1042 results about "Metal doped" patented technology

The invention discloses an alkaline battery capable of improving low-temperature discharge performance and a preparation method thereof, and the preparation method comprises the following steps: S1, preparing a positive electrode ring: preparing a positive electrode material from metal-doped composite manganese dioxide, an adhesive and a potassium hydroxide solution; s2, preparing negative electrode zinc paste, mixing and ball-milling nano zinc powder, indium powder and gallium powder into alloyed zinc powder, adding a composite conductive additive, a composite binder and a low-temperature-resistant additive, and stirring and dispersing to form the negative electrode zinc paste; s3, sleeving the positive electrode ring into the steel shell, inserting a diaphragm and injecting electrolyte; and S4, injecting negative electrode zinc paste, and packaging to obtain a finished product. According to the negative electrode zinc paste, the zinc utilization rate can be increased through nano zinc powder alloying, meanwhile, the freezing point is reduced through the low-temperature-resistant additive, and the reaction efficiency and fluidity of the negative electrode zinc paste at the low temperature are improved; ethylene glycol in the electrolyte is combined with nano zirconium dioxide, so that the stability and the ion migration capability can be improved, the discharge performance of the alkaline battery under a low-temperature working condition is improved, and the service life of the alkaline battery under the low-temperature working condition is prolonged.

The invention relates to the technical field of lithium ion batteries, in particular to a gradient-doped lithium iron phosphate positive electrode material and a preparation method and application thereof. The invention provides a gradient doped lithium iron phosphate positive electrode material, on a particle cross section of the lithium iron phosphate positive electrode material, a particle center is taken as a circle center, a distance from the particle center to a nearest surface is taken as a radius R, a concentric circle region with a radius of 0.5 R is taken as a central region, and the rest part is a surface layer region, the metal doping amount of the central region is D1, the metal doping amount of the surface layer area is D2, D1 is larger than D2, delta D is equal to D1-D2, and delta D is larger than or equal to 2000 ppm and smaller than or equal to 4000 ppm. In the obtained lithium iron phosphate positive electrode material, sufficient compaction density can be ensured, the problem of poor dynamic performance of the positive electrode material can be well solved, and the discharge performance and rate capability of the lithium iron phosphate positive electrode material are effectively improved.

A negative electrode including a negative electrode current collector; a first negative electrode active material layer on the negative electrode current collector and a second negative electrode active material layer on the first negative electrode active material layer. The first negative electrode active material layer includes a first carbon-containing active material, a first silicon-containing active material, and a first binder. The second carbon-containing active material, a second silicon-containing active material, and a second binder. The first silicon-containing active material includes a first silicon-containing compound and a first metal doped in the first silicon-containing compound. The second silicon-containing active material includes a second silicon-containing compound and a second metal doped in the second silicon-containing compound.

The invention relates to the technical field of solar cells, and provides a laminated cell and a manufacturing method thereof, which are at least beneficial to improving the efficiency of the laminated cell. The laminated cell comprises a crystalline silicon bottom cell, a middle layer and a perovskite top cell which are sequentially laminated in a preset direction, the middle layer comprises a conductive composite layer, the conductive composite layer is located on the surface, facing the perovskite top cell, of the crystalline silicon bottom cell, and materials of the conductive composite layer comprise a conductive polymer and a metal dopant; the metal grid layer is embedded into one side, far away from the crystalline silicon bottom battery, of the conductive composite layer, and the conductive composite layer exposes the surface, far away from the conductive composite layer, of the metal grid layer; the barrier layer is located on the side, away from the composite layer, of the metal grid layer and covers the surfaces of the metal grid layer and the conductive composite layer.

