41 results about "Degradation reaction" patented technology

The invention relates to a synthesis method of milobalin or acid salt thereof, and belongs to the technical field of medicine synthesis. In order to solve the problem that chiral resolution needs to be adopted in the prior art, the invention provides a synthesis method of miloabalin or an acid salt thereof, which comprises the following steps: under the action of an organic strong base, carrying out Michael addition reaction on a compound shown as a formula III and acetonitrile in a non-polar organic solvent at a low temperature of-50 DEG C or below to obtain an intermediate product; under the alkaline condition, the intermediate product is subjected to an oxidation reaction and a hydrolysis reaction under the action of an oxidizing agent, after the reaction is finished, an intermediate product is obtained through acidification, and the intermediate product is subjected to a high-temperature decarboxylation reaction in an aprotic solvent to obtain a compound of a formula VI; and carrying out Hofmann degradation reaction on the compound of formula VI to obtain the compound of formula I miloabalin or miloabalin acid salt. The method has the advantages of high stereoselectivity, no need of chiral resolution operation, avoidance of the problem of large material loss caused by resolution, high chiral purity and high yield.

The invention belongs to the technical field of medicine manufacturing, and particularly relates to a compound preparation containing faropenem sodium as well as a preparation method and application of the compound preparation. According to the invention, the production prescription is optimized, the stability of the medicine can be effectively improved, the unpleasant smell of the medicine is covered, and the medication compliance of children is obviously improved. The epigallocatechin-aluminum complex can serve as a free radical scavenger in a preparation system, oxygen free radicals are effectively captured and neutralized, and the influence of oxidative stress on the medicine is reduced; moreover, the existence of aluminum ions not only enhances the stability of EGCG, but also reduces the drug degradation reaction under the catalysis of the ions through chelation with trace metal ions (such as iron, copper and the like) in the preparation. In addition, aluminum ions can also directly form a stable complex with faropenem sodium, so that the chemical stability of the faropenem sodium is further improved.

The application provides a method for treating organic wastewater by using coconut shell biochar persulfate activator, which comprises three steps of preparing coconut shell biochar persulfate activator, constructing a reaction system and performing a degradation reaction. When the degradation reaction is performed under the reaction system constructed by the application at a low temperature of 5 DEG C, the degradation treatment efficiency is almost the same as that under a high temperature of 55 DEG C. The method breaks through the temperature restriction of the traditional persulfate activation method for treating wastewater, so that the persulfate activator has a wide application prospect in the treatment of printing and dyeing organic wastewater, especially in winter or high-latitude cold regions.

The present application relates to wastewater treatment technical field, and particularly discloses a kind of processing method of containing polynitro phenol nitration wastewater.The processing method is with the wastewater generated by benzene nitration as processing object, its characteristics are: component analysis is carried out to wastewater, and model water sample is prepared; after adjusting the pH of model water sample, multistage extraction is carried out, and then static stratification separation is carried out; degradation aid is added to water sample after extraction, and then water sample is transported into tubular preheater by high-pressure pump, and discharged after pre-treatment; water sample is pumped into the next stage tubular reactor, and discharged after reaction, and water sample with polynitro phenate removal rate greater than 99.9% is obtained; the actual nitration wastewater of factory is treated by the above method.The present application does not need to add additional oxidant, and reduces the safety risk of operation process; by adding a small amount of organic acid, the stable structure of polynitro phenol molecule is broken, and the closed-loop promoting effect of degradation reaction process is promoted, which greatly improves the safety and economy of process method.

This invention discloses a method for the photocatalytic degradation of bisphenol A and the synergistic generation of H2O2 based on O-ZnIn2S4, comprising: adding the O-ZnIn2S4 photocatalytic material to wastewater containing bisphenol A, and performing photocatalytic degradation of bisphenol A and in-situ generation of H2O2 under visible light irradiation. Under light conditions, the O-ZnIn2S4 photocatalytic material of this invention exhibits excellent activity in the organic matter degradation reaction, while its H2O2 generation rate is high. The system of this invention achieves synergistic coupling of organic pollutant removal and in-situ hydrogen peroxide generation, providing a new photocatalytic strategy for green and efficient hydrogen peroxide synthesis and environmental remediation.

