Solar-driven interface water evaporation and photocatalytic dye degradation bifunctionalized composite fiber membrane and preparation method and application thereof

Abstract

The application belongs to the technical field of polymer composite materials, and relates to a solar-driven interface water evaporation and photocatalytic dye degradation bifunctional composite fiber membrane and a preparation method thereof. A polyarylene ether nitrile nanofiber membrane is prepared through an electrostatic spinning technology, polyaniline / titanium dioxide composite nanoparticles are prepared through an in-situ polymerization method, and finally, the polyaniline / titanium dioxide composite nanoparticles are loaded on the surface of the polyarylene ether nitrile fiber membrane through a polydopamine-assisted vacuum self-assembly method, so as to obtain a polyaniline / titanium dioxide / polyarylene ether nitrile composite fiber membrane. The prepared polyaniline / titanium dioxide / polyarylene ether nitrile composite fiber membrane has a high evaporation rate and a good dye removal rate, and has a wide application prospect in water resource purification and industrial wastewater treatment.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of polymer composites, and relates to a solar-driven interface water evaporation and photocatalytic dye degradation bifunctional composite fiber membrane, a preparation method thereof and application of the composite fiber membrane in water resource purification and dye-containing industrial wastewater treatment. BACKGROUND

[0002] Water resources are the basis for the survival of life on earth and an indispensable condition for the development of human society. However, insufficient fresh water resources and aggravated water pollution not only cause pollution to the social environment, but also cause serious harm to human health. Developing efficient and energy-saving technologies to separate pure fresh water from seawater or wastewater is one of the preferred solutions to solve this problem and is also a frontier research field that is focused on worldwide. In water treatment technologies, solar-driven interface water evaporation technology, as an advanced water treatment strategy that has emerged in recent years, has attracted widespread research and attention.

[0003] Solar-driven interface water evaporation technology is a technology that uses solar energy as an energy source, a photothermal conversion material as a core component, absorbs solar energy, and converts it into heat energy through the photothermal material, thereby accelerating water evaporation. This technology is usually used for desalination to extract pure water from seawater and for wastewater treatment. At present, the photothermal layer based on membrane materials is widely used in this technical field. Existing research mainly focuses on the modification of the substrate component and the photothermal conversion component of the photothermal layer to improve the evaporation efficiency and conduct multifunctional research. When the solar-driven interface water evaporation technology is used for industrial wastewater treatment, pollutants will concentrate in the water, thereby causing secondary pollution to water resources. For dye-containing industrial wastewater, using photocatalytic materials to degrade dyes to achieve wastewater purification is one of the common water treatment methods. Therefore, it is necessary to develop a material that realizes bifunctionalization with the aid of photothermal conversion materials and photocatalytic materials, so as to achieve the purpose of efficient water purification and long-term use of the membrane material in dye-containing industrial wastewater.

[0004] At present, the substrate commonly used for loading photothermal conversion materials and photocatalytic materials is usually a thin film and a block material prepared based on polymers, such as polyvinyl alcohol, cellulose triacetate and lignocellulose. Polyarylene ether nitrile (PEN) is a new special polymer material that has excellent thermal stability, corrosion resistance, oxidation stability, good mechanical properties and electrospinning processing forming performance. Electrospinning is an advanced fiber manufacturing process, and the nanofibers produced by this process have a high specific surface area and adjustable porosity. Therefore, PEN is electrospun to prepare a fiber membrane with excellent performance, which can provide a good substrate material for subsequent bifunctional modification, and its excellent performance can further ensure the long-term use of the composite fiber membrane in water treatment environments. SUMMARY

[0005] Therefore, the solar energy driven interfacial water evaporation and photocatalytic dye degradation bifunctional composite fiber membrane is disclosed to improve the problem of freshwater resource shortage, thereby avoiding secondary pollution of water resources and effectively improving the sewage treatment efficiency.

