CN113882154B - 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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- CN113882154B CN113882154B CN202111250918.8A CN202111250918A CN113882154B CN 113882154 B CN113882154 B CN 113882154B CN 202111250918 A CN202111250918 A CN 202111250918A CN 113882154 B CN113882154 B CN 113882154B
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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 Ti is used for preparing the photo-thermal fabric 3 AlC 2 Adding the powder into hydrofluoric acid solution, stirring at constant temperature to obtain mixed solution, ultrasonic stripping and high-speed centrifugal cleaning until pH value of supernatant of the mixed solution is close to 6, vacuum drying the sediment in the mixed solution, grinding and sieving to obtain Ti 3 C 2 MXene powder; adding the polyester fiber fabric into a weak alkaline dopamine hydrochloride solution, stirring, taking out and drying to obtain a polydopamine fabric; adding Ti into deionized water 3 C 2 MXene powder, pyrrole and isopropanol, and stirring to obtain PPy/MXene ink; and adding the polydopamine fabric into the PPy/MXene ink, and 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 environmental pollution and rapid population growth, the problem of shortage of fresh water resources is increasingly highlighted. Numerous experiments and studies have shown that sea water desalination is the most feasible way to address global water resource shortages, while solar energy is considered the most suitable energy for sea water desalination as an inexhaustible environmental energy source. Meanwhile, because the solar energy is converted into heat energy in a solar energy collecting mode with highest efficiency, the solar energy absorber is utilized for evaporating solar hot water, and the method is one of the simplest and most effective methods for sea water desalination. At present, research on solar hot water evaporation mainly focuses on a Solar Driven 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, due to the unique two-dimensional layered structure and the theoretical photo-thermal conversion rate approaching 100%, MXene rapidly attracts attention of researchers, and the MXene is modified to a certain extent, so that the MXene can be suitable for solar seawater desalination of an SDIE system and becomes a very promising research direction.
Although a basic frame about the SDIE system has been initially established and proved to be capable of significantly improving solar hot water evaporation efficiency, the photo-thermal material as its core has drawbacks and disadvantages. Current research on photo-thermal materials focuses on their efficiency in laboratory environments, but ignores their feasibility in practical production. Such as carbon-based materials, high-cost metal-based materials, and ceramic-based materials that are difficult to transport, which are extremely vulnerable, have excellent photo-thermal properties, but are relatively lacking in practical use. The research of MXene in the field of photo-thermal materials also has the problems, and some researches utilize a freeze-drying method to prepare a 3D MXene microporous framework, so that very efficient light steam conversion is realized, but the preparation process is too complex and high in cost, and the prepared 3D microporous framework is extremely easy to damage, difficult to transport and maintain and difficult to apply in actual production. There have also been some studies on the direct deposition of MXene onto different substrates as solar absorbers, which, although achieving low cost and simple process flows, are difficult to guarantee in terms of mechanical properties and chemical stability, and also difficult to adapt to complex use environments. Therefore, a novel photo-thermal material is urgent, and 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 a photo-thermal material prepared by the existing photo-thermal material preparation method is not easy to transport and has unstable photo-thermal performance.
In order to achieve the above purpose, the present invention provides the following technical solutions: the preparation method of the flexible PPy/MXene-PDA photo-thermal fabric for the solar evaporator comprises the following steps: ti is mixed with 3 AlC 2 Adding the powder into hydrofluoric acid solution, stirring at constant temperature to obtain mixed solution, ultrasonic stripping and high-speed centrifugal cleaning until pH value of supernatant of the mixed solution is close to 6, vacuum drying the sediment in the mixed solution, grinding, and sieving to obtain Ti 3 C 2 MXene powder;
adding the polyester fiber fabric into a weak alkaline dopamine hydrochloride solution, continuously stirring, and taking out and drying to obtain the polydopamine fabric;
adding Ti into deionized water 3 C 2 MXene powder, pyrrole and isopropanol, and continuously stirring 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 further comprises the steps of carrying out ultrasonic cleaning on the polyester fiber fabric in absolute ethyl alcohol or acetone solution, taking out the polyester fiber fabric after ultrasonic cleaning, and drying to obtain the clean polyester fiber fabric.
