CN112210090A - Mxene-polyacrylic acid composite hydrogel and preparation method thereof - Google Patents
Mxene-polyacrylic acid composite hydrogel and preparation method thereof Download PDFInfo
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
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- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
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Abstract
The invention provides an Mxene-polyacrylic acid composite hydrogel and a preparation method thereof. And the reagents or raw materials adopted by the invention are nontoxic and pollution-free, and the obtained hydrogel is an environment-friendly material. The whole method has simple process and convenient operation, and is suitable for batch production. The Mxene-polyacrylic acid composite hydrogel contains a surface modified Mxene material, so that the Mxene-polyacrylic acid composite hydrogel has excellent mechanical property and adsorption capacity and stronger biocompatibility, and the application range of the Mxene-polyacrylic acid composite hydrogel is wider.
Description
Technical Field
The application relates to the technical field of water-absorbent polymer hydrogel, in particular to Mxene-polyacrylic acid composite hydrogel and a preparation method thereof.
Background
The cross-linked polymer hydrogel is a water swelling type functional polymer water absorbing material formed by mutual cross-linking through the actions of covalent bonds, hydrogen bonds, van der waals force and the like, has a three-dimensional network structure, contains a large number of hydrophilic groups (hydroxyl, carboxyl and the like) on a main chain or a side chain skeleton, can be combined with a part of water after swelling to form the hydrogen bonds, has certain hydrophilicity, and can absorb water or aqueous solution with the mass which is dozens to hundreds of times or even thousands of times of that of the hydrogel. Meanwhile, the biodegradable polyester film has good swelling property, biocompatibility, nontoxicity, easy recoverability and degradability. The excellent properties of hydrogels have been and are also attracting much interest, resulting in long-term development of their research and development, production and sale. After decades of development, large companies in developed countries such as the U.S. and japan and germany have succeeded in developing various commercially available super absorbent polymers.
The polyacrylic acid hydrogel is a three-dimensional cross-linked hydrophilic polymer network structure with high water content, is soft in property, can keep a certain shape in water and is insoluble, and meanwhile, is a polymer with better water absorption performance. The high water absorption polyacrylic acid hydrogel has application in medical wound dressing, drug release carrier, water and soil humectant, cosmetics and other aspects, and has become a functional polymer material with high commercial value. Due to the presence of the crosslinked structure, the polyacrylic acid hydrogel can be sufficiently swollen in water without being dissolved. In recent years, the application field of hydrogel is increasingly expanded, and the hydrogel is developed in the fields of adsorption, catalysis, water absorption, tissue engineering, drug carriers, wastewater treatment, chemical sensors and the like. However, the application range of polyacrylic acid hydrogels also suffers from severe limitations due to poor mechanical properties. This also provides the buried pen with other measures to enhance the water absorption and mechanical properties of the traditional hydrogel materials.
Research finds that the introduction of micro/nano fillers into a polymer network is an effective way for preparing the high water absorption composite hydrogel material. Mxene is an emerging two-dimensional material with excellent biocompatibility, ion intercalation ability and hydrophilicity. However, the application of Mxene to composite hydrogel materials generally faces the problems of complex process, high cost and the like, and therefore, there is a need to provide a method capable of realizing the application of Mxene in the preparation of composite hydrogel materials on the basis of low cost.
Disclosure of Invention
Aiming at the problems and defects in the prior art, the invention provides an Mxene-polyacrylic acid composite hydrogel and a preparation method thereof. The method of the invention adopts the surface modifier with low cost to carry out surface treatment on the etched MXene material, thus obtaining the MXene material with high stability and high dispersibility in the polymer. The composite hydrogel containing the modified Mxene material has stronger adsorption capacity and biocompatibility, and the mechanical strength of the composite hydrogel is greatly improved. And the Mxene material in the composite hydrogel has no phenomena of precipitation, flocculation and the like.
According to a first aspect of the present invention, there is provided a Mxene-polyacrylic acid composite hydrogel comprising polyacrylic acid and a two-dimensional Mxene material,
in the Mxene-polyacrylic acid composite hydrogel, the two-dimensional Mxene material is uniformly dispersed in the polyacrylic acid as a polymer reinforcement.
Optionally, the two-dimensional Mxene material is a two-dimensional Mxene material surface-modified with cetyltrimethylammonium bromide.
