48results about How to "Maintain specific surface area" patented technology

The invention provides a preparation method and an application of a nitrogen-doped graphene-carbon nanohorn composite material, and belongs to the field of functional carbon materials. The preparation method of the nitrogen-doped graphene-carbon nanohorn composite material comprises the steps of ultrasonically dispersing graphene oxide to form a uniform solution in the presence of a biomass raw material, adding a nitrogen source substance and a carbon nanohorn, performing ultrasonic and uniform dispersion again to obtain a graphene oxide-biomass-nitrogen source substance-carbon nanohorn mixture solution, and drying the mixture to a constant weight, thereby obtaining a nitrogen precursor mixture; and performing normal-pressure high-temperature pyrolysis on the nitrogen precursor mixture to obtain the nitrogen-doped graphene-carbon nanohorn composite material. The prepared nitrogen-doped graphene-carbon nanohorn composite material can be used for electrode materials of lithium ion batteries and supercapacitors. The preparation method is simple; and the obtained composite material is loose in structure and good in nitrogen-doped graphene nanosheet dispersity. The method provides a new way for preparing a nitrogen-doped graphene based composite material.

The invention provides a preparation method of a carbon-nitrogen doped ternary composite metal oxide based on a prussian blue frame material. The preparation method comprises the steps of preparing the prussian blue frame material and calcining the obtained prussian blue frame material, so as to obtain the carbon-nitrogen doped ternary composite oxide. Additionally, the invention also provides application of the prepared carbon-nitrogen doped ternary composite metal oxide serving as a negative material of a lithium ion battery. With adoption of the prepared carbon-nitrogen doped ternary porous composite metal oxide, the change of volume of the negative material in a charging / discharging process can be effectively relieved, and the electronic conductivity of the material is improved, therefore, the reversible specific capacity and the cycling stability of the material can be effectively improved; the main starting material such as the prussian blue complex can be prepared by green methods such as a microwave reaction of water or an ethanol medium, so that the preparation process is simple, and the yield is high; meanwhile, the material contains three different metals, so that the properties of the composite material can be synergetic and complementary through careful selection.

The invention provides a method for modifying a covalent organic framework material. The method comprises the following steps: (1) mixing 1,3,5-tris-(4-aminophenyl)benzene with 2,5-dioxymethyl-terephthalaldehyde, adding o-dichlorobenzene / n-butanol and an acetic acid catalyst, carrying out freezing-exhausting-unfreezing circulation for several times, carrying out flame sealing, heating, centrifugally collecting precipitates, washing, carrying out Soxhlet extraction, drying, and collecting powder, so as to obtain TPB-DMTA-COF; (2) adding 2-methyl-2-butene, a sodium chlorite water solution and glacial acetic acid into dioxane suspension liquid of the TPB-DMTA-COF powder, and stirring in a dark environment, so as to obtain purple solids; and (3) re-oxidizing the purple solids by virtue of thesodium chlorite water solution, and carrying out filtration separation, washing, drying, so as to obtain purple powder. The preparation method is simple, the synthesis conditions are easily controlled, and prepared O-TPB-DMTA-COF powder has a good glycopeptides enriching effect.

The invention discloses a lithium nickel cobalt manganese aluminate positive electrode material with a shell-core-shell structure and a preparation method of the lithium nickel cobalt manganese aluminate positive electrode material. The preparation method comprises the steps of taking Co-based MOF (zif-67) as a crystal nucleus for nickel, cobalt, manganese and aluminum coprecipitation reaction, generating a high-nickel quaternary component precursor with a core-shell structure, evenly mixing the precursor, lithium salt and an additive according to a certain proportion, calcining in an oxygen atmosphere furnace, and obtaining a primary sintered matrix; crushing, washing, filter-pressing and dehydrating the primary sintered matrix to obtain a filter cake containing certain moisture, uniformly mixing the filter cake and a coating material, drying at a low temperature, and carrying out secondary sintering in an oxygen atmosphere furnace to obtain the high-nickel quaternary component positive electrode material with a 'shell-core-shell' sandwich hollow structure. The positive electrode material not only has relatively high initial discharge specific capacity, relatively low internal resistance and relatively good rate capability, but also has good cycling stability and safety performance.