This invention relates to the field of polymer material degradation and recycling technology, and provides a process for the efficient degradation of PET using alcoholysis under low-temperature conditions, comprising the following steps: S1, raw material preparation and degradation reaction: waste PET fragments and ethylene glycol are added to a reaction vessel, stirred at 120-150℃, a composite catalyst is added, and the degradation temperature and pressure are controlled. The reaction is carried out for 2-6 hours to obtain a reaction solution; S2, separation: the reaction solution is filtered to separate solid and liquid components. The solid component enters the recycling system, and the liquid component enters the recrystallization system; S3, recrystallization: water is added to the recrystallization system, the mixture is cooled and crystallized, filtered, and the resulting solid enters the degradation system. The resulting liquid undergoes secondary crystallization. After crystallization, the solid obtained is filtered to obtain the product BHET, which is dried and collected. The filtered liquid enters the purification system; S4, purification; S5, crystallization. The preparation method of this invention provides a process for the alcoholysis degradation of PET, which has the advantages of low PET degradation temperature and high BHET yield.

The present disclosure relates to a kind of iron-based amorphous alloy and its preparation method and the application of degrading tetracycline antibiotics, the molecular formula of iron-based amorphous alloy is FexSiyBz, wherein x, y, z respectively represent the atomic percentage of Fe, Si, B in alloy, 74≤x≤84, 6≤y≤16, 6≤z≤16, and x+y+z=100;Preparation method includes: S1, raw material is proportioned in smelting furnace under inert atmosphere and is smelted to prepare iron-based amorphous alloy;S2, the iron-based amorphous alloy prepared in step S1 is prepared into iron-based amorphous alloy strip by single-roll casting method;The application of degrading tetracycline antibiotics is that the iron-based amorphous alloy is applied to the treatment of wastewater containing tetracycline antibiotics, for degrading tetracycline antibiotics;The present application is more difficult to occur passivation in degradation reaction, and it is convenient to recycle.

The invention relates to a dynamic tubular reactor for degradation reaction, which comprises a reactor body, a reactor inner cavity is arranged in the reactor body, a stirring paddle is vertically arranged at the center in the reactor inner cavity, the stirring paddle comprises a main shaft, a plurality of spiral stirring blades are arranged on the outer side of the main shaft along the axial direction, and a baffle is arranged between two adjacent spiral stirring blades. The baffle is of an annular structure and is fixed on the side wall of the inner cavity of the reactor, and the spiral stirring blade is matched with the baffle; a heating structure is arranged on a shell of the reactor body and is used for heating the reactor; a first material inlet and a second material inlet are formed in the bottom of the reactor body, a liquid outlet is formed in the middle, and a gas outlet is formed in the upper part. According to the dynamic tubular reactor for the degradation reaction provided by the invention, the mutual cooperation between the spirally rising stirrer and the baffle plate is utilized, so that the liquid is ensured to be fully mixed and reacted, and the liquid is ensured not to have a back-mixing phenomenon, so that the liquid has enough residence time in the reactor.

The application discloses a numerical simulation method of an electrically assisted microbial remediation process, and belongs to a numerical simulation method system. First, a conceptual model, chemical substance setting, initial condition and boundary condition of a research area are determined through initialization research area setting. Then, the number of simulation nodes is set based on grid self-adaptive division. A migration model established by Nernst-Planck-Poisson equation is considered in COMSOL software based on a migration-reaction operator separation method, so as to describe processes such as convection, dispersion, electromigration and electroosmotic flow related to material migration in groundwater. In PHREEQC, the influence of microbial growth on the permeability coefficient and the multivariate inhibition Monod degradation reaction are considered. Finally, the CPM-BIO numerical simulation method is formed by combination, so that the electrically assisted microbial remediation process can be simulated in detail. Compared with existing calculation models, the CPM-BIO can realize the detailed description of the electrically assisted microbial remediation numerical simulation process with multiple dimensions and multiple reactions.

The present application relates to a kind of water body antibiotic and its degradation intermediate toxicity determination device and method, belong to the detection technical field of water antibiotic.The determination device includes: degradation reaction chamber, degradation reaction chamber is horizontally arranged flat plug flow reactor, the two ends of flat plug flow reactor are continuous water inlet and continuous water outlet respectively;Degradation reaction chamber is provided with fixed matrix, and microbial membrane or photodegradation material is attached on fixed matrix, or continuous inlet section is connected with chemical oxidant;The bottom of degradation reaction chamber is provided with multiple low-flow water outlets at the distance set along length direction;Low-flow water outlet is connected with toxicity detection device;The flow ratio of single low-flow water outlet and continuous water outlet is 1:(300-1000), and the number of low-flow water outlet is 3-10.In flat plug flow reactor, the time difference of antibiotic degradation process can be reflected from different low-flow water outlet position, so toxicity is determined at each point, and the toxicity of antibiotic matrix and intermediate product can be more accurately obtained.

