144results about How to "Good superparamagnetic" patented technology

The invention relates to a preparation method of a magnetic iron-based heterogeneous Fenton catalyst taking graphene as a carrier and an application. According to the method, the graphene serves as the carrier, magnetic nano-scale ferroferric oxide and nano-scale zero-valent iron (Fe0) are compounded to the surface of the graphene to serve as the heterogeneous Fenton catalyst in an in-situ growth mode, aggregation of catalytic active nano-particles can be effectively prevented by the graphene serving as the carrier, and more active sites are exposed. Besides, the graphene has high electron transfer capability, Fe0 easily transfers electrons to Fe3+ by taking the graphene as the carrier, Fe3+ is promoted to be transformed into Fe2+, so that catalytic activity of the catalyst is improved, the catalyst is easily recovered and reusable, pollutant removal efficiency is improved, phenol removal efficiency reaches 99% or more, and the used catalyst is recovered by an external magnetic field. The preparation method solves the problems that traditional Fenton catalysts are difficultly recycled and generate a lot of chemical sludge, and the preparation method has a certain economic value and practical value.

The invention discloses a preparation method for core-shell structure type carbon-coated magnetic nano particles. The method comprises the following steps: preparing metal hydroxide or metal oxide nano particles having different morphologies by adopting a hydrothermal method; modifying the surfaces of the particles; coating the nano particles by adopting a similar method (described in the specification) so as to obtain phenolic resin-coated metal oxide or metal hydroxide nano composite particles; and performing calcining and carbonizing on the obtained nano composite particles to obtain the carbon-coated magnetic nano particles. The carbon-coated magnetic nano particles prepared by adopting the method disclosed by the invention are good in dispersibility, uniform in particle size and high in stability, and have graded porous core-shell structures; in the calcining process, the morphologies of the core-shell metal hydroxide or metal oxide nano particles can be kept unchanged; the particle diameters of the nano particles and the coating thickness of a carbon layer can be adjusted according to needs. The core-shell structure type composite particles prepared by adopting the method disclosed by the invention have a superpara magnetism adsorption property, and under the action of an external magnetic field, the fast separation can be realized, so that the core-shell structure type composite particles can be expected to be applied in the fields of magnetic separation and catalyzing.

The invention relates to a Fe3O4 / C magnetic nano solid extracting agent coated with a novel carbon material, belonging to the field of chemical analysis and test instruments and equipment. The extracting agent simultaneously has large special surface area of nano material, short disperse path, magnetic separation capacity of magnetic material and strong adsorption capacity of carbon material, thereby being very suitable for pretreating large-scale and large-size water samples in batch. In addition, the solid extracting agent is simple to prepare, low in raw material cost, rapid and convenientto extract and friendly to the environment and only needs using a small amount of organic solvent in the whole process.

The invention relates to a preparation method of a magnetic copper ion imprinting silica gel material, which comprises the steps of: firstly preparing Fe3O4 nano particles by a hydrothermal method; then preparing magnetic nano particles Fe3O4.SiO2 with a compact silicon shell layer structure by hydrolysis reaction of tetraethoxysilane (TEOS); and finally depositing a porous Cu<2+> ion imprinting silicon gel layer by using Cu<2+> ions as template ions, a nitrogenous silylating reagent (aapts, H2NCH2CH2NHCH2CH2CH2Si(OMe)3) as a functional monomer, cetyl crimethyl ammonium bromide (CTAB) as a porogenic agent, and TEOS as a cross-linking agent on the surface of Fe3O4.SiO2. The agnetic copper ion imprinting silica gel material obtained by the method provided by the invention can enrich Cu<2+> ions quickly and selectively, and has excellent regenerability and acid resistance.

