CN113882154A - Flexible PPy/MXene-PDA photo-thermal fabric for solar evaporator and preparation method thereof - Google Patents
Flexible PPy/MXene-PDA photo-thermal fabric for solar evaporator and preparation method thereof Download PDFInfo
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- CN113882154A CN113882154A CN202111250918.8A CN202111250918A CN113882154A CN 113882154 A CN113882154 A CN 113882154A CN 202111250918 A CN202111250918 A CN 202111250918A CN 113882154 A CN113882154 A CN 113882154A
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/14—Treatment of water, waste water, or sewage by heating by distillation or evaporation using solar energy
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/73—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof
- D06M11/74—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof with carbon or graphite; with carbides; with graphitic acids or their salts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/006—Methods of steam generation characterised by form of heating method using solar heat
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/208—Off-grid powered water treatment
- Y02A20/212—Solar-powered wastewater sewage treatment, e.g. spray evaporation
Abstract
The invention discloses a flexible PPy/MXene-PDA photo-thermal fabric for a solar evaporator and a preparation method thereof, wherein the preparation method comprises the following steps: mixing Ti3AlC2Adding the powder into hydrofluoric acid solution, continuously stirring at constant temperature to obtain mixed solution, ultrasonically stripping and high-speed centrifugally cleaning the mixed solution until the pH value of the supernatant of the mixed solution is close to 6, drying the sediments in the mixed solution in vacuum, grinding and sieving to obtain Ti3C2MXene powder; adding the polyester fiber fabric into a weak-alkaline dopamine hydrochloride solution, continuously stirring, taking out and drying to obtain a polydopamine fabric; adding Ti to deionized water3C2Continuously stirring MXene powder, pyrrole and isopropanol to obtain PPy/MXene ink; and adding the polydopamine fabric into the PPy/MXene ink, and continuously stirring to obtain the PPy/MXene-PDA photo-thermal fabric. The invention has better practicability and environmental applicability and is more convenient to transport.
Description
Technical Field
The invention belongs to the technical field of photo-thermal material preparation, and particularly relates to a flexible PPy/MXene-PDA photo-thermal fabric for a solar evaporator and a preparation method thereof.
Background
With the pollution of the environment and the rapid growth of the population, the problem of shortage of fresh water resources is increasingly highlighted. Numerous experiments and studies have shown that seawater desalination is the most feasible approach to solve global water resource shortages, and solar energy, as an inexhaustible environmental energy source, is considered to be the most suitable energy source for seawater desalination. Meanwhile, since the conversion of solar energy into heat energy is the most efficient solar energy collection method, the solar energy absorber is used for solar hot water evaporation, which is one of the simplest and most effective methods for seawater desalination. At present, research on solar hot water evaporation mainly focuses on a Solar Drive Interface Evaporation (SDIE) system, and the evaporation system which concentrates solar heat conversion and heat evaporation on a gas-liquid interface can remarkably reduce the influence of heat radiation, heat conduction and heat convection on evaporation performance. In recent years, MXene rapidly draws attention of researchers due to a unique two-dimensional layered structure and a photothermal conversion rate close to 100% theoretically, and the MXene is modified to a certain extent, so that the MXene can be suitable for an SDIE system to carry out solar seawater desalination and becomes a research direction with great prospect.
Although the basic framework for SDIE system has been preliminarily established and proved to be capable of remarkably improving solar hot water evaporation efficiency, the photothermal material as its core has drawbacks and disadvantages. Current research on photothermal materials focuses on its efficiency in a laboratory environment, but neglects its feasibility in practical production. Such as carbon-based materials which are very vulnerable, high-cost metal-based materials, and ceramic-based materials which are difficult to transport, etc., are relatively lacking in practicality although they have excellent photothermal properties. The problems also exist in the research of MXene in the field of photo-thermal materials, and some researches utilize a freeze drying method to prepare a 3D MXene microporous framework and realize very high-efficiency light-steam conversion, but the preparation process is too complex and has higher cost, and the prepared 3D microporous framework is extremely easy to damage, is difficult to transport and maintain and is difficult to apply in actual production. There have also been studies to deposit MXene directly on different substrates for use as solar absorbers, which, although achieving a low cost and simple process flow, are difficult to guarantee with respect to mechanical properties and chemical stability, as well as to adapt to complex use environments. Therefore, a new photo-thermal material is urgently needed, which has considerable practicability while ensuring excellent photo-thermal performance.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a flexible PPy/MXene-PDA photo-thermal fabric for a solar evaporator and a preparation method thereof, and solves the problems that the photo-thermal material prepared by the existing photo-thermal material preparation method is difficult to transport and the photo-thermal performance is unstable.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of a flexible PPy/MXene-PDA photo-thermal fabric for a solar evaporator comprises the following steps: mixing Ti3AlC2Adding the powder into hydrofluoric acid solution, continuously stirring at constant temperature to obtain mixed solution, ultrasonically stripping and high-speed centrifugally cleaning the mixed solution until the pH value of the supernatant of the mixed solution is close to 6, drying the sediments in the mixed solution in vacuum, grinding and sieving to obtain Ti3C2MXene powder;
adding the polyester fiber fabric into a weak-alkaline dopamine hydrochloride solution, continuously stirring, taking out and drying to obtain a polydopamine fabric;
adding Ti to deionized water3C2Continuously stirring MXene powder, pyrrole and isopropanol to obtain PPy/MXene ink;
and adding the polydopamine fabric into the PPy/MXene ink, and continuously stirring to obtain the PPy/MXene-PDA photo-thermal fabric.
