38results about How to "Firmly loaded" patented technology

The invention relates to a preparation method of magneitc polymer microspheres for in situ immobilization of a noble metal catalyst, and belongs to the field of polymer material and nanocomposite. The preparation method comprises the following steps of: firstly preparing hydrophilic magnetic Fe3O4 nanoparticles with high magnetic responsibility by the utilization of a solvothermal method; forming a hydrogen bond by the hydrophilic magnetic Fe3O4 nanoparticles with a hydrophilic functional monomer through adsorption; and preparing the monodispersed magnetic polymer microspheres with high magnetic responsibility and with functional groups on the surface by an in situ free radical polymerization method. By electrostatic adsorption between the functional groups on the surface and a noble metal salt solution and in situ loading of the noble metal nanoparticles for degradation of pollutants, the magneitc polymer microspheres show a stable and efficient catalytic activity.

The present invention is a silicon oxide-immobilized organic tin catalyst for transesterification of dimethyl carbonate and phenol ester, and a preparation method thereof, wherein the silicon oxide-immobilized organic tin catalyst is prepared by using the silane reagent of alkyl tin chloride as an organotin precursor, the basic composition comprises alkyl tin chloride and silicon oxide, alkyl tin chloride is used as an active component, and silicon oxide is used as a carrier. According to the present invention, the silicon oxide-immobilized organic tin catalyst shows excellent catalytic performance in the dimethyl carbonate and phenol ester transesterification reaction for synthesis of diphenyl carbonate, wherein the phenol conversion rate is 50.6%, the transesterification selectivity is more than 99.9%, and the catalyst is a heterogeneous catalyst, can reduce the toxicity of organotin, is easily separated and recovered from the reaction system after the reaction, and can be reused.

The invention discloses an anticoagulation modification method for a hemodialyzer and an application thereof. The anticoagulation modification method for the hemodialyzer comprises the following steps: triggering polymerization cross-linking reaction of a uniform mixed reaction system of olefine acid monomer, sodium sulfonate monomer, cross-linking agent monomer, initiator and water under a protective atmosphere, thereby acquiring an active heparinoid aqueous solution; keeping the membrane silk inner surface of hemodialyzer in touch with the active heparinoid aqueous solution, and then separating; heating the hemodialyzer under an acidic condition and performing auto-agglutination cross-linking, thereby acquiring the hemodialyzer with high anticoagulation property. The hemodialyzer prepared according to the invention has excellent blood compatibility and high anticoagulation property; the anticoagulation modification technology is based on a water-base system in the whole process; during the whole modifying process, only the required heparinoid substances and water are introduced; the posttreatment, such as subsequent cleaning of membrane silk, is simple; the processing steps are simple, easy for operation and realization and easy for industrial production and popularization.

The invention discloses a method for catalytically degrading phthalate pollutant by directly utilizing sunlight, and belongs to the technical field of environmental engineering. The method comprises the following steps: preparing supernate by using low-price easily-available urea as a raw material through stepwise roasting, ultrasonic peeling and centrifuging; drying to obtain nano-carbon nitride having grain size mainly distributed in a range of 30-50nm; and modifying with a coupling agent, dispersing in a methyl alcohol solution, uniformly applying and immobilizing to the inner surface of a pre-treated glass container. The treated glass container serving as a catalyst can be used for remarkably accelerating the degrading process of phthalate under sunlight radiation, and the removal rate can be 95-100 percent. The method is applicable to actual operation of a pollutant treatment field, has high efficiency and low cost, is beneficial innovation of introducing sunlight catalysis to the environmental engineering; the catalyst is a non-metallic ingredient, does not have secondary pollution risk, has uniform and firm immobilization, is convenient for reclaiming and recycling after reaction, and has relatively good commercial value and application prospect.

