24results about How to "Change electronic structure" patented technology

The invention discloses a nickel and cadmium-containing nonferrous metal wastewater treatment method, and relates to the technical field of wastewater treatment. The preparation method comprises the following steps: by taking polyvinyl alcohol and gelatin as raw materials, carrying out amination modification through 3-amino-trimethoxysilane to prepare an aminated gelatin solution, and then adding a modified metal organic framework adsorption material and modified nitrogen-containing biochar to react to prepare an adsorbent with a good adsorption effect on metal nickel and cadmium. The modified metal organic framework adsorption material and the modified nitrogen-containing biochar have amino groups, so that the modified metal organic framework adsorption material and the modified nitrogen-containing biochar have good dispersibility in the aminated gelatin, and the adsorption effect of the adsorbent is improved.

The invention provides a toxic gas intelligent early warning platform based on sensor monitoring, and relates to the technical field of gas monitoring. An initial two-dimensional material is set through a two-dimensional material setting unit; the doping module acquisition unit acquires a doping module; the doping processing unit outputs a doped two-dimensional material sample according to the doping module, sensor simulation is carried out through the sensor structure simulation platform, and a plurality of simulation sensors are output; the toxic gas sample collection unit collects toxic gas samples of a target monitoring environment; the adsorption capacity evaluation unit is used for evaluating the toxic gas adsorption capacity of the plurality of simulation sensors to obtain a preferable sensor; and the toxic gas early warning unit performs toxic gas early warning on the target monitoring environment according to the preferred sensor. The technical problem that the accuracy of the monitoring result is limited due to the fact that the configuration of the sensor cannot be adjusted according to the monitoring environment adaptability in existing toxic gas monitoring and early warning is solved, and the accuracy and the environment adaptability of toxic gas early warning are improved.

The invention discloses a non-noble metal M-doped carbon-supported PtM alloy catalyst as well as a preparation method and application thereof, relates to a PtM alloy catalyst as well as a preparation method and application thereof, and aims to solve the technical problems of poor catalytic activity and insufficient adaptability of the existing PtM alloy catalyst. According to the catalyst, PtM alloy nanoparticles are uniformly supported on a non-noble metal M-doped carbon carrier, wherein M is Co, Fe, Zn, Ni or Ce. The preparation method comprises the following steps: M-doped carbon is taken as a carrier, Pt is loaded by adopting a microwave reduction method, then the non-noble metal M-doped carbon-loaded PtM alloy catalyst is obtained through high-temperature alloying, the mass activity of PtCo / Co-NC-C and the mass activity of Pt / Fe-NC-C are 0.381 mA / [mu] gPt and 0.285 A / mgPt respectively and are about 3.4 times and 2.5 times of the mass activity of 20% Pt / C, and the catalyst can be used in the field of proton exchange membrane fuel cells.

The invention relates to the technical field of catalysts, in particular to a catalyst for hydrodechlorination synthesis of 2, 3-dichloropyridine, a preparation method of the catalyst and a synthesis method of the 2, 3-dichloropyridine. The catalyst comprises a carrier, an active component loaded on the carrier and a coating layer located outside the carrier, the active component is Pd; and the coating layer is made of a nitrogen-doped carbon material. According to the present invention, the nitrogen-doped carbon material (CN) is adopted to coat the Al2O3-loaded Pd catalyst (PdM / Al2O3, and M is adopted as the auxiliary agent), the acid-base property of the catalyst surface is adjusted, and the electronic structure of Pd can be changed through the interaction of CN and Pd so as to improve the catalytic performance of the catalyst; meanwhile, CN can inhibit poisoning, loss and aggregation of the Pd active component, so that the stability and recycling performance of the catalyst are improved. In addition, due to the addition of the auxiliary agent, the dispersity of Pd is improved, and the activity of the catalyst is further improved.

The invention provides a modified lithium iron manganese phosphate material and a preparation method thereof, a positive electrode material and a lithium ion battery. The modified lithium manganese iron phosphate material comprises an inner core and a hydrophobic carbon layer coated on the surface of the inner core, and the inner core comprises a lithium manganese iron phosphate material doped with niobium and / or aluminum; the raw material of the hydrophobic carbon layer is a carbon source modified by a specific hydrophobic agent. The hydrophobic agent is adopted to modify and graft the carbon source, so that a stable core-shell structure can be formed, and the stability of the lithium manganese iron phosphate structure can be effectively improved; the hydrophobic agent grafted on the surface of the carbon source and a carbon chain structure provided by the carbon source are beneficial to improving the electronic conductivity and conductivity of the lithium manganese iron phosphate material; by doping specific elements, collapse of a lithium manganese iron phosphate crystal structure can be effectively inhibited, and the electronic conductivity of the lithium manganese iron phosphate crystal structure is improved; the hydrophobic property of the lithium manganese iron phosphate material is remarkably improved by the specific type of hydrophobic agent, and the electrochemical performance of the material is favorably improved.

