44 results about "Carbon source" patented technology

A method for preparing a silicon carbide ceramic material with low residual silicon by adopting a multi-step reaction sintering method comprises steps as follows: carbon sources are selected, the carbon sources with different activity degrees are mixed with silicon carbide powder, phenolic resin or PVA (polyvinyl acetate) is added, the materials are mixed and subjected to powder forming, siliconizing sintering and heat treatment for removing residual silicon, finally, an obtained silicon carbide product is polished, carbon and silicon condensed on the surface are removed, the coarse surface is flattened, and a qualified silicon carbide finished product is obtained. According to the method, the problem that application of a conventional reaction sintered silicon carbide ceramic material in high temperature and corrosion environments and a high temperature difference environment is limited due to higher content of residual silicon is solved, the silicon carbide ceramic material with low residual silicon and high density can be prepared, heat-conducting property, high-temperature mechanical property, Young modulus, corrosion resistance, high-temperature conductivity and other properties of the reaction sintered silicon carbide material are greatly improved, and the application range of the reaction sintered silicon carbide material is greatly enlarged.

The invention relates to a method for coating an even and controllable deposit carbon layer on the surface of LiFePO4 particles serving as lithium ion battery cathode materials for increasing the LiFePO4 conductivity. The method adopts the concrete preparation processes that: LiFePO4 powders are placed in a constant temperature zone of a chemical vapor deposition furnace, then the air in the furnace is fully discharged for inputting inert gases, after the temperature rises to the set level, a carbon source gas is input for covering a conductivity carbon film on the surface of the LiFePO4 particles evenly, the LiFePO4 coated with the carbon film has excellent conductivity which is increased by five orders of magnitude compared with the condition before coating. The chemical vapor deposition temperature ranges from 580 to 720DEG C, the deposition time is from 1 to 10 hours, and the volume percent of the carbon source gas is between 1 and 20 percent, and a sample deposited with carbon is cooled to the room temperature with a natural furnace and is then taken out. The method can cover the conductivity carbon film on the surface of each LiFePO4 particle evenly for increasing the conductivity of LiFePO4, and the thickness of the conductivity carbon film can be accurately controlled in the range of 2 to 50 nanometers through adjusting parameters (deposition temperature, deposition time and carbon source gas volume percent) of the chemical vapor deposition process.

The invention belongs to the technical field of a refractory castable, and particularly relates to a castable for a blast-furnace tapping channel and a preparation method thereof. The castable comprises the following components: 55-80wt% of fused brown corundum, 8-21wt% of silicon carbide, 0.01-5wt% of carbon source, 2-8wt% of alpha-alumina micro powder, 1-7wt% of fused white corundum, 0.5-5wt% of silica powder, 1-5wt% of calcium aluminate cement, 0.3-4wt% of elemental silicon powder, 0.01-0.4wt% of water reducing agent, 0-0.2wt% of organic fibers and 0-0.2wt% of aluminum powder. The preparation method comprises the steps of dry-blending the components for 10-180 seconds, additionally adding water accounting for 4-6wt% of the raw materials, and stirring for 1-8 minutes so as to obtain the castable. Carbon nanotubes are introduced to the castable for the tapping channel so as to partially or totally replace spherical asphalt and be uniformly distributed in the castable, and can be filled into tiny gaps so as to improve the compactness of the castable, so that the anti-erosion and anti-scouring properties of the castable are improved, toxic smog formed in the process of baking the spherical asphalt is reduced, and the body injury of workers and the environmental pollution caused by the toxic smog are reduced; the castable has the characteristics of excellent properties, long service life and environmental friendliness.