The invention discloses a preparation method for a porous biomimetic catalytic material and application thereof. The preparation method comprises the following steps of dissolving chitosan into acetic acid solution, stirring and dropwise adding ammonia water until the pH value is between 6.5 and 7; adding 4-(p-carboxy phenyl) metalloporphyrin ethanol solution, stirring for 24 h, and then adding NH4HCO3 solution, and uniformly stirring; drying by an infrared lamp, and performing vacuum drying to obtain the porous biomimetic catalytic material. The porous biomimetic catalytic material comprises the following components in part by weight 17.6 parts of chitosan, 8.78 parts of glacial acetic acid, 0.0878 part of ammonia water, 0.0176 part of metalloporphyrin, 43.9 parts of ammonium bicarbonate, 500 parts of distilled water and 100 parts of ethanol. Compared with the metalloporphyrin homogeneous catalytic material, the porous biomimetic catalytic material has the advantages that the metalloporphyrin is less in using amount and lower in cost and is easier to separate. The porous biomimetic catalytic material can obviously improve the one-way conversion rate of cyclohexane and the yield of main products and can be reused at least seven times, the average conversion rate of the cyclohexane is between 15.2 and 17.0 percent, and the average conversion rate of ketone alcohol is between 10.9 and 12.7 percent.

The invention discloses a preparation method of a silver oxide loaded porous membrane. The preparation method comprises the following steps: 1, polyurethane solution preparation: preparing a polyurethane solution from 15-20 parts of polyurethane particles and 80-110 parts of solvent; 2, locating solution preparation: adding 12-20 parts of activated carbon powder into the polyurethane solution, andcarrying out uniform stirring and defoaming to obtain a coating solution; 3 activated carbon based porous film preparation: uniformly coating release paper with the coating solution, then, immersingthe release paper into an aqueous solution, carrying out curing to form a film, then, taking out the film, carrying out drying, and then, stripping off the release paper; and 4, silver oxide loading:immersing an activated carbon based porous film into a silver nitrate solution, carrying out adsorption in a dark place, then, immersing the activated carbon based porous film into a sodium hydroxidesolution, taking out the activated carbon based porous film, washing the activated carbon based porous film, and drying the activated carbon based porous film to obtain the silver oxide loaded porousmembrane. The silver oxide loaded porous membrane prepared by using the preparation method has the characteristics of immobilization firmness, simplicity in recovery, repeated use and no secondary pollution and can be used for water resource purification and disinfection.

The invention discloses a highly anti-coagulant polystyrene microsphere and preparation and application methods thereof. The highly anti-coagulant polystyrene microsphere comprises a polystyrene microsphere body and an anti-coagulant modification layer formed on the surface of the polystyrene microsphere body, wherein the anti-coagulant modification layer comprises a heparinoid functional layer, and the heparinoid function layer comprises an active heparinoid polymer prepared by polymerizing and crosslinking olefin acid monomers, sodium sulfonate monomers and crosslinking agent monomers. The preparation method of the highly anti-coagulant polystyrene microsphere comprises subjecting the olefin acid monomers, the sodium sulfonate monomers, the crosslinking agent monomers and initiators to polymerization and crosslinking reaction to obtain an active heparinoid aqueous solution, subjecting the polystyrene microsphere body to contact with the active heparinoid aqueous solution and then auto-polymerization and crosslinking under acid conditions to obtain the highly anti-coagulant polystyrene microsphere. The prepared highly anti-coagulant polystyrene microsphere is high in blood compatibility, and meanwhile, the preparation method of the highly anti-coagulant polystyrene microsphere is simple in technical process, easy to operate and implement and applicable to industrial productionand popularization.

