131results about How to "Rich in mesopores" patented technology

The invention discloses a multi-metal MOFs derived oxygen reduction/oxygen evolution double-function catalytic material, and a preparation method thereof. The preparation method comprises following steps: room temperature coprecipitation is adopted to synthesis a Zn/Co/Fe multi-metal ZIF precursor; then sulfuration and sintering treatment technology is adopted for combination of oxygen reduction reaction (ORR) active sites (Co/Fe-N-C) and oxygen evolution reaction (OER) active sites (Co/Fe-S) on a monomer material, so that the double ORR/OER electrocatalyst which is low in cost and possesses the performance as good as that of commercially available catalysts is obtained. According to the preparation method, two important factors, including active site distribution and catalytic mechanism,with great influences on material performance are taken into comprehensive consideration, realization of the optimal material catalytic oxidation reduction/oxygen evolution reaction efficiency is taken as a design principle, optimization design is adopted to obtain the best Zn/Co/Fe ratio in the precursor, and the catalyst is provided with the best catalytic performance. The multi-metal MOFs derived oxygen reduction/oxygen evolution double-function catalytic material possesses both high efficiency oxygen reduction and oxygen evolution performance, is high in specific surface area, is abundantin micropores, and is uniform in active site dispersion; and the cost is much lower than that of commercially available precious metal catalyst catalytic materials.

The invention provides a defluorinating adsorbent for drinking water, which is a composite metal oxide defluorinating adsorbent and a high polymer material playing a role of adhering absorbent particles. Absorbent powder and a high polymer binder are mixed, extruded, cut and dried to prepare into particles. The defluorinating adsorbent has the characteristics of good ion selectivity, high adsorption capacity, better strength in both dry and wet states, and no crushing or dissolving after being used for a long time.

The invention provides an arsenic-removing adsorbent for drinking water and a preparation method thereof. The adsorbent contains composite metal oxide and a polymer material binder. The arsenic-removing adsorbent has high adsorption property, high adsorption selectivity on arsenic in the drinking water, and high adsorption capacity; adsorbent particles have high strength in a dry state or in a moist state, and the adsorbent has low breakage rate of the particles and cannot be dissolved out during use; and the adsorbent is used under the conditions of long time and larger change of waterflow pressure.

The invention relates to the technical field of water treatment, and concretely relates to a catalytic ozonation catalyst as well as a preparation method and application thereof. The preparation method of the catalytic ozonation catalyst comprises the following steps of grinding raw material coal, adding active components, forming, carbonizing and activating to obtain the catalytic ozonation catalyst. The active components are prepared from one or more of a transition metal compound, a rare earth metal compound, an alkali metal compound and an alkaline-earth metal compound. According to the preparation method, an activation reaction mechanism is changed, so that a pore structure of the catalyst is changed, and a double-pore distribution structure with coexistence of mesopores and micropores is prepared; the catalyst has high catalytic activity, and the removal rate of COD (Chemical Oxygen Demand) can be greatly improved; the catalyst is developed in mesopores, larger in pore volume, and beneficial to enabling pollutants to enter pores of the catalyst so as to fully contact with an active center; the micropores exist at the same time, so that the catalytic activity can be effectively improved.

The invention provides an arsenic removal adsorbent and a preparation method thereof. The adsorbent contains sulfate akaganeite and high-molecular material agglomerant. In the invention, the particles of the arsenic removal adsorbent have high adsorption property to have high adsorption selectivity to arsenic in drinking water, the adsorption capacity is high, the adsorbed particles have large strength under a drying state or a moisture state, the particle crushing rate is low during use, no adsorbent is dissolved out, and the arsenic removal adsorbent is suitable for being used for a long time and under the condition of larger water flow pressure change.

The present invention belongs to the technical field of nano material preparation, in particular to a stratum porous gamma-alumina and the preparation method of the stratum porous gamma-alumina. The present invention selects a cheap and easily acquired natural plant gegen as a template which is pre-treated by nitric acid and then soaked by alchlor solution, smoked and dipped by ammonia and roasted by high temperature to acquire the stratum porous gamma-alumina similar to the pore canal structure of the gegen. The preparation method has the advantages of no surfactant, easy preparation technics, low cost and high purity of the alumina prepared. Compared with the traditional gamma-alumina, the stratum porous gamma-alumina prepared by the present invention not only has abundant meso-pores, but also has abundant big pores, larger specific surface area and pore capability as well as good pore structure and thermal stability. As a carrier, the present invention has important values on the aspects of catalyzing, absorption, nano reactor, template and optical control device.