The invention relates to an anaerobic reactor. The anaerobic reactor comprises a cylinder body, a water inlet pipe, a water outlet pipe, a filling device on the middle part of the water outlet pipe, a water distribution device at the bottom of the filling device and a sludge discharge device at the bottom of the water distribution device; the water distribution device comprises a water distribution main pipe and more than four closed annular water distribution branch pipes; water outlet holes of the water distribution branch pipes are alternately arranged along more than three concentric circumferences; the cylinder body is positioned on the upper part of the filling device; the lower part of each water distribution branch pipe is provided with more than two water outlets; the water outlets are connected with the water outlet pipe; a reflowing pipe of the water outlet pipe is mixed with the water inlet pipe by a circulating pump and is communicated with the water distribution main pipe; a first medicating device and a second medicating device are communicated with the water inlet pipe respectively through connecting pipes; the filling device comprises a filling rack, a membrane hanging rack and a zonal biomembrane strip; the biomembrane strip is hung on the membrane hanging rack; and the sludge discharge device comprises a sludge discharge main pipe and six sludge discharge branch pipes arranged in length alternation along radial direction. The anaerobic reactor has the characteristics of reasonable water distribution, compact structure and stable operation of the reactor.

The invention discloses a lithium ion battery silicon oxygen anode paste, a preparation method thereof, a battery anode and a lithium ion battery, and belongs to the technical field of lithium ion battery manufacture. The lithium ion battery silicon oxygen anode paste comprises deionized water and a solid material. The solid materials comprises, with 100 total parts by weight, 93 to 97 parts of silicon-oxygen anode active material, 1 to 2 parts of CMC, binder of 1.2 to 2.0 times the CMC, and 1 to 2 parts of conductive agent SP. The solid material of the anode paste uses the 93 to 97 parts silicon-oxygen anode active material instead of the conventional graphite and the like. The prepared silicon-based anode has a much higher gram capacity than that of the graphite anode. The gram capacityof the anode active material can be greatly adjusted by adjusting the silicon content. The lithium ion battery silicon oxygen anode paste has stable later cycle stability, and high first effect.

The invention discloses high-concentration alcohol-based paint used in cast steel. The paint comprises 66-75% of refractory aggregates, 0.5-1.5% of a binder, 1.0-2.5% of a suspending agent, and 21-30% of isopropanol, wherein the refractory aggregates comprise 50-70% of white corundum, 20-40% of brown corundum, and 10-30% of mullite. The particle size distribution of the refractory aggregates is that: particles with diameters lower than 38mum accounts for 10-20%, particles with diameters of 38-53mum accounts for 40-60%, particles with diameters of 53-75mum accounts for 30-50%, and particles with diameters higher than 75mum accounts for 0-10%. According to the invention, the refractory aggregates with lower cost are intelligently selected for replacing a zircon powder aggregate, and characteristics of high refractory degree and surface fusion property are obtained as well. Also, the paint has large softening temperature zone. Through reasonable particle size selection and specific binder optimization, aggregate content is higher than 75%, such that excellent performance is obtained.

The invention belongs to the field of batteries, and particularly relates to an optimized thin-type and an electrode-tube-type seal power lead-acid storage battery. The optimized thin-type and the electrode-tube-type seal power lead-acid storage battery comprises a positive electrode plate and a negative electrode plate, wherein the positive electrode plate is made of a rare earth alloy, the negative electrode plate is prepared from the following raw materials: lead powder, barium sulfate, humic acid, complex tannin extract, carbon black, ion exchange water and vitriol. The invention also provides a preparation method of the optimized thin-type and an electrode-tube-type seal power lead-acid storage battery. The preparation method comprises the following steps: melting the rare earth element into the lead so as to prepare a positive plate grid, enabling a sheath and a dacron calandria to sleeve the grid, then filling the powder, smashing an upper back cover, soaking, solidifying and drying, so as to prepare the positive electrode plate; and after preparing the positive electrode plate and the negative electrode plate, assembling and forming the positive electrode plate and the negative electrode plate into a finished battery. The rare earth alloy is adopted by the positive electrode plate, so that the mechanical strength of the grid and the corrosion resistance of the grid are improved, the service life of the battery is prolonged, the complex formula of the negative electrode plate is used for improving the battery active substance use ratio and the battery capacity, and the low-temperature discharge performance of the battery is enhanced.