Optionally, the two-dimensional Mxene material is two-dimensional layered Ti3C2。
The invention also provides a preparation method of the Mxene-polyacrylic acid composite hydrogel, which comprises the following steps:
preparation of a homogeneous solution of Mxene: adding a surface modifier into the solution in which the two-dimensional Mxene material is dispersed, and performing ultrasonic dispersion to form an Mxene uniform solution;
preparation of mixed Mxene/acrylic solution: adding an acrylic monomer into the Mxene uniform solution, and stirring until the mixture is uniformly mixed;
preparing a composite hydrogel: and adding a cross-linking agent and an initiator into the Mxene/acrylic acid mixed solution, and keeping the temperature at the polymerization temperature until the polymerization reaction is complete.
Optionally, the two-dimensional Mxene material is obtained by:
providing a MAX material, wherein the MAX material is Ti3AlC2；
Adding the Ti3AlC2Selectively etching in hydrofluoric acid solution to obtain two-dimensional layered Ti3C2。
Optionally, preparing the Mxene homogeneous solution further comprises the steps of:
weighing the surface modifier and the two-dimensional Mxene material according to the mass ratio of the surface modifier to the Mxene of 2: 1;
the two-dimensional Mxene material was ultrasonically dispersed in deionized water.
Optionally, the surface modifier is cetyltrimethylammonium bromide.
Optionally, in the mixed solution of Mxene and acrylic acid, the mass percentage of the two-dimensional Mxene material is 0.01-1%.
Optionally, preparing the composite hydrogel further comprises the steps of:
weighing the cross-linking agent in an amount of 0.1-0.5% by mass of the acrylic monomer;
weighing the initiator according to the mass ratio of 5:1 of the initiator to the cross-linking agent;
adding the cross-linking agent into the Mxene/acrylic acid mixed solution, keeping rapid stirring and heating to 40-50 ℃ to form a reaction system;
and adding the initiator into the reaction system, heating to a polymerization temperature of 60-80 ℃, and keeping the temperature at the polymerization temperature for 1-3 hours.
Alternatively, the crosslinker is N, N-methylenebisacrylamide and the initiator is potassium persulfate.
As described above, the Mxene-polyacrylic acid composite hydrogel and the preparation method thereof of the present invention have at least the following advantageous effects:
the Mxene-polyacrylic acid composite hydrogel contains a surface modified Mxene material, so that the Mxene-polyacrylic acid composite hydrogel has excellent mechanical property and adsorption capacity and stronger biocompatibility, and the application range of the Mxene-polyacrylic acid composite hydrogel is wider.
When the Mxene-polyacrylic acid composite hydrogel is prepared, the surface of the Mxene material is modified, the homoionic effect of the Mxene material and an acrylic monomer is eliminated, the Mxene can be stably dispersed in the hydrogel, and the mechanical property and the adsorption property of the hydrogel are enhanced. The invention adopts the surface modifier (such as cetyl trimethyl ammonium bromide) which is easy to obtain and low in cost to carry out surface modification on the Mxene material, thereby reducing the cost of the whole method. And the reagents or raw materials adopted by the invention are nontoxic and pollution-free, and the obtained hydrogel is an environment-friendly material. The whole method has simple process and convenient operation, and is suitable for batch production.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
FIG. 1 shows a schematic flow chart of a preparation method of the Mxene-polyacrylic acid composite hydrogel provided by the invention.
FIG. 2 shows a schematic of an Mxene-polyacrylic acid composite hydrogel prepared as illustrative one of the present inventions.
FIG. 3 shows a schematic representation of an Mxene-polyacrylic acid composite hydrogel prepared according to example two of the present invention.
FIG. 4 shows a Mapping chart of an Mxene-polyacrylic acid composite hydrogel prepared according to example two of the present invention.
FIG. 5 shows the FTIR spectrum of Mxene-polyacrylic acid composite hydrogel prepared according to example two of the present invention.