Further, the times of ultrasonic cleaning of the polyester fiber fabric in absolute ethyl alcohol or acetone solution is 2-4 times, and the time of ultrasonic cleaning each time is 20-40min.
Further, the concentration of hydrofluoric acid in the hydrofluoric acid solution is 36-40%, ti 3 AlC 2 Adding the powder into hydrofluoric acid solution, stirring at 30-40deg.C for 2 times4-48h；
The temperature at which the deposit in the mixed solution is dried in vacuo is 50-70 ℃.
Further, the concentration of the dopamine hydrochloride solution is 1-3g/L;
the pH value of the weakly alkaline dopamine hydrochloride solution is adjusted to 8-9 by Tris buffer.
Further, the polyester fiber fabric is added into the weak alkaline dopamine hydrochloride solution and stirred for 12-24 hours.
Further, adding Ti into deionized water 3 C 2 MXene powder, pyrrole and isopropanol, stirring duration was 6-12h.
Further, the deionized water and Ti 3 C 2 The mass ratio of the MXene powder to the pyrrole to the 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 hours.
The invention also provides a flexible PPy/MXene-PDA photo-thermal fabric for the solar evaporator, which is prepared by adopting 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 efficient solar evaporator, which uses a low-cost polyester fiber fabric as a matrix and uses Ti as a raw material 3 AlC 2 Preparation of Ti in powder and hydrofluoric acid solution 3 C 2 MXene powder, and simultaneously preparing the polyester fiber fabric through a weak alkaline dopamine hydrochloride solution to obtain the polydopamine fabric, and adding Ti into deionized water 3 C 2 MXene powder, pyrrole and isopropanol to obtain PPy/MXene ink; finally, adding the polydopamine fabric into the PPy/MXene ink to obtain the PPy/MXene-PDA photo-thermal fabric, wherein 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 of the sampleEfficiency is improved; the polydopamine and the polypyrrole have a large number of active groups, so that the MXene can be stably combined with the fiber fabric; the fiber fabric has the characteristics of hydrophilicity and porosity, can realize stable water transportation, and simultaneously reduces diffuse reflection of light; the fabric prepared by the invention can be folded at will, has small volume and light weight, can be repeatedly cleaned, and is convenient for transportation and maintenance. In conclusion, the PPy/MXene-PDA fabric ensures excellent photo-thermal conversion performance, and meanwhile, has the advantages of lower preparation cost, better stability, better practicability and environmental applicability and more convenience in transportation.
Furthermore, before the polyester fiber fabric is added into the weak alkaline dopamine hydrochloride solution, the 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 Ti using hydrofluoric acid 3 AlC 2 Preparation of Ti 3 C 2 In the process of MXene, proper hydrofluoric acid concentration, stirring temperature and stirring time can ensure proper etching degree, and proper sediment drying temperature can effectively avoid Ti 3 C 2 MXene is oxidized to obtain Ti with excellent performance 3 C 2 MXene powder;
furthermore, the pH value of the dopamine hydrochloride solution is regulated to be weak alkaline by using the Tris buffer, so that dopamine hydrochloride can be self-polymerized to form polydopamine under the condition of no initiator, the cost is saved, and the preparation process is simplified;
further, adding the polyester fiber fabric into the dopamine hydrochloride solution which is regulated to be weak alkaline for stirring, forming a layer of polydopamine on the surface of the polyester fiber, introducing a large number of active groups, and adding the prepared polydopamine fabric into the PPy/MXene ink for stirring, so that the PPy/MXene can be combined with the polyester fiber fabric more stably;
further, deionized water, ti 3 C 2 The proper mass ratio of the MXene powder, the pyrrole and the 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 fabrics, FIG. 1 a shows the surface wettability of the original polyester fabric, FIG. 1 b shows the surface wettability of the PDA fabric, and FIG. 1 c shows the surface lubricity of the PPy/MXene-PDA photo-thermal fabric;
FIG. 2 is an SEM image of various types of fabrics, FIG. 2 a is an SEM image of the original polyester fabric, FIG. 2 b is an SEM image of the PDA fabric, and FIG. 2 c is an SEM image of the PPy/MXene-PDA photo-thermal fabric;
FIG. 3 is a reflectance and refraction spectrum of the PPy/MXene-PDA photo-thermal fabric;
fig. 4 shows the change of water quality with time in a solar evaporator under different working conditions.