The invention relates to an adsorbent for removing inflammatory factors in blood of a patient with inflammatory reaction on the whole body through blood or plasma perfusion and a preparation method thereof. The adsorbent is a nano composite structure adsorbent, is a cell factor adsorbent prepared by using nano calcium carbonate-styrene-divinylbenzene as a basic framework, using toluene, gasoline and a multi-carbon alcohol mixture as pore-foaming agents and using benzoyl peroxide as an initiator and has a developed mesoporous structure and high specific surface area. By introducing the nano material, the efficiency of removing the inflammatory factors in blood or blood plasma of the adsorbent is greatly improved. The adsorbent is simple to prepare, has the efficient removal effect on inflammation factors such as IL-6, TNF-alpha, IL-beta 1 and IL-8 and is used for removing the excessive pathogenic inflammatory factors in the patient body in a blood or blood plasma perfusion mode.

The invention relates to a preparation method of a porous graphene active carbon material as well as a product and application thereof, and belongs to the technical field of materials. The method comprises the following steps: pretreating a biomass material with an oxidant and weak acid or salt under a condition of hydrothermal assistance to realize stripping and pore forming of the biomass material, and then performing high-temperature pyrolysis to convert the biomass material into a carbon material. The method is easy to operate; the finally prepared carbon material is high in graphitizationdegree, and also has the characteristics of high specific surface area, rich mesoporous and micropore porosity, unique layered structure and heteroatomic doping. The material is applied to a supercapacitor; an electrochemical test result shows that compared with a common active carbon material for the supercapacitor, the material has the advantages that the capacity is 4.5 times that of the common active carbon material; the material is widely applied to the fields of energy storage and conversion, electric catalysis, biosensing, environmental purification and the like, and has an important application value.

The invention provides a boron/nitrogen double-doped porous carbon nanosheet and a lithium-sulfur battery positive electrode material thereof. According to the technical scheme, urea, boric acid and polyethylene glycol serve as raw materials, the boron/nitrogen double-doped porous carbon nanosheet is prepared through high-temperature carbonization, and the prepared boron/nitrogen double-doped porous carbon nanosheet is of a graphene-like two-dimensional sheet structure and has a high specific surface area and rich micropores and mesopores; on the basis, the boron/nitrogen double-doped porous carbon nanosheet is used as a carrier, and the positive electrode materials with different sulfur contents are prepared by a melt diffusion method. In the lithium-sulfur battery positive electrode material provided in the invention, the unique two-dimensional structure of the boron/nitrogen double-doped porous carbon nanosheet is beneficial to promoting rapid transfer of electrons and relieving volume expansion of a sulfur electrode, and boron/nitrogen doped atoms have a relatively strong Lewis acid-base effect on lithium polysulfide, so that the shuttle effect of the electrode can be effectively inhibited, and relatively high specific capacity and excellent cycle performance are shown.

The invention discloses a solvent-free method of preparing a Co-MOF material based on a cobalt-containing double metal oxide. The method comprises the following steps of: grinding and mixing the cobalt-containing double metal oxide with a ligand compound; putting the mixture in a sealing kettle; and performing a reaction at 80-300 DEG C in the sealing kettle to obtain the Co-MOF material which is large in specific surface and has mesopores and micropores at the same time. The method is simple to operate, short in period and high in yield, provides a novel MOF material preparation path, and greatly lowers the production cost of the MOF material, so that industrial production is facilitated.

The invention relates to a catalyst and method for preparing 1, 6-hexanediol by hydrogenation of dialkyl 1, 6-adipate. The catalyst comprises, by weight, a) 20 to 50 parts of metallic copper or an oxide thereof, b) 30 to 60 parts of metal zinc or an oxide thereof, c) 1 to 20 parts of at least one transition metal or its oxide, and d) 1 to 20 parts of alumina. The desired alumina precursor has a specific surface area of 50 to 500m<2>/g and a total pore volume of 0.3 to 2.0ml/g. The volume of pores having diameters less than 20nm is 40-80% total pore volume. The volume of pores having diameters of 20-90nm is 10-40% total pore volume. The volume of pores having diameters greater than 90nm is 0-16% total pore volume. The catalyst can be used in the industrial production of 1, 6-hexanediol by hydrogenation of dialkyl 1, 6-adipate.

