CN112662014A - High-barrier antibacterial composite film based on nano-cellulose/MXene immobilized nano-silver and preparation method and application thereof - Google Patents
High-barrier antibacterial composite film based on nano-cellulose/MXene immobilized nano-silver and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a high-barrier antibacterial composite film based on nano-cellulose/MXene immobilized nano-silver and a preparation method thereof. The method comprises the following steps: preparing nano silver by using tea polyphenol as a reducing agent, and fixing the nano silver by using MXene as a template to prepare the MXene-immobilized nano silver composite antibacterial agent; and adding the nano-silver/MXene immobilized nano-silver composite membrane into nano-cellulose, and taking glycerol as a plasticizer to obtain the nano-cellulose/MXene immobilized nano-silver composite membrane. The oxygen transmission rate of the composite membrane is only 0.04cm3/m224h 0.1MPa far lower than common PE preservative film(48.59cm3/m224 h.0.1 MPa, reference standard GB/T1038), and has high barrier property; the composite film has antibacterial performance, can effectively inhibit the growth of pathogenic bacteria, prolongs the shelf life of food, and meets the requirements of modern food active packaging.
Description
Technical Field
The invention relates to the field of food packaging materials, in particular to a high-barrier antibacterial composite film based on nano-cellulose/MXene immobilized nano-silver, and a preparation method and application thereof.
Background
The food is vulnerable to light, moisture, oxygen and microorganisms during storage and transportation, resulting in shortened shelf life and reduced food quality. The packaging film with high barrier property can effectively block oxygen, moisture, illumination and the like, can effectively protect the quality of packaged objects and prolong the quality guarantee period of the packaged objects. In recent years, the most widely used high barrier packaging film materials are mainly derived from synthetic plastics of fossil fuel resources. Although these plastics have low cost, good processability and mechanical properties, and strong barrier properties, their widespread use poses serious environmental pollution, depletion of fossil fuel resources, and the like.
Cellulose is used as an environment-friendly natural polymer material, and has the advantages of wide source, rich content, various types, biocompatibility, reproducibility, degradability and the like. Several studies have demonstrated that cellulose can be used as a matrix or reinforcing filler in combination with other polymers to form barrier composite films for packaging applications, particularly nanocellulose. The small diameter of the nano-cellulose can form a compact and uniform microstructure, greatly increases the mechanical strength, specific surface area, light transmittance and barrier property of the nano-cellulose material, and is a potential barrier film material. Wu et al have prepared composite membranes with improved mechanical and barrier properties using nanocellulose, grape seed extract (Wu Z, Deng W, Luo J, et al. Multifunctional no-cellulose composite films with grain sections and immobilized nanoparticles [ J ]. Carbohydrate polymers,2019,205: 447-. However, the barrier properties of the film still do not satisfy the barrier properties of most foods, and thus a method for preparing a more excellent nanocellulose-based barrier film needs to be searched for.
MXene (e.g. Ti)3C2Tx) Is widely used as a two-dimensional nanosheet material which develops rapidly. The structure of the modified graphene is similar to that of carbon-based materials such as graphene and carbon nanotubes, and the groups on the surface of the stripped MXene have excellent hydrophilicity, so that the modified graphene has good interface compatibility with natural biomaterials. Therefore, MXene can interact with nanocellulose to form a high-barrier composite membrane with a complex structure.
With the improvement of health requirements of people, the development of antibacterial packaging is rapid. The nano silver is used as a spectrum antibacterial agent and widely applied to antibacterial packaging of foods. Although nano silver has the effects of inhibiting and killing dozens of microorganisms such as escherichia coli and staphylococcus aureus and can not generate drug resistance, research shows that excessive nano silver can generate certain accumulated toxicity to human bodies and ecological environments in practical application. MXene has rich nano-sheet layer structure and active sites, and can be used for fixing and reducing nano metal particles. Therefore, MXene can be used for immobilizing the nano silver, and then the one-dimensional nano cellulose and the two-dimensional MXene are stacked and crossed to form a complex microstructure, so that the high-barrier antibacterial composite membrane is obtained.
