86results about How to "Easy magnetic separation" patented technology

The present invention discloses a functionalized silicon coating mesoporous magnetic carrier. The carrier is a compound magnetic carrier having a core-shell structure formed by coating the magnetic ferroferric oxide with the silicon dioxide and an active amido or mercapto is bonded on the surface of the magnetic carrier and the active amido or mercapto can apply the selective chemisorption effect to the target chemical. The present invention simultaneously discloses a preparation method for the carrier, which in particular is that the thickness and uniformity of the silicon film are increased through two times of silicon coating processes so as to effectively protect the magnetic carrier from being corroded by acid and base in the application; the template agent on the surface of the carrier is detracted with high temperature under the inert atmosphere and the porecreating processing is applied to the surface of the carrier so as to increase the effective surface area of the carrier and enhance the processing performance. The fixed active bacterium for the funtionalized silicon coating mesoporous magnetic carrier can be applied in the treatment of the urban domestic sewage delivers good treatment effect and has important meaning to the environment protection.

The invention relates to a magnetic nano cerium dioxide ozone catalyst, which comprises nano ferroferric oxide core, an silica interface layer wrapped the nano ferroferric oxide core and a cerium dioxide active ingredient loaded on the silica interface layer; in the magnetic nano cerium dioxide ozone catalyst, the mass ratio of ferroferric oxide to silica to cerium dioxide is 1: 0.3-0.8: 3-5. The invention also discloses a preparation method and an application of the cerium dioxide ozone catalyst in the process of ozone catalysis and organic waste water degradation. The magnetic nano cerium dioxide ozone catalyst can rapidly degrade the organic pollutant in waste water, and is easy to magnetically recovery, and the magnetic nano cerium dioxide ozone catalyst has good continuous usability and low metal ion leaching rate, and provides a rapid and effective processing method for enhancing ozone technology, removing organic waste water pollutant and industrial application.

The invention belongs to the technical fields of environmental protection and comprehensive utilization of resources, and particularly relates to a biomass liquefaction residue activation method for recycling a biomass hydrothermal liquefaction residue and application of the biomass liquefaction residue. The specific process comprises the following steps: (1) activating a biomass liquefaction residue with acid or alkali to generate activated carbon particles; (2) performing in-situ synthesis on the activated carbon particles to generate magnetic particles, wherein the magnetic carbon material has high specific surface area, high pore volume and high magnetic intensity, and can be magnetically separated from a water solution; and (3) removing organic dye pollutants in wastewater with the magnetic carbon material. The invention has important promotion action on development of the biomass industry. The preparation method has the advantages of low energy consumption, environment friendliness, mild conditions, simple process, high adsorption capacity for dye organic pollutants, no secondary pollution and the like.

The invention discloses a copper doped composite magnetic nano-material and preparation and an application of the copper doped composite magnetic nano-material, and belongs to the fields of magnetic particle synthesis and water treatment research. Aiming at a solvent thermal synthesis process of magnetic nanoparticles, according to the invention, copper chloride and ferric chloride are taken as metal salt precursors, based on solvent thermal reaction, and through copper doping ratio adjustment, the obtained mesoporous Cu-Fe3O4 microspheres have controllable particle size (560nm-120nm), specific surface area (40-100m2 g-1) and surface charge amount, and have the characteristics of high monodispersity, uniform size, high magnetic property (130-65emu g-1) and the like, and show excellent adsorption and regenerative adsorption properties for pentavalent arsenic and trivalent arsenic in a water body. The mesoporous Cu-Fe3O4 microspheres are simple in preparation process, low in cost and high in arsenic adsorption property, can be quickly magnetically separated, and has a good application prospect.

A magnetic MFe2O4 / C / M' compound and a preparation method thereof using aniline small organic molecules as a carbon source is characterized in that magnetic nano particles of MFe2O4 are in the center, the middle layer is a carbon layer produced by carbonization of the aniline small organic molecules, a thickness of the middle layer is 1-50 nanometers, the outer layer is M' precious metal, and a thickness of the outer layer is 1-100 nanometers. Preparation processes include the following steps: the first step: preparing the magnetic nanometer particles; the second step: preparing magnetic MFeO4 / C compound nanometer materials; the third step: preparing magnetic precious metal shell MFe2O4 / C / M' compound nanometer particle materials, wherein M in the MFe2O4 is Ferrum (Fe), Cobalt (Co), Manganese (Mn), Nickel (Ni), Zinc (Zn), and Copper (Cu) element, or combination of two above elements; and the precious metal M' is Gold (Au), Platinum (Pt), Copper (Cu), and Palladium (Pd) metal or combination of two above metals. Through coverage of the carbon (C) layer, the surfaces of the magnetic nanometer particles carry amidogen perssads so as to be beneficial for further conduct decoration of metal nanometer particles. And surface area of the compound materials is enlarged so as to be beneficial for absorption of organic molecules. The materials have potential application value in environmental, biomedicine and catalysis aspects.

