14results about How to "Rich mesostructure" patented technology

The invention relates to the technical field of adsorbent materials, and discloses a CoMn2O4 spinel adsorbent and a method for removing trivalent antimony in a water body by using the CoMn2O4 spinel adsorbent. The adsorbent is prepared by adopting a co-precipitation and low-temperature thermally induced crystallization synergetic green process: dissolving cobalt salt and manganese salt according to a stoichiometric ratio, dropwise adding a sodium hydroxide solution for co-precipitation, washing an obtained precursor, and drying at 80-120 DEG C under normal pressure for 12-48 hours to directly obtain the adsorbent. According to the method, the spinel material with low crystallinity, high specific surface area and rich surface hydroxyl is controllably synthesized by regulating and controlling the concentration of the precipitator and the drying condition, and the problems of active site loss and high energy consumption caused by traditional high-temperature calcination are avoided. When the composite material is used for treating wastewater containing trivalent antimony, antimony ions can be efficiently removed through the adsorption effect under the appropriate pH condition, excellent adsorption capacity is shown, the technology is simple, cost is low, safety is good, and an efficient and stable adsorption material and a feasible method are provided for water body antimony pollution treatment.

A high-load cobalt-based single-atom catalyst for oxygen reduction and its preparation method are disclosed, belonging to the field of electrocatalysis technology. This method utilizes the cage structure in ZnCo-ZIF to encapsulate nitrogen-rich metal molecules, followed by high-temperature carbonization under nitrogen conditions to obtain the catalyst. Benefiting from the separating effect of Zn metal nodes in ZIF and the spatial confinement effect of the ZIF cages, as well as the high nitrogen content in the guest molecule, a cobalt-based single-atom catalyst with a loading of 4.0 wt% was prepared. Furthermore, compared to traditional preparation methods, the catalyst prepared using a mixed solvent exhibits a small particle size, resulting in a high specific surface area that fully exposes the active sites. The large specific surface area allows for the full exposure of the high-load metal atom active sites, thus demonstrating excellent performance in the oxygen reduction reaction, with a half-wave potential of 0.88 V and a limiting current density of 6.0 mA·cm⁻¹ in 0.1 M KOH electrolyte. ‑2 .

The application provides a preparation method of a double-metal MOF material functionalized transistor sensor for BPA detection, and the material uses ZIF-8 as a carbon source, and a carbon material (Ce@ZIF8 / C) with rich mesoporous structures and good dispersed metal active sites embedded with Ce and Zn double metals is successfully prepared by using a direct pyrolysis method. The Ce@ZIF8 / C material prepared by the application can be applied to the functionalization of a gate electrode of an SGGT sensor, and an electrochemical sensor for real-time monitoring of an organic pollutant BPA in water can be successfully constructed. The electrochemical sensor constructed by the material synthesized by the application has good detection performance on BPA.

The utility model discloses a high-ammonia-nitrogen wastewater treatment device based on a zeolite and MBR combined process. The high-ammonia-nitrogen wastewater treatment device comprises an adjusting tank, a biochemical reaction tank, an MBR membrane tank, a reflux tank and a water producing tank, the interior of the biochemical reaction tank is divided into an anoxic zone and an aerobic zone by a first partition plate, a submersible stirrer is arranged in the anoxic zone, an aeration device is arranged in the aerobic zone, zeolite particles are filled in the anoxic zone, a grid mesh for intercepting the zeolite particles is arranged at an overflow port of the aerobic zone, and an MBR membrane assembly is arranged in the MBR membrane tank; the regulating tank is connected with the biochemical reaction tank through a lifting pump and a lifting pipeline, the anoxic zone, the aerobic zone, the MBR membrane tank and the reflux tank are in overflow connection in sequence, the reflux tank is connected with the anoxic zone through a reflux pump and an external reflux pipeline, and the MBR membrane assembly is connected with the water producing tank through a water producing pump and a water producing pipe. The device can improve the treatment efficiency and treatment effect of the ammonia-nitrogen wastewater and improve the effluent quality.

The invention provides a carbonized resin decolorizing and refining method for mixed dibasic acid dimethyl ester, and belongs to the technical field of chemical separation and purification. According to the technical scheme, spherical carbonized resin formed by carbonizing styrene-divinyl benzene polymer resin is used as an adsorbent, and a colored crude product DBE is subjected to decoloration treatment through a fixed bed process. The carbonized resin has extremely high selective adsorption capacity and adsorption rate on colored impurities in DBE, the Pt-Co color number of the carbonized resin can be reduced from 50 or above to 10 or below, the decolorization rate exceeds 80%, and meanwhile the yield of the DBE product reaches 99% or above. And the resin saturated by adsorption is easy to regenerate and can be repeatedly used. The method is simple in process, efficient and environment-friendly, overcomes many defects of a traditional activated carbon decoloration method, and is particularly suitable for industrial refining production of DBE.