[0006] It should be noted that, in order to ensure the bifunctionalization of the composite fiber membrane, the surface of the fiber membrane is modified by using polydopamine, and then the polyaniline@titanium dioxide composite nanoparticles are loaded on the surface of the fiber membrane by using a vacuum self-assembly method, so that the composite fiber membrane has a high interfacial water evaporation rate and an excellent dye removal rate when treating dye wastewater, wherein the dye removal rate represents the adsorption and photocatalytic degradation capacity of the composite fiber membrane, thereby obtaining a solar energy driven interfacial water evaporation and photocatalytic dye degradation bifunctional composite fiber membrane.

[0007] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0008] The first technical purpose of the present application is to provide a solar energy driven interfacial water evaporation and photocatalytic dye degradation bifunctional composite fiber membrane, which is a polyaniline@titanium dioxide / polyarylether nitrile composite fiber membrane, and is prepared by the following steps: preparing a polyarylether nitrile nanofiber membrane by using an electrospinning technology; preparing polyaniline@titanium dioxide composite nanoparticles by using an in-situ polymerization method; and loading the polyaniline@titanium dioxide composite nanoparticles on the surface of the polyarylether nitrile nanofiber membrane by using a polydopamine assisted vacuum self-assembly method to perform bifunctional modification, thereby obtaining the polyaniline@titanium dioxide / polyarylether nitrile composite fiber membrane.

[0009] Specifically, the present application specifically discloses a polyaniline@titanium dioxide / polyarylether nitrile (PANI@TiO2 / PEN) composite fiber membrane which is prepared by using a polyarylether nitrile nanofiber membrane as a substrate and loading bifunctional nanoparticles polyaniline@titanium dioxide by using a polydopamine assisted vacuum self-assembly method, and has a high interfacial water evaporation rate and an excellent dye removal rate when treating dye wastewater, thereby realizing efficient sewage treatment and avoiding secondary pollution of water resources, and can be applied in the field of industrial dye wastewater purification.

[0010] The second technical purpose of the present application is to provide a preparation method of a solar energy driven interfacial water evaporation and photocatalytic dye degradation bifunctional composite fiber membrane, which specifically includes the following steps:

[0011] Step (1) preparing a nanofiber membrane by using an electrospinning technology:

[0012] The polyarylether nitrile is dissolved in an organic solvent to prepare a polyarylether nitrile solution, and then a polyarylether nitrile nanofiber membrane is prepared by using an electrospinning technology;

[0013] Step (2) preparation of polyaniline@titanium dioxide composite nanoparticles: polyaniline@titanium dioxide composite nanoparticles were prepared by in-situ polymerization;

[0014] Step (3) preparation of bifunctional composite fiber membrane: the polydopamine was used to modify the surface of the polyarylene ether nitrile nanofiber membrane of step (1) due to its strong adhesion; the polyaniline@titanium dioxide composite nanoparticles of step (2) were prepared into a PANI@TiO2 suspension with different concentrations, and the PANI@TiO2 was loaded on the surface of the nanofiber membrane by vacuum self-assembly, followed by drying, to obtain the polyaniline@titanium dioxide / polyarylene ether nitrile (PANI@TiO2 / PEN) composite fiber membrane with different concentrations;

[0015] Preferably, in step (1), 2g of PEN powder was dissolved in 5mL of organic solvent to prepare a polyarylene ether nitrile solution, and the organic solvent was N,N-dimethylformamide (DMF); the electrospinning voltage was 18kV, the pushing speed was 0.0009mm / s, the receiver speed was 300rpm, an aluminum foil was placed on the receiver, and the electrospinning was maintained for 10-12h to prepare the polyarylene ether nitrile nanofiber membrane.

[0016] Preferably, in step (2), the specific operation of preparing polyaniline@titanium dioxide composite nanoparticles by in-situ polymerization was as follows:

[0017] First, a 1.2mol / L hydrochloric acid solution was prepared; 0.1218mL of aniline (ANI) was dissolved in 90mL of the 1.2mol / L hydrochloric acid solution, and then 0.512g of TiO2 was added to obtain a mixed solution A, which was ultrasonically stirred for 30min to ensure uniform mixing; 0.292g of ammonium persulfate (APS) was dissolved in 30mL of the 1.2mol / L hydrochloric acid solution to obtain a mixed solution B; then the B solution was added dropwise into the A solution at a speed of about 1 drop / s, and the ice bath was stirred for 6h, followed by repeated filtration for 3-4 times until the filtrate was neutral to remove excess hydrochloric acid; finally, the obtained dark blue solid was dried in an oven, and the dried dark blue powder was taken out after 24h.