The invention belongs to the technical field of adsorbing agents and relates to a method for preparing a carbon adsorbing material used for efficiently removing harmful ions from waste water. The method comprises the following step: on the basis of taking the soluble saccharide or furfural as a carbon source and the amino acid or compound containing sulfydryl, carboxyl or amino group as an additive, performing the hydro-thermal reaction on the carbon source and the additive at 160-220 DEG C, thereby generating the carbon solid adsorbing material. The adsorbing material can be used for processing heavy metal ions or transition metal ions in industrial effluent and domestic sewage and the processing effect is excellent. The method has the advantages that the soluble saccharide or furfural is used as a raw material for preparing the carbon solid adsorbing material, the cost of the raw material is low, the preparation process is simple, the solid adsorbing material is synthesized through one step of hydro-thermal reaction, the reaction condition is mild and controllable, and the solid adsorbing material prepared by using the method has excellent stability and contains a large amount of surface groups. The content of the surface groups can be controlled within a large scope without changing the reaction condition. The surface groups have strong interaction with the metal ions, such as sulfydryl and mercury ions, so that the carbon adsorbing material can be used for efficiently removing the harmful ions.

The invention discloses a preparation method of a porous diamond film. The preparation method of the porous diamond film comprises the following steps: putting a silicon substrate into a microwave-plasma chemical vapour deposition device, wherein a Pt metal film is plated on the surface of the silicon substrate as a catalyst; controlling the vacuum degree to be 10-30 millibars, introducing a working gas, loading a carbon source to a microwave-plasma generating region, and heating to 750-850 DEG C; depositing to obtain a blocky diamond film; calcining the film in the air atmosphere at the temperature of 500-600 DEG C, thus obtaining the porous diamond film. The preparation method of the porous diamond film has the advantages that no template is needed, no complex pre-treatment process or high temperature process is needed, metal pollution can be avoided, and a treatment process is further simplified.

The invention belongs to the energy material technique field, especially relates to a method for preparing lithium iron phosphate/carbon composite material as an anode material of a lithium ionic cell. The invention synthesizes the lithium iron phosphate by using an iron oxide hydroxide as an iron source, which is not seen at home and abroad. The synthesis process of the compound comprises: mixing the iron oxide hydroxide and a lithium salt, a phosphate salt according to a stoichiometric ratio, adding proper amount of carbon sources and liquid ball milling medium and ball milling the mixture, reacting the dried mixture at a certain temperature, finally getting the lithium iron phosphate/carbon composite material. The products from the invention have advantages of high purity, good crystallization, high capacity and good circulation performance under a high/low rate based on the electrochemistry property testing.

The invention discloses a phosphor-silicon-containing aggregated flame retardant and a preparation method thereof. The preparation method comprises the following steps: adding 10-(2,5-dihydroxy phenyl)-9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and an acid-binding agent into a reactor loaded with a burette, a condensing tube and a nitrogen protection device, heating to 40 to 100 DEG C; weighing R1, R2-dichlorosilane, adding a solvent, and adding the mixture into the burette; adding the mixture at the temperature of 40 to 100 DEG C dropwise, and performing a thermal reaction for 2 to 10 hours after finishing of dropping; adding a precipitant, performing suction filtration, washing filter cakes with the precipitant, and drying to obtain the phosphor-silicon-containing aggregated flame retardant. The phosphor-silicon-containing aggregated flame retardant has high phosphor content and silicon content, abundant carbon sources, high char forming characteristic, superior flame retardance and thermal stability, and can be applied to high-molecular materials such as flame-retardant polypropylene, polystyrene and epoxy resin.

The invention provides a single-crystal lithium nickel cobalt manganese oxide composite material and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing a ternary precursor, a lithium salt and a cosolvent in a mixer according to a preset ratio; calcining the mixed material in an oxygen-enriched atmosphere, cooling, crushing the cooled material, sieving, and removing iron to obtain a single crystal lithium nickel cobalt manganese oxide material; uniformly mixing the prepared material with a carbon source and a metal oxide in a ball mill accordingto a preset proportion; and calcining the mixed material in an inert atmosphere, cooling, crushing the cooled material, sieving the cooled material, and removing iron to obtain the carbon and metal oxide composite coated single crystal lithium nickel cobalt manganese oxide composite material. According to the single-crystal lithium nickel cobalt manganate composite material and the preparation method thereof, the preparation process is simple, and the prepared material is stable in structure and excellent in rate capability and has excellent cycle performance and conductivity.