This invention discloses a Ni-Sn / NC(P) electrocatalyst, its preparation method, and its application, relating to the field of electrochemical CO2 reduction raw material technology. In this invention, zinc nitrate hexahydrate, 2-methylimidazolium, and polyvinylpyrrolidone are separately placed in methanol and stirred. After stirring, they are mixed and stirred again, centrifuged, washed, and vacuum dried. Nickel chloride hexahydrate, tin tetrachloride pentahydrate, ethanol, and the obtained ZIF-8@PVP precursor are mixed, heated and stirred in a water bath, centrifuged, washed, and vacuum dried. The obtained Ni-Sn / ZIF-8(PVP) powder is calcined in an inert atmosphere, and after calcination, cooled to room temperature to obtain the Ni-Sn / NC(P) electrocatalyst. This invention provides a diatomic electrocatalyst with regular morphology, uniform elemental distribution, and excellent electrochemical performance for the efficient electroreduction of carbon dioxide to carbon monoxide. Its preparation method is controllable, uses simple equipment, has high conversion efficiency, and is low in cost.

The invention relates to the technical field of preparation of active carbon materials, in particular to a method for preparing a biomass porous carbon material through a coupling activation method and application of the biomass porous carbon material. The preparation method comprises the following steps: by taking waste biomass such as cassava peel as a raw material, performing fermentation, acid leaching activation, low-temperature carbonization, alkali activation, ultrasonic acid pickling and high-temperature impurity removal to obtain the biomass-derived porous carbon material, and performing electron microscope analysis and pore detection on the biomass-derived porous carbon material prepared by the steps. The biomass derived porous activated carbon material is of a porous layered structure and has abundant micropores and mesopores; according to the present invention, the electrochemical test experiment detection results show that the biomass derived porous carbon material has excellent capacitance performance, and when the current density is 0.5 A / g, the specific capacity value range is 200-400 F / g; the material also has good stability, the biomass derived porous carbon material is assembled into a symmetric supercapacitor, and after 10000 circles of stability tests, the retention rate of the specific capacitance of the symmetric supercapacitor can be maintained to be 90% or above.

The invention belongs to the technical field of preparation of positive electrode materials, and particularly relates to a high-rate sodium vanadium phosphate positive electrode material, a preparation method thereof and a battery. The method comprises the following steps: S1, dissolving ammonium metavanadate and oxalic acid in water to form a solution A; s2, performing ultrasonic dispersion on CNT in absolute ethyl alcohol to obtain a dispersion B; s3, slowly dropwise adding the dispersion B into the solution A until a stable transparent blue solution C is formed; s4, sequentially introducing sodium dihydrogen phosphate and thioacetamide into the solution C, and stirring to form viscous gel; and S5, carrying out vacuum drying on the viscous gel to obtain a precursor, then carrying out high-temperature heat treatment on the precursor under the protection of a nitrogen atmosphere, and finally putting a product subjected to high-temperature heat treatment in a liquid nitrogen atmosphere for rapid cooling to obtain the high-rate sodium vanadium phosphate positive electrode material. The material has relatively low resistance and relatively large sodium ion diffusion coefficient, so that the reversible specific capacity is highest, and the rate capability is best.

The invention discloses a nitrogen-doped porous carbon material which is prepared by taking a nitrogen-containing compound as a nitrogen source and EDTA (Ethylene Diamine Tetraacetic Acid) metal salt as an activating agent and a carbon source through pyrolysis. Through the synergistic effect of the nitrogen source and the EDTA metal salt, carbon skeleton construction, nitrogen atom in-situ doping and pore self-activation are synchronously achieved, the problems that an existing nitrogen-doped porous carbon preparation process is complex, and adsorption performance and selectivity are difficult to consider at the same time are solved, the material can be efficiently used for CO2 capture in industrial flue gas and other scenes, and the application prospect is wide. The method has a wide industrial application prospect.

The invention belongs to the technical field of catalyst preparation, and relates to a simple preparation method and application of a mesoporous hydrogenation catalyst carrier. The preparation method comprises the following steps: adding aluminum nitrate nonahydrate and terephthalic acid into N, N-dimethylformamide, and uniformly mixing to obtain a mixed solution A; heating the mixed solution A in a sealed state, and carrying out hydrothermal reaction; after the reaction is finished, centrifuging and washing to obtain an MIL-53 precursor; and calcining the MIL-53 precursor to obtain the mesoporous carrier. The preparation process of the mesoporous hydrogenation catalyst carrier provided by the invention does not need complex operations such as acid pickling and a template method, and the preparation method is simple in process, economical and efficient. According to the mesoporous carrier prepared by the method, the aperture can reach 20-30nm, mass transfer is more facilitated, and the catalytic activity is improved. The mesoporous hydrogenation catalyst carrier has the advantages of high mesoporous rate and high catalytic activity, can be recycled for multiple times, and provides a new thought for preparation and application of the mesoporous hydrogenation catalyst carrier.

