1037 results about "Sodium borohydrate" patented technology

The invention discloses a cobalt-loaded covalent organic framework material as well as a preparation method and application thereof, and belongs to the technical field of catalyst preparation. The cobalt-loaded covalent organic framework material is prepared by taking a carbonized covalent organic framework as a matrix and cobalt nitrate hexahydrate as a cobalt source, reducing by using a sodium borohydride methanol solution, and introducing transition metal cobalt into the framework through room-temperature impregnation and thermal reduction processes. In the material, active components comprise Co0 and Co < 2 + > which are uniformly distributed on a carrier. Moreover, the metal cobalt is stably loaded in a carbon skeleton through the bonding effect of heteroatoms such as nitrogen and carbon, so that the stability, the catalytic activity and the durability of the metal cobalt are effectively improved, the dissolution risk of the metal cobalt is reduced, the hidden danger of environmental pollution is reduced, and efficient catalytic activity is shown in the aspect of catalyzing and activating peroxymonosulfate to degrade organic pollutants; and good recycling stability is achieved.

The invention provides conductive paste for a heterojunction solar cell and a preparation method of the conductive paste, and belongs to the field of conductive paste. The spherical nano-silver, the silver nanowires and the silver nanosheets are introduced, a three-dimensional conductive network is formed through three metal shapes, the conductivity of the paste is remarkably improved, high stability is kept in long-term use through the synergistic effect, and degradation of the conductivity is avoided; the carbon nanotubes are modified through mixed acid and a coupling agent, so that the dispersity is improved, the interface bonding force is enhanced, and the conductivity and mechanical strength of the slurry are improved; according to the graphene, the dispersity and compatibility are improved through introduction of sulfydryl, and the conductivity is restored through reduction of sodium borohydride; silver-coated silicon carbide is used as a filler to improve conductivity, retain hardness of silicon carbide, enhance wear resistance of the slurry and prolong service life; through the synergistic effect of the modified carbon nanotubes, the modified graphene and the silver-coated silicon carbide, the paste shows excellent performance in the aspects of conductivity, thermal stability and mechanical strength.

The invention discloses a phosphorus removal filler and a preparation method and application thereof, and belongs to the technical field of fillers. Sulphoaluminate cement, chitosan, sodium alginate and calcium peroxide are uniformly mixed in a nitric acid solution in an amino-containing coupling agent, then foaming and pore forming are performed under steam, and the phosphorus removal filler is prepared. And finally, uniformly mixing with titanium dioxide, sodium silicate, a ferrous sulfate solution and sodium borohydride to obtain the phosphorus removal filler with an excellent phosphorus removal effect, and the phosphorus removal filler has a rich pore structure and adsorption activity, can sufficiently perform physical adsorption on phosphorus elements, and has a good phosphorus removal effect. Meanwhile, the phosphorus removal filler further has excellent surface complexing activity and photocatalysis, insoluble salt precipitates can be generated through reaction of iron elements and calcium elements and phosphate in water, so that total phosphorus is removed, the material is ground after adsorption saturation and put into a fish pond to serve as a phosphorus supplementing material, resource recycling can be achieved, and the cost is reduced. Wide application prospects are realized.

The present invention relates to the technical field of nanofiltration membranes, and particularly relates to a preparation method for a positively charged nanofiltration membrane for improving a "trade-off" effect. The preparation method comprises the following process: sequentially adding a water phase and an oil phase to the surface of a support layer to perform a reaction, so as to prepare a polyamide layer; pouring in a functionalized graphene dispersion; and sequentially placing same into an N,N-dimethyl propane diamine solution, a sodium borohydride solution and an iodomethane solution to perform a reaction, so as to obtain a nanofiltration membrane, wherein the functionalized graphene is pyrrolidone-based graphene. According to the present invention, a mixture of piperazine and polyethyleneimine is used as a water phase and is subjected to interfacial polymerization with an oil phase 1,3,5-trimesoyl chloride on the surface of the support membrane; and by means of the compounding of micromolecular piperazine and macromolecular polyethyleneimine, the rapid formation of a polyamide layer is promoted, the distance of a system cross-linked network is increased, a positively charged polyamide layer having a large pore diameter and good hydrophilicity is formed, and a good water flux and a good rejection rate are achieved, thereby improving the "trade-off" effect.