The invention provides a metabolic pathway for bio-converted methyl alcohol. The metabolic pathway for methyl alcohol is artificially constructed in escherichia coli. The metabolic pathway is simple and can enter into the central metabolic pathway of the escherichia coli within two steps. The key enzyme, namely, formaldehyde lyase (formolase) on the pathway is subjected to orthogenesis, the beneficial mutant clone is acquired in the manner of screening through whole-cell catalysis, the enzyme activity of the formaldehyde lyase is increased, the related gene on the metabolic pathway is assembled for acquiring methyl alcohol, the engineering bacteria is utilized to culture in a culture medium taking methyl alcohol as a unique carbon source and the efficient utilization of the methyl alcohol is realized in the manners of optimizing culture medium and knocking out gene.

The invention discloses an efficient liquid sodium acetate carbon source for degrading ammonia nitrogen in wastewater. The efficient liquid sodium acetate carbon source is prepared from sodium acetate, glacial acetic acid, sodium carbonate, ethyl alcohol, glucose and deionized water. The efficient liquid sodium acetate carbon source is prepared through the following steps: uniformly mixing sodiumacetate and glacial acetic acid, adding a part of deionized water, stirring to obtain a solution 1; taking sodium carbonate, adding a part of deionized water, and stirring to obtain a solution 2; taking glucose, adding a part of deionized water, and stirring to obtain a solution 3; and mixing the solution 1, the solution 2 and the solution 3, sequentially adding ethyl alcohol and the rest of deionized water, and uniformly stirring to obtain the efficient carbon source (liquid sodium acetate) for degrading ammonia nitrogen in wastewater. The efficient liquid sodium acetate carbon source has thebeneficial effects that sodium acetate is harmless to a human body, is low in cost, is easily absorbed and used by microorganisms, and is an ideal external carbon source; glacial acetic acid can externally increase a carbon source, and the pH value is maintained in the sewage treatment process; and sodium carbonate can provide an inorganic carbon source for a part of microorganisms.

The invention discloses a method for culturing oleaginous microalgae. The method comprises the steps of: inoculating the oleaginous microalgae at a logarithmic growth period into a culture medium containing an organic carbon source, culturing under the alternative circulation environment of irradiation and no irradiation, and culturing until at a platform period. According to the method, cultivation is performed under the alternative circulation environment of irradiation and no irradiation, so that the important role for fixing carbon dioxide is also taken into account while the biomass and lipid yield is guaranteed, and the period of microalga cultivation is greatly shortened.

The invention discloses a method for preparing a graphene chemically modified electrode through in-situ growth, which mainly comprises the following steps: (A) substrate cleaning; (B) in-situ growth of graphene: placing the substrate obtained by the step (A) in a clean quartz boat, and placing the quartz boat in a quartz tube of a horizontal resistance furnace; introducing argon to remove oxygen in the quartz tube; under the protection of the argon, heating the quartz tube to the growth temperature of graphene; preserving heat for 1-180 minutes while introducing carbon source gas and hydrogen instead; then, cooling to room temperature under the protection of argon, and taking out a product to obtain a substrate with in-situ grown graphene; (C) connecting the substrate with graphene of in-situ growth, obtained by the step (B), with a wire or directly putting the substrate into a clamp to obtain the graphene chemically modified electrode. The preparation process of the method is simple, the preparation efficiency is high, and the method is suitable for large-scale production; the prepared graphene chemically modified electrode has good quality and excellent detection performance.

The invention belongs to the technical field of quantum dot luminescent materials and in particular discloses a method of preparing carbon quantum dots with high quantum yield in an oil phase. The method comprises the following steps: carrying out pyrolysis on a carbon source in an octadecene solution, carrying out modification by adding a surface modifier to obtain carbon dots, and carrying out separation and purification. The method is simple in operation, mild in condition and low in cost and is green and environmentally friendly. According to the method disclosed by the invention, a carbon quantum dot system prepared by the method is good in water solubility and stability and high in quantum yield.