The invention relates to a preparation method of amino modified Fe3O4@SiO2@mSiO2 composite particles with a mesoporous structure. The preparation method comprises the steps: dispersing Fe3O4@SiO2 powder into a mixture solution of ethanol, deionized water, ammonia water and a template agent, so as to obtain a sol solution; then, dropwise adding TEOS into the sol solution, so as to prepare Fe3O4@SiO2@mSiO2 composite particles with the mesoporous structure; drying the Fe3O4@SiO2@mSiO2 composite particles, then, adding ethylene glycol into the dried Fe3O4@SiO2@mSiO2 composite particles, carrying out ultrasonic separation, then, adding a silane reagent, carrying out high-temperature refluxing while carrying out stirring so as to enable the silane reagent to be adsorbed into mesoporous pore passages of SiO2, carrying out a hydrolytic reaction, removing unreacted silane reagent or the silane reagent which is not adsorbed into the mesoporous pore passages, and finally, carrying out vacuum drying, thereby obtaining the amino modified Fe3O4@SiO2@mSiO2. According to the preparation method, SiO2 with a mesoporous structure serves as a shell layer, a nanoparticle Fe3O4 serves as a magnetic core, the stability in an acidic solution system is excellent, the difficult problem of the ordinary adsorbents that the separation is difficult after adsorption can be solved, the efficiency of adsorbing a target product is increased, and the reuse rate of an adsorbent is increased, so that the preparation method has good economic and environmental benefits.

The invention discloses a surface-aminated Fe3O4 nano particle and a preparation method and the application thereof. The method comprises the following steps: (1) in inert atmosphere, FeCl2 and FeCl3 are added into the mixed solution of sodium hydroxide aqueous solution and hydrochloric acid aqueous solution for reaction and Fe3O4 nano particles are obtained; (2) ethanol solution of the Fe3O4 nano particles is prepared; in inert atmosphere, strong ammonia water and tetraethoxysilane are added into the ethanol solution of the Fe3O4 nano particles and after reaction, modified Fe3O4 nano particles are obtained; and (3) the ethanol solution of the Fe3O4 nano particles with a good dispersion effect is prepared; in inert atmosphere, 3-aminopropyl triethoxy silane is added into the ethanol solution of the modified Fe3O4 nano particles and after reaction, the surface-aminated Fe3O4 nano particles are obtained. The aminated Fe3O4 nano particles provided by the invention can have good adsorption capacity to 5 types of phenylarsonic acid at the same time. At the same time, as the aminated Fe3O4 nano particles have superparamagnetism, centrifugalization is unnecessary for sample treatment. Thus, the steps of pretreatment of samples are greatly simplified, the pretreatment time is shortened and the efficiency of the pretreatment of samples is increased.

The invention relates to a preparation and application of a new macromolecule lipidosome. The structure is a vesicle which has a lipide dual-layer structure containing duoparental chitosan longchain alkyl quaternary ammonium salt as well as phospholipid with micromolecule. The chitosan longchain alkyl quaternary ammonium salt is characterized in that: the weight average molar mass is bigger than 2000; the chitosan longchain alkyl quaternary ammonium salt can be dissolved in chloroform and other organic solvent, which contains carboxyl, amino or quaternary ammonium salt radical and concretely is one of the duoparental chitosan longchain alkyl quaternary ammonium salt disclosed by 200710056993.4 of China Invention Patent. The surface of the macromolecule lipidosome can be connected with various Liver-Targeted preparations. The macromolecule lipidosome can carry water-soluble, oil-dissolving or duoparental materials including medicine, protein, gene, nutrition, vitamin, magnetic granule and quantum dot, etc. The macromolecule lipidosome has the advantages of high wrapping rate, simple and convenient operation, strong applicability and low cost; the macromolecule lipidosome after being covered has even distributed granule diameter which can be lower than 20nm for the smallest, has stable system and strong functions for carrying medical tiny balls and slowly controlling as well as releasing.

The invention belongs to the field of chemical analysis test instruments, and relates to a Fe3O4 magnetic nanometer solid-phase extractant which is coated by alginic acid polymers and modified by C18 silane. The extractant has the magnetic separation ability of the magnetic material, strong extraction ability of the C18 and good hydrophilic property, an ion channel and size extrusion functions of the alginic acid polymer, so that the extractant is quite suitable for the large-scale batch pre-treatment of water sample with large volume. The pollutants of alkyl phenol, phthalate ester, polycyclic aromatic hydrocarbon, full fluorine, and the like are taken as representatives of common pollutants in the water sample. For 500mL of environmental water sample, 0.1g of the extractant is used, and the efficiency of extracting the organic pollutants all reaches more than 85 percent.