FIG. 6 shows a schematic of an example three-prepared Mxene-polyacrylic acid composite hydrogel of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Scientific research finds that the introduction of the micro/nano filler into the polymer network is an effective way for preparing the high water-absorption composite hydrogel material. Mxene is an emerging two-dimensional material with excellent biocompatibility, ion intercalation ability and hydrophilicity. Since hydrofluoric acid (HF) and ammonium bifluoride (NH) can be used4HF2) Or a mixture of hydrochloric acid (HCl) and lithium fluoride (LiF) to etch the MAX material to form the Mxene material, in Mn+1XnThe outer layer of the structure (n is more than or equal to 1) is provided with the dangling bonds which are easily combined with-OH and/or-F groups in the solution, and the geometrical groups can be well dispersed in the aqueous solution to form a compound with the hydrogel, so that the novel nano-composite hydrogel material with high performance is obtained, and the water absorption performance and the mechanical property of the hydrogel are improved. The above process also demonstrates that weak acids like acrylic acid do not affect the performance of Mxene, and that Mxene materials can be used in the preparation of acrylic hydrogels.
However, both acrylic acid and Mxene have hydroxyl groups, and Mxene precipitates and flocculates from an acrylic acid solution due to the homoionic effect, and thus a uniform solution cannot be formed. This requires surface modification of the Mxene to improve its stability and dispersibility in various environments. For example, Mxene surfaces can be modified by in situ growth of TiO2 nanoparticles on the Mxene surface, or by expensive Pluronic F127. However, the surface modification process is usually complicated or extremely high in cost, and the application and popularization of the Mxene/polyacrylic acid composite hydrogel are limited.
Based on the defects, the invention provides a preparation method of Mxene-polyacrylic acid composite hydrogel, which adopts a low-cost surface modifier to carry out surface modification on Mxene so that the Mxene is uniformly dispersed in an acrylic acid solution, and the Mxene/polyacrylic acid composite hydrogel with high water absorption performance is formed through in-situ polymerization reaction. The whole preparation method has the advantages of low cost, no toxicity, simple process and convenient operation, and is suitable for batch production. As shown in FIG. 1, the preparation method of the Mxene-polyacrylic acid composite hydrogel comprises the following steps:
s100: preparation of a homogeneous solution of Mxene: adding a surface modifier into the solution in which the two-dimensional Mxene material is dispersed, and performing ultrasonic dispersion to form an Mxene uniform solution;
firstly, ultrasonically dispersing the obtained two-dimensional Mxene material in deionized water to form a solution in which the two-dimensional Mxene material is dispersed, then adding a proper amount of surface modifier into the solution, and ultrasonically dispersing the mixture to form a uniform solution.
In this embodiment, the two-dimensional Mxene material is obtained by etching a MAX material. Optionally, the MAX material is Ti3AlC2Is prepared from Ti3AlC2Put into hydrofluoric acid solution, in hydrofluoric acid solution, Ti3AlC2The Al layer in the titanium alloy is dissolved by hydrofluoric acid to obtain two-dimensional layered Ti3C2. In this example, cetyl trimethylammonium bromide, which is inexpensive and readily available, was selected as the surface modifier. Firstly, weighing the required two-dimensional Mxene, namely two-dimensional layered Ti according to the mass percent of the two-dimensional Mxene material of 0.01-1 per mill of the subsequently formed Mxene/acrylic acid mixed solution3C2。
Ti in two-dimensional layered form3C2Ultrasonically dispersed in a quantity of deionized water to form a solution, typically Ti in alternative embodiments3C2Weighing two-dimensional layered Ti with the concentration of 1-5 mg/ml3C2And measuring deionized water. And then adding a surface modifier into the solution, wherein in the embodiment, cetyl trimethyl ammonium bromide which is easy to obtain and low in cost is selected as the surface modifier. Weighing the surface modifier, namely hexadecyl trimethyl ammonium bromide according to the mass ratio of the surface modifier to Mxene of 2: 1. Cetyl trimethyl ammonium bromide is added into Ti dispersed with two-dimensional lamellar3C2In solution ofStirring and ultrasonic dispersing at room temperature (e.g. 25-35 ℃) for about 30min to form a uniform solution. Finishing the two-dimensional layered Ti of hexadecyl trimethyl ammonium bromide in the ultrasonic dispersion process3C2Surface modification of (2), surface-modified Ti3C2Hydrophilic group is formed on the surface, and Ti is improved3C2By interfacial interaction with acrylic acid, Ti3C2Has good compatibility, and can not precipitate and flocculate in acrylic acid.