The present invention provides a method for preparing a carbon-containing lithium sulfide composite material, the method comprising: in a water-free and oxygen-free environment of a vacuum glove box, weighing a certain amount of lithium source and sulfur source, putting them into a ball mill, and then adding sodium borohydride according to a set ratio to mix evenly; sealing the ball mill, and passing an inert gas after evacuation, and then ball milling for a certain time at a set speed and after the ball milling is completed, taking out the lithium sulfide solid under the protection of the inert gas; dissolving and filtering the obtained lithium sulfide solid in anhydrous ethanol, and adding a certain amount of carbon source to the filtrate, stirring, and ultrasonic treatment; heating and evaporating to remove the solvent, and obtaining a solid Li2S / C precursor; placing the Li2S / C precursor in a vacuum freeze dryer, and freeze-drying to remove residual moisture to obtain a Li2S / C composite material. The present invention solves the problems of high cost and low purity when preparing lithium sulfide in the prior art.

The invention relates to the technical field of biomedical treatment, and particularly discloses a biological valve treatment method and a biological valve dry piece. The bioprosthetic valve treatment method provided by the invention comprises the following steps: pretreatment, crosslinking, degreasing, anti-calcification and drying. In the anti-calcification step, an anti-calcification solution is used for treatment; the anti-calcification solution is a 0.08 to 0.12 M PBS (Phosphate Buffer Solution) containing 0.5 to 6 weight percent of ethanolamine and 0.1 to 0.5 weight percent of sodium borohydride; furthermore, the anti-calcification solution is a 0.08 to 0.12 M PBS (Phosphate Buffer Solution) containing 2 to 4 weight percent of ethanolamine and 0.2 to 0.4 weight percent of sodium borohydride; the invention further provides the bioprosthetic valve dry piece obtained through the bioprosthetic valve processing method. According to the bioprosthetic valve treatment method, the anti-calcification performance of the bioprosthetic valve can be improved, and the obtained bioprosthetic valve dry piece has good stability and storage performance.

The invention discloses a preparation method of nano silver powder, which comprises the following steps: under a stirring condition, respectively dissolving silver nitrate, a complexing agent and a reducing agent in deionized water to respectively obtain a silver nitrate solution, a complexing agent solution and a reducing agent solution with the concentration of 150-400g / L, dropwise adding the complexing agent solution into the silver nitrate solution, and stirring to obtain a nano silver powder solution; the preparation method comprises the following steps: adding a reducing agent solution into a reaction kettle, reacting to obtain a silver complexing solution, dropwise adding the silver complexing solution into the reducing agent solution, reacting to generate a silver simple substance, and carrying out solid-liquid separation, washing and drying on the silver simple substance to obtain spherical nano silver powder; according to the preparation method, reaction is carried out in a water system, a high-molecular compound is not used as a dispersing agent, potassium borohydride, sodium borohydride and vitamin C are used as reducing agents to reduce the silver complex, the prepared silver powder is good in dispersing performance, particles are spherical, the purity is high, the sintering resistance is low, the preparation method is simple, and the yield of the silver powder is as high as 97% or above.

