89results about How to "Increase contact points" patented technology

The invention discloses a modified silicon monoxide material and a preparation method thereof. The modified silicon monoxide material is the modified silicon monoxide material used for a lithium battery negative electrode. The modified silicon monoxide material is prepared by the following steps: reacting raw materials silicon, silicon dioxide and metal silicate under high-temperature and vacuum conditions to prepare silicon monoxide, and reacting metal steam with silicon monoxide in the preparation process to form metal silicate in situ; wherein the metal silicate is uniformly dispersed around the silicon and the silicon monoxide to form silicon-containing particles, and the carbon material is coated on the surfaces of the silicon-containing particles. The silicate in the modified siliconmonoxide material is uniformly dispersed, the carbon material is uniformly coated, and the modified silicon monoxide material shows high specific capacity, high initial coulombic efficiency, excellent cycle performance and rate capability when used as the lithium ion battery negative electrode material. Moreover, the preparation method disclosed by the invention is low in raw material price and beneficial to industrial implementation, so that the modified silicon monoxide has a very wide application prospect.

The invention relates to the field of lithium batteries, and especially relates to a high-capacity, high-compaction and quick-charge composite graphite negative electrode material. Artificial graphiteand natural graphite single particles are tightly anchored together through amorphous carbon to form a composite graphite secondary particle structure, and a layer of amorphous carbon is applied between the artificial graphite and the natural graphite particles and on the surface of each component particle in a coating manner. The defect that a graphite negative electrode material developed in the prior art cannot give consideration to high capacity, high compaction or quick charging performance is overcome, the advantages of the natural graphite are utilized to ensure the high capacity and high compaction performance of the material, meanwhile, the natural graphite is compounded with the artificial graphite with partial isotropy to buffer the expansion of the natural graphite, and the layer of amorphous carbon is formed between the artificial graphite and the natural graphite particles and on the surface of each single particle, so that the migration rate of lithium ions between thesurface of the graphite and different graphite is increased while the surface defects of the natural graphite are improved.

The invention discloses a preparation method of an indium zinc sulfide / bismuth vanadate composite material. The preparation method comprises the following steps: (1) mixing zinc chloride, indium chloride tetrahydrate and thioacetamide with water and glycerol, and stirring until the obtained mixture is uniformly dispersed; and (2) adding decahedral bismuth vanadate into the obtained mixed solution,stirring, and preparing the indium zinc sulfide / bismuth vanadate composite material by using a low-temperature solvothermal technology. The invention also discloses the indium zinc sulfide / bismuth vanadate composite material prepared by the method, and an application of the indium zinc sulfide / bismuth vanadate composite material as a photocatalyst in the field of new energy. The indium zinc sulfide / bismuth vanadate composite material has a very good catalytic effect on hydrogen production by photolysis of water, and can be repeatedly utilized for multiple times; and the composite material hasthe advantages of simple preparation process, easiness in recycling and the like, and has a wide application prospect in the field of new energy.

The invention discloses a method for preparing a monophenol compound through catalyzing degradation of lignin by using an ammino-complex. The method comprises the steps: adding the lignin, a metal salt, ammonia water, a peroxidant, an alkali and deionized water into a high-pressure reaction vessel, and carrying out stirring to form a uniform solution; carrying out a reaction for 100 to 240 minutes at the temperature of 120 DEG C to 180 DEG C, and carrying out cooling; and adjusting the pH value of a reaction solution to 2 to 3 with an acid, then, carrying out a reaction for 10 to 20 minutes at the temperature of 100 DEG C to 120 DEG C, carrying out cooling, then, carrying out filtration to collect filtrate, carrying out extraction on the filtrate with dichloromethane, separating an organic phase, and carrying out drying with anhydrous calcium chloride, thereby obtaining a monophenol compound mixed solution. According to the method, a stable ammino-complex solution is formed by using the metal salt and the ammonia water under alkaline conditions, so that the number of sites of contact between a catalyst and the lignin can be effectively increased compared with that in the conventional lignin oxidative degradation method; the degradation of the lignin can be efficiently catalyzed in an aqueous solution under moderate reaction conditions; and the method has the characteristics of high efficiency and low cost and is applicable to large-scale industrial production.

