129results about How to "Many surface active sites" patented technology

The invention relates to a lanthanum-modified nickel-copper octanol hydrorefining catalyst, preparation and application thereof. The catalyst is prepared by taking Gamma-Al2O3 as a carrier, taking lanthanum as an auxiliary agent, taking nickel-copper as a active component and adopting an immersion method; and the aluminum oxide accounts for 40-90%in the terms of 100% by mass, the content of nickel is 1-40% in the terms of NiO, the content of copper is 1-30% in the terms of CuO, and the lanthanum as the auxiliary agent is 0.1-10% in the terms of La2O3; and a hydrogenation evaluation result indicates that the catalyst is reduced at a temperature of 350-550 DEG C, and under the conditions that the reaction temperature is 120 DEG C, the reaction pressure is 2.5MPa, the volume ratio of hydrogen to liquid is 8:1 and the volume air speed is 3.0h<-1>, the hydrogenation rates of unsaturated substances such as octylene aldehyde, isooctyl aldehyde and octylene alcohol are all more than 95%.

The invention provides an electrochemical sensor detection method of trac heavy metal ions, and relates to a sulfydryl functionalized graphene modified glassy carbon electrode, and preparation and application of the electrode, and belongs to the technical field of heavy metal detection and electrochemical analysis. The method specifically comprises the following steps: modifying sulfydryl functionalized graphene on the surface of the glassy carbon electrode so as to manufacture a sensor, and detecting the trace heavy metal ions by using an electrochemical differential pulse stripping voltammetry method. The method can be directly applied to rapid electrochemical detection on the heavy metal ions, and has the advantages of high sensitivity, wide linearity range, low detection limit and the like.

The present invention discloses a composite catalyst for denitration and demercuration. The composite catalyst comprises, by mass, 30-40% of TiO2, 57-68% of chitosan, and 2-3% of an assistant catalyst, wherein the assistant catalyst is one or a combination selected from CuO, MnO2 and CeO2. The catalyst preparation method comprises: (1) adding 57-68 parts by mass of chitosan to an acetic acid solution, and stirring to completely dissolve; (2) adding 30-40 parts by mass of TiO2 and 2-3 parts by mass of an assistant catalyst to the chitosan acetic acid solution, adopting a NaOH solution to adjust the pH value to 9-12, and adopting magnetic stirring and ultrasonic dispersion to uniformly mix; and (3) adopting an autoclave to carry out a hydrothermal synthesis reaction, and carrying out centrifugation washing and vacuum drying to obtain the catalyst. The catalyst of the present invention can be applied for the denitration and demercuration reaction, and has characteristics of high catalysis efficiency, strong anti-SO2 toxicity, low raw material cost and regeneration use.

The invention discloses a porous g-C3N4 (graphene-carbon nitride) photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps of using melamine and acetaldehyde as raw materials, using acetaldehyde to modify a precursor of the melamine, and roasting for two times under different environments, so as to obtain the g-C3N4 photocatalyst.The prepared g-C3N4 photocatalyst has the advantages that the surface area is large, and the porosity is high; by adopting the porous structure, the energy conversion efficiency is improved, the specific surface area of a semiconductor is increased, more surface active sites are provided, and the photocatalysis activity is improved; moreover, by adopting the nanometer pore wall structure, the transmission distance between photo-induced electron cavities is reduced, the separating efficiency of photo-induced electrons and cavities is improved, the compounding rate is reduced, and the photocatalysis activity under the visible light is greatly improved. The preparation method has the advantages that the cost is low, and the operation is convenient; the harmful matters of isopropanol and the like can be degraded under the condition of radiation by the visible light, and the important practical application value is realized in the fields of environment purification and production of clean energy.

The invention discloses a graphene cement base material capable of adsorbing heavy metal ions and a preparation method of the graphene cement base material, belonging to the technical field of composite materials. Used raw materials are functionalized graphene, cement, sand and water. The preparation method comprises the steps of adding the weighed functionalized graphene into the water, ultrasonically treating for 30min, adding the cement and the sand into a stirring pot, and stirring; then performing die-filling forming and maintaining to obtain a formed finished product of the graphene cement base material. The graphene cement base material has high capability of adsorbing the heavy metal ions in polluted water, can be used in places such as drainage pipelines, channels, artificial river-bed bottoms and sewage settling tanks, can be recycled, and is green and environment-friendly.