The invention discloses a preparation method of an exposed [200] crystal face monocrystal square OMS-2 nano material. The method comprises the following steps: dropwisely adding 0.02 mmol of aldehyde substance into 0.02 mmol of potassium permanganate solution according to the mole ratio of 1:1, continuing stirring for 12-24 hours after finishing the dropwise addition, carrying out vacuum filtration, washing with water, washing with anhydrous ethanol, and roasting the obtained product in a muffle furnace at 500-600 DEG C for 4-6 hours, thereby obtaining the exposed [200] crystal face monocrystal square OMS-2 nano material. The method has the advantages of simple equipment, low cost, no environmental pollution and mild reaction conditions, and can easily implement large-scale production. The prepared catalyst material has low-temperature activity for o-xylene, and can completely convert the o-xylene into CO2 and H2O at 200-230 DEG C. The material has important application values in the fields of adsorption, catalysis, molecular sieves, electrode materials and the like.

The invention discloses a method for preparing N-doped porous carbon/ferric oxide compound powder. The method includes the steps of preparing coal-based polyaniline composites through in-situ polymerization, uniformly mixing ferric citrate with hot water to obtain a ferric citrate solution, adding the coal-based polyaniline composites in the ferric citrate solution, mixing, subjecting the result to vacuum thermal treatment to obtain paste, pyrolyzing the paste, and cooling the pyrolyzed paste to obtain the N-doped porous carbon/ferric oxide compound powder. The N doping amount in the N-doped porous carbon/ferric oxide compound powder is 0.122wt%-0.258wt%, the N-doped porous carbon has rich mesopores and macropores, and ferric oxide exist in the state of micro-nano spheres. When the N-doped porous carbon/ferric oxide compound powder is used as active electrode material to prepare a N-doped porous carbon/ferric oxide electrode material, the single electrode specific capacitance of the N-doped porous carbon/ferric oxide electrode material reaches 279.5F/g under the constant current density of 2.0A/g.

The invention discloses an MOFs derived three-dimensional hierarchical pore Co/NC composite material and a preparation method thereof. The method comprises the following steps of: adding an organic ligand solution into a metal salt solution, stirring, centrifuging and drying to obtain a ZnCo-ZIF material; adding the ZnCo-ZIF material into water, then adding a starch suspension, heating and stirring, and carrying out rotary evaporation to obtain a ZnCo-ZIF/ST material; and calcining the ZnCo-ZIF/ST material to obtain the three-dimensional hierarchical pore Co/NC material. Bimetal MOFs are usedas precursors, the three-dimensional hierarchical pore Co/NC material is prepared through a starch limited pyrolysis method, and compared with a traditional template method and an activation method, the method is easy and convenient to operate, safe and environmentally friendly; and meanwhile, due to the introduction of low-boiling-point Zn, the agglomeration of Co nanoparticles at high temperature is reduced, and the material shows excellent catalytic performance in the oxidative esterification reaction of 5-hydroxymethylfurfural and has a good application prospect.

The invention provides a preparation method of a mesoporous carbon material. The mesoporous carbon material is composed of amorphous carbon and has a concentratedly distributed mesoporous channel system; and the pore size is in a range of 7 to 9 nm. The carbon material is prepared by the following steps: at first, mixing calcium carbonate and ethanol, then adding distilled water, carbohydrates, and silica sol, evenly mixing, then carrying out an ultrasonic treatment, drying, carrying out a high temperature treatment in an atmosphere of nitrogen gas, finally reacting the material with an acid solution and an alkali solution, washing, and drying to obtain the carbon material. The provided preparation method has the advantages that no pricy organic additive is used, the operation is simple and easy to perform, and the production cost is low.