The invention provides a molybdenum disulfide / indium hydroxide composite air-sensitive sensing material as well as a preparation method and application thereof. According to the molybdenum disulfide / indium hydroxide composite air-sensitive sensing material, the problems that an existing sensitive material for detecting NOx is high in working temperature requirement, low in sensitivity, poor in selectivity and long in recovery time are solved. The composite air-sensitive sensing material is prepared from MoS2 and indium salt. The preparation method comprises the following steps: (1) weighing the raw materials; (2) dissolving the weighed raw materials, so as to obtain mixed liquid; (3) carrying out hydrothermal reaction on the mixed liquid; (4) washing solid products; (5) preparing MoS2 suspension liquid; (6) preparing reaction liquid; (7) carrying out hydrothermal synthesis reaction on the reaction liquid; and (8) sequentially washing and drying solid products. The composite air-sensitive sensing material used as a sensitive material for preparing air-sensitive elements. The composite air-sensitive sensing material is high in sensitivity, outstanding in selectivity and low in cost. The composite air-sensitive sensing material is suitable for being applied to the preparation of air-sensitive sensing materials and air-sensitive elements.

The invention discloses a method for extracting rice bran oil through a three-phase separation aqueous enzymatic method. By adopting a near infrared heating technology for stabilizing fresh rice brans, partial lipase and lipoxidase in rice bran are damaged, so that rice bran proteins cannot be excessively denatured; then through supercritical CO2 wall-breaking treatment, the residual activity of the lipoxidase and the like in the rice bran is further reduced, and meanwhile, a remarkable breaking effect on rice bran cell walls is achieved; contact sites with a complex enzyme are increased during an enzymolysis technology step, and interval type high-pressure pulse treatment is simultaneously carried out during an enzymolysis process, so that the effect of carrying out enzymolysis and demulsification simultaneously is achieved, the grease release and the oil drop gathering are facilitated, the dissolving of grease is accelerated, and the oil yield is improved; then through three-phase method separation, the grease and proteins are separated and extracted.

The invention discloses a solar energy charging pile. The solar energy charging pile comprises a vehicle shed provided with solar energy battery plates and a charging pile body. The vehicle shed comprises a sunshade shed body of a concertina foldable structure and a vehicle shed support, the solar energy battery plates are installed on the upper surface of each folding sheet of the sunshade shed body, the vehicle shed support comprises a front sliding rod and a rear sliding rod which are transversely installed in parallel, the right side end of the sunshade shed body is fixedly connected to the front sliding rod and the rear sliding rod through a connecting plate A, connecting rings are installed at the front and rear edges of the upper folding edge between the two folding sheets of the sunshade shed body, connecting rings are further installed at the front and rear edges of right side end of the sunshade shed body, the connecting rings installed on the front side of the sunshade shedbody sleeve the front sliding rod, the connecting rings installed on the rear side of the sunshade shed body sleeve the rear sliding rod, and the connecting rods can slide on the front sliding rod orthe rear sliding rod. The solar energy charging pile can flexibly adjust the angle of the solar energy battery plate according to the sunlight direction, improve absorption and conversion efficiency of the solar energy, and enhance power supply ability.

The invention discloses an air electrode, a preparation method of the air electrode and an electrochemical-chargeable zinc-air battery comprising the air electrode. The air electrode increases the contact site density of three-phase reaction of oxygen, an alkaline electrolyte and a solid catalyst in an electrode reaction area, provides a charge transfer reaction network for the oxidation reaction and reduction reaction of oxygen in the whole electrode three-dimensional space, and reduces charge transfer resistance, so that the energy density, power density and capacitive properties of the battery are improved, and the degree of polarization of the charging and discharging process is greatly reduced. The preparation process of the air electrode is simple, a high-temperature calcination and hot-pressing molding process technology is adopted, mass production is facilitated; the prices of used raw materials are low, and the preparation process is environmentally-friendly. The air electrode and the battery comprising the air electrode are economical and practical, have good performance and have important application prospects.

The invention belongs to the technical field of energy storage materials and particularly relates to preparation and application of a nickel-based three-dimensional graphene / manganese dioxide composite material. The preparation method includes steps that foamed nickel serves as a template, an organic carbon source serves as a raw material, graphene grows on the foamed nickel in situ through a chemical vapor deposition method, and nickel-based three-dimensional intercommunicated network structure graphene is prepared; nickel-based three-dimensional intercommunicated network structure graphene is taken as a conductive substrate, in-situ growth of manganese dioxide on a surface of the conductive substrate is performed by utilizing a hydrothermal reaction method to prepare a nickel-based three-dimensional intercommunicated network structure graphene / manganese dioxide composite material in a wet state, washing with the water is performed to be neutral, and freeze drying is performed to obtain the nickel-based three-dimensional intercommunicated network structure graphene / manganese dioxide composite material. The nickel-based three-dimensional graphene / manganese dioxide composite material is used as a working electrode of a supercapacitor.