[0018] Preferably, in step (3), the dopamine solid was dissolved in a Tris-HCl buffer (pH=8.5) with a concentration of 0.5-1.5mg / mL, the water bath reaction temperature was 20-30℃, the reaction time was 10-12h, the polyarylene ether nitrile nanofiber membrane was taken out and dried; the concentration of the PANI@TiO2 suspension was 5-100mg / mL; and the concentration of the PANI@TiO2 suspension was specifically preferably 5mg / mL, 10mg / mL, 20mg / mL, 40mg / mL, 60mg / mL, 80mg / mL, or 100mg / mL.

[0019] Compared with the prior art, the solar-driven interface water evaporation and photocatalytic dye degradation double-function composite fiber membrane provided by the application, the preparation method and application thereof have the following excellent effects.

[0020] The polyphenylamine@titanium dioxide / polyarylether nitrile (PANI@TiO2 / PEN) composite fiber membrane prepared by the application has excellent water treatment capacity based on the solar-driven interface evaporation and photocatalytic dye degradation. In the process of treating industrial wastewater containing dyes, not only can the wastewater be purified by evaporation, but also the dye pollutants can be degraded, thereby avoiding secondary pollution of water resources and ensuring high-efficiency wastewater treatment efficiency and long-acting use performance of the composite fiber membrane, which has good application prospect in the field of water treatment.

[0021] The polyphenylamine@titanium dioxide / polyarylether nitrile (PANI@TiO2 / PEN) composite fiber membrane prepared by the application has high evaporation rate (3.23 kg·m -2 h -1 ) and good dye removal rate (92.17%), and has wide application prospect in water purification and industrial wastewater treatment. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0023] Figure 1 is a micro-morphology diagram of the nanofiber membrane surface treated by different concentrations of PANI@TiO2 nanoparticle suspension; Figure 1 a- Figure 1 c are micro-morphology diagrams of the surface of the composite fiber membranes prepared in Examples 1, 3 and 7, respectively.

[0024] Figure 2 is an EDS element mapping diagram of the composite fiber membrane prepared in Example 3; Figure 2 a is a corresponding area measured by EDS element mapping analysis, Figure 2 b is a Ti element diagram of EDS element mapping.

[0025] Figure 3 is a water contact angle test diagram of the fiber membrane, Figure 3 a- Figure 3 c are water contact angle test diagrams of the composite fiber membranes prepared in Comparative Example 1, Comparative Example 3 and Example 3, respectively.

[0026] Figure 4 is the water evaporation rate diagram of the composite fiber membrane prepared in Example 1-7 under the irradiation of sunlight.

[0027] Figure 5 is the diagram of the change of the characteristic peak of the ultraviolet absorption spectrum of the composite fiber membrane prepared in Example 3 in the methylene blue solution with the irradiation time (0-6h). DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0029] Herein, the special word "embodiment" as "exemplary" explained any embodiment does not have to be interpreted as superior or better than other embodiments. In the performance index test in the embodiments of the present application, unless otherwise specified, the conventional test method in the art is adopted. It should be understood that the terms described in the present application are only for describing the specific embodiments, and are not used to limit the disclosure of the present application.

[0030] Unless otherwise specified, the technical and scientific terms used herein have the same meanings as generally understood by those skilled in the art to which the present application belongs; as the test methods and technical means not specially noted in the present application are all the experimental methods and technical means generally used by those skilled in the art.

[0031] In order to better illustrate the content of the present application, a large number of specific details are given in the specific embodiments below. Those skilled in the art should understand that the present application can also be implemented without some specific details. In the embodiments, some methods, means, instruments, equipment and the like which are well known to those skilled in the art are not described in detail, in order to highlight the main idea of the present application.

[0032] The technical features disclosed in the embodiments of the present application can be combined in any way without conflict, and the technical solutions obtained by the combination belong to the disclosure of the embodiments of the present application.

