25results about How to "Rich mesostructure" patented technology

The invention provides a metal organic framework material with a hollow structure and a preparation method thereof, a solid-phase micro-extraction agent containing the metal organic framework material, and a preparation method and application of the solid-phase micro-extraction agent. The metal organic framework material is formed by synthesizing ZIF-8 from 2-methylimidazole and Zn (NO3) 2.6 H2O, and then performing ligand conversion and etching on the ZIF-8 through 2, 5-dihydroxy terephthalic acid. The metal organic framework material is of a hollow shell structure, the shell structure comprises a hollow shell layer and a plurality of rod-shaped structures located outside the hollow shell layer, the metal organic framework material keeps the main form of a ZIF-8 dodecahedron, the protruding rod-shaped structures continuously extend outwards, and richer reaction sites and larger specific surface area are provided. The invention further provides a solid-phase microextractant containing the metal organic framework material and application of the solid-phase microextractant, and the method has the outstanding advantages of being high in sensitivity, easy to operate, environmentally friendly and the like, has high removal efficiency and large adsorption capacity on nitrogen-containing pesticides (ONPs) and can be applied to rapid detection of environmental samples.

The invention discloses a metal organic framework material composite membrane as well as a preparation method and application thereof. The metal organic framework material composite membrane provided by the invention comprises a substrate, a hydrophilic layer, an adsorption layer and a fixing layer which are sequentially stacked, the fixing layer covers the surface of the adsorption layer and is connected with the hydrophilic layer; the adsorption layer contains a carbonized metal organic framework material, and the fixing layer contains a hydrophilic polymer. The carbonized metal organic framework material is used as the adsorption layer, and the material has a rich mesoporous structure and a high specific surface area, so that the adsorption activity of the composite membrane is improved; the hydrophilic layer is matched with the fixing layer, so that the adsorption layer can be simply, efficiently and firmly fixed in the membrane material, the composite membrane with good adsorption performance, high mechanical performance and good stability is formed, and the composite membrane has a good application prospect in gas adsorption and enrichment, especially in krypton and / or xenon adsorption and enrichment.

The invention belongs to the technical field of water treatment water purifying agents, and particularly relates to a method for preparing a polyaluminum chloride water purifying agent from aluminum mud. The preparation method comprises the following steps: carrying out ball milling, washing and acidolysis on aluminum mud to prepare an aluminum-containing solution, adding calcium aluminate to adjust the aluminum content of the solution, curing to prepare polyaluminum chloride, adding cationic polyacrylamide and 2-ethylhexyl acrylate, and polymerizing to prepare the polyaluminum chloride flocculant, so that macromolecular clusters are more easily formed, and the water purification flocculation effect is improved; the modified carbon adsorption material prepared by loading magnesium-aluminum hydrotalcite on bamboo fibers and carrying out low-temperature calcination and carbonization has excellent adsorption capacity; the oil adsorption aid prepared by modifying cotton fibers with catechol and then attaching a silica sol hydrophobic coating has excellent selective oil adsorption capacity; the polyaluminum chloride water purifying agent obtained by compounding the polyaluminum chloride flocculating agent with aluminum sulfate, a modified carbon adsorption material and an oil adsorption auxiliary agent according to a certain proportion has excellent adsorption sedimentation and temperature difference adaptability, and aluminum resources can be recycled.

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 application provides a porous carbon nitride photocatalyst and a preparation method and application thereof, and the porous carbon nitride photocatalyst is prepared by the following steps: uniformly mixing and grinding a nitrogen-rich organic material precursor and a gaseous template agent ammonium chloride; performing high-temperature treatment on the mixed precursor by using a microwave-assisted thermal polymerization method, and cooling to room temperature after the reaction is completed; and grinding, washing and drying the obtained product to collect the GCN. The method uses a one-step microwave-assisted thermal polymerization method to make melamine and the mixed precursor of ammonium chloride react, and the rapid thermal shock effect of the microwave field is used to induce the material to form a porous structure; the ammonium chloride is decomposed at high temperature to generate a bubble effect, which effectively inhibits the excessive stacking of carbon-nitrogen planes, induces the formation of a hierarchical porous structure and introduces rich edge defects. The degradation rate constant of the catalyst for cephalosporin antibiotics can reach 4.16 times that of pure g-C3N4, the catalyst has extremely excellent specific removal capacity for tetracycline, has good chemical stability and broad applicability, and can efficiently realize the deep purification of pollutants in water.

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.

The invention relates to a metal palladium and sulfur loaded carbon-based catalyst and a preparation method and application thereof, the catalyst contains a porous carbon material, sulfur and palladium, the content of the sulfur is 0.2-5.0 wt%, and the content of the palladium is 0.2-5.0 wt% based on the total weight of the catalyst; the palladium is loaded on the porous carbon material in the form of monatomic palladium and / or cluster palladium. The catalyst disclosed by the invention is used for preparing hydrogen peroxide through an electro-catalytic oxygen reduction reaction, has excellent catalytic activity and is relatively high in hydrogen peroxide selectivity.

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 discloses modified phosphate tailing ceramsite for advanced treatment of phosphorus-containing wastewater and a preparation method and application thereof, and relates to the technical field of comprehensive utilization of phosphate tailing resources, the preparation method comprises the following steps: (1) mixing and grinding reverse flotation phosphate tailings, direct flotation phosphate tailings and montmorillonite to obtain a mixture; (2) granulating the mixture to obtain raw material nodules, and drying to obtain dried raw material nodules; (3) roasting the dried raw material balls in a muffle furnace to obtain primary tailing ceramsite; (4) putting the primary tailing ceramsite into deionized water, and dropwise adding a rare earth modified solution with the pH value of 4-5 under the condition of stirring in a water bath at the constant temperature of 30-60 DEG C; after dropwise adding, continuously stirring for 2-6 hours in a constant-temperature water bath, standing and aging for 8-10 hours in the constant-temperature water bath, taking out and drying to obtain the modified phosphate tailing ceramsite for deeply treating the phosphorus-containing wastewater. The efficient phosphorus removal ceramsite has the advantages of low cost, short production period, good phosphorus removal effect and the like, and the obtained efficient phosphorus removal ceramsite has an extremely strong adsorption effect on phosphate.

The invention discloses a method for treating pulp waste water by using a corallite-like MOG-Fe / Al flocculating agent. The method comprises the following steps: preparing the MOG-Fe / Al flocculating agent by using aluminum nitrate, ferric nitrate and trimesic acid; the method comprises the following steps: diluting the cypress wastewater, adjusting the pH and temperature, adding a flocculating agent, and standing for settling. The MOG-Fe / Al flocculant is dense net-shaped colloidal particles which are provided with more holes and are similar to corallite in shape, has interwoven fibers or particles, is rich in mesoporous structure, can provide numerous active centers and is beneficial to diffusion of molecules in the holes, and meanwhile, the specific surface area of the material is large, so that the adsorption performance of the flocculant in water treatment is further improved; the removal rate is improved. Results show that when the addition amount of MOG-Fe / Al is 1.0 g, the concentration of the wastewater is diluted to 100 times, the pH is 9, the flocculation temperature is 30 DEG C, the flocculation time is 12 hours, and the turbidity removal rate of the wastewater can reach 98.3%.

The present invention provides a ZSM-23 zeolite and a preparation process thereof. The pore volume of mesopores having a pore size of 3-8 nm of the zeolite is 45-90% of the total pore volume of the zeolite. The zeolite has a relative crystallinity of 95-120%, and the zeolite has a relative crystallinity retention of 95-100% after a hydrothermal treatment with steam for 2 hours at 600°C. The process for preparing the zeolite comprises the following steps: (1) preparing or selecting a silicon source for preparing the ZSM-23 zeolite, such as amorphous silica; (2) performing an alkali treatment on the silicon source for preparing the ZSM-23 zeolite such as amorphous silica mentioned in step (1); and (3) preparing the ZSM-23 zeolite by using the alkali-treated amorphous silica as the silicon source. The ZSM-23 zeolite has a rich mesoporous structure and good hydrothermal stability.

According to the preparation method, ZIF-67 is taken as a template, nickel nitrate and copper porphyrin are added at the same time, and the metalloporphyrin intercalated double-metal hydroxide material is successfully prepared through acid etching. The material is composed of copper porphyrin Cu-TCPP and hollow NiCo-LDH, and has a hollow porous structure and a large specific surface area. Benefited from the synergistic effect of Cu-TCPP and NiCo-LDH, only 204mv overpotential is needed when the material reaches the current density of 10mA. Cm <-2 >, the material is superior to transition metal-based OER electrocatalysts reported in most literatures, the performance is almost unchanged after a stable test for 12 hours, and the material has a relatively good application prospect.

The invention relates to a casting method for refining an alloy phase in a hypereutectic aluminum alloy, and relates to the technical field of cast aluminum alloys, and the casting method comprises the following steps: preparing the hypereutectic aluminum alloy which comprises the following components in percentage by mass: 18.5-19% of silicon, 4.6-5.2% of copper, 0.35-0.45% of magnesium, 4.24-4.28% of nickel, 0.01-0.05% of phosphorus and the balance of aluminum and inevitable impurities; smelting is conducted according to the nominal components, and molten aluminum alloy liquid is obtained; a grain refiner is added into the molten aluminum alloy liquid, heating and stirring are conducted, ultrasonic treatment is conducted, and the treated aluminum alloy liquid is obtained; a refining agent and a refining solution are added into the treated aluminum alloy liquid, cooling is carried out, stirring and ultrasonic treatment are carried out while adding is carried out, argon is introduced to remove impurities, and the refined aluminum alloy liquid is obtained; and scooping out oxide skin on the surface of the refined alloy liquid, and pouring to obtain the hypereutectic aluminum alloy. The hypereutectic aluminum alloy has the effect of refining the alloy phase in the hypereutectic aluminum alloy, and the mechanical property and the thermal property of the hypereutectic aluminum alloy can be effectively improved.

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 field of soot catalytic combustion, and provides a catalyst for soot removal as well as a preparation method and application thereof. A carbon source, a template agent and a nitrogen source are used as raw materials, and the nitrogen-doped carbon network material with an ultrathin nanosheet interwoven three-dimensional network structure is obtained through a freeze-drying method; and by taking the obtained nitrogen-doped carbon network material as a template, loading a variable-valence metal on the template by a template impregnation method to obtain the metal oxide. The catalyst prepared by the invention not only has a stable ultrathin nanosheet structure, but also has abundant mesopores and uniformly distributed metal nanoparticles. The obtained metal oxide catalyst is used for catalyzing soot combustion, the catalytic activity on soot particles is high, and the selectivity on CO2 is high. According to the preparation method, raw materials are green and cheap, the technological process is simple and efficient, universality is achieved, the method is suitable for most of metal oxides, and wide application prospects are shown in large-scale industrial production.

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.