The invention discloses a nano-silver intercalation covalent organic frame polymer and application thereof, and belongs to the technical field of biological medicine. The nano-silver intercalation covalent organic frame polymer PP-COF-Ag is a porous material which is formed by taking 4, 5-dihydropyrene-4, 5-diketone and tetraaminophenyl porphyrin as structural units and stacking lamellae, and the nano-silver intercalation covalent organic frame polymer PP-COF-Ag is a nano-silver intercalation covalent organic frame polymer PP-COF-Ag. And silver nanoparticles are inserted into the lamellae of the nano-silver intercalation covalent organic frame polymer. The preparation method comprises the following steps: enabling 4, 5-dihydropyrene-4, 5-diketone and tetraaminophenyl porphyrin to react to obtain black powder PP-COF; the PP-COF reacts with a silver nitrate solution, then a sodium borohydride methanol solution is dropwise added to reduce silver, and the PP-COF-Ag is obtained. The insertion of the nano-silver increases the interlayer spacing of the original covalent organic framework, and the nano-silver, photo-thermal therapy and photodynamic therapy can be combined to resist bacteria, and the nano-silver covalent organic framework is good in biocompatibility and free of toxic and side effects.

The invention relates to an iron oxide homogeneous and heterogeneous photoelectric self-Fenton electrode material as well as a preparation method and application thereof, the self-Fenton electrode material comprises a carbon fiber cloth matrix and an active alpha / beta-Fe2O3 homojunction grown on the carbon fiber cloth in situ, and the structure of the self-Fenton electrode material is shown as alpha / beta-Fe2O3 / CC. The alpha / beta-Fe2O3 homojunction is formed by compounding two phases, namely, alpha-Fe2O3 and beta-Fe2O3. And the alpha / beta-Fe2O3 / CC has an oxygen vacancy. The preparation method comprises the following steps: soaking a pretreated carbon fiber cloth substrate in an alpha / beta-Fe2O3 precursor solution prepared in advance for reaction, and after the reaction is finished, carrying out post-treatment to obtain FeOOH / CC; calcining the FeOOH / CC, and cooling to obtain alpha / beta-Fe2O3 / CC; the alpha / beta-Fe2O3 / CC can introduce oxygen vacancies through reduction activation treatment of a sodium borohydride aqueous solution. Compared with the prior art, H2O2 can be generated in situ, sustainable circulation from Fe < 3 + > to Fe < 2 + > is enhanced, generation of hydroxyl radicals in the self-Fenton reaction is promoted, and the degradation reaction speed and efficiency of organic pollutants, especially antibiotics are greatly improved.

The present invention provides a method for preparing catalytic particles and using them for increased sensitivity in lateral flow immunoassays. Palladium salt is reduced in the presence of a protein using sodium borohydride as a reducing agent to form brown or gray particles. These particles catalytically develop a dye to detect the presence of an analyte.

The invention relates to a metallized microbubble and a preparation method thereof, a construction method of a multifunctional composite probe, and a rapid bacterium capturing and sterilizing method, and belongs to the technical field of functional material preparation. The method aims at solving the technical problems that in the prior art, a metal coating on the surface of the hollow glass microbubble is not uniform, combination is not firm, and stability is poor. According to the technical scheme, the method is characterized by comprising the following steps: mixing surface-activated hollow glass microbubbles with a polyethyleneimine solution for reaction, and washing and drying to obtain polyethyleneimine-coated hollow glass microbubbles; then reacting with a single-stranded DNA buffer solution to obtain an intermediate product loaded with DNA; then introducing a silver nitrate solution to load silver ions on the surface of the compound; and finally, reducing through a sodium borohydride solution to prepare the metallized microbubbles. The metalized microbubbles prepared by the method can be used for constructing a multifunctional composite probe to realize efficient capture and synergistic antibiosis of targets such as bacteria.

The invention belongs to the technical field of nano composite materials, and discloses a novel transition metal-inserted transition metal sulfide composite rare earth oxide photocatalytic material with a solid mediator Z-type heterostructure, and a preparation method and application of the novel transition metal-inserted transition metal sulfide composite rare earth oxide photocatalytic material. The preparation method comprises the following steps: mixing transition metal salt, thioacetamide, nitrate hexahydrate and water to obtain a mixed solution 1; mixing the mixed solution 1 with a hydrazine hydrate solution, and performing hydrothermal reaction to obtain a mixed solution 2; mixing the mixed solution 2 with ammonia water, and sequentially carrying out hydrothermal reaction, drying and calcining to obtain a calcined product; and mixing the calcined product with a sodium borohydride aqueous solution, and drying to obtain the photocatalytic material. The obtained photocatalytic material of the transition metal inserted transition metal sulfide composite rare earth oxide with the solid mediator Z-type body heterostructure has the characteristics of high stability, safe interface contact and rapid charge migration.