The invention relates to a preparation method and application of a modified Fe3O4@MOF composite material, belonging to the technical field of material preparation. According to the invention, super-paramagnetic ferriferrous oxide nanoparticles are prepared by using a solvothermal method; a layer-upon-layer self-assembly method is utilized for deposition of metal central ions and organic ligand on the surface of super-paramagnetic ferriferrous oxide used as a core so as to realize in-situ synthesis of a Fe3O4@MOF composite material; and the Fe3O4@MOF composite material is subjected to surface modification so as to obtain the modified Fe3O4@MOF composite material. The modified Fe3O4@MOF composite material is applicable to adsorption of heavy metal mercury ions in industrial waste water.

The invention provides a broad-spectrum high-efficiency antibacterial nano iron sulfide mixture capable of inhibiting and killing multiple bacteria and fungi as well as a preparation method and application of the nano iron sulfide mixture. The preparation method of the antibacterial nano iron sulfide mixture comprises the following steps: adding a sulfur source in the process of preparing nano ferroferric oxide particles by a solvothermal method, wherein the step of preparing the nano ferroferric oxide particles by a hydrothermal method or the solvothermal method comprises a sub-step of utilizing an iron source, an aqueous or non-aqueous solvent and an alkaline solution as a reactant. The nano iron sulfide mixture disclosed by the invention is excellent in dispersion property, easy to prepare, easy in magnetic separation, stable in performance, excellent in biocompatibility and long in antibacterial effect period, is harmless to the human body during conventional use, environment-friendly, eco-friendly, easy to control and low in price, and thus is a high-efficiency low-degree broad-spectrum antibacterial material.

The invention discloses a method for degrading organic wastewater through heterogeneous ultraviolet catalytic oxidation. The method comprises the following steps of firstly preparing manganese ferrite by adopting a chemical co-precipitation method; sequentially adding the manganese ferrite, organic wastewater and hydrogen peroxide to an organic wastewater treatment device; and finally opening an ultraviolet source of the organic wastewater treatment device for radiation treatment of the organic wastewater. Through common action of ultraviolet Fenton reaction, the manganese ferrite and the hydrogen peroxide, the advantages of the ultraviolet Fenton reaction, the manganese ferrite and the hydrogen peroxide are fully developed to obtain a good organic wastewater treatment effect; H2O2 is catalyzed by using ultraviolet light and the manganese ferrite to degrade 50mg / L of 1.2.4-acid-simulated dye wastewater, so that the degradation rate can reach 85.93%; and representation is carried out by virtue of an X-ray diffractometer, and the result shows that the crystal structure of the manganese ferrite is free of an obvious difference before and after wastewater degradation, and the effect of catalytically degrading 1.2.4-acid by the manganese ferrite is free of an obvious change after being used for multiple times.

The invention discloses a ferrocene-methylene blue double-labelled magnetic sphere nano-composite for detecting miRNA and a preparation method of the magnetic sphere nano-composite. The magnetic sphere nano-composite contains the following components: a magnetic sphere nanogold composite, hairpin DNA probes, ferrocene modified nanogold, methylene blue modified nanogold and miRNA, wherein miRNA is complementary with annular parts of the hairpin DNA probes. The preparation method comprises the steps of firstly preparing the magnetic sphere nanogold composite, fixing the two hairpin DNA probes to the surface of the magnetic sphere nanogold composite, carrying out miRNA hybridization, and fixing the ferrocene modified nanogold and the methylene blue modified nanogold. The magnetic sphere nano-composite provided by the invention has the advantages of simplicity in preparation, strong electrochemical responsiveness, high detection sensitivity and the like.

The invention provides a preparation method of a magnetic heteropoly acid-graphene composite catalytic material and belongs to the field of chemical catalytic materials.Ferrous sulfate, sodium hydroxide, polyvinylpyrrolidone and urea are mixed with a graphene solution, and hydrothermal reaction is performed to obtain a magnetic carrier material; the magnetic carrier material is dissolved in distilled water under ultrasonic conditions, then hexadecyl trimethyl ammonium bromide and a heteropoly acid material are added, magnetic separation is performed to obtain a solid after mixing, and washing and drying are performed to obtain themagnetic heteropoly acid composite catalytic material. The method is simple, the raw materials are easy to obtain, the prepared material isuniform in magnetic particle morphology and uniform in distribution, and the magnetic carrier has a larger specific surface area.

