76results about How to "Increased degradation rate" patented technology

The invention discloses a CoFeCuMn LDH nanosheet, a confinement catalytic membrane and a preparation method of the CoFeCuMn LDH nanosheet. The preparation method of the CoFeCuMn LDH nanosheet comprises the steps that A1, cobalt salt, ferric salt, copper salt and manganese salt are dissolved in pure water according to a preset proportion to prepare a first solution, sodium hydroxide is dissolved in pure water to prepare a second solution, and sodium carbonate is dissolved in pure water to prepare a third solution; a2, adding the first solution and the second solution into the third solution, and stirring to obtain a mixed solution; a3, carrying out hydrothermal reaction on the mixed solution; a4, centrifugally washing the product obtained in the step A3 to obtain a precipitate; and A5, the sediment is dried, and the CoFeCuMn LDH nanosheet is obtained. According to the CoFeCuMn LDH nanosheet, the confinement catalytic membrane and the preparation methods of the CoFeCuMn LDH nanosheet and the confinement catalytic membrane, the degradation efficiency and the degradation rate of new pollutants are remarkably improved.

The invention relates to the field of environmental remediation, and discloses a remediation method for high-concentration organic pollutants in soil, which comprises the following steps: firstly, injecting a nano zero-valent iron (nZVI) suspension into the contaminated soil for chemical reduction treatment, then adding sodium persulfate for oxidation treatment, and then adding a nano zero-valent iron (nZVI) suspension into the contaminated soil; the complex organic pollutants are converted into biodegradable intermediate products; then, two-stage microbial communities are introduced in sequence, the first-stage microbial community is used for degrading alcohol and ketone intermediate products, the second-stage microbial community is used for degrading organic acid intermediate products, and thorough mineralization of pollutants is achieved. According to the method, the pollutant degradation rate and the final removal effect can be remarkably improved, and the method is suitable for treatment scenes of various high-concentration organic pollutants and has high adaptability and economic benefits.

The invention belongs to the technical field of friction catalysis, and particularly relates to application of an aluminum oxide substrate in friction catalytic degradation of high-concentration organic dye wastewater, an aluminum oxide ceramic chip is used as a substrate, titanium dioxide nano powder is used as a catalyst, and the aluminum oxide ceramic chip is fixed at the bottom of a flat-bottom glass beaker; the method comprises the following steps: adding organic dye wastewater, a magnetic turntable and titanium dioxide nano powder into a flat-bottomed glass beaker, then putting the flat-bottomed glass beaker in a dark environment at room temperature, stirring and reacting on a magnetic stirrer for 90-150 minutes, and after the reaction is completed, completely degrading organic dye in the wastewater. According to the method, the aluminum oxide ceramic chip is added into a system for performing friction catalytic degradation on the organic dye wastewater by using the titanium dioxide nano powder as the substrate, so that the degradation rate of the organic dye is greatly improved, the complete degradation time of the organic dye is shortened, and a new thought is provided for performing friction catalytic degradation on the organic dye wastewater by using the titanium dioxide nano powder.

The invention relates to the technical field of advertisement display, decorative materials and environment-friendly materials, in particular to a degradable advertisement inkjet film and a preparation method thereof.The degradable advertisement inkjet film comprises a glittering ink absorption layer, a degradation starting layer and a main body layer arranged between the glittering ink absorption layer and the degradation starting layer; 1%-2% of an ultraviolet light absorber; and the like. According to the degradable advertisement jet drawing film, by means of the three-layer structural design, the perfect combination of the advertisement effect and environment-friendly degradation is achieved, the flash ink absorption layer provides the unique visual effect, meanwhile, the graphene nanosheet modified titanium oxide photocatalytic layer can catalyze the degradation process under illumination, the main body layer guarantees the mechanical and printing performance of the film, and the degradable advertisement jet drawing film has the good application prospect. And the degradation starting layer realizes rapid degradation through a microbial enzyme complex, and particularly, the graphene nanosheet modified titanium oxide photocatalytic layer is used as a key technology, so that the degradation rate of the advertisement film is remarkably improved.

The invention provides a probiotic composition for promoting ethanol metabolism as well as a probiotic agent and application thereof, and belongs to the technical field of biological medicines. The preparation method comprises the following steps: compounding lactobacillus mucus A21252, plant lactobacillus A21352, casei paracasei A21151 and lactobacillus reuteri A21325 to obtain a probiotic composition, and matching the probiotic composition with auxiliary materials (resistant dextrin, xylooligosaccharide, erythritol, L-arabinose, lemon fruit powder and corn oligopeptide powder) to obtain the probiotic agent. The probiotic agent not only can quickly improve the hangover alleviating speed, has the effects of alleviating hangover, protecting liver and eliminating gastrointestinal dysfunction caused by alcoholism, but also can reduce discomfort caused by excessive drinking. The probiotic agent is simple and convenient to process, low in cost and wide in market prospect.

The invention provides degradation liquid for degrading an unsaturated polyester type wind turbine blade and a degradation and recovery method, and belongs to the technical field of thermosetting resin degradation and resource utilization. The degradation liquid comprises a polar solvent, an alcohol solvent and organic alkali; wherein the mass of the alcohol solvent accounts for 1%-40% of the total mass of the polar solvent and the alcohol solvent, and the mass of the organic base accounts for 0.5%-15% of the total mass of the polar solvent and the alcohol solvent. The polar solvent, the alcohol solvent and the organic base are mixed to form the degradation liquid, the polar solvent, the alcohol solvent and the organic base cooperate with one another, the degradation rate is greatly increased, the organic base serves as a catalyst, corrosivity is low, equipment cannot be damaged, the dosage is small, the degradation liquid can be recycled, various macromolecular substances can be recycled, the degradation process is relatively mild, and the degradation efficiency is high. The performance of the recycled fibers cannot be damaged.

The invention discloses a method for degrading organic pollutants in a water body by using modified goethite reinforced ferrate, the method comprises the following steps: adding modified goethite into a degradation system constructed by ferrate to degrade the organic pollutants in the water body, and the modified goethite is prepared by calcining metal-doped goethite as a raw material. The doped metal in the metal-doped goethite is cobalt and / or copper. According to the method, the ferrate is activated by the modified goethite with rich oxygen vacancies and surface activity Fe (II) sites, so that the ferrate can be promoted to quickly generate a large number of strong-activity species, a catalytic degradation system taking high-valence metal as a main component is constructed, and organic pollutants can be efficiently degraded under the condition that the dosage of the ferrate is less; the method can realize efficient removal of various organic pollutants in water, has the advantages of strong degradation selectivity, high degradation efficiency, good removal effect, less catalyst and oxidant dosage, no secondary pollution and the like, and has high use value and good application prospect.

The invention discloses a degradable packaging material and a preparation method thereof, and relates to the technical field of packaging materials. When the degradable packaging material is prepared, firstly, hydroxyl-terminated polylactic acid reacts with 3-chloropropionyl chloride, then reacts with 1, 2-bis (vinyl phosphine) ethane, and finally reacts with 4-mercaptophenylboronic acid to prepare modified polylactic acid; secondly, enabling the halloysite nanotube pretreated by trimethoxy (2-phenethyl) silane to react with 3, 4-dihydroxy benzoic acid, so as to obtain a modified halloysite nanotube; finally, mixing and hot-rolling the modified polylactic acid, the modified halloysite nanotube and cellulose to obtain the degradable packaging material. The degradable packaging material prepared by the preparation method disclosed by the invention has excellent degradability, antibacterial property and flame retardance.

The invention provides a method for improving the quality of fermented cigar tobacco leaves through a composite biological enzyme preparation, and relates to the technical field of tobacco production. According to the method, the accumulation of polyphenol metabolites in the cigar tobacco leaf fermentation process is promoted through common auxiliary fermentation of the fiveleaf gynostemma herb extracting solution, cellulase and neutral protease, so that chemical components in the tobacco leaf fermentation process are more coordinated, and the chemical quality and aroma quality of the fermented tobacco leaves are improved.

The invention belongs to the technical field of water treatment, and relates to a method for removing new pollutants in water by using a far ultraviolet assisted sodium hypochlorite system. The method comprises the following steps: S1, adjusting the pH value of a to-be-treated aqueous solution containing new pollutants to 4-10; s2, adding a sodium hypochlorite oxidizing agent into the aqueous solution to be treated and continuously stirring; and S3, carrying out a reaction under the ultraviolet wavelength of 200 to 230 nm. Compared with the prior art, the method has the advantages that the far ultraviolet light source and the sodium hypochlorite are jointly applied, so that the oxidation capacity of the sodium hypochlorite is improved, meanwhile, the high-energy characteristic of far ultraviolet light is fully played, efficient photocatalytic degradation of new pollutants difficult to degrade is realized, and the overall water treatment efficiency is remarkably improved.

The invention belongs to the technical field of biological filters, and relates to an anaerobic denitrification reactor and a method for accelerating degradation of nitrate nitrogen in micro-polluted water, and the reactor mainly comprises a biological filter, a water inlet tank, a peristaltic pump and a water outlet tank. The biological filter is composed of a filler composed of a modified polyvinylidene fluoride hollow fiber membrane and a high-temperature treatment iron wire, and the wastewater treatment process of the biological filter comprises a biofilm culturing stage and a domestication stage. In the biofilm culturing stage, the activated sludge enters the biofilter along with inlet water, and is loaded on the surface of membrane filaments to form a layer of biofilm; in the domestication stage, the wastewater slowly enters a biological filter and stays in a reactor, iron and nitrate nitrogen in the wastewater are subjected to denitrification reaction under the action of denitrifying bacteria, and the purpose of rapidly removing the nitrate nitrogen is achieved. According to the method, nitrate nitrogen in the wastewater can be rapidly reduced under the condition of not additionally adding a carbon source, so that the treatment process is low-carbon, aeration is not needed, energy is saved, and the method is suitable for industrial popularization.

The invention provides a wastewater treatment method. The wastewater treatment method comprises the following steps: S1, acidifying wastewater, and mixing the acidified wastewater with activated carbon and persulfate for reaction to obtain acidified wastewater; and S2, inserting a cathode plate and an anode plate into the acidified wastewater, and then carrying out electrocatalytic reaction. According to the wastewater treatment method provided by the invention, organic pollutants in wastewater are degraded by coupling three-dimensional electrocatalytic oxidation with persulfate activation until the wastewater reaches the standard and is discharged.

The invention discloses a nano zero-valent iron loaded modified sulfonic acid-based biochar catalyst and a preparation method and application thereof, and belongs to the technical field of sewage treatment. The surface of the prepared biochar catalyst contains an active sulfonic acid group and a tert-butyl phenyl group; the catalyst prepared by the method provided by the invention has abundant hydrogenation hydrolysis sites, and the surface of the catalyst contains a tert-butylbenzene hydrophobic group, so that the limiting effect of byproduct water on the reaction is effectively reduced, the catalytic efficiency is improved, and the ring opening of a furan ring is promoted; according to the catalyst prepared by the method disclosed by the invention, the nano zero-valent iron is fully dispersed on the surface layer of the carrier, so that the agglomeration phenomenon of the nano zero-valent iron is effectively avoided, the reducing capacity of the nano zero-valent iron is fully exerted, and the degradation of halogenated furan ring substances is promoted.

The invention relates to the technical field of composite biological coatings. Specifically, the invention relates to a hydrophobic composite layer on a medical degradable magnesium alloy matrix and a preparation method of the hydrophobic composite layer. In the preparation method, firstly, a porous ceramic oxide layer is formed on a magnesium alloy matrix through micro-arc oxidation treatment, so that the corrosion rate of the magnesium alloy is reduced; then, a strontium-doped hydroxyapatite layer is prepared on the surface of the micro-arc oxidation layer by using a chemical deposition method, so that the biocompatibility of the magnesium alloy is improved; and finally, dipping and pulling the magnesium alloy subjected to micro-arc oxidation and chemical deposition treatment in a polylactic acid solution containing nano-hydroxyapatite for one time or multiple times, so as to form a hydrophobic polymer layer. According to the hydrophobic composite layer prepared by the method, the corrosion resistance and the biocompatibility of the magnesium alloy are improved at the same time. The invention also relates to a magnesium alloy implant article comprising the hydrophobic composite layer.

The invention discloses a preparation method of a dianion catalyst and application of the dianion catalyst in catalytic degradation of a polyurethane material. The method comprises the following steps: dissolving metal salt in deionized water to prepare a metal salt solution; the method comprises the following steps: taking a nitrogen heterocyclic compound containing hydroxyl or amino as a substrate in a reactor, dropwise adding a metal salt solution into the reactor, and carrying out reflux condensation at 60-150 DEG C for 1-8 hours; dropwise adding an amine compound, reacting after dropwise adding, and carrying out vacuum filtration treatment after the reaction is ended, so as to obtain filtrate; and evaporating the filtrate and drying the product to obtain the dianion catalyst. The basic physical properties such as the hydroxyl value, the amine value and the viscosity of the recycled polyol obtained through degradation of the catalyst are basically equivalent to those of the raw material polyol, and the recycled polyol can partially replace the raw material polyol to be used for preparing the polyurethane flexible foam.

The present application relates to the field of environment-friendly materials and its preparation technology, and particularly relates to a degradable environment-friendly paper cup interior coating and a preparation method thereof. The method comprises the following steps: firstly, synthesizing polymerizable quaternary ammonium salt surfactant (RPKO-X), and then introducing the polymerizable quaternary ammonium salt surfactant and a bio-based polymer solution into a polyacrylate molecular chain by a redox initiation polymerization method, so as to obtain a degradable acrylate emulsion for paper cup interior coating. By introducing the hydrophobic monomer RPKO-X with emulsifier characteristics, a stronger crosslinking network is formed, which can significantly improve the water resistance and oil resistance of the coating. Meanwhile, by introducing the bio-based material polyvinyl alcohol 2688, the environmental friendliness of the coating is enhanced, and the rapid degradation of the coating after use is promoted. By using the redox initiation polymerization system, the method is simple to prepare, can be prepared under mild conditions, and the emulsion particle size is uniform and stable.

The invention discloses a high-stability povidone-iodine preparation, including polyvinylpyrrolidone K30 15.0%-25.0%, refined iodine 10.0%-12.0%, ethanol 20.0%-30.0%, potassium iodide 2.0-4.0%, organic acid 0.1-1.0%, organic acid salt 0.1-2.0%, surfactant 1.0%-3.0%, stabilizer 1.0%-5.0%, and the rest is water. Compared with the prior art, the invention has the beneficial effects that the povidone-iodine preparation obtained by the invention has good stability, low reaction temperature during the reaction, short total reaction time (only 4h-6h), high iodine yield (low degradation rate), can improve production efficiency, and reduce production energy consumption.

The invention relates to the technical field, in particular to a high-salt organic wastewater degradation composite catalyst. According to the technical scheme, the method comprises the steps of carrier selection, catalyst preparation and catalyst characterization and performance evaluation, the carrier selection comprises the steps of selecting a carrier aluminum oxide with high specific surface area, good pore structure and high chemical stability according to the characteristics of the high-salinity organic wastewater, and fixing metal ions on the carrier through catalyst preparation, and carrying out physicochemical property characterization on the prepared composite catalyst in a catalyst characterization mode, analyzing the chemical state of active components of the catalyst, and evaluating the catalyst through the performance evaluation. Through research and development of the high-salt organic wastewater degradation composite catalyst, the wastewater treatment efficiency can be improved, the cost can be reduced, resource recovery can be promoted, and the environment can be protected.

The invention provides biomass cotton cellulose based on waste cotton textiles and a preparation method thereof, and the method comprises the following steps: crushing the waste cotton textiles, sterilizing, disinfecting, drying, dipping in alkali liquor and cooking, adding a DES eutectic solvent, mixing, pulping the obtained material, bleaching, desanding, concentrating and papermaking to obtain the biomass cotton cellulose. Wherein a metal chlorate catalyst and an auxiliary agent are added during cooking. According to the method, the waste cotton textile is adopted as a raw material, and the cotton cellulose with excellent performance is prepared by performing high-added-value recovery on the waste cotton textile, so that the environmental problem caused by the waste cotton textile can be effectively relieved, and the resource waste is reduced. Meanwhile, the production cost of the cotton cellulose can be reduced, and the problem of insufficient production raw materials of existing biomass cellulose products is solved.

The invention relates to the technical field of polyester resin, and discloses a preparation process of tin-free environment-friendly polyester resin, which is characterized in that dihydric alcohol, dibasic acid, a catalyst, an antioxidant, an acidolysis agent, a curing accelerator and the like are reacted to obtain the tin-free environment-friendly polyester resin. According to the invention, bismuth iso-octoate and 4-dimethylaminopyridine form a compound catalyst to replace a traditional organic tin catalyst, so that the tin-free environment-friendly polyester resin is obtained, and the blank of the tin-free environment-friendly polyester resin is filled. The toxic and side effects are effectively reduced, the environmental pollution is reduced, and the requirements of environment-friendly polyester resin are met. Meanwhile, tris (2-hydroxyethyl) benzene-1, 3, 5-triformate is added to participate in esterification polycondensation reaction, contains a plurality of hydroxyl crosslinking polymerization sites and a heat-resistant benzene ring structure, and is crosslinked into polyester resin molecules, so that the glass-transition temperature, the heat stability and the biodegradability of the resin can be improved.

The invention discloses a preparation method of a fully bio-enzyme-degradable particle, and relates to the technical field of biodegradable materials. The invention uses 5,6-epoxyhexyltriethoxysilane to modify modified calcium carbonate and a trace amount of ferrosoferric oxide, and then disperses them in a cellulose hydrogel precursor solution. When cellulose self-associates into a three-dimensional network structure, the particles are firmly fixed in its micro-nano pore structure, thereby enhancing the stability of the degradation particle matrix, using starch as a water absorbent, epoxy soybean oil as a plasticizer, and modified rigid particle composite cellulose as a reinforcement, and blending with polylactic acid as a carrier, and then, by hot pressing and curing to obtain degradation particles, the inorganic nanoparticles are more firmly combined with the matrix under the dual influence of temperature and pressure, thereby enhancing the mechanical properties of the film.

This utility model discloses a fluorocarbon-free packaging paper. The utility model includes a paper base layer: a first waterproof layer is disposed on the top of the paper base layer, and a second waterproof layer is disposed on the bottom of the paper base layer. A nylon mesh and a degradation layer are disposed on the top of the first waterproof layer. With this utility model, users can tear the food packaging paper along the creases to expose the nylon mesh inside the food packaging paper. Pulling the nylon mesh then cuts the food packaging paper, thereby destroying the oil-proof layer. This breaks down the overall structure of the paper base layer, the first waterproof layer, the second waterproof layer, the reinforcing layer, and the oil-proof layer, allowing them to fully contact the outside environment and increasing the degradation rate of the food packaging paper. Furthermore, the waterproof adhesive, the first oil-proof adhesive, the second oil-proof adhesive, and the oil-proof layer are disposed on the food packaging paper, preventing the food packaging paper from being soaked in oil or water. The nylon mesh facilitates the separation of the printed layer and the food packaging paper, promoting the degradation of the food packaging paper.

This invention provides a method for preparing Ni3C / Bi5O7I composite material and its application, relating to the field of photocatalysis technology. The preparation method includes: Step 1: Adding KI to a suspension containing Bi(NO3)3·5H2O and NaOH, stirring, and then carrying out a hydrothermal reaction. The resulting product is cooled to room temperature, centrifuged, washed, and dried to obtain Bi5O7I; Step 2: Adding nickel acetate to an oleylamine aqueous solution under a nitrogen atmosphere, carrying out a hydrothermal reaction, cooling to room temperature, and the resulting precipitate is centrifuged, washed, and dried to obtain Ni3C; Step 3: Adding Bi(NO3)3·5H2O solution dropwise to a suspension containing Bi5O7I and Ni3C under vigorous stirring, and then carrying out a hydrothermal reaction. The resulting precipitate is centrifuged, washed, and vacuum dried to obtain Ni3C / Bi5O7I. This invention improves the photocatalytic activity of Bi5O7I by introducing Ni3C into it, and gives the resulting photocatalytic material the ability to efficiently and stably degrade phenol in water, which has potential application value in the field of phenol-containing wastewater purification.

The invention discloses a biodegradable PAET / PGA blended skin-core composite fiber which is prepared by taking PAET as a skin layer and a blend of PAET and PGA as a core layer through a skin-core composite melt spinning process. Wherein the mass ratio of the skin layer to the core layer is (1: 9)-(3: 7), and the mass fraction of PGA in the PAET and PGA blend forming the core layer is 5-15%. The preparation method comprises the following steps: (1) drying; (2) respectively melting and extruding the skin layer PAET slice and the core layer PAET and PGA blend through a screw extruder to prepare continuous nascent fibers; (3) carrying out circular blowing cooling treatment on the nascent fiber; (4) drafting and winding the cooled nascent fiber; and (5) preparing the PAET / PGA blended sheath-core composite fiber. The environment-friendly plastic has good biodegradability, meets the requirements of different fields while reducing environmental pollution, gives consideration to both mechanical properties and service life, and achieves the purposes of environmental protection and ecology.

The invention discloses a preparation method and application of a graphite phase carbon nitride loaded manganese phthalocyanine heterogeneous catalyst, according to the method, manganese phthalocyanine is loaded on graphite phase carbon nitride by adopting a chemical deposition / loading method to obtain a MnPc / CN heterogeneous catalyst, under the room temperature condition, compared with unloaded manganese phthalocyanine, the catalytic activity of the catalyst is effectively improved, and the performance of the catalyst is improved. Finally, the catalyst which is efficient and has a very good application effect in an actual complex water environment is obtained. The graphite-phase carbon nitride loaded manganese phthalocyanine heterogeneous catalyst prepared by the invention can activate peroxymonosulfate to degrade levofloxacin in a water environment, can significantly improve the degradation rate of levofloxacin, and has good resistance to an actual complex water matrix.

The invention discloses an anaerobic biological treatment process combining ceramic membrane pretreatment with a magnetic method and a heat preservation system, and relates to the technical field of anaerobic biological treatment. The ceramic membrane pretreatment combined magnetic method and thermal insulation system comprises the following steps: step 1, environmental data acquisition: carrying out water quality sampling on a to-be-treated water source before equipment is installed, and adjusting the installation position of the device according to the water quality and particles in the water source; 2, the equipment comprises sewage pretreatment equipment, strong magnetic treatment equipment, a heat preservation system, EGSB reaction equipment and intelligent discharge equipment; a water pipe penetrates through the cylindrical magnet and surrounds the magnet for several circles, so that wastewater in the water pipe is magnetized, calcium carbonate crystals easy to remove are generated by changing the crystal phase of calcium carbonate, deposition of dirt in a pipeline and equipment can be effectively reduced, the service time of the pipeline and the equipment is prolonged, and the replacement frequency is reduced; meanwhile, the magnet is used for magnetizing the wastewater, so that the use of chemicals can be reduced, the cost is reduced, and the environmental pollution is avoided.

The invention discloses an antibacterial easily-degradable plastic bottle cap and a preparation method thereof, and belongs to the field of plastic degradation. The antibacterial easy-to-degrade plastic bottle cap is mainly prepared from polylactic acid (PLA), and the antibacterial easy-to-degrade plastic bottle cap is mainly prepared from the following components in parts by weight: 50 to 60 parts of polylactic acid, 20 to 30 parts of polyhydroxyalkanoate, 10 to 15 parts of argil, 0.5 to 3 parts of quaternary ammonium salt, 0.1 to 0.5 part of antioxidant, 2 to 5 parts of stabilizer, 5 to 8 parts of plasticizer, 0.5 to 1.5 parts of lubricant and 2 to 5 parts of coloring agent. A large number of ester bonds-COOR exist on a main chain of polylactic acid, and the ester bonds-COOR are chemical bonds most likely to break in organic matter, so that polylactic acid is easy to degrade, polylactic acid can be degraded within 8-25 weeks under the composting condition and can be completely degraded within 3-5 years under the natural condition, the degradation time of traditional plastic is more than one hundred years, and polyhydroxyalkanoate is adopted as an auxiliary material, so that the cost is reduced, and the environment is protected. The polyhydroxyalkanoate is an intracellular polyester synthesized by many bacteria, and after the polyhydroxyalkanoate is fused with the polylactic acid, the biodegradability is further improved.

The present invention relates to a chitosan oligosaccharide fermentation control method and system, and relates to the technical field of fermentation control, including: obtaining a fermentation control parameter space, randomly generating multiple initial fermentation control parameters, performing chitosan dissolution analysis according to the initial pH and initial chitosan concentration in the initial fermentation control parameters, obtaining multiple initial chitosan dissolution parameters, performing contact analysis between enzyme and chitosan, obtaining multiple initial chitosan contact parameters, performing contact analysis between enzyme and oxygen, obtaining multiple initial oxygen contact parameters, respectively combining multiple initial fermentation times to perform chitosan oligosaccharide fermentation prediction, obtaining multiple fermentation yield parameters and multiple overdecomposition parameters, and calculating multiple initial fermentation fitnesses; continuing to perform iterative optimization of fermentation control parameters, obtaining optimal fermentation control parameters, and performing chitosan oligosaccharide fermentation control. The present invention achieves the technical effect of considering the contact between enzyme, chitosan and oxygen, optimizing chitosan fermentation control and improving fermentation effect.

The application discloses an environment-friendly anti-static bubble bag and belongs to the technical field of bubble bags. The bubble bag comprises an upper bag body, a lower bag body and a bag sealing assembly which are matched with each other. The upper bag body and the lower bag body are both made of degradable materials. Bubble film layers are compounded on the outer walls of the upper bag body and the lower bag body. Anti-static coating layers are arranged on the outer surfaces of the upper bag body and the lower bag body. The bag sealing assembly is detachably connected to the butt joint positions of the upper bag body and the lower bag body. The upper bag body and the lower bag body are detachably separated through the detachable bag sealing assembly. The upper bag body and the lower bag body are made of degradable materials. The outer walls of the upper bag body and the lower bag body are compounded with bubble film layers, so that the cushioning and protection performance is considered. The bag body can be disassembled when the articles are taken out through the detachable design of the bag sealing assembly, so that the inner wall of the bubble bag without the anti-static coating layer is fully exposed. The degradable base material can be greatly accelerated in the degradation rate. The packaging protection practicability, the anti-static safety and the whole-cycle environment-friendly adaptability are considered.

The invention discloses an efficient degradation low-density magnesium-based alloy and a preparation method and application thereof. The invention belongs to the technical field of magnesium-based alloys for fracturing balls. The technical problems that an existing fracturing ball is high in density and difficult to flow back or drill and mill after being used are solved. According to the Mg-Li-based alloy provided by the invention, the proportion of Mg, Gd and Ni is reasonably regulated and controlled, so that the fracturing ball prepared from the degradable Mg-Li-based alloy has the advantages of good plasticity and toughness, high specific strength, high pressure bearing capacity and high primary corrosion degradation rate, the fracturing ball can be quickly dissolved underground after fracturing operation is completed, the efficiency of the fracturing operation is effectively improved, and the fracturing cost is reduced. Therefore, the petroleum production efficiency is greatly improved, and the petroleum production cost is reduced.