The invention discloses a VOCs tail gas treatment system, and belongs to the technical field of waste gas treatment. The VOCs tail gas treatment system comprises the following steps: (1) pretreatment: carrying out condensation treatment on collected VOCs tail gas; (2) filtering: carrying out primary filtering on the VOCs tail gas subjected to condensation treatment through a filter; (3) adsorption: adsorbing the VOCs tail gas subjected to primary filtration treatment by adopting a modified molecular sieve adsorbent; (4) catalysis: carrying out degradation treatment on the VOCs tail gas subjected to adsorption treatment through a photocatalysis system; and (5) re-adsorption: adsorbing the VOCs tail gas subjected to degradation treatment by adopting modified activated carbon, and discharging the VOCs tail gas after the VOCs tail gas is detected to be qualified. The VOCs tail gas treatment system is sequentially provided with a condensation pretreatment step, a filtering step, a molecular sieve adsorption step, a photocatalysis step and an activated carbon re-adsorption step, an adsorption method and a catalysis method are combined, the two methods have a synergistic effect, and the VOCs tail gas treatment efficiency can be improved.

The invention provides a preparation method of a high-selectivity semi-hydrogenation MOF (Metal Organic Framework) supported palladium catalyst for catalyzing acetylene. According to the invention, 2-methylimidazole is used as a ligand, Zn < 2 + > is used as a metal node, water is used as a solvent, and a ZIF-8-dia carrier is synthesized at room temperature by controlling the molar ratio of Zn < 2 + > to 2-methylimidazole; and depositing Pd < 2 + > on the ZIF-8-dia carrier by using a reducing agent to synthesize the MOF supported palladium catalyst. Strong electron interaction is formed between Pd nano-particles and a carrier loaded in the MOF loaded palladium catalyst, a rich Pd-N structure is constructed on the interface of the Pd nano-particles and the carrier, formation of Pd0 species is inhibited, the hydrogen activation capacity of the Pd nano-particles is reduced, excessive hydrogenation of acetylene is inhibited, and therefore the selectivity of ethylene is improved; the catalyst shows excellent catalytic performance in acetylene hydrogenation reaction, at 160 DEG C, the acetylene conversion rate reaches 100%, the ethylene selectivity is 85%, and the catalyst has excellent durability and stability.

The invention relates to an alkaline system urea oxidation catalyst, which is a Ni-Ni3S2 composite catalyst obtained by adding a sulfur salt into a mixed solution of raw materials of nickel salt, urea and melamine for preparing a nickel-based catalyst, preparing a catalyst precursor by a hydrothermal method, and calcining at a high temperature of 550-650 DEG C in an inert atmosphere. The second element sulfur is introduced into the nickel-based catalyst, the electronic structure of the catalyst is changed, the conductivity of the catalyst is improved, and charge transfer in the catalysis process is promoted, so that the reaction rate is increased, and the catalytic activity of the Ni-Ni3S2 composite catalyst is further improved.

The invention discloses a B-CN / P-CN homogeneous heterojunction with local electron difference and uniform dispersion as well as a construction method and application thereof, and belongs to the technical field of photocatalytic reaction materials. A simple pre-doping and fused salt assisted two-step calcination method is adopted, firstly, an electron-deficient body (boron) and an electron-rich body (phosphorus) are pre-doped in a precursor respectively, the electronic structure of a carbon nitride intermediate is regulated and controlled, then a KCl / LiCl salt mixture is used as a liquid reaction medium, and a B-CN / P-CN homogeneous heterojunction with local electron difference and uniform dispersion is constructed; additional acceptor impurities and donor impurities are generated through doping of B and P, the electronic structure of carbon nitride is changed, and a built-in electric field is formed at the interface of B-CN and P-CN, so that directional migration of photo-generated carriers and the separation efficiency of photo-generated carrier current are promoted, the photocatalytic performance of the material is greatly improved, and the photocatalytic performance of the material is improved. The prepared RhB photocatalyst has excellent RhB photocatalytic degradation performance under visible light irradiation, the degradation rate can reach 97.5%, the degradation rate constant is 1.5 times that of pure-phase CN, and the RhB photocatalyst has good stability.