The invention discloses a purification method of heavy metal contaminated soil, which comprises the following steps: (1) crushing biochar and bentonite respectively, and then mixing with surfactant, composite bacterium agent and heavy metal collector to obtain heavy metal repairing material; (2) turning that contaminated soil deeply, paving a layer of repairing material into the contaminated soil,covering the soil and paving a layer of repairing material into the contaminated soil; (3) detecting the content of heavy metals in soil regularly; (4) recovering that remediation material from the soil after the heavy metal content in the soil is reduced to be stable. The invention is beneficial to the construction of a heavy metal adsorption-chelation fixed soil environment, greatly reduces therisk of secondary pollution of heavy metals, has the advantages of high purification efficiency, cheap raw materials and simple and concise methods, and is suitable for the remediation and purification of various heavy metal-contaminated soils.

The invention relates to large-aperture one-dimensional tubular zeolite and a preparation method thereof. The large-aperture one-dimensional tubular zeolite has a nanometer one-dimensional hollow tube structure, the internal diameter of the large-aperture one-dimensional tubular zeolite is 70-90nm, the tube wall thickness is 15-22nm, and the tube length is 0.65-1 micron. The preparation method of the large-aperture one-dimensional tubular zeolite comprises the following steps: 1) preparing purified halloysite; and 2) preparing the large-aperture one-dimensional tubular zeolite: under the conditions of normal temperature and normal pressure, grinding the purified halloysite until the particle size is less than or equal to 200mesh, adding the ground purified halloysite into a sodium hydroxide solution, uniformly mixing, putting in a hydrothermal reaction kettle, carrying out hydrothermal reaction for 20-24h under the condition with the temperature to be 100-110 DEG C, and then carrying out post-processing to obtain the large-aperture one-dimensional tubular zeolite. The method is simple in step, mild in reaction condition, short in production period, simple in procedure, low in cost and little in secondary pollution and is suitable for scale production.

The invention discloses an MoS2 / schwertmannite Fenton composite catalyst, and a preparation method and application thereof, and belongs to the field of water treatment. The structure of the compositecatalyst is as follows: MoS2 with a lamellar structure is distributed on the surface of sphere-shaped schwertmannite. In an X-ray diffraction (XRD) pattern of the catalyst, characteristic diffractionpeaks of schwertmannite exist at positions of 26.26 degrees, 35.16 degrees, 46.53 degrees and 61.34 degrees, and characteristic diffraction peaks of MoS2 exist at positions of 14.38 degrees, 32.67 degrees, 35.87 degrees, 39.53 degrees, 49.79 degrees, 58.33 degrees and 72.79 degrees. The composite catalyst can accelerate circulation of Fe<3+> / Fe<2+> in a Fenton-like oxidation reaction under illumination and light-shielding states, and oxidation reaction efficiency is promoted. The invention further provides the preparation method of the catalyst and application of the catalyst in the field of wastewater treatment.

The invention provides an extraction method of fish skin active polypeptide and belongs to the field of polypeptide extraction. The extraction method comprises the following steps: carrying out degreasing treatment, removing hybrid protein, extracting polypeptide and purifying anti-oxidization collagen polypeptide, wherein the method for removing the hybrid protein comprises the following steps: putting fish skin subjected to the degreasing treatment into 0.05 to 0.2 M NaOH and continuously stirring at a low speed; carrying out impurity removal at 5 to 20 DEG C for 12 to 24 h; washing with water until the fish skin is neutral; putting the fish skin into 2 to 3.5 percent NaCl and carrying out salt precipitation for 12 to 24 h; dialyzing with distilled water; taking sediment and freezing anddrying to obtain fish skin collagen powder, wherein 1,2-diphenyl ethylenediamine and semicarbazide are dissolved in the NaOH solution. The fish skin active polypeptide with high purity, low molecularweight and strong anti-oxidization capability is obtained through extraction; the extraction method is simple, environmentally friendly and efficient; the extracted fish skin active polypeptide has low molecular weight, is easy to absorb and has relatively strong anti-oxidization activity, so that the fish skin active polypeptide can be applied to preparation of an anti-oxidization substance in cosmetics, foods and medicines.