The invention discloses a preparation method of a polymer matrix controllable graded pore material. The polymer matrix controllable graded pore material is prepared by combining a colloidal crystal template method with a pore-forming agent; in the process of synthesizing the graded pore copolymer, the final specific surface area and a pore structure of the control material are realized by properlycontrolling the proportions of a monomer, a crosslinking agent and the pore-forming agent. The polymer matrix graded pore material obtained by the invention selects a three-dimensional ordered macroporous copolymer as a skeleton; the pore wall is enabled to have a microporous and mesoporous structure by regulating the content ratio of all the components in a precursor, and thereby the graded porematerial is prepared. The average aperture variation range of the graded pore material is 4 to 8.5 nm, and the variation range of specific surface area is 100 to 700m<2>/g. According to the graded pore structure of combining three-dimensional ordered large holes with micropores and mesopores, the ordered macropores greatly improve the mass transfer efficiency of a material; abundant micropores and mesopores favorably improve the specific surface area and the utilization rate of the material, so that the material has a great potential application value in practical application.

The invention discloses a method for preparing a graphite-like phase carbon nitride coated [alpha]-Fe2O3 material, comprising the steps of: uniformly stirring and mixing an iron salt and a graphite-like phase carbon nitride precursor in water, dispersing ultrasonically the mixture to obtain a precursor solution; sintering the precursor solution, washing the sintered precursor solution with waterto neutrality, and drying the product to obtain a graphite-like phase carbon nitride-coated [alpha]-Fe2O3 material. The invention also discloses a graphite-like phase carbon nitride coated [alpha]-Fe2O3 material, which is prepared by using the preparation method. The invention also discloses the application of the graphite-like phase carbon nitride coated [alpha]-Fe2O3 material in preparing battery electrodes, supercapacitors and electric vehicles. The method realizes the uniform coating of graphite phase carbon nitride. The graphite phase carbon nitride on the surface of [alpha]-Fe2O3 effectively improves the conductivity and the stability of [alpha]-Fe2O3. The graphite phase carbon nitride and the [alpha]-Fe2O3 have a synergistic effect.

The invention provides a preparation method of a multi-layer macropore-mesopore-micropore polymer-derived ceramic adsorption material. The preparation method comprises the following steps: preparing solid polysiloxane; grinding and screening wood chips and rice husks, performing ball milling, and taking out and drying powder; performing ball milling on solid polysiloxane, wood powder and rice huskpowder uniformly after mixing; placing a uniform mixture in a tubular furnace, sintering the mixture at high temperature under the protection of inert gas, and performing heat preservation and cooling with the furnace; performing acid etching on the obtained porous SiOC ceramic powder with a hydrofluoric acid solution, washing a product with water to be neutral and then performing drying to obtain the macropore-mesopore-micropore polymer-derived ceramic adsorption material. Multi-layer porous polymer-derived ceramic with high specific surface area can be synthesized by in-situ reaction and has abundant micropores and mesopores, and larger storage space and evacuation channels can be formed; rapid transport rate of reactants and products in the sewage treatment process is increased as a result of enough large pores, and larger adsorption space and transport channels can be formed.

The invention relates to the field of novel catalytic materials, specifically to a preparation method for an Fe-N-C catalyst with waste shaddock peel as a carbon source. The preparation method comprises the following steps: S1, smashing the shaddock peel, and carrying out pretreatment so as to obtain dried shaddock peel; adding the dried shaddock peel and iron salt into deionized water, and carrying out stirring, drying and grinding so as to obtain mixed powder; and S2, calcining the mixed powder obtained in the step S1 in an ammonia gas atmosphere, and after completion of calcination, carrying out acid treatment so as to obtain the Fe-N-C catalyst. The method provided by the invention does not need to use a high-cost carbon material as a precursor, uses the shaddock peel as the carbon source, forms the Fe-N-C catalyst and pyrolyzes the shaddock peel into a mesoporous carbon material at the same time, and is a method for in-situ generation of a carbon carrier; the waste shaddock peel realizes cyclic utilization; and the Fe-N-C catalyst obtained by using the preparation method provided by the invention has the advantages of large specific surface area, high porosity, a large numberof mesopores, high purity and more excellent oxygen-reduction electrocatalytic performance.

The invention belongs to the field of material chemistry and relates to a preparation method of a positive electrode functional separator applied to a lithium sulfur battery. The method uses polyacrylonitrile and silica as precursors, and an electrostatic spinning process for preparing continuous nanofiber membranes. The electrostatic spinning PAN film is carbonized, and subjected to hydrofluoricacid treatment and activation to obtain a positive electrode functional barrier layer, which can make up a defect of poor performance of the lithium sulfur battery due to low utilization rate of active material in the positive electrode material caused by the polysulfide shuttle effect in the lithium sulfur battery in the prior art.