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

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 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 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.

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 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 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.