The invention discloses an adsorbing agent based on a carbon nanomaterial. The adsorbing agent is prepared from the carbon nanomaterial and an adhesive, wherein the mass fraction of the carbon nanomaterial ranges from 30 to 95 percent. The specific surface area of the adsorbing agent is 100 to 2000m<2> / g, and the pore volume proportion of micropores, mesopores to macropores is (1 to 2) to (1 to 5) to (1 to 20). The invention also discloses a method for preparing the adsorbing agent by adding a pore-forming agent. The adsorbing agent has the advantages of long service life, big treatment capacity, low preparation cost and the like, and is suitable for adsorbing non-polar organic compounds in a fluid.

The invention discloses a silicon carbide / hafnium carbide nanowire modified silicon carbide coating enhanced graphene honeycomb-based nano aerogel heat-insulating and wave-absorbing composite material, which is composed of silicon carbide coating enhanced graphene honeycomb, silicon carbide / hafnium carbide nanowires and nano aerogel, firstly, a silicon carbide coating is prepared on the surface of a graphene honeycomb through a chemical vapor deposition process, and then internal pores of the graphene honeycomb are reinforced on the silicon carbide coating through a chemical liquid vapor deposition process to prepare the silicon carbide / hafnium carbide nanowire. And finally, nano aerogel is prepared on the surfaces of the silicon carbide / hafnium carbide nanowires through a sol-gel process, a supercritical drying technology and a carbonization reaction, a formed three-dimensional network structure can effectively block heat transmission and promote the absorption and dissipation effects on electromagnetic waves, and the heat insulation and wave absorption performance of the composite material is cooperatively provided.

The invention discloses a production method of a cold-solidified rusted pellet. The production method comprises the following steps: step a, manufacturing a pellet; step b, pre-maintaining the pellet, namely sending the manufactured raw pellet to a belt maintainer in a condition that the thickness of a pellet material layer is 100mm to 300mm, supplying hot air or hot smoke to the belt maintainer, ensuring that the temperature of the pellet material layer is 30 to 50 DEG C, maintaining for 8-24 hours, controlling the flow rate of the hot air or the hot smoke, and ensuring that the water content of the maintained pellet is 5wt% to 7wt% and the strength of each pellet is larger than or equal to 150N; step c, performing steam maintenance; step d, supplying water and supplying air for maintenance; step e, after 4 to 5 days of pellet pre-maintenance, steam maintenance and water-supplied and air-supplied maintenance, screening to obtain the cold-solidified rusted pellet. The cold-solidified rusted pellet produced by the method disclosed by the invention is remarkably improved in compression strength after the raw pellet is pre-maintained and is convenient for subsequent large-scale production.

The invention discloses a process for preparing composite materials for removing arsenic from red mud. The process is characterized by comprising the steps of (1) adding the red mud slurry as raw materials to a diluted hydrochloric acid solution, heating to 80 DEG C-90 DEG C, and stirring; (2) after stirring, then cooling the mixture, filtering pickled red mud solids and filtrate, and then washing red mud solids with water; and (3) adding a reducing agent into red mud solids washed with water in step (2), carrying out a reduction reaction, and filtering after the reduction reaction is completed to obtain the obtained composite material for removing arsenic. Since the industrial red mud waste is used as the raw materials, the process disclosed by the method is environment friendly; the convenient preparation process is convenient and rapid and is conducive to large-scale production, and the obtained composite material has an excellent arsenic removal effect.

