36results about How to "Rapid separation and enrichment" patented technology

The invention discloses a preparation method of a surface polydopamine-modified magnetic carbon nanotube, which belongs to the field of nanomaterial preparation. The steps of the method include: synthesizing magnetic nanoparticles by solvothermal method; adding magnetic nanoparticles and carbon nanotubes to ethylene glycol in a certain proportion, stirring and ultrasonically obtaining a homogeneous solution, and subjecting the solution to solvothermal reaction to obtain magnetic carbon nanotubes; and then dissolving the obtained magnetic carbon nanotubes and dopamine in a Tris-HCl buffer solution at a certain ratio, and polymerizing for a certain period of time to obtain magnetic carbon nanotubes modified with polydopamine on the surface. The product prepared by the present invention not only has the super strong mechanical properties of carbon nanotubes, but also has the characteristics of nanometer size effect of magnetic particles, better biocompatibility and magnetic responsiveness, and also has the hydrophilicity of dopamine , structural stability and characteristics as a secondary reaction platform, it can be widely used in biological fields, such as protein separation, drug delivery, biomarkers, etc.

The invention discloses a self-assembled amino acid derivative functionalized magnetic-carbon nanotube composite material and its preparation method and application. The magnetic Fe is prepared by a one-step solvothermal reduction method. 3 o 4 ‑Multi-walled carbon nanotube composites utilizing magnetic Fe 3 o 4 Hydrophobic interaction of / MWCNTs composite material, N-hexadecyl-L-hydroxyproline self-assembled on the surface of carbon nanotubes to obtain a stable complex, this material was used as a chiral adsorbent to resolve amino acid enantiomers isomers to test their chiral resolution performance. The present invention uses magnetic nanomaterials as chiral selector carriers, combined with self-assembly technology as a fixed method to prepare chiral recognition materials, which is expected to improve the stability of the chiral stationary phase and the lack of loading capacity, and realize rapid screening of chiral selectors. Efficient, high-capacity chiral separations.

The invention discloses a preparation method and application of a magnetic material for surface finish benzene sulfonic acid. The preparation method comprises the steps of adopting FeCl3 as a raw material, enabling ethylene glycol to serve as a disperse system, enabling anhydrous sodium acetate to serve as a reducing agent, and utilizing a hydrothermal method to prepare ferroferric oxide magnetic microspheres; then dispersing the ferroferric oxide magnetic microspheres into ethanol / water mixed solution, adding ammonia water and tetraethoxy-silicane, enabling tetraethoxy-silicane to undergo hydrolytic polymerization on the surfaces of the magnetic microspheres, and obtaining an core-shell magnetic material; dispersing the core-shell magnetic material to mixed solution of toluene and N,N-dimethylformamide after drying, adding 2-(4-chloride sulfonyl phenyl)-ethyl trimethoxy silane, and obtaining the magnetic material for surface finish benzene sulfonic acid by a silanization reaction. The magnetic material has rich active groups, can be dispersed stably in solution, is renewable and can be recycled. The magnetic material serves as an adsorbent, is large in surface area and strong in selectivity, weakly alkaline compounds can be adsorbed from a matrix by strong electrostatic interaction of sulfo groups and hydrophobic interaction of a benzene ring, and rapid separation and enrichment can be achieved by simple magnetic field effect.

The invention relates to a CNT (carbon nano tube) supported quaternary ammonium salt magnetic functional material as well as a preparation method and application thereof. The magnetic functional material is characterized by comprising a carboxylic CNT, a nanoscaled magnetic material coating the surface of the carboxylic CNT, an amination reagent supported on the surface of the carboxylic CNT and aquaternary ammonium salt functional reagent grafted on the amination reagent. Compared with the prior art, the magnetic functional material has the advantages that the prepared magnetic functional material can be used for removing perchlorate in water, is comparatively strong in magnetism and has comparatively high adsorption capacity and comparatively high adsorptive selectivity; and in addition, the preparation method is simple.

The invention relates to a renewable amino-functionalized magnetic carbon nanocomposite material, which is characterized in that its preparation method comprises the following steps: (1) adding ferric iron salt into ethylene glycol and ultrasonically dispersing; (2) subsequently Add anhydrous sodium acetate, then add sodium hydroxide and amino functional reagents, ultrasonically disperse until the solution is clear; (3) add carbon nanotubes to the solution in step (2), ultrasonically disperse, and then add the mixed solution to the polytetrafluoroethylene reaction in an ethylene autoclave; (4) cool the product after step (3) to room temperature, magnetically separate it, wash it with ultrapure water until the pH is 7.0, wash it several times with ethanol, and dry it in vacuum to obtain a renewable Amino-functionalized magnetic carbon nanocomposites, the present invention also provides a method for removing acidic industrial dyes in water, which can effectively realize the recycling and reuse of resources, avoid secondary pollution to water bodies to the greatest extent, and be effective in the removal of environmental pollutants. It has broad application prospects.

The invention relates to a pesticide residue detection method capable of clearing impurities through a magnetic carbon nano tube. The method comprises the steps of uniformly plating the surface of a modified carbon nano tube with magnetic particles by a chemical plating method to obtain the magnetic carbon nano tube, wherein the diameters of magnetic particles are about 10-30 nm; activating the magnetic carbon nano tube; and uniformly mixing a pesticide-containing vegetable extracting solution sample and an activated magnetic material, wherein the activated magnetic material adsorbs impurities in the vegetable extracting solution sample under the assistance of an external magnetic field. The magnetic carbon nano tube with large surface area is used as an impurity adsorbent in pesticide detection, can adsorb pigments from a complicated substrate under the mutual action of electrons and the dewatering action of the carbon nano tube and can adsorb compounds, such as organic acids and phenols, under the weak anion exchange action obtained by the fact that the surfaces of the magnetic nano particles are grafted with polymers.

The invention discloses a method for preparing a magnetic molecularly imprinted polymer for separating atrazine. The method comprises the following steps of: 1) activating Fe3O4atSiO2 particles, and performing surface modification by using a silane coupling agent to obtain composite magnetic nano-particles; and 2) adding the atrazine and methacrylic acid into an organic solvent and preassembling, adding the composite magnetic nano-particles, a crosslinking agent and an initiator, performing polymerization reaction at the temperature of between 60 and 70 DEG for 20 to 24h in an anaerobic environment, and removing the atrazine to obtain the magnetic molecularly imprinted polymer. The method is easy to operate and is suitable for large-scale production; the time consumption is low; raw materials are cheap and readily available; and membrane materials with micron-scale and nano-scale diameters can be obtained. The invention also provides the magnetic molecularly imprinted polymer prepared by the method. Magnetic molecules are firmly combined, and the magnetic molecularly imprinted polymer is high in stability and has stronger adsorption capacity when separating the atrazine.

The invention relates to the preparation of an alkylphenol (including bisphenol A, octylphenol and nonylphenol) composite template molecularly imprinted polymer and its application in the removal and analysis of alkylphenols. Graphene oxide was prepared by the improved Hummer method, and ferric oxide particles were loaded on its surface, covered with mesoporous silicon, and then double bonds were grafted. Using the obtained material as a carrier, bisphenol A, octylphenol, and nonylphenol are jointly used as template molecules, and 4-vinylbenzoic acid, ethylene glycol dimethacrylate, and 2,2'-azobisisobutyronitrile are respectively used as template molecules. Functional monomers, cross-linking agents and initiators, polymerized at 60°C. The template molecule was eluted with methanol: acetic acid (9:1, V:V) mixture, and dried in vacuum to obtain an alkylphenol composite template molecularly imprinted polymer. The material combines the specific recognition of molecular imprinting and the easy separation of magnetic materials, and can selectively adsorb bisphenol A, octylphenol, and nonylphenol in water at the same time, with adsorption capacities of 16.81, 35.97, and 61.73 mg / g, reaches adsorption equilibrium within 30 minutes, can be reused more than 5 times, and can be used for the removal and detection of alkylphenols.

The invention discloses a magnetic carbon nanotube composite material and a preparation method and an application thereof. The preparation method comprises the following steps: adding FeCl3.6H2O to an ethylene glycol solution; then adding anhydrous sodium acetate and polyethylene glycol; adding a carboxylated multiwalled carbon nanotube; performing ultrasonic dispersion; adding hexamethylenediamine or ethanediamine; heating to 200-300 DEG C for reaction for 8-24h; and washing and performing vacuum drying to prepare the amino-modified magnetic Fe3O4-carbon nanotube composite material. The amino-modified magnetic Fe3O4-carbon nanotube composite material prepared by the invention is of nanoscale and superparamagnetism, can be stably dispersed in solutions, and can be quickly separated and enriched through a simple action of a magnetic field. As an adsorbent, the material is large in superficial area and has various active groups on the surface. The material can adsorb pigments from complex substrates through pi-pi electron interaction and hydrophobic effect of the carbon nanotube and can adsorb compounds such as organic acids and phenols through weak anion exchange effect of amino groups on the surfaces of magnetic nanoparticles.

The invention belongs to the technical field of nano-magnetic materials for biology, and relates to a nano-magnetic particle, in particular to an immune nano-cellulose magnetic liposome and a preparation method thereof. It is a core-shell structure, the core is magnetic material Fe3O4, the middle layer is a mixture of liposome and nanocellulose, and the outermost layer is the antibody coated on the middle layer; the mass content of nanocellulose is 0.1%~ 50.0%, the mass content of liposome components is 0.5% ~ 90.0%, and the mass content of magnetic materials is 0.1% ~ 50.0%. The immune nanocellulose magnetic liposome of the present invention has good biocompatibility. The ligand coupling in the substance can recognize and bind to the corresponding antigen, antibody or nucleic acid, etc., and can be separated and enriched rapidly in an external magnetic field. It can be used for the detection and separation and purification of biological materials, and can be used in cell separation, immobilized enzymes, targeted drugs and Immunoassays and other biological fields have broad application prospects.

The invention discloses a preparation method for magnetic nanoparticles with surface aldehyde group functionalization. FeCl3.6H2O and anhydrous sodium acetate are dissolved in ethylene glycol, and a uniform and transparent mixed solution is prepared; The surface modification agent glutaraldehyde is added in the prepared mixed solution, after stirring and ultrasonic treatment, a uniform mixed solution is prepared; the prepared mixed solution is subjected to a solvothermal reaction in a high pressure reactor, after the reaction is over, the above mixture is cooled naturally to room temperature; In presence of an applied magnetic field, solid-state compounds are separated from the reaction products. The magnetic nanoparticles with surface aldehyde group functionalization have superparamagnetism, and can be dispersed in a solution steadily. Rapid separation and enrichment can be achieved by utilization of an applied magnetic field. The magnetic nanoparticles can be regenerated and used repeatedly, and has strong magnetism. Because of large specific surface area and surfaces with aldehyde group active groups, the magnetic nanoparticles can be used for separation of biomacromolecules and drug targeting delivery and adsorption.

The invention relates to a magnetic carbon nanotube used in the detection of pesticide residues. The chemical plating method is used to evenly plate magnetic particles on the surface of the modified carbon nanotube, and the diameter of the magnetic particle is about 10-30nm to obtain a magnetic carbon nanotube; After the carbon nanotubes are activated; the vegetable extract sample containing pesticides is mixed with the activated magnetic material evenly, and the activated magnetic material is assisted by an external magnetic field to absorb the magnetic material of the vegetable extract sample impurities. The present invention uses magnetic carbon nanotubes as impurity adsorbents in pesticide detection, the magnetic carbon nanotubes have a large surface area, and can absorb pigments from complex matrices through the electronic interaction and hydrophobic effect of carbon nanotubes, and graft the surface of magnetic nanoparticles The weak anion exchange effect of the polymer can adsorb organic acids, phenols and other compounds.