The invention belongs to the technical field of fuel cells, and provides an aperture-adjustable sulfur-nitrogen co-doped mesoporous carbon material for a fuel cell and a preparation method and application thereof.The preparation method comprises the steps that organic magnesium salt, a polyhydroxy compound capable of being fused and gelatinized at the temperature of 200-300 DEG C and a compound containing sulfur and nitrogen element compound-urea are used as raw materials; after dissolving and uniformly mixing, carrying out heating polymerization and microwave-assisted uniform dispersion; gradually converting the mixed solution into a uniform gel precursor along with the volatilization of the solvent; and grinding into powder, carrying out three-section gradient carbonization program heating carbonization treatment under the protection of inert atmosphere, and removing the template through acid pickling to obtain the target product. According to the present invention, the directional adjustment of the mesopore size and the pore size distribution is achieved, and by using the mesoporous structure as the fuel cell cathode catalyst carrier, the mass transfer path can be effectively optimized by using the high specific surface area and the adjustable mesoporous structure, and the oxygen reduction reaction activity, the polarization performance and the long-term stability can be significantly improved.

The invention discloses a super-hydrophobic polymer supported atomic metal adsorbent as well as a preparation method and application thereof. According to the adsorbent, carboxyl-modified super-hydrophobic nano-porous polydivinylbenzene is used as a carrier, and atomic-scale dispersed metal is loaded through coordination to form a metal-carboxyl center. The adsorbent has the advantages of high NH3 adsorption capacity, ultrahigh NH3 / N2 / H2 selectivity, excellent water resistance, excellent SO2 resistance, excellent NOx poisoning resistance and excellent thermal stability. The unique super-hydrophobic surface can effectively repel competitive adsorption of water molecules and corrosive gas, and the atom-scale dispersed metal-carboxyl center realizes reversible and specific recognition and capture of NH3 through coordination and hydrogen bond cooperation. The performance attenuation of the adsorbent is less than 3% after 50 times of adsorption-desorption cycles, and the adsorbent is suitable for gas separation processes in extreme environments such as fuel cell high-purity hydrogen preparation, ammonia recovery in industrial tail gas, pollution control and the like.

The application relates to the technical field of organic polymers, in particular to a preparation method of a novel porous organic polymer and application of the novel porous organic polymer in a water-based zinc ion battery, and comprises the following preparation steps: S1. 3,3-diamino-[1,1-biphenyl]-4,4-diol and p-toluenesulfonic acid are mixed in a mortar, deionized water is added, and mixing is uniformly carried out; S2. 1.57-1.6 parts of 2,4,6-triformylphloroglucinol is added, and grinding is continuously carried out to obtain a white gray powder; S3. the white gray powder is washed after being heated in a closed condition, and the novel porous organic polymer is obtained after drying. The zinc ion battery prepared by the novel porous organic polymer has high specific capacity and cycle retention rate, the battery internal resistance is reduced, the polarization phenomenon is weakened, and the ion conductivity is improved. Meanwhile, the raw materials used in the application have a wide source and low price, the preparation process does not need toxic solvents, conforms to the green chemical concept, and has a good industrialization prospect.

The invention relates to the technical field of biomedical materials, discloses a preparation method of a bone repair mineralized biological membrane capable of inducing gene expression and a product, and aims at solving the problems that an existing bone repair material HAP crystal is difficult to regulate and control, the mechanical activity and the biological activity are not matched, bone induction is weak, the process is complex and the like. The preparation method comprises the following steps: S1, preparing a decellularized small intestinal submucosa (SIS) membrane and sterilizing; s2, constructing a pDA-PAM (at) SIS composite membrane; s3, inducing directional growth of HAP through ion permeation biomimetic mineralization; and S4, cleaning and drying to obtain the HAP / SIS collagen mineralized biological membrane. The product contains an SIS collagen matrix and low-crystallinity nano HAP (the width is 4-20nm, the length is 31-105nm, and the product is oriented along a c axis), the tensile strength is greater than or equal to 13MPa, the elastic modulus is greater than or equal to 75MPa, the specific surface area is greater than or equal to 60m < 2 > / g, and osteogenic genes such as ALP, Runx2 and the like can be up-regulated by more than or equal to 2 times. The method is mild in process, easy to operate, good in biocompatibility, high in bone conduction and inductivity, suitable for large-scale production and capable of meeting the clinical bone defect repair requirement.