A dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis, and its preparation method and application

Abstract

The present invention discloses a method for preparing a dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis. The dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis is prepared by in-situ polymerization of photothermal material and in-situ deposition of photocatalytic micro-nanoparticle material on the surface of 3D honeycomb fabric. The photocatalytic micro-nanoparticle material is a hydrotalcite with a nanoflower layered structure and a large specific surface area. The present invention also provides a dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis and its application. The present invention solves the key scientific and technical problem that photothermal evaporation and photocatalytic performance cannot effectively achieve functional and structural synergy during interfacial evaporation. The prepared dual-functional honeycomb fabric material has excellent light absorption capacity and catalytic degradation capacity, achieves structural and functional synergy, and has broad application prospects in the fields of solar thermal water production and sewage degradation.

Description

Technical Field

[0001] The present invention relates to the field of photothermal material engineering technology, and in particular to a dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis, and a preparation method and application thereof. Background Art

[0002] The contradiction between population growth and freshwater shortages has become one of the most challenging issues of the 21st century. Estimates suggest that by 2025, the number of people living in water-scarce areas could increase to 3.9 billion. Therefore, the efficient development of freshwater resources has become a major research topic.

[0003] In recent years, solar energy, as a renewable and clean energy source, has been widely used in seawater desalination, wastewater purification and large-scale power generation. Solar interfacial photothermal evaporation technology converts solar energy absorbed by photothermal materials into thermal energy, and concentrates it on the water surface, heating the surface water layer and increasing the water evaporation rate, providing an effective way to solve the global freshwater resource shortage problem.

[0004] At the same time, with the development of urbanization and industrialization, the emergence of new organic compounds, such as antibiotics, in natural water environments has attracted widespread attention. Their persistence, accumulation, and migration make them far more challenging to control than traditional pollutants. Photocatalytic technology, with its energy-efficient and high catalytic efficiency, is considered one of the most promising technologies for addressing water pollution.

[0005] Current research on photothermal evaporation and photocatalysis primarily focuses on improving photothermal evaporation efficiency or photocatalytic performance. Patent application CN 115710821 A discloses a photothermal conversion textile, its preparation method, and its application. This invention utilizes a modified textile containing a functional monomer to graft an intermediate monomer onto a textile substrate using a graft polymerization method. The functional monomer and the intermediate monomer undergo an in-situ polymerization reaction through in-situ redox modification to produce the photothermal conversion textile. However, the photothermal conversion textile produced by this method lacks photocatalytic degradation capabilities.

[0006] Patent application CN 115159606 A discloses a MOF-derived metal oxide / C composite material that combines photothermal evaporation with catalytic degradation, but fails to demonstrate synergistic effects in an absorption evaporator. Patent application CN 115745050 A discloses a delignified wood wastewater treatment material with an upper photothermal layer and a lower photocatalytic layer. While this material exhibits both photothermal evaporation and photocatalytic properties, it fails to demonstrate a synergistic effect.

[0007] Therefore, exploring the interaction between photothermal evaporation materials and photocatalytic materials through the development of functional materials and rational structural design, elucidating the synergistic mechanism between the two, and achieving efficient functional integration remains a challenge. Therefore, developing a new approach to enable effective functional and structural synergy between photothermal evaporation materials and photocatalytic materials is crucial for achieving sustained, stable, and efficient solar interfacial photothermal evaporation applications. Summary of the Invention

[0008] To address these issues, the present invention provides a method for preparing a dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis. This method achieves this dual-functionality by in-situ polymerization of a photothermal material and in-situ deposition of a photocatalytic micro-nanoparticle material onto the surface of a 3D honeycomb fabric. This method is simple, allows for large-scale continuous production, and has low requirements for equipment and the environment, suggesting broad prospects for industrial application.

[0009] A method for preparing a dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis, comprising the following steps:

[0010] (1) treating a honeycomb fabric with an ethanol aqueous solution by ultrasonic treatment, immersing the honeycomb fabric in a solution of a compound containing a catechol group, performing an in-situ self-polymerization reaction, and drying the honeycomb fabric A;

[0011] (2) immersing the honeycomb fabric A in an oxidizing solution, and then immersing it in a solution of a compound having photothermal conversion properties, performing an in-situ oxidative polymerization reaction, and drying to obtain a honeycomb fabric B;

[0012] (3) The honeycomb fabric B is immersed in a sodium polyacrylate solution and dried to obtain a honeycomb fabric B immersed in the sodium polyacrylate solution. Then, a nanoparticle dispersion having photocatalytic properties is in situ deposited on the honeycomb fabric B immersed in the sodium polyacrylate solution and dried to obtain a dual-functional honeycomb fabric material having photothermal evaporation and photocatalytic synergy.

