63results about How to "Well-ordered pore structure" patented technology

The invention provides a preparation method of nitrogen-doping ordered mesoporous carbon materials. According to the method, rich-hydroxyl saccharide carbohydrate is used as carbon sources, ammonia water is used as nitrogen sources, amination reaction under the hydrothermal condition is adopted for preparing rich-nitrogen precursors, mesoporous silica molecular sieves SBA-15 (space group P6mm) are used as templates, and the nitrogen-doping ordered mesoporous carbon materials in two-dimensional orthohexagonal ordered mesostructures are prepared through multi-time wetting combined with the high-temperature themolysis technology.

The present invention belongs to the field of inorganic advanced material technology, in the concrete, it relates to a kind of nano crystal large-diameter mesopore oxide material and its preparation method. Said mesopore oxide material is synthesized by using inorganic precursor and organic template agent molecules through a self-assembly process including organic solvent evaporation and induction treatment in the acidic environment, its space group structure is two-dimensional hexagonal structure, three-dimensional hexagonal structure and three-dimensional cubic structure, its pore diameter range is 1-18nm, BET specific surface area is 50-800 sq.m/g and its thermal stability is higher than 400 deg.C.

The invention belongs to the field of a composite luminescent material, and discloses a fluorescent carbon quantum dot/mesoporous alumina composite luminescent material, and a preparation method and application thereof to the oxygen sensing aspect. The composite luminescent material comprises fluorescent carbon quantum dots and mesoporous alumina used as a substrate material, wherein the fluorescent carbon quantum dots are fluorescent carbon quantum dots containing hydroxyl or amidogen, and the size is 10nm or below. The specific surface area of the mesoporous alumina is large; the pore diameter distribution is narrow, i.e., the specific surface area/pore volume rate is high; the surface has many hydroxyl; through the hydrogen bond effect, the fluorescent carbon quantum dots with hydroxyl and amidogen at the surface can be easily adsorbed; through simple experiment operation, the fluorescent carbon quantum dots with the proper pore diameter can be assembled into a pore passage of the mesoporous alumina; the fluorescent carbon quantum dot/mesoporous alumina composite luminescent material is formed. Oxygen molecules can be uniformly dispersed in the pore passage of the mesoporous alumina; an oxygen sensing material with high luminescent stability, high sensitivity and short reaction time is formed.

The invention discloses a preparation method for an iron oxide/carbon fiber composite lithium ion battery negative electrode material. The preparation method comprises the following steps: taking an iron based metal organic framework as a precursor, mixing the precursor with a PAN solution, and performing electrostatic spinning to obtain a metal organic framework/PAN fiber; and thermally treatingthe metal organic framework/PAN fiber under inert atmosphere to prepare an iron oxide/carbon fiber composite material. The iron oxide/carbon fiber composite material prepared by the preparation methodhas good toughness, conductivity, an ordered pore channel structure and a great specific surface area, is taken as a lithium ion battery negative electrode material, and has relatively high first-time discharge specific capacity, relatively high charge specific capacity, highly high first-time coulomb efficiency, relatively high circulating stability and relatively high rate performance.

The invention provides a preparation method of a mesoporous silicon dioxide hollow sphere, relates to a silicon dioxide hollow sphere, and provides a preparation method of a mesoporous silicon dioxide hollow sphere. The method comprises the steps of: adding a silicon dioxide sphere into water, and ultrasonically processing to obtain silicon dioxide sphere dispersion solution; adding a cationic surface active agent into the obtained silicon dioxide sphere dispersion solution, adding an alkali source, and etching in a stirring way; and collecting, cleaning and drying a precipitate after etching to obtain white powder, and removing the cationic surface active agent out of the white powder to obtain the mesoporous silicon dioxide hollow sphere. The silicon dioxide sphere is taken as a template, and the mesoporous silicon dioxide hollow sphere is prepared by means of carrying out alkali etching under the effect of the cationic surface active agent. The preparation method has the advantages of being strong in operability, low in cost, simple in reaction device, mild in preparation processing condition, cleaning and pollution-free in reaction processe, and high in reaction efficiency and the like. Compared with other synthesis method, the preparation method is good in industrial application prospect.