S200: preparation of mixed Mxene/acrylic solution: adding an acrylic monomer into the Mxene uniform solution, and stirring until the mixture is uniformly mixed;
first, the acrylic acid monomer is weighed, and the mass of the acrylic acid monomer can be determined according to the amount of hydrogel to be formed. And adding an acrylic monomer into the Mxene homogeneous solution prepared in the step S100, and stirring at room temperature (for example, 25-35 ℃) to ensure that the acrylic monomer is uniformly mixed in the Mxene homogeneous solution.
S300: preparing a composite hydrogel: adding a cross-linking agent and an initiator into the Mxene/acrylic acid mixed solution, and keeping the temperature at the polymerization temperature until the polymerization reaction is complete;
firstly, weighing a cross-linking agent according to 0.1-0.5% of the mass of an acrylic monomer. In this example, N-methylenebisacrylamide was selected as the crosslinking agent.
Then, the initiator is weighed according to the mass ratio of 5:1 of the initiator to the cross-linking agent, and in the embodiment, potassium persulfate is selected as the initiator.
And then, firstly, adding a cross-linking agent into the Mxene/acrylic acid mixed solution prepared in the step S200, keeping rapid stirring (the stirring speed is 600-800 r/min), heating to 40-50 ℃, and ensuring that the cross-linking agent is uniformly dispersed in the Mxene/acrylic acid mixed solution to form a reaction system.
And adding an initiator into the reaction system, continuously heating to a polymerization temperature, wherein the polymerization temperature of acrylic acid is about 60-80 ℃, and keeping the temperature at the polymerization temperature for 1-3 hours, so that the acrylic acid monomer is subjected to in-situ polymerization reaction, and the polymerization reaction is ensured to be complete, thereby obtaining the Mxene-polyacrylic acid hydrogel.
As mentioned above, the invention adopts cetyl trimethyl ammonium bromide as the surface modifier, and the surface modifier is easy to obtain and has low cost, thereby greatly reducing the cost of Mxene surface modification and further reducing the cost of the whole process method. The surface-modified Mxene is uniformly dispersed in an acrylic polymer, so that the Mxene-polyacrylic acid composite hydrogel is formed, the composite hydrogel has excellent mechanical property and adsorption capacity, and has stronger biocompatibility, and the application range of the Mxene-polyacrylic acid composite hydrogel is wider.
In order to further observe and test the properties of the composite hydrogel obtained by the method of this example, this example separately prepares composite hydrogels by the following specific examples:
example 1
1) Weighing 1.44mg of two-dimensional layered Ti3C2Is prepared from Ti3C2Ultrasonically dispersing in 40ml deionized water, adding 2.88mg hexadecyl trimethyl ammonium bromide, and ultrasonically dispersing to form a uniform solution to finish the preparation of the Ti3C2Surface modification of (2);
2) modified Ti3C2Adding 14.4g of acrylic acid monomer into the uniform solution, and stirring at room temperature (28 ℃) to ensure that the acrylic acid monomer is uniformly mixed;
3) adding 14.4mg of cross-linking agent N, N-methylene bisacrylamide into the mixed solution, keeping stirring rapidly (the stirring speed is about 600r/min), then rapidly adding 160mg of initiator potassium persulfate into the reaction system, continuously heating to the polymerization temperature of 60 ℃, and keeping the temperature constant for 2.5 hours to complete the in-situ polymerization reaction of the acrylic monomer, thereby obtaining the Mxene-polyacrylic acid composite hydrogel. As shown in fig. 2, a schematic view of the composite hydrogel 01 obtained in this example 1 is shown.
Example 2
1) Weighing 7.2mg of two-dimensional layered Ti3C2Is prepared from Ti3C2Ultrasonically dispersing in 20ml deionized water, adding 14.4mg hexadecyl trimethyl ammonium bromide, and ultrasonically dispersing to form a uniform solution to finish the preparation of Ti3C2Surface modification of (2);
2) modified Ti3C2Adding 14.4g of acrylic acid monomer into the uniform solution, and stirring at room temperature (30 ℃) to ensure that the acrylic acid monomer is uniformly mixed;
3) adding 32mg of cross-linking agent N, N-methylene bisacrylamide into the mixed solution, keeping rapid stirring (the stirring speed is about 750r/min), then rapidly adding 160mg of initiator potassium persulfate into the reaction system, heating to the polymerization temperature of 70 ℃, and keeping the temperature constant for 3 hours to complete the in-situ polymerization reaction of the acrylic monomer, thereby obtaining the Mxene-polyacrylic acid composite hydrogel. As shown in fig. 3, a schematic view of the composite hydrogel 02 obtained in this example 2 is shown.