The invention relates to the technical field of catalysts and methanol preparation through CO2 hydrogenation, in particular to a preparation method of a catalyst, a product and application. The preparation method of the catalyst comprises the following steps: adding a copper-zinc-aluminum catalyst into a cerous nitrate aqueous solution, uniformly mixing, and stirring in a water bath to obtain a mixed solution; adding an alkali solution of NaBH4 into the mixed solution, and reacting to obtain a precipitate; and carrying out ultrasonic treatment on the precipitate, washing, drying, grinding and roasting to obtain the catalyst. The assistant Ce is introduced into the copper-zinc-aluminum catalyst, sodium borohydride (NaBH4) is used for reduction, Ce < 4 + > / Ce < 3 + > and Cu < 2 + > / Cu < delta + > / Cu < 0 > redox electron pairs are constructed, an electron transfer pathway is established, and the catalytic performance of methanol preparation through CO2 hydrogenation is improved.

The invention discloses preparation of a layered mesoporous Pd-Cu nano-catalyst and a method for preparing glycollic acid from PET hydrolysate through electro-oxidation under environmental conditions, and belongs to the technical field of catalysts. The preparation method comprises the following steps: dissolving CTAB (Cetyltrimethyl Ammonium Bromide) serving as a surfactant in a cosolvent of water and TMB (Tetramethylbenzidine), sequentially adding NH4PdCl4 and Cu (NO3) 2.3 H2O serving as metal precursors into a reaction solution, and finally synthesizing the layered mesoporous Pd-Cu by virtue of a reduction effect of sodium borohydride and an in-situ nucleation and adhesion method. Continuous electro-catalysis is carried out in a pulse mode, selective desorption of GA is dynamically accelerated, and new active sites of a metal catalyst are exposed. The electric pulse catalysis can promote the desorption of the product, prevent poisoning, and further improve the stability and selectivity of the catalyst. The method shows excellent glycollic acid Faraday efficiency, high generation rate and excellent cycle stability under a wide potential window, 20 times of electro-catalysis PET upgrading cycles are achieved, and upgrading utilization of PET waste and efficient generation of glycollic acid are achieved.

The invention belongs to the technical field of oilfield development, and relates to an oilfield high-temperature-resistant discharge aiding agent and a synthesis method and application thereof. The preparation method comprises the following steps: sequentially adding diaza 18-crown ether-6, ethanol and benzaldehyde-2, 4-sodium disulfonate into a reactor, stirring and dissolving, continuously adding sodium cyanoborohydride, stirring and dissolving, adjusting the pH value to 3-4 by using hydrochloric acid, heating at 70-80 DEG C, and keeping the temperature to react for 2-4 hours; cooling to below 20 DEG C, slowly dropwise adding hydrochloric acid, adjusting the pH value to 0-1, stirring for 20-30 minutes, and destroying the residual sodium cyanoborohydride; adjusting the pH value to 9-10 by using sodium hydroxide, adding dodecyl bromide, and heating and refluxing for 24-48 hours; and carrying out reduced pressure distillation to obtain a viscous solid, recrystallizing, and drying to obtain the product high-temperature discharge aiding agent. The high-temperature-resistant discharge aiding agent has the advantages of low surface tension, low interfacial tension, low critical micelle concentration and high flowback rate.