The invention discloses a chromium group metal doped platinum alloy catalyst as well as a preparation method and application thereof, and relates to a platinum alloy catalyst as well as a preparation method and application thereof. The technical problem that an existing alloy catalyst formed by Pt and transition metal is poor in catalytic activity and durability is solved. According to the catalyst, PtM alloy nano-particles doped with a chromium group element X are uniformly supported on a carbon carrier; in the PtM alloy doped with the chromium group element X, X exists in the form of a simple substance, and the mass percentage content of X is 5%-10%; the X-PtM / C is marked as X-PtM / C, and X is Cr, Mo or W; m is Fe, Co or Ni. The preparation method comprises the following steps: carrying out secondary reduction and high-temperature heat treatment by taking Pt / C as a precursor to obtain the catalyst. The mass activities of Cr-PtNi / C, Mo-PtNi / C and Cr-PtCo / C are respectively 0.419 A / mgPt, 0.254 A / mgPt and 0.314 A / mgPt, and are 5.0 to 8.1 times of that of Pt / C. And after the Cr-PtNi / C is aged for 30000 circles, the potential is not attenuated. The invention can be used in fuel cell field.

The invention relates to the technical field of preparation of positive electrode materials, in particular to a preparation method and application of a lithium iron phosphate material. The preparation method at least comprises a process of sintering a precursor material under a reduction condition to obtain the lithium iron phosphate material, wherein the precursor material at least comprises an iron source, a lithium source, a phosphorus source and a metal dopant, the mass ratio of the metal dopant is larger than or equal to 0, and the molar ratio of the iron element to the total phosphorus and the molar ratio of the doped metal to the total phosphorus are 0.96-0.97. According to the preparation method, generation of the iron phosphide (Fe3P, Fe2P, FeP and the like) impure phase is controlled from the burdening end by regulating and controlling the proportion of specific elements in the raw materials, so that preparation of the lithium iron phosphate material with high compaction and low iron phosphide impure phase is realized, and subsequent complicated impurity removal operation is avoided.

The invention discloses a metal-doped carbon quantum dot as well as preparation and application of the metal-doped carbon quantum dot in a nano antibacterial agent, citric acid, urea and tea polyphenol are taken as precursors, metal salt is added, carbon dot synthesis and metal ion doping are synchronously completed in one step through a hydrothermal method, and the metal-doped carbon quantum dot is prepared; the surfaces of the metal-doped carbon quantum dots are negatively charged, and the metal-doped carbon quantum dots have peroxidase-like activity and catalase-like activity at the same time; the metal ions adopt any one of Fe < 3 + >, Cu < 2 + > and Ce < 3 + >; the metal-doped carbon quantum dots are in a sphere-like shape. The metal-doped carbon quantum dots prepared by the preparation method disclosed by the invention have peroxidase-like activity and catalase-like activity at the same time through precise doping of metal ions, and the two activities have a synergistic effect in an oral periodontitis microenvironment, so that a good antibacterial effect is achieved.

The objective of the present invention is to provide a micron-sized porous sodium ferrous sulfate / carbon composite positive electrode material and a sodium-ion battery or sodium battery produced therefrom. SOLUTION: The composite material of the present invention includes a sodium ferrous sulfate / carbon composite material with and / or without metal doping elements, which is prepared by coprecipitation and solid-state calcination, and the particle size is 2-30 nm, has a porous structure, and is composed of densely packed 80-200 nm primary particles densely covered with amorphous carbon, and the surface of the micron particles is covered with a thin layer of reduced graphene to form a three-dimensional conductive network. The micron-sized particle positive electrode material has a high tap density, which is helpful in increasing the volumetric energy density of the battery, and the material has the advantages of abundant raw material reserves, low cost, high operating voltage, good rate characteristics and cycle stability as the positive electrode of sodium ion batteries or sodium batteries, and the preparation process of the material is simple. The sodium ion batteries or sodium batteries of the present invention have the advantage of high energy density and have the prospect of broad market application.