Example 3
1) 14.4mg of two-dimensional layered Ti was weighed3C2Is prepared from Ti3C2Ultrasonically dispersing in 40ml deionized water, adding 28.8 mg hexadecyl trimethyl ammonium bromide, and ultrasonically dispersing to form a uniform solution to finish the preparation of the Ti3C2Surface modification of (2);
2) modified Ti3C2Adding 14.4g of acrylic acid monomer into the uniform solution, and stirring at room temperature (25 ℃) to ensure that the acrylic acid monomer is uniformly mixed;
3) adding 32mg of cross-linking agent N, N-methylene bisacrylamide into the mixed solution, keeping stirring rapidly (the stirring speed is about 800r/min), then rapidly adding 160mg of initiator potassium persulfate into the reaction system, continuously heating to the polymerization temperature of 70 ℃, and keeping the temperature constant for 3 hours to complete the in-situ polymerization reaction of the acrylic monomer, thereby obtaining the Mxene-polyacrylic acid composite hydrogel. As shown in fig. 4, a schematic view of the composite hydrogel 03 obtained in this example 3 is shown.
The composite hydrogels obtained in examples 1 to 3 shown in FIGS. 2 to 4 were compared to compare the appearance characteristics of the composite hydrogels. Meanwhile, in order to further evaluate the mechanical properties and swelling properties of the composite hydrogels, tensile tests and swelling property tests were performed on the composite hydrogels shown in fig. 2 to 4, respectively. The performance characteristics of the composite hydrogel are shown in table 1 below.
TABLE 1 characteristics of the composite hydrogels obtained in the different examples
As can be seen from fig. 2 to 4 and table 1 above, the composite hydrogels of examples 1 to 3 obtained by the method of the present invention all have good appearance characteristics, mechanical properties and swelling properties. And the mechanical properties and swellability of the composite hydrogel of example 2 are particularly outstanding in the case where the appearance characteristics of the composite hydrogel are not different or are not very different, for example, the elongation at break is as high as 142%, and the swelling water absorption capacity is as high as 283 g/g. In order to further analyze and study the properties of the composite hydrogel of example 2, the composite hydrogel of example 2 was subjected to elemental analysis and infrared spectroscopic analysis, respectively, to obtain Mapping graphs and infrared absorption spectra of the composite hydrogel shown in fig. 5 and 6, respectively.
Mapping images of the composite hydrogel can be obtained using a TEM (transmission electron microscope) or SEM (scanning electron microscope). In this embodiment, scanning is performed on the composite hydrogel by using an SEM to obtain a Mapping chart shown in fig. 5, and the weight percentages and atomic percentages of the elements obtained by analyzing the elements in fig. 5 are shown in table 2 below:
table 2 weight percent and atomic percent of each element in the composite hydrogel of example 2
| Element(s) | C | N | O | Ti |
| Weight percent of | 52.92 | 0.12 | 44.98 | 0.70 |
| Atomic percent | 60.46 | 0.12 | 38.58 | 0.20 |
In fig. 5, the Au element is a plating layer on the surface of the sample when SEM scanning is performed, and therefore, no analysis is performed.
As is clear from Table 2 above and FIG. 5, the composite hydrogel formed in example 2 contains Ti3C2And Ti3C2Uniformly distributed in the hydrogel, and proves that Ti is successfully introduced into the hydrogel3C2。
FIG. 6 shows the infrared spectrum analysis of the composite hydrogel, with a scanning range of 500-4000 cm-1From this, 3447cm-1Is a symmetric stretching vibration characteristic peak of-OH, 2974cm-1is-CH2Absorption Peak, 2361cm-1Is CO2Absorption Peak, 1654cm-1Is a C-O-H absorption peak at 1458cm-1The C-H absorption peak indicates that the Mxene-polyacrylic acid hydrogel is successfully formed by acrylic acid after polymerization.