The invention discloses a magnetic core-shell Fenton-type catalyst, and a preparation method and an application of the catalyst. An inner core of the core-shell Fenton-type catalyst is an Fe3O4 microsphere accumulated by nano Fe3O4 particles; a shell layer is an alternate adsorption sequence layer formed by a cationic polyelectrolyte and nano SiO2 particles; and an outermost layer of the alternate adsorption sequence layer is an SiO2 nano particle layer such as -ABABAB, wherein A is the cationic polyelectrolyte, and B is SiO2. The preparation method of the catalyst comprises the steps of preparing the Fe3O4 microsphere by a hydrothermal method, preparing the nano SiO2 particles by a sol-gel method, and assembling the cationic polyelectrolyte with positive charges and the nano SiO2 particles with negative charges on the Fe3O4 microsphere by a layer-by-layer electrostatic self-assembly method. The core-shell Fenton-type catalyst is high in catalysis efficiency and easy to recover, can be used repeatedly, can be coupled with H2O2 to form an inhomogeneous phase Fenton-type system, and can conduct catalytic oxidation on phenolic wastewater.

The invention discloses a method for preparing a ferroplatinum nano-particle. The method belongs to a high-temperature liquid phase reduction method. The method comprises the following steps: a dendritic polymer which takes a benzene ring as a core is taken as a template, and polyhydric alcohol is taken as an organic agent and a reducer so that an organic iron compound and an organic platinic compound are dissolved in the polyhydric alcohol solution of the template for gradient heating and multi-stage reaction to prepare the fcc-phase ferroplatinum nano-particle with 4-10nm average particle size, good dispersibility and better superparamagnetism. The method is simple and has the advantages of available raw materials, low cost, mild condition, low equipment requirement, environmental-friendly production process, pollution-free byproducts and large-scale industrialized production.

The invention discloses a nanometer ferroferric oxide core-carbon meso pore hollow shell complex, as well as a preparation method and application thereof. The complex is formed by ferroferric oxide particles and a carbon shell sleeved and sealed outside, wherein the carbon sheel is of a mesoporous structure with the hole diameter being 1-5nm; the grain size of the ferroferric oxide particles is 8-12nm; the external diameter of a carbon mesoporous shell is 80-100nm; the thickness of the shell is 10-20nm; and the diameter of a hollow part between the ferroferric oxide and the carbon mesoporous shell is 30-60nm. The preparation method comprises the following steps of: synthetizing ferroferric oxide nanometer nanometers through a high-temperature reflux method, using a microemulsion method to obtain a ferroferric oxide core silicon dioxide shell powder body; then depositing a layer of mesoporous silicon dioxide on the surface of a silicon dioxide shell through a chemical method to obtain a three-layer core shell structure; taking the three-layer core shell structure as a hard template, and depositing carbon in clearances of the mesoporous silicon dioxide; and finally, etching the silicon dioxide by utilizing strong alkali solution, thereby obtaining a target product. The nanometer ferroferric oxide core-carbon meso pore hollow shell complex can be used for carrying out adsorption processing in solution polluted by methylthionine chloride, congo red or phenol.

The invention discloses a method for preparing superparamagnetic iron oxide nanometer particles modified by polyvinylpyrrolidone. The method sequentially comprises the following steps that: 1) under the protection of inert gas, FeCl3.6H2O, FeCl2.4H2O and polyvinylpyrrolidone are dissolved in diglycol at the room temperature; 2) under the protection of inert gas, mixed solution of NaOH and diglycol is added to obtained tawny solution for reaction; 3) an obtained black suspension is cooled to room temperature and added with ethyl acetate for centrifugation; 4) solids obtained after centrifugation are dispersed in anhydrous ethanol, and then ethyl acetate is added for centrifugation; 5) the steps 4) is repeated twice to three times and black solids are obtained; and 6) the black solids are dispersed in deionized water, placed in a dialysis bag with the molecular weight cutoff between 10 and 15 w and dialyzed for at least 48 hours. The superparamagnetic iron oxide nanometer particles modified by polyvinylpyrrolidone are used for tracing the functions of islet graft.

