37results about How to "High degree of carbonation" patented technology

A preparation method for nitrogen-doped mesoporous carbon nanofiber relates to the technical field of electrode materials of supercapacitors. According to the preparation method, gelatin is taken as a carbon source, urea is taken as a nitrogen source and a template, under evaporation driving of a solvent water, urea is crystalized, gelatin molecules are self-assembled on the surface of urea crystal, gelatin is subjected to condensation and carbonization at a high temperature, urea molecules are decomposed and nitrogen atoms are doped into the carbon material, and finally nitrogen-doped mesoporous carbon nanofiber is prepared. The advantages comprise that the prepared electrode material possesses relatively high nitrogen content, large specific surface area and high graphitization degree, also possesses relatively good electrochemical performances, and also possesses important application value in fields of capacitor electrode materials and the like.

The invention discloses a carbon dioxide cured prefabricated water-permeable concrete and a preparation method thereof. The water-permeable concrete is composed of following components in parts by weight: 55 to 80 parts of regenerated aggregate, 7 to 30 parts of nickel slag sand, 18 to 40 parts of cementing material, 5 to 25 parts of water, 0.01 to 2 parts of naphthalene water reducer, 0 to 0.02 part of cellulose ether, and 0 to 0.01 part of welan gum. The cementing material is composed of following components in parts by weight: 70 to 90 parts of common silicate cement, 5 to 15 parts of fly ash, 10 to 30 parts of steel slag, 5 to 15 parts of lime or lime slag, and 0.02 to 1 part of nano calcium carbonate. The technology is simple, the structure advantage of water-permeable concrete and the properties of industrial byproducts such as nickel slag, steel slag, fly ash, and the like are fully utilized; carbon dioxide curing is utilized to realize rapid, efficient and environmentally friendly production; high strength, durable and water permeable concrete is obtained, the energy consumption is reduced, the industrial tail gas, metallurgy slag, and building waste are effectively utilized, and good economic benefits, social benefits, and environmental benefits are generated.

The invention belongs to the technical field of materials, and discloses a method for preparing a multistage porous carbon material. The method includes the steps of dissolving tin salt, carbohydrate compound and organic sulfur compound to obtain a clear mixed solution, conducting hydrothermally reaction to obtain SnS/C composite material precipitate, calcinating at a high temperature after washing and drying to obtain a sulfur-doped multistage porous carbon material. The porous carbon structure improves the sufficient wettability between the material and an electrolyte and ensures excellent charge conduction. Trace sulfur elements play a role in improving the charge-adsorption capacity in the porous carbon structure, and the synergetic effect of the two effectively improves the specific capacitance of the material, multiplying power performance and cycling performance.

The invention discloses an in-situ carbonization method for improving the structural properties of a carbonized product. Before the carbonized product is formed, when raw materials are mixed, alkali-resistant bacteria capable of performing the urea hydrolysis reaction are added and uniformly distributed in the raw materials; when the product is formed, a urea nutrient solution replaces a water-mixed water to form the product; after forming, demolding and carbonization maintenance, the product is immersed in the urea nutrient solution for continuous maintenance. According to the method, the bacterial powder is added in the carbonized product, the bacteria are in contact with the urea nutrient solution in the later maintenance process, and therefore the urea hydrolysis reaction is conducted;urea is decomposed into carbon dioxide and water through the metabolism of the bacteria, carbonate ions are generated from the inside, and therefore the carbonization process from inside to outside is achieved. By means of the method, the carbonization degree of the carbonized product can be increased, and the compactness and the strength are improved accordingly; compared with methods for greatly increasing the pressure of carbon dioxide and the like, the cost is low, and the process is simple.

The invention discloses a preparation method of a ferriferrous oxide@nitrogen doped carbon compound. The preparation method comprises the following steps: 1, mixing analytically pure aniline with 0.01mol/L of an inorganic acid to prepare an aniline-inorganic solution; 2, using ferriferrous oxide and distilled water to prepare a ferriferrous oxide solution with the mass concentration of 5-20mg/mL; 3, adding the aniline-inorganic solution into the ferriferrous oxide solution; 4, adding hydrogen peroxide with the mass percentage of 30% into the solution obtained in step 3 in a dropwise manner, reacting for 5-24h, carrying out magnetic separation, washing the obtained precipitate with water, and drying to prepare ferriferrous oxide@polyaniline nanoparticles; and 5, carrying out high temperature carbonization on the ferriferrous oxide@polyaniline nanoparticles obtained in step 4, and annealing in N2 atmosphere for 3-5h to prepare the ferriferrous oxide@nitrogen doped carbon compound. The ferriferrous oxide@nitrogen doped carbon compound prepared in the invention has the advantages of strong binding force, high carbonization degree, controllable thickness, and improvement of the conductivity of nitrogen doped carbon.

