178results about How to "Add reactive sites" patented technology

The invention relates to a Nickel single-active site graphite-phase carbon Nitride-based photocatalytic material as well as a preparation method and application thereof, in the photocatalytic material, Ni is dispersed in a g-C3N4 framework in a single-atom-level degree to form active sites, and the molar content of the Ni is 1-5%. the nickel single-active site graphite-phase carbon nitride-based photocatalytic material has a large specific surface area, is good in dispersion in an aqueous solution, and can effectively inhibit the recombination of photo-generated carriers, the reaction activitysites of the surface of the g-C3N4 are increased, the photocatalytic hydrogen production efficiency can be remarkably improved, and the photocatalytic reaction activity of the g-C3N4 can be improved.

The invention discloses a CdS/metallic organic frame composite photocatalysis material as well as a preparation method and application thereof. The composite photocatalysis material is prepared by modifying a metallic organic frame on the surfaces of CdS nanoparticles. The preparation method of the composite photocatalysis material comprises the following steps: firstly, synthesizing the CdS nanoparticles by using a solvent thermal method, and modifying the metallic organic frame on the surfaces of the CdS nanoparticles by using an in-situ heterogeneous deposition method, thereby obtaining theCdS/metallic organic frame composite photocatalysis material. Compared with conventional CdS, the CdS/metallic organic frame composite photocatalysis material has improved photoelectric stability, and conversion efficiency, circulation stability and catalysis selectivity of photocatalytic reduction of carbon dioxide.

The invention belongs to the field of environmental catalysis, and discloses a photocatalyst for efficiently degrading tetracycline under visible light and a preparation method and application of thephotocatalyst. The preparation method of the photocatalyst comprises the following steps: mixing a nitrogen-containing compound in water, carrying out hydrothermal treatment, cooling, transferring into a culture dish, and carrying out freeze drying treatment to obtain a precursor; and putting the precursor into a closed environment for high-temperature roasting, and naturally cooling to obtain thegraphite-phase carbon nitride photocatalyst for efficiently degrading tetracycline under visible light. According to the preparation method, the raw materials are mixed for hydro-thermal treatment and freeze-drying treatment to obtain the precursor, the graphite-phase carbon nitride obtained through constant-temperature roasting under different conditions has a relatively high specific surface area, and the separation of photo-induced electrons and holes can be effectively promoted through the formation of material defects; therefore, the purpose of efficiently degrading 10 mg/L tetracyclinehydrochloride under visible light is achieved.

The invention discloses a simple preparation method of a high-dispersion nickel oxide cluster modified carbon nitride photocatalyst for decomposing water to produce hydrogen. The simple preparation method comprises the following steps: adjusting the pH (Potential of Hydrogen) value of a mixture of g-C3N4, nickel chloride hexahydrate and de-ionized water with ammonia water by adopting a simple impregnation-precipitation method; stirring and standing at room temperature; evaporating to remove all the water at 100 DEG C to 150 DEG C; calcining to obtain the high-dispersion nickel oxide cluster modified two-dimensional carbon nitride photocatalyst. The preparation process of the photocatalyst is simple; the prepared photocatalyst has a large specific surface area and NiO is loaded on the surface of the two-dimensional g-C3N4 in a high-dispersion nickel oxide cluster form, so that the quantity of reaction active sites of the photocatalyst is increased and the visible light response degree is improved. Compared with a granular NiO/g-C3N4 photocatalyst, the photocatalyst disclosed by the invention has a more excellent photocatalytic property in a process of catalyzing the decomposition of the water to produce the hydrogen; under the condition that NiO loading amounts are the same, the yield of the hydrogen is improved by 7 to 8 times.

The invention discloses a ternary CoFeCr hydrotalcite nanorod and a preparation method and application thereof. The preparation method comprises the steps: mixing cobalt nitrate, iron nitrate, chromium nitrate, urea and ammonium fluoride in water so as to prepare a precursor mixed solution, placing a substrate in the precursor mixed solution, transferring the substrate together with the precursormixed solution to an autoclave, and then performing a reacting at 110-130 DEG C for 360-600 minutes so as to prepare the ternary CoFeCr hydrotalcite nanorod on the substrate. The ternary CoFeCr hydrotalcite nanorod together with the substrate is directly used as a working electrode for electrochemical decomposition of water. Not only the ternary CoFeCr hydrotalcite nanorod has better performance of water electrolysis and oxygen evolution than transition metal oxide in the prior art, but also the preparation process is simple, fast and efficient, has low production energy consumption, low production cost, environmental protection and no pollution, and is suitable for large-scale industrial production.