The invention discloses a method for preparing a supermolecule capsule with multiple drug release stimulation and MRI radiography ability. A ferroferric oxide microcapsule is prepared as a novel multifunctional magnetic resonance noise and drug therapy medicament through a layer-by-layer self-assembly technology. Through the host-guest interaction and the Coulomb interaction of different supramolecular polymers, the medicine molecule is controllably released through the non-invasive ultraviolet radiation distributed azobenzene isomerism and the acid response Schiff base. Additionally the magnetic-targeted MRI contrast agent is obtained by encapsulating the superparamagnetic ferroferric oxide granule. The r2 relaxation rate of the microcapsule is increased by 37% to reach 125.71 mM-1S-1 compared with that of the neutral condition (92.02mM-1S-1) through the stimulation of subacidity (pH=5.6).

The invention discloses a novel mesoporous silicon sphere co-loaded medicine nano-complex and a preparation method thereof. The novel mesoporous silicon sphere co-loaded medicine nano-complex is Ce6@MMSN / DOX / Ko143@PAsp-b-PEG-FA; the preparation method comprises the following steps: selecting TEOS (Tetraethyl Orthosilicate) as a silicon source, CTAB (Cetyltrimethyl Ammonium Bromide) as a template agent and n-hexane as a pore expanding agent and synthesizing mesoporous silicon dioxide nanoparticles with a double-pore-channel core-shell structure; carrying out amination modification on the mesoporous silicon dioxide nanoparticles; synthesizing Fe3O4 nanoparticles by adopting an LSS (Liquid-Solid-Solution) phase transfer method and ligand exchange reaction; modifying and embedding superparamagnetic iron oxide nanoparticles on the surface of aminated MSN through nucleophilic substitution, so as to construct magnetic mesoporous silicon dioxide nanoparticles; taking DCC (Dicyclollexyl Carbodiimide) as a condensation agent and covalently binding a photosensitizer Ce6 through amidation; meanwhile, loading a BCRP (Breast Cancer Resistance Protein) inhibitor Ko143; then crossly linking a copolymer FA-PEG-b-PAsp; finally, loading an anti-tumor medicine DOX.

The invention provides a nano magnetic polymer microsphere and a preparation method thereof. The preparation method includes the steps: (1) preparing lipophilic Fe3O4 nano particles, (2) preparing Fe3O4 / P(St) magnetic microsphere seed emulsion, (3) preparing the nano magnetic polymer microsphere, and if appropriate, subjecting the nano magnetic polymer microsphere prepared in the step (3) to quaternized modification. The prepared surface-quaternized nano magnetic polymer microsphere has various advantages of excellent autostability, superparamagnetism, strong magnetic responsibility, narrow particle size distribution and the like, thereby having broad industrial application prospect.

The invention discloses a preparation method for a magnetic carbon nanotube demulsifier. The preparation method comprises the following steps: (1) subjecting carbon nanotubes and mixed acid to a refluxing reaction, so as to obtain oxidation modified carbon nanotubes; (2) preparing a Fe3O4 precursor solution; and (3) uniformly mixing the oxidation modified carbon nanotubes with the Fe3O4 precursorsolution, and carrying out a reaction at a temperature of 180 DEG C to 220 DEG C, thereby preparing the magnetic carbon nanotube demulsifier. According to the preparation method provided by the invention, firstly, the carbon nanotubes are subjected to oxidation modification through the mixed acid to introduce a large number of carboxyl groups and hydroxyl groups to defects and edges of the carbonnanotubes, and then, Fe3O4 nanoparticles are prepared in situ by utilizing a hydrothermal method to modify the oxidation modified carbon nanotubes; the preparation method is simple and is easy to implement; and the prepared magnetic carbon nanotube demulsifier can be used for rapidly achieving oil-water separation of oily wastewater and is relatively good in demulsification effect. A technical scheme of the invention further provides an application of the magnetic carbon nanotube demulsifier in the oily wastewater.

The invention relates to a preparation method of a composite nanofiber. The process comprises the following steps: (1) synthesizing ferroferric oxide nanoparticles; (2) preparing a core spinning liquid and a shell spinning liquid; (3) respectively filling the configured core spinning liquid and the shell spinning liquid in a 5ml injector, and preparing the composite nanofiber by using a coaxial electrostatic spinning method. The preparation process provided by the invention has the beneficial effects that PVP (Polyvinyl Pyrrolidone) / CS / Fe3O4 composite nanofiber prepared by using the process provided by the invention is good in shape, uniform in thickness and smooth in surface, and the diameter distribution is within a range of 350-800nm; ferroferric oxide is distributed in the fiber in a crystalline state, so that the composite nanofiber has a good superparamagnetic effect. The novel composite fiber integrates three different components and contains various active groups, thereby laying a foundation for subsequent modification and application. The composite nanofiber is simple in preparation process and excellent in performance, and is expected to become an excellent composite material in the field of biological medicines.

The invention discloses a method for preparing a water-soluble ferroferric oxide nano particle, relates to a nano particle, and provides the ferroferric oxide nano particle which has the grain diameter of less than 4 nm and narrow particle diameter distribution. The method for preparing the water-soluble ferroferric oxide nano particle of a typical monodisperse particle is provided. The method comprises the steps as follows: 1), anhydrous ferric chloride and trisodium citrate are immersed in diethylene glycol and heated until the anhydrous ferric chloride and the trisodium citrate are dissolved completely; 2), anhydrous sodium acetate is added into a mixed solution obtained in the step 1), and the mixed solution is waited to be dissolved completely; 3), the mixed solution obtained in the step 2) is placed into a reaction still, the reaction still is closed, and after the reaction, the mixed solution is naturally cooled to the room temperature; and 4), the ferroferric oxide nano particle is separated from the reaction solution prepared in the step 3) by a magnet, the particle is washed and dried, so that the monodisperse water-soluble ferroferric oxide nano particle is obtained.

The invention discloses a preparation method of aminated magnetic graphene. The preparation method comprises the following steps of: adding 3-6mmol of ferric iron salt into 40ml of a 0.5-6mg / ml graphene oxide solution, and stirring for 1-2 hours until the ferric iron salt is completely dissolved; adding 9-25mmol of organic base, and stirring for 30-120 minutes to obtain a graphene oxide mixing solution containing the organic base and the ferric iron salt; and transferring the prepared mixing solution into a hydrothermal reaction kettle, reacting for 8-24 hours at 150-200 DEG C, cooling to room temperature, centrifuging and washing, and carrying out vacuum drying for 24hours at 60 DEG C to obtain the amino magnetic graphene. The method disclosed by the invention has the advantages of moderate reaction, simple operation, convenient separation, high synthesis safety, low environmental pollution and the like; and the prepared aminated magnetic graphene has excellent superparamagnetism performance, and has a good application prospect on absorption, bioseparation, magnetic catalysis and other aspects.

The invention relates to a multiphase magnetic Fenton-photocatalyst which is core-shell type microsphere Fe3O4@TiO2 which is of a three-layer structure. A core Fe3O4 microsphere is formed by stacking nanometer small granules of 15-30 nm, the thickness of a transitional SiO2 layer is 50-150 nm, and the thickness of an outermost TiO2 is 100-300 nm. The prepared photocatalyst has good superparamagnetism, can be separated thoroughly in 30 s under the effect of an outside magnetic field, is easy to recycle, can be recycled, and is environmentally friendly. The multiphase magnetic Fenton-photocatalyst can catalyze hydrogen peroxide under visible light to degrade organic pollutants, a multi-channel reaction pathway is formed, and accordingly high catalytic activity is achieved. A composite microsphere is good in monodispersity and can maintain high activity of a catalyst in wastewater treatment and improve utilization rate.

The invention relates to a method for utilizing excimer laser irradiation to prepare magnetic functional textile, which comprises: adopting a coprecipitation method to prepare nanometer ferroferric oxide granules, then, using oleic acid to modify the surface of the nanometer ferroferric oxide granules, then, dipping polyester fabrics in ethanol solution which contains the nanometer ferroferric oxide granules whose surface is modified by the oleic acid, lastly, utilizing excimer laser irradiation 222nm to irradiate two surfaces of the polyester fabrics after dipping, and finally obtaining the magnetic functional textile with comparatively high fastness to washing. The magnetic functional textile which is prepared by the method has good washability, the method of the invention is simple and novel and has simple technique, few equipment, small strength damage to the polyester fabrics, low energy consumption, convenient extension and the like.