The invention discloses a shape-controlled mesoporous silica nano-material and a preparation method thereof. The preparation method comprises the steps of: firstly, taking mesoporous silica micro-nano particles as precursors, using magnesium powder as a reducing agent, controlling the heating rate at 0.1-5 DEG C/min, heating to 500-800 DEG C to carry out magnesium thermal reduction reaction for 2-12 hours, as to obtain the shape-kept mesoporous silica/magnesium oxide compound; then removing reaction product magnesium oxide and residual silica by hydrochloric acid and hydrofluoric acid solution respectively, so as to obtain corresponding shape-controlled mesoporous silica nano-material; preparing corresponding shape-controlled mesoporous silica nano-material when the mesoporous silica micro-nano particles with different shapes are adopted as the precursors; finally obtaining the mesoporous silica nano-material which has an ordered duct structure, wherein the specific surface area is 150-360m<2>/g; the aperture is 7.0-10.6nm; and the pore volume is 0.3-0.8cm<3>/g. Furthermore, the method is simple in preparation step, low in cost, and suitable for large-scale production.

The invention relates to the field of rapid detection of food safety and particularly relates to a preparation method and application of an electrochemical sensor based on a cobalt oxide/mesoporous carbon nanocomposite material and application of the electrochemical sensor in fast detection of nitrite content in a food. The preparation method of the electrochemical sensor comprises preparing a nanocomposite material carrying cobalt oxide particles and graphitized mesoporous carbon, and modifying a work electrode of the electrochemical sensor. The electrochemical sensor can detect a standard solution of nitrite, determine the linear relationship between the nitrite concentration and current, determine nitrite in the food and compare the nitrite content in the food and the linear relationship to obtain nitrite content of the food to be detected. The electrochemical sensor can determine nitrite content of a food, is easy to operate, has a fast detection rate and high detection sensitivity and provides a novel detection method for efficient and rapid detection of nitrite content in a food.

The invention discloses a mesoporous cerium zirconium solid solution composite oxide nano material and a preparation method of the mesoporous cerium zirconium solid solution composite oxide nano material. A non-ionic surface active agent is used as a template, an organic silicon source and an organic high-molecular polymer are used as organic precursors, an inorganic zirconium source and an inorganic zirconium source are used as inorganic precursors, an organic-inorganic composite is formed by an evaporating inductive multielement co-assembly method, then the organic-inorganic composite is carbonized at the temperature of 700-1100 DEG C to form the mesoporous silicon dioxide/carbon/cerium zirconium solid solution composite oxide; furthermore, the carbon is oxidized in the air at the temperature of 400-500 DEG C to form the mesoporous silicon dioxide/cerium zirconium solid solution composite oxide; and finally, the silicon dioxide template in the composite is removed by alkaline solution treatment, in this way, the large-aperture mesoporous cerium zirconium solid solution composite oxide nano material with high specific surface area and high pore volume is obtained. The mesoporous cerium zirconium solid solution composite oxide nano material can bear the high temperature of 700-1100 DEG C, the preparation method is simple and feasible, low in cost, good in repeatability, and is easy to be subjected to large-scale production.

The invention relates to a modified mesoporous silica adsorbent and a preparation method and application thereof. Under the catalysis of potassium carbonate and potassium iodide, aza-macrocyclic ligand is modified onto the surface of chlorine group functional mesoporous silica through nucleophilic substitution, and the adsorbent is prepared; palladium recycling and enrichment under different nitric acid concentrations are achieved through the adsorbent, and the selective recovery performance of palladium in highly-active effluent simulated feed liquid is evaluated. According to the modified mesoporous silica adsorbent, mesoporous nanomaterials are combined with the supermolecule recognition performance of the aza-macrocyclic ligand, the problems that selectivity is poor, operation is complex, the raw material cost is high and the stability is poor in the traditional treatment technology for palladium in highly-active effluent are solved, and the adsorbent has the advantages of being good in selectivity, large in adsorption capacity, high in adsorption speed and easy to recycle for palladium within the wide nitric acid concentration range, and has the great practical significance in the aspects of nuclear fuel reprocessing and hydrometallurgy.