[0013] The present invention uses 3D honeycomb fabric as a carrier, and in-situ polymerizes photothermal materials and in-situ deposits photocatalytic micro-nanoparticle materials on the 3D honeycomb fabric, respectively, to prepare a dual-function honeycomb fabric material with synergistic photothermal evaporation and photocatalysis. The 3D honeycomb fabric selected by the present invention has a periodic concave array structure, which can realize the capture and recovery of convective heat and radiant heat. At the same time, the photocatalytic micro-nanoparticle material selected by the present invention has a microscopic nanoflower layered structure and a large specific surface area, so that light is reflected and absorbed again on the surface of the fabric, thereby minimizing energy loss and further improving the light absorption capacity. The structural synergy of the 3D honeycomb fabric with a periodic concave array structure and the photocatalytic micro-nanoparticles with a microscopic nanoflower layered structure makes the dual-function honeycomb fabric material with synergistic photothermal evaporation and photocatalysis prepared by the present invention have excellent light absorption capacity, achieving structural synergy.

[0014] The photocatalytic micro-nanoparticle material selected by the present invention has a strong degradation effect on water pollutants. At the same time, the photocatalytic micro-nanoparticle material of the present invention generates photogenerated carriers under the irradiation of light. The excellent light absorption ability synergistically generated by the concave array of the 3D honeycomb fabric and the photocatalytic micro-nanoparticles with a microscopic nanoflower layered structure can provide kinetic energy for the transmission of photogenerated carriers, and then react with water to generate superoxide radicals and hydroxyl radicals, further promoting the photocatalytic degradation of polluting components. The catalytic degradation effect of the photocatalytic micro-nanoparticle material itself and the catalytic degradation effect of the photogenerated carriers generated under light on water are synergistic in performance, so that the dual-function honeycomb fabric material prepared by the present invention has excellent photocatalytic degradation ability. Under the irradiation of sunlight, heat is generated by the photothermal conversion surface of the fabric to promote water evaporation, and at the same time, organic pollutants are transported to the fabric along with water for photothermal catalytic degradation, thereby achieving the degradation of organic pollutants in organically polluted water and the acquisition of clean water.

[0015] Preferably, in step (1), the honeycomb fabric is a 3D honeycomb fabric having a periodic concave array structure with a side length of 10*8 mm and a depth of 8 mm.

[0016] The 3D honeycomb fabric selected in this invention has a large specific surface area and high porosity, enabling efficient water transport and excellent air permeability, facilitating the effective diffusion of vapor. Furthermore, the periodic concave array structure on the surface of the 3D honeycomb fabric enables multiple light reflections, resulting in excellent light absorption. Furthermore, the integrated and stable structure of the 3D honeycomb fabric facilitates subsequent control over the loading of photocatalytic micro-nanoparticles on the surface of the honeycomb fabric material, further enhancing the photocatalytic capacity of the micro-nanomaterial.

[0017] Preferably, in step (1), the volume ratio of ethanol to water in the ethanol aqueous solution is 1:1-3:1, and the ultrasonic treatment time is 30 min-1 h.

[0018] Preferably, in step (1), the solute in the solution of the compound containing a catechol group is one of o-methoxyphenol, 3,4-dihydroxyphenylalanine, dopamine and its derivatives, the solvent is tris-hydrochloric acid buffer solution (Tris-HCl buffer solution), and the pH of the tris-hydrochloric acid buffer solution is 8-8.5.

[0019] Preferably, in step (1), the concentration of the solution of the compound containing a catechol group is 1-100 mmol / L.

[0020] More preferably, in step (1), the solute in the solution of the compound containing a catechol group is dopamine, and the concentration of the dopamine solution is 1-100 mmol / L.

[0021] Preferably, in step (1), the in-situ self-polymerization reaction time is 3-12 hours.

[0022] Dopamine is a key functional element of adhesive proteins secreted by mussels and other marine organisms. It can polymerize on almost any surface to form a polydopamine layer. Dopamine is rich in catechol and amine functional groups. As an adhesive, it can have strong adhesion to the fabric surface, enhance the bonding force between the photothermal material and the fabric, and improve the stability of the photothermal material on the substrate.

[0023] Preferably, in step (2), the oxidizing solution is one or both of ferric chloride solution and ammonium persulfate solution.

[0024] Preferably, in step (2), the concentration of the oxidizing solution is 0.1-1 mol / L, and the honeycomb fabric A is immersed in the oxidizing solution for 30 min-1 h.

[0025] More preferably, in step (2), the oxidizing solution is a ferric chloride solution, the concentration of the ferric chloride solution is 0.1-1 mol / L, and the honeycomb fabric A is immersed in the ferric chloride solution for 30 min-1 h.

[0026] The honeycomb fabric A is immersed in a ferric chloride solution. The ferric chloride serves as an oxidant, which can subsequently trigger an in-situ oxidative polymerization reaction of compound monomers with photothermal conversion properties on the fabric surface, thereby preparing the honeycomb fabric B.

[0027] Preferably, in step (2), the solute in the compound solution having photothermal conversion performance is one of pyrrole, N-vinylpyrrole, 3-pentanoylpyrrole or 3-dodecanoylpyrrole, and the solvent is one of chloroform or dichloromethane.

[0028] Preferably, the concentration of the compound solution having photothermal conversion performance is 0.1-1 mol / L.