The invention provides a magnetic nano mixed semi micelle and a preparation method thereof as well as an application of the magnetic nano mixed semi micelle in adsorbing and separating a cationic dye from an environmental water sample. The magnetic nano mixed semi micelle consists of a carrier and a surface micelle layer, wherein the carrier is magnetic nano particles, the surface of the carrier is a mixed semi micelle formed by an anionic surface active agent; the magnetic nano particles are Fe3O4 or gamma-Fe2O3; and the anionic surface active agent is sodium dodecyl sulfate, sodium dodecylbenzene sulfonate or sodium n-alkyl benzene sulfonate. The magnetic nano mixed semi micelle prepared by the method provided by the invention not only has the advantages of large specific area and high adsorption capacity of a nano material, but also has good magnetic separating power of a magnetic material; when the magnetic nano mixed semi micelle is applied to solid phase extraction, the adsorption time can be greatly shortened; and the preparation method of the adsorbent is simple, low in cost and very suitable for large-scale batch processing of the environmental water sample.

The invention discloses a synthesizing method of dielectric hole ferric oxide, which comprises the following steps: adopting dielectric carbon as hard mould; stirring; leaching; dissolving ferric salt into pore path of dielectric carbon; disposing through sodium hydroxide; sintering protected by nitrogen; repeating the stirring and leaching course; sintering in the air; obtaining the product.

The invention discloses a Fe3O4 grafted copolymer heterozygote with multiple stimulus responses, and a preparation method and an application thereof. The heterozygote provided by the invention is composed of magnet-responsive Fe3O4, pH-sensitive polyacrylic acid, and redox-sensitive polymethacrylate ferrocenylformyloxyethyl ester. The preparation method comprises the following preparation process:introducing a Fe3O4 surface chain transfer agent, and grafting polyacrylic acid and polymethacrylate ferrocenylformyloxyethyl ester onto the surface of Fe3O4 through two continuous steps of reversible addition-fragmentation chain transfer polymerization so as to obtain a Fe3O4 grafted acrylic acid-methacrylate ferrocenylformyloxyethyl ester segmented copolymer heterozygote. The heterozygote provided by the invention can be self-assembled into a spherical core-shell micelle in water, shows stimulus responsiveness to magnet, pH and redox, has the characteristic of releasing multiple stimulus responses to an anti-cancer drug namely paclitaxel, and can be used as a carrier of a hydrophobic drug and applied to targeted therapy of cancer.

The invention discloses a preparation method of CD133 immunomagnetic beads. The preparation method comprises the following steps: preparing magnetic beads; preparing magnetic chitosan microspheres; weighing 10 g of chitosan, and adding the weighed chitosan into 200 ml of a 2% acetic acid solution for overnight soaking to enable dissolution; adding 1 g of Fe2O4 nano magnetic beads into the mixed solution, and performing stirring at the room temperature under the condition of 300 r / min; adding 200 ml of saxoline, and performing stirring at 40 DEG C under the condition of 300 r / min; raising the temperature to 50 DEG C, adding 40 ml of formaldehyde, and performing stirring under the condition of 300 r / min; adding 20 ml of glutaraldehyde with the volume concentration of 50% into the mixed solution, performing stirring at 60 DEG C under the condition of 170 r / min, adjusting the pH to be 10, and performing stirring for 2-6 h; adding 100 ml of petroleum ether into a reaction system after finish of reaction, fully performing stirring, performing suction filtration by use of a Buchner funnel to obtain magnetic chitosan microsphere particles, then fully performing stirring and washing by use of ethyl alcohol, washing with distilled water after removal of ethyl alcohol, and performing vacuum drying at 50 DEG C; performing carboxylation on the magnetic chitosan microspheres; and coupling immunomagnetic beads subjected to carboxylation with an anti-body. The preparation method has the advantages of good stability, high sensitivity and the like.