Further, before adding the polyester fiber fabric into the weak alkaline dopamine hydrochloride solution, the method also comprises the steps of carrying out ultrasonic cleaning on the polyester fiber fabric in an absolute ethyl alcohol or acetone solution, taking out the polyester fiber fabric after the ultrasonic cleaning, and drying the polyester fiber fabric to obtain the clean polyester fiber fabric.
Furthermore, the ultrasonic cleaning of the polyester fiber fabric in absolute ethyl alcohol or acetone solution is carried out for 2-4 times, and the time of each ultrasonic cleaning is 20-40 min.
Furthermore, the concentration of hydrofluoric acid in the hydrofluoric acid solution is 36-40%, and Ti3AlC2Adding the powder into hydrofluoric acid solution, and stirring at 30-40 deg.C for 24-48 h;
the temperature for vacuum drying the deposit in the mixed solution is 50-70 ℃.
Further, the concentration of the dopamine hydrochloride solution is 1-3 g/L;
and the weak-base dopamine hydrochloride solution is subjected to pH value adjustment to 8-9 by a Tris buffer.
Further, the polyester fiber fabric is added into weak alkaline dopamine hydrochloride solution and stirred for 12-24 hours.
Further, adding Ti to deionized water3C2MXene powder, pyrrole and isopropanol, and the stirring duration is 6-12 h.
Further, the deionized water and Ti3C2The mass ratio of MXene powder to pyrrole to isopropanol is as follows: 1000: (4-8): (20-60): (50-150).
Further, the polydopamine fabric is added into the PPy/MXene ink, and the stirring time is 12-24 h.
The invention also provides a flexible PPy/MXene-PDA photo-thermal fabric for the solar evaporator, which is prepared by the preparation method of the flexible PPy/MXene-PDA photo-thermal fabric for the solar evaporator.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention provides a preparation method of a flexible PPy/MXene-PDA photo-thermal fabric for a portable and high-efficiency solar evaporator, which adopts a cheap polyester fiber fabric as a matrix and Ti3AlC2Preparation of Ti in powder and hydrofluoric acid solution3C2MXene powder, preparing polydopamine fabric from polyester fabric by weakly alkaline dopamine hydrochloride solution, and adding Ti into deionized water3C2MXene powder, pyrrole and isopropanol to obtain PPy/MXene ink; finally, adding the polydopamine fabric into PPy/MXene printing ink to obtain PPy/MXene-PDA photo-thermal fabric, wherein the polydopamine, polypyrrole and MXene have excellent photo-thermal properties, and the combination of the polydopamine, polypyrrole and MXene can greatly improve the photo-thermal conversion efficiency of a sample; the polydopamine and the polypyrrole have a large number of active groups, so that MXene can be stably combined with the fiber fabric; the fiber fabric has the characteristics of hydrophilicity and porosity, so that stable water transportation can be realized, and diffuse reflection of light is reduced; the fabric prepared by the invention can be folded at will, has small volume and light weight, can be repeatedly cleaned, and is convenient to transport and maintain. In conclusion, the PPy/MXene-PDA fabric has the advantages of lower preparation cost, better stability, better practicability and environmental applicability and more convenience in transportation while ensuring excellent photothermal conversion performance.
Furthermore, before the polyester fiber fabric is added into the weak alkaline dopamine hydrochloride solution, impurities on the surface of the fabric can be effectively removed by ultrasonic cleaning, so that the dopamine hydrochloride can be self-polymerized on the surface of the fabric to form polydopamine;
further, etching of Ti using hydrofluoric acid3AlC2Preparation of Ti3C2MXene, the proper concentration of hydrofluoric acid, stirring temperature and stirring time can ensure proper etching degree, and the proper sediment drying temperature can effectively avoid Ti3C2MXene is oxidized to obtain Ti with excellent performance3C2MXene powder;
furthermore, the pH value of the dopamine hydrochloride solution is adjusted to be alkalescent by using a Tris buffer, so that dopamine hydrochloride can be polymerized to form polydopamine under the condition of no initiator, the cost is saved, and the preparation process is simplified;
further, the polyester fiber fabric is added into the dopamine hydrochloride solution which is adjusted to be alkalescent and stirred, a layer of polydopamine can be formed on the surface of the polyester fiber, meanwhile, a large number of active groups are introduced, and then the prepared polydopamine fabric is added into PPy/MXene ink and stirred, so that the PPy/MXene can be combined with the polyester fiber fabric more stably;
further, deionized water, Ti3C2The proper mass ratio of MXene powder, pyrrole and isopropanol ensures that the prepared PPy/MXene ink can be uniformly and stably combined with the polyester fiber fabric.
Drawings
FIG. 1 shows the surface wettability of various types of fiber fabrics, wherein a in FIG. 1 is the surface wettability of the original polyester fiber fabric, b in FIG. 1 is the surface wettability of the PDA fiber fabric, and c in FIG. 1 is the surface lubricity of the PPy/MXene-PDA photothermal fabric;
FIG. 2 is SEM images of various types of fiber fabrics, wherein a in FIG. 2 is an SEM image of an original polyester fiber fabric, b in FIG. 2 is an SEM image of a PDA fiber fabric, and c in FIG. 2 is an SEM image of a PPy/MXene-PDA photo-thermal fabric;
FIG. 3 shows the reflection spectrum and the refraction spectrum of a PPy/MXene-PDA photo-thermal fabric;
fig. 4 shows the change in the mass of water in a solar evaporator over time for different operating conditions.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
The invention provides a preparation method of a flexible polypyrrole/MXene-dopamine (PPy/MXene-PDA) photo-thermal fabric for a solar evaporator, which comprises the following steps:
step 1: mixing Ti3AlC2Adding the powder into hydrofluoric acid solution, continuously stirring at constant temperature, circularly performing ultrasonic stripping and high-speed centrifugal cleaning for several times after stirring till the pH value of supernatant is 5.5-6.5, drying the deposit in vacuum, grinding and sieving to obtain Ti3C2MXene powder.
Wherein, the concentration of hydrofluoric acid is 36-40%, the stirring temperature is 30-40 ℃, the stirring time is 24-48h, and the vacuum drying temperature is 50-70 ℃.
Step 2: cutting commercial polyester fiber fabric into required size (such as circle with diameter of 4 cm), ultrasonic cleaning in anhydrous ethanol or acetone solution for 2-4 times (each time for 20-40min), taking out, and oven drying to obtain clean polyester fiber fabric.
And step 3: and adding the cleaned polyester fiber fabric into a weak alkaline dopamine hydrochloride solution, continuously stirring at room temperature for 12-24h, taking out and drying to obtain the polydopamine fabric.
Wherein the concentration of the dopamine hydrochloride solution is 1-3g/L, and the pH value is adjusted to 8-9 by using a Tris buffer.
And 4, step 4: adding Ti to deionized water3C2MXene powder, pyrrole and isopropanol are stirred for 6-12h at room temperature to obtain PPy/MXene ink.
Wherein, deionized water and Ti3C2The mass ratio of MXene powder to pyrrole to isopropanol is 1000: (4-8): (20-60): (50-150).
And 5: and adding the prepared polydopamine fabric into the PPy/MXene ink, and continuously stirring at room temperature for 12-24h to obtain the final PPy/MXene-PDA photo-thermal fabric.
Example 1
Step 1: mixing Ti3AlC2Adding the powder into hydrofluoric acid solution, stirring, circularly performing ultrasonic stripping and high-speed centrifugal cleaning for several times until the pH value of the supernatant is 6, vacuum drying the deposit, and grindingGrinding and sieving to obtain Ti3C2MXene powder.
Wherein the concentration of hydrofluoric acid is 36%, the stirring temperature is 30 ℃, the stirring time is 24h, and the vacuum drying temperature is 50 ℃.