[0033] The embodiments of the present application disclose a preparation method of a polyaniline@titanium dioxide / polyarylether nitrile (PANI@TiO2 / PEN) composite fiber membrane.

[0034] In order to better understand the present application, the present application will be further specifically described by the following embodiments, but it should not be understood as a limitation of the present application. Some non-essential improvements and adjustments made by those skilled in the art according to the above disclosure of the present application are also regarded as falling within the scope of protection of the present application.

[0035] Example 1

[0036] A preparation method of a polydopamine modified polyphenylene ether nitrile (PANI@TiO2 / PEN) composite fiber membrane, specifically as follows:

[0037] Dissolve 2g of PEN powder in 5mL of N,N-dimethylformamide (DMF) organic solvent to prepare a polyphenylene ether nitrile solution, heat and stir for 2h; then, collect the PEN solution with a syringe, place it on an electrospinning machine, and spin at a voltage of 18kV, a pushing speed of 0.0009mm / s, and a receiver speed of 300rpm; then dry in an oven at 80℃ for 24h to obtain a PEN nanofiber membrane; dissolve dopamine solid in Tris-HCl buffer (pH=8.5) at a concentration of 1mg / mL, take it out after constant temperature magnetic stirring at 25℃ for 11h, and dry in an oven at 80℃ for 24h; then load a PANI@TiO2 suspension solution with a concentration of 5mg / mL on the PEN nanofiber membrane using a vacuum self-assembly method, and dry in an oven at 80℃ to obtain a polydopamine modified PANI@TiO2 / PEN composite fiber membrane.

[0038] Examples 2-7

[0039] A preparation method of a polydopamine modified polyphenylene ether nitrile (PANI@TiO2 / PEN) composite fiber membrane, specifically as follows:

[0040] The specific operation method is the same as that of Example 1, and the only difference is the concentration of the PANI@TiO2 suspension solution, which is 10mg / mL, 20mg / mL, 40mg / mL, 60mg / mL, 80mg / mL, and 100mg / mL in Examples 2-7, respectively, so as to obtain PANI@TiO2 / PEN composite fiber membranes prepared from PANI@TiO2 with different concentrations.

[0041] Comparative Example 1

[0042] A preparation method of a polyphenylene ether nitrile nanofiber membrane, specifically as follows:

[0043] Dissolve 2g of PEN powder in 5mL of an organic solvent to prepare a polyphenylene ether nitrile solution, heat and stir for 2h; then, collect the PEN solution with a syringe, place it on an electrospinning machine, and spin; then dry in an oven at 80℃ for 24h, take it out, and obtain a PEN nanofiber membrane.

[0044] Comparative Example 2

[0045] A preparation method of polyaniline@titanium dioxide (PANI@TiO2) composite nanoparticles, specifically as follows:

[0046] First, prepare a 1.2 mol / L hydrochloric acid solution; dissolve 0.1218 mL of aniline (ANI) in 90 mL of the 1.2 mol / L hydrochloric acid solution, then add 0.512 g of TiO2 to obtain a mixed solution A, and ultrasonically stir the solution for 30 minutes to ensure uniform mixing; dissolve 0.292 g of ammonium persulfate (APS) in 30 mL of the 1.2 mol / L hydrochloric acid solution to obtain a mixed solution B; then, drop the B solution into the A solution at a rate of about 1 drop per second, and stir in an ice bath for 6 hours, then repeat the filtration for 3-4 times until the filtrate is neutral to remove excess hydrochloric acid; finally, the obtained dark blue solid is placed in an oven for drying, and the dark blue powder after drying is taken out after 24 hours, which is the polyaniline@titanium dioxide (PANI@TiO2) composite nanoparticles.

[0047] Comparative Example 3

[0048] A preparation method of polyaniline@titanium dioxide / polyarylether nitrile (PANI@TiO2 / PEN) composite fiber membrane without polydopamine modification, specifically as follows:

[0049] Dissolve 2 g of PEN powder in 5 mL of an organic solvent to prepare a polyarylether nitrile solution, heat and stir for 2 hours; then, collect the PEN solution with a syringe and place it on an electrospinning machine for spinning; then, dry it in an oven at 80°C for 24 hours to obtain a PEN nanofiber membrane; finally, load a PANI@TiO2 suspension with a concentration of 20 mg / mL on the PEN nanofiber membrane by vacuum self-assembly method, and dry it in an oven at 80°C to obtain a PANI@TiO2 / PEN composite fiber membrane without polydopamine modification.