The invention discloses a gold micro-nano structure array and preparation method as well as application thereof. The array comprises a substrate coated with a gold film, a gold microprism array is arranged on the gold film, tops of gold microprisms forming the gold microprism array are hemispheric; each gold microprism with the hemispheric top has the prismdiameter of 200nm-3[mu]m and the prism height of 300nm-6[mu]m, and is composed of gold nano particles; and the particle size of the gold nano particles is 3-30nm. The method comprises the following steps of: firstly, forming the gold film on the substrate through sputtering, then, adding the substrate coated with the gold film into a gold electrolyte as a cathode, performing electrodeposition for 8-20 hours with 30-500[mu]A / cm<2> direct current, wherein, the gold electrolyte is a mixed solution of 0.2-5g / L chloroauric acid solution and 2-50g / L polyvinyl pyrrolidone solution, thereby obtaining the target product. The gold micro-nano structure array can be used as an SERS (Surface Enhanced Raman Scattering) active substrate, and the content of rhodamine or methyl parathion attached on the gold micro-nano structure array is measured through a laser Raman spectrometer.

The invention discloses a TEMPO oxidation modified straw fiber material, a preparation method and application thereof, and relates to the technical field of environmental remediation, wherein the TEMPO oxidation modified straw fiber material can efficiently adsorb heavy metals Cd and sulfamethoxazole. The preparation method comprises the following steps: adding a TEMPO oxidizing agent and sodium chlorite into 60-mesh corn straw in a buffer solution with the pH value of 6.86, adding sodium hypochlorite to start an oxidation reaction after complete dissolution, adding 10 ml of absolute ethyl alcohol after the reaction is finished, carrying out suction filtration with deionized water until the solution is neutral, and airing at room temperature.

The invention provides a catalyst carrier treatment method, a catalyst for preparing methanol through carbon dioxide hydrogenation and a preparation method and application of the catalyst, which relate to the technical field of catalysts. The treatment method provided by the invention comprises the following steps of grinding and mixing a catalyst carrier and NaBH4 to obtain a mixture, roasting the mixture under a protective atmosphere condition to obtain a roasted material, and sequentially washing and freeze-drying the roasted material to obtain the treated catalyst carrier. By adopting the method provided by the invention to treat the catalyst carrier, the catalytic activity of the catalyst can be improved, and the conversion rate of carbon dioxide and the selectivity of methanol are improved. In addition, the treatment method provided by the invention is simple, easy to operate and short in production period.

The invention provides a method for improving wet process formability and sinterability of ceramic nano-powder and belongs to the field of ceramic preparation. According to the invention, ceramic nano-powder is treated by the combination of pelleting and calcining, on the one hand, the nanoscale and high activity (high crystal boundary area has high sintering promoting power) of the ceramic nano-powder are kept, on the other hand, multiple primary particles are controllably calcined together to form second particles (polycrystals or single grain crystals), and therefore, the particles (grain crystals) of the ceramic nano-powder are enlarged, and forming becomes easy. Meanwhile, the crystalline degree of the particles of the ceramic nano-powder is increased by calcining, defects on the surfaces of the particles are reduced, original microcrystals with multiple surface defects (uneven surface) are transformed into microcrystals with relatively smooth surfaces, the specific surface area is reduced, a sizing agent reaches a relatively high solid content in wet process forming, the density of a formed green body is greatly improved, and further a dense sintering body is obtained at relatively low temperature, and the bottleneck problem of difficulty in forming and sintering of the ceramic nano-powder can be effectively solved.

The invention discloses a nanometer zirconia abrasion sealing composite paint material, which comprises the following parts: base-phase material, filling material A, filling material B, adhesive and water, wherein the base-phase material is 70-75% in the base-phase material, filling material A and filling material B; the filling material A is 14-20% in the base-phase material, filling material A and filling material B; the filling material B is 9-15% in the base-phase material, filling material A and filling material B; the adhesive is 2-5.5% in the base-phase material, filling material A and filling material B; the water is 70-78% in the base-phase material, filling material A, filling material B and adhesive.