The invention discloses a VOOH/VS4 micrometer composite powder as well as a preparation method and application of the VOOH/VS4 micrometer composite powder. The preparation method comprises the steps:simultaneously adding sodium metavanadate and thioacetamide into deionized water to obtain a solution A; then, dropwise adding an aqueous ammonia solution into the solution A to obtain a solution B; pouring the solution B into a reaction liner, and then, carrying out sealing for a hydrothermal reaction; next, taking out a product cooled after being reacted, alternately cleaning the product by using water and alcohol, and then, collecting the product; and freezing the cleaned product, and then, drying the product to obtain the VOOH/VS4 micrometer composite powder. The VOOH/VS4 micrometer composite powder prepared according to the preparation method is composed of uniform spheroidal structures of which the diameters are about 10mu m, parts of spheroidal structures are gathered, the insides of microspheres are formed by self-stacking micrometer VS4 short rods of which the diameters are 0.5-1.0mu m and the length is 1.0-2.0mu m, and the outsides of the microspheres are randomly formed fromVOOH long rods having the diameters of 50-200nm and single-crystal structures. The VOOH/VS4 micrometer composite powder is applied to the fields of lithium/sodium ion batteries and photo/electric catalysis. The VOOH/VS4 micrometer composite powder shows excellent electrochemical properties and catalytic property when being applied as an anode material of a sodium/lithium ion battery and a photo/electric catalyst.

The invention discloses a method for detecting the glutathione concentration of a solution. According to the method, a three electrode system is used, cyclic voltammetry is adopted to measure the glutathione concentration of a solution to be measured, the glutathione concentration of the solution can be obtained through a glutathione linear equation; in the three electrode system, the work electrode is subjected to an aminated graphene quantum dot modification treatment, and the work electrode is a glass-carbon electrode. The method has the advantages of simple operation, quick detection, and high sensitivity, and is capable of high-sensitively recognizing glutathione in a mixed sample solution.

The invention relates to a method for removing hexavalent molybdenum in water. The method for removing the hexavalent molybdenum in water is characterized in that electrostatic adsorption effect of a graphene oxide derivative material to the hexavalent molybdenum is utilized for removing the hexavalent molybdenum in water. The method for removing the hexavalent molybdenum in water has the advantages that the graphene oxide derivative material is positively charged by regulating the pH value of a mixed solution of the graphene oxide derivative material and the hexavalent molybdenum, electrostatic adsorption is carried out between the graphene oxide derivative material and a negatively charged hexavalent molybdenum material, so as to remove the hexavalent molybdenum, and graphene oxide derivative has large specific surface area, good hydrophilcity, rich surface active sites and high adsorption capacity, so that the method for removing the hexavalent molybdenum in water has good effect and high efficiency.

The invention provides an all-solid flexible micro super capacitor based on a GQD/Co(OH)2 composite material. The positive electrode of the all-solid flexible micro super capacitor is prepared from a GQD/Co(OH)2 composite material. The GQD/Co(OH)2 composite material is prepared according to the steps as follows: evenly mixing the aqueous solution of GQD (Graphene Quantum Dot) powder, Co(NO3)<2>.6H2O, KCl and water; and getting the GQD/Co(OH)2 composite material through galvanostatic deposition with the mixed solution as electrolyte and nanoporous gold wires as working electrodes. The all-solid flexible micro super capacitor based on a GQD/Co(OH)2 composite material provided by the invention has good conductivity and high energy density, and the capacity thereof is easy to control.

The invention discloses a preparation method and an application of a 3D ordered titanium dioxide inverse opal photonic crystal microsphere. The method comprises the following steps: (1) preparing a monodisperse polystyrene-methyl methacrylate-acrylic acid P (St-MMA-AA) microsphere; and (2) preparing a 3D ordered titanium dioxide inverse opal photonic crystal microsphere. According to the titaniumdioxide photonic crystal microsphere, the outer part of the microsphere has a close hexagonal deposited ordered structure, and the inner part of the microsphere has a porous structure, so that the problem that a conventional photonic crystal material has angle dependence can be solved. The 3D ordered titanium dioxide inverse opal photonic crystal microsphere is suitable for preparing a spherical photonic crystal structure with uniform size, has the advantages of large specific surface area, more surface active sites and the like, can be used for effectively improving separation of photon-generated carriers, increasing the rate of electron transmission, improving the solar utilization and enabling high photocatalytic performance.