[0050] In addition, in order to further illustrate the advantages of the present technology compared with the prior art, the inventors conducted the following tests on the above examples and comparative examples, and the specific operation contents are as follows:

[0051] Test Example 1

[0052] The PANI@TiO2 / PEN composite fiber membranes prepared in Examples 1, 3 and 7 were characterized for their microstructure, and the results are shown in Figure 1 .

[0053] The PEN nanofiber membrane is used as a substrate for subsequent treatment, and after coating with polydopamine, the PANI@TiO2 is stably loaded on the fiber membrane due to the adhesion properties of polydopamine. With the increase of the concentration of the PANI@TiO2 suspension, the PANI@TiO2 nanoparticles loaded on the surface of the fiber membrane gradually show a saturated state.Figure 1 a) The surface can see bare fibers, Example 3( Figure 1 b) The surface is relatively uniform and only a small amount of voids appear, Example 7( Figure 1 c) The surface of PANI / TiO2 is relatively flat and uniform, showing a saturated loading state.

[0054] Test Example 2

[0055] The PANI@TiO2 / PEN composite fiber membrane prepared in Example 3 was subjected to elemental analysis to prove that the surface of the composite fiber membrane is PANI@TiO2 composite nanoparticles, and the measured area is shown in Figure 2 (a).

[0056] In order to further confirm the presence of PANI@TiO2 on the surface of the composite fiber membrane, EDS elemental mapping analysis was performed on the composite fiber membrane, and the signal of Ti element was detected, as shown in Figure 2 (b). Thus, the presence of Ti element is verified, which indicates that the material loaded on the surface of the fiber is indeed PANI@TiO2 nanoparticles.

[0057] Test Example 3

[0058] The fiber membranes prepared in Comparative Example 1, Comparative Example 3, and Example 3 were subjected to contact angle test to characterize the wetting performance of the fiber membranes, as shown in Figure 3 .

[0059] PEN nanofiber membrane( Figure 3 a) The water contact angle is still 139° after 8 seconds, showing hydrophobicity. The PANI@TiO2 / PEN composite fiber membrane( Figure 3 b) The water contact angle is 43° after 8 seconds. In order to further improve the hydrophilicity of the nanofiber membrane, the fiber membrane was subjected to PDA modification, as shown in Figure 3 c) It can be seen that the water contact angle of the PANI@TiO2 / PEN composite fiber membrane modified by PDA can change from 20° to 0° within 0.4 seconds. This is because the hydroxyl and amino groups of PDA are loaded on the surface of the fiber membrane and in the fiber voids, and PANI@TiO2 can be loaded on the surface layer by vacuum self-assembly method, so as to maintain the superhydrophilic state.

[0060] Test Example 4

[0061] The PANI@TiO2 / PEN composite fiber membranes prepared in Examples 1-7 were subjected to water evaporation test to characterize the evaporation rate of the composite fiber membranes, as shown in Figure 4 .

[0062] The performance of solar-driven evaporation was evaluated under the irradiation of sunlight, and the water evaporation rate of the composite fiber membrane was changed by controlling the concentration of PANI@TiO2 suspension. Figure 4 It can be seen that as the concentration of PANI@TiO2 increases from 5 mg / mL to 20 mg / mL, the water evaporation rate increases from 2.68 kg·m -2 h -1 to 3.23 kg·m -2 h -1 With further increase of the concentration of PANI@TiO2, the water evaporation rate decreases until it tends to be stable.

[0063] Test Example 5

[0064] The PANI@TiO2 / PEN composite fiber membrane prepared in Example 3 was subjected to photodegradation test to characterize the photocatalytic performance of the composite fiber membrane, as shown in Figure 5 .

