CN114950407A - Preparation method of multifunctional flexible photocatalytic film - Google Patents
Preparation method of multifunctional flexible photocatalytic film Download PDFInfo
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- CN114950407A CN114950407A CN202210545615.7A CN202210545615A CN114950407A CN 114950407 A CN114950407 A CN 114950407A CN 202210545615 A CN202210545615 A CN 202210545615A CN 114950407 A CN114950407 A CN 114950407A
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- glass cloth
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- 239000002243 precursor Substances 0.000 claims abstract description 20
- 239000002131 composite material Substances 0.000 claims abstract description 17
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- 238000001291 vacuum drying Methods 0.000 claims abstract description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 22
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- 230000003197 catalytic effect Effects 0.000 abstract description 8
- 238000001035 drying Methods 0.000 abstract description 3
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 1
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- LDXJRKWFNNFDSA-UHFFFAOYSA-N 2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical compound C1CN(CC2=NNN=C21)CC(=O)N3CCN(CC3)C4=CN=C(N=C4)NCC5=CC(=CC=C5)OC(F)(F)F LDXJRKWFNNFDSA-UHFFFAOYSA-N 0.000 description 1
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 1
- IKHGUXGNUITLKF-XPULMUKRSA-N acetaldehyde Chemical compound [14CH]([14CH3])=O IKHGUXGNUITLKF-XPULMUKRSA-N 0.000 description 1
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/30—Tungsten
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8671—Removing components of defined structure not provided for in B01D53/8603 - B01D53/8668
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8678—Removing components of undefined structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/40—Catalysts, in general, characterised by their form or physical properties characterised by dimensions, e.g. grain size
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- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/58—Fabrics or filaments
- B01J35/59—Membranes
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/34—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation
- B01J37/341—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation
- B01J37/342—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation of electric, magnetic or electromagnetic fields, e.g. for magnetic separation
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
- D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
- D04H1/728—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by electro-spinning
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- B01D2257/708—Volatile organic compounds V.O.C.'s
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Abstract
The invention discloses a preparation method of a multifunctional flexible photocatalytic film. The preparation method comprises the following steps: 1. preparing electrostatic spinning precursor solution; 2. preparing a polymer nanofiber membrane/glass cloth through electrostatic spinning, and drying and calcining the polymer nanofiber membrane/glass cloth; 3. preparing electrostatic spinning precursor solution containing a photocatalyst; 4. preparation of photocatalyst-polymer nanofiber membrane-carbon nanofiber based on electrostatic spinningThe glass cloth composite material is sequentially subjected to vacuum drying, tubular furnace inert atmosphere calcination and muffle furnace air atmosphere calcination for a proper time. The multifunctional flexible photocatalytic film material obtained by the invention can greatly improve the separation and transmission efficiency of photoproduction electron holes, and the photocatalyst has abundant oxygen vacancies under the support of carbon fibers to provide a large number of catalytic active sites, so that the photocatalyst has remarkable photocatalytic activity; the obtained material can not only reduce CO 2 The indoor VOCs can be degraded, the air can be purified, and the application prospect is good.
Description
Technical Field
The invention relates to a preparation method of a multifunctional flexible photocatalytic film, belonging to the technical field of photocatalytic materials.
Background
The photocatalytic oxidation method for eliminating volatile organic pollutants (VOCs) in the air is a new pollution treatment technology which is increasingly emphasized in recent years. The photocatalysis method for processing VOCs uses photocatalyst to generate electrons and holes under the irradiation of light, and the photoproduced electrons can react with O in the environment 2 Reaction to form O 2－ (superoxide ion radical), the photogenerated holes can react with water molecules in the air to generate hydroxyl radical (. OH). Superoxide ion free radical, hydroxyl free radical and photoproduction cavity all have strong oxidizing power and react with VOCs in the air to decompose the VOCs into CO 2 And H 2 O and the like; the process does not need other chemical auxiliary agents, the reaction conditions are mild, and the final product generally only contains CO 2 And H 2 O, does not produce secondary pollution, and is one of the most potential applied novel technologies aiming at indoor air pollution at present. However, the current high-activity photocatalytic material mainly has a nano powder structure, which limits the practical application thereof, and the development of a novel photocatalytic nano material fixing technology is urgently needed.