The invention relates to the preparation of a Ti-MCM-41 mesoporous material with functionalized ionic liquid and an application thereof. The preparation method comprises the following steps of: adopting CTAB (Cetyltrimethyl Ammonium Bromide) as a template agent, adopting TEOS (tetraethyl orthosilicate) as silicon source, and adopting tetrabutyl titanate as a precursor; preparing solution according to mol ratio; crystallizing, filtering, washing, drying and roasting to obtain Ti-MCM-41; then coupling to obtain Ti-MCM-41-Cl; and adopting the Ti-MCM-41-Cl to react with N-methylimidazole; cooling, extracting, washing and drying to obtain the mesoporous material Ti-MCM-41-lm with functionalized ionic liquid. The preparation and the application have the following advantages: the method is simple in process; the mesoporous material Ti-MCM-41-lm with functionalized ionic liquid has orderly and uniformly distributed hole-channel structures; the surface of the mesoporous material has acid sites; and the mesoporous material is adopted as a catalyst for the reaction of epoxypropane with carbon dioxide to produce propylene carbonate.

The invention discloses a mesoporous zirconia nano material and a method for preparing the same. A non-ionic surfactant is taken as a template agent, an organic silicon source and an organic macromolecular polymer are used as organic precursors, an inorganic zirconium source is used as an inorganic precursor, a method for assembling the four components through evaporation and induction is utilized to form an organic-inorganic composite, and the organic-inorganic composite is then calcinated into a mesoporous silicon dioxide/carbon/zirconia composite at 700-1100 DEG C; the mesoporous silicon dioxide/carbon/zirconia composite is further calcinated into a mesoporous silicon dioxide/zirconia composite at 400-500 DEG C in the air; and finally, a silicon dioxide template agent in the composite is removed through aqueous alkali treatment, so the mesoporous zirconia nano material is obtained. The obtained mesoporous zirconia nano material has good pore passage ordering, high zirconia crystallization degree, the specific surface area of 195-400 m<2>/g, a pore diameter of 3-8nm and a pore volume of 0.3-1.0 cm<3>/g. The method for preparing is simple, practicable and low in cost, and has high repeatability.

The invention relates to a preparation method and catalysis application of an acidic-basic functionalized mesoporous material by using a solid-state ionic migration method. The preparation method comprises the steps of: with a mixture of Mg(NO3)2.6H2O and Al(NO3)3.9H2O, or a mixture of Mg(NO3)2.6H2O and AlCl3.6H2O, or a mixture of Mg(OH)2 and Al(OH)3, or a mixture of Mg(CH3COO)2.4H2O and Zn(NO3)2.6H2O, or a mixture of Mg(CH3COO)2.4H2O and ZnSO4.7H2O as a precursor, mixing with a mesoporous material SBA-15 prepared by using a thermal synthesis method, grinding, and calcining to prepare the acidic-basic functionalized mesoporous material, wherein the acidic-basic functionalized mesoporous material is used as a catalyst in the esterification reaction of synthesizing ethyl methyl carbonate. The invention has the advantages of simple preparation process, no need of any solvent, ordered structure and uniform distribution of holes, large specific surface area, and good thermal stability and hydrothermal stability, and realizes the function of acid-base concerted catalysis.

The invention relates to a catalyst for synthesizing phenol through direct hydroxylation of benzene and a preparation method thereof. Ammonia functionalization mesoporous silica is used as a carrier of the catalyst, and vanadiumoxy acetylacetonate is used as an active component of the catalyst. The catalyst is applied to the reaction of synthesizing the phenol through the direct hydroxylation of the benzene under the condition of hydrogen peroxide; when the reaction temperature is 50-70 DEG C, the reaction time is 4-6h, the conversion rate of benzene is 15-20%, the selectivity of phenol is 96-99%, and the yield of final phenol is 14-20%. Compared with the conventional catalyst for catalytic reaction, the catalyst has the advantages of being simple in product separation, relatively high incatalytic activity and the like.