[0029] More preferably, in step (2), the solute in the compound solution having photothermal conversion performance is pyrrole, the solvent is chloroform, and the concentration of the pyrrole solution is 0.1-1 mol / L.

[0030] Preferably, in step (2), the temperature of the in-situ oxidative polymerization reaction is 10-30° C., and the time is 2-6 hours.

[0031] Pyrrole monomers undergo in-situ oxidative polymerization on the fabric surface to form polypyrrole. As a black conductive polymer, polypyrrole has a stable structure, excellent light absorption capacity and outstanding photothermal conversion ability in the full spectrum range. It can convert incident photons into heat through non-radiative relaxation and molecular vibration. It has a controllable structure and can be stably bonded to the base material.

[0032] Preferably, in step (3), the concentration of the sodium polyacrylate solution is 0.1-2 g / L.

[0033] Preferably, in step (3), the immersion temperature is 10-30° C. and the immersion time is 5-10 min.

[0034] Preferably, in step (3), the nanoparticle dispersion with photocatalytic properties is a hydrotalcite dispersion, the hydrotalcite in the hydrotalcite dispersion is one of nickel-iron hydrotalcite, cobalt-iron hydrotalcite or zinc-iron hydrotalcite, and the solvent is one or more of water, ethanol, ethylene glycol or glycerol.

[0035] As a layered double hydroxide, hydrotalcite is widely used in catalysis and other fields due to its adjustable structural composition, large specific surface area, and stable chemical properties. Sodium polyacrylate can better combine hydrotalcite with the base material through electrostatic interaction.

[0036] Preferably, in step (3), the concentration of the hydrotalcite dispersion is 1-5 mg / mL.

[0037] More preferably, in step (3), the hydrotalcite in the hydrotalcite dispersion is nickel-iron hydrotalcite, the solvent is water, and the concentration of the nickel-iron hydrotalcite dispersion is 1-5 mg / mL.

[0038] Preferably, the hydrotalcite in the hydrotalcite dispersion has a rod-like, spherical or fibrous morphology. More preferably, the hydrotalcite has a spherical morphology to increase the surface area.

[0039] Preferably, in step (3), the loading amount of hydrotalcite on the dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis is 5-25 mg.

[0040] More preferably, in step (3), the loading amount of hydrotalcite on the said dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis is 15-20 mg. The dual-functional honeycomb fabric with such a loading amount of hydrotalcite has both high photothermal evaporation rate and pollutant degradation ability.

[0041] Preferably, in steps (1)-(3), the drying temperature is 30-70°C and the drying time is 1-3 hours.

[0042] The present invention also provides a dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis, prepared by the aforementioned method. This dual-functional honeycomb fabric material has a periodic concave array structure, loaded with materials exhibiting both photothermal conversion and photocatalytic properties. This material can achieve multiple reflections of light and exhibits excellent light absorption and photocatalytic degradation capabilities.

[0043] Preferably, the dual-functional honeycomb fabric material for photothermal evaporation and photocatalysis has a periodic concave array structure with a side length of 10*8mm and a depth of 8mm. This structure of the dual-functional honeycomb fabric material for photothermal evaporation and photocatalysis can achieve multiple reflections of light, further improving light absorption capacity.

[0044] The present invention also provides applications of the aforementioned dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis in solar thermal water production and wastewater degradation. The dual-functional honeycomb fabric material has excellent light absorption and photocatalytic degradation capabilities, and has promising application prospects in these areas.

[0045] The dual-function honeycomb fabric material of the present invention, which combines photothermal evaporation and photocatalysis, has a wide spectral absorption range (250nm-2500nm), a light absorption greater than 96%, a photothermal conversion performance greater than 90%, and an evaporation rate of water not less than 1.85kg / (m 2 *h), has broad application prospects in the field of solar thermal water production.

[0046] The dual-function honeycomb fabric material of the present invention, which cooperates with photothermal evaporation and photocatalysis, has a catalytic degradation rate of more than 90% for various water pollutants and is suitable for the field of sewage degradation.

[0047] Preferably, the dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis is used in a mixed system for degrading one or more of tetracycline, oxytetracycline, methylene blue, phenol, and rhodamine.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] (1) The present invention provides a method for preparing a dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis. The method prepares a dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis by in-situ polymerization of photothermal materials and in-situ deposition of photocatalytic micro-nanoparticle materials on the surface of a 3D self-supporting honeycomb fabric. The present invention solves the key scientific and technical problem that photothermal evaporation and photocatalytic performance cannot effectively achieve functional and structural synergy during interfacial evaporation, and provides an effective solution for stable and continuous solar thermal water production in actual complex water bodies. The method of the present invention is simple and can achieve large-scale continuous preparation. It has low requirements for equipment and environment and has broad prospects for industrial application.