The invention belongs to the technical field of electrode materials, and discloses a titanium dioxide nanotube/polyaniline composite electrode, preparation and application thereof. The preparation method comprises the following steps: preprocessing a titanium plate, then performing a first electrochemical oxidation treatment on the titanium plate in an ethylene glycol solution including NH4F and deionized water, and removing an oxide film by ultrasonic; placing the titanium plate in an ethylene glycol solution including NH4F, H3PO4 and deionized water and performing a second electrochemical oxidation treatment on the titanium plate, performing high temperature calcination in hydrogen atmosphere and obtaining the titanium dioxide nanotube; then taking an acidic aqueous solution of an aniline monomer as an electrolyte, performing a constant voltage polymerization reaction for 1 to 15min under a voltage of 0.5 to 1V, cleaning and drying, and then obtaining the titanium dioxide nanotube/polyaniline composite electrode. The preparation method disclosed by the invention adopts a two-step anodic oxidation and hydrogen treatment process, so that the composite electrode has a good conductivity, high specific capacitance and good stability, and the method can be used for the preparation of high performance capacitors.

The invention discloses a MoS2/TiO2NTs heterojunction photo-electro-catalyst substituting a noble metal Pt sheet for hydrogen evolution and a preparation method of the MoS2/TiO2NTs heterojunction photo-electro-catalyst. The MoS2/TiO2NTs heterojunction photo-electro-catalyst is synthesized by a two-step method. Firstly, a metal Ti sheet is subjected to anodic oxidation and TiO2NTs having a high specific surface area and gaps is formed by taking a diglycol and HF system as a solvent and the Ti sheet as a titanium source through an anodic oxidation process; secondly, MoS2 is loaded onto the prepared TiO2NTs by taking sodium molybdate and thiacetamide as a Mo source and a S source respectively, and taking diglycol as a solvent through kettle heating. A TiO2 surface layer structure, by using the specific surface area of a MoS2 layer, can improve the absorption to H2O molecules; in addition, MoS2 has excellent electron conduction ability and side belt effect, so that the number of reaction active sites are increased; photoelectrocatalysis collaboration can effectively separate electrons from cavities, so that the photocatalysis activity is improved, and hydrogen can be produced rapidly and efficiently by the decomposition in the presence of the MoS2/TiO2NTs heterojunction photo-electro-catalyst.

The invention discloses an efficient and feasible activation treatment method for a graphite felt cathode of an Electro-Fenton system. In the method, the graphite felt is uniformly mixed with strong alkaline oxidants of sodium hydroxide, potassium hydroxide and the like, and subjected to high-temperature treatment under the protection of an inert atmosphere, so as to obtain the activated graphite felt. The graphite felt subjected to the activation treatment through the technology of the method disclosed by the invention is used as a cathode material and applied to the Electro-Fenton system, and capable of effectively improving the electrocatalytic activity of H2O2 generation reaction adopting cathodic oxygen reduction, and remarkably improving the degradation capacity of organic pollutants; and moreover, the activated material is excellent in stability and reuse performance. The method disclosed by the invention does not need to use poisonous and volatile reagents, as well as is simple in process, convenient and controllable, and good in application prospect.

The invention relates to a carbon nano rod composite material and a preparation method and an application thereof. The technical problems are solved that the active substance of an existing electrostatic spinning technology is low in content, aggregates easily, and is large in fiber diameter and poor in electrochemical performance, an external layer is a carbon wrapping layer, an internal layer isthe active substance, the active substance is a one-dimensional metal oxide and is provided with mesopores, the content of the active substance is 50-80wt%, and the diameter of a nano rod is 30-100 nanometers. The invention provides the preparation method and the application of the carbon nano rod composite material ate the same time. The carbon nano rod composite material is easy in technology,the active substance of the obtained material is high in content and is evenly dispersed, the material is provided with rich pore structures, the diameter of the nano rod is low, and the material hasexcellent electrochemical performance as an electrode material.

The invention discloses a preparation method of fiber-shaped carbon nitride. By directly roasting a nitrogen-carbon precursor, bulk phase carbon nitride is obtained, then bulk phase carbon nitride ismixed with a saturated solution of soluble salt, stirring and heating are conducted until evaporation to dryness is achieved, a solid mixture of soluble salt and carbon nitride powder is obtained, andfinally the obtained solid mixture is roasted, cleaned and dried to obtain fiber-shaped carbon nitride. The prepared fiber-shaped carbon nitride has an obvious nano size effect, the specific surfacearea of the material can be effectively increased, the reaction active site is added, and the photocatalytic performance of the material is improved; fiber-shaped carbon nitride is even in size, goodin dispersity and smooth in surface, has hydrophobicity and low density, and can be evenly dispersed into a dye solution, the defect is overcome that bulk phase carbon nitride is easily gathered in the traditional degradation process, and it is guaranteed that the photocatalytic process is stably and efficiently conducted.

The invention discloses a preparation method of a SnS2/SnO2 lithium ion battery anode material in hollow-sphere structure. The method includes: 1) adding SnCl4.5H2O in a mixed liquid of deionized water and anhydrous ethanol to fully dissolve the component for forming a solution A, and dissolving NaOH in the solution A to prepare a solution B; 2) under stirring, adding urea to the solution B and continuously stirring the solution to prepare a uniform mixed solution C, and performing a homogeneous hydrothermal reaction on the mixed solution C; 3) after the reaction is finished, washing and drying a product to obtain a SnO2 precursor; 4) heating the SnO2 precursor to burning to prepare SnO2 powder; 5) dispersing the SnO2 powder in ethanol with stirring to prepare a uniform mixed suspension D;6) adding SnCl4.5H2O and TAA to the suspension D with stirring until the components are completely dissolved to obtain a homogenous suspension E; 7) performing a microwave thermal reaction on the suspension E, when the reaction is finished, moving-out and washing and drying the product to prepare the SnS2/SnO2 lithium ion battery anode material in hollow-sphere structure.

The invention discloses a method for preparing a high-voltage-resistant electrode material from porous carbon polyaniline. The method comprises the steps of preparing hydroxylated porous carbon, preparing a hydroxylated porous carbon/polyaniline composite material, preparing an electrode plate and carrying out an electrochemical performance test. The preparation method has the beneficial effects that wheat flour is used as a carbon source, potassium hydroxide (KOH) and urea are used as raw materials, wherein the potassium hydroxide is used as an activating agent, nitrogen-doped hydroxylated porous carbon obtained through a high-temperature carbonization-acid treatment method is used as a precursor, and then the hydroxylated porous carbon/polyaniline composite material is prepared through an in-situ polymerization method; the polyaniline-coated hydroxylated porous carbon composite material prepared by the invention has the advantages of excellent conductivity, large specific surface area and stable physical and chemical properties, and can be used as an electrode material of a water system supercapacitor with an ultrahigh voltage window.

The invention relates to a preparation method and application of a fuel cell catalyst. Electrochemical dealloying is performed. The synthesis method adopts a continuous reduction method, and includesthe steps that a triblock copolymer P123 serves as a protecting agent, and sodium borohydride serves as a reducing agent; a certain amount of P123 is taken and dissolved in redistilled water, a cobaltchloride solution is added to the P123 solution, before reaction, nitrogen is introduced to remove oxygen, continuous stirring is performed, and the reaction temperature is controlled to be room temperature (30 DEG C); a sodium borohydride solution is slowly dropwise added to the reaction liquid, 30 minutes after dropwise adding, a mixed solution of chloroauric acid and potassium chloropalladateis slowly dropwise added to the reaction liquid, and the reaction is stopped after lasting 4 hours; the reaction liquid is centrifuged and washed three to five times to obtain the ternary CoAuPd alloycatalyst for fuel cells. The special ternary CoAuPd alloy catalyst has excellent methanol catalytic oxidation performance and oxygen reduction catalytic activity after electrochemical gradient dealloying and is a fuel cell catalyst with broad development prospects.

The invention relates to a preparation method and an application of a nonmetal BCN/g-C3N4 Van der Waals heterojunction photocatalyst. A convenient and efficient calcination synthesis technology is utilized to perform secondary calcination on a BCN nanosheet obtained by one-step calcination and g-C3N4, so that the BCN nanosheet is compounded on the surface of the g-C3N4 to form the BCN/g-C3N4 Van der Waals heterojunction photocatalyst with a stable structure; and the photoatalyst achieves stable and efficient hydrogen production by photolysis of water under visible light. The BCN/g-C3N4 Van derWaals heterojunction photocatalyst prepared in the invention has high stability and reusability; and additionally, the method has the advantages of simplicity, low cost, greenness, non-toxicity, veryhigh practical values and very high application prospect.

The invention relates to a preparation method of a multi-functional group antibacterial biogas residue adsorbent for adsorbing heavy metals and anions. The method comprises that with a biogas residueproduced by crop straw fuel formation and epoxy chloropropane as main raw materials, with ethylenediamine, triethylamine, hexamethylenediamine, diethylenetriamine, triethylene tetramine, or diethylaminopropylamine as cross-linking agents, the adsorbent is prepared in the presence of an N,N-dimethyl formamide medium; the prepared novel multi-functional group antibacterial biogas residue-based adsorbent has the advantages of simple production process, low cost, easy modification, large mechanical strength, wide use range, good adsorption effect, strong antibacterial property, low secondary pollution, large adsorption capacity, high adsorbing capacity specially for copper ions, nickel ions, nitrate radicals, phosphate radicals, dichromate radicals and anion dye ions, even attachment of chemical functional groups, large specific surface area and strong adhesion power. The adsorbent can be widely applied in all kinds of polluted water bodies containing various heavy metal ions and anions, such as industrial wastewater, eutrophic water bodies, chromium-containing wastewater, printing and dyeing wastewater or other polluted water bodies.