The invention discloses bimetallic MOFs / chitosan composite gel and a preparation method and application thereof, and belongs to the technical field of water body remediation materials.The bimetallic MOFs / chitosan composite gel is characterized in that MOFs adsorbent is modified through metal doping (iron doping), the structure of the MOFs adsorbent is optimized, active adsorption sites are increased, doped iron ions are combined with coordinate bonds through electrostatic attraction, and the adsorption capacity of the MOFs adsorbent is improved; the adsorption efficiency and the selectivity are improved, so that the material still shows excellent performance in a complex water body environment, and the adsorption capacity on heavy metal pollutants in mine wastewater is remarkably improved. As a transition metal which is rich in resource, low in cost and non-toxic, iron is safer and more reliable than doped with other metals. Meanwhile, cation bridge bonds can be formed between iron ions and antibiotic groups rich in electrons, and good adsorption capacity on antibiotic molecules is also shown. Therefore, the bimetallic MOFs / chitosan composite gel disclosed by the invention not only can be used for efficiently treating heavy metal ions in mine wastewater, but also can be used for simultaneously removing heavy metals and antibiotics, and is particularly suitable for simultaneously removing Cu (II) and ciprofloxacin.

The invention provides a lithium iron phosphate positive electrode material, a preparation method thereof, a positive electrode plate and a lithium ion battery. The preparation method comprises the following steps: preparing a ferrous source, a phosphorus source, an oxidant and a first pH regulator into first slurry, and carrying out first reaction on the first slurry to obtain second slurry; adding a second pH regulator into the second slurry, and carrying out a second reaction to obtain a third slurry; aging and filtering the third slurry to obtain a first precursor and a second precursor; mixing and calcining the first precursor, the second precursor and a metal doping source to obtain a third precursor; mixing the third precursor with a lithium source to obtain a fourth precursor; mixing the fourth precursor with oxalic acid, and performing secondary calcination to obtain a first product; and reacting the first product with a carbon source and a non-metal doping source to obtain the lithium iron phosphate positive electrode material. According to the invention, the preparation process of the precursor is optimized, and meanwhile, the whole preparation process of the lithium iron phosphate positive electrode material is optimized.

A semiconductor device and methods for forming the semiconductor device are described. The semiconductor device can include a top transistor and a bottom transistor arranged in a stack configuration, and an isolation layer situated between the top transistor and the bottom transistor. The top transistor can be encompassed by a high-k gate dielectric. The bottom transistor can be encompassed by a metal-doped high-k gate dielectric. A first portion of the isolation layer can be encompassed by the high-k gate dielectric. A second portion of the isolation layer can be encompassed by the metal-doped high-k gate dielectric. The metal-doped high-k gate dielectric can encompass the bottom transistor and the second portion of the isolation layer can be encompassed by a layer of first work function material (WFM). The first WFM can be encompassed by a second WFM.

An oxygen evolution reaction electrocatalyst and a method for preparing said oxygen evolution reaction electrocatalyst are disclosed. The method comprises the steps of contacting a porous zeolite with a solution containing a noble metal precursor to form a noble metal doped zeolite, pyrolyzing the noble metal doped zeolite to form nanocrystals comprising at least the noble metal and a second metal, said nanocrystals being confined within a layer of carbon-based material, wherein the second metal and the carbon-based material are derived from the pyrolyzed zeolite, and annealing said layer of carbon-based material confined nanocrystals to form isolated noble metal atoms singly dispersed within a metal oxide lattice of the second metal as an oxygen evolution reaction electrocatalyst.

The invention provides a metal doped silicon carbon negative electrode material and a preparation method thereof, and the preparation method comprises the following steps: a modified amorphous carbon material and a metal silane precursor are respectively prepared, the particle size of the modified amorphous carbon material is 7-8 [mu] m, and the internal pore size of the modified amorphous carbon material is 0.1-10 nm; the modified amorphous carbon material is placed in a chemical vapor deposition reactor, nitrogen is introduced, the temperature is increased to 500-700 DEG C, then composite gas is introduced, the deposition reaction is carried out for 100-800 minutes, a pre-product is obtained, the composite gas comprises a metal silane precursor, doping auxiliary gas and acetylene gas, and the doping auxiliary gas is used for regulating and controlling growth of sediments; and heating the pre-product to 750-850 DEG C for 10-30 minutes, cooling the pre-product to 500-600 DEG C, introducing acetylene gas again, and keeping the temperature for 30-300 minutes to obtain the metal-doped silicon-carbon negative electrode material. Therefore, the electrochemical performance and the cycle life are effectively improved.