The invention discloses a method for preparing a carbon nitride material with a nano-sheet/nano-tube composite structure, which comprises the following steps of: preparing a modified precursor by taking a carbon-nitrogen precursor, a halogen potassium compound and water as raw materials and carrying out hydrothermal treatment on a conventional carbon-nitrogen precursor by adopting the halogen potassium compound; then calcining the modified precursor at high temperature to obtain the carbon nitride material with the nano-sheet/nano-tube composite structure. Compared with the traditional bulk phase g-C3N4, on one hand, the carbon nitride material prepared by the method has the obvious nano-sheet/nano-tube composite structure, so that the specific surface area of the material is effectively improved, and the photocatalytic activity of the carbon nitride material is improved; on the other hand, a hollow tubular structure is beneficial to promoting multiple scattering of visible light inside, effectively promoting the separation and conduction of photon-generated carriers, improving the utilization rate of the material to light, and further improving the photocatalytic performance. Compared with unmodified bulk phase g-C3N4, the degradation rate of the material of the invention is improved by 30 times.

The invention discloses an aluminum oxide/titanium oxide heterojunction nano fiber carrier in an anti-sintering precious metal catalyst system as well as a preparation method and application of the carrier. The preparation method comprises the following steps: dispersing PVP into ethyl alcohol, stirring and dissolving to obtain a PVP ethyl alcohol solution; taking glacial acetic acid to be added into the solution, and adding titanium isopropoxide; dispersing aluminum acetylacetonate into an organic solvent, mixing and stirring the two solutions to obtain a precursor solution, adopting an electrostatic spinning method, indrawing the precursor solution in an injector, inserting the injector into a trace injection pump, connecting with an electrode, adjusting the flow speed and the voltage of an electrostatic field, wherein the distance from a syringe needle to a receiver is 5-15cm, and controlling the indoor humidity to be 30-50%, thereby obtaining nano fibers; sintering the nano fibers obtained by the electrostatic spinning method in a muffle furnace, thereby obtaining the aluminum oxide/titanium oxide heterojunction nano fiber carrier. The catalyst carrier disclosed by the invention is short in preparation cycle, simple in process, low in energy consumption, high in productivity, and good in reproducibility.

The invention relates to a preparation method and an application of ultra-small VS4/Super P composite nano-powder. The preparation method comprises the following steps: adding sodium metavanadate, thioacetamide and Super P to deionized water to obtain a solution A; then dropwise adding ammonia water to the solution A to obtain a solution B with pH of 9.8-10.2; pouring the solution B into a reaction lining, and sealing the reaction lining for hydrothermal reaction; washing a reaction product with water and alcohol alternately to obtain the ultra-small VS4/Super P composite nano-powder. The VS4/Super P composite nano-powder is prepared from VS4 nano-spheres and super P nano-spheres through uniform and interactive distribution. The VS4 nano-spheres are uniform in shape and uniform in size andhave diameter of 50-80 nm. The VS4 nano-spheres are prepared from single crystal VS4 flexible nano-rods with diameter of 20 nm and length of 60-100 nm through winding, and the VS4 flexible nano-rodsgrow along the (110) crystal plane orientation. The VS4/Super P composite nano-powder is applied to lithium/sodium ion batteries and photo/electro-catalytic fields and shows excellent electrochemicaland catalytic properties.

The invention discloses a method for preparing a Bi nanosheet by an electrochemical stripping process, and belongs to the technical field of micro/nano material preparation. A Bi nanosheet is preparedby adopting the electrochemical stripping process, a Pt sheet electrode is used as an anode, a metal Bi block is used as a cathode, a NaI solution is used as a supporting electrolyte solution, and stripping of blocky metal Bi is performed under the condition of 10-30 V voltage under the protection of N2. The prepared Bi nanosheet is relatively high in purity, the Faraday efficiency of preparing formic acid through electro-catalytic reduction of CO2 in a relatively wide potential range can reach 94% or above, and the current density under a relatively low electrolytic potential (-0.5 V vs.RHE)can also reach 50 mA/cm<2> or above. Compared with a mechanical method for preparing the Bi nanosheet, the electrochemical stripping process makes the Bi nanosheet with more uniform morphology and size and more surface active sites easily obtained, is simple to operate, low in energy consumption, very economical and practical, and has a very good industrial prospect.