Step 2: cutting commercial polyester fiber fabric into required size (such as circle with diameter of 4 cm), ultrasonic cleaning in absolute ethanol or acetone solution for 2 times (each time for 20min), taking out, and oven drying to obtain clean polyester fiber fabric.
And step 3: and adding the cleaned polyester fiber fabric into a weak alkaline dopamine hydrochloride solution, continuously stirring at room temperature for 12 hours, and then taking out and drying to obtain the polydopamine fabric.
Wherein the concentration of the dopamine hydrochloride solution is 1g/L, and the pH value is adjusted to 8 by using a Tris buffer.
And 4, step 4: adding Ti to deionized water3C2MXene powder, pyrrole and isopropanol were stirred at room temperature for 6h to give PPy/MXene ink.
Wherein, deionized water and Ti3C2The mass ratio of MXene powder to pyrrole to isopropanol is 1000: 4: 20: 50.
and 5: adding the prepared polydopamine fabric into the PPy/MXene ink, and continuously stirring at room temperature for 12h to obtain the final PPy/MXene-PDA photo-thermal fabric.
Example 2
Step 1: mixing Ti3AlC2Adding the powder into hydrofluoric acid solution, continuously stirring at constant temperature, circularly performing ultrasonic stripping and high-speed centrifugal cleaning for several times after stirring till the pH value of the supernatant is 5.5, drying the deposit in vacuum, grinding and sieving to obtain Ti3C2MXene powder.
Wherein the concentration of the hydrofluoric acid is 40%, the stirring temperature is 40 ℃, the stirring time is 48h, and the vacuum drying temperature is 70 ℃.
Step 2: cutting commercial polyester fiber fabric into required size (such as circle with diameter of 4 cm), performing ultrasonic cleaning in absolute ethanol or acetone solution for 4 times (each time for 40min), taking out, and oven drying to obtain clean polyester fiber fabric.
And step 3: and adding the cleaned polyester fiber fabric into a weakly alkaline dopamine hydrochloride solution, continuously stirring for 24 hours at room temperature, taking out and drying to obtain the polydopamine fabric.
Wherein the concentration of the dopamine hydrochloride solution is 3g/L, and the pH value is adjusted to 9 by using a Tris buffer.
And 4, step 4: adding Ti to deionized water3C2MXene powder, pyrrole and isopropanol were stirred at room temperature for 12h to give PPy/MXene ink.
Wherein, deionized water and Ti3C2The mass ratio of MXene powder to pyrrole to isopropanol is 1000: 8: 60: 150.
and 5: adding the prepared polydopamine fabric into the PPy/MXene ink, and continuously stirring at room temperature for 24h to obtain the final PPy/MXene-PDA photo-thermal fabric.
Example 3
Step 1: mixing Ti3AlC2Adding the powder into hydrofluoric acid solution, continuously stirring at constant temperature, circularly performing ultrasonic stripping and high-speed centrifugal cleaning for several times after stirring till the pH value of the supernatant is 5.5, drying the deposit in vacuum, grinding and sieving to obtain Ti3C2MXene powder.
Wherein the concentration of hydrofluoric acid is 38%, the stirring temperature is 35 ℃, the stirring time is 36h, and the vacuum drying temperature is 60 ℃.
Step 2: cutting commercial polyester fiber fabric into required size (such as circle with diameter of 4 cm), ultrasonic cleaning in absolute ethanol or acetone solution for 3 times (each time for 30min), taking out, and oven drying to obtain clean polyester fiber fabric.
And step 3: and adding the cleaned polyester fiber fabric into a weakly alkaline dopamine hydrochloride solution, continuously stirring for 18h at room temperature, taking out and drying to obtain the polydopamine fabric.
Wherein the concentration of the dopamine hydrochloride solution is 2g/L, and the pH value is adjusted to 8.5 by using a Tris buffer.
And 4, step 4: adding Ti to deionized water3C2MXene powder, pyrrole and isopropanol were stirred at room temperature for 9h to give PPy/MXene ink.
Wherein, deionized water and Ti3C2The mass ratio of MXene powder to pyrrole to isopropanol is 1000: 6: 40: 100.
and 5: adding the prepared polydopamine fabric into the PPy/MXene ink, and continuously stirring at room temperature for 18h to obtain the final PPy/MXene-PDA photo-thermal fabric.
Example 4
Step 1: mixing Ti3AlC2Adding the powder into hydrofluoric acid solution, continuously stirring at constant temperature, circularly performing ultrasonic stripping and high-speed centrifugal cleaning for several times after stirring till the pH value of the supernatant is 6, drying the deposit in vacuum, grinding and sieving to obtain Ti3C2MXene powder.