The invention discloses a preparation method of lignin and silk fibroin carbon fibers. The preparation method comprises the following steps: S1, extracting graded lignin; s2, extraction of silk fibroin; s3, grading lignin and silk fibroin in-situ synthesis; mixing the ethanol graded lignin solution and the silk fibroin solution, adding horse radish peroxidase with the mass fraction of 1%, and uniformly mixing to obtain an electrostatic spinning solution; s4, preparing continuous nitrogen-doped lignin and silk fibroin fibers through electrostatic spinning; s5, carrying out continuous nitrogen-doped lignin and silk fibroin fiber pre-oxidation to obtain a trapezoidal polymer structure; then carrying out carbonization treatment to obtain nitrogen-doped lignin and silk fibroin carbon fibers; according to the invention, a nitrogen doping technology is combined with the preparation of lignin and silk fibroin carbon fibers, so that not only can the sustainability and economic benefits of the pulping and papermaking industry be improved, but also new performance characteristics such as better biocompatibility and degradability can be injected into the carbon fiber material.

The application discloses a preparation method of a closed micropore structure sodium ion battery negative electrode hard carbon material, and comprises the following steps: S1, preparation of a precursor mixed solution: biomass raw material powder and an inorganic acid pore former are used to prepare the precursor mixed solution; S2, carbon precursor drying: the precursor mixed solution is dried to prepare the carbon precursor; S3, pore forming of a closed pore carbon intermediate: the carbon precursor is subjected to high-temperature activation reaction to obtain the closed pore carbon intermediate with a micropore structure after activation; S4, closed pore carbon intermediate refining treatment: the carbon intermediate is crushed and refined, and the refined closed pore carbon intermediate is obtained through sieving; and S5, high-temperature carbonization of the hard carbon material: the refined carbon intermediate obtained in the step S4 is subjected to high-temperature carbonization to obtain the hard carbon material with the closed micropore structure. The application has the characteristics of a green and environment-friendly process, a small specific surface area and excellent electrochemical performance.

The invention discloses a preparation method of a complex-derived CNT-Pd nano-catalyst and application of the complex-derived CNT-Pd nano-catalyst in preparation of CO through electrocatalytic reduction of CO2, and relates to the technical field of preparation of palladium nano-catalysts. The invention aims to solve the problems of poor catalytic performance and low atom utilization rate of the traditional noble metal Pd-based catalyst for electrocatalytic reduction of CO2 into CO. According to the preparation method, rich defect sites are constructed on the surface of the carbon nano tube through the activation step, so that the structural stability of the Pd nano particles is improved, the small-size noble metal Pd nano particles are uniformly dispersed, and the atom utilization rate of noble metal elements is effectively increased; the C element in the carbon nano tube has high electronegativity, can effectively change the electronic structure of the Pd nano particle after being compounded with the Pd nano particle, and can effectively enhance the catalytic performance of the catalyst for reducing CO2 to prepare CO. The invention can obtain the preparation method of the complex-derived CNT-Pd nano-catalyst and the application of the complex-derived CNT-Pd nano-catalyst in preparation of CO by electrocatalytic reduction of CO2.

The invention provides a negative electrode material. The negative electrode material comprises arsenic-doped graphene, layered stannous sulfide anchored on the arsenic-doped graphene, and phosphate ions introduced between stannous sulfide layers in situ. The negative electrode material provided by the invention has high conductivity, high cycle stability and high dynamic performance. The invention further provides a preparation method of the negative electrode material. The preparation method is simple to operate. The invention also provides an application of the negative electrode material in a potassium ion battery.

This invention relates to the field of battery fabrication, specifically disclosing a tetragonal zirconium dioxide / carbon sphere composite material and its preparation method and application. The method includes the following steps: (1) dissolving zirconium tetrachloride in a solvent, then adding dopamine, and after thorough dissolution and mixing, slowly adding ammonia water. As ammonia water is added, the solution gradually turns into a milky white opaque liquid. The solution is continuously stirred at room temperature until it gradually changes from milky white to brownish-black, obtaining a zirconium-based / polydopamine composite precursor; (2) centrifuging the obtained zirconium-based / polydopamine composite precursor, washing it to obtain a brownish-black precipitate, drying the brownish-black precipitate to obtain a brownish-black precursor powder; (3) calcining the precursor powder to obtain a tetragonal zirconium dioxide / carbon sphere composite material. This invention successfully constructs a metastable tetragonal zirconium dioxide composite catalyst induced by polydopamine and confined to the surface of carbon spheres.