The invention provides a method for preparing micro-porous carbon-structural electrode material from plant materials and application of the micro-porous carbon-structural electrode material and belongs to the field of new-generation energy storage. The method includes the steps of firstly, frequently boiling water and ethyl alcohol mixture containing cellulose-enriched plants to remove proteins, fats, sucrose organics; secondly, heating and drying and then subjecting the mixture to high-temperature calcination in atmosphere of protective gases, cooling naturally to obtain a micro-porous carbon-structural material; thirdly, putting the micro-porous carbon-structural material in mixed solution of sulfuric acid and nitric acid while stirring continuously for 10-20 minutes to achieve surface functionalization. According to the method, the cellulose-enriched plant residues are utilized for preparing the electrode material for the first time, acid solution can be recycled, the whole preparation is simple and free of pollution, the method can be applied to production in scale, and the prepared electrode material has excellent performance which is similar to the lithium-ion storage performance of graphene material, has high practicable value, and has potential to substitute for the commercial graphite to serve as the novel lithium-ion battery electrode material.

The invention discloses slice self-assembly microrod-like VS2 nano-powder and a preparation method thereof. The slice self-assembly microrod-like VS2 nano-powder is prepared by a simple one-step solvothermal method, water serves as a solvent, sodium metavanadate and thioacetamide serve as a vanadium source and a sulfur source, parameters such as the concentration and the ratio of materials, reaction temperature, reaction time, reaction packing ratio, solvothermal modes and drying modes are cooperatively controlled, particularly, the parameter of the weight of the sodium metavanadate and the thioacetamide is strictly controlled, and the slice self-assembly microrod-like VS2 nano-powder can be prepared by the one-step solvothermal method. According to the method, the reaction process is simple and easily controlled, the temperature is low, large equipment and extreme reaction conditions are omitted, and controllable self-assembly of ultrathin VS2 nano-sheets can be realized. When the product is used as a sodium/lithium ion battery negative electrode material and a photo/electro-catalyst, excellent electrochemical performances and catalytic performances can be shown.

The invention discloses a non-noble metal amorphous water electrolysis anode material and an in-situ growth preparation method thereof. The non-noble metal water electrolysis anode material is (FeaCobNic)xMy, the atomic percent of a+b+c is equal to 1, 0.1<=a<=0.9, 0<=b<=0.9, 0.1<=c<=0.9, 80<=x<=90, 10<=y<=20, and M is one or more of B, S, P and Si, the (FeaCobNic)xMy water electrolysis anode material is an amorphous alloy thin strip prepared by adopting electric arc melting and vacuum induction melting melt-spinning, and the amorphous alloy thin strip is used as a precursor and an electrochemical cyclic voltammetry is adopted to perform in-situ growth on surface metal to obtain a nickel-iron-cobalt oxide state substance, thereby preparing an efficient in-situ growth non-noble metal water electrolysis catalyst. The method is simple in process, low in preparation cost, easy to operate, stable in performance and convenient for large-scale production.

The invention discloses a preparation method and application of a dodecahedral zinc oxide nano material. The preparation method specifically comprises the following steps of: carrying out complexationreaction on zinc nitrate hexahydrate and 2-methylimidazole to obtain a metal organic framework material (ZIF-8); washing the ZIF-8, carrying out vacuum drying, separately carrying out continuous high-temperature calcination in a tubular furnace under argon and air atmospheres to obtain a dodecahedral zinc oxide nano material; irradiating a nano semiconductor gas sensor prepared from the dodecahedral zinc oxide nano material by using an ultraviolet light source at a working temperature of 100-220 DEG C for acetone gas detection. The gas sensor prepared from the dodecahedral zinc oxide nano material has a remarkable enhancing effect on the gas sensitivity of acetone gas under the irradiation of an ultraviolet light source and has the characteristics of good selectivity, strong stability andthe like; the nano semiconductor gas sensor has a photo-assisted sensibilization characteristic and a wide application prospect.