The invention discloses a carbon nitride-based composite material as well as a preparation method and application thereof. The carbon nitride-based composite material comprises a non-metal doped carbon nitride carrier and a noble metal, wherein the noble metal exists in the carrier in an element doping form and / or is loaded on the carrier in an oxide form; the precious metal is one or more of Pt, Pd, Au and Ru, and the nonmetal is one or more of P, S and I. According to the carbon nitride composite material disclosed by the invention, noble metal is utilized to modify carbon nitride, the number of surface active sites is increased, the electron and chemical structures of an active center are adjusted, and meanwhile, generation and migration of photo-generated charges are promoted. Meanwhile, the surface of the carbon nitride composite material is modified by non-metallic elements, so that adsorption and activation of reactant H2O molecules are effectively promoted. The catalyst disclosed by the invention is simple in preparation process, good in repeatability and easy for large-scale production.

The invention relates to a hollow mesoporous carbon sphere prepared based on a confinement polymerization method and a preparation method of a platinum alloy catalyst loaded by the hollow mesoporous carbon sphere and doped with rare earth metal. The method comprises the following steps: by taking mesoporous silica as a template, introducing an initiator and a small molecular organic matter precursor into mesopores, and carrying out confinement polymerization in the mesopores to obtain a silica / polymer composite; carrying out high-temperature calcination and etching treatment on the complex to obtain hollow mesoporous carbon spheres; the carbon sphere is used as a carrier to load a platinum alloy doped with rare earth metal. The hollow mesoporous carbon spheres prepared by the method have good spherical morphology and mesoporous channels and high specific surface area, and the problems of non-uniform morphology, unobvious mesopores and the like in a traditional method are solved. After platinum alloy particles doped with rare earth metal are loaded on the carbon spheres, the problems of agglomeration, wide particle size distribution, poor performance and the like of the platinum alloy particles are solved.

The invention relates to the technical field of preparation of lithium iron phosphate positive electrode materials, and discloses a method for preparing modified lithium iron phosphate through carbon-coated metal doping and positive electrode lithium supplementation, which comprises the following steps: S1, dissolving Li3PO4 powder, adding a Fe2SO. 7H2O aqueous solution into the solution, stirring and drying to obtain a LiFePO4 precursor; s2, testing the element content of the precursor; s3, supplementing a lithium source and a phosphorus source to the precursor, adding a carbon source and metal salt, and uniformly mixing; s4, the precursor mixed solution is put into a sand mill to be subjected to sand milling for 60-120 min to be fully mixed; s5, performing spray drying on the sanded precursor, and collecting a product; and S6, calcining and carbonizing the product to obtain the active substance. S7, dissolving the active substance, and magnetically stirring and mixing; and S8, performing coating and vacuum drying on the mixed slurry, and performing half-cell manufacturing and electrochemical performance testing. The crystal stability is improved, and the battery life is prolonged.

The invention discloses a preparation method of a noble metal doped ultrathin hydroxide nano-cluster type electro-catalytic material, and relates to a preparation method of a noble metal doped hydroxide electro-catalytic material. The invention aims to solve the technical problems of high cost, complex preparation process and no environmental protection of the existing electro-catalytic material. The method comprises the following steps: putting foamed nickel into a mixed solution of persulfate and transition metal salt for hydrothermal reaction to obtain an intermediate; and putting the intermediate into a noble metal salt solution for hydrothermal reaction to obtain the noble metal doped ultrathin hydroxide nano-cluster type electro-catalytic material. The prepared material has an ultrathin nano-cluster structure, and is high in electron transmission rate and hydrogen evolution reaction rate. In a 1M KOH aqueous solution, the overpotential is 68-98mV under 10mA. Cm <-2 >, the Tafel slope is 96.8-112.3 mV dec <-1 >, and the composite material can be used in the field of hydrogen production by electrolyzing water.

