16results about How to "Increase surface active sites" patented technology

The invention discloses an attapulgite-fly ash composite adsorbent as well as a preparation method and application thereof, and the preparation method comprises the following steps: crushing, grinding and screening natural attapulgite, mixing with dilute sulphuric acid, carrying out constant-temperature oscillation treatment, washing to remove residual dilute sulphuric acid after reaction, filtering and drying to obtain acidified attapulgite; the preparation method comprises the following steps: adding acidified attapulgite into deionized water, heating and stirring, adding lanthanum chloride heptahydrate and polyaluminum chloride powder, and dropwise adding ammonia water at the same time to realize loading of lanthanum and aluminum on the surface of the acidified attapulgite; after heating and stirring, filtering and drying to obtain modified attapulgite; and mixing the modified attapulgite with fly ash, then carrying out mechanical grinding treatment, putting the ground sample into a tubular furnace, and carrying out anaerobic roasting to obtain the attapulgite-fly ash defluorination adsorbent. The attapulgite-fly ash defluorination adsorbent prepared by the invention has relatively strong selectivity and specific adsorption effect on fluorine ions in wastewater discharged by a chemical plant, and has renewability.

The invention provides a preparation method and application of a fuel cell catalyst, and belongs to the technical field of catalysts. Comprising the following steps: S1, sequentially adding a platinum precursor solution, a first solvent and a second solvent, magnetically stirring until the mixture reaches a clear state, and standing and aging at normal temperature to obtain sol-gel; s2, the obtained sol-gel is placed in a muffle furnace for heat treatment, then the sol-gel is naturally cooled to the room temperature, and calcined powder is taken out, ground, cleaned and dried; s3, taking the powder and a carbon carrier, adding a third solvent and a dispersing aid, carrying out emulsification shearing dispersion under an ice-water bath condition, and then filtering and drying; and S4, placing the cleaned powder in a tubular furnace, introducing a reducing atmosphere, carrying out heating reduction, cooling to room temperature, taking out the powder, cleaning, and drying to obtain the supported hollow-structure Pt catalyst powder. The preparation process is simple and easy to operate, low in equipment cost and maintenance cost, environment-friendly and easy to realize industrial continuous mass production.

The present invention relates to a method for preparing a graphite phase carbon nitride composite nano silicon negative electrode material, and belongs to the technical field of lithium ion batteries. The present invention discloses a method for preparing a graphite phase carbon nitride composite nano silicon negative electrode material, which includes the following steps: A1: carbon nanotubes are placed in a mixed acid for infiltration treatment, and after solid-liquid separation, the solid is washed with deionized water to adjust the pH value to neutral, and then dried to obtain oxidized carbon nanotubes; A2: oxidized carbon nanotubes and modified silicon powder are added to a cyanuric acid solution, stirred and mixed to form a mixed solution, the mixed solution is poured into a melamine solution, stirred and placed to precipitate, and the filtered precipitate is washed with deionized water and dried to form a solid precipitate; A3: the solid precipitate is moved to a tubular furnace, argon gas is introduced, the temperature is increased and kept warm, and then cooled to obtain a graphite phase carbon nitride composite nano silicon negative electrode material. The cycle performance, service life and conductive performance of the silicon negative electrode material are improved by the above method.

The invention belongs to the technical field of concrete, and particularly relates to basalt fiber composite modified sprayed concrete and a preparation method thereof. The basalt fiber composite modified sprayed concrete is prepared from the following raw materials in parts by weight: 420 to 470 parts of cement, 200 to 220 parts of water, 830 to 860 parts of sand, 840 to 880 parts of gravel, 40 to 60 parts of admixture, 15 to 30 parts of modified basalt fiber, 2 to 6 parts of polycarboxylate superplasticizer and 5 to 12 parts of alkali-free accelerator. The modified basalt fiber is added into the sprayed concrete to serve as a reinforcing phase, the strength and impact toughness of the concrete can be improved, and the later strength of the concrete is guaranteed. The cerium trifluoride modified fly ash is added into the admixture, so that the rebound rate can be reduced, and the early strength of the concrete is improved.