The invention discloses a composite catalyst of MoS2 / defective MIL-100 (Fe) and a preparation method and application thereof. According to the composite catalys, MIL-100 (Fe) grows on MOS2 in situ toobtain a MoS2 / MIL-100 (Fe) material, the MoS2 / MIL-100 (Fe) material is activated at a high temperature to obtain the composite catalyst, the composite catalyst is formed by bonding MOS2 and MIL-100 (Fe), and the mass ratio of MOS2 to MIL-100 (Fe) is 0.2-0.8: 1. According to the composite catalyst, the reduction effect of Mo < 4 + > is utilized; meanwhile, the iron-based active component exposed bythe defective MIL-100 (FE) is utilized, good physicochemical properties of MoS2 and the defect type MIL-100 (Fe) are considered at the same time; a favorable way is provided for diffusion of pollutant molecules and H2O2 molecules in a Fenton-like system; the defect that the promotion effect of MoS2 composite catalysts on Fenton-like compounds in the prior art needs to depend on light conditions is overcome, the oxidation reaction promotion efficiency is improved, the pH application range is wide, and good catalytic degradation performance is still kept under the neutral pH condition.

The invention discloses an application of a house rubbish compound bactericide in the aspect of improving the mineral nutrition requirement in a lawn plant body. Three strains namely, bacillus subtilis, actinomycete and saccharomycete are diluted by 100-200 times so as to form the compound bactericide, wherein the volume ratio of bacillus subtilis to actinomycete to saccharomycete is 1: 1: 1. After the compost compound microorganism bactericide is sprayed, the variation tendencies of a large amount of elements (Na, K, Ca and Mg) are the same basically along with the increase of dilution multiple of the bactericide, and the influences of the compost compound microorganism bactericide on lawn plant growth due to host plant varieties and environment factors are obviously different, which is beneficial to absorption and utilization of the lawn plants on mineral elements.

The invention belongs to the technical field of optical cables, in particular to an optical cable capable of dissipating heat easily. The optical cable comprises a first fire-proof layer, a polyethylene sheath, a second fire-proof layer, a water-blocking belt, a reinforced steel pipe, optical cable paste, loose sleeves, heat conduction pads, optical fiber paste, optical fibers, bolts, a first connecting plate, a bottom plate, a top plate, second connecting plates and through holes. Accordingly, heat generated in the optical fibers is transmitted to the exteriors of the optical fibers by additionally arranging the heat conduction pads outside the optical fibers; the phenomenon that the cable is ignited in case of fire, and data transmission is interrupted is avoided under cooperation of thefirst fire-proof layer, the second fire-proof layer and the reinforced steel pipe; when multiple optical cables are installed side by side, one cable is clamped in a circular groove between the bottom plate and the top plate, the top plate is fixed to the upper surface of the bottom plate through the bolts, and by means of cooperation of the first connecting plate and the second connecting plates, multiple connecting structures are connected in series, and then the purpose that multiple optical cables are balanced through mutual force is achieved.

The invention provides a preparation method of whole egg powder with high gelation and high gel stability. The preparation method comprises the following steps of: mixing monosaccharide with polysaccharide according to a certain ratio; adding according to the specific amount; reacting at the condition with a certain temperature, humidity and time; carrying out pasteurization; and spraying and drying to obtain the gel type whole egg powder with high gelation and high gel stability. The preparation method is simple in process and easy to operate, and greatly reduces the time for modification reaction, wherein 30 to 60 minutes are reduced; the gel has the strength up to 350 to 450g / cm<2>, the common whole egg powder has the gel strength of about 220g / cm<2>; and the gel strength of the modified whole egg powder is still more than 300g / cm<2> after storing for three months. The preparation method is suitable for the practical industrial production and provides the theoretical foundation for producing and processing special whole egg powder.

The invention discloses a preparation method of a high-activity catalyst used for catalyzing isomerization of glucose. The preparation method specifically comprises the steps that magnesium salt, niobium hydroxide and other active centers are evenly dispersed in a high-amylose hydrogel containing urea and thiourea, after freeze drying, high-temperature roasting is carried out under the inert gas atmosphere, and the MgO / Nb2O5 catalyst taking N and S doped activated carbon as a carrier is obtained. The catalyst can be uniformly dispersed in a solvent system, reduces the aggregation among the active centers, and can efficiently catalyze the glucose isomerization into fructose under the mild conditions. The provided catalyst has the advantages that the preparation process is simple, the catalytic efficiency is high, and reliable technical support is provided for the industrialized popularization of the high value-added fructose prepared by the glucose isomerization.

The invention discloses a preparation method of a catalyst for visible light-ozone synergistic catalysis and the catalyst prepared by the preparation method. The preparation method of the catalyst comprises the following steps of: preparing an active component ZnO-g-C3N4 and preparing the reduced graphene hybrid ZnO-g-C3N4 aerogel. By forming a Z-type heterojunction powder catalyst material ZnO-g-C3N4 from g-C3N4 and ZnO and loading the powder catalyst material ZnO-g-C3N4 onto a graphene gel framework with a three-dimensional structure, the obtained reduced graphene hybrid ZnO-g-C3N4 aerogel catalyst has excellent degradation efficiency on organic pollutants under visible light-ozone synergistic catalysis, and meanwhile, rapid and efficient separation and recovery of the catalyst are realized, so that the prepared catalyst has excellent cycling stability activity.

Ultrafine nitrogen-doped molybdenum carbide nanoparticle loaded on three-dimensional nitrogen-doped flower-shaped carbon spheres, as well as a preparation method and application thereof are disclosed.According to a technical scheme, the method mainly comprises (1) dissolving a surfactant and flower-shaped carbon spheres into water, carrying out ultrasonic dispersion, adding molybdate into the mixture, and carrying out ultrasonic dispersion until the molybdate is dissolved; and (2) transferring the mixed solution obtained in the step (1) into a reaction kettle, carrying out a hydrothermal reaction, then carrying out suction filtration, washing and drying, and carrying out high-temperature annealing treatment in an inert gas atmosphere to obtain the ultrafine nitrogen-doped molybdenum carbide nanoparticle loaded on three-dimensional nitrogen-doped flower-shaped carbon spheres. The design structure has ultrafine nanoparticles and a three-dimensional nitrogen-doped flower-like carbon skeleton, and nitrogen is doped into molybdenum carbide and the carbon skeleton at the same time, so that catalytic site exposure, rapid mass transfer and optimization of an electronic structure are facilitated, and the catalytic hydrogen evolution performance of the electrocatalyst is effectively improved.

The invention discloses a Cu-high-entropy alloy thin film and a preparation method thereof. The Cu-high-entropy alloy thin film comprises the chemical component Cu-TaNbHfZr, wherein the atomic percent of the Cu-TaNbHfZr is as follows: copper is not less than 94.4, and the other element is a tantalum-niobium-hafnium-zirconium high-entropy alloy; the atomic percent of tantalum to niobium to hafnium to zirconium in the tantalum-niobium-hafnium-zirconium high-entropy alloy is 1: 1: 1: 1; a microstructure is complete nanocrystalline, and the grain size is 35.4 + / -2nm; the percentage of crystal grains containing nano-twin crystals is not lower than 90%, the thickness of the twin crystal lamellae is 2.4-3.5 nm, the advantages of the magnetron sputtering technology are utilized, the temperature in the deposition process is low, nanocrystal and nano-twin crystal structures can be formed easily, and alloy elements are macroscopically and evenly distributed through co-sputtering of different target materials, so that the multi-component alloying Cu thin film is obtained and is compact and well bonded with a matrix; the grain size is stabilized in the nano-crystal range, and a large number of nano-twin crystals are embedded in the grains; the alloy composition and components can be regulated and controlled; and the strength is high and the high thermal stability is good.

The invention discloses a preparation method of conductive silver paste applied to a ceramic filter. The method comprises the following steps: adding potassium halide, aluminum sulfate, polyvinylpyrrolidone and silver nitrate into ethylene glycol, and reacting to generate nano-silver rods; preparing a first dispersion liquid which is an ethanol dispersion liquid or a mixed dispersion liquid of nano-silver rods, a high-boiling-point organic solvent is added, ethanol is distilled under reduced pressure, then lead-free glass powder and a thickening agent are added, and the conductive silver pasteis obtained. According to the invention, the conductive silver paste is prepared by using the nano silver rods with small diameter and large length-diameter ratio and a nano silver sheet with small particle size to replace micron-sized silver powder with large particle size, so that the adhesive force and conductivity of the conductive silver paste are increased, the sintering temperature is reduced, the finally formed conductive layer is more compact, and the resistance of the conductive layer is favorably reduced; the conductive silver paste provided by the invention does not contain lead,is lower in sintering temperature, smaller in resistance and higher in adhesive force, and has the advantages of environmental protection and low cost.

The invention provides a negative pole piece, a preparation method thereof and a lithium ion secondary battery comprising the negative pole piece. A negative active material layer in the negative polepiece comprises a negative active material, a first conductive agent, a first binder, a first thickener and gel particles, wherein the gel particles have a certain swelling property and a good electrolyte adsorption effect, and meanwhile, the conductive agent contained in the gel particles can ensure a conductive network in the negative pole piece and ensure ion conductivity and electron conductivity among the particles in the negative active material layer. The negative pole piece can solve the problem of low electrolyte retention capacity of the pole piece under high compaction density, andis beneficial to improving the long cycle performance of the battery. The negative pole piece provided by the invention can improve the electrolyte retention amount of the negative pole piece under high compaction density and improve the cycle performance of the battery.

The invention discloses a preparation method of a nano carbon material composite resin hard carbon electrode material. The preparation method comprises the steps of preparing a phenolic aldehyde mixed solution; adding a dispersed aqueous solution of a nano carbon material into the phenolic aldehyde mixed solution to obtain a uniformly dispersed mixed solution; then adding an alkaline substance catalyst to obtain a reaction solution; heating the reaction solution at constant temperature in vacuum to obtain composite phenolic resin hydrogel; performing freeze drying on the composite phenolic resin hydrogel to obtain composite phenolic resin aerogel; crushing the composite phenolic resin aerogel, and carbonizing at low temperature to obtain composite resin carbon aerogel; performing high-temperature treatment on the composite resin carbon aerogel to obtain a composite resin hard carbon material; and uniformly mixing the composite resin hard carbon material, PTFE and ethanol to obtain the nano carbon material composite resin hard carbon electrode material. According to the invention, the phenolic resin source hard carbon is used as an active material main body, the production cost is low, and an aqueous reaction system is adopted, so that the method is environment-friendly and pollution-free.

The invention belongs to the field of magnetic composite photocatalytic materials, and in particular relates to a ZnFe2O4 / Bi7O9I3 magnetic composite photocatalytic material and a preparation method thereof. The preparation method comprises the following steps of: firstly, inserting ZnFe2O4 magnetic nanoparticles into a micron-sized flower-like structure formed by Bi7O9I3 nanosheets to form a composite structure in which particles are inserted into micron flowers; wherein the size of the ZnFe2O4 nanoparticles is 20-80nm, the thickness of the Bi7O9I3 nanosheet forming the Bi7O9I3 micron flowersis 5-10nm; ZnFe2O4 and Bi7O9I3 are compounded according to a mass ratio of 1:(2-6), the formed magnetic composite photocatalytic material shows superparamagnetism, is high in saturation magnetizationintensity, strong in photocatalytic activity and strong in magnetic separability, has good visible light degradation capability on a target pollutant bisphenol A, and can be quickly recycled through an external magnetic field to achieve the purpose of recycling for multiple times; and the preparation method of the magnetic composite photocatalytic material is reliable in principle, simple, easy tocontrol, green, safe, free of high-temperature calcination, conventional in equipment and low in cost, and has the industrial prospect of large-scale production.

The invention discloses a preparation method of a high-performance Alk-Ti3C2 / PDMS flexible piezoresistive sensor. The method comprises the following steps of: preparing a PDMS flexible film with a structured flexible substrate, synthesizing a conductive material two-dimensional MXene sheet (Ti3C2Tx) and a 3D wrinkle-shaped Alk-Ti3C2, then preparing an Alk-Ti3C2 / PDMS conductive film, and finally, assembling the Alk-Ti3C2 / PDMS conductive film and a flexible interdigital electrode together through glue to obtain the flexible piezoresistive sensor. According to the invention, an abrasive cloth isused as a template, so that the structured PDMS film is effectively obtained, and the pressure range of the sensor is widened; according to the invention, NaOH is utilized to optimize the structure ofthe two-dimensional material Ti3C2Tx, so that the stacking phenomenon of the material is effectively prevented, a unique wrinkle-shaped structure is obtained, and the sensitivity of the sensor is improved; the preparation method provided by the invention is simple, feasible and easy to operate, and the application field of the Ti3AlC2 ceramic material nano material is widened.

The invention belongs to the field of nanometer material catalysis, and particularly discloses a method for preparing nanometer spherical carbon-based solid acid by taking lignin as a raw material. The method comprises the following steps: dissolving the modified or unmodified lignin in an organic solvent, and adding water, so that the lignin is self-assembled to obtain lignin nano colloidal spheres; drying the lignin nano colloidal spheres, then dispersing the dried lignin nano colloidal spheres into a certain volume of water, filling a polytetrafluoroethylene tank with the mixture, carryingout hydrothermal carbonization, and carrying out suction filtration, washing and drying on the carbonized product; and putting the dried lignin nano carbon spheres and a certain volume of concentratedsulfuric acid into a polytetrafluoroethylene tank for sulfonation, and carrying out suction filtration, washing and drying on the sulfonated product to obtain the lignin nano spherical carbon-based solid acid. The carbon-based solid acid can replace sulfuric acid for application in an acid catalytic reaction, and has the advantages of being green, regenerable and low in corrosion to equipment andthe like.

The invention discloses a method for preparing a monophenol compound through catalyzing degradation of lignin by using an ammino-complex. The method comprises the steps: adding the lignin, a metal salt, ammonia water, a peroxidant, an alkali and deionized water into a high-pressure reaction vessel, and carrying out stirring to form a uniform solution; carrying out a reaction for 100 to 240 minutes at the temperature of 120 DEG C to 180 DEG C, and carrying out cooling; and adjusting the pH value of a reaction solution to 2 to 3 with an acid, then, carrying out a reaction for 10 to 20 minutes at the temperature of 100 DEG C to 120 DEG C, carrying out cooling, then, carrying out filtration to collect filtrate, carrying out extraction on the filtrate with dichloromethane, separating an organic phase, and carrying out drying with anhydrous calcium chloride, thereby obtaining a monophenol compound mixed solution. According to the method, a stable ammino-complex solution is formed by using the metal salt and the ammonia water under alkaline conditions, so that the number of sites of contact between a catalyst and the lignin can be effectively increased compared with that in the conventional lignin oxidative degradation method; the degradation of the lignin can be efficiently catalyzed in an aqueous solution under moderate reaction conditions; and the method has the characteristics of high efficiency and low cost and is applicable to large-scale industrial production.

The invention discloses a polypeptide mixture with oxidation resistance and DPP-IV (Dipeptidyl Peptidase IV) inhibitory activity. The amino acid sequences of the polypeptide mixture comprise HLVDEPQNLIK, DDQNPHSSN and DDEVDVDGTVEEDLGK. The polypeptide mixture is derived from whey protein. The preparation method of the polypeptide mixture comprises the following steps: step 1, carrying out ultrahigh-pressure treatment on a whey protein isolate solution with the concentration of 1% to obtain an ultrahigh-pressure whey protein isolate solution; step 2, adjusting the pH value of the ultrahigh-pressure whey protein isolate solution in the step 1 to 2.0-3.0, adding pepsase and acid protease, carrying out heating hydrolysis and enzyme deactivation, carrying out centrifugation to obtain a supernatant, and carrying out freeze drying after rotary evaporation to obtain a polypeptide mixture crude product; and step 3, adjusting the concentration of the polypeptide mixture crude product to 1mg / mL, and separating and purifying the polypeptide mixture crude product by adopting gel filtration chromatography and RP-HPLC. The polypeptide mixture disclosed by the invention is high in oxidation resistance and DPP-IV inhibitory activity, simple in preparation process, easy to operate, environment-friendly and pollution-free.

The invention belongs to the field of waste water treatment, and particularly relates to a carbon material supported palladium catalyst, as well as a preparation method and application thereof. The preparation method comprises the steps of mixing a biomass material and a palladium salt solution, adjusting pH to be alkaline, and carrying out hydrothermal reaction after mixing so as to obtain a hydrothermal reaction product; then carrying out solid-liquid separation on the hydrothermal reaction product to obtain a solid phase, drying the solid phase, and carrying out heat treatment to obtain a carbon-supported palladium catalyst; correspondingly obtaining the carbon material supported palladium catalyst with large specific surface area, high contact efficiency and high reaction activity, sothat the technical problems of higher palladium catalyst cost, less reaction sites, low oxidant contact efficiency, low reaction efficiency, difficulty in reusing the catalyst and the like in an existing advanced oxidation technology are solved.