The invention provides a non-metal-doped transition metal-coated biomass porous carbon sphere photothermal conversion material and an integrated CO2 photothermal continuous trapping system and method, and belongs to the technical field of CO2 trapping. According to the invention, biomass porous carbon spheres are used as a catalytic functional unit, the carbon spheres have good absorption and conversion capability on solar spectrum, and transition metal is coated on the basis, so that the light absorption capability and the photothermal conversion capability are further enhanced; by introducing P, S and N non-metallic elements for doping, the crystal configuration of the original material can be changed, the energy band structure of the material can be adjusted, the light absorption capacity and the photothermal conversion capacity of the material are further improved, the carbon-based material is applied to alcohol amine solution CO2 trapping equipment, the mass transfer process of absorption liquid in the absorption process can be accelerated, and in the desorption process, the absorption efficiency is improved. Light energy can be converted into heat energy by means of the photo-thermal conversion effect, energy exchange is conducted between the heat energy and rich liquid in a local micro area (the surfaces of the doped carbon-coated metal particles), energy is provided for the desorption process of CO2, and therefore CO2 desorption heat absorption is compensated, and energy consumption is further reduced.

The invention discloses a preparation method of a cell membrane modified ultrasonic response type copper / ferroptosis activated nano-carrier. The nano-carrier is used for in-vivo and in-vitro treatment of ultrasonically activated tumors. The carrier is used as an ultrasonic activation type copper / iron death activator, and breast cancer cell membrane doped lipid is coated on the outer layer of a copper-iron bimetal organic framework to form nanoparticles with a core-shell structure. The biomimetic copper / ferroptosis activated nano-carrier disclosed by the invention is mainly characterized in that (1) the in-vivo circulation time of the nano-carrier is prolonged by modification of a breast cancer cell membrane, and accumulation of the nano-carrier in breast cancer cells and tissues is improved by virtue of homologous targeting of the nano-carrier; (2) the copper-iron double-metal-doped metal organic framework has a uniform nano structure, and has the potential of effectively catalyzing Fenton / Fenton-like reaction activity and activating a copper / iron death synergistic effect in cells; and (3) depending on the sound-sensitive agent and the oxygen carrier which are loaded by lipid, the nano-carrier has an ultrasonic signal response release behavior, and can simultaneously activate a sonodynamic effect, a copper death process and an iron death process in tumor cells, so that accurate and efficient killing of tumor tissues is realized.

The invention discloses a hydrogel-based water-energy-resource co-production solar evaporator and application thereof, and belongs to the technical field of chemistry and environment, the hydrogel-based water-energy-resource co-production solar evaporator is prepared by taking sodium alginate hydrogel as a matrix, adding carbon nanotubes and a titanium-based lithium ion sieve or a metal-doped titanium-based lithium ion sieve into a solution of the sodium alginate hydrogel, taking polyurethane sponge as a carrier frame, and preparing the hydrogel-based water-energy-resource co-production solar evaporator. Ca2 + is adopted as a cross-linking agent to construct a solar evaporator with a flexible size (centimeter-level to meter-level components can be prepared according to application scenes), the solar evaporator is used for the solar driven evaporation process of lithium-containing water resources such as salt lake seawater, and Li + selective enrichment, fresh water collection and waste heat power generation are synchronously achieved. Moreover, the evaporator has the characteristics of simple preparation process, low cost and excellent environmental compatibility, also has a good removal effect on salt ions, and keeps stable fresh water collection performance in a long-time operation process.