The invention relates to a preparation method and application of a magnetic MOF composite and belongs to the technical field of material preparation. The preparation method comprises the following steps: preparing superparamagnetic ferroferric oxide nanoparticles by adopting a solvent thermal process, taking superparamagnetic ferroferric oxide as a core, coating a silicon dioxide shell on the surface of ferroferric oxide by adopting a hydrolysis method, so that Fe3O4@SiO2 nanoparticles are obtained, dissolving ferric trichloride hexahydrate and terephthalic acid into methylene formamide (DMF) to obtain DMF mixed liquor, then adding the Fe3O4@SiO2 nanoparticles and the DMF mixed liquor into a reaction kettle, and reacting, so that the magnetic MOF composite is obtained. The magnetic MOF composite can be used for adsorption of organic dye methylene blue.

The invention discloses a preparation method of a sulfonic acid group modified super-paramagnetic nano material, and belongs to the field of material preparation and industrial wastewater treatment. The method comprises the following steps: preparing super-paramagnetic ferroferric oxide nanoparticles by using a coprecipitation method; by taking super-paramagnetic ferroferric oxide as a core, coating mono-dispersed spherical silicon dioxide nanoparticles on the surface of ferroferric oxide by using a stOber method; on the basis of coupling reaction principle, modifying on the core coated by silicon dioxide; and by taking 2-(4-sulfonyl chloride phenyl) ethyl trimethoxy silane as a modification reagent, modifying on a core-shell structure so as to connect the sulfonic acid group. The adsorbent is used for selectively adsorbing the heavy metal copper in sewage, is high in adsorption rate and can be repeatedly used.

The invention discloses a superparamagnetism composite microsphere with hepatitis C NS3 monoclonal antibody and a preparation process thereof, and relates to the diagnosis reagent technology, in particular to a reagent for external diagnosis of magnetic immunity and a process for detecting ultramicro hepatitis C NS3 antigen in blood serum. The invention synthesizes a superparamagnetism immune microsphere whose surface is coupled with a hepatitis C NS3 monoclonal antibody by utilizing an avidin-biotin system and adopting the superparamagnetism microsphere as a carrier, then reacts the superparamagnetism immune microsphere with hepatitis C NS3 antigen in detected blood serum and hepatitis C NS 3 monoclonal antibody of enzyme label under constant temperature, operates the magnetic separation, and measures after scouring. The invention is a novel immunoreaction multistage amplifying system for detecting hepatitis C NS3 antigen, has less detection steps, can be finished the detection within one hour, has simple operation, low cost, simple requirement to experiments, high sensitiveness and detection concentration of p g / ml, and is suitable for being widely used in our country.

The invention discloses a synthesis method of a magnetic phosphorus adsorbent based on lanthanum loaded fly ash beads, belonging to the fields of resource recycling and environmental protection. The synthesis method is characterized by comprising the following steps: carrying out multi-step magnetic separation and ball milling on fly ash to obtain strong magnetic micro-beads of which the average particle size is less than or equal to 5mu m, and coating a layer of silicon oxide on the surfaces of the strong magnetic micro-beads; and then putting the silicon-coated micro-beads in a lanthanum chloride solution, dropwise adding an alkali solution until the pH value is greater than 10, and cleaning and baking to obtain lanthanum loaded fly ash beads, namely the magnetic phosphorus adsorbent. The adsorption capacity of saturated phosphorus of the magnetic phosphorus adsorbent prepared by the method can reach 18.36mg / g, and after adsorbing phosphorus, the adsorbent can realize efficient magnetic separation through a magnetic separation method; and the method disclosed by the invention can realize environment-friendly efficient preparation of the magnetic phosphorus adsorbent, is simple in synthesis process, and is suitable for industrial production after improvement.