The present application relates to the field of carbon dioxide capture, and discloses a method and system for reducing degradation loss of flue gas carbon capture absorption solvent, comprising stripping oxygen from the absorption solvent rich solution to obtain oxygen-containing stripping gas and spent absorption solution; the spent absorption solution is regenerated to obtain regenerated gas and absorption solvent lean solution, wherein at the same time, the oxygen-containing stripping gas is used to extract the regenerated gas, the method provided by the present application adds a stripping oxygen removal step, first strips oxygen from the CO2-rich absorption solvent rich solution after absorption, and regenerates the oxygen physically dissolved in the absorption solvent rich solution, thereby reducing the oxygen concentration in the absorption solvent, and further reducing the possible degradation reaction, then using the obtained oxygen-containing stripping gas to extract the regenerated gas during regeneration, reducing the operation pressure during regeneration to reduce the operation temperature, thereby reducing the degradation reaction rate, and achieving the purpose of reducing the degradation loss of flue gas carbon capture absorption solvent.

The present application relates to a kind of water aquaculture water microbial purifier in the method for enhancing nitrification denitrification effect, the working time period of water aquaculture water microbial purifier is divided into nitrification time period and denitrification time period, effectively utilize the sludge mixed solution in the bottom of biological packing, not only can improve the utilization of equipment, realize nitrification denitrification complete process, also can reduce equipment space occupation;Under nitrification time period, biological packing is in aerobic environment, and aerobic microorganism can carry out normal nitrification reaction, reduce the ammonia content in biological packing;And under denitrification time period, the sludge mixed solution in the bottom of purifier is introduced into biological packing and released, reduce the oxygen content in biological packing, anaerobic microorganism can carry out cultivation and denitrification degradation reaction in this environment, and sludge mixed solution can supplement necessary carbon source for denitrification reaction, provide compensation function for guaranteeing denitrification process, strengthen sufficient nitrification denitrification effect.

This application relates to the field of tobacco flavoring technology, providing a tobacco flavoring and quality improvement device and its method of use for enhancing cellulose degradation. The device includes: a housing, electrodes, a power supply system, a water replenishment and humidification system, and a heat preservation system. The housing is equipped with several degradation reaction zones. Tobacco and microbial agents are mixed and added to the degradation reaction zones. Each degradation reaction zone is equipped with an electrode, which is electrically connected to the power supply system. The water replenishment and humidification system sprays water into each degradation reaction zone, and the heat preservation system heats and maintains the temperature of each degradation reaction zone. The electrodes divide the housing into multiple appropriately sized degradation reaction zones. An external low-voltage electric field enhances the microbial degradation activity, breaking down the energy barrier for microbial degradation of cellulose and improving the degradation of hemicellulose, which is difficult to bioutilize. Simultaneously, it solves the problem of excessively high external power supply voltage due to the large volume of the degradation reaction zones, ensuring the feasibility and economy of the process.

The application discloses fucoidan oligosaccharide and a preparation method and application thereof, and belongs to the technical field of substance extraction and preparation; the preparation method of the fucoidan oligosaccharide provided by the application comprises the following steps: hydrogen peroxide solution and nano-mesoporous material are added into a fucoidan polysaccharide aqueous solution, and after uniform stirring, a degradation reaction is carried out under the assistance of microwaves; after the degradation reaction is completed, catalase is added, and then filtration is carried out, and a filter cake is collected; sodium chloride solution is added into the filter cake for elution replacement, and an eluate is collected and concentrated through nanofiltration, washed, and freeze-dried to obtain the fucoidan oligosaccharide. The obtained fucoidan oligosaccharide has uniform molecular structure, relatively complete sulfate group, relatively narrow molecular weight distribution and high anti-inflammatory activity; and the preparation method provided by the application has high degradation efficiency, does not need high-cost enzymes or complex equipment, is simple to operate and easy to realize actual production.