[0050] (2) The dual-function honeycomb fabric material for photothermal evaporation and photocatalysis prepared by the present invention realizes multiple reflections and absorptions of light through the periodic concave array structure of the honeycomb fabric and the layered structure of the hydrotalcite micro-nanoflower, thereby minimizing energy loss. The prepared dual-function honeycomb fabric material for photothermal evaporation and photocatalysis can capture and absorb light excellently, has a wide spectral absorption range (250nm-2500nm), a light absorption degree greater than 96%, a photothermal conversion performance greater than 90%, and an evaporation rate of water not less than 1.85kg / (m 2 *h), providing powerful conditions for the acquisition of actual freshwater resources, and having broad application prospects in the field of solar thermal water production.

[0051] (3) The hydrotalcite in the dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis prepared by the present invention generates photogenerated carriers under the irradiation of light. At the same time, the excellent light absorption capacity of the dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis of the present invention provides kinetic energy for the transmission of photogenerated carriers, which then react with water to generate superoxide radicals and hydroxyl radicals, which synergize with the catalytic degradation of the hydrotalcite itself, giving the dual-functional honeycomb fabric material excellent photocatalytic performance and achieving photocatalytic degradation of various pollutants. The dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis of the present invention has a catalytic degradation rate of more than 90% for various pollutants and has good application prospects in the field of sewage degradation. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0053] Figure 1 The digital images of different honeycomb fabrics in Example 1, Figure 1a is a digital image of the original honeycomb fabric; Figure 1 b is a digital image of polydopamine honeycomb fabric; Figure 1 c is a digital image of polypyrrole honeycomb fabric; Figure 1 d is a digital image of a dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis.

[0054] Figure 2 is a scanning electron microscope image of different honeycomb fabrics in Example 1, wherein Figure 2 a is a scanning electron microscope image of the original honeycomb fabric; Figure 2 b is a scanning electron microscope image of polydopamine honeycomb fabric; Figure 2 c is a scanning electron microscope image of polypyrrole honeycomb fabric; Figure 2 d is a scanning electron microscope image of the dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis.

[0055] Figure 3 The contact angle test diagram of different honeycomb fabrics in Example 1, where Figure 3 a is the contact angle test diagram of honeycomb fabric; Figure 3 b is the contact angle test diagram of the dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis.

[0056] Figure 4 These are UV-visible-infrared spectra of the honeycomb fabric in Example 1 and the dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis.

[0057] Figure 5 These are Fourier infrared images of the honeycomb fabric in Example 1 and the dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis.

[0058] Figure 6 This is a graph showing the change in water evaporation mass over time of the dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis in Example 1 and Example 3 at different nickel-iron hydrotalcite loadings.

[0059] Figure 7 Graph showing the catalytic degradation rates of the dual-functional honeycomb fabric materials with photothermal evaporation and photocatalysis synergistically at different nickel-iron hydrotalcite loadings in Examples 1 and 3.

[0060] Figure 8 Graph showing the change in water evaporation mass over time for different honeycomb fabrics in Example 2, Comparative Example 1 and Comparative Example 2. DETAILED DESCRIPTION

[0061] In view of the shortcomings of the prior art, the inventors of this case, after long-term research and extensive practice, have proposed the technical solution of the present invention. The technical solution of the present invention will be clearly and completely described below. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making any creative effort shall fall within the scope of protection of the present invention.

[0062] The steps for preparing the dual-functional honeycomb fabric material of photothermal evaporation and photocatalysis synergistically in the embodiment of the present invention are as follows:

[0063] (1) After ultrasonic treatment of a honeycomb fabric with an ethanol aqueous solution, the fabric was immersed in a dopamine-tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution to undergo in-situ self-polymerization reaction, and then dried to obtain a honeycomb fabric A, i.e., a polydopamine honeycomb fabric;

[0064] (2) immersing the polydopamine honeycomb fabric in a ferric chloride solution and then in a pyrrole solution to perform an in-situ oxidative polymerization reaction, and drying to obtain a honeycomb fabric B, i.e., a polypyrrole honeycomb fabric;

[0065] (3) The polypyrrole honeycomb fabric is immersed in a sodium polyacrylate solution and then placed in an oven for drying to obtain a polypyrrole honeycomb fabric impregnated with sodium polyacrylate. The hydrotalcite nanoflower aqueous solution is in situ deposited on the polypyrrole honeycomb fabric impregnated with the sodium polyacrylate solution and dried to obtain a dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis.

[0066] Example 1

[0067] The steps for preparing the dual-functional honeycomb fabric material of photothermal evaporation and photocatalysis synergy in this embodiment are as follows:

[0068] (1) First, a 0.1 mol / L Tris-HCl solution was prepared. The solution was then ultrasonically mixed with water to obtain a Tris-HCl buffer solution with a pH of 8.5. The honeycomb fabric was ultrasonically treated with a 1:1 ethanol-water solution by volume for 30 min and then immersed in a 10 mmol / L dopamine-Tris-HCl buffer solution for in-situ polymerization for 12 h. After the reaction, the honeycomb fabric was removed and dried in a 60°C oven for 1 h to obtain a polydopamine honeycomb fabric.

[0069] (2) The polydopamine honeycomb fabric was immersed in a 0.5 mol / L ferric chloride solution for 30 min, and then immersed in a 0.2 mol / L pyrrole solution with chloroform as the solvent to perform in situ oxidative polymerization for 3 h. After the reaction, the honeycomb fabric was taken out and placed in an oven at 60°C for 1 h to obtain a polypyrrole honeycomb fabric.