The invention discloses a nickel-based self-supporting water electrolysis catalyst. According to the catalyst, a NiO/CeO2 nano sheet array is loaded on flexible carbon cloth to form a three-dimensional self-supporting stable structure. Nickel oxide overcomes the problem of poor conductivity of the material, can reduce the polarization phenomenon in the electro-catalysis process, and reduces the energy potential barrier of the reaction. Oxygen vacancies in cerium oxide can provide more active sites for the reaction, so that the adsorption of reaction intermediates is facilitated. Cerium oxide has more effective different-phase nano junction interfaces, and generates a synergistic effect and an interface effect with nickel oxide, so that active sites in the catalytic process are increased, and the catalytic performance is improved. The three-dimensional self-supporting structure of the catalyst also obviously improves the catalytic stability. The invention also discloses a preparation method of the catalyst, and the preparation method has the advantages of simple synthesis steps and controllable product morphology, is suitable for industrial popularization, and has certain large-scale application prospects.

The invention discloses a preparation method of a zero-dimensional/two-dimensional structure copper oxide and tourmaline composite photocatalytic material. Natural tourmaline, an alkali and metal copper salt are taken as raw materials, precipitation-hydrothermal method is adopted to prepare the copper oxide/tourmaline composite material, and the preparation method comprises the following steps: firstly, ultrasonically preparing a tourmaline/water suspension system; secondly, dissolving a copper salt into the suspension system, dropwise adding an alkaline solution, and violently stirring; and finally, putting an obtained mixed system into a reaction kettle for hydrothermal reaction, and washing, drying and grinding an obtained product to obtain the zero-dimensional/two-dimensional structurecopper oxide and tourmaline composite photocatalytic material. Due to the introduction of tourmaline, the agglomeration of two-dimensional copper oxide nanosheets can be relieved, and the photocatalytic performance of copper oxide can be effectively improved. The preparation method is simple to operate, mild in condition, low in cost and rich in raw material source, and the synthesized compositematerial has good photocatalytic activity and durability.

The invention discloses a preparation method and application of a cobalt-loaded porous carbon composite graphene electrocatalyst. The preparation method comprises the following steps: (1) mixing and stirring cobalt salt, a carbon source and deionized water, adding graphene oxide, and carrying out ultrasonic treatment to obtain a mixed solution; (2) transferring the mixed solution into a reaction kettle for heating reaction, and cooling, centrifuging, washing and drying after the reaction to obtain a cobalt-loaded graphene/carbon material; (3) mixing and reacting a nitrogen-containing organic matter, an organic solvent and the cobalt-loaded graphene/carbon material, cooling, removing the organic solvent, and drying to obtain a pre-product; and (4) under the protection of inert gas, heatingand calcining the pre-product, and cooling to obtain the cobalt-loaded porous carbon composite graphene electrocatalyst. The electrocatalyst is applied to a zinc-air battery. The preparation method issimple and low in cost. The prepared electrocatalyst is excellent in catalytic performance and good in repeatability, and the open-circuit voltage of the battery can be greatly improved when the electrocatalyst is applied to the zinc-air battery.

The invention provides a preparation method of a nanometer flower spherical cobalt disulfide composite material, comprising the following steps: S1) mixing an organic acid cobalt salt and an organic sulfur source with a diol solvent, and obtaining an intermediate product after hydrothermal reaction. The organic sulfur source contains amino groups; S2) mixing the intermediate product with sulfur powder and annealing in a protective atmosphere to obtain a nano-flower spherical cobalt disulfide composite material. In accordance with that prior art, the above preparation method is simple, Short cycle and high efficiency, and the folded cobalt disulfide nanosheets have larger specific surface area, conducive to the exchange and transfer of sodium ions and electrons, but also conducive to the infiltration of electrolyte,at the same time, the carbon layer doped with nitrogen on the surface can enhance the conductivity of cobalt disulfide and provide a protective layer when cobalt disulfide electrochemically reacts, which buffers the internal stress caused by the volume change of cobalt disulfide, which is beneficial to the structural stability of cobalt disulfide and enhances the structural strength of the composite.