Detailed Description
The invention is further described below with reference to the drawings and the 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 of:
step 1: ti is mixed with 3 AlC 2 Adding 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 is completed until the pH value of supernatant is 5.5-6.5, vacuum drying sediment, grinding and sieving to obtain Ti 3 C 2 MXene 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 round shape with diameter of 4 cm), ultrasonic cleaning in absolute ethanol or acetone solution for 2-4 times (20-40 min each time), and oven drying to obtain clean polyester fiber fabric.
Step 3: adding the cleaned polyester fiber fabric into the dopamine hydrochloride solution which is regulated to be alkalescent, continuously stirring for 12-24 hours at room temperature, and then 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.
Step 4: adding Ti into deionized water 3 C 2 MXene powder, pyrrole and isopropanol are stirred at room temperature for 6-12h to obtain PPy/MXene ink.
Wherein, deionized water and Ti 3 C 2 The mass ratio of the MXene powder to the pyrrole to the isopropanol is 1000: (4-8): (20-60): (50-150).
Step 5: adding the prepared polydopamine fabric into the PPy/MXene ink, and continuously stirring for 12-24 hours at room temperature to obtain the final PPy/MXene-PDA photo-thermal fabric.
Example 1
Step 1: ti is mixed with 3 AlC 2 Adding the powder into hydrofluoric acid solution, stirring at constant temperature, performing ultrasonic stripping and high-speed centrifugal cleaning for several times after stirring, vacuum drying the precipitate, grinding, and sieving to obtain Ti 3 C 2 MXene powder.
Wherein the concentration of hydrofluoric acid is 36%, the stirring temperature is 30 ℃, the stirring time is 24 hours, and the vacuum drying temperature is 50 ℃.
Step 2: cutting the commercial polyester fiber fabric into a required size (for example, a circular shape with a diameter of 4 cm), performing ultrasonic cleaning in absolute ethyl alcohol or acetone solution for 2 times (20 min each time), and taking out and drying to obtain the clean polyester fiber fabric.
Step 3: and adding the cleaned polyester fiber fabric into the dopamine hydrochloride solution which is regulated to be alkalescent, continuously stirring for 12 hours at room temperature, 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.
Step 4: adding Ti into deionized water 3 C 2 MXene powder, pyrrole and isopropanol were stirred at room temperature for 6h to give PPy/MXene ink.
Wherein, deionized water and Ti 3 C 2 The mass ratio of the MXene powder to the pyrrole to the isopropanol is 1000:4:20:50.
step 5: and adding the prepared polydopamine fabric into the PPy/MXene ink, and continuously stirring for 12 hours at room temperature to obtain the final PPy/MXene-PDA photo-thermal fabric.
Example 2
Step 1: ti is mixed with 3 AlC 2 Adding the powder into hydrofluoric acid solution, stirring at constant temperature, performing ultrasonic stripping and high-speed centrifugal cleaning for several times after stirring, vacuum drying the supernatant until pH is 5.5, grinding and sieving to obtain Ti 3 C 2 MXene powder.
Wherein the concentration of hydrofluoric acid is 40%, the stirring temperature is 40 ℃, the stirring time is 48h, and the vacuum drying temperature is 70 ℃.
Step 2: the commercial polyester fiber fabric is cut into a required size (for example, a circular shape with a diameter of 4 cm), ultrasonic cleaning is performed for 4 times (40 min each time) in absolute ethyl alcohol or acetone solution, and then the polyester fiber fabric is taken out and dried to obtain the clean polyester fiber fabric.