[0070] (3) The polypyrrole honeycomb fabric was immersed in a 1 g / L sodium polyacrylate solution for 5 minutes and dried to obtain a polypyrrole honeycomb fabric impregnated with the sodium polyacrylate solution. 4 ml of a 5 mg / ml nickel-iron hydrotalcite nanoflower aqueous solution was sprayed on the polypyrrole honeycomb fabric impregnated with the sodium acrylate solution, and the fabric was placed in an oven at 60 ° C and dried for 1 hour to obtain a dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis.

[0071] The microstructure, contact angle, absorbance, evaporation performance and catalytic performance of the obtained dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis were characterized and tested. Figure 1 a. Figure 1 b. Figure 1 c and Figure 1 d are digital images of the honeycomb fabric of this embodiment, polydopamine honeycomb fabric, polypyrrole honeycomb fabric, and the dual-functional honeycomb fabric of photothermal evaporation and photocatalysis. On a macro scale, it can be seen that the four fabrics have obvious color changes: the honeycomb fabric is white, the polydopamine honeycomb fabric is yellow, the polypyrrole honeycomb fabric is black, and the dual-functional honeycomb fabric of photothermal evaporation and photocatalysis is still black.

[0072] Figure 2 a. Figure 2 b. Figure 2 c and Figure 2 d are scanning electron micrographs of the honeycomb fabric of this example, a polydopamine honeycomb fabric, a polypyrrole honeycomb fabric, and a dual-function honeycomb fabric with synergistic photothermal evaporation and photocatalysis. It can be seen that the honeycomb fabrics have smooth surfaces, the polydopamine honeycomb fabric has uniformly polymerized surfaces, the polypyrrole fabric has uniformly polymerized surfaces with increased surface roughness, and the dual-function honeycomb fabric with synergistic photothermal evaporation and photocatalysis has uniformly dispersed hydrotalcite.

[0073] Figure 3 a is a contact angle test diagram of the honeycomb fabric of this embodiment, Figure 3 b is the contact angle test diagram of the dual-functional honeycomb fabric with photothermal evaporation and photocatalysis prepared in this embodiment. Figure 3 a and Figure 3 b It can be seen that the method of this embodiment is used to prepare a hydrophilic dual-functional honeycomb fabric with synergistic photothermal evaporation and photocatalysis from a hydrophobic honeycomb fabric.

[0074] Figure 4 This is the UV-visible-infrared spectrum of the dual-functional honeycomb fabric with photothermal evaporation and photocatalysis prepared in this example. Figure 4 It can be seen that the absorbance of the dual-functional honeycomb fabric with synergistic photothermal evaporation and photocatalysis prepared in this embodiment is 96%. Figure 5 This is the Fourier infrared image of the dual-functional honeycomb fabric with photothermal evaporation and photocatalysis prepared in this example. Figure 5It can be seen that the infrared emissivity of the dual-functional honeycomb fabric for photothermal evaporation and photocatalysis prepared in this embodiment is 98%, and its photothermal conversion efficiency is calculated to be 92.87%.

[0075] Figure 6 The water evaporation mass of the dual-functional honeycomb fabric prepared in this embodiment changes over time. Specifically, the dual-functional honeycomb fabric prepared in this embodiment is placed on polystyrene foam wrapped with hydrophilic non-woven fabric to construct a photothermal evaporator. The fabric is placed on an electronic balance and the evaporation test is performed on the fabric. Under one sun, the evaporation rate is 2.01 kg / (m 2 *h).

[0076] Figure 7 This is a graph showing the catalytic degradation rate of tetracycline by the dual-functional honeycomb fabric with synergistic photothermal evaporation and photocatalysis prepared in this example. In a catalytic degradation test of tetracycline, the catalytic degradation rate was 91.7% under one sun.

[0077] Example 2

[0078] (1) First, a 0.1 mol / L Tris-HCl solution was prepared. The solution was then ultrasonically mixed with water to obtain a Tris-HCl buffer solution with a pH of 8.5. The honeycomb fabric was ultrasonically treated with a 1:1 ethanol-water solution by volume for 30 min and then immersed in a 10 mmol / L dopamine-Tris-HCl buffer solution for in-situ polymerization for 12 h. After the reaction, the honeycomb fabric was removed and dried in a 60°C oven for 1 h to obtain a polydopamine honeycomb fabric.

[0079] (2) The polydopamine honeycomb fabric was immersed in a 0.5 mol / L ferric chloride solution for 30 min, and then immersed in a 0.2 mol / L pyrrole solution with chloroform as the solvent to perform in situ oxidative polymerization. The in situ oxidative polymerization reaction times were 30 min, 1 h, 2 h, 3 h, 6 h, 12 h, and 24 h, respectively. After the reaction, the honeycomb fabric was taken out and placed in an oven at 60 ° C for 1 h to obtain a polypyrrole honeycomb fabric.