The invention provides a magnetic biochar composite material preparation method based on microalgae. The preparation method at least includes the steps: firstly, adding microalgae and water in a hydrothermal reaction kettle to prepare a microalgae suspension; then successively adding an iron salt, an organic acid and a catalyst in the microalgae suspension, sealing, and then introducing a protective gas to displace air in the reaction kettle; placing in an oven, and carbonizing, to prepare a magnetic biochar composite material having the advantages of stable structure, controllable morphology, stronger magnetism and easy magnetic separation and having the surface rich in carboxyl functional groups. Compared with the prior art, by adding a small amount of the organic acid and the catalyst, the hydrothermal 'one-step method' is carried out to achieve primary biomass green preparation of the Fe3O4 magnetic biochar composite material, and the method is simple to operate, economic, efficient, and friendly to the environment, and has a relatively great potential application value.

This invention relates to a preparation method for magnetic fluid characterizing in selecting FeCl3 and ferrous sulfate as the source, taking ammonia as the precipitator and adding small amount of hydrazine hydrate to react for a period of time under normal temperature to prepare a product to be filtered, washed and dried and added into a Mn2+, Zn2+ and Fe3+ solution with the concentration of 0.1-0.5mol / L to be bathed and heated in oil and added with NaOH solution to be reacted and aged for 2-3 days, pH value is adjusted and washed with deionized water to neutral to be dried to become a nm compound powder with soft and hard magnetism, which is mixed with a surface modifier and a solvent to be reacted for 4-9h, then reacted under acid and alkali conditions with glucan aldehyde to be recovered with reducer to get magnetic nm compound particles wrapped with glucan aldehyde to get magnetic fluid of high stability by dispersing the particles and surfactant in water.

The invention discloses a preparation method of a Fe3O4@ZnO@N-C composite photocatalysis material. The preparation method comprises the steps of taking Fe3O4 magnetic nanoparticle in a controllable submicron size as a carrier, preparing a Fe3O4@ZnO composite catalyst, depositing a metal organic framework material ZIF-8 on an outer layer of Fe3O4@ZnO by a complexing effect between Zn2+ and di-methylimidazole to prepare a Fe3O4@ZnO@ZIF-8 composite with a multiple core-shell structure, and converting ZIF-8 into ZnO and nitrogen doped carbon through a heat treatment technology. The prepared composite has good photocatalytic degradation performance and stable recycling performance; a recovery rate is increased; and the composition of a photo-induced electron-hole pair is reduced. The prepared composite can be used for degrading organic pollutants in sewage and increasing photocatalytic degradation efficiency and a recycling rate.

The invention discloses a surface amination nanometer ferroferric oxide adsorbent and a preparation method thereof. The method comprises the following steps: preparing magnetic nano ferroferric oxide by adopting a coprecipitation method, coating the surface of the nano ferroferric oxide with a SiO2 shell layer by adopting a sol-gel method by taking tetraethoxysilane as a silicon source, and preparing the surface amination nanometer ferroferric oxide adsorbent by taking 3-Aminopropyltriethoxysilane (APTES) as a coupling agent. The grain diameter of the adsorbent is 80-100nm; the grain diameter of the nano ferroferric oxide is 10-20nm. The surface amination nanometer ferroferric oxide adsorbent is high in adsorptive property, easy to separate and recover, simple in preparation method, and low in cost.

A magnetic chemical absorbent according to the present invention is provided with a composite, which is constituted of a core substance comprising magnetite fine particles and schwertmannite being precipitated around the core substance to chemically bond therewith. This magnetic chemical absorbent can be produced in a hydrolysis reaction step, in which crystal of schwertmannite is precipitated by means of hydrolysis reaction by heating a solution of ferric salt and thereafter adding a reactive substance thereto, by means of adding magnetite fine particles into the solution after the solution is heated and before the precipitation of the crystal begins. This magnetic chemical absorbent is novel and good one whose absorption capability for harmful ion is upgraded more. In accordance with a waste-liquid treating method using this magnetic chemical substance, it is possible to intend the reduction of burdens in view of environmental and economic aspects. Moreover, this magnetic chemical absorbent is recyclable.

The invention relates to a targeting fluorescent-magnetic nano-material as well as a preparation method and an application thereof. The preparation method comprises steps of preparation of Zn0.4Fe2.6O4 NPs, preparation of a carbon quantum dot and preparation of RGERPPR PEG DSPE covered Zn0.4Fe2.6O4 NPs and CQDs. The material has the characteristics of being good in malignant tumor targeting property, stable in performance, good in biocompatibility and being relatively strong in both fluorescent and magnetic saturation values. The novel targeting fluorescent-magnetic multifunctional nano-material prepared by the invention simultaneously reserves advantages of a fluorescent material and a magnetic material, and the nano-material has relatively good performances of magnetic separation, magnetic resonance imaging, fluorescent imaging and the like.