Step 3: and adding the cleaned polyester fiber fabric into the dopamine hydrochloride solution which is regulated to be alkalescent, continuously stirring for 24 hours at room temperature, 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 9 by using a Tris buffer.
Step 4: adding Ti into deionized water 3 C 2 MXene powder, pyrrole and isopropanol were stirred at room temperature for 12h to give PPy/MXene ink.
Wherein, deionized water and Ti 3 C 2 The mass ratio of the MXene powder to the pyrrole to the isopropanol is 1000:8:60:150.
step 5: and adding the prepared polydopamine fabric into the PPy/MXene ink, and continuously stirring for 24 hours at room temperature to obtain the final PPy/MXene-PDA photo-thermal fabric.
Example 3
Step 1: ti is mixed with 3 AlC 2 Adding the powder into hydrofluoric acid solution, stirring at constant temperature, and performing ultrasonic stripping and high-speed centrifugation for several timesWashing until pH of supernatant is 5.5, vacuum drying, grinding, and sieving to obtain Ti 3 C 2 MXene 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: the commercial polyester fiber fabric is cut into a desired size (for example, a circular shape with a diameter of 4 cm), ultrasonic cleaning is performed 3 times (30 min each time) in absolute ethyl alcohol or acetone solution, and then the polyester fiber fabric is taken out and dried to obtain a clean polyester fiber fabric.
Step 3: and adding the cleaned polyester fiber fabric into the dopamine hydrochloride solution which is regulated to be alkalescent, continuously stirring for 18 hours at room temperature, 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 Tris buffer.
Step 4: adding Ti into deionized water 3 C 2 MXene powder, pyrrole and isopropanol were stirred at room temperature for 9h to give PPy/MXene ink.
Wherein, deionized water and Ti 3 C 2 The mass ratio of the MXene powder to the pyrrole to the isopropanol is 1000:6:40:100.
step 5: and adding the prepared polydopamine fabric into the PPy/MXene ink, and continuously stirring for 18 hours at room temperature to obtain the final PPy/MXene-PDA photo-thermal fabric.
Example 4
Step 1: ti is mixed with 3 AlC 2 Adding the powder into hydrofluoric acid solution, stirring at constant temperature, performing ultrasonic stripping and high-speed centrifugal cleaning for several times after stirring, vacuum drying the precipitate, grinding, and sieving to obtain Ti 3 C 2 MXene powder.
Wherein the concentration of hydrofluoric acid is 40%, the stirring temperature is 35 ℃, the stirring time is 42h, and the vacuum drying temperature is 60 ℃.
Step 2: the commercial polyester fiber fabric is cut into a desired size (for example, a circular shape with a diameter of 4 cm), ultrasonic cleaning is performed 3 times (30 min each time) in absolute ethyl alcohol or acetone solution, and then the polyester fiber fabric is taken out and dried to obtain a clean polyester fiber fabric.
Step 3: and adding the cleaned polyester fiber fabric into the dopamine hydrochloride solution which is regulated to be alkalescent, continuously stirring for 12 hours at room temperature, 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 Tris buffer.
Step 4: adding Ti into deionized water 3 C 2 MXene powder, pyrrole and isopropanol were stirred at room temperature for 8h to give PPy/MXene ink.
Wherein, deionized water and Ti 3 C 2 The mass ratio of the MXene powder to the pyrrole to the isopropanol is 1000:8:60:150.
step 5: and adding the prepared polydopamine fabric into the PPy/MXene ink, and continuously stirring for 12 hours at room temperature to obtain the final PPy/MXene-PDA photo-thermal fabric.
Example 5
Step 1: ti is mixed with 3 AlC 2 Adding the powder into hydrofluoric acid solution, stirring at constant temperature, performing ultrasonic stripping and high-speed centrifugal cleaning for several times after stirring, vacuum drying the precipitate, grinding, and sieving to obtain Ti 3 C 2 MXene powder.
Wherein the concentration of hydrofluoric acid is 40%, the stirring temperature is 35 ℃, the stirring time is 42h, and the vacuum drying temperature is 60 ℃.