The invention relates to the technical field of electro-catalysis materials, and discloses an iron-doped copper oxide catalyst, a preparation method thereof and application of the iron-doped copper oxide catalyst in electro-catalysis of nitrate to synthesize ammonia. The method comprises the steps that CuCl2 serves as a metal precursor, ascorbic acid serves as a reducing agent, and Cu2O nanoparticles are obtained through a hydrothermal precipitation method; then, Cu2O is added into a solution containing FeSO4, sodium borohydride is added, centrifugal washing and drying are carried out, and the iron-doped copper oxide nitrate electroreduction catalyst which is rich in defects and uniform in metal dispersion is obtained through a programmed heating pyrolysis reduction method. The electro-catalytic material obtained by adopting the method disclosed by the invention has a relatively large catalytic active area and relatively abundant defect sites and oxygen vacancies, the nitrate adsorption and activation effects are improved, the supply of active hydrogen is promoted by constructing stable heterogeneous active sites, the product selectivity and Faraday efficiency in NO3RR are improved, and the electro-catalytic material has good durability.

The utility model belongs to the technical field of chemical engineering, and particularly relates to automatic sodium borohydride feeding and conveying equipment which comprises an automatic bale breaker, a bag breaking machine is arranged at a feeding port of the automatic bale breaker, a feeding port of the bag breaking machine is arranged at a discharging port of a belt conveyor, a mechanical arm is located on one side of a feeding port of the belt conveyor, and a dust remover is connected to the middle of the upper surface of the automatic bale breaker. A spiral screening barrel is installed in the device, a waste bag outlet is formed in a discharging port, a discharging hopper is arranged in the middle of the lower surface of the device, the lower portion of the discharging hopper is connected with a scattering barrel through a discharging pipe, the left portion of the lower side of the scattering barrel is connected with a nitrogen supplementing pipe, and the right side of the scattering barrel is connected with a negative pressure pneumatic conveyor through a conveying pipe. The upper part of the right side of the scattering barrel is connected with a fan through an air pipe, and an outlet of the fan is communicated with the right part of the upper side of the scattering barrel through a nitrogen return pipe. According to the equipment, full-automatic unpacking and conveying are achieved, materials are scattered to avoid caking, dust leakage is avoided, nitrogen conveying forms a closed loop, and energy consumption is low.

The invention discloses an electromagnetic shielding fabric and a preparation method thereof, and relates to the technical field of fabrics. The bismuth ion-doped polyimide is used as an external phase spinning solution, contains a large number of benzene ring structures, has a certain shielding effect on electromagnetism, does not generate radiation crosslinking and chemical degradation reactions after being subjected to high-energy radiation, and has a good electromagnetic shielding effect; then, carboxylated graphene oxide, barium ions and iron ions generate electrostatic adsorption, so that ferrite is loaded on a graphene sheet layer, a synergistic shielding effect is generated, the electromagnetic shielding effect of the fabric is improved, the graphene sheet layer serves as an inner phase, polyimide serves as an outer phase, gel fibers of a core-shell structure are prepared through spinning, a double-layer electromagnetic wave absorption path is constructed, and the electromagnetic shielding effect of the fabric is improved. Then under the reduction action of sodium borohydride, a layer of uniform metal bismuth is formed on the surface of the fiber, the electromagnetic shielding performance of the fabric is improved, then through drying, the gel on the inner layer forms a porous aerogel structure, the pores of the aerogel structure are communicated with the pores of the fiber, and the air permeability of the fabric is improved.

The invention discloses a preparation method and application of a platinum-copper cross-linked nanowire, and the method comprises the following steps: preparing a platinum precursor solution and a copper precursor solution, injecting into an aqueous solution, and uniformly mixing; taking a freshly prepared sodium borohydride aqueous solution as a reducing agent and a hydrogen source, quickly injecting into the mixed solution, reacting in a low-temperature water bath for several hours, collecting black precipitates at the bottom of a reaction container, and centrifugally washing with a water-alcohol mixture to obtain the platinum-copper cross-linked nanowire. The scheme is carried out in an aqueous solution without a surfactant, the surface of the prepared nanowire is clean, the post-treatment is simple, and the diameter of the prepared platinum-copper cross-linked nanowire can be 4-5nm; the platinum-copper cross-linked nanowire can be applied to electro-catalysis methanol oxidation reaction, and has high activity, good carbon monoxide poisoning resistance and good stability.

