reducing agent of this invention can be rapidly adsorbed, with no loss of slump within 2 hours and no significant increase, significantly improving the workability of concrete, reducing the dosage of water-reducing agent, and improving early and late strength. It is suitable for general-purpose silicate cement with high fineness and high admixture content.

This invention belongs to the field of valuable metal recovery and water purification technology, and more specifically, relates to an organically covalently cross-linked alginate fiber, its preparation method, and its applications. This invention prepares alginate fibers with good water resistance through organic covalent cross-linking technology, which can be used for the recovery of valuable metals from aqueous solutions, the removal of heavy metals, the softening of drinking water, and the removal of cationic organic pollutants. It can solve the problem of calcium content in existing alginate fibers. 2+ The alginate adsorbent material prepared by ion crosslinking technology suffers from a large number of sacrificed adsorption sites, resulting in low adsorption capacity and limiting its widespread application. The organic covalently crosslinked alginate fiber designed and synthesized in this invention has the characteristics of fast adsorption rate, excellent adsorption performance, and easy solid-liquid separation. Moreover, the organic covalently crosslinked alginate fiber can be regenerated and reused.

This invention discloses a PVDF nanofiber membrane with an in-situ grown strong acid cation exchange layer, its preparation method, and its applications. The preparation method includes: electrospinning to prepare the PVDF nanofiber membrane; after surface activation, in-situ polymerization of a polymer containing sulfonic acid groups (such as polystyrene sulfonic acid) onto the fiber surface. This invention fixes the ion exchange layer to the fiber surface through chemical bonding, ensuring complete exposure of all sulfonic acid groups and eliminating the risk of detachment. The lipophilic segments in the grafted polymer chains significantly improve the wettability of the membrane to organic solvents (such as PGMEA and cyclohexanone), promoting rapid diffusion of metal ions to the exchange sites. When used in semiconductor photoresists or electronic-grade organic solvents, this membrane can deeply remove trace metal ions such as sodium, iron, copper, aluminum, and zinc to below 1 ppb, exhibiting advantages such as fast adsorption rate, high removal rate, and good cycle stability. It has broad application prospects in the field of ultrapure semiconductor wet electronic chemicals.

The present application relates to the field of adsorption materials, and discloses a hierarchical pore MOFs-based composite phase change material, a preparation method and application thereof.The MOFs-based composite phase change material comprises a hierarchical pore MOFs material having micropores, mesopores and macropores simultaneously, and a phase change material loaded in the macropore channels of the hierarchical pore MOFs material.The hierarchical pore MOFs-based composite phase change material prepared by the present application has a higher specific surface area and pore volume, and has a certain number of micropores, mesopores and macropores respectively, and the functions of the pore channels of different sizes are fully developed.In the process of adsorbing VOCs in micropores, the mesopores are beneficial to the mass transfer of rapid adsorption of the adsorbate, the adsorption rate is improved, and the phase change material in the macropores can store adsorption heat to inhibit the bed temperature rise and improve the bed adsorption efficiency.

This invention provides a method for preparing a metal-organic framework adsorbent, belonging to the field of adsorbent technology. The invention includes the following steps: dissolving a metal ion salt and an organic ligand in an organic solvent, controlling the reaction temperature and time, centrifuging, washing, and vacuum drying to obtain the metal-organic framework adsorbent; the organic ligand contains one or two of amino, carbonyl, carboxyl, sulfonic acid, and hydroxyl groups; the adsorbent selectively adsorbs glucagon-like peptide-1 analogs. This invention synthesizes a metal-organic framework adsorbent by combining a metal ion salt with an organic ligand containing groups such as amino, carbonyl, carboxyl, sulfonic acid, and hydroxyl groups. It utilizes the charged portion or specific groups in the organic ligand to form hydrogen bonds, ionic bonds, van der Waals forces, and chelation with glucagon-like peptide-1 analog molecules, achieving highly efficient and selective adsorption of glucagon-like peptide-1 analogs, exhibiting high adsorption capacity, fast adsorption rate, and good adsorption stability.

This invention discloses a thiol-functionalized polyvinyl alcohol (PVA) / sodium alginate (SA)@ZIF-67 composite hydrogel, its preparation method, and its applications. The preparation method uses PVA and SA as matrices, forming hydrogel spheres through ionic crosslinking. After adsorbing cobalt ions, thiol-functionalized ZIF-67 crystals are grown in situ in a mixed ligand solution containing 2-methylimidazole and 2-mercapto-1-methylimidazole to obtain the PVA / SA@SH-ZIF-67 composite hydrogel. This invention achieves efficient adsorption and integrated "adsorption-reduction-fixation" removal of Cr(VI) by introducing thiol-functionalized ZIF-67 into the hydrogel network, utilizing the strong coordination and chemical reduction effects of thiol groups on hexavalent chromium. This composite hydrogel has advantages such as large adsorption capacity, high removal efficiency, and easy separation and recovery, and has broad application prospects in the field of heavy metal wastewater treatment.

The application discloses a preparation method of a lithium extraction adsorption membrane based on electrostatic spinning, and the method comprises the following steps: loading metatitanic acid lithium on polyacrylonitrile by using electrostatic spinning technology to obtain a polyacrylonitrile electrostatic spinning membrane loaded with metatitanic acid lithium; and then performing pickling in a forced flow-through mode to effectively convert the metatitanic acid lithium into metatitanic acid, thereby obtaining the lithium extraction adsorption membrane based on electrostatic spinning. The metatitanic acid lithium is prepared by calcining Li2CO3 and TiO2 at high temperature. The method provided by the application fixes the powder-shaped titanium-based lithium ion sieve on the polyacrylonitrile fiber by using the electrostatic spinning and the forced flow-through pickling mode. Compared with the prior art, the lithium extraction adsorption membrane based on electrostatic spinning prepared by the method provided by the application has higher adsorption capacity and faster adsorption rate, and is convenient for industrial application.

The application relates to a method for preparing vertical graphene based on hydrothermal / melt salt assisted pyrolysis with rape pollen as a biomass precursor and application thereof, characterized in that the vertical graphene is prepared by hydrothermal / melt salt assisted pyrolysis with rape pollen as a carbon source and K2CO3 as an activating agent at high temperature. The vertical graphene preparation technology developed by the method successfully constructs vertical graphene (VG) with three-dimensional vertical open channels, high specific surface area and rich oxygen-containing functional groups by utilizing the natural biological template effect of rape pollen, combining hydrothermal pretreatment with melt salt pyrolysis. The structure not only effectively solves the stacking problem of traditional two-dimensional graphene sheets, but also provides sufficient adsorption sites and unblocked mass transfer paths. The vertical graphene shows extremely high adsorption capacity and rapid adsorption rate for water ring ciprofloxacin (CIP) and exhibits excellent performance in the field of antibiotic wastewater treatment.