[0080] This example investigates the effect of different in-situ oxidative polymerization reaction times on the water evaporation quality of polypyrrole honeycomb fabrics. The prepared polypyrrole honeycomb fabrics were placed on polystyrene foam wrapped with hydrophilic non-woven fabrics, and a photothermal evaporator was constructed. The fabrics were placed on an electronic balance and subjected to evaporation tests. Under one sun, the evaporation rates were 1.40, 1.52, 1.70, 1.74, 1.71, 1.67, and 1.63 kg / (m 2*h), this is because appropriate reaction time (2h, 3h, 6h) can make pyrrole polymerize evenly, too short reaction time (30min, 1h) makes the reaction incomplete, and too long reaction time (12h, 24h) will cause plaques to fall off.

[0081] The evaporation rate of the polypyrrole honeycomb fabric prepared in this embodiment when the oxidative polymerization reaction time is 3 hours is 1.74 kg / (m 2 *h)), which is much lower than the dual-functional honeycomb fabric (2.01kg / (m 2 *h)), which shows that the addition of nickel-iron hydrotalcite nanoflower aqueous solution increases the evaporation rate of the honeycomb fabric, confirming the structural synergistic effect between nickel-iron hydrotalcite and honeycomb fabric.

[0082] Example 3

[0083] (1) First, a 0.1 mol / L Tris-HCl solution was prepared. The solution was then ultrasonically mixed with water to obtain a Tris-HCl buffer solution with a pH of 8.5. The honeycomb fabric was ultrasonically treated with a 1:1 ethanol-water solution by volume for 30 min and then immersed in a 10 mmol / L dopamine-Tris-HCl buffer solution for in-situ polymerization for 12 h. After the reaction, the honeycomb fabric was removed and dried in a 60°C oven for 1 h to obtain a polydopamine honeycomb fabric.

[0084] (2) The polydopamine honeycomb fabric was immersed in a 0.5 mol / L ferric chloride solution for 30 min, and then immersed in a 0.2 mol / L pyrrole solution with chloroform as the solvent to carry out in situ oxidative polymerization for 3 h. After the reaction, the honeycomb fabric was taken out and placed in a 60°C oven to dry for 1 h to obtain a polypyrrole honeycomb fabric.

[0085] (3) The polypyrrole honeycomb fabric was immersed in a 1g / L sodium polyacrylate solution for 5 minutes and dried to obtain a polypyrrole honeycomb fabric impregnated with the sodium polyacrylate solution. Aqueous solutions containing 0mg, 5mg, 10mg, 15mg, 20mg, and 25mg of nickel-iron hydrotalcite nanoflowers were sprayed onto the polypyrrole honeycomb fabric impregnated with the sodium polyacrylate solution, and the fabric was dried in a 60°C oven for 1 hour to obtain a dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis.

[0086] The dual-functional honeycomb fabric with photothermal evaporation and photocatalysis prepared in this example was placed on polystyrene foam wrapped with hydrophilic non-woven fabric to construct a photothermal evaporator. The fabric was placed on an electronic balance to perform an evaporation test. Under one sun, the evaporation rate of the dual-functional honeycomb fabric with photothermal evaporation and photocatalysis prepared in this example was as follows: Figure 6As shown, they are 1.74, 1.86, 1.89, 2.00, 2.01, 1.96 kg / (m 2 *h), the water evaporation mass first increases and then decreases with the increase of nickel-iron hydrotalcite loading. This is because loading an appropriate amount of hydrotalcite can increase the roughness of the fabric surface, effectively recovering heat loss due to convection and radiation, thereby improving the photothermal conversion efficiency and photothermal evaporation rate, and achieving performance improvement. Catalytic degradation tests were conducted on the dual-functional honeycomb fabrics with photothermal evaporation and photocatalytic synergy loaded with 10mg, 15mg, and 20mg of nickel-iron hydrotalcite. In this example, tetracycline was used as an example, and the catalytic degradation rates of the dual-functional honeycomb fabrics with photothermal evaporation and photocatalytic synergy were as follows: Figure 7 As shown, the dual-functional honeycomb fabrics with photothermal evaporation and photocatalytic synergy with hydrotalcite loading of 76.6%, 82.7%, 91.7% and 15-20 mg respectively achieved high evaporation efficiency and excellent pollutant degradation ability.

[0087] Example 4

[0088] (1) First, a 0.1 mol / L Tris-HCl solution was prepared. The solution was then ultrasonically mixed with water to obtain a Tris-HCl buffer solution with a pH of 8.5. The honeycomb fabric was ultrasonically treated with a 1:1 ethanol-water solution by volume for 30 min and then immersed in a 10 mmol / L dopamine-Tris-HCl buffer solution for in-situ polymerization for 12 h. After the reaction, the honeycomb fabric was removed and dried in a 60°C oven for 1 h to obtain a polydopamine honeycomb fabric.

[0089] (2) The polydopamine honeycomb fabric was immersed in a 0.5 mol / L ferric chloride solution for 30 min, and then immersed in a 0.2 mol / L pyrrole solution with chloroform as the solvent to carry out in situ oxidative polymerization for 3 h. After the reaction, the honeycomb fabric was taken out and placed in a 60°C oven to dry for 1 h to obtain a polypyrrole honeycomb fabric.