As described above, the Mxene-polyacrylic acid composite hydrogel and the preparation method thereof of the present invention have at least the following advantageous effects:
the Mxene-polyacrylic acid composite hydrogel contains a surface modified Mxene material, so that the Mxene-polyacrylic acid composite hydrogel has excellent mechanical property and adsorption capacity and stronger biocompatibility, and the application range of the Mxene-polyacrylic acid composite hydrogel is wider.
When the Mxene-polyacrylic acid composite hydrogel is prepared, the surface of the Mxene material is modified, the homoionic effect of the Mxene material and an acrylic monomer is eliminated, the Mxene can be stably dispersed in the hydrogel, and the mechanical property and the adsorption property of the hydrogel are enhanced. The invention adopts the surface modifier (such as cetyl trimethyl ammonium bromide) which is easy to obtain and low in cost to carry out surface modification on the Mxene material, thereby reducing the cost of the whole method. And the reagents or raw materials adopted by the invention are nontoxic and pollution-free, and the obtained hydrogel is an environment-friendly material. The whole method has simple process and convenient operation, and is suitable for batch production.
The above-described embodiments are merely illustrative of the principles of the present invention and its efficacy, rather than limiting the same, and those skilled in the art will be able to make various modifications and variations without departing from the spirit and scope of the invention, which fall within the scope of the appended claims.
Claims (10)
1. An Mxene-polyacrylic acid composite hydrogel is characterized by comprising polyacrylic acid and a two-dimensional Mxene material,
in the Mxene-polyacrylic acid composite hydrogel, the two-dimensional Mxene material is uniformly dispersed in the polyacrylic acid as a polymer reinforcement.
2. The Mxene-polyacrylic acid composite hydrogel according to claim 1, characterized in that the two-dimensional Mxene material is a two-dimensional Mxene material surface-modified with cetyltrimethylammonium bromide.
3. The MXene-polyacrylic acid composite hydrogel of claim 1 or 2, wherein the two-dimensional Mxene material is two-dimensional layered Ti3C2。
4. A preparation method of Mxene-polyacrylic acid composite hydrogel is characterized by comprising the following steps:
preparation of a homogeneous solution of Mxene: adding a surface modifier into the solution in which the two-dimensional Mxene material is dispersed, and performing ultrasonic dispersion to form an Mxene uniform solution;
preparation of mixed Mxene/acrylic solution: adding an acrylic monomer into the Mxene uniform solution, and stirring until the mixture is uniformly mixed;
preparing a composite hydrogel: and adding a cross-linking agent and an initiator into the Mxene/acrylic acid mixed solution, and keeping the temperature at the polymerization temperature until the polymerization reaction is complete.
5. The method of claim 4, wherein the two-dimensional Mxene material is obtained by the following steps:
providing a MAX material, wherein the MAX material is Ti3AlC2；
Adding the Ti3AlC2Selectively etching in hydrofluoric acid solution to obtain two-dimensional layered Ti3C2。
6. The method of claim 4 or 5, wherein the step of preparing the homogeneous solution of Mxene further comprises the steps of:
weighing the surface modifier and the two-dimensional Mxene material according to the mass ratio of the surface modifier to the Mxene of 2: 1;
the two-dimensional Mxene material was ultrasonically dispersed in deionized water.
7. The method of claim 4, wherein the surface modifier is cetyltrimethylammonium bromide.
8. The production method according to claim 4 or 5, wherein the mass percentage of the two-dimensional Mxene material in the Mxene/acrylic acid mixed solution is 0.01-1%.
9. The method of claim 4, wherein the step of preparing the composite hydrogel further comprises the steps of:
weighing the cross-linking agent in an amount of 0.1-0.5% by mass of the acrylic monomer;
weighing the initiator according to the mass ratio of 5:1 of the initiator to the cross-linking agent;
adding the cross-linking agent into the Mxene/acrylic acid mixed solution, keeping rapid stirring and heating to 40-50 ℃ to form a reaction system;
and adding the initiator into the reaction system, heating to a polymerization temperature of 60-80 ℃, and keeping the temperature at the polymerization temperature for 1-3 hours.
10. The production method according to claim 4 or 9, wherein the crosslinking agent is N, N-methylenebisacrylamide and the initiator is potassium persulfate.
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