48results about How to "Fast magnetic separation" patented technology

The invention provides a method for preparing lysozyme molecular imprinting nano particles with magnetic responsiveness and extremely high adsorption capacity. In the method, lysozymes are used as template molecules. The method comprises the following steps of: carrying out template polymerization under the conditions that suitable functional monomers, a cross-linking agent and an initiator and magnetic nano particles the surfaces which are coated with SiO2 and are modified by sulfydryl and acryloyloxy exist; and washing out the template molecules to obtain the lysozyme molecular imprinting nano particles with magnetic responsiveness and high adsorption capacity. The invention also provides a method for preparing the nano particles. The lysozyme molecular imprinting nano particles prepared by adopting the method disclosed by the invention have the characteristics of high adsorption capacity, simpleness for preparation, low cost, strong specific absorption, high physical, chemical stability, capability of being recycled repeatedly and the like.

The invention relates to a preparation method of a hydrophilic magnetic halloysite surface molecularly-imprinted nano composite material and belongs to the technical field of preparation of an environment functional material. Magnetic halloysite is synthesized by an impregnation method and a high temperature reducing method, and magnetic nano particles have a uniform size and are uniformly distributed; an initiator is grafted to the surface of the magnetic halloysite by the surface amination and amidation reaction and a molecularly-imprinted polymerization layer grafted to the surface of the magnetic halloysite is controlled in the nanoscale by surface atom transfer radical polymerization; due to existence of a tail-end ATRP (atom transfer radical polymerization) active group, the hydrophilic magnetic halloysite surface molecularly-imprinted nano composite material is successfully grafted with a hydrophilic polymer brush, is successfully applied to high-efficiency selective removal and rapid magnetic separation of sulfamethazine in the water environment and has excellent regenerability.

The invention discloses magnetic composite hydroxyapatite nanoparticles. The magnetic composite hydroxyapatite nanoparticles are composed of Fe3O4 nanoparticles and hydroxyapatite nanoparticles, wherein the molar ratio of the Fe3O4 to the hydroxyapatite is (1-10): 1; the magnetic composite hydroxyapatite nanoparticles are spherical aggregate or agglomerate in which the Fe3O4 nanoparticles and the hydroxyapatite nanoparticles are distributed evenly and alternately. The preparation method of the magnetic composite hydroxyapatite nanoparticles is simple; the nanoparticles are capable of efficiently removing heavy metal ions in sewage, and in the later treatment period, quick magnetic separation can be realized; the nanoparticles have the adsorbing capacity of 440mg/g to lead ions, the adsorbing capacity of 238mg/g to cadmium ions, the adsorbing capacity of 139mg/g to zinc ions and the adsorbing capacity of 135mg/g to copper ions in the sewage; the magnetic composite hydroxyapatite nanoparticles have a rapid magnetic response characteristic, and are capable of realizing rapid solid-liquid separation with an external magnetic field, and the separation process is high in separation efficiency, and simple and efficient to operate; and besides, the nanoparticles are not residual in water and do not cause secondary pollution to the water and the environment.

The invention discloses a molecular bottle brush type reverse phase adsorbent and a preparation method thereof. The molecular bottle brush type reverse phase adsorbing material is obtained by taking hydroxyethyl methacrylate containing an ethylenic bond and styrene as monomers and sequentially polymerizing on the surface of dopamine-coated magnetic graphene through an atom transfer radical polymerization (ATRP) method. A separating material disclosed by the invention has the characteristics of high adsorption capacity and long service life, and can be used for enriching and quantitatively analyzing bisphenol A in environmental water, so that the separating and enriching efficiency of the bisphenol A can be greatly improved.