Disclosure of Invention
The invention aims to provide a multifunctional composite film for food packaging, in particular to a nano-cellulose/MXene immobilized nano-silver composite film with high barrier property and antibacterial activity, aiming at the defects of the prior art.
The invention also aims to provide a preparation method of the nano-cellulose/MXene immobilized nano-silver high-barrier antibacterial composite film. The preparation method adopts tea polyphenol as a reducing agent to prepare nano silver, MXene obtained by HCL/LiF stripping is used as a template to fix the nano silver, and the nano silver composite antibacterial agent is prepared; and then mixing the nano-cellulose serving as a film forming substrate and glycerol serving as a plasticizer with the nano-silver composite antibacterial agent to prepare the nano-cellulose/MXene immobilized nano-silver high-barrier antibacterial composite film.
The purpose of the invention is realized by the following technical scheme.
A preparation method of a high-barrier antibacterial composite film based on nano-cellulose/MXene immobilized nano-silver comprises the steps of stripping HCL/LiF to obtain MXene, reducing mixed liquid of MXene and a silver ammonia solution by tea polyphenol to prepare an MXene immobilized nano-silver composite antibacterial agent, and mixing the MXene immobilized nano-silver composite antibacterial agent with glycerol and a nano-cellulose solution to prepare a nano-cellulose-based composite film with high barrier property and antibacterial activity.
The invention provides a preparation method of a high-barrier antibacterial composite film based on nano-cellulose/MXene immobilized nano-silver, which comprises the following steps:
(1) adding the silver ammonia solution into MXene solution (MXene solution obtained by HCL/LiF stripping) under stirring, and uniformly mixing to obtain MXene-silver ammonia mixed solution;
(2) adding a tea polyphenol solution into the MXene-silver ammonia mixed solution obtained in the step (1) at room temperature to obtain a reaction solution, carrying out reduction reaction to obtain an MXene immobilized nano-silver compound, and dialyzing the MXene immobilized nano-silver compound with ultrapure water until no silver ions exist to obtain an MXene immobilized nano-silver compound antibacterial agent;
(3) and (3) adding the MXene immobilized nano-silver composite antibacterial agent obtained in the step (2) into a nano-cellulose solution under the stirring state, adding glycerol, uniformly mixing, pouring into a polytetrafluoroethylene plate for casting to form a film, drying, and uncovering the film to obtain the high-barrier antibacterial composite film based on the nano-cellulose/MXene immobilized nano-silver.
Further, the concentration of the silver ammonia solution in the step (1) is 0.05-5 mol/L.
Further, MXene in the step (1) is Ti3C2TxThe MXeneThe concentration of the solution is 0.1-5 g/L; the volume ratio of the silver ammonia solution to the MXene solution is 1:1-1: 50.
The MXene is MXene with multiple layers or few layers obtained by HCL/LiF stripping.
Further, the concentration of the tea polyphenol solution in the step (2) is 1-50 g/L; the addition amount of the tea polyphenol solution accounts for 5-20% of the volume of the reaction solution; the time of the reduction reaction is 5-60 min.
Further, the mass percentage concentration of the nano-cellulose solution in the step (3) is 0.1-5%; the diameter of the nano-cellulose is less than 15 nm.
Further, the mass of the glycerol in the step (3) is 20-30% of the mass of the nano-cellulose solution.
Further, the mass of the MXene immobilized nano-silver composite antibacterial agent in the step (3) is 0.1-15% of the mass of the nano-cellulose solution.
Further, the drying temperature in the step (3) is 30-60 ℃.
The invention provides a high-barrier antibacterial composite film based on nano-cellulose/MXene immobilized nano-silver prepared by the preparation method, and the oxygen transmission rate of the composite film is 0.04-0.6cm3/m224h 0.1MPa, and the nano silver is uniformly distributed in the film. The high-barrier antibacterial composite film has better antibacterial performance.
The high-barrier antibacterial composite film based on the nano-cellulose/MXene immobilized nano-silver provided by the invention can be applied to food packaging.