The invention provides a GelMA microneedle patch loaded with chromogenic gold nano bipyramids and a preparation method thereof.The method comprises the steps that citric acid, chloroauric acid and a CTAC solution are mixed, then sodium borohydride is added, and a seed solution is obtained through stirring and standing; mixing chloroauric acid, silver nitrate, hydrochloric acid and CTAB (cetyltrimethyl ammonium bromide), and sequentially adding ascorbic acid and the seed solution to obtain a growth solution; carrying out centrifugation, morphology regulation and chemical etching purification to obtain a chromogenic gold nano bipyramid solution; the preparation method comprises the following steps: reacting gelatin with methacrylic anhydride in PBS, dialyzing and freeze-drying to obtain GelMA; dissolving GelMA in the gold nanoparticle bipyramid solution, and adding a photoinitiator LAP to obtain a mixed precursor solution; and the GelMA microneedle patch loaded with the gold nano bipyramid is prepared through mold casting, centrifugation, ultraviolet light crosslinking and drying demolding. The microneedle extraction and gold nano bipyramid color development integrated scheme is initiated, blood sampling is not needed, the dermis interstitial fluid is extracted in a minimally invasive mode through the microneedle, detection pain and trauma are reduced, the cross infection risk of blood treatment is avoided, and the microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle

The invention discloses a method for rapidly determining the content of breast milk oligosaccharide in dairy products, which comprises the following steps: sampling and pretreating different types of dairy products according to sample states, carrying out ultrasonic extraction, refrigerated centrifugal degreasing and centrifugal ultrafiltration protein purification on the obtained sample, and reducing the purified sample solution by using sodium borohydride to obtain a sample solution to be detected; reducing the breast milk oligosaccharide standard substance by sodium borohydride to obtain a standard solution to be detected; determining the standard substance solution and the to-be-detected sample solution by adopting ultra-high performance liquid chromatography-tandem mass spectrometry, establishing a standard curve, and carrying out quantitative analysis on the to-be-detected sample solution; the chromatographic conditions are as follows: an ACQUITY UPLC BEH Amide hydrophilic interaction chromatographic column is adopted; the mobile phase A is 20 mmol / L ammonium formate; the mobile phase B is acetonitrile; and gradient elution.

The invention discloses a synthesis and purification method of electronic-grade diborane, and relates to the technical field of diborane synthesis, and the synthesis and purification method has the advantages that cation 1-ethyl-3-methylimidazole in ionic liquid has a relatively large volume and a specific spatial configuration; the ionic liquid can be close to reactants sodium borohydride and hydrogen through intermolecular force, meanwhile, the anion bis (trifluoromethanesulfonyl) imide salt has high polarity and can attract reactant molecules with opposite charges, so that the ionic liquid makes full contact with the reactants, sulfolane has high dissolving capacity and can well dissolve sodium borohydride and hydrogen, and the ionic liquid can be separated from the reactants. Sodium borohydride and hydrogen are uniformly distributed in a mixed solvent, the sodium borohydride and hydrogen are efficiently reacted at proper temperature and pressure to generate high-purity diborane under the synergistic effect of the sodium borohydride and the hydrogen, sufficient contact of reactants is ensured by timely stirring in the reaction process, the reaction efficiency and the diborane yield are greatly improved, and the yield of the diborane is increased. And favorable conditions are created for subsequent preparation of electronic-grade diborane.