The invention relates a novel magnetic chelating resin with a high specific area. The magnetic chelating resin is mainly prepared by the following steps that 1, magnetic nanoparticles are prepared bya co-precipitation method, and oleic acid, vinyltriethoxysilane, and methacryloxy propyl trimethoxyl silane are sequentially used for modifying the surfaces of the magnetic nanoparticles; 2, a temperature-raising procedure is strictly controlled, so that suspension polymerization of the modified magnetic nanoparticles, divinylbenzene and methyl acrylate is performed; 3, post-crosslinking and a grouping reaction of the resin are performed. The magnetic chelating resin prepared has high specific saturation magnetization and higher specific area and group content, and can have a good removal effect on a compound pollution system in which organic matters and heavy metals coexist and have an excellent application prospect.

The invention discloses a preparation method of a double-shell phosphonyl modified silica magnetic microsphere for extracting uranium from brine. An inner shell of the double-shell phosphonyl modified silica magnetic microsphere is a compact silica layer and is used for coating a magnetic substance Fe3O4 in a core, so that dissolution of Fe3O4 during a using process is avoided; an outer shell of the double-shell phosphonyl modified silica magnetic microsphere is a phosphonyl modified silica layer having a developed and ordered mesoporous structure, so that the uranium can conveniently enter a hole for adsorption. The preparation method of the double-shell phosphonyl modified silica magnetic microsphere comprises the following steps: firstly coating the compact silica layer on the surfaces of magnetic Fe3O4 nanoparticles, then further coating a porous phosphonyl functionalized silica layer, and finally removing a template agent (P123) through reflux extraction, thus obtaining the double-shell phosphonyl modified silica magnetic microsphere. The double-shell phosphonyl modified silica magnetic microsphere disclosed by the invention can be used as an adsorbent, and can be used for realizing high-efficiency uranium extraction from the brine through adsorption by taking salt making brine in sea salt production as a raw material.

The invention discloses a preparation method and application of a modified superparamagnetic Fe3O4 nanoparticle, belonging to the field of treatment of industrial wastewater. The method comprises the following steps of preparing the superparamagnetic Fe3O4 nanoparticle by adopting a coprecipitation method; by taking superparamagnetic Fe3O4 as a core, coating the surface of Fe3O4 with one or more layers of silica shells by adopting hydrolysis; modifying coated silica by applying a coupled reaction principle; by taking 3-aminopropyl trimethoxysilane as a modification reagent, modifying on a core-shell structure and connecting to an amino group; finally, using chloromethyl thiirane to synthesize a chelate which simultaneously contains nitrogen and sulfur by a nucleophilic substitution reaction; then using the chelate to adsorb heavy metal mercury, and in particular to selectively adsorb Hg<2+> at normal temperature, wherein the adsorption efficiency of the chelate is significantly higher than that of a chelate which is previously synthesized and only contains a sulfur ligating atom. The modified superparamagnetic Fe3O4 nanoparticle has the advantage of easiness in recovery and regeneration.

The invention discloses a preparation method and application of a modified superparamagnetic Fe3O4 nanoparticle, belonging to the field of treatment of industrial wastewater. The method comprises the following steps of preparing the superparamagnetic Fe3O4 nanoparticle by adopting a coprecipitation method; by taking superparamagnetic Fe3O4 as a core, coating the surface of Fe3O4 with one or more layers of silica shells by adopting hydrolysis; modifying coated silica by applying a coupled reaction principle; by taking iminodiacetic acid as a modification reagent, modifying by adopting a nucleophilic reaction to obtain the modified superparamagnetic Fe3O4 nanoparticle; then using the superparamagnetic Fe3O4 nanoparticle to adsorb heavy metal chromium, and in particular to selectively adsorb Cr<6+> at normal temperature. The modified superparamagnetic Fe3O4 nanoparticle has the advantage of high adsorption efficiency.

The invention discloses a method for preparing an antibacterial material of Ag magnetic carbon microspheres, relating to a preparation method of Ag magnetic carbon microspheres and aiming at solving the problems that the existing antibacterial material is low in antibacterial property and poor in recycling performance. The method comprises the following steps: I, preparing Fe3O4 magnetic fluid; II, evenly mixing glucose and the Fe3O4 magnetic fluid; III, preparing Ag magnetic carbon microspheres by adopting a reducing method; V, performing the antibacterial property experiments of the Ag magnetic carbon microspheres by selecting E.coli and B.sub as experimental objects. The antibacterial property of the antibacterial material of the Ag magnetic carbon microspheres is improved by 30% compared with the existing antibacterial material, and the antibacterial material of Ag magnetic carbon microspheres is simple in technology, even in Ag distribution, less in usage amount, less in environmental pollution and low in cost, and easily realizes commercialization. The method is applied in the field of preparation of the Ag magnetic carbon microspheres.