The invention uses nano silver as antibacterial agent, has good antibacterial effect and wide range, and solves the problems of weak antibacterial activity and unstable effect of the nano cellulose packaging film; the stripped MXene has a rich lamellar structure, so that metal ions can be fixed on the surface of the MXene nanosheet, and the problem that excessive released silver nanoparticles cause potential harm to human bodies is effectively solved; the MXene immobilized nano silver can form a 3D cross-linked structure with the nano cellulose through the interaction of hydrogen bonds, so that the barrier property and the mechanical property of the composite film are further improved; the composite film has excellent barrier property, unique physical and chemical properties and biological antibacterial activity, and the application of the nano-cellulose in the field of multifunctional food films is expanded.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the preparation method provided by the invention adopts the nano-cellulose, has the advantages of wide source, low cost, safety, no toxicity, degradability and stable performance;
(2) according to the preparation method provided by the invention, the nano-silver particles are fixed by utilizing the confinement effect between MXene two-dimensional layers, and then the nano-silver particles are mixed with the nano-cellulose to prepare the nano-cellulose/MXene/nano-silver composite membrane, wherein the oxygen transmission rate is only 0.04cm3/m224h 0.1MPa, excellent barrier property, and can effectively prevent the problems of reduced food quality and shortened shelf life caused by oxidation; the excellent mechanical property can effectively expand the application of the composite film in food; due to the fixation effect of MXene, a large amount of nano-silver can not be released into food, so that the toxicity of the nano-silver in food application is greatly reduced, and potential harm to human bodies is reduced;
(3) the preparation method provided by the invention has the advantages of simple process, wide raw material source, low energy consumption and the like;
(4) in the nano-cellulose/MXene fixed nano-silver high-barrier antibacterial composite film provided by the invention, the oxygen transmission rate is only 0.04cm3/m224h 0.1MPa, excellent barrier property and good antibacterial effect, and can be applied to food packaging.
Drawings
Fig. 1 is a graph comparing oxygen transmission rates of a pure nanocellulose membrane and a nanocellulose-based composite membrane prepared in example 2.
Fig. 2 is a surface electron microscope image of a pure nano cellulose film and the nano cellulose-based composite film prepared in example 2.
Fig. 3 is a diameter chart of the zone of inhibition of the antibacterial experiment between the pure nano cellulose film and the nano cellulose-based composite film prepared in example 2.
Detailed Description
The technical solution of the present invention is further described in detail below with reference to specific embodiments and drawings, but the embodiments and the protection scope of the present invention are not limited thereto.
Example 1
The preparation method of the nano-cellulose/MXene fixed nano-silver high-barrier antibacterial composite membrane comprises the following specific steps:
(1) using MXene solution obtained by HCL/LiF stripping, adding 1mL of silver ammonia solution with the concentration of 0.05mol/L into 50mL of 0.1g/L MXene solution under stirring, and uniformly mixing to obtain mixed solution;
(2) adding a tea polyphenol solution with the concentration of 1g/L into the mixed solution obtained in the step (1) at room temperature to obtain a reaction solution, wherein the tea polyphenol solution accounts for 5% of the total volume fraction of the reaction solution, continuously reacting for 5min, and dialyzing the obtained MXene immobilized nano-silver compound until no silver ions exist to obtain an MXene immobilized nano-silver compound antibacterial agent;
(3) preparing a nano-cellulose solution with the mass fraction of 0.1% (the diameter of the nano-cellulose is less than 15nm), adding glycerol (a plasticizer) into the nano-cellulose solution under stirring, wherein the mass fraction of the glycerol relative to the nano-cellulose solution is 20%, and obtaining a mixed solution;
(4) and (3) adding an MXene immobilized nano-silver composite antibacterial agent into the mixed solution obtained in the step (3) under stirring, wherein the mass fraction of the MXene immobilized nano-silver composite antibacterial agent relative to the nano-cellulose solution is 0.1%, uniformly mixing, drying at 30 ℃ to form a film, and uncovering the film to obtain the nano-cellulose/MXene immobilized nano-silver high-barrier antibacterial composite film.