The invention relates to a method for synthesizing a tungsten-modified alumina mesoporous material through solvent-evaporation induced self-assembly and a catalysis application thereof. The invention provides a tungste-modified WO3/Al2O3 mesoporous material through solvent-evaporation induced self-assembly with a one-step method, the prepared tungste-modified WO3/Al2O3 mesoporous material catalyst has ordered and uniformly distributed tunnel structures, the specific surface is 140-200 m<2>/g, the pore diameter is 8.6 nm-9.4 nm, the hydro-thermal stability is good, and the mesoporous material has acidity and bond breaking function. The mesoporous material can be used for preparing glycol by cellulose hydrogenolysis and conversion. The preparation method requires only one step, the process is simple, the prepared catalyst has high specific surface area of mesoporous alumina and bond breaking function of tungsten oxide, and the catalytic activity for conversing cellulose to glycol with one step is enhanced.

The present invention discloses a preparation method of an SBA-15 loaded N-doped TiO2 visible catalyst. The preparation method comprises the following steps of (1) dissolving P123 in hydrochloric acid solution, dropwise adding tetraethyl orthosilicate and stirring, thermostatically stirring up and filtrating the mixture solution; rinsing resulting precipitate until no chloride ion is present in the precipitate, and drying the precipitate to obtain SBA-15 intermediates; (2) mutually dissolving metatitanic acid, concentrated aqueous ammonia and hydrogen peroxide in an ice-water bath, sitring up the mixture solution to obtain a green yellow solution, adding the SBA-15 intermediates into the green yellow solution, so as to obtain a suspension; (3) removing the resulting suspension into a microwave reactor, so as to obtain an intermediate product; (4) filtering, scrubbing, drying and calcining the intermediate product, so as to obtain a finished product. The SBA-15 with surfactant is used as carrier, so as to effectively keep the ordered pore canal structure of the carrier, ensure high absorption capacity, and effectively prevent TiO2 from glomerating during the heat treatment process, with low manufacture cost..

The invention discloses a dust collecting device for an electric tool, and belongs to the technical field of electric machines. The dust collecting device includes a dust collecting box, a dust collecting tube connected with the air inlet of the dust collecting box, and a first filter screen arranged at one end, far from the dust collecting tube, in the dust collecting box, the periphery of the first filter screen is abutted against the inner wall of the dust collecting box, and an air outlet is arranged at one end, correspondingly provided with the first filter screen, of the dust collecting box; the periphery of the tube orifice of one end, far from the dust collecting box, of the dust collecting tube, is connected with a dust shield, and a fan is arranged at one end, far from the first dust collecting tube, in the dust shield; an alarm is arranged outside the dust collecting box, a sensor and a chamber are arranged in the dust collecting box, the sensor is arranged at the upper portion of the dust collecting box and at one side, far from the air inlet, of the dust collecting box, and a controller connected with the alarm, the sensor and the fan is arranged in the chamber; and the dust collecting box is connected with an electric tool body. The dust collecting device can effectively prevent the dust flying phenomenon in the working process of the electric tool, and also can prevent the influences of excessive dusts in the dust collecting box on the dust collecting effect.

The invention discloses a Fe-M/CNTs denitration catalyst, a preparation method and application of the catalyst in ammonia selective catalytic reduction to nitrogen oxide and belongs to the technical field of environmental catalyzed purification. The catalyst is prepared by adopting an impregnation method simple in operation and high in repeatability, namely a suitable iron source and a molybdenum source or a tungsten source are evenly impregnated on the surface of a carbon nanotube subjected to acid treatment, drying and calcination are performed, and then the denitration catalyst is obtained. The prepared Fe-M/CNTs denitration catalyst has high surface active particle dispersion, high low-medium-temperature catalytic activity and a wide operatable temperature window and has the NOx conversion rate of 90% above within the 250-400 DEG C, the N2 selectivity is kept to 85% or above, the flue gas sulfur oxide and water impact resisting capability I strong, and the Fe-M/CNTs denitration catalyst is suitable for a fixed-source nitric oxide purification device represented by coal-fired power plant flue gas and has a wide industrial application prospect.