The invention provides a magnetic combined crosslinked enzyme aggregate biocatalyst. The biocatalyst can produce diffraction peaks at diffraction angles 2 theta of 30.5+ / -0.2 degrees, 35.4+ / -0.2 degrees, 44.7+ / -0.2 degrees, 57.3+ / -0.2 degrees and 63.4+ / -0.2 degrees. A preparation method of the biocatalyst is simple, does not need special equipment, needs mild process conditions, is easy to operate, realizes a low cost and is suitable for industrialization. The biocatalyst is used for asymmetric synthesis of (R)-3-quinuclidinol, realizes synchronous carbonyl reduction and coenzyme NADH / NAD<+> in-situ regeneration, prevents diffusional limitation to a substrate , a coenzyme and a product, has good catalytic activity and high catalytic efficiency, greatly shortens reaction time and has obvious economic values.

The invention discloses a method for adsorbing heavy metals through a Fe3O4 / CD (cyclodextrin)-G-PANI (polyaniline) composite. The method comprises steps as follows: step one, a suspension of the Fe3O4 / CD-G-PANI composite and a NaNO3 solution are mixed in advance and pre-balanced for 24 h, and then, heavy metal ion wastewater is added; step two, a trace of a HNO3 or NaOH solution is dropwise added to the mixed solution; step three, the mixture is stirred mechanically for 24 h, so that the adsorption reaction is in a balanced state; step four, solid and liquid separation is performed; step five, solid parts are repeatedly leached until no Cu or Zn is detected in a leachate; step six, remaining Fe3O4 / CD-G-PANI colloids are collected and put in an oven, the next round of adsorption / desorption operation is performed after drying, and the process is performed eight times to realize repeated utilization. The method is low in cost, environment-friendly and high in repeated utilization rate and also has high purification efficiency for Cu-containing and Zn-containing urban sewage.

The invention discloses a method for treating high-salt organic wastewater by activating peroxymonosulfate with magnetic copper oxide, belonging to the technical field of water pollution control. In this method, a magnetic copper oxide catalyst, which is synthesized simply in one step, is used to activate peroxymonosulfate to produce singlet oxygen with strong oxidizability as the active oxidationspecies, so as to remove refractory organic matter from high-salinity organic wastewater. Compared with the peroxymonosulfate water treatment technology which produces sulfate radical and hydroxyl radical, the singlet oxygen produced by this method is less easily affected by inorganic salts in water, the catalyst activity is stronger, and it is more beneficial to the treatment of saline organic wastewater. The method is applicable to the treatment of various saline organic wastewater, can efficiently remove organic pollutants in a wide pH range, has the simply prepared catalyst, convenient operation, low price and easy magnetic separation, and has great application potential in the field of saline organic wastewater treatment.

The invention discloses a preparing method for magnetic materials and application thereof, and belongs to the field of material preparing and catalyzing. According to the method, ferroferric oxide Nano particles are prepared through a solvothermal method, wherein ferroferric oxide is used as the core part, and spherical Silicon dioxide Nano particles with the characteristic of monodispersity are used to cover the surface of the ferroferric oxide. Through the principle of coupled reaction, chlorosulfonic acid is adopted as a modification reagent to carry out modification on the core part which is covered with the silicon dioxide. The chlorosulfonic acid carries out modification on the core structure so that the modified core structure can be connected to Sulfonyl and then used for selectively adsorbing Fe 3+. After all the processes, the target product is finally obtained. The prepared magnetic materials can be used as the catalyst for synthesis of isoamyl acetate, and has the advantages of high catalytic activity, good reusability, and non-corrosion to apparatus. Besides, the magnetic materials can be easy to recycle and reuse as the catalyst.

The invention provides a preparation method of a magnetic nanoparticle modified activated sludge adsorbing agent. Activated sludge is adopted as a raw material, and is magnetized by prepared nanoscale Fe3O4. The method which firstly adopts the magnetic activated sludge as the adsorbing agent is simple and easy to implement, low in cost and large in adsorption capacity, heavy metals in water can be effectively processed, the resource utilization of the activated sludge is realized, magnetic separation can be carried out easily, the convenience in recovery is realized, and secondary pollution cannot be caused during an adsorption process.