The invention belongs to the technical field of antibiotic-containing water treatment, and discloses a method for removing antibiotics in water by using Cu-ZIF-8 to activate peracetic acid, which comprises the following steps: adding a Cu-ZIF-8 composite material and peracetic acid into antibiotic water to obtain a first mixed solution; the initial concentration of antibiotics in the antibiotic water body is 1 [mu] mol / L to 10 [mu] mol / L, the addition amount of the Cu-ZIF-8 composite material is 0.010 g / L to 0.100 g / L, and the addition amount of the peracetic acid is 0.05 mmol / L to 0.40 mmol / L; the first mixed solution is stirred or oscillated, so that the first mixed solution is subjected to a degradation reaction, and the antibiotics in the water body are removed. The method has the advantages of simple and convenient process, rapid reaction, efficient removal, wide pH application range, environmental friendliness and the like, and has important scientific significance and application value in effective control of antibiotic pollution in water.

This invention relates to the field of environmental protection and organic waste resource utilization technology, and discloses an organic pollutant degradation device based on pear pomace-based biochar. The device includes a pretreatment unit, a biochar activation reactor, a multi-stage series degradation reaction mechanism, and a solid-liquid separation unit. A biochar regeneration unit is located above the biochar activation reactor. The inlet of the biochar activation reactor is connected to the outlet of the pretreatment unit. The inlet of the multi-stage series degradation reaction mechanism is connected to the inlet pipe of the organic wastewater to be treated. This organic pollutant degradation device and treatment method based on pear pomace-based biochar, by setting up a three-stage series gradient degradation reaction mechanism and combining the synergistic effect of biochar adsorption and persulfate advanced oxidation, can achieve efficient and thorough removal of recalcitrant organic pollutants, significantly improving the device's treatment load and resistance to shock loads.

The invention relates to the technical field of polymer degradation, and discloses a degradation method of a cross-linked high-molecular material, which comprises the following steps: adding at least one of dichloroethane, dichloromethane and chloroform and an amphoteric permeation carrier into crushed cross-linked high-molecular material for swelling treatment, and adding anhydrous ferric trichloride for constant-temperature permeation treatment; then adding benzaldehyde and at least one of triphenylphosphine and polyethylene glycol dimethyl ether for in-situ complexing activation to obtain mother liquor to be reacted; carrying out degradation reaction on the mother liquor to be reacted under the condition that the temperature is 85 to 120 DEG C and the pressure is 0.5 to 1.5 MPa and is in periodic gradient fluctuation; and finally, adding a quenching agent into the degradation liquid to terminate the reaction, and separating and purifying to obtain the oligomer. Through the synergistic effect of swelling permeation, in-situ activation and pressure fluctuation physical disturbance, embedding and efficient reaction of a catalytic active center in a three-dimensional network are achieved, and an oligomer product with narrow molecular weight distribution and complete active end group retention is obtained.

Reagents and methods for the digital analysis of proteins or peptides are provided. Specifically provided herein are proteins for identifying the N-terminal amino acid or N-terminal phosphorylated amino acid of a polypeptide. Also, an enzyme for use in the cleavage step of the Edman degradation reaction and a method for using this enzyme are described.

This invention relates to a method for preparing a silicon-modified montmorillonite-supported ultra-efficient zero-valent iron (ZVFe) material, specifically a method for preparing montmorillonite-supported nano-ZVFe materials. The invention aims to address the technical problems of existing nano-ZVFe materials, such as easy particle aggregation, weak migration ability, and difficulty in selectively removing pollutants. This invention proposes a method for preparing silane-modified montmorillonite-supported nano-ZVFe. This material can be used to treat organic pollutants in soil and groundwater. Compared with traditional ZVFe materials, it has advantages such as strong hydrophobicity and high reactivity, enabling efficient treatment of organic pollutants. Furthermore, this material can contain water in its interlayer, providing protons for degradation reactions in the pure organic phase, thus achieving the effect of degrading organic pollutants. The silane-modified montmorillonite-supported nano-ZVFe provided by this invention is suitable for groundwater and soil remediation, especially for the removal of organic matter from water bodies, exhibiting excellent removal effects on hydrophobic organic matter in water.

This invention discloses a method for treating microplastics in water, belonging to the field of water environment management technology. This invention utilizes laser plasma to degrade microplastics. The laser plasma can not only directly act on the surface of microplastics to promote degradation, but also act on an iron substrate to generate iron / iron oxide nanoparticles adsorbed on the surface of the microplastics. These nanoparticles participate in the subsequent degradation reaction in the UV / H2O2 system. Compared with traditional Fenton reaction degradation, the pretreated microplastics show better degradation performance in the UV / H2O2 system, and can degrade PE microplastic particles into smaller particles more quickly, reducing the particle size to below nm.

The invention discloses a Ce / Ru composite modified catalyst as well as a preparation method and application thereof, and relates to the technical field of catalysts. According to the preparation method of the Ce / Ru composite modified catalyst provided by the invention, the SBA-15 molecular sieve is adopted as the carrier, firstly, the Ce element is introduced in the synthesis process of the carrier to modify a pore channel, then the Ru element is loaded on the surface of the carrier, and due to introduction of the Ce element, the interaction between Ru and the carrier is improved, the dispersity of the Ru element is improved, and agglomeration and sintering of the Ru element are prevented; meanwhile, the Ce element can optimize the reaction microenvironment, so that the catalyst provided by the invention has excellent catalytic activity on the degradation reaction of polyolefin, and selectivity and long-range stability of C5-C21 hydrocarbons.

The invention discloses a method for determining a dissolution curve of atorvastatin calcium in an acidic medium, and belongs to the technical field of pharmaceutical analysis. The determination method provided by the invention comprises the following steps: dissolving an atorvastatin calcium drug to be determined in an acidic dissolution medium under a stirring condition, taking out a dissolution solution at different dissolution times, centrifuging, taking a supernatant, adding the supernatant into a stabilizer, and uniformly mixing to obtain a test solution; detecting the content of atorvastatin calcium in the test solution by adopting high performance liquid chromatography to obtain dissolution rates at different time; establishing a dissolution curve according to the dissolution rate and the dissolution time; wherein the stabilizer is a mixed solution of an organic solvent and an alkali metal hydroxide water solution. According to the method, through the solubilizing effect of the organic solvent and the dual synergistic mechanism of the alkaline environment, the degradation reaction and drug precipitation process continuously occurring after the sample is taken out is effectively inhibited, and the accuracy of the dissolution rate detection result is remarkably improved.

The invention discloses a method for synergistically degrading micro-plastics by copper ions and laccase, which comprises the following steps: simultaneously adding laccase and copper ions into a buffer solution to form a reaction system; adding the micro-plastic into the reaction system and dispersing; carrying out degradation reaction under a constant-temperature oscillation condition; and evaluating the degradation effect of the reacted micro-plastic in at least one mode of morphology characterization, mass loss, surface oxidation analysis or product detection. According to the application, the degradation efficiency is greatly improved, the synergistic treatment group shows the most obvious microplastic particle size reduction and mass loss macroscopically, and microplastic surface erosion, pores and spalling are observed through an SEM image microcosmically. The method is mild in condition and environment-friendly, the reaction is carried out under the mild condition that the pH is close to neutral and the temperature is 40 DEG C, high-temperature, high-pressure or strong chemical reagents are not needed, and a new green way is provided for microplastic pollution treatment.

The present application relates to wastewater treatment technical field, specifically to a kind of production process for treating high concentration PAM wastewater, comprising the following process steps: S1.modification degradation agent is added to degrader preparation tank, then it is transported to the mixer of degradation reactor by delivery pump;S2.high concentration polyacrylamide wastewater is transported to the mixer, and after mixing is completed, degradation reaction is carried out in degradation reactor;S3.by overflow pipe overflow to the layered zone of layered concentration tank and carry out layering, the clarified water of upper layer is sent to biochemical advanced treatment system;Lower layer sludge is settled to sludge concentration area and is further concentrated, and then concentrated sludge is transported to dehydration system by concentration delivery pump.The present application greatly reduces the COD and alpha-NH3 concentration of final effluent;Polyacrylamide and microcolloid material are rapidly degraded in early production, thereby greatly reducing the viscosity of wastewater, improving the capacity and efficiency of device;Dry matter in wastewater is efficiently separated.

The present disclosure discloses a method for removing TBBPA in water, a microbial strain and a microbial agent, wherein the microbial strain is a domesticated Burkholderia cepacia strain, which is named Y17 with a conservation number GDMCC No. 62153. The microbial agent and the method for removing TBBPA in water with the microbial agent are that Y17 strains are colonized on the surface and pore channels of biochar, TBBPA in water is used as a carbon source, air and dissolved oxygen are used as oxygen sources, biochar provides the strains a growth microenvironment for degrading TBBPA in water, the strains are subjected to aerobic growth in water, and bio-enhanced degradation of TBBPA in water is performed by continuously degradation reaction. The removal method and the microbial strain as well as the microbial agent are high in degradation efficiency, environmental-friendly and low in cost, and can meet requirements on large-range promotion and application.