The invention provides a preparation method for an MCM-41 loaded Pt and Al catalyst and application thereof. The method comprises the following steps: (1) preparing meso-porous silicon MCM-41, namely stirring cetyl trimethyl ammonium bromide, distilled water and concentrated ammonia water and then adding tetraethyl orthosilicate, continuously stirring for 7h and then stopping reaction, crystallizing under room temperature, filtering, washing and drying, removing cetyl trimethyl ammonium bromide, washing and roasting, thereby acquiring the meso-porous silicon MCM-41; (2) preparing the MCM-41 loaded Pt and Al catalyst, namely adding the activated meso-porous silicon MCM-41 and dehydrated ethyl alcohol into a container, introducing N2 for transition and then adding chloroplatinic acid-ethanol solution and aluminum chloride-ethanol solution, thereby acquiring the MCM-41 loaded Pt and Al catalyst. The catalyst is used for the catalytic hydrosilylation of heptamethyltrisiloxane and polyethylene glycol allyl ether. The product provided by the invention has the advantages of high stability, high reusability, high activity, convenience in recycling, low cost, and the like.

The invention discloses a preparation method of a cerium-based composite oxide low-temperature SCR catalyst taking Ce-MOF as a precursor, and belongs to the technical field of catalyst preparation. The method comprises the following specific steps: dissolving trimesic acid (BTC) into an organic solvent, adding a cerium salt solution, and stirring for 15 min at a proper temperature to obtain a Ce-MOF sample; dissolving a soluble modified metal source into ethanol, adding Ce-MOF, and stirring for 12 h at a certain temperature to obtain a precursor of a composite oxide catalyst; and roasting andgrinding the precursor, so as to obtain the CuO-CeO2 and Fe2O3-CeO2 low-temperature SCR catalyst. According to the invention, high dispersion of CuO or Fe2O3 on CeO2 is realized by utilizing the highspecific surface area, ordered pore structure and relatively strong adsorption capacity of Ce-MOF, so that the low-temperature SCR reaction catalytic activity of the composite oxide is remarkably improved.

The invention discloses a monodisperse porous hydroxyapatite microsphere, a preparation method and an application of the microsphere. The preparation method comprises the following steps of: (1) introducing a porous high polymer microsphere into water, adding alkali during stirring after uniform dispersion, regulating PH (potential of hydrogen) to be 10-11 to form a solution A, (2) introducing a calcium source and a phosphorus source into the water to form a solution B, (3) gradually dropwise adding the solution B into the solution A, continuing reaction after dropwise adding to form a solution C, (4) filtering the solution C, and performing washing and drying to form a high polymer-hydroxyapatite composite microsphere, and (5) calcining the high polymer-hydroxyapatite composite microsphere to form the porous hydroxyapatite microsphere. The hydroxyapatite microsphere is controllable and uniform in particle size and controllable in aperture, a preparation technology is simple, and a reaction condition is easy to control. The microsphere is suitable for large-scale production and can be widely applied to the fields of bioseparation, tissue engineering and the like.

The invention provides a preparation method of an efficient composite wood fire retardant, and relates to the technical field of fire retardants. The preparation method comprises the following steps:preparing mesoporous SiO2; adding mesoporous SiO2 into deionized water, and carrying out ultrasonic oscillation to prepare a suspension; adding antimony trichloride into concentrated hydrochloric acid, stirring to completely dissolve, adding the suspension in a dropwise manner, continuously stirring for 20-40 minutes after dropwise adding is finished, and filtering; leaching the solid with deionized water three times, adding into ammonia water, boiling, filtering, leaching with deionized water three times, and drying to obtain mesoporous SiO2-Sb2O3; and adding the mesoporous SiO2-Sb2O3 into azinc chloride solution, adding tin tetrachloride into absolute ethyl alcohol, stirring to dissolve the tin tetrachloride, slowly adding the tin tetrachloride into the zinc chloride solution in a dropwise, stirring for 20 to 30 min, then adding a sodium hydroxide solution, carrying out accelerating stirring for 2 to 5 h, standing for 10 to 15 h, filtering, spraying with deionized water to be neutral, then adding into oleic acid, dipping, taking out, and drying. The fire retardant disclosed by the invention is excellent in smoke suppression and flame retardant effect, and the mechanical propertyof wood can be correspondingly improved.