Wherein the concentration of the hydrofluoric acid is 40%, the stirring temperature is 35 ℃, the stirring time is 42h, and the vacuum drying temperature is 60 ℃.
Step 2: cutting commercial polyester fiber fabric into required size (such as circle with diameter of 4 cm), ultrasonic cleaning in absolute ethanol or acetone solution for 3 times (each time for 30min), taking out, and oven drying to obtain clean polyester fiber fabric.
And step 3: and adding the cleaned polyester fiber fabric into a weak alkaline dopamine hydrochloride solution, continuously stirring at room temperature for 12 hours, and then taking out and drying to obtain the polydopamine fabric.
Wherein the concentration of the dopamine hydrochloride solution is 3g/L, and the pH value is adjusted to 8.5 by using a Tris buffer.
And 4, step 4: adding Ti to deionized water3C2MXene powder, pyrrole and isopropanol were stirred at room temperature for 8h to give PPy/MXene ink.
Wherein, deionized water and Ti3C2The mass ratio of MXene powder to pyrrole to isopropanol is 1000: 8: 60: 150.
and 5: adding the prepared polydopamine fabric into the PPy/MXene ink, and continuously stirring at room temperature for 12h to obtain the final PPy/MXene-PDA photo-thermal fabric.
Example 5
Step 1: mixing Ti3AlC2Adding the powder into hydrofluoric acid solution, continuously stirring at constant temperature, circularly performing ultrasonic stripping and high-speed centrifugal cleaning for several times after stirring till the pH value of the supernatant is 6, drying the deposit in vacuum, grinding and sieving to obtain Ti3C2MXene powder.
Wherein the concentration of the hydrofluoric acid is 40%, the stirring temperature is 35 ℃, the stirring time is 42h, and the vacuum drying temperature is 60 ℃.
Step 2: cutting commercial polyester fiber fabric into required size (such as circle with diameter of 4 cm), ultrasonic cleaning in absolute ethanol or acetone solution for 3 times (each time for 30min), taking out, and oven drying to obtain clean polyester fiber fabric.
And step 3: and adding the cleaned polyester fiber fabric into a weak alkaline dopamine hydrochloride solution, continuously stirring at room temperature for 12 hours, and then taking out and drying to obtain the polydopamine fabric.
Wherein the concentration of the dopamine hydrochloride solution is 2g/L, and the pH value is adjusted to 8.5 by using a Tris buffer.
And 4, step 4: MXene, pyrrole and isopropanol were added to deionized water and stirred at room temperature for 8h to give PPy/MXene ink.
Wherein the mass ratio of the deionized water to the MXene to the pyrrole to the isopropanol is 1000: 6: 40: 100.
and 5: adding the prepared polydopamine fabric into the PPy/MXene ink, and continuously stirring at room temperature for 12h to obtain the final PPy/MXene-PDA photo-thermal fabric.
As shown in fig. 1, a drop of water is absorbed in less than 700ms when contacting the surface of the untreated polyester fiber, and it is seen that the fiber fabric has certain hydrophilic property. In the graph b, the hydrophilic performance of the polydopamine modified fiber fabric is remarkably improved, and the contacted water drops are completely absorbed only 250 ms. In the graph c, the sample absorbs water drops more rapidly, and the hydrophilic property of the fiber fabric modified again by the PPy/MXene ink is further improved.
As shown in fig. 2, a, b and c, comparing the surface morphology and microstructure of the original polyester fiber fabric, the PDA fabric and the PPy/MXene-PDA photo-thermal fabric, it can be clearly seen that after the poly-dopamine decoration, a large number of particles are distributed on the surface of the fiber, after the PPy/MXene further decoration, the particles on the surface of the fiber are significantly increased, and it can be seen that MXene is successfully combined with polyester fiber through the grafting of PDA and PPy.
As shown in fig. 3, in order to quantify the absorption performance of the PPy/MXene-PDA photothermal fabric for sunlight, the reflectance and transmittance of the sample were characterized using an ultraviolet-visible-near infrared spectrophotometer. As shown in FIG. 3, the PPy/MXene-PDA photo-thermal fabric has very low diffuse reflectance and transmittance at the full spectrum of 2500nm at 200-. According to the calculation of the normalized spectrum solar irradiance density (AM1.5), the broadband light absorptivity of the PPy/MXene-PDA photo-thermal fabric is as high as 93.5%, and the PPy/MXene-PDA photo-thermal fabric has excellent light absorption performance.