The invention relates to a preparation method of a magnetic-cellulose-microsphere-immobilized lipase catalyst. The object is to provide a simple, economic, and efficient preparation method of an immobilized lipase catalyst. The adopted process and method comprise: taking cellulose as a raw material, taking solid calcium carbonate particles as a pore-forming agent, through adoption of a hot melt adhesive conversion method and combination with reverse suspension technology, preparing porous regenerated cellulose microspheres, carrying out epoxidation and amination grafting modification, taking micropores as a reactor for a co-precipitation reaction to prepare magnetic cellulose microspheres, and using a covalent bonding method to immobilize lipase molecules to surfaces and micropores of the magnetic cellulose microspheres. The method is abundant and available in raw materials, and the prepared magnetic cellulose carrier is relatively small in size, uniform in distribution, and large in specific surface area. Compared with a catalyst made from a conventional method, the catalyst is high in enzyme immobilization amount, good in dispersion, and firm in loading. The catalyst is convenient to recycle, and can be widely applied to fields of medicine, environment, and energy.

The invention relates to a montmorillonite immobilized chiral compound and a preparation method thereof. The preparation method comprises: dispersing montmorillonite in water, adding sodium hydroxide,stirring, filtering, washing to be neutral, and drying; taking a transition metal salt, dissolving in water, taking a chiral compound, and dissolving in a second solvent; adding the prepared chiral compound solution into the transition metal salt solution; adding water into the prepared montmorillonite, uniformly stirring, and adding the metal cooperation compound into the montmorillonite suspension in a dropwise manner; filtering, and cooling to obtain the product. According to the invention, the product is stable in immobilization, and the immobilized chiral compound cannot be detected in asolution after being washed more than 100 times with a liquid chromatographically pure solvent.

The invention relates to the technical field of organic-inorganic hybrid materials, and particularly discloses a preparation method and application of a visible light responsive organic-inorganic hybrid membrane, the method comprises the following steps of: contacting and mixing a silver nitrate solution and polyurethane for dissolution, then contacting the mixed solution sequentially with sepiolite and cerium oxide to obtain a coating solution, coating a substrate with the coating solution, carrying out a contact reaction on the substrate coated with the coating solution and a YX solution to obtain a hybrid film deposited with in-situ generated AgX nanoparticles, drying the hybrid film, and illuminating the hybrid film under an ultraviolet lamp to obtain the visible light responsive organic-inorganic hybrid membrane. The prepared organic-inorganic hybrid membrane has excellent photocatalytic performance of visible light response, can be used as an efficient antibacterial material and has good antibacterial ability, the preparation method is simple, and the prepared film is stable in structure and easy to recycle.

The invention relates to a method for preparing a stationary phase coating material for trace substance identification and application of the material. The method comprises the following steps of: adding carbosilane hyperbranched macromolecules with allyl terminals and MeHSiCl2 into a solvent, adding a Kastedt catalyst, and performing hydrosilylation reaction in the presence of nitrogen; adding triethylamine, fully dried cyclodextrin and fully dried tetrahydrofuran (THF) for bonding reaction; and finally cooling and separating, thus obtaining the material. The material is coated on capillary inner columns; and the material has the advantages of uniform film formation, high column efficiency and high adsorption quantity, and has analysis and identification capability for trace substances.

The invention discloses a hemoperfusion device filled with immobilized L-asparaginase and a preparation method and application thereof. The hemoperfusion device is filled with the immobilized L-asparaginase in the form of a packed column by adopting a covalent bond immobilization method and adopting a polymer carrier. The prepared hemoperfusion device filled with the immobilized L-asparaginase is safe and efficient in the aspect of treating acute lymphocytic leukemia.

The invention discloses a supported polyoxometallate material for preparing aniline through nitrobenzene hydrogenation. A prepared nitrobenzene hydrogenation reaction catalyst is a novel efficient recyclable heterogeneous catalyst which takes a nitrogen-rich covalent organic porous material as a carrier and is loaded with polyoxometallate. According to the catalyst prepared by the invention, hydrazine hydrate is taken as a reducing agent under a mild condition, and nitrobenzene is highly selectively reduced to generate aniline. The supported polyoxometallate material has the advantages of simple preparation method, small loading capacity, short reaction time, high catalyst utilization rate, high selectivity, low loss and the like, and has application value in the industrial production process.