The invention discloses a composite adsorbing material and a preparation method and application thereof. Active groups such as carboxyl and hydroxyl existing in polyvinyl alcohol, humic acid and acrylic acid structures and hydroxyl groups existing in montmorillonite structures are utilized to be in contact with pollutants, and hydrogen bonds, electrostatic attraction and chelation are combined, therefore, the purpose of removing pollutants is achieved. Meanwhile, a combination place is provided for adsorption of pollutants by utilizing a layered structure and a relatively large specific surface area of montmorillonite, and after freezing and unfreezing treatment is carried out for multiple times, the formation of a porous structure of the composite adsorption material is facilitated, the specific surface area of the material is increased, the subsequent improvement of the treatment performance of the pollutants is facilitated, and finally, through freeze drying, the porous structure of the material is maintained, the composite adsorbing material with the porous structure is finally obtained, the adsorbing material is environmentally friendly and can be recycled, the synthetic raw materials are low in price, the synthetic process is simple, the reaction condition requirement is low, and the operability is high.

The invention discloses a functionalized silicon oxide composite material with a mesoporous structure based on phosphotungstic acid and sulfonic acid and a preparation method, and belongs to the technical field of composite materials. The structure of the composite material provided by the invention is pr-SO3H-OMS / H3PW12O40. According to the composite material, an ordered mesoporous silicon-basedmaterial OMS is used as a carrier, two active ingredients, namely Keggin type phosphotungstic acid and propyl sulfonic acid, are loaded on the carrier, the ordered mesoporous silica-based hybrid material OMS is formed by co-condensing an organic silicon source (3-mercaptopropyl) triethoxysilane (MPTES) and an inorganic silicon source tetraethoxysilane (TEOS), and the loading capacity of phosphotungstic acid is 17.04 wt% to 24.65 wt%. The pr-SO3H-OMS / H3PW12O40 composite material is designed and prepared by combining a one-step hydrolytic co-condensation method and a hydrothermal treatment technology, the use of hydrochloric acid in the traditional ordered mesoporous silicon-based material preparation process is abandoned, the preparation process is simple, and the process is pollution-free.Due to the synergistic effect between propyl sulfonic acid groups and phosphotungstic acid, the pr-SO3H-OMS / H3PW12O40 catalyst with double acidic sites shows very high catalytic activity on esterification reaction of oleic acid and methanol, the reaction conversion rate is high, the product purity is high, the reaction process is clean and pollution-free, and the reusability of the catalyst is good.

The invention discloses a graphene-coated lithium iron phosphate composite material and a preparation method thereof, and belongs to the technical field of lithium ion batteries. The preparation method comprises the following steps: coating graphene oxide and lithium iron phosphate by adopting spray drying or evaporation drying to prepare a graphene-coated lithium iron phosphate solid, and carrying out heat treatment on the obtained graphene-coated lithium iron phosphate solid to prepare a graphene-coated lithium iron phosphate composite material, wherein the ratio of the sheet diameter of the graphene oxide to the D50 of the lithium iron phosphate is 0.05-40. According to the preparation method, the specific surface area of the obtained graphene-coated lithium iron phosphate composite material is effectively controlled by controlling the matching of the sheet diameter of graphene oxide and the particle size of lithium iron phosphate, and the processability of the coated material is greatly improved. Meanwhile, the resistivity of the prepared graphene-coated lithium iron phosphate composite material is reduced, and the charge-discharge performance of the material under high multiplying power can be improved.

The invention relates to an anaerobic reactor. The anaerobic reactor comprises a cylinder body, a water inlet pipe, a water outlet pipe, a filling device on the middle part of the water outlet pipe, a water distribution device at the bottom of the filling device and a sludge discharge device at the bottom of the water distribution device; the water distribution device comprises a water distribution main pipe and more than four closed annular water distribution branch pipes; water outlet holes of the water distribution branch pipes are alternately arranged along more than three concentric circumferences; the cylinder body is positioned on the upper part of the filling device; the lower part of each water distribution branch pipe is provided with more than two water outlets; the water outlets are connected with the water outlet pipe; a reflowing pipe of the water outlet pipe is mixed with the water inlet pipe by a circulating pump and is communicated with the water distribution main pipe; a first medicating device and a second medicating device are communicated with the water inlet pipe respectively through connecting pipes; the filling device comprises a filling rack, a membrane hanging rack and a zonal biomembrane strip; the biomembrane strip is hung on the membrane hanging rack; and the sludge discharge device comprises a sludge discharge main pipe and six sludge discharge branch pipes arranged in length alternation along radial direction. The anaerobic reactor has the characteristics of reasonable water distribution, compact structure and stable operation of the reactor.