[0065] Methylene blue (MB) solution was used as a typical dye pollutant, and after adsorption saturation, its photocatalytic performance was evaluated by photodegradation experiment. It can be seen from Figure 5 that after 12 h of adsorption in the dark, the concentration of MB decreased by 53.47%, indicating that the composite fiber membrane has good adsorption capacity. With the increase of irradiation time, the characteristic peak of MB in the ultraviolet absorption spectrum gradually decreases, and after 1 h of irradiation, the dye removal rate of the composite fiber membrane is 61.68%, and after 6 h of continuous irradiation, the dye removal rate of the composite fiber membrane can reach 92.17%, ensuring that the composite fiber membrane can continuously degrade the dye during long-term use, avoiding secondary pollution of water resources, and ensuring efficient water treatment efficiency.

[0066] The above description of the disclosed embodiments enables one skilled in the art to make or use the invention. Numerous modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A solar-driven interfacial water evaporation and photocatalytic dye degradation bifunctionalized composite fiber membrane, characterized in that, The composite fiber membrane is a polyaniline / titanium dioxide / polyarylether nitrile composite fiber membrane, which is prepared by electrospinning technology to prepare a polyarylether nitrile nanofiber membrane, in-situ polymerization to prepare polyaniline / titanium dioxide composite nanoparticles, and vacuum self-assembly with polydopamine to load the polyaniline / titanium dioxide composite nanoparticles on the surface of the polyarylether nitrile nanofiber membrane for bifunctional modification, and finally obtain the polyaniline / titanium dioxide / polyarylether nitrile composite fiber membrane. The preparation method of the solar-driven interface water evaporation and photocatalytic dye degradation bifunctional composite fiber membrane specifically comprises the following steps: (1) dissolving polyarylether nitrile powder in an organic solvent to prepare a polyarylether nitrile solution, and then preparing a polyarylether nitrile nanofiber membrane by electrospinning technology; (2) preparing polyaniline / titanium dioxide composite nanoparticles by in-situ polymerization; The specific operation is as follows: first, prepare a 1.2 mol / L hydrochloric acid solution; dissolve 0.1218 mL of aniline (ANI) in 90 mL of the 1.2 mol / L hydrochloric acid solution, and then add 0.512 g of TiO2 to obtain a mixed solution A, and ultrasonically stir the solution for 30 minutes to ensure uniform mixing; Dissolve 0.292 g of ammonium persulfate (APS) in 30 mL of the 1.2 mol / L hydrochloric acid solution to obtain a mixed solution B; then, drop the B solution into the A solution at a speed of 1 drop per second, and stir in an ice bath for 6 hours, and then repeat the filtration for 3-4 times until the filtrate is neutral to remove excess hydrochloric acid; finally, the obtained dark blue solid is dried in an oven, and the dried dark blue powder is taken out after 24 hours; (3) first, modify the surface of the fiber membrane with polydopamine, and then load the polyaniline / titanium dioxide composite nanoparticles on the surface of the fiber membrane by vacuum self-assembly, wherein the concentration of the PANI@TiO2 suspension is 5-100 mg / mL; then, dry, and the polyaniline / titanium dioxide / polyarylether nitrile composite fiber membrane is obtained; The specific process of modifying the surface of the fiber membrane with polydopamine is as follows: dissolve dopamine solid in Tris-HCl buffer (pH=8.5) with a concentration of 0.5-1.5 mg / mL, and the water bath reaction temperature is 20-30°C, and the reaction time is 10-12 hours, and then take out the polyarylether nitrile nanofiber membrane and dry it.

2. The solar driven interfaced water evaporation and photocatalytic dye degradation bifunctionalized composite fiber membrane according to claim 1, characterized in that, In step (1), 2 g of PEN powder is dissolved in 5 mL of an organic solvent to prepare a polyarylether nitrile solution, and the organic solvent is N,N-dimethylformamide (DMF); the electrospinning voltage is 18 kV, the pushing speed is 0.0009 mm / s, and the rotating speed of the drum receiver is 300 rpm; aluminum foil is covered on the drum receiver, and the electrospinning is maintained for 10-12 hours to prepare the polyarylether nitrile nanofiber membrane.

3. The solar-driven interface water evaporation and photocatalytic dye degradation bifunctional composite fiber membrane according to claim 1 is applied to water resource purification and dye-containing industrial wastewater treatment.

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