[0090] (3) The polypyrrole honeycomb fabric was immersed in a 1 g / L sodium polyacrylate solution for 5 minutes and dried to obtain a polypyrrole honeycomb fabric immersed in sodium acrylate solution. 4 ml of a 5 mg / ml cobalt-iron hydrotalcite nanoflower aqueous solution was sprayed on the polypyrrole honeycomb fabric immersed in sodium acrylate solution, and the fabric was placed in an oven at 60 ° C and dried for 1 hour to obtain a dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis.

[0091] In this example, cobalt-iron hydrotalcite was used to prepare a dual-functional honeycomb fabric material with photothermal evaporation and photocatalysis. The fabric prepared in this example was placed on polystyrene foam wrapped with a hydrophilic non-woven fabric to construct a photothermal evaporator. The fabric was placed on an electronic balance and subjected to an evaporation test. Under one sun, the evaporation rate was 1.97 kg / (m2 *h); A catalytic degradation test was conducted on tetracycline. Under one sun of light, the catalytic degradation rate was 90.3%.

[0092] Example 5

[0093] (1) First, prepare a 0.1 mol / L Tris-HCl solution, dilute to volume with water, and ultrasonically mix to obtain a Tris-HCl buffer solution with a pH of 8.5. After ultrasonicating the honeycomb fabric with a volume ratio of 1:1 ethanol-water solution for 30 minutes, immerse it in a 10 mmol / L dopamine-Tris-HCl buffer solution and perform in-situ self-polymerization for 12 hours. After the reaction is completed, remove the honeycomb fabric and dry it in a 60°C oven for 1 hour to obtain a polydopamine honeycomb fabric.

[0094] (2) The polydopamine honeycomb fabric was immersed in a 0.5 mol / L ferric chloride solution for 30 min, and then immersed in a 0.2 mol / L pyrrole solution with chloroform as the solvent to carry out in situ oxidative polymerization for 3 h. After the reaction, the honeycomb fabric was taken out and placed in a 60°C oven to dry for 1 h to obtain a polypyrrole honeycomb fabric.

[0095] (3) The polypyrrole honeycomb fabric was immersed in a 1 g / L sodium polyacrylate solution for 5 minutes and dried to obtain a polypyrrole honeycomb fabric impregnated with the sodium acrylate solution. 4 ml of a 5 mg / ml zinc-iron hydrotalcite nanoflower aqueous solution was sprayed on the polypyrrole honeycomb fabric impregnated with the sodium acrylate solution, and the fabric was placed in an oven at 60°C and dried for 1 hour to obtain a dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis.

[0096] In this example, zinc-iron hydrotalcite was used to prepare a dual-functional honeycomb fabric material with photothermal evaporation and photocatalysis. The fabric prepared in this example was placed on polystyrene foam wrapped with a hydrophilic non-woven fabric to construct a photothermal evaporator. The fabric was placed on an electronic balance and subjected to an evaporation test. Under one sun, the evaporation rate was 1.97 kg / (m 2 *h); A catalytic degradation test was conducted on tetracycline. Under one sun of light, the catalytic degradation rate was 84.6%.

[0097] Comparative Example 1

[0098] (1) First, prepare a 0.1 mol / L Tris-HCl solution, add water to the fixed volume, and ultrasonically mix to obtain a Tris-HCl buffer solution with a pH of 8.5. After ultrasonic treatment of the flat fabric with a volume ratio of 1:1 ethanol-water solution for 30 minutes, the flat fabric was immersed in a 10 mmol / L dopamine-Tris-HCl buffer solution and subjected to in-situ self-polymerization for 12 hours. After the reaction, the flat fabric was removed and dried in a 60°C oven for 1 hour to obtain a polydopamine flat fabric.

[0099] (2) The polydopamine planar fabric was immersed in a 0.5 mol / L ferric chloride solution for 30 min, and then immersed in a 0.2 mol / L pyrrole solution with chloroform as the solvent to perform an in-situ oxidative polymerization reaction for 3 h. After the reaction, the planar fabric was taken out and placed in a 60° C. oven for drying for 1 h to obtain a polypyrrole planar fabric.

[0100] The polypyrrole flat fabric prepared in this comparative example was placed on polystyrene foam wrapped with hydrophilic non-woven fabric, and a photothermal evaporator was constructed. The evaporation test was performed on the fabric on an electronic balance. Under one sun, the evaporation rate was as follows: Figure 8 As shown, it is 1.33kg / (m 2 *h), compared with honeycomb fabrics, the water evaporation efficiency of flat fabrics of the same thickness is significantly reduced, proving that the concave array structure of honeycomb fabrics has a certain ability to capture and absorb light, effectively reducing energy loss.