The invention discloses a production method of a cold-solidified rusted pellet. The production method comprises the following steps: step a, manufacturing a pellet; step b, pre-maintaining the pellet, namely sending the manufactured raw pellet to a belt maintainer in a condition that the thickness of a pellet material layer is 100mm to 300mm, supplying hot air or hot smoke to the belt maintainer, ensuring that the temperature of the pellet material layer is 30 to 50 DEG C, maintaining for 8-24 hours, controlling the flow rate of the hot air or the hot smoke, and ensuring that the water content of the maintained pellet is 5wt% to 7wt% and the strength of each pellet is larger than or equal to 150N; step c, performing steam maintenance; step d, supplying water and supplying air for maintenance; step e, after 4 to 5 days of pellet pre-maintenance, steam maintenance and water-supplied and air-supplied maintenance, screening to obtain the cold-solidified rusted pellet. The cold-solidified rusted pellet produced by the method disclosed by the invention is remarkably improved in compression strength after the raw pellet is pre-maintained and is convenient for subsequent large-scale production.

The invention discloses a hydroxyapatite-coating PRB filling material and a preparing method and underground-water uranium removing application method thereof. The hydroxyapatite-coating PRB filling material is characterized in that the hydroxyapatite-coating PRB filling material is prepared with a silicon-containing and / or calcium-containing inert natural material as a body and a H3PO4 solution, a Ca(NO3)2.4H2O solution and a NH3.H2O solution as synthetic materials, wherein the particle size of the silicon-containing and / or calcium-containing inert natural material is larger than 100 mesh, and the mass ratio of hydroxyapatite to an inert material is (0.1-0.5):1. According to the hydroxyapatite-coating PRB filling material and the preparing method and underground-water uranium removing application method thereof, coating is carried out with a local inert material; as adsorption is generated on the surface of the material, the adsorption capacity of an adsorbent cannot be reduced when the surface of the inert material is coated with an active material; a PRB reactive barrier is buried into an underground-water flow channel and used for PRB uranium removing, and uranium pollution abatement in underground water is achieved; blocking of iron carbonyl can be avoided, and the hydroxyapatite-coating PRB filling material can also be recycled.

The invention discloses a kit for detecting rhinoviruses, respiratory syncytial viruses and parainfluenza viruses by a micro-fluidic chip and an application method of the kit. The kit comprises the multi-flux microfluidic nucleic acid detection chip, a preloaded dry powder testing agent and a positive quality control. The multi-flux microfluidic nucleic acid detection chip is used for controllingflow passages actively. The preloaded dry powder testing agent comprises a primer for specific conserved sequences of the rhinoviruses, the respiratory syncytial viruses and the parainfluenza virusesand a TagMan fluorescence probe. The kit has the advantages that the micro-fluidic chip technology is applied, all operations are completed by instruments after sample loading, convenience and simplicity in operation and high speed are realized, detection can be completed within 30-60 minutes, and pollution is avoided; the TagMan fluorescence probe PCR technology is applied to detect the rhinoviruses, the respiratory syncytial viruses and the parainfluenza viruses; designed primer and probe sequences are quite conservative in genes of the rhinoviruses, the respiratory syncytial viruses and theparainfluenza viruses, high specificity is achieved, detection results can be acquired within two hours, and sensitivity can reach 10copies / microliter.