Preparing a nano cellulose solution with the mass fraction of 0.1% (the diameter of the nano cellulose is less than 15nm), adding glycerol (serving as a plasticizer) into the nano cellulose solution under stirring, uniformly mixing the glycerol and the nano cellulose solution, carrying out tape casting to form a film, drying, and uncovering the film to obtain the pure nano cellulose film. The pure nanocellulose membrane served as a control group.
Compared with a pure nano cellulose film, the high-barrier antibacterial composite film of nano cellulose/MXene fixed nano silver prepared in example 1 has the advantages that the barrier property of the nano cellulose film is improved due to the addition of the MXene fixed nano silver antibacterial agent, and the structure can be seen in FIG. 1.
In the surface electron microscope image of the nano-cellulose/MXene fixed nano-silver high-barrier antibacterial composite film prepared in example 1, the MXene fixed nano-silver antibacterial agent is uniformly dispersed on the nano-cellulose film, and the nano-cellulose/MXene fixed nano-silver antibacterial agent is uniformly dispersed, and the morphology is regular, which indicates that the attachment stability of the nano-silver particles on the MXene is good, as shown in fig. 2.
The high-barrier antibacterial composite membrane of nano-silver fixed by nano-cellulose/MXene prepared in example 1 has a good antibacterial effect on staphylococcus aureus and escherichia coli, which shows that the composite membrane has antibacterial performance due to the existence of nano-silver, and the pure nano-cellulose membrane does not show an antibacterial effect, as shown in FIG. 3.
Example 2
The preparation method of the nano-cellulose/MXene fixed nano-silver high-barrier antibacterial composite membrane comprises the following specific steps:
(1) obtaining MXene solution by HCL/LiF stripping, adding 7.5mL of silver ammonia solution with the concentration of 0.4mol/L into 50mL of MXene solution with the concentration of 0.9g/L under stirring, and uniformly mixing to obtain mixed solution;
(2) adding a tea polyphenol solution with the concentration of 10g/L into the mixed solution obtained in the step (1) at room temperature to obtain a reaction solution, wherein the tea polyphenol solution accounts for 7.5% of the total volume fraction of the reaction solution, continuously reacting for 30min, and dialyzing the obtained MXene immobilized nano-silver compound until no silver ion is detected to obtain a nano-cellulose immobilized nano-silver compound antibacterial agent;
(3) preparing a nano-cellulose solution with the mass fraction of 2% (the diameter of the nano-cellulose is less than 15nm), adding 25% of glycerol (plasticizer) into the nano-cellulose solution under stirring, wherein the mass fraction of the glycerol relative to the nano-cellulose solution is 25%, and obtaining a mixed solution;
(4) and (3) adding the MXene immobilized nano-silver composite antibacterial agent into the mixed solution obtained in the step (3) under stirring, uniformly mixing, drying at 45 ℃ to form a film, and uncovering the film to obtain the high-barrier antibacterial composite film of the nano-cellulose/MXene immobilized nano-silver, wherein the mass fraction of the MXene immobilized nano-silver composite antibacterial agent relative to the nano-cellulose solution is 5%.
Preparing a nano cellulose solution with the mass fraction of 0.1% (the diameter of the nano cellulose is less than 15nm), adding glycerol (serving as a plasticizer) as the plasticizer into the nano cellulose solution under stirring, uniformly mixing the glycerol and the nano cellulose, carrying out tape casting to form a film, drying, and uncovering the film to obtain the pure nano cellulose film. The pure nanocellulose membrane served as a control group.
The oxygen transmission rate of the high-barrier antibacterial composite membrane with nano silver fixed by nano cellulose/MXene is shown in figure 1. As can be seen from FIG. 1, compared with the pure nano cellulose film, the oxygen transmission rate of the nano silver composite film fixed by nano cellulose/MXene is only 0.04cm3/m224 h.0.1 MPa, which shows that the addition of MXene fixed nano-silver antibacterial agent improves the barrier property of the nano-cellulose film. The nanocellulose-based composite membrane in fig. 1, 2 and 3 is represented as a high-barrier antibacterial composite membrane with nano-silver fixed by nano-cellulose/MXene.