The invention discloses a preparation method of a metal-doped cobalt-based oxide material, which comprises the following steps: metal nitrate is dissolved in glycerol and isopropanol, a solvothermal method is adopted for reaction to obtain a reaction product, the metal in the metal nitrate comprises cobalt and at least one of nickel, copper, iron or molybdenum, the concentration of cobalt nitrate in the dissolved solution is 0.001-0.05 mM, and the concentration of cobalt nitrate in the solution is 0.01-0.05 mM; the concentration of metal nitrate except cobalt is 0.1-1 mu M; the reaction product is subjected to high-temperature calcination, the metal-doped cobalt-based oxide material with the microstructure being nanospheres with rough surfaces is obtained, the reaction temperature of the solvothermal method is 120-180 DEG C, and the reaction time is 3-6 h. The invention also discloses the metal element doped cobalt-based oxide material obtained by the preparation method and application of the metal element doped cobalt-based oxide material in electrocatalytic nitrate reduction synthesis of ammonia. The preparation method provided by the invention is simple, and the prepared metal-doped cobalt-based oxide material shows excellent electrochemical performance when applied to electrocatalytic nitrate reduction synthesis of ammonia.

The invention provides a preparation method of a metal-doped sodium titanate negative electrode material, which comprises the following steps: S1, preparation of a hydrolysis solution: dissolving titanyl sulfate and metal A sulfate in water to serve as the hydrolysis solution, the molar ratio of A to Ti being (0.01-0.5): 1; s2, preheating a base solution, namely adding a proper amount of deionized water into a reaction kettle, and preheating to 80-110 DEG C; s3, hydrolysis: in a stirring state, adding a hydrolysis solution into the reaction kettle at a constant speed, and keeping the temperature of a system in the reaction kettle constant; s4, preparing metatitanic acid: cooling the hydrolyzed slurry to room temperature, washing with water, and drying to obtain metal-doped metatitanic acid; and S5, preparing sodium titanate: uniformly mixing a sodium source and the metal-doped metatitanic acid according to the molar ratio of sodium to titanium of 2: 3, calcining in an argon atmosphere, and naturally cooling to obtain the metal-doped sodium titanate. The metal-doped sodium titanate prepared by the method is low in cost, simple and feasible in process and excellent in product performance.

The invention discloses a silicon-based negative electrode material as well as a preparation method and application thereof. The silicon-based negative electrode material comprises porous zeolite, and silicon and non-metal doping elements deposited in pores of the porous zeolite, wherein the material of the non-metal doping element comprises one or more of B, P, S, N, C, As and Te; the mass of the non-metal doping element accounts for 0.5%-15% of the total mass of the silicon-based negative electrode material; the mass of silicon accounts for 50-80% of the total mass of the silicon-based negative electrode material; when the silicon-based negative electrode material disclosed by the invention is applied to the lithium battery, the lithium battery can have relatively low volume expansion rate, relatively high specific capacity and good conductivity and cycle performance.

A flexible pH sensor and a measurement system, belonging to the technical field of sensors. Using a material that does not react with an electrolyte, mixed with a metal, an anode substrate is printed, and by means of an electrochemical method, one-step synthesis of a metal-doped polyaniline composite material is implemented. By means of controlling the metal content, the doping amount of metal ions in the polyaniline can be changed. Adding metal increases the conductivity of the anode substrate, which facilitates deposition of polyaniline. The one-step method for preparing a polyaniline composite material is simple, low-cost, and pollution-free; compared with pure polyaniline, the composite material has improved sensitivity. The metal-doped polyaniline composite material is used in a pH sensor for the first time, thus implementing a wide pH measurement range (2-12) and a high bending stability. The flexible pH sensor can be used in saliva pH measurement, and to measure the freshness of fresh food.

The invention provides a metal M-doped layered Cu-based catalyst as well as a preparation method and application thereof. According to the invention, copper salt, zinc salt, aluminum salt and metal M salt are used as raw materials, and the active metal Cu in the prepared catalyst is highly dispersed and still keeps an intercalation structure through the controllable characteristics of element composition, structural topological transformation and the like of the metal M doped layered Cu-based catalyst. Besides, through doping of different metals M, a metal-carrier interface structure, oxygen vacancy concentration and quantity, alkaline sites, Cu metal size and the like in the catalyst are changed, so that the catalytic activity is improved. Moreover, Cu in the metal M-doped layered Cu-based catalyst prepared by different methods is good in dispersity, and when the metal M-doped layered Cu-based catalyst is used for preparing methanol through COx (x = 1 and / or 2) hydrogenation, the metal M-doped layered Cu-based catalyst has excellent stability, catalytic activity and relatively high selectivity, and can be popularized and applied to various heterogeneous catalytic reaction fields such as hydrogenation, dehydrogenation and the like.