The invention belongs to the technical field of nano material preparation, and provides a preparation method of a biomass-derived molybdenum carbide-based electrochemical hydrogen evolution catalyst. Specifically, biomass Chinese yam with a wide source is used as a carbon and nitrogen source, a molybdenum-based precursor is obtained through simple impurity removal, airing, grinding and hydrothermal reaction with ammonium molybdate, then the precursor is roasted in an inert atmosphere, and the biomass nitrogen-doped carbon-molybdenum carbide nano composite catalyst is prepared by adjusting the carbonization temperature and the carbon-molybdenum ratio of reaction raw materials. The molybdate and the common biomass Chinese yam are adopted as raw materials, the source is wide, the price is low, the preparation method is simple and safe, and the controllability of the preparation process is high. In the prepared composite material, molybdenum carbide particles are good in dispersity on biomass carbon, and the composite material has good electrochemical activity and stability when being applied to an electro-catalysis water desorption hydrogen desorption reaction.

The invention discloses a sulfur-containing organic ligand modified Pt nanoparticle-loaded catalyst, a preparation method and application. A carrier of the catalyst is porous silicon oxide, the catalyst contains Pt nanoparticles, the Pt content of the catalyst is 0.5-10 wt%, the catalyst is modified by a sulfur-containing organic ligand, and the content of the organic ligand is 0.1-10 wt%. The preparation method comprises the following steps: impregnating porous silicon oxide into a Pt salt precursor solution by adopting a solution impregnation method, and carrying out drying, roasting and high-temperature hydrogen reduction to obtain Pt-loaded nanoparticles; the preparation method comprises the following steps: dissolving an organic ligand in an organic solvent, adding the prepared Pt-loaded nanoparticles into an organic ligand solution, and carrying out centrifugation, washing and vacuum drying to obtain the sulfur-containing organic ligand modified Pt-loaded nanoparticles. The prepared catalyst has high catalytic activity, and the target product is high in selectivity and good in stability.

This invention discloses a method for preparing phenolic chemicals by hydrogenolysis of lignin catalyzed by a cobalt-based nitrogen-carbon composite material. Using organosoluble lignin as raw material, a cobalt-based nitrogen-carbon composite material as catalyst, and a mixed solvent of small organic molecule alcohol and formic acid, the reaction is carried out under an inert gas atmosphere of 0.5–3 MPa, maintaining a reaction temperature of 210–250 °C, and a reaction time of 2–6 h. This method catalyzes the depolymerization of lignin to obtain a series of p-hydroxyphenyl products, achieving high-value utilization of lignin. The lignin conversion rate of this invention is as high as 89.6%, the total yield of monophenolic products can reach 17.7%, of which the yield of p-hydroxyphenyl products reaches 9.0%, with a selectivity of 50.8%. The catalyst preparation process used in this invention is simple and can catalyze the hydrogenolysis of lignin by short-chain alcohols and carboxylic acid solvents under mild conditions to obtain high-value-added chemicals such as p-hydroxyphenyl products.

The invention discloses a composite sulfide solid electrolyte material, a preparation method and application, and relates to the technical field of energy materials.The composite sulfide solid electrolyte material is obtained by mixing a precursor material and a quantum dot material and then conducting hot pressing sintering treatment. The quantum dot material is metal compound quantum dots or carbon quantum dots with semiconductor properties, the mass ratio of the precursor material to the quantum dot material is 100: (1-10), and the ionic conductivity, interface stability and other properties of the material are remarkably improved through introduction of the quantum dots with semiconductor properties. The prepared electrolyte material has excellent interfacial compatibility, ionic conductivity, electrochemical stability and the like, is suitable for being applied to all-solid-state soft package lithium metal batteries, effectively improves the cycling stability of the batteries, enables the batteries to keep higher capacity in the long-time use process, and prolongs the service life of the batteries.

The invention relates to the technical field of electro-catalysis, and discloses a water electrolysis hydrogen evolution method which comprises the following steps: under a water electrolysis condition, taking a water electrolysis hydrogen evolution catalytic electrode as a working electrode to carry out water electrolysis reaction; wherein the water electrolysis hydrogen evolution catalytic electrode comprises a conductive substrate and a catalytic material compounded on the surface of the conductive substrate, and the catalytic material comprises a carbon-coated platinum-based alloy nano material and conductive carbon black; wherein the carbon-coated platinum-based alloy nano material contains a platinum-metal M alloy particle inner core and a graphitized carbon layer coated on the surface of the platinum-metal M alloy particle inner core, and the metal M is selected from at least one of Ni, Co and Zn. The water electrolysis hydrogen evolution method provided by the invention has relatively low reaction overpotential and relatively high reaction activity and stability.