In recent years, the nanofiber membrane material prepared by the electrospinning method not only maintains the small crystal grain size of the nanomaterial, but also increases the macroscopic size of the material through the fiber membrane-like structure, so that the nanofiber membrane material is easier to integrate in various environment treatment devices in practical application. However, unlike organic nanofiber membranes, inorganic nanofiber membrane materials prepared by conventional electrospinning techniques have poor toughness, which is caused by the rigid crystal structure of the inorganic material itself. In order to increase the toughness, the flexibility resistance and the like of the inorganic nano material, a large amount of organic auxiliary agents are generally added in the spinning process, and the organic matters are carbonized in the subsequent high-temperature treatment process to prepare the carbon fiber composite flexible nano fiber membrane material. If the process is adopted to prepare the fiber membrane material for photocatalysis, the catalytic activity of the photocatalytic material can be greatly reduced, because the carbonization of organic matters into carbon fibers requires a high temperature of more than 700 ℃, the added nano photocatalytic material can be melted and recrystallized at the high temperature to generate micron-sized crystal grains, and the high activity of the nano material is lost. On the other hand, the surface of the photocatalytic material prepared under the condition is covered with a layer of thicker carbon film, which prevents the direct contact of reactant molecules and the surface of the photocatalytic material, so that the photocatalytic activity is greatly reduced compared with the added original nano catalytic material. In addition, the penetration depth of photons higher than the band gap energy of a semiconductor on the surface of a photocatalytic material is only dozens of nanometers generally, and the photocatalytic film material with the micron thickness obtained by the electrospinning technology cannot effectively exert the catalytic performance on the mass unit, so that the cost problem in practical application is increased.
Based on the technical problems, the invention provides a method for preparing a high-activity ultrathin photocatalytic film material loaded on a flexible substrate by combining an electrostatic spinning technology and a nano material composite technology. In a plurality of high-strength flexible substrates, the glass cloth is high-temperature resistant, wide in application and low in cost, so that the glass cloth is selected as a flexible substrate material to prepare a high-strength and high-activity photocatalytic film material loaded on the glass cloth. Although many studies have been reported on the loading of photocatalytic materials on the surface of glass fiber cloth, there are few practical applications. The reason for this is mainly limited by the material loading technique. For example, the conventional in-situ growth method is adopted to load the photocatalytic material on the surface of the glass cloth, and the glass cloth needs to be subjected to acid washing, alkali washing and subsequent in-situ chemical growth processes, so that the treatment cost is high, and the stability of the growth process of the load material is difficult to ensure. In addition, the high molecular adhesive is gradually degraded by the photocatalytic material in the using process, and finally the photocatalytic coating completely falls off. The electrostatic spinning technology provides possibility for preparing the glass cloth loaded high-activity ultrathin membrane material by adjusting the concentration of a spinning precursor, the spinning time, the spinning temperature and humidity, the subsequent heat treatment conditions and the like. The main problems faced by the current technology are: after the nano catalytic material is sprayed on the surface of the glass cloth through an electrospinning technology, the catalytic material is easy to fall off from the surface layer of the glass cloth due to the huge difference of the thermal expansion coefficients of the nano catalytic material and the glass cloth in the calcining treatment process, so that the composite material is difficult to prepare successfully. In view of the above, the invention provides a preparation method for loading a high-strength, high-stability and high-activity photocatalytic film material on glass cloth. The preparation of the flexible film on the carbon fiber coated glass cloth is realized, and the preparation method has high scientific value and practical significance for indoor air purification.