The surface electron microscope image of the prepared high-barrier antibacterial composite membrane with nano-silver fixed by nano-cellulose/MXene is shown in FIG. 2. As can be seen from FIG. 2, the prepared MXene-immobilized nano-silver antibacterial agent is uniformly dispersed on the nano-cellulose membrane, and is uniform in dispersion and regular in morphology, which shows that the adhesion stability of the nano-silver particles on the MXene is good.
The diameter data of the experimental inhibition zone of the high-barrier antibacterial composite membrane with nano-silver fixed by nano-cellulose/MXene for the antibacterial action of staphylococcus aureus and escherichia coli is shown in fig. 3. As can be seen from FIG. 3, the nano-cellulose/MXene fixed nano-silver composite membrane has a good antibacterial effect on staphylococcus aureus and escherichia coli, which shows that the composite membrane has antibacterial performance due to the existence of nano-silver. Whereas pure nanocellulose membranes showed no antibacterial effect.
Example 3
The preparation method of the nano-cellulose/MXene fixed nano-silver high-barrier antibacterial composite membrane comprises the following specific steps:
(1) obtaining MXene solution by HCL/LiF stripping, adding 30mL of silver ammonia solution with the concentration of 2.5mol/L into 50mL of 2g/L MXene solution under stirring, and uniformly mixing to obtain mixed solution;
(2) adding a tea polyphenol solution with the concentration of 30g/L into the mixed solution obtained in the step (1) at room temperature to obtain a reaction solution, wherein the tea polyphenol solution accounts for 12% of the total volume fraction of the reaction solution, continuously reacting for 45min, and dialyzing the obtained MXene immobilized nano-silver compound until no silver ion is detected to obtain an MXene immobilized nano-silver compound antibacterial agent;
(3) preparing a nano-cellulose solution with the mass fraction of 4% (the diameter of the nano-cellulose is less than 15nm), adding glycerol (plasticizer) into the nano-cellulose solution under stirring, wherein the mass fraction of the glycerol relative to the nano-cellulose solution is 28%, and obtaining a mixed solution;
(4) and (3) adding an MXene immobilized nano-silver composite antibacterial agent into the mixed solution obtained in the step (3) under stirring, wherein the mass fraction of the MXene immobilized nano-silver composite antibacterial agent relative to the nano-cellulose is 10%, uniformly mixing, drying at 50 ℃ to form a film, and uncovering the film to obtain the nano-cellulose/MXene immobilized nano-silver high-barrier antibacterial composite film.
Preparing a nano cellulose solution with the mass fraction of 0.1% (the diameter of the nano cellulose is less than 15nm), adding glycerol (serving as a plasticizer) into the nano cellulose solution under stirring, uniformly mixing the glycerol and the nano cellulose solution, carrying out tape casting to form a film, drying, and uncovering the film to obtain the pure nano cellulose film. The pure nanocellulose membrane served as a control group.
Compared with a pure nano cellulose film, the high-barrier antibacterial composite film of nano cellulose/MXene fixed nano silver prepared in example 3 has improved barrier property of the nano cellulose film due to the addition of the MXene fixed nano silver antibacterial agent, as shown in FIG. 1.
In the surface electron microscope image of the high-barrier antibacterial composite membrane of nanocellulose/MXene immobilized nanosilver prepared in example 3, the MXene immobilized nanosilver antibacterial agent is uniformly dispersed on the nanocellulose membrane, and is uniformly dispersed, and the morphology is regular, which indicates that the adhesion stability of the nanosilver particles on the MXene is good, as shown in fig. 2.
The high-barrier antibacterial composite membrane of nano-silver fixed by nano-cellulose/MXene prepared in example 3 has a good antibacterial effect on staphylococcus aureus and escherichia coli, which shows that the composite membrane has antibacterial performance due to the existence of nano-silver, and the pure nano-cellulose membrane does not show antibacterial effect, as shown in FIG. 3.