The invention provides a high-adsorption polylactic acid composite biofilm carrier material, which is prepared from the following raw materials by weight: 8-10 parts of diatomaceous earth, 14-18 partsof polylactic acid, 0.3-0.4 part of graphene oxide, 4-6 parts of cassava starch, 2-3 parts of gum arabic, 40-50 parts of polypropylene, 8-12 parts of chitosan, 2-4 parts of nanometer carbon sol, 3-5parts of lignocellulose, 1-2 parts of bentonite, 1-2 parts of hexadecyl trimethyl ammonium bromide, 0.5-1.5 parts of silica sol, 0.3-0.5 part of sodium humate, and 15-20 parts of water. The inventionfurther provides a preparation method of the high-adsorption polylactic acid composite biofilm carrier material. According to the present invention, the high-adsorption polylactic acid composite biofilm carrier material has advantages of light weight, large surface activation area, rich carbon source and low influence of environmental temperature change on adsorption performance; and the filler prepared from the high-adsorption polylactic acid composite biofilm carrier material has advantages of good fluidity, less agglomeration, good adsorption performance, corrosion resistance, duration, high efficiency and the like so as to further improve the water purification effect.

The invention discloses an accurate phosphorus removal and dosing system for a sewage treatment plant. The system comprises a sewage treatment facility, a chemical dosing facility, a water quality andquantity monitoring instrument and a control device, wherein the sewage treatment facility comprises a water inlet pump room, an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank, a middle lifting pump room, a reaction tank, a sedimentation tank, a filter tank and a water outlet channel which are connected in sequence; the chemical dosing facility comprises an anaerobic tank carbon source adding facility, an aerobic tank phosphorus removing agent adding facility and a reaction tank phosphorus removing agent adding facility; the water quality and quantity monitoring instrument comprises a water inlet total phosphorus online monitor, a water inlet electromagnetic flowmeter, a secondary sedimentation tank water outlet orthophosphate online monitor, a deep waterinlet electromagnetic flowmeter and a water outlet total phosphorus online monitor; the lift pump, the chemical dosing facility, and the water quality and quantity monitoring instrument of the systemare all connected with a control device; according to the system, biological phosphorus removal, synchronous chemical phosphorus removal and rear chemical phosphorus removal are organically combined,accurate addition of a phosphorus removal agent is achieved, the sewage phosphorus removal effect is improved, the phosphorus removal cost is reduced, meanwhile, the automation level of a sewage plantcan be improved, and the manual operation intensity is reduced.

The invention relates to a nutrient slow-release biological soil conditioner, which comprises the following main raw materials: a humiccompound, cassava residues, a foam material, a fermentation strain, and water, wherein except the water, in percentage by weight, the soil conditioner comprises 35-45% of the humiccompound, 45-55% of the cassava residues, 5-10% of the foam material, and 1-5% of the fermentation strain, and the water is used for diluting the fermentation strain and a mixed material. The nutrient slow-release biological soil conditioner produced by using the production method disclosed by the invention is taupe particles; and because main carbon sources and nitrogen sources are wrapped with foams formed by the foam material, and through thorough fermentation, the survival time of active microbes in the sources under extreme conditions is long, and metabolic products can be sustainably provided, thereby increasing the activity period of the soil conditioner, and effectively improving the microcirculation of soil.

The invention provides a reinforced regenerated surface porous material, a preparation method and application thereof, and a device for preparing the reinforced regenerated surface porous material, and belongs to the technical field of surface porous material utilization. The method comprises the following steps that: a regenerated surface porous material is soaked in a carbonate solution to be pretreated, so that a pretreated material can be obtained; the pretreated material is dried, so that a dried pretreated material can be obtained; microorganisms, a microorganism cementation substrate and an oxygen release agent are mixed, so that microorganism mixed feed liquid is obtained, wherein the microbial cementation substrate is obtained by mixing a carbon source, a nitrogen source, a calcium source and water; the dried pretreated material is soaked in the microorganism mixed solution under a vacuum condition, and then reinforcement treatment is performed on the obtained soaked materialunder a standing condition to obtain the reinforced regenerated surface porous material. The reinforced regenerated surface porous material prepared by the method provided by the invention is low in porosity and water absorption, high in strength and good in quality stability; the reinforced regenerated surface porous material has self-repairing performance when being used as an aggregate for preparing a cement-based material.