The invention relates to an adsorbent for a nuclear biochemical agent, a fabric and a manufacturing process. The adsorbent includes a matrix, powdered activated carbon, a solvent and a soluble microparticle filling material; the powdered activated carbon is mixed in the matrix and adsorbs toxic substances; the solvent is mixed in the matrix and mixed with the powdered activated carbon in the matrix; and the soluble microparticle filling material consists of multiple microparticles mixed with the solvent in the matrix and adhering to the powdered activated carbon, and can be extracted and removed from the hardened matrix, so that pores formed by bubble-shaped holes can be provided for the matrix. The pores can be provided for the outer peripheral face of the activated carbon through the microparticle filling material.

The invention relates to a sediment / zeolite nitrogen control material prepared from lake sediment, a method and application thereof. The method includes: collecting lake sediment as the raw material, conducting freeze drying, grinding and sieving to obtain sediment powder for standby use; taking zeolite, conducting grinding and sieving to obtain zeolite powder for standby use; then subjecting the treated sediment powder to constant temperature heating treatment, and then performing cooling for standby use; adding the zeolite powder into the sediment powder in proportion, mixing the substances evenly, then adding water to infiltrate the mixed raw materials, carrying out extrusion molding and roasting so as to obtain the sediment / zeolite nitrogen control material. The method provided by the invention adopts lake sediment as the raw material, and combines zeolite, so that the sediment / zeolite nitrogen control material has significantly improved ammonia nitrogen adsorption performance and significantly decreased ammonia nitrogen desorption capacity. The raw materials are cheap, the safety is high, the social and economical benefits are good, also the material has no ecological risk to lake water, is energy saving and environment-friendly, and can significantly reduce the ammonia nitrogen concentration of sediment interstitial water in the application process to achieve the purpose of impeded control of lake sediment ammonia nitrogen release.

The invention discloses a nanowire array modified graphene honeycomb reinforced nano aerogel heat-insulating and wave-absorbing composite material, which is composed of graphene honeycomb, nanowire array and nano aerogel, and is characterized in that a silicon carbide coating is prepared on the surface of the graphene honeycomb through a chemical vapor deposition process for reinforcement, and the silicon carbide coating is in discontinuous distribution; then preparing a nanowire array in pores in the graphene honeycomb through a chemical liquid phase deposition process, and finally preparing nano aerogel on the surface of the nanowire array through a sol-gel process, a supercritical drying technology and a carbonization reaction, the formed three-dimensional network structure can effectively block heat transmission and promote absorption and dissipation of electromagnetic waves, and synergistically provides heat insulation and wave absorption performance of the composite material.

The invention provides a method for treating a catalyst carrier, a catalyst for hydrogenation of carbon dioxide to produce methanol, a preparation method and application thereof, and relates to the technical field of catalysts. The processing method provided by the invention comprises the following steps: the catalyst carrier and NaBH 4 Grinding and mixing to obtain a mixture; roasting the mixture under protective atmosphere conditions to obtain a roasted material; washing and freeze-drying the roasted material in sequence to obtain a treated catalyst carrier. By adopting the method provided by the invention to treat the catalyst carrier, the catalytic activity of the catalyst can be improved, and the conversion rate of carbon dioxide and the selectivity of methanol can be improved. In addition, the treatment method provided by the invention is simple, easy to operate, and has a short production cycle.

The invention provides a method for improving wet process formability and sinterability of ceramic nano-powder and belongs to the field of ceramic preparation. According to the invention, ceramic nano-powder is treated by the combination of pelleting and calcining, on the one hand, the nanoscale and high activity (high crystal boundary area has high sintering promoting power) of the ceramic nano-powder are kept, on the other hand, multiple primary particles are controllably calcined together to form second particles (polycrystals or single grain crystals), and therefore, the particles (grain crystals) of the ceramic nano-powder are enlarged, and forming becomes easy. Meanwhile, the crystalline degree of the particles of the ceramic nano-powder is increased by calcining, defects on the surfaces of the particles are reduced, original microcrystals with multiple surface defects (uneven surface) are transformed into microcrystals with relatively smooth surfaces, the specific surface area is reduced, a sizing agent reaches a relatively high solid content in wet process forming, the density of a formed green body is greatly improved, and further a dense sintering body is obtained at relatively low temperature, and the bottleneck problem of difficulty in forming and sintering of the ceramic nano-powder can be effectively solved.