As shown in fig. 4, in order to evaluate the actual evaporation performance of PPy/MXene-PDA photothermal fabrics in a solar interface evaporation system, the mass of water in the solar evaporator was recorded over time under different working conditions using a high precision electronic balance. As can be seen from fig. 4, when there is no high-efficiency solar absorber in the solar evaporator, the amount of water evaporated is small regardless of the presence or absence of solar irradiation, whereas the amount of water evaporated is significantly increased after introducing the PDA fabric and the PPy/MXene-PDA photothermal fabric as the solar absorber. Meanwhile, under the same sun irradiation, the water amount evaporated by the solar evaporator taking the PPy/MXene-PDA photo-thermal fabric as the solar absorber in the same time is obviously more, so that the PPy/MXene-PDA photo-thermal fabric has excellent evaporation performance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A preparation method of a flexible PPy/MXene-PDA photo-thermal fabric for a solar evaporator is characterized by comprising the following steps: mixing Ti3AlC2Adding the powder into a hydrofluoric acid solution, continuously stirring at a constant temperature to obtain a mixed solution, carrying out ultrasonic stripping and high-speed centrifugal cleaning on the mixed solution until the pH value of a supernatant of the mixed solution is 5.5-6.5, carrying out vacuum drying on a deposit in the mixed solution, grinding and sieving to obtain Ti3C2MXene powder;
adding the polyester fiber fabric into a weak-alkaline dopamine hydrochloride solution, continuously stirring, taking out and drying to obtain a polydopamine fabric;
adding Ti to deionized water3C2Continuously stirring MXene powder, pyrrole and isopropanol to obtain PPy/MXene ink;
and adding the polydopamine fabric into the PPy/MXene ink, and continuously stirring to obtain the PPy/MXene-PDA photo-thermal fabric.
2. The method for preparing the flexible PPy/MXene-PDA photo-thermal fabric for the solar evaporator according to claim 1, wherein before adding the polyester fabric into the weak alkaline dopamine hydrochloride solution, the method further comprises the steps of ultrasonically cleaning the polyester fabric in absolute ethyl alcohol or acetone solution, taking out the polyester fabric after ultrasonic cleaning, and drying to obtain the clean polyester fabric.
3. The method for preparing the flexible PPy/MXene-PDA photo-thermal fabric for the solar evaporator according to claim 2, wherein the number of times of the ultrasonic cleaning of the polyester fiber fabric in the absolute ethyl alcohol or acetone solution is 2-4, and the time of each ultrasonic cleaning is 20-40 min.
4. The method for preparing the flexible PPy/MXene-PDA photo-thermal fabric for the solar evaporator as claimed in claim 1, wherein the hydrofluoric acid solution has a concentration of 36-40% of hydrofluoric acid and Ti3AlC2Adding the powder into hydrofluoric acid solution, and stirring at 30-40 deg.C for 24-48 h;
the temperature for vacuum drying the deposit in the mixed solution is 50-70 ℃.
5. The method for preparing the flexible PPy/MXene-PDA photo-thermal fabric for the solar evaporator according to claim 1, wherein the concentration of the dopamine hydrochloride solution is 1-3 g/L;
and the weak-base dopamine hydrochloride solution is subjected to pH value adjustment to 8-9 by a Tris buffer.
6. The method for preparing the flexible PPy/MXene-PDA photo-thermal fabric for the solar evaporator as claimed in claim 1, wherein the time for stirring the polyester fiber fabric added with weak alkaline dopamine hydrochloride solution is 12-24 h.
7. The method for preparing the flexible PPy/MXene-PDA photo-thermal fabric for the solar evaporator as claimed in claim 1, wherein Ti is added into deionized water3C2MXene powder, pyrrole and isopropanol, and the stirring duration is 6-12 h.
8. The method for preparing the flexible PPy/MXene-PDA photo-thermal fabric for the solar evaporator as claimed in claim 1, wherein the deionized water, Ti3C2Quality of MXene powder, pyrrole and isopropanolThe ratio is as follows: 1000: (4-8): (20-60): (50-150).
9. The method for preparing the flexible PPy/MXene-PDA photo-thermal fabric for the solar evaporator as claimed in claim 1, wherein the poly dopamine fabric is added into the PPy/MXene ink, and the stirring time is 12-24 h.
10. A flexible PPy/MXene-PDA photothermal fabric for a solar evaporator, which is prepared by the method of any one of claims 1 to 9.
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