The invention discloses a method for preparing modified biochar from plant waste and application of the modified biochar. The method comprises the following steps: fully mixing and infiltrating plant dry powder, a magnesium salt and water, performing drying, fully grinding the mixture, and carrying out pyrolytic reaction in a nitrogen atmosphere to obtain the modified biochar. Compared with other carbon-based adsorbents of the same type, the modified biochar prepared through the method has good adsorption performance on phosphate; the technology provided by the invention has the characteristics of low energy consumption, simple operation and short treatment period in plant waste treatment and resource utilization, and can fully realize the goals of reduction, harmlessness and resource utilization of biomass solid wastes.

The invention relates to a method for improving the strength of a calcium hydroxide carbonized hardened body and a product. The method for improving the strength of the calcium hydroxide carbonized hardened body comprises the following steps: uniformly mixing a calcium hydroxide raw material, ordinary Portland cement, magnesium hydroxide, pottery sand and water according to a mass ratio of 100: (15-20): (15-20): (40-80): (10-20), and carrying out compression molding, carbonization curing and natural curing to obtain the product. Through the synergistic effect of physical adsorption and chemical reaction, moisture generated by carbonization of calcium hydroxide is consumed, and meanwhile, the carbonization degree and the gelling property of a reaction product are further improved through the C-S-H gelling effect generated by hydration of cement, the cementing effect of a carbonized product of magnesium hydroxide and the gas transmission channel and internal curing effect of pottery sand; therefore, the strength of calcium hydroxide carbonized and hardened body is greatly improved.

The invention relates to a preparation method of viscose high-temperature graphite carbon fibers. The method comprises the following steps: (1) dipping into chemicals: dipping the viscose fibers intoa dilute solution of diammonium hydrogen phosphate or ammonium bromide for not less than 24h at room temperature, wherein the viscose fibers are cloth made of tows; (2) drying: introducing the viscosefibers, dipped into the chemicals, into a drying oven at 180 DEG C or enabling the viscose fibers to be naturally dried, and controlling the humidity not to exceed 10%; (3) carrying out step-by-stepcarbonization: enabling the dried viscose fibers to be sequentially subjected to the low-temperature precuring, medium-temperature carbonization and high-temperature carbonization to obtain the viscose high-temperature graphite carbon fibers. The preparation method provided by the invention can not only carbonize the viscose fiber tows, but also carbonize the cloth made of viscose fiber tows, thusincreasing the application targets of carbonization, and further promoting a carbonization process of the viscose fibers; furthermore, the carbon content of the obtained viscose high-temperature graphite carbon fibers is as high as 99.99%, and the degree of carbonization is high, so that the acting force between carbon atoms in the carbon fibers is further improved, and the performance of the carbon fibers is better maximized.

The invention discloses a method for preparing carbon-copper-coated ferroferric oxide composite magnetic oil removal particles. The method comprises the following steps of modifying ferroferric oxide,introducing a carbon source, adding a lubricant, an emulsifying and thickening agent and a stabilizer, and then carrying out heat treatment so as to prepare the Fe3O4@C/Cu composite magnetic oil removal particles. The method has the advantages that the technical problems that a floating oil cleaning technology is tedious in preparation process, incapable of realizing mass production and the likecan be solved; and the particles prepared through the method is high in surface carbonization degree and stable in carbon layer, mass production can be realized, and the good particle preparation method solves the problem of floating oil on the water surface.