Step 2: the commercial polyester fiber fabric is cut into a desired size (for example, a circular shape with a diameter of 4 cm), ultrasonic cleaning is performed 3 times (30 min each time) in absolute ethyl alcohol or acetone solution, and then the polyester fiber fabric is taken out and dried to obtain a clean polyester fiber fabric.
Step 3: and adding the cleaned polyester fiber fabric into the dopamine hydrochloride solution which is regulated to be alkalescent, continuously stirring for 12 hours at room temperature, 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 Tris buffer.
Step 4: MXene, pyrrole and isopropanol are added into deionized water, and stirred at room temperature for 8 hours to obtain PPy/MXene ink.
Wherein, the mass ratio of deionized water, MXene, pyrrole and isopropanol is 1000:6:40:100.
step 5: and adding the prepared polydopamine fabric into the PPy/MXene ink, and continuously stirring for 12 hours at room temperature to obtain the final PPy/MXene-PDA photo-thermal fabric.
As shown in fig. 1 a, when a drop of water contacts the surface of untreated polyester fiber, the drop of water is absorbed in less than 700ms, and the fiber fabric itself has certain hydrophilic property. In fig. b, the hydrophilic properties of the polydopamine modified fiber fabric are significantly improved, and the contacted water drops are completely absorbed only for 250 ms. In graph c, the sample absorbs the water drop more rapidly, and the hydrophilic properties of the fiber fabric modified again with PPy/MXene ink can be seen to be further improved.
As shown in fig. 2 a, b and c, comparing the surface morphology and microstructure of the original polyester fiber fabrics, PDA fabrics and PPy/MXene-PDA photo-thermal fabrics, it can be seen that a large number of particles are distributed on the fiber surface after being decorated with polydopamine, and the particles on the fiber surface are significantly increased after being further decorated with PPy/MXene, and that MXene is successfully combined with polyester fibers by grafting of PDA and PPy.
As shown in fig. 3, to quantify the solar light absorption properties of PPy/MXene-PDA photothermal fabrics, the reflectance and transmittance of the samples were characterized using an ultraviolet-visible-near infrared spectrophotometer. As can be seen from FIG. 3, the PPy/MXene-PDA photo-thermal fabric has very low diffuse reflectance and transmittance at a full spectrum of 200-2500 nm. The broadband light absorptivity of the PPy/MXene-PDA photo-thermal fabric is as high as 93.5% according to normalized spectrum solar irradiance density calculation (AM 1.5), and the PPy/MXene-PDA photo-thermal fabric has excellent light absorptivity.
As shown in fig. 4, in order to evaluate the actual evaporation performance of PPy/MXene-PDA photo-thermal fabrics in a solar interface evaporation system, the change of the mass of water in the solar evaporator over time under different working conditions was recorded using a high-precision electronic balance. As can be seen from fig. 4, when there is no efficient solar absorber in the solar evaporator, the amount of evaporated water is small regardless of the presence or absence of solar illumination, and the amount of evaporated water is significantly increased after the PDA fabric and PPy/MXene-PDA photo-thermal fabric are introduced as solar absorbers. Meanwhile, under the same sun irradiation, the amount of water evaporated by the solar evaporator taking the PPy/MXene-PDA photo-thermal fabric as the solar absorber is obviously more in the same time, and the PPy/MXene-PDA photo-thermal fabric has excellent evaporation performance.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The preparation method of the flexible PPy/MXene-PDA photo-thermal fabric for the solar evaporator is characterized by comprising the following steps of: ti is mixed with 3 AlC 2 Adding the powder into hydrofluoric acid solution, continuously stirring at constant temperature to obtain mixed solution, performing ultrasonic stripping and high-speed centrifugal cleaning on the mixed solution until the pH value of supernatant of the mixed solution is 5.5-6.5, vacuum drying sediment in the mixed solution, grinding and sieving to obtain Ti 3 C 2 MXene powder;
adding the polyester fiber fabric into a weak alkaline dopamine hydrochloride solution, continuously stirring, and taking out and drying to obtain the polydopamine fabric;
adding Ti into deionized water 3 C 2 MXene powder, pyrrole and isopropanol, and continuously stirring to obtain PPy/MXene ink;
adding the polydopamine fabric into PPy/MXene ink, and continuously stirring to obtain the PPy/MXene-PDA photo-thermal fabric;
the pH value of the weak alkaline dopamine hydrochloride solution is 8-9.