The invention discloses a preparation method of a magnetic nanometer water treatment agent for oil field sewage. The preparation method includes firstly, soaking magnetic nanometer particles of Fe3O4 with water while regulating pH to 5-7 and then carrying out ultrasonic dispersion to obtain an aqueous solution containing magnetic nanometer particles of Fe3O4; stirring the aqueous solution containing magnetic nanometer particles of Fe3O4 in a container, placing the container in constant-temperature water bath for holding temperature, gradually dropwise adding sodium oleate solution, after that, continuing to stir for 20 to 40 minutes, and cooling the solution to the temperature of 45 to 55 DEG C to obtain a mixture; finally, adding block polyether modifier solution in the mixture while stirring at the temperature of 45-55 DEG C for 0.5 to 2 hours so as to obtain the magnetic nanometer water treatment agent. The water treatment agent has the advantages such as flocculation, demulsification and easiness in magnetic separation. The water treatment agent can be recovered so that consumption of the water treatment agent is lowered and water treatment cost is reduced.

The invention relates to the technical field of water pollution control, in particular to a sewage treatment preparation and a preparation method thereof. The sewage treatment preparation is of a coreshell structure formed by using sodium oleate modified ferroferric oxides as a core and compounding a beta-cyclodextrin layer on the outer periphery of the core. Ferroferric oxides are of porous reticular structures; the pores of the ferroferric oxides is filled with modified charcoal. Ferroferric oxides in the sewage treatment preparation obtained through preparation have natural porous reticular structures of loofah; the modified charcoal can be filled, so that the large specific surface area is realized; the adsorption capability is further improved; high adsorption performance is shown; the sewage treatment preparation can be widely applied to purification treatment of industrial wastewater, domestic sewage and underground water.

The invention discloses a method for preparing magnetic lipid ultrasonic microbubble contrast medium. The method comprises the following steps: preparing FeCl3 and FeCl2 solution and adding the solutions into a flask; dripping NH4OH under stirring condition so as to generate precipitation and curing; taking out and flushing the generated product until the pH value is 7; drying generated product to obtain the Fe3O4 magnetic nano particles; preparing the Fe3O4 dry powder into magnetic fluid; discarding the supernatant, suspending precipitation again in phosphate buffer and adding PEI to form PEI / Fe3O4 nano particles; mixing the PEI / Fe3O4 nano particles with pEGFP-C1 plasmid DNA for standing to obtain gene-loaded Fe3O4 magnetic nano particles; dissolving DSPC, DPPE and DPPA in an organic solvent in which the ratio of chloroform to isopropanol is 2:1; evaporating the solvent to leave a lipid film; preparing hydration solution from glucose and propylene glycol in a ratio of 4:1 and adding the hydration solution into the flask, and dispersing the hydration solution to obtain lipid suspension; adding 40 mg of PEG4000, heating the mixed suspension for dissolving; adding DNA / PEI / Fe3O4 and gelatin into the lipid suspension; adding 800.01 ml of Tween; replacing air above a penicillin bottle; and shaking the suspension to obtain the gene-loaded magnetic lipid ultrasonic microbubbles.

The invention discloses a preparation method and application of catalytic material based on magnetic layered double hydroxides, and belongs to the technical field of catalysts. The preparation methodmainly comprises the following steps of: preparing magnetic layered double hydroxides by using magnetic silica gel particles as a core, and reacting the magnetic layered double hydroxides with silvernitrate to obtain a magnetic nano-silver catalyst. The prepared magnetic nano-silver catalyst has the characteristics of the large loading capacity, the high activity, the high catalytic efficiency and the stable structure, the prepared magnetic nano-silver catalyst can be quickly separated from mother liquor, is simple and convenient, and can be repeatedly used, and after the silver catalyst is repeatedly used for 10 times, the degradation rate of a target object is still 95% or above.

A process for preparing the superfine ultra-paramagnetic contrast medium for magnetic resonance includes such steps as dropping the ammonia solution into the mixed solution of Fe salt, ferrous salt and polyose at 4-7 deg.C under N2 protection to make pH=9.5-10 while stirring, raising its temp to 60-90 deg.C, holding the temp for 50-70 min while stirring, cooling, adding diluted hydrochloric acid to make pH=7.4-7.6, adding PBS, filtering, adding solution of glucose, and storing at 4-15 deg.C.