The invention discloses a method and a device for synchronously and efficiently removing nitrogen and phosphorus from low C/N domestic sewage by using an internal carbon source through a single-stage sequencing batch reactor, and belongs to the field of domestic sewage treatment. After domestic sewage enters the integrated short-cut nitrification endogenous short-cut denitrification phosphorus removal coupled anaerobic ammonia oxidation SBR reactor, an organic carbon source in the domestic sewage is converted into an internal carbon source in bacteria in a front anaerobic section, and the phosphorus release process is also completed; in the low-oxygen aeration stage, the phosphorus-accumulating bacteria absorb a part of phosphate in the sewage, and the ammonia-oxidizing bacteria oxidize ammonia nitrogen in a part of raw water into nitrite; and finally, in the anoxic section, part of nitrite and part of residual ammonia nitrogen generated in the aerobic section are converted into nitrogen by anaerobic ammonia oxidizing bacteria, the generated nitrate nitrogen is reduced into nitrite by denitrifying phosphorus-accumulating bacteria and denitrifying glycogen-accumulating bacteria, and the denitrifying phosphorus-accumulating bacteria further absorb phosphate. According to the method, the carbon source in the raw water is fully utilized to realize synchronous nitrogen and phosphorus removal of the low C/N domestic sewage, the ineffective loss of the carbon source is reduced, the energy consumption is reduced, and the sludge yield is relatively low.

The invention discloses a synchronous denitrification reactor. The synchronous denitrification reactor comprises a first order reaction chamber, a second order reaction chamber, a inlet water mixing chamber, a carbon source adding pipe, a mixing stirring device, a backwash water pipe, and a spherical filling material; the first order reaction chamber and the second order reaction chamber are connected in series; the first order reaction chamber comprises a first water preparation oxygen release chamber and a fist denitrification chamber; the second order reaction chamber comprises a second water preparation oxygen release chamber and a second denitrification chamber; the bottoms of the first denitrification chamber and the second denitrification chamber are designed to be tapered; the bottom of the first denitrification chamber is provided with a hole; the bottom of the second denitrification chamber is provided with a hole; the outside edge of each of the holes is covered with filling material blocking screen; and the spherical filling material is injected into the first denitrification chamber and the second denitrification chamber. According to the synchronous denitrification reactor, synchronous denitrification anoxic conditions are achieved in an aerobic tank or an anoxic pool via insulation, biomembrane loaded with the spherical filling material is used for reaction of nitrates and nitrites in backflow sewage with the added carbon source, and generated nitrogen overflow, so that denitrification is realized.

The embodiment of the invention discloses a silicon monoxide composite material, a preparation method thereof and a lithium ion battery, and the preparation method comprises the following steps: introducing a protective gas into a vapor deposition furnace, and preheating a silicon monoxide raw material at the same time, so that part of the silicon monoxide raw material is subjected to a disproportionation reaction; and continuously introducing protective gas and carbon source gas, and carrying out chemical vapor deposition on the preheated silicon monoxide raw material so as to form the carbon nanotubes on the surface of the silicon monoxide. According to the embodiment of the invention, the carbon nanotube can be catalytically grown on the surface of the silicon monoxide through the in-situ self-generated catalyst, the conductivity and the first coulombic efficiency of the silicon monoxide are improved, and the preparation process is simple.

The invention provides preparation methods of high-specific-surface-area nano W powder and high-specific-surface-area nano WC powder. The preparation method of the high-specific-surface-area nano W powder comprises the steps that blue tungsten powder serves as a raw material, reverse hydrogen reduction is adopted, a heating zone of a hydrogen reduction furnace is divided into a low-temperature zone, a medium-temperature zone and a high-temperature zone, the temperature of the low-temperature zone is set to be 500-800 DEG C, the temperature of the medium-temperature zone is set to be 600-900 DEG C, the temperature of the high-temperature zone is set to be 700-1000 DEG C, and reaction time is 5-9 h. According to the preparation method of the high-specific-surface-area nano WC powder, the high-specific-surface-area nano W powder prepared through the method and a carbon source serve as raw materials, the reaction temperature is set to range from 900 DEG C to 1300 DEG C, and the reaction time ranges from 2 h to 6 h. The BET value of the nano W powder obtained through the method reaches 25.55 m<2>/g, and the BET value of the nano WC powder obtained through the method is larger than 4.0 m<2>/g.