2. The method for preparing the flexible PPy/MXene-PDA photo-thermal fabric for solar energy evaporator according to claim 1, characterized in that before adding the polyester fiber fabric into the weak alkaline dopamine hydrochloride solution, further comprising the steps of ultrasonic cleaning the polyester fiber fabric in absolute ethyl alcohol or acetone solution, taking out the polyester fiber fabric after ultrasonic cleaning and drying to obtain clean polyester fiber fabric.
3. The method for preparing the flexible PPy/MXene-PDA photo-thermal fabric for solar energy evaporator according to claim 2, characterized in that the number of times of ultrasonic cleaning of the polyester fiber fabric in absolute ethyl alcohol or acetone solution is 2-4, and the time of each ultrasonic cleaning is 20-40min.
4. The method for preparing the flexible PPy/MXene-PDA photo-thermal fabric for the solar evaporator according to claim 1, wherein the concentration of hydrofluoric acid in the hydrofluoric acid solution is 36-40%, ti 3 AlC 2 Adding the powder into hydrofluoric acid solution for stirring at 30-40deg.C for 24-48 hr;
the temperature at which the deposit in the mixed solution is dried in vacuo is 50-70 ℃.
5. The method for preparing the flexible PPy/MXene-PDA photo-thermal fabric for solar evaporator according to claim 1, characterized in that the concentration of the dopamine hydrochloride solution is 1-3g/L;
the pH value of the weakly alkaline dopamine hydrochloride solution is adjusted to 8-9 by Tris buffer.
6. The method for preparing the flexible PPy/MXene-PDA photo-thermal fabric for solar evaporator according to claim 1, characterized in that the polyester fiber fabric is added into the weak alkaline dopamine hydrochloride solution to stir for 12-24 hours.
7. The method for preparing the flexible PPy/MXene-PDA photo-thermal fabric for solar evaporator according to claim 1, wherein Ti is added into deionized water 3 C 2 MXene powder, pyrrole and isopropanol, stirring duration was 6-12h.
8. The method for preparing the flexible PPy/MXene-PDA photo-thermal fabric for solar energy evaporator according to claim 1, wherein the deionized water and Ti 3 C 2 The mass ratio of the MXene powder to the pyrrole to the isopropanol 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 according to claim 1, wherein the polydopamine fabric is added into the PPy/MXene ink, and the stirring time is 12-24 hours.
10. A flexible PPy/MXene-PDA photo-thermal fabric for a solar evaporator, characterized in that it is prepared by a method for preparing a flexible PPy/MXene-PDA photo-thermal fabric for a solar evaporator according to any one of claims 1 to 9.
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| CN115011239B (en) * | 2022-06-23 | 2024-03-01 | 广东省漆色彩新型材料有限公司 | Preparation and application of multifunctional self-cleaning MXene-based photo-thermal protective coating |
| CN115198531B (en) * | 2022-07-28 | 2023-11-24 | 上海师范大学 | Photo-thermal fabric material and preparation method and application thereof |
| CN116218344A (en) * | 2023-03-31 | 2023-06-06 | 中国科学院长春应用化学研究所 | Surface repairing agent for water-based inflatable structural material, and preparation method and application thereof |
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| CN109238522A (en) * | 2018-09-21 | 2019-01-18 | 南开大学 | A kind of wearable flexibility stress sensor and its preparation method and application |
| CN109868646A (en) * | 2019-03-22 | 2019-06-11 | 青岛大学 | The method and product of Electromagnetically shielding fabrics are prepared based on two-dimensional layer MXene nanometer sheet |
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