Disclosure of Invention
The purpose of the invention is: the preparation method of the photocatalytic film material with high strength, high stability and high activity loaded on the glass cloth is provided, the preparation of the flexible film on the carbon fiber coated glass cloth is realized, and the preparation method has high scientific value and practical significance for indoor air purification.
In order to achieve the purpose, the invention provides a preparation method of a multifunctional flexible photocatalytic film, which comprises the following steps:
step 1: preparing a polymer precursor solution for electrostatic spinning;
step 2: putting the polymer precursor solution obtained in the step (1) into an injector, setting spinning conditions by taking glass cloth as a carrier, and performing electrostatic spinning to obtain a polymer nanofiber membrane/glass cloth;
and step 3: vacuum drying the polymer nanofiber membrane/glass cloth at a certain temperature, and calcining the polymer nanofiber membrane/glass cloth in a tubular furnace for a certain time to obtain carbon nanofiber/glass cloth;
and 4, step 4: mixing the polymer precursor solution obtained in the step 1 with a photocatalyst according to a certain proportion, stirring for a certain time, performing ultrasonic dispersion uniformly to obtain a precursor solution containing the photocatalyst, filling the precursor solution into an injector with a proper volume, setting spinning conditions by taking the carbon nanofiber/glass cloth obtained in the step 3 as a carrier, and performing electrostatic spinning to obtain the photocatalyst-polymer nanofiber membrane-carbon nanofiber/glass cloth composite material;
and 5: the light obtained in the step 4 is catalyzedThe agent-polymer nanofiber-carbon nanofiber/glass cloth composite material is dried in vacuum at a certain temperature and calcined for a certain time in inert atmosphere of a tubular furnace to obtain the photocatalyst-carbon nanofiber 1 -carbon nanofibers 2 Calcining the glass cloth composite material in a muffle furnace in air atmosphere, and removing the carbon nanofibers on the outermost surface of the glass cloth composite material by controlling the calcining temperature and the calcining time to obtain the photocatalyst-carbon nanofibers 2 The glass cloth flexible photocatalytic film is a multifunctional flexible photocatalytic film.
Preferably, the polymer used for preparing the polymer precursor solution in the step 1 is at least one of PVP, PAN and PVA, and the solvent used is an alcohol solvent or a carboxylic acid solvent; the mass fraction of the polymer precursor solution is 1-15%.
Preferably, the process conditions of the electrostatic spinning in the step 2 and the step 4 are as follows: the feeding speed is 0.1-20 mL/h, the electrospinning voltage is 15-20 kV, the distance between a nozzle and a collector electrode is 15-20 cm, the rotating speed of a roller is 60r/min, the relative humidity is 30% +/-5%, and the ambient temperature is 23 +/-2 ℃.
Preferably, the calcining temperature of the tubular furnace in the step 3 is 300-800 ℃ and the time is 0.5-12 h.
Preferably, the temperature of vacuum drying in the step 3 and the step 5 is 40-80 ℃, and the time is 0.5-12 h.
Preferably, the ratio of the photocatalyst to the polymer in the step 4 is 0.01-1: 1.
preferably, the calcining temperature of the tubular furnace in the step 5 is 300-800 ℃ and the time is 0.5-12 h.
Preferably, in the step 5, the calcining temperature of the muffle furnace is controlled to be 300-800 ℃, and the calcining time is controlled to be not more than 2 h.
Compared with the prior art, the invention has the beneficial effects that:
(1) the multifunctional flexible film photocatalytic material prepared by the invention has the advantages that the carbon nanofibers firmly loaded on the glass cloth provide a large number of growth attachment points and active sites for the photocatalyst, so that the firm loading of the catalytic material on the surface of the glass cloth is ensured, and the composite photocatalytic material has the advantages ofThe flexible film photocatalytic material has extremely high photocatalytic activity and use stability, and can be used for CO 2 The functions of reducing and degrading indoor VOCs and purifying other pollutants in the air and the like are achieved, and the method has wide application prospect;
(2) the preparation method provided by the invention does not need special equipment and harsh conditions, is simple in process, strong in controllability, easy to realize large-scale production and practical.