[0101] Comparative Example 2

[0102] First, a 0.1 mol / L Tris-HCl solution was prepared. Water was added to the solution and ultrasonically mixed to obtain a Tris-HCl buffer solution with a pH of 8.5. The honeycomb fabric was then ultrasonically treated with a 1:1 ethanol-water solution by volume for 30 minutes. The fabric was then immersed in a 10 mmol / L dopamine-Tris-HCl buffer solution for in-situ polymerization for 12 hours. After the reaction, the fabric was removed and dried in a 60°C oven for 1 hour to obtain a polydopamine honeycomb fabric.

[0103] The polydopamine honeycomb fabric prepared in this comparative example was placed on polystyrene foam wrapped with hydrophilic non-woven fabric, and a photothermal evaporator was constructed and placed on an electronic balance to perform an evaporation test on the fabric. Under one sun, the evaporation rate was as follows: Figure 8 As shown, it is 1.16kg / (m 2 *h), compared with polypyrrole honeycomb fabric, the light-heat absorption and conversion capacity of polydopamine honeycomb fabric is lower than that of polypyrrole honeycomb fabric.

[0104] Comparative Example 3

[0105] (1) First, prepare a 0.1 mol / L Tris-HCl solution, dilute to volume with water, and ultrasonically mix to obtain a Tris-HCl buffer solution with a pH of 8.5. After ultrasonicating the honeycomb fabric with a volume ratio of 1:1 ethanol-water solution for 30 minutes, immerse it in a 10 mmol / L dopamine-Tris-HCl buffer solution and perform in-situ self-polymerization for 12 hours. After the reaction is completed, remove the honeycomb fabric and dry it in a 60°C oven for 1 hour to obtain a polydopamine honeycomb fabric.

[0106] (2) The polydopamine honeycomb fabric was immersed in a 0.5 mol / L ferric chloride solution for 30 min, and then immersed in a 0.2 mol / L pyrrole solution with chloroform as the solvent to carry out in situ oxidative polymerization for 3 h. After the reaction, the honeycomb fabric was taken out and placed in a 60°C oven to dry for 1 h to obtain a polypyrrole honeycomb fabric.

[0107] (3) 4 ml of 5 mg / ml nickel-iron hydrotalcite nanoflower aqueous solution was directly sprayed on the polypyrrole honeycomb fabric impregnated with sodium polyacrylate solution, and placed in a 60 ° C oven for 1 h to obtain a dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis.

[0108] This comparative example investigates the effect of a sodium polyacrylate solution on the performance of a prepared bifunctional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis. The hydrotalcite in this bifunctional honeycomb fabric material exhibits weak interaction with the honeycomb fabric, resulting in easy detachment and precluding quantitative performance testing.

[0109] It should be noted that the specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for preparing a dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis, characterized in that: The following steps are involved: (1) The honeycomb fabric is ultrasonically treated with an ethanol aqueous solution and then immersed in a compound solution containing a catechol group to undergo an in-situ self-polymerization reaction, followed by drying to obtain a honeycomb fabric A, wherein the honeycomb fabric is a 3D honeycomb fabric having a periodic concave array structure with a side length of 10*8 mm and a depth of 8 mm, the solute in the compound solution containing a catechol group is dopamine, the concentration of the dopamine solution is 1-100 mmol / L, and the in-situ self-polymerization reaction time is 3-12 h; (2) Immersing honeycomb fabric A in an oxidizing solution, and then in a compound solution having photothermal conversion properties, performing an in-situ oxidative polymerization reaction, and drying to obtain honeycomb fabric B, wherein the solute in the compound solution having photothermal conversion properties is pyrrole, the solvent is chloroform, the concentration of the pyrrole solution is 0.1-1 mol / L, the temperature of the in-situ oxidative polymerization reaction is 10-30°C, and the time is 2-6 hours; (3) The honeycomb fabric B is immersed in a sodium polyacrylate solution and dried to obtain a honeycomb fabric B immersed in the sodium polyacrylate solution. Then, a nanoparticle dispersion with photocatalytic properties is in situ deposited on the honeycomb fabric B immersed in the sodium polyacrylate solution, wherein the nanoparticle dispersion with photocatalytic properties is a hydrotalcite dispersion, the hydrotalcite in the hydrotalcite dispersion is one of nickel-iron hydrotalcite, cobalt-iron hydrotalcite or zinc-iron hydrotalcite, the solvent is one or more of water, ethanol, ethylene glycol or propylene glycol, the concentration of the hydrotalcite dispersion is 1-5 mg / mL, and the morphology of the hydrotalcite in the hydrotalcite dispersion is rod-shaped, spherical or fibrous. After drying, a dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis is obtained.

2. The preparation method according to claim 1, characterized in that In step (3), the concentration of the sodium polyacrylate solution is 0.1-2 g / L, the immersion temperature is 10-30° C., and the immersion time is 5-10 min.

3. The preparation method according to claim 1, characterized in that In step (3), the loading amount of hydrotalcite on the dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis is 5-25 mg.

4. A dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis prepared by the preparation method according to any one of claims 1 to 3.

5. Application of the dual-functional honeycomb fabric material with synergistic photothermal evaporation and photocatalysis according to claim 4 in the fields of solar thermal water production and sewage degradation.

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