The invention discloses an AC/g-C3N4 composite photocatalytic material and a preparation method thereof, and relates to the technical field of photocatalytic materials. The AC/g-C3N4 composite photocatalytic material and the preparation method thereof in the invention solve the technical problem of lack of an effective photocatalytic material for treating chromium-containing wastewater in the prior art. The preparation method for the AC/g-C3N4 composite photocatalytic material provided by the invention comprises the following steps: calcining dicyandiamide serving as a precursor so as to obtain g-C3N4 powder, proportioning the g-C3N4 powder and active carbon powder in proportion, and preparing the AC/g-C3N4 composite photocatalytic material by a hydrothermal method. The AC/g-C3N4 compositephotocatalytic material and the preparation method thereof have the advantages of low cost, simple process and environmental friendliness, can effectively treat the chromium-containing wastewater under the irradiation of visible light, and have good application prospects.

The invention provides a Ru monatomic and g-C3N4 composite photocatalyst and a preparation method and application thereof, and belongs to the technical field of nano material synthesis. According to the device, Ru monatomic is loaded on the surface of g-C3N4 by utilizing a simple and rapid one-step calcination method, so that the Ru monatomic and g-C3N4 composite photocatalyst is formed; the photocatalyst can efficiently and stably produce hydrogen through water photolysis under visible light.

The invention relates to a g-C3N4 nanosheet/graphene oxide composite material and a preparation method and application thereof. According to the composite material, Bulk-g-C3N4 is synthesized througha pyrolysis method, then g-C3N4 nanosheets are synthesized through an ultrasonic-assisted method and finally the g-C3N4 nanosheets are fixed on the surface of graphene oxide through an ultrasonic method to obtain the composite material. The composite material is modified on the surface of a glassy carbon electrode to prepare a novel sensor for simultaneous, rapid and real-time detection of acetaminophen and levofloxacin. Results show that the sensor has a wide linear range, a low detection limit and high sensitivity for detection of two substances. High-sensitivity detection and analysis of acetaminophen and levofloxacin can be realized and high selectivity can be obtained in the complex environment medium. Meanwhile, the composite material has the advantages of being simple in instrumentand equipment, low in analysis cost, rapid, simple, convenient and the like, and a new detection method can be provided for evaluating residual pollution of acetaminophen and levofloxacin in the environment.

The invention discloses a graphite carbon nitride nanotube array photoelectrode, a preparation method of the array photoelectrode and application in solar energy photoelectrochemistry decomposition water generation oxygen serving as a photo-anode. The diameters and lengths of graphite carbon nitride nanotubes in the graphite carbon nitride nanotube array photoelectrode can be adjusted, the diameter range is 20nm-170nm, and the length range is 400nm-2500nm. The graphite carbon nitride nanotube array photoelectrode is obtained by high-temperature condensation polymerization in an inert atmosphere with anodized aluminum supported by a conductive substrate as a template and with concentrated cyanamide solutions as a precursor. The graphite carbon nitride nanotube array photoelectrode has a large specific area and more surface activity sites, serves as the photo-anode to be applied in solar energy photoelectrochemistry decomposition water generation oxygen, and has excellent performance.

The invention discloses a preparation method and application of a flower-like iron-doped cobalt phosphide (Fe-CoP) microsphere for a sodium-ion battery negative electrode material. The method includes: taking carbonized sweet osmanthus leaves as a substrate carbon film, immersing the carbon film in a nitrate solution containing iron and cobalt for hydrothermal reaction, and when a hydrothermal kettle is cooled to room temperature after a certain period of reaction, washing and drying a precursor product, conducting phosphating treatment to obtain flower-like microsphere deposited on the carbonfilm with unchanged microstructure. The flower-like microsphere is composed of nanosheets and has a large specific surface area, and the microsphere is uniform in size, thus not only facilitating rapid transmission of ions, but also easing large volume expansion of the electrode material. The doped iron element can increase the sodium storage sites of the electrode material and improve the electrochemical performance of the electrode material. The invention provides a new idea for preparation of the sodium ion battery negative electrode material, and the preparation method has the characteristics of simple operation process and low preparation cost, and is expected to realize large-scale application.