Drawings
Fig. 1 is a photograph of electrospun PVP nanofiber membrane/glass cloth obtained in example 1;
FIG. 2 is a photograph of the carbon nanofiber-coated glass cloth obtained in example 1;
FIG. 3 shows Bi obtained in example 2 2 WO 6 -a photograph of a carbon nanofiber-glass cloth composite;
FIG. 4 is a performance curve of photocatalytic reduction of CO2 by the bismuth tungstate flexible film obtained in example 2;
FIG. 5 is a degradation curve of photocatalytic degradation of acetaldehyde by the bismuth tungstate flexible film obtained in example 2, in which C/CO represents post-reaction concentration/initial concentration;
FIG. 6 shows Bi obtained in example 3 2 WO 6 Photograph of glass cloth composite.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Example 1
Preparing carbon fiber/glass cloth:
(1) weighing 1g of polyvinylpyrrolidone PVP, dissolving the polyvinylpyrrolidone in 9g of ethanol, and magnetically stirring at the room temperature of 20 ℃ for 12 hours to form a uniform and transparent polymer precursor solution;
(2) burning glass cloth with a proper size in a muffle furnace for 2 hours at 450 ℃ in an air state, putting the glass cloth into 1mol/L NaOH solution for soaking for 12 hours, leaching with deionized water and ethanol, and drying for later use;
(3) and (3) filling the 5mL of precursor solution into a 10mL injector, and placing the injector in an electrostatic spinning machine. The positive voltage of spinning is 15kv, the spinning is applied to the tip, the distance between the tip and the receiving plate is 15cm, the jet speed is 1.5mL/h, the temperature is 23 ℃, and the humidity is 33%; the PVP nanofiber membrane/glass cloth was prepared using the treated glass cloth as a carrier, as shown in fig. 1.
Putting the spun PVP nanofiber membrane/glass cloth into a constant-temperature oven at 60 ℃ for drying and stabilizing under a vacuum condition, and naturally cooling after 4 hours; n is a radical of 2 Calcining for 2h at the temperature of 500 ℃ in the atmosphere to obtain the carbon fiber/glass cloth, as shown in figure 2.
The detection analysis shows that: example 1 the carbon fiber/glass cloth, PVP nanofiber membrane in N 2 And calcining in the atmosphere to form carbon nanofibers, and tightly combining the carbon nanofibers with the glass cloth, wherein the carbon fibers are firmly loaded in the pores of the glass cloth.
Example 2
Bi 2 WO 6 -preparation of carbon nanofiber-glass cloth composite:
(1) weighing 1g of polyvinylpyrrolidone PVP, dissolving the polyvinylpyrrolidone in 9g of ethanol, and magnetically stirring at the room temperature of 20 ℃ for 12 hours to form a uniform and transparent polymer precursor solution;
(2) 0.26g of Bi 2 WO 6 Dispersing the nano powder into 1mL of ethanol, adding 10mL of 10 wt% PVP solution, stirring at 20 ℃ for 12h, and carrying out electrostatic spinning to obtain Bi by using the carbon fiber/glass cloth prepared in example 1 as a carrier 2 WO 6 -PVP-carbon fibre/glass cloth, vacuum dried before tube furnace N 2 Calcining for 2 hours at the temperature of 500 ℃ in atmosphere to obtain Bi 2 WO 6 -carbon fibres 1 -carbon fibres 2 A glass cloth; then calcining the carbon fiber in a muffle furnace at the temperature of 400 ℃, controlling the calcining time not to exceed 3h, and burning off the carbon fiber on the outermost surface to obtain Bi 2 WO 6 -carbon fibres 2 A glass cloth flