427 results about "Magnetic carbon" patented technology

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 present invention relates to a preparation method for a magnetic carbon-coated ferroferric oxide nano-composite material by a one-step carbonization reaction method. With the present invention, physical properties and chemical properties of the magnetic material are improved, and the application range of the nano-composite material is enlarged. The technical scheme of the present invention is that: massive FeCl3.6H2O is crushed into powder; the FeCl3.6H2O powder is placed in a beaker; then glycol is added, and a uniform stirring treatment is performed; urea and cyclodextrin powder are added to the resulting solution, and a uniform stirring treatment is performed; then the resulting mixing solution is transferred to a reaction kettle, and a reaction is performed for 6-24 hours at a temperature of 180-200 DEG C and under pressure of 0.105-0.150 MPa; finally, the mixing solution is cooled to the room temperature, treatments of sedimentation, separation and washing are performed, then a drying treatment is performed for 4-8 hours at the temperature of 80 DEG C to prepare the magnetic carbon-coated ferroferric oxide nano-composite material. According to the present invention, the preparation method is simple; the cost is low; the particle size of the product is small; the particles are the core-shell structures, wherein the Fe3O4 is the core, the carbon-coated layer is the amorphous carbon, and the surface of the carbon-coated layer contains hydroxyl groups; the material of the present invention is adopted as the catalyst carrier, and is applicable for wastewater treatments.

The invention belongs to the field of advanced nano composite materials, and relates to a magnetic polymer/carbon-based microsphere material with a core-shell structure and a preparation method thereof. The preparation method comprises the steps of: by adopting a sol-gel chemical synthesis method, in an alcohol water phase, in the presence of an alkali catalyst, wrapping polymer resin macromolecule layer outside a magnetic nano particle to obtain a magnetic macromolecule microsphere with a core-shell structure, carbonizing the polymer resin macromolecule layer through high temperature roasting to obtain a magnetic carbon-based microsphere material with the core-shell structure; adding a macromolecule surfactant during preparation, removing a surfactant by carbonizing through roasting to obtain a magnetic carbon-based microsphere material with a cavity, which is of a core-shell structure. The composite microsphere has stronger magnetic responsiveness, and the surface of the composite microsphere can be further functionalized and a large quantity of hydrophobic substances are absorbed; the magnetic microsphere material with the cavity, which is of a core-shell structure, can be used in a nano reactor, drug sustained release, and large-capacity adsorption and separation. The preparation method is simple, is easily available in raw materials, and suitable for amplified production.

The invention belonging to the nanometer material field relates to composite material made of carbon nanometer tubes enwrapped by polyaniline and ferroferric oxide and the preparation method thereof. The invention ultrasonically disperses the carbon nanometer tubes in an aqueous solution containing ferric iron ions and ferrous iron ions and obtains carbon nanometer tubes/ ferroferric oxide composite material after adding ammonia. After washing and magnetic separation, the carbon nanometer tubes/ ferroferric oxide composite material disperses in a mixed liquor containing aniline, phosphoric acid and ammonium persulfate and the composite material of the invention is obtained after agitation. After water and alcohol washing and magnetic separation, finished products are obtained through drying or dispersing in absolute ethyl alcohol. The material which has the functions of electrical conductivity, magnetism, absorption and capability of absorbing and releasing material carrying negative charge in an aqueous solution can be applicable to the fields such as enzyme immobilization, bioactive substance separation, target-oriented medicine preparation, biosensor, environmental protection, etc. The invention which has simple preparation art, low cost and high raw material utilization factor is suitable for volume production.

The invention relates to a carbon/polymer composite material in a specific direction and a preparation method. A ferroferric oxide precursor solution containing 0.05-5% by mass of iron is prepared; a thermally conductive carbon material is uniformly mixed with the ferroferric oxide precursor solution, and reaction, filtration, washing and drying are performed to obtain a magnetic carbon material with ferroferric oxide uniformly dispersed on the surface of the carbon material; the magnetic carbon material is put in a magnetic field of 0.1-1 T, the direction of the magnetic field is from an N pole to an S pole, different magnetic field directions are obtained by regulating relative positions of the N pole and the S pole, and the magnetic carbon material is arranged in the magnetic field direction; and a polymer precursor solution is poured in a directional carbon material array and cured to obtain the carbon/polymer composite material with the carbon material directionally arranged in polymer. The surface of the carbon material is loaded with ferroferric oxide, and the carbon material is directionally arranged in the magnetic field direction in the magnetic field; and the thermal conductivity coefficient of the composite material in the carbon material direction is greater than or equal to 30 W/(m.K).

The present invention belongs to the field of inorganic material technology, and is especially one kind of magnetic metal oxide microsphere in core-shell structure and its preparation process. The microsphere has ferroferric oxide microsphere as the core and metal oxide as the shell. It is prepared through the first hydrothermal process to cover one layer of amorphous carbon onto ferroferric oxide microsphere to form magnetic carbon microsphere Fe3O4@C, the subsequent dispersing microsphere Fe3O4@C in alcohol water solution of pre-hydrolyzed metal alkoxide for adsorbing inorganic oligomer to the surface of the microsphere, and the final calcining in nitrogen atmosphere to obtain the magnetic metal oxide microsphere in core-shell structure. The process is simple and practical, and has adjustable size of the microsphere. The magnetic metal oxide microsphere has important application in separating protein, separating polypeptide and other fields.

The invention relates to a method for preparing a drug carrier based on a magnetic carbon quantum dot/chitosan composite microsphere. The method specifically comprises the following steps of: (1) carrying out a coprecipitation reaction on bivalent and trivalent iron salts in an alkaline aqueous solution so as to prepare nano magnetic ferroferric oxide; (2) carrying out microwave radiation reaction on a glucose and polyethylene glycol mixed solution to prepare carbon quantum dots, and forming magnetic carbon quantum dot composite particles through electrostatic adsorption; (3) reacting the chitosan which is dissolved in a mixed solution of sodium methoxide/absolute methanol with nitric oxide in a high-pressure kettle, and forming a chitosan-nitric oxide addition product; and (4) dropwise adding the magnetic carbon quantum dots into the addition product, and forming the magnetic carbon quantum dot/chitosan composite microsphere through electrostatic adsorption. Compared with the prior art, the method is simple, rapid, low in cost, and the prepared product can be developed into the drug carrier which integrates magnetic targeting, fluorescence imaging or tracing, nitric oxide in-situ release and fluorescence detection.

The invention belongs to the technical field of composite materials, and in particular relates to a magnetic hollow multihole carbon ball with a core-shell structure and a preparation method of the magnetic hollow multihole carbon ball. the core of a core-shell type hollow micro-hole magnetic carbon ball prepared by a microwave hydrothermal method is a magnetic ferroferric oxide nano cluster; and a shell layer is multihole carbon. The preparation method comprises the following steps of: wrapping a template shell layer on the surface of ferroferric oxide by taking the ferroferric oxide nano cluster as a seed through soap-free emulsion polymerization, then wrapping the surface of a ferroferric oxide composite micro ball with phenolic resin through in-situ polymerization according to the microwave hydrothermal method, and finally carbonizing the ferroferric oxide composite micro ball at certain temperature to obtain the magnetic hollow multihole carbon ball with the core-shell structure, wherein the obtained composite carbon ball has the characteristics of uniform granularity, controllable carbon layer thickness and narrow aperture distribution. The preparation method is easy to operate, and a process is controllable; and the carbon ball and the preparation method have a good application prospect.

The invention discloses an MOF (metal organic frameworks)-based magnetic nitrogen-doped carbon nano-tube material, a method for preparing the same and application of the MOF-based magnetic nitrogen-doped carbon nano-tube material. The MOF-based magnetic nitrogen-doped carbon nano-tube material can be used as an adsorption material. MOF are calcined at the high temperatures to obtain the MOF-basedmagnetic nitrogen-doped carbon nano-tube material. Carbon nano-tubes with large quantities of free N elements are generated on the surfaces of the MOF-based magnetic nitrogen-doped carbon nano-tube material while the appearance of the MOF is reserved. The MOF-based magnetic nitrogen-doped carbon nano-tube material, the method and the application have the advantages that the MOF are used as templates for the MOF-based magnetic nitrogen-doped carbon nano-tube material which is a magnetic carbon material prepared by the aid of the method, and are directly calcined at the high temperatures to obtain the magnetic carbon material; the carbon material is high in environmental stability as compared with MOF adsorption materials, and pi-pi conjugation can be formed by the carbon material and targetobjects by the aid of strong conjugation surfaces of the carbon nano-tubes; the MOF-based magnetic nitrogen-doped carbon nano-tube material is extremely high in magnetism as compared with commercialcarbon nano-tubes, and target object detection procedures can be simplified by the aid of MSPE (magnetic solid-phase extraction) methods; processes for preparing the MOF-based magnetic nitrogen-dopedcarbon nano-tube material are simple, and the MOF-based magnetic nitrogen-doped carbon nano-tube material which is a magnetic nitrogen-doped carbon nano-material is high in magnetism and super-high inenvironmental stability, has large specific surface areas, can be specifically bound with the target objects and has an excellent application prospect in the field of detection on the content of microcystin in lake water and the like.

The invention relates to a metal-loaded magnetic carbon material catalyst and a method for catalyzing dechlorination of chlorinated phenol through the metal-loaded magnetic carbon material catalyst, and belongs to the field of organic synthesis and catalytic reaction. The metal-loaded magnetic carbon material catalyst and the method for catalyzing dechlorination of the chlorinated phenol through the catalyst are provided. The metal-loaded magnetic carbon material catalyst is a compound obtained by loading Fe3O4 and active metal elements on a carbon material, wherein the carbon material is activated carbon or carbon nano tubes or graphene, and the active metal elements are one or two of platinum, palladium and rhodium. The preparation steps of the catalyst are simple, reduction is carried out simultaneously in the preparation process of the catalyst, and the reduction step is omitted. The catalyst has terrific hydrodechlorination performance on the chlorinated phenol and is used for dechlorination of the chlorinated phenol, reaction conditions are milder, no inorganic or organic additive is added to a reaction system, and the catalyst can be recycled.

The present invention relates to a superhydrophobic magnetic carbon membrane. Its surface has net-like structure formed from spherical projection nano fibre, in which the diameter of nano fibre is 60-100 nano, the diameter of spherical projection is 20-30 nano. Said superhydrophobic magnetic carbon membrane is prepared by using electrostatic spinning technique and low-temperature carburization technique. Said superhydrophobic magnetic carbon membrane has electric conductivity, its conductivity is 0.31-5.6 s/cm. It can be used for treatment of antifouling and water-proofing surface, also can be used in sensor, nano probe, antistatic material and wave-absorbing material.

The invention discloses a magnetic carbon-based iron oxide compound material and a preparation method of the magnetic carbon-based iron oxide compound material. Particularly, the invention discloses a prepraation method of the magnetic carbon-based iron oxide compound material. The preparation method comprises the following steps of: (a) providing a mixture comprising a carbon-based precursor, elemental iron and a solvent; and (b) carrying out heating reaction on the mixture in the step (a), thus obtaining the carbon-based iron oxide compound material. The method has the advantages that materials are common and are easily available, and the process is simple, safe and effective and the like. The obtained compound material has stable magnetism, and is wide in application.

The invention belongs to the field of inorganic material and analysis technology, in particular to a magnetic carbon ball superficially modifying C8 alkyl chain, a preparing method and an application thereof. The magnetic carbon ball firstly synthesizes a nano-material of magnetic ferroferric oxide, and then synthesizes an Fe3O4 (at) carbon magnetic microsphere material characterized by a core-shell structure, and further adopts C8 to conduct the surface chemical modification to obtain the magnetic carbon ball. The fixed C1-C8 magnetic nanoparticles, as a micro-absorbent, have a large specific surface area and can be used in enriching peptide among biological samples, and the method is simple and effective. The material has a good practical value and application prospect in the field of proteomics and other fields.

The invention relates to the field of inorganic non-metallic materials and medical materials, and discloses a preparation method of a magnetic mesoporous phosphorite microsphere material. The preparation method adopts an in situ template sacrificial method with shell as a raw material, and comprises the following steps of: preparing magnetic calcium carbonate microspheres by using an in situ compounding technique first; and then treating the magnetic calcium carbonate microspheres by using phosphate buffer solution to convert the magnetic calcium carbonate microspheres into magnetic mesoporous phosphorite microspheres. The magnetic mesoporous phosphorite microspheres have the advantages of larger specific surface area, higher magnetic performance, high medicament controlled-release characteristics, magnetic performance, biocompatibility and bioactivity, and can be used in the field of magnetic targeting medicament carrier, magnetic thermotherapy, bone repair materials and the like; the shell is used as the raw material to reduce the cost; and the preparation processes are performed at low temperature and normal pressure, so the preparation method not only saves energy, but also generates no chemical substances which can pollute the environment.

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 magnetic graphene oxide composite material, belonging to carbon matrix composite materials, in particular relates to a preparation method and application of the magnetic graphene oxide composite material. The preparation method of the magnetic graphene oxide composite material comprises the following steps: dispersing graphite oxide and ferric salt into a solution for ultrasonic mixing; then adding a cross-linking agent; after filtration and washing, putting into an alkyl xanthic acid saline solution; after filtration, washing and drying to obtain the material. The magnetic graphene oxide composite material is used for removing heavy metal ions and/or organic pollutant in the water. In conclusion, the preparation method provided by the invention is simple, safe and environment-friendly, is low in price and adopts easily available raw materials, and is easy to carry out industrial production. The prepared composite material has high adsorption efficiency on heavy metal ions and organic pollutant in water and strong capacity of resisting disturbance, can carry out multicomponent adsorption at the same time, is high in recycle utilization rate and is suitable for industrialization popularization and application.

The invention belongs to the technical field of environmental new functional nano materials, in particular relates to a preparation method of a novel magnetically separable absorbent for removing dye, comprising the following concrete steps of: ultrasonically dispersing a primary carbon nano tube sample in distilled water by adopting a chemical vapor deposition method; adding a certain quantity of oxidizing solution, and placing the solution in a magnetic stirrer for refluxing at a certain temperature for several hours; and filtering the modified magnetic carbon nano tube sample, washing with water, and vacuum drying to obtain a magnetic carbon nano tube composite absorbent. In the magnetic carbon nano tube composite absorbent obtained in the invention, the outer layer of a metal catalyst particle used for magnetically separating is coated with a carbon layer with better graphitization, which is used for effectively protecting the metal catalyst particle so that the service life of a catalyst is prolonged, meanwhile, the composite absorbent can be stably used under an acidic condition. The invention has the advantages of simple preparation process, easiness in condition control and stable property; the structural structure of the carbon nano tube is modified by adopting the oxidizing solution, thus, the hydrophobicity of the carbon nano tube is improved, and the dispersion property of the carbon nano tube in the solution is improved; and the absorbent can be rapidly and conveniently separated and recycled by adopting a magnetic separating technology, therefore, secondary pollution to the environment is avoided.

The invention relates to a method for preparing a carbon nanometer tube loaded type catalyst. The preparing method disclosed by the invention comprises the following steps of: (1) functionalizing a carbon nanometer tube; (2) depositing magnetic nanometer particles on the surface of the functionalized carbon nanometer tube to obtain a magnetic carbon nanometer tube; and (3) depositing an active metal element on the surface of the magnetic carbon nanometer tube to obtain a metal loaded type magnetic catalyst. Compared with the conventional preparation method of the carbon nanometer tube catalyst, the preparation method of the carbon nanometer tube loaded type catalyst, disclosed by the invention, has the characteristics of simple preparation process, adjustable particle diameter of the magnetic nanometer particles and the catalyst particles and the like. The catalyst prepared by the method disclosed by the invention has excellent catalytic performance; and efficient separation and recycling of the catalyst and a liquid phase catalyst system can be realized by the control of an external magnetic field, and the production cost and the use cost can be reduced, so that the method has application prospect in the hydrogenation and dehydrogenation reaction.

The invention relates to a preparation method of a magnetic carbon nanotube surface molecular imprinting material. The preparation method comprises three steps of magnetic carbon nanotube preparation, surface molecular imprinting reaction and template molecule elution. The preparation method has simple processes and can be controlled easily. The magnetic carbon nanotube surface molecular imprinting material obtained by the preparation method has a specific recognition function, excellent magnetic properties, high mechanical strength, a high adsorption capacity and fast binding dynamical properties, can be used as an ideal adsorbent or a coating material used in various solid-phase extraction technologies, can also be used for preparation of molecularly imprinted sensors and chips, and has an important meaning for studying specific recognition and high-sensitivity detection on quinolone drugs.

The invention relates to a preparation method of a chloramphenicol molecular imprinted adsorbing material on the surface of a magnetic carbon microsphere. The magnetic carbon microsphere is prepared from shaddock peel by adopting a solvent thermal synthesis method, the surface of the magnetic carbon microsphere is subjected to ethylene functional modification by KH570, the treated magnetic carbon microsphere is used as a matrix material, chloramphenicol is used as a template, hydroxyethyl methylacrylate and 4-vinylpyridine are used as functional monomers, N-isopropyl acrylamide is used as a thermosensitive monomer, ethylene glycol dimethacrylate and N,N-methylene bisacrylamide are used as cross-linking agents, 2,2'-azobis[2-methylpropionamidine] dihydrochloride is used as an initiator, and the magnetic carbon microsphere surface imprinted thermosensitive adsorbing material is prepared in a methanol/water mixed system, and the adsorbing material is used for selective recognition and selective separation of chloramphenicol in a water environment. The prepared molecular imprinted adsorbing material on the surface of the magnetic carbon microsphere is low in cost, can be prepared easily, has the high recognition and selectivity properties, high separation and enrichment ability and high adsorption rate of target molecules, and is high in adsorption speed.

The invention relates to FeCo alloy/CuO double-plating magnetic carbon fiber and a preparation method and application. FeCo alloy and Cu plating are successively electroplated on the surface of the pretreated continuous carbon fiber by use of the traditional electroplating means, CuO plating is formed after thermal oxidation, and columnar CuO with diameter of about 100 nm is formed on the surface. The electromagnetic parameters of the carbon fiber are improved through the alloy/oxide double-plating; the modified magnetic carbon fiber has high-frequency and high-strength microwave absorption performance, and has microwave loss of less than -10 dB at the frequency band from 2-18 GHz; and when the frequency is 9.6 GHz, the composite material with thickness of only 1.6 mm shows the maximum microwave absorption valve of -47.56 dB. The magnetic carbon fiber provided by the invention has uniform and dense magnetic double-plating, is simple in preparation process, high in production efficiency and excellent in microwave absorption performance, and can be used as a novel low-density microwave absorption material.

The invention discloses a high-performance magnetic carbon-based composite nanofiber microwave absorbent and a preparation method thereof. Composite nanofibers are prepared by electrostatic spinning and a post heat treatment one-step method; the mean diameters of the composite nanofibers are 150-500 nm; generated Fe nanoparticles are relatively uniformly distributed in or on the surfaces of the carbon nanofibers, and are wrapped by a graphitized carbon layer; and the absorbent has better oxidation resistance and corrosion resistance. The density of a wave absorption coating prepared by compositing with silica gel is only 0.8-1.0g/cm<3>; when the thickness of the coating is 1.2-2.0mm, the minimum reflection loss of the absorbent reaches -35dB to -75dB; the effective absorption band width with the reflection loss less than -10dB at 2-18GHz reaches 10.2GHz; a whole Ku wave band and an X wave band are covered; and the absorbent has the advantages of light mass, broadband, strong absorption, convenient adjustment of electromagnetic parameters, and the like.

The invention relates to a method for preparing magnetic carbon nanotube/crosslinked chitosan composite nanomaterial adsorbent. According to the invention, a carbon nanotube original sample is adopted as a raw material; the magnetic performance of metal catalyst particles residual in the carbon nanotube original sample and the high-efficiency selective adsorption performance of the carbon nanotube are fully utilized; the adsorption performance of the material is significantly improved through compositing with biological material chitosan; therefore, the magnetic composite nanomaterial adsorbent with high efficiency in adsorbing dye in water phase is obtained. The magnetic composite nanomaterial adsorbent obtained in the invention has the advantages that: the carbon nanotube has no need to adopt strong acid treatment so that the structural integrity of the carbon nanotube is protected; the magnetic performance of the metal catalyst particles residual in the original sample is utilized so that additional process is not needed for composition of magnetic particles; moreover, the crosslinked chitosan has good biocompatibility to benefit the toxicity reduction of nanomaterial and potential biological application; and the obtained nano composite adsorbent can be conveniently and rapidly separated and recycled by adopting magnetic separation technology, so that secondary environmental pollution is avoided.

The invention discloses a preparation method of a 2-mercaptopyridine modified magnetic carbon nanotube porous adsorbent. The preparation method is characterized by comprising the following steps of firstly, oxidizing a carbon nanotube; magnetizing, so as to obtain a magnetic carbon nanotube porous material; aminating the magnetic carbon nanotube porous material, so as to obtain the aminated magnetic carbon nanotube porous material; adding 78 to 85% of tetrahydrofuran, 1 to 4% of 2-mercaptopyridine and 8 to 16% of aminated magnetic carbon nanotube porous material into a reactor in percentage by mass, stirring, dripping 1.5 to 5.5% of fumaryl chloride, stirring at constant temperature of 85+/-2 DEG C, stirring, and refluxing to react for 5h; cooling, washing by deionized water to neutral state, separating solid and liquid, and drying, so as to obtain the 2-mercaptopyridine modified magnetic carbon nanotube porous adsorbent. The 2-mercaptopyridine modified magnetic carbon nanotube porous adsorbent has the advantages that the adsorbing capacity on silver is high, the selective adsorbing capacity on silver is high, the cost is low, the mechanical strength is low, the adsorbent can be repeatedly used for not less than 10 times, and the separation is easy.