The invention relates to a device and a method for reducing hematite-containing materials by utilizing microwave heat treatment and carrying out magnetic separation. The device comprises a material bin, a screw feeder, a star type feeding machine, a preheating reacting furnace and a microwave magnetic separator. When the magnetic separation is carried out, the materials are crushed and then added to the material bin, powdery materials enter the preheating reacting furnace through the screw feeder and the star type feeding machine for preheating, and the preheated powdery materials enter the microwave magnetic separator through an air inlet pipe for the microwave heat treatment and the magnetic separation; products subjected to the magnetic separation are discharged through an ore discharge pipe from a discharge port, and other materials are discharged through an outlet pipe from the discharge port. The device disclosed by the invention can be used for reducing the weak magnetic Fe2O3 contained in the materials into strong magnetic Fe3O4 through the microwave heating and separating the iron ore concentrates through the magnetic separation, integrally and simultaneously carries out the reduction and the magnetic separation, has the advantages of small investment, low energy consumption, large treatment quantity, water saving, no air pollution, wide application range and relatively popularization prospect, is simple in equipment, and can be used for treating multiple hematite-containing materials which include ores, such as steel slag, low-grade limonite and iron ores.

The invention provides a magnetic layered double hydroxide-metal organic framework composite material as well as a preparation method and application thereof, belonging to the technical field of composite materials. The structure of the magnetic layered double hydroxide-metal organic framework composite material is Fe3O4@ZnAl-LDH/ZIF-8. The preparation method comprises the following steps: preparing Fe3O4@ZnAl-LDH by adopting a coprecipitation method, and generating ZIF in situ on the surface of Fe3O4@ZnAlLDH by adopting a solvothermal method to prepare the Fe3O4@ZnAl-LDH/ZIF-8 composite material. The magnetic layered double hydroxide metal-organic framework composite material is applied to the field of micro-extraction, so rapid magnetic separation can be achieved, the magnetic layered double hydroxide metal-organic framework composite material can be recycled, extraction time is shortened, and experiment cost is reduced. Meanwhile, through hybrid ZIF-8, the specific surface area of ZnAl-LDH is increased, and the extraction efficiency of ZnAl-LDH on a target compound is greatly improved. The composite material can sensitively, simply, conveniently and quickly detect target components, can meet analysis requirements on EDCs in milk samples, and also shows good application potential in the aspect of trace organic pollutant analysis and determination.

The invention discloses a method for detecting ofloxacin in milk by combination of magnetic solid-phase microextraction and carbon quantum dot fluorescence sensibilization. According to the method, polyethylenimine is utilized as a carbon source and a nitrogen source, and nitrogen doped fluorescent carbon quantum dots are synthesized by a hydrothermal method; ferroferric oxide magnetic nano particles modified by 2-(5-bromine-pyridine azo)-5-diethylamino phenol and lauryl sodium sulfate are utilized as a milk purifying material, the ofloxacin can enhance fluorescence of the nitrogen doped fluorescent carbon quantum dots, the strength of a fluorescent signal enhanced by the ofloxacin and the concentration of the ofloxacin have a certain linear relation, and a fluorescence spectrophotometry for detecting the ofloxacin can be established based on the certain linear relation. The nitrogen doped fluorescent carbon quantum dots prepared by the method disclosed by the invention have a remarkable fluorescence sensibilization effect and strong selectivity; the magnetic nano particles have a better purifying effect and can eliminate matrix interference; the method can be applied to fluorescence measurement of the ofloxacin and has the characteristics of high flexibility and specificity.

The invention discloses a special RO-phase magnetic separator for steel slag micro powder. The special RO-phase magnetic separator comprises a separation cavity, an RO-phase collecting cavity and a magnetic bar component, wherein the RO-phase collecting cavity is formed in one side of the separation cavity and is a half-sealed cavity; an RO-phase discharge hole is formed in the lower part of the RO-phase collecting cavity; a plurality of groups of windows are arranged between the RO-phase collecting cavity and the separation cavity; the magnetic bar component penetrates through the windows, spans between the two cavities and is used for communicating the two cavities; the magnetic bar component structurally comprises a cylinder, a magnetic system shaft, a magnetic block, a chain wheel and a bearing. When the equipment is additionally arranged on an air tube, the RO-phase in the steel slag micro powder can be effectively adsorbed and separated, and the content of inert substances in the steel slag micro powder after RO-phase separation can be reduced to within 15% from about 35% at present.

The invention relates to a method for detecting CTCs by multi-antibody immunomagnetic bead enrichment. The method comprises specific steps as follows: 1, coupling an anti-EpCAM monoclonal antibody with magnetic beads; 2 preparing a circulating tumor cell sample: adding a proper quantity of immunomagnetic beads to a biological tumor cell sample, performing uniform mixing, then, performing separation by a magnetic separator and PBS cleaning, suspending magnetic bead adsorbed cells in a PBS for cell counting, and detecting enriched cells by a cell counting plate; adding a proper quantity of nanoimmunomagnetic beads to an artificial tumor cell blood sample for magnetic separation, performing PBS cleaning, and then, suspending magnetic bead adsorbed cells in the PBS again; taking the sample, dropwise adding the sample to a glass slide, performing incubation by FICT, detecting enriched cells by a flow cytometer, and identifying effectiveness by tumor cell-fluorescence labeling EPCAM. Counting is performed under a fluorescence inverted microscope, and enrichment and identification of tumor cell line cells mixed with peripheral blood are the same as above. The sensitivity and specificityof circulating tumor cell detection are greatly improved.

The invention discloses a preparation method of monodisperse magnetic polystyrene microspheres, microspheres prepared by the preparation method and application of the microspheres. The preparation method comprises the following steps that: seed microspheres are prepared by a solution polymerization method; porous crosslinked polystyrene microspheres are prepared by swelling polymerization; nitro porous crosslinked polystyrene microspheres are prepared under acidic conditions; finally, through an in-situ reaction, the microspheres in the previous step is mixed with inorganic salt with ferrous ions, an initiator and ammonia water for reaction, and performing centrifugal cleaning to obtain the monodisperse magnetic polystyrene microspheres. In the preparation process, the usage amount of an organic reagent and the amount of wastes are less than those in the prior art; and the prepared magnetic polystyrene microspheres have the advantages of monodispersity, low sedimentation rate, high magnetic separation speed and mild separation conditions.

The invention relates to the field of catalyst preparation, and discloses a magnetic core-shell hydrogenation catalyst and a method for preparing 2, 2, 4, 4-tetramethyl-1,3-cyclobutanediol, the catalyst is represented as Fe3O4 (at) S/M; wherein Fe3O4 is a core layer, S is a shell layer carrier, and M is a main active metal and/or an auxiliary metal loaded on the shell layer carrier; the active metal is one or more of Ru, Ni, Ir, Pd and Pt, and the loading capacity is 1-50 wt% of the catalyst; wherein the auxiliary metal is one or more of Cu, Fe, Co, Zn and Sn, and the molar ratio of the auxiliary metal to the main active metal is 0.1-10: 1. The catalyst has the following advantages: 1, the hydrogenation speed is high; (2) the catalyst has high conversion rate on raw materials and high selectivity on target products; (3) strong magnetism is achieved, rapid magnetic separation can be achieved, and filtering separation is not needed;.

The invention relates to a functional magnetic material for selective separation of pepsase, wherein the functional magnetic material is prepared by the following preparation steps: preparing ferroferric oxide particles, namely preparing silicon dioxide-coated ferroferric oxide particles by using tetraethoxysilane as a silicon source; adding functional monomers containing glycosyl and positive charges into an aqueous solution, freely polymerizing with allyl triethoxysilane in the presence of an initiator, introducing nitrogen into the mixed solution to remove oxygen, and carrying out a reaction at normal temperature; after the polymerization is finished, adding ferroferric oxide coated with silicon dioxide, and carrying out a reaction in a water bath; and washing the obtained material withdistilled water, and drying to obtain the material. The functional magnetic material disclosed by the invention is good in biocompatibility and good in dispersity; the material has the advantages ofuniform particle size, strong adsorption performance on pepsase, stable performance, realization of repeated use, repeated use for at least six times, realization of the separation of pepsase after the material is placed in a room temperature dry environment for half a year, great saving of the use production cost, and wide application prospect.