This invention belongs to the field of reversible proton ceramic battery technology, and relates to an oxygen electrode material for a three-phase heterointerface reversible proton ceramic battery. The three-phase heterointerface reversible proton ceramic battery oxygen electrode material is a three-phase composite containing A-site defects in double perovskite Pr. 1‑α BaCo2O 5+δ1 (PBC) phase, single perovskite BaPrO 3‑δ2 The invention comprises a (BPO) phase and in-situ desoluble praseodymium oxide nanoparticles; with the total mass percentage of PBC phase, BPO phase, and praseodymium oxide nanoparticles being 100%, the PBC phase accounts for 50-65 wt%, the BPO phase accounts for 33-45 wt%, and the praseodymium oxide nanoparticles account for 1-5 wt%. The three-phase heterogeneous interface oxygen electrode material constructed in situ in this invention exhibits tight coupling and synergistic effects among the three phases, resulting in both a low coefficient of thermal expansion and high catalytic activity. This oxygen electrode material demonstrates excellent electrochemical performance in reversible proton ceramic batteries, whether in fuel cell mode or electrolyzer mode.

The invention discloses an active magnesium oxide and a preparation method thereof, and relates to the technical field of magnesium oxide preparation. The method comprises the following steps: calcining and dissociating the first magnesium ore, strengthening leaching and carbonization separation to obtain calcium carbonate and active low-calcium magnesium-rich liquid; calcining and dissociating the second magnesium ore and mechanically grinding to obtain fine material, or directly mechanically grinding the second magnesium ore to obtain fine material; pumping the active low-calcium magnesium-rich liquid into a hydration activation tank, stirring and then conveying the fine material to the hydration activation tank, the active low-calcium magnesium-rich liquid and the fine material undergo hydration reaction and form a composite magnesium salt; drying and breaking up the composite magnesium salt and conveying it to a calcining furnace, calcining, cooling and spiral discharging to obtain active magnesium oxide. The magnesium oxide prepared by the method has moderate density, rich active sites, good dispersibility, excellent adsorption, hydration and ionization properties, and has significant effects and cost advantages as an alkaline precipitant, which is conducive to the market promotion and application of high-activity magnesium oxide products in the fields of environmental protection and metallurgy.

The invention provides a dual-signal molecularly imprinted electrochemical sensor based on Cu / Fe-MOF (Metal Organic Framework) and AuNPs (AuNPs) and a preparation method of the dual-signal molecularly imprinted electrochemical sensor. Carbon cloth is used as a substrate, Cu / Fe-MOF grows in situ, an AuNPs modified electrode is electrically deposited, and a double-signal system is constructed; and preparing the molecularly imprinted polymer film layer by using semicarbazide as a template through electro-polymerization. According to the sensor, high-sensitivity detection of semicarbazide is achieved through double-signal change, the linear range is 0.005-100 nM, and the detection limit is 0.0039 nM. According to the invention, a large specific surface area material and a molecular imprinting technology are combined, so that the detection sensitivity and specificity are improved; the dual-signal mode enhances the detection stability and accuracy; the preparation method is simple, low in cost, suitable for quantitative analysis of trace substances and wide in application prospect.

This invention discloses a hierarchical guanidine resin-based CO2 adsorbent material and its preparation method, belonging to the field of polymer synthesis technology. The adsorbent material prepared by this invention has a composite spherical structure and a hierarchical pore structure, including micropores, mesopores, and macropores. By introducing a hierarchical pore structure, the adsorption capacity of the material for CO2 is effectively improved. The introduction of hierarchical pores can significantly reduce molecular diffusion resistance and increase the contact area between the adsorbent and CO2 molecules, thereby achieving rapid adsorption. Furthermore, pyridyl, polyamino compounds, and guanidine groups have strong basicity and chemical affinity for CO2. Through surface functionalization modification, the number of active sites on the material surface is significantly increased, thereby further improving the CO2 adsorption capacity and selectivity.