The invention discloses an A-site reconstruction perovskite oxide and a preparation method and application thereof, and relates to the technical field of catalysts, the perovskite oxide is a LaCoO3 / La (OH) 3 compound, and La (OH) 3 nanoparticles are uniformly embedded into the surface of LaCoO3. The A site of the perovskite oxide is reconstructed through alkoxide hydrolysis, and the inactive A site of the perovskite oxide is converted into an active center, so that the catalytic activity is remarkably improved, and a new thought is provided for future material design and heterogeneous AOPs research.

The invention discloses a bactericide composition and a preparation method thereof. The bactericide composition is prepared from the following raw materials in parts by weight: 30-40 parts of tetramycin, 50-60 parts of copper (succinate + glutarate + adipate), 30-40 parts of benziothiazolinone, 30-40 parts of dimethomorph, 25-30 parts of a modified titanium dioxide nano material, 200-240 parts of a solvent, 5-8 parts of an emulsifier, 5-8 parts of a dispersant, 5-8 parts of a wetting agent and 2-5 parts of a preservative. The titanium dioxide nano material is modified, the electronic structure of titanium dioxide is changed, the photocatalytic activity of the titanium dioxide nano material under visible light is improved, and the titanium dioxide nano material is used for exciting the antibacterial activity of active components including tetramycin, copper (succinate + glutarate + adipate), benziothiazolinone and dimethomorph, so that the bactericide composition can quickly achieve the bactericidal effect; meanwhile, the modified titanium dioxide nano material can also destroy bacterial cell membranes, so that the sterilization effect is improved.

The invention provides an electrocatalyst based on spiral carrier modified Cu monatomic and a preparation method and application thereof, and belongs to the technical field of monatomic catalytic material preparation. Chiral small molecules are used as an element structure, morphology isomerization of a composite catalyst carrier precursor is achieved, and the composite catalyst has typical spiral characteristics and has the structural potential of regulating and controlling an electrochemical microenvironment in an electro-catalysis carbon dioxide reduction reaction; by utilizing electrostatic adsorption, a metal salt is combined with a carrier precursor with an organic property, regulation and optimization of the Cu monatomic loading capacity in the spiral carrier modified Cu monatomic electrocatalyst are realized, and the preparation technology is simple and universal and is easy for industrial production; by customizing a spiral carrier for a Cu single atom, changing an electronic structure of the Cu atom and inducing electrons of a Cu atom site to be converted into a high-spin state from a low-spin state, the adsorption energy of the catalyst to a key intermediate is reduced, the activity of the catalyst in electrocatalytic carbon dioxide reduction reaction is improved, and the yield of formic acid is increased.

The present application belongs to the field of non-point source pollution treatment, and provides a method for treating non-point source pollution by using river slope. The method comprises the following steps: setting at least two guide plates at the river slope where non-point source pollution wastewater flows into the river, the upper end and the lower end of the guide plate being connected with the top and the bottom of the slope respectively, and forming a non-point source pollution treatment area between the guide plates; digging a plurality of discrete filler pits on the slope surface of the non-point source pollution treatment area, fixing filler bags containing carbon-based functional materials or environmental functional materials in the filler pits, and making the filler bags protrude from the slope surface; introducing non-point source pollution wastewater into the non-point source pollution treatment area or adding an oxidizing agent while introducing the wastewater, and the wastewater contacts with the materials in the filler bags during flowing through the non-point source pollution treatment area to realize adsorption or adsorption and degradation of pollutants. The present application provides an effective way for treating non-point source pollution, and can reduce the threat of non-point source pollution to the ecological environment of rivers.

The invention relates to a method for preparing nitrogen-doped carbon quantum dots based on reeling wastewater, which mainly comprises the steps of pretreatment of reeling wastewater, hydrothermal reaction of reeling wastewater and L-asparaginic acid, centrifugation, dialysis, drying treatment and the like to obtain nitrogen-doped carbon quantum dot solid powder. The nitrogen-doped carbon quantum dots prepared by the method are spherical, and the average diameter of the nitrogen-doped carbon quantum dots is about 9.8 nm; under ultraviolet excitation light, the nitrogen-doped carbon quantum dots obtained by the method emit blue-green fluorescence; the method is simple to operate, the fluorescence emission wavelength can be regulated and controlled based on nitrogen doping of amino acid, the emission wavelength is continuously increased along with the increase of the nitrogen content, and the fluorescence wavelength is subjected to red shift; based on the preparation technology provided by the invention, not only is the problem of reutilization of reeling wastewater solved, but also the prepared nitrogen-doped carbon quantum dots have potential application prospects in multiple fields such as biomedicine, energy, environment, electronic information, textile and the like.