Example 4
The preparation method of the nano-cellulose/MXene fixed nano-silver high-barrier antibacterial composite membrane comprises the following specific steps:
(1) obtaining MXene solution by HCL/LiF stripping, adding 50mL of 5mol/L silver ammonia solution into 50mL of 5g/L MXene solution under stirring, and uniformly mixing to obtain mixed solution;
(2) adding a tea polyphenol solution with the concentration of 50g/L into the mixed solution obtained in the step (1) at room temperature to obtain a reaction solution, wherein the tea polyphenol solution accounts for 20% of the total volume fraction of the reaction solution, continuously reacting for 60min, and dialyzing the obtained MXene immobilized nano-silver compound until no silver ion is detected to obtain an MXene immobilized nano-silver compound antibacterial agent;
(3) preparing a nano-cellulose solution with the mass fraction of 5% (the diameter of the nano-cellulose is less than 15nm), adding glycerol (a plasticizer) into the nano-cellulose solution under stirring, wherein the mass fraction of the glycerol relative to the nano-cellulose solution is 30%, and obtaining a mixed solution;
(4) and (3) adding an MXene immobilized nano-silver composite antibacterial agent into the mixed solution obtained in the step (3) under stirring, wherein the mass fraction of the MXene immobilized nano-silver composite antibacterial agent relative to the nano-cellulose solution is 15%, uniformly mixing, drying at 60 ℃ to form a film, and uncovering the film to obtain the oxidized nano-cellulose/MXene immobilized nano-silver high-barrier antibacterial composite film.
Preparing a nano cellulose solution with the mass fraction of 0.1% (the diameter of the nano cellulose is less than 15nm), adding glycerol (serving as a plasticizer) into the nano cellulose solution under stirring, uniformly mixing the glycerol and the nano cellulose solution, carrying out tape casting to form a film, drying, and uncovering the film to obtain the pure nano cellulose film. The pure nanocellulose membrane served as a control group.
Compared with a pure nano cellulose film, the high-barrier antibacterial composite film of nano cellulose/MXene fixed nano silver prepared in example 4 has improved barrier property due to the addition of the MXene fixed nano silver antibacterial agent, as shown in FIG. 1.
In the surface electron microscope image of the high-barrier antibacterial composite membrane of nanocellulose/MXene immobilized nanosilver prepared in example 4, the MXene immobilized nanosilver antibacterial agent is uniformly dispersed on the nanocellulose membrane, and is uniformly dispersed, and the morphology is regular, which indicates that the adhesion stability of the nanosilver particles on the MXene is good, as shown in fig. 2.
The high-barrier antibacterial composite membrane of nano-silver fixed by nano-cellulose/MXene prepared in example 4 has a good antibacterial effect on staphylococcus aureus and escherichia coli, which shows that the composite membrane has antibacterial performance due to the existence of nano-silver, and the pure nano-cellulose membrane does not show antibacterial effect, as shown in FIG. 3.
The above examples are only the preferred embodiments of the present invention, and all have good barrier properties and antibacterial properties. The present invention is described in detail, but the invention is not limited thereto, and those skilled in the art should understand that they can make various changes, substitutions and alterations herein without departing from the spirit and scope of the invention.
Claims (10)
1. A preparation method of a high-barrier antibacterial composite film based on nano-cellulose/MXene immobilized nano-silver is characterized by comprising the following steps:
(1) adding the silver ammonia solution into the MXene solution under the stirring state, and uniformly mixing to obtain an MXene-silver ammonia mixed solution;
(2) adding a tea polyphenol solution into the MXene-silver ammonia mixed solution obtained in the step (1) to obtain a reaction solution, carrying out reduction reaction to obtain an MXene immobilized nano-silver compound, and dialyzing the MXene immobilized nano-silver compound with ultrapure water until no silver ions exist to obtain an MXene immobilized nano-silver compound antibacterial agent;
(3) and (3) adding the MXene immobilized nano-silver composite antibacterial agent obtained in the step (2) into a nano-cellulose solution under the stirring state, adding glycerol, uniformly mixing, carrying out tape casting to form a film, drying, and uncovering the film to obtain the high-barrier antibacterial composite film based on the nano-cellulose/MXene immobilized nano-silver.