The invention relates to the technical field of catalyst preparation, in particular to a preparation method of an In2O3-based finger-shaped photocatalyst, which comprises the following steps: step 1, adding a certain amount of indium source and terephthalic acid into a reactor, then adding N, N-dimethylformamide (DMF), and stirring to completely dissolve the solid to obtain a solution A; 2, the solution A obtained in the step 1 is placed in an oil bath pan for oil bath heating, after the reaction is finished, cooling, filtering, washing and drying are conducted, and solid powder can be obtained; compared with the prior art, the preparation method has the advantages that a solvothermal synthesis technology is utilized, the microstructure of In2O3 is finely regulated and controlled, a unique finger appearance is formed, then iridium monatomic is accurately supported through a wet chemical method, and the density and electron transfer efficiency of photocatalytic active sites are remarkably improved. The obtained catalyst shows excellent gamma-lactam photocatalytic conversion capability under visible light irradiation, and the conversion rate is up to 95% or above.

The invention discloses a magnesium-based cobalt precipitation agent and a preparation method and application thereof, and relates to the technical field of composite materials. The method comprises: subjecting a first magnesium ore to calcination dissociation, enhanced leaching, carbonization separation, efficient pyrolysis, solid-liquid separation, and dry calcination to obtain active magnesium oxide; subjecting a second magnesium ore to calcination dissociation, hydration and impurity removal, solid-liquid separation, and low-temperature calcination to obtain high-purity magnesium oxide; mixing and modifying active magnesium oxide and high-purity magnesium oxide to obtain a magnesium-based cobalt precipitation agent; the mass ratio of active magnesium oxide to high-purity magnesium oxide is 1:2-10, the modifier is a quaternary ammonium salt organic powder, and the amount of the modifier added is 0.02-1% of the total mass of magnesium oxide. The magnesium-based cobalt precipitation agent prepared by the method has high activity, and has the advantages of high efficiency, low price, low unit consumption, and environmental friendliness in the wet smelting of nickel and cobalt in copper-cobalt ore and laterite nickel ore, and can greatly reduce the material cost in the production process of nickel and cobalt hydroxide.

The invention relates to the field of cement, and particularly discloses environment-friendly cement based on carbonaceous coal gangue and a manufacturing method of the environment-friendly cement. The environment-friendly cement based on carbonaceous coal gangue comprises the following raw materials: 60-80 parts of modified coal gangue powder; 30 to 40 parts of cement clinker; 10 to 20 parts of slag powder; 10 to 15 parts of desulfurized gypsum; 5-10 parts of tourmaline powder; 5-10 parts of ammonium sulfate micro powder; 3 to 7 parts of sodium carboxymethyl cellulose; the modified coal gangue powder is obtained by calcining and activating coal gangue powder and enhancing the coal gangue powder with a beta-alanine aqueous solution. According to the environment-friendly cement, the coal gangue is used as one of the main raw materials, and the coal gangue is converted into the environment-friendly cement with high additional value through activation and enhancement treatment. Not only is the dependence on natural resources reduced, but also the recycling of waste resources is realized, and the resource utilization rate is increased; moreover, the cement disclosed by the invention can keep relatively good working performance in a construction process.

The present invention belongs to the technical field of organic synthesis, and specifically relates to a method for preparing 5-acetoacetylaminobenzimidazolone. The present invention utilizes chitosan grafted around the 5-aminobenzimidazolone structure to prevent it from being oxidized, and simultaneously promotes the acylation reaction of 5-aminobenzimidazolone by phosphating chitosan, and uses boron trifluoride as a catalyst for the acylation reaction to further improve the conversion rate of 5-aminobenzimidazolone, and finally achieves a 5-acetoacetylaminobenzimidazolone yield of more than 92%, effectively improving production efficiency.