The invention relates to a preparation method of a nitrogen-doped porous carbon material, wherein the preparation method comprises the following steps: under gas protection, carrying out thermal decomposition on ethylenediamine tetraacetate and a pore-forming agent in a weight ratio of (0.25-5):1 at the temperature of 500-800 DEG C, removing impurities, and thus obtaining the nitrogen-doped porouscarbon material nano material. The embodiment of the invention provides the preparation method of the nitrogen-doped porous carbon material, ethylenediamine tetraacetate is adopted as a carbon sourceand a nitrogen source, ethylenediamine tetraacetate has carboxyl, and gas is generated by carboxyl at high temperature; a nitrogen source is introduced in a chemical bond combination mode, and afterthe porous carbon material is doped with nitrogen, the conductivity of the carbon material and the wettability of an electrolyte can be improved; gas is generated during carbonization reaction of a pore-forming agent, so that the energy storage capacity is improved; the preparation method is simple in process, low in cost and small in subsequent treatment pollution, and the nitrogen-doped porous carbon material has the advantages of high specific surface area, excellent conductivity, high nitrogen doping amount and the like.

The present invention relates to a carbon nanotube fiber and methods for preparing the same. In one embodiment, a method for preparing a carbon nanotube fiber comprises reacting a carbon source in the presence of a catalyst and a catalytic activator to form carbon nanotube aggregates, contacting the carbon nanotube aggregates with graphene oxide, and forming the carbon nanotube aggregates in contact with the graphene oxide into a carbon nanotube fiber.

The invention discloses a preparation method for solar blind type deep ultraviolet plasma resonance nanoparticles. A laser liquid phase ablation device is adopted. A laser liquid phase ablation methodis used for preparing metal nanoparticles with a local area surface plasma resonance effect; the preparation method is simple; and a reaction product is pure, so that impurities are not easily introduced. Ascorbic acid is introduced as a carbon source, so that the metal nanoparticles can be wrapped with a carbon layer with a certain thickness, and the stability and oxidation resistance of the product can be effectively improved. The experimental controllability is high. By adjusting laser energy and ablation time, the particle size and the oxidation degree of the metal nanoparticles can be regulated and controlled. The prepared metal nanoparticles can be used for enhancing the light absorption of light (240-260nm) in the extremely deep ultraviolet waveband.

The invention discloses septic equipment for raising rabbits. The septic equipment solves the problem of troublesome operation caused by the facts that an existing rabbit raising fermentation bed needs to add water irregularly, and flora and carbon sources need to be replenished regularly. The septic equipment comprises a cage body at the upper portion and a fermentation plate at the lower portion, sawn wood power, the flora and biodegradable spheres scattered under the sawn wood power are placed on the fermentation plate, and the biodegradable spheres are filled with the flora. The septic equipment for raising the rabbits has the advantages that water addition is convenient, and the flora is automatically replenished.

The invention provides a lithium iron phosphate/carbon nanobelt composite material, a preparation method and a lithium ion battery. The preparation method comprises the steps that a carbon source compound, a lithium source compound, an iron source compound, a sodium source compound and a phosphorus source compound are subjected to a hydrothermal synthesis reaction, a precursor is obtained, and the sodium source compound is selected from one or more of sodium chloride, sodium sulfide and sodium fluoride; and calcining the precursor in an inert atmosphere to obtain the lithium iron phosphate/carbon nanobelt composite material. By adopting the preparation method, the conductivity of the lithium iron phosphate can be greatly improved, the ion diffusion path is shortened, the rate capability and the cycle performance of the lithium iron phosphate in the application process are further enhanced, and the application power of the lithium iron phosphate is improved.