The present invention relates to the field of biomedical materials, and in particular to a method for preparing a decellularized cartilage matrix material derived from pig rib cartilage, comprising the following steps: (1) freezing and thawing the pig rib cartilage for 5 times; (2) soaking the pig rib cartilage frozen and thawed in step (1) in a sodium borohydride solution; (3) soaking the pig rib cartilage treated with sodium borohydride in step (2) in a sodium dodecyl sulfate solution; and (4) enzymolyzing the pig rib cartilage obtained in step (3) with a mixed solution of DNase and RNase. The present invention is suitable for decellularization of cartilage tissue with a thickness of 300 microns, and utilizes the spontaneous generation of hydrogen by the sodium borohydride solution to effectively expand the cartilage tissue, and then the surfactant SDS fully destroys the cell membrane, effectively removes the genetic material, and retains the effective components or extracellular matrix of the natural cartilage to the greatest extent.

The invention discloses an nZVI-Al / biochar adsorbent as well as a preparation method and application thereof. The preparation method comprises the following steps: pyrolyzing rice straw powder in an inert atmosphere to obtain rice straw biochar; adding the mixture into an aluminum salt solution, then adding alkali liquor until the pH value of the mixed liquor is 5-10, continuously stirring for 0.5-1 hour, and carrying out post-treatment to obtain an Al / charcoal precursor material; adding the Al / charcoal precursor material into ferric salt, ethanol and water, stirring until the solid is dissolved, continuously stirring in an inert atmosphere, adding a sodium borohydride solution, and continuously stirring for 0.5-1 hour; and after the reaction is finished, centrifuging to obtain a precipitate, and washing and drying the precipitate to obtain the nZVI-Al / biochar adsorbent. The highest adsorption capacity of the prepared nZVI-Al / biochar serving as an adsorbent to oxytetracycline can reach 208.92 mg / g, excellent adsorption performance is shown, and the nZVI-Al / biochar can serve as a good adsorbent for oxytetracycline pollution control.

The preparation method comprises the following steps: (1) fish skin pretreatment: (2) gas foaming treatment: weighing sodium borohydride with a certain molar concentration, dissolving the sodium borohydride in a phosphate buffer solution with a certain concentration, stirring until bubbles in the solution are obviously generated and most of solids are dissolved, and then, carrying out gas foaming treatment; putting the cleaned fish skin tissues in the step (2), and performing foaming treatment; (3) cleaning treatment; and (4) protection and storage. The gas foaming technology is innovatively adopted for decellularization treatment, the interface stripping effect between cells and a matrix is remarkably enhanced on the premise that the collagen three-dimensional structure and the scaffold morphology integrity are not damaged, and the method is suitable for the decellularization pretreatment process of soft tissue (such as fish skin and placenta) with a compact structure or cell-intensive type. The development of a biomedical material, especially a tissue engineering scaffold technology, is promoted, and the preparation method has a wide application prospect.

The invention belongs to the field of photocatalytic preparation of hydrogen peroxide, and relates to a novel secondary amine linked covalent organic framework material (AR-COF) as well as a preparation method and application thereof. According to the material, tetraaldehyde phenyl porphyrin and 2, 5-diamino-1, 4-benzenediol dihydrochloride are subjected to a Schiff base reaction to synthesize an imine bond connected porphyrinyl covalent organic framework (IM-COF), and then synthesis post-modification (PSM) is performed on the imine bond connected porphyrinyl covalent organic framework (IM-COF) so that the imine bond connected porphyrinyl covalent organic framework (IM-COF) and sodium borohydride can be subjected to a reduction reaction to generate AR-COF. The photocatalytic stability of the material is maintained through modification after synthesis, the catalytic activity is improved, and the original crystal structure is not damaged. A photocatalytic hydrogen peroxide production experiment shows that the catalytic activity of AR-COF under 420 nm monochromatic light is superior to that of IM-COF, the yield under an oxygen condition reaches 7.79 mmol.g <-1 >. H <-1 >, and hydrogen peroxide can be stably produced. The method utilizes solar energy for green synthesis under mild conditions, and provides a safe and efficient method for hydrogen peroxide production.

The invention discloses preparation and application of a carbon-loaded PtCo ordered structure oxygen reduction electrocatalyst, and belongs to the technical field of fuel cells. The preparation method comprises the following steps: preparing a Co / C precursor by using a sodium borohydride reduction method through a step-by-step reduction method, combining Pt with Co / C by using an impregnation method, and finally preparing the carbon-loaded PtCo ordered structure oxygen reduction electrocatalyst by using a high-temperature gas reduction method. The prepared carbon-loaded PtCo ordered structure oxygen reduction electrocatalyst is small in average particle size and narrow in size distribution, is uniformly dispersed on the surface of a carbon carrier, is high in catalytic reaction activity, and can be used in the fields of fuel cells, metal-air cells and the like.

The invention discloses a preparation method of platinum-based multi-metal aerogel and application of the platinum-based multi-metal aerogel in an electro-catalysis hydrogen evolution reaction. The method comprises the following steps: firstly, sequentially adding platinum salt and other metal salts into pure water, uniformly mixing, then adding a sodium borohydride solution, uniformly mixing, quickly freezing the reaction solution with liquid nitrogen, melting to obtain wet gel, and then washing and drying the wet gel to obtain the aerogel. The obtained metal aerogel is applied to a hydrogen evolution electrocatalyst and shows excellent catalytic activity under an alkaline condition. The preparation method has the advantages that the synthesis process is simple, convenient and efficient, regulation and optimization of an electronic structure can be realized through interaction among multiple metals, so that the catalytic performance is improved, the porous structure of the aerogel effectively provides a high-speed mass transfer channel, the catalytic activity is improved, and the preparation method is suitable for industrial production. And a solid foundation is laid for wide application of the metal aerogel material in the field of industrial chemical engineering.

The invention discloses a modified microfiltration membrane for enriching biological particles and a preparation method and application thereof, and belongs to the technical field of biological separation.The preparation method of the modified microfiltration membrane comprises the following steps that a mixed cellulose ester microfiltration membrane is provided and subjected to alkali liquor activating treatment; placing the activated membrane in a weakly alkaline buffer solution for balancing; the preparation method comprises the following steps: in a weakly alkaline buffer solution, firstly contacting the surface of the membrane with a tannic acid solution to carry out a first reaction, and then directly adding a polyethyleneimine solution to carry out a second reaction under the condition of not replacing a system, so as to form a phenol-amine cross-linked network on the surface of the membrane in situ; sodium cyanoborohydride is continuously added for reduction stabilization treatment, and the modified microporous filter membrane is obtained. The modified microporous filter membrane prepared by modifying the microporous filter membrane with tannic acid and polyethyleneimine can realize one-step synchronous enrichment of all negatively charged targets, and the problems of target loss, efficiency loss and the like caused by a multi-step process are avoided from the source.

The present invention discloses a nano copper-based catalyst, its preparation method, and its application in the electrocatalytic reduction of carbon dioxide and carbon monoxide. Copper chloride (or copper nitrate, copper acetate) is dissolved in ultrapure water, and a sodium borohydride solution is added dropwise. Stir at room temperature for 5-60 min, filter, and dry to obtain a nano copper catalyst. Further, through a displacement reaction, nano copper-palladium and copper-silver catalysts are obtained. The present invention is applied to the electrocatalytic reduction of carbon monoxide. In a membrane electrode assembly (MEA) electrolyzer, the Faraday efficiency of multi-carbon products (C2+) reaches up to 95%, the partial current density reaches up to 3 A cm-2, and the overall electrolyzer energy efficiency reaches up to 39%. It can stably electrolyze for 30 hours at 1 A cm-2. This nano copper catalyst is applied to the electrocatalytic reduction of carbon dioxide. In an MEA electrolyzer, the Faraday efficiency of C2+ reaches up to 66%, and the partial current density reaches up to 331 mA cm-2.