The application relates to the field of cement, and particularly discloses an environment-friendly cement based on carbonaceous coal gangue and a manufacturing method thereof. The environment-friendly cement based on carbonaceous coal gangue raw materials comprise modified coal gangue powder 60-80 parts; cement clinker 30-40 parts; slag powder 10-20 parts; desulfurization gypsum 10-15 parts; tourmaline powder 5-10 parts; ammonium sulfate micro powder 5-10 parts; sodium carboxymethyl cellulose 3-7 parts; and the modified coal gangue powder is obtained by calcining and activating coal gangue powder and then treating the coal gangue powder with a beta-alanine aqueous solution. The environment-friendly cement disclosed by the application takes coal gangue as one of main raw materials, converts the coal gangue into environment-friendly cement with high added value through activation and enhancement treatment. This not only reduces the dependence on natural resources, but also realizes the recycling of waste resources and improves the resource utilization rate; and the cement disclosed by the application can maintain good working performance in the construction process.

The invention discloses a method for treating zinc-containing fly ash from a steel plant by a chlorination smelting process, and belongs to the technical field of zinc-containing fly ash treatment. The method first pre-treats the zinc-containing fly ash, refines the particle size of the zinc-containing fly ash, increases the specific surface area of ​​the zinc-containing fly ash, and facilitates the reaction between zinc, lead and a chlorinating agent; secondly, the chlorinating agent used in the present invention includes a chlorinated hydrocarbon compound, and the chlorinating agent is loaded on a porous silicon carbide carrier, and the chlorinated hydrocarbon compound is gradually released during the chlorination treatment process, and can fully react with zinc and lead contained in the zinc-containing fly ash. The porous silicon carbide as a carrier can improve the overall strength and stability of the chlorinating agent, has good thermal conductivity, can effectively transfer reaction heat, improve the reaction selectivity of the chlorination treatment, and significantly improve the zinc removal rate of the zinc-containing fly ash treated by the chlorination method. And by loading on the porous silicon carbide carrier, the corrosion problem of the chlorinating agent on the equipment can be effectively avoided, and the application of the chlorination method in industry can be promoted.

The invention discloses a nitrogen-doped graphite phase carbon nitride nanosheet loaded optical fiber composite photocatalytic material as well as a preparation method and application thereof. The nitrogen-doped graphite phase carbon nitride nanosheet is composed of C and N elements, and the constituent elements are uniformly dispersed on the surface of the ultrathin mesoporous nitrogen-doped graphite phase carbon nitride nanosheet, so that the nanosheet has a higher specific surface area and more surface active sites. The prepared nitrogen-doped graphite-phase carbon nitride nanosheet is loaded on the light-guide fiber, so that harmful substances in wastewater can be degraded in a short time, the nanosheet can be repeatedly used for more than three times, and the nanosheet is simple to use, green and environment-friendly. The preparation method of the nitrogen-doped graphite-phase carbon nitride nanosheet or the method of loading the nitrogen-doped graphite-phase carbon nitride nanosheet on the light-guide fiber is simple to operate and wide in raw material source, and has certain practicability.

The invention discloses a method for preparing pyrolytic carbon black through two-step pyrolysis of waste tires in a vertical microwave pyrolysis reactor, and belongs to the field of waste tire resource utilization. Carbon black and inorganic metal oxide in waste tire rubber powder are used as wave-absorbing media, uniform volume heating is initiated through microwave molecule dipole rotation, and the uniformity of particle size distribution of the carbon black is improved. The ratio of the microwave power to the mass of the rubber powder is adopted as a new criterion of the microwave radiation intensity, and it is ensured that the microwave radiation intensity borne by each gram of the rubber powder is larger than 100 W. The waste tires are subjected to low-power one-time pyrolysis decomposition, and a stable three-phase product is obtained; hydrocarbon residues on the surface of the carbon black are removed through high-power secondary pyrolysis, and the amorphous structure of the carbon black is stabilized by shortening the high-temperature retention time. The pyrolytic carbon black prepared by the method is more uniform in particle size distribution, lower in graphitization degree and enhanced in chemical activity, and the reinforcing performance of the pyrolytic carbon black on rubber is obviously superior to that of the pyrolytic carbon black prepared by a conventional method.