A method of forming a metal interconnect in a semiconductor structure includes performing a barrier layer deposition process to deposit a barrier layer within an opening formed through a dielectric layer, performing a liner deposition process to deposit a liner layer on the barrier layer, performing a metal treatment process to implant metal dopants into a surface of the liner layer, and performing a gap fill process to form a metal interconnect on the metal treated surface of the liner layer within the opening.

An optical component includes a substrate and an anti-reflective film. The substrate has an aspherical surface through which light passes. The anti-reflective film is disposed at least on the aspherical surface and includes a nanostructure layer and an intermediate layer. The nanostructure layer includes ridge-like protrusions that are non-directionally extended. A bottom of the ridge-like protrusions is closer to the substrate than a top of the ridge-like protrusions. The ridge-like protrusions gradually taper from the bottom toward the top. An average structural height of the ridge-like protrusions ranges from 108 to 368 nm. The intermediate layer is between the nanostructure layer and the substrate. A main component of the nanostructure layer is aluminum oxide. The nanostructure layer includes a metallic doping agent at least partially distributed inside the ridge-like protrusions. The metallic doping agent includes at least one of titanium, vanadium, chromium, titanium oxide, vanadium oxide, and chromium oxide.

The invention discloses a method for degrading organic pollutants in a water body by using modified goethite reinforced ferrate, the method comprises the following steps: adding modified goethite into a degradation system constructed by ferrate to degrade the organic pollutants in the water body, and the modified goethite is prepared by calcining metal-doped goethite as a raw material. The doped metal in the metal-doped goethite is cobalt and / or copper. According to the method, the ferrate is activated by the modified goethite with rich oxygen vacancies and surface activity Fe (II) sites, so that the ferrate can be promoted to quickly generate a large number of strong-activity species, a catalytic degradation system taking high-valence metal as a main component is constructed, and organic pollutants can be efficiently degraded under the condition that the dosage of the ferrate is less; the method can realize efficient removal of various organic pollutants in water, has the advantages of strong degradation selectivity, high degradation efficiency, good removal effect, less catalyst and oxidant dosage, no secondary pollution and the like, and has high use value and good application prospect.

The invention discloses a three-dimensional metal-doped molybdenum disulfide-based nano-enzyme and a preparation method and application thereof, and belongs to the field of nano-enzyme catalysis, the nano-enzyme is of a three-dimensional flower-shaped structure, has extremely strong affinity to hydrogen peroxide, presents superstrong peroxidase-like performance, and also shows glutathione (GSH) consumption activity, so that the nano-enzyme can be used for preparing the nano-enzyme. The preparation method is simple, effective, low in cost and easy for large-scale industrial application, a molybdenum source, a sulfur source and a metal source are dissolved in a deionized water solvent, a precipitate is generated through a heating reaction, the precipitate is separated, and the three-dimensional metal-doped molybdenum disulfide-based nano-enzyme is obtained. The obtained nano-material has a good treatment effect and a potential application prospect in the aspect of nano-enzyme catalysis.

The invention relates to the technical field of photocatalysis, in particular to a Ni / Ga bimetal doped g-C3N4 nanotube composite material as well as a preparation method and application thereof. The Ni / Ga bimetal doped g-C3N4 nanotube composite material with the nitrogen vacancy is formed by doping Ni and Ga bimetals into the g-C3N4 nanotube and calcining the g-C3N4 nanotube in the air atmosphere to introduce the nitrogen vacancy. Nitrogen vacancies and double metal doping synergistically improve the efficiency of photocatalytic hydrogen production, because the Ni / Ga double metal doped g-C3N4 nanotube composite material with the nitrogen vacancies has a wider visible light absorption range, a lower carrier recombination rate, a higher electron transfer rate and higher stability, the composite material further has higher hydrogen production efficiency.