The invention discloses a 3D printing magnesium oxychloride cement concrete product and a maintenance method thereof. The magnesium oxychloride cement concrete product comprises the following raw materials in parts by weight: 100 parts of light calcined magnesia, 100-150 parts of magnesium-based standard sand, 0-70 parts of water granulated slag sand, 130-200 parts of magnesium chloride hexahydrate, 0-40 parts of engineering residue soil, 0.5-10 parts of an additive, 10-30 parts of dry ice and 30-60 parts of water. According to the method, the dry ice is added into the magnesium oxychloride cement mortar additive newly-mixed slurry, the temperature of the newly-mixed slurry before final setting of magnesium oxychloride cement is reduced at low cost, carbon dioxide gas is conveniently introduced into the magnesium oxychloride cement newly-mixed slurry, magnesium hydroxide generated by reaction is fully carbonized, and the carbonization degree of the magnesium oxychloride cement newly-mixed slurry is remarkably improved; and the water granulated slag sand and the engineering residue soil generated by steelmaking are directly added into a magnesium oxychloride cement concrete product, resource utilization is achieved, the magnesium oxychloride cement mortar additive is used for 3D printing, and engineering application of magnesium oxychloride cement is promoted.

The invention discloses a preparation method and application of a composite material, the preparation raw materials comprise nickel mercaptide, cube sugar and polystyrene, and the nickel mercaptide is used as a catalyst to improve the crystallinity of the sugar/polystyrene composite material in the hydrogenation process so as to improve the conductivity and electrochemical performance of the material; the porous cube sugar is used as a carbon source while being used as a soft template for bearing polystyrene and a catalyst, so that the carbonization degree of the material is improved, and the need of additional high-pressure carbon source supplementation in a high-temperature graphitization process is avoided; the preparation method of the composite material provided by the invention is green and environment-friendly, waste polystyrene can be effectively utilized and converted into a graphite carbon electrode with high capacity and long cycle stability under high magnification to be used as energy storage equipment, and the problem of large-scale white pollution at present is solved.

The invention discloses a calcium silicate board and a preparation method thereof, belonging to the technical field of inorganic boards. The preparation method of the calcium silicate board comprises the following steps: mixing iron oxide green, a dispersing agent and water to obtain a mixed solution; mixing a white material, tailings and stone powder to obtain a mixture; mixing the mixed solution and the mixture to obtain a wet material; pressing the wet material into a green body, drying the green body at 30-60 DEG C until a water loss rate reaches 50-70%, and then taking out the green body to obtain a calcium silicate substrate; and carbonizing the calcium silicate substrate in a vacuum CO2 environment to obtain the calcium silicate board. The calcium silicate board is high in breaking strength, low in water absorption rate and high in carbonization degree.

The invention discloses a magnesium oxychloride cement additive for 3D printing and an application thereof. The magnesium oxychloride cement is prepared from the following raw materials in parts by weight: 100 parts of light calcined magnesia, 122.4-150.0 parts of magnesium chloride hexahydrate, 0-6.5 parts of an additive, 0-20 parts of dry ice and 40-73 parts of water, according to the method, dry ice is added into the magnesium oxychloride cement fresh mixed paste, so that the technical problem of cooling of the magnesium oxychloride cement fresh mixed paste is solved, carbon dioxide generated by the dry ice promotes an exothermic reaction of the magnesium oxychloride cement, the carbonization degree of a hydration product is improved, and the early microstructure and macroscopic performance of the magnesium oxychloride cement additive are effectively improved; the temperature of the curing environment is kept consistent with that of the magnesium oxychloride cement additive through a temperature control carbonization chamber, so that microdefects and microcracks caused by temperature stress in the hydration process of the magnesium oxychloride cement additive are effectively reduced; the magnesium oxychloride cement additive is used for 3D printing, the industrialization level of the magnesium oxychloride cement is improved, and engineering application of the magnesium oxychloride cement is promoted.

The invention relates to a carbon dot with high thermal stability and a preparation method thereof, which comprises the following steps: by taking 2,7-dihydroxynaphthalene and citric acid as carbon sources and water as a solvent, preparing yellow fluorescent carbon dots by adopting a hydrothermal method, heating to 200-400 DEG C in the inert environment, and performing annealing treatment, therebyobtaining the green fluorescent carbon dots. The carbon dot prepared by the invention emits green fluorescence under the excitation of ultraviolet exciting light, has high thermal stability, can bearthe high temperature of 250 DEG C, and can be used as light conversion fluorescent powder to be applied to the preparation of a laser diode light-emitting device.