2. The preparation method of the high-barrier antibacterial composite membrane based on nanocellulose/MXene immobilized nanosilver according to claim 1, wherein the concentration of the silver ammonia solution in step (1) is 0.05-5 mol/L.
3. The preparation method of the high-barrier antibacterial composite film based on nano-cellulose/MXene immobilized nano-silver according to claim 1, wherein the MXene in the step (1) is Ti3C2TxThe concentration of the MXene solution is 0.1-5 g/L; the volume ratio of the silver ammonia solution to the MXene solution is 1:1-1: 50.
4. The preparation method of the high-barrier antibacterial composite membrane based on nanocellulose/MXene immobilized nanosilver according to claim 1, wherein the concentration of the tea polyphenol solution in step (2) is 1-50 g/L; the addition amount of the tea polyphenol solution accounts for 5-20% of the volume of the reaction solution; the time of the reduction reaction is 5-60 min.
5. The preparation method of the high-barrier antibacterial composite membrane based on nano-cellulose/MXene immobilized nano-silver according to claim 1, wherein the mass percentage concentration of the nano-cellulose solution in the step (3) is 0.1-5%; the diameter of the nano-cellulose is less than 15 nm.
6. The preparation method of the high-barrier antibacterial composite membrane based on nano-cellulose/MXene immobilized nano-silver according to claim 1, wherein the mass of the glycerol in the step (3) is 20-30% of the mass of the nano-cellulose solution.
7. The preparation method of the high-barrier antibacterial composite membrane based on nano-cellulose/MXene immobilized nano-silver according to claim 1, wherein the mass of the MXene immobilized nano-silver composite antibacterial agent in the step (3) is 0.1-15% of the mass of the nano-cellulose solution.
8. The preparation method of the high-barrier antibacterial composite membrane based on nano-cellulose/MXene immobilized nano-silver according to claim 1, wherein the drying temperature in the step (3) is 30-60 ℃.
9. The high-barrier antibacterial composite membrane based on nano-cellulose/MXene immobilized nano-silver prepared by the preparation method of any one of claims 1 to 8, and characterized by oxygen transmission rate of 0.04-0.6cm3/m224h 0.1MPa, and the nano silver is uniformly distributed in the film.
10. The application of the high-barrier antibacterial composite film based on nano-cellulose/MXene immobilized nano-silver in food packaging according to claim 9.
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| CN115068673A (en) * | 2022-06-30 | 2022-09-20 | 吉林大学 | Preparation method and application of MXene-based autocatalytic conductive hydrogel dressing |
| CN115068673B (en) * | 2022-06-30 | 2023-06-06 | 吉林大学 | Preparation method and application of MXene-based self-catalyzed conductive hydrogel dressing |
| CN115380916A (en) * | 2022-08-15 | 2022-11-25 | 四川大学华西医院 | Sprayable nano antibacterial aqueous solution spray and preparation method thereof |
| CN115380916B (en) * | 2022-08-15 | 2023-05-26 | 四川大学华西医院 | Spray-type nano antibacterial aqueous solution spray and preparation method thereof |
| CN115558152A (en) * | 2022-10-14 | 2023-01-03 | 南京农业大学 | Dual-drying degradable nano-cellulose composite antibacterial aerogel and preparation method and application thereof |
| CN115559109A (en) * | 2022-11-18 | 2023-01-03 | 四川大学华西医院 | Breathable antibacterial nano composite fiber material and preparation method and application thereof |
| CN115926257A (en) * | 2023-01-04 | 2023-04-07 | 齐鲁工业大学(山东省科学院) | Preparation method and application of silver-loaded TEMPO oxidized nano-cellulose/chitosan antibacterial preservative film for fruit and vegetable packaging |
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