The present application relates to the technical field of water treatment, and discloses a method for degrading and treating organic pollutants in a drainage basin, comprising: introducing drainage basin sewage with fluctuating flow and load, using a preset flow pattern of a flow distribution member to distribute the drainage basin sewage into a degradation flow direction and an overload flow direction, guiding the degradation flow direction to contact a multistage anaerobic biofilm attached to the surface of the filler to generate a degradation reaction, the preset flow pattern having a geometric interface that adjusts the flow area according to the water level, when the flow exceeds the preset load limit, a flow distribution ratio that increases nonlinearly with the rising water level is generated, so that the internal flow field shear stress of the main degradation zone is maintained within the adhesion strength threshold of the multistage anaerobic biofilm, the present application uses a physical pattern to preset the hydraulic distribution rule, ensures the adhesion stability of the biological community under the impact of runoff, and maintains the degradation activity of the system in a variable working condition environment.

The invention belongs to the technical field of environmental catalysis, and particularly relates to a Mn-doped UiO-66 catalyst and application of the Mn-doped UiO-66 catalyst in activating periodate to degrade organic pollutants. The prepared MU-66 material is used as a catalyst, the activation capacity of periodate (PI) can be remarkably enhanced, complete degradation of sulfonamide isoxazole (SIZ) is achieved within 14 minutes, the first-level kinetic rate constant of an MU-66 / PI water pollutant degradation reaction system for SIZ degradation is about 66 times that of a UiO-66 / PI system, and in addition, the first-level kinetic rate constant of the MU-66 / PI water pollutant degradation reaction system for SIZ degradation is about 66 times that of a UiO-66 / PI system. The MU-66 shows stable performance under various water quality and operation conditions, provides technical support for simple preparation of the UiO-66-based catalyst and development of periodate activation technology in water purification application, and has wide application prospects in sewage treatment, water body reduction, adsorption and degradation and the like.

The invention provides a cyclic regeneration process of a high-purity electronic-grade fluorine-containing etching solution, and relates to the technical field of etching solutions, according to the cyclic regeneration process of the high-purity electronic-grade fluorine-containing etching solution, waste scrap iron is used for replacing copper ions in waste liquid, resource regeneration is achieved by using waste to treat waste, and the influence of initial pH and scrap iron adding amount on reaction and optimal reaction conditions are discussed; then a two-stage Fenton process is adopted to degrade the organic pollutants, the dosage and the influence of the dosage on the degradation reaction are investigated, and the optimal reaction condition is optimized; the prepared copper powder is characterized by adopting SEM-EDS, XPS and XRD, and the purity of the copper powder is analyzed, so that the method is low in equipment requirement and low in investment cost; according to the method, wood-shaving-shaped scrap iron is adopted for replacement, separation of Fe and Cu elementary substances in precipitates is avoided, and meanwhile the product purity is improved.

A method for starch degradation includes the following steps. Acetylated adipic acid distarch, acid and polar solvent are mixed to form a starch suspension. The temperature of the starch suspension is adjusted to -23℃ to 47℃, and a degradation reaction is performed to form a first degraded starch solution. A base is added to raise the pH value of the first degraded starch solution to obtain a second degraded starch solution. The method for starch degradation has the advantage of simple process. A method for making an oil-proof composite layer includes the following steps. Acetylated adipic acid distarch with a weight average molecular weight of 3.00×10 6 to 5.50×10 7 and a polar solvent are mixed to obtain a starch solution. The starch solution is gelatinized to form a gelatinized starch solution. The gelatinized starch solution is attached to a substrate and a drying process is performed to form an oil-proof composite layer. The oil-proof composite layer has good oil-proof degree and can be applied to various packaging containers that require oil-proof isolation, especially food packaging containers, which has great industrial applicability.

The application discloses an enzyme composition for microplastic degradation, a preparation method and application thereof. The enzyme composition comprises plastic degradation enzyme and emulsifier. The emulsifier is selected from a combination of one or more of lignosulfonate, sulfobetaine emulsifier, fatty alcohol polyoxyethylene ether sulfate and C12-C18 alkyl polyoxyethylene ether sulfate. The application also provides a plastic degradation method, which comprises the steps of mixing plastic and the aforementioned enzyme composition, and performing a degradation reaction. The enzyme composition can be used for microplastic degradation, and has improved degradation efficiency and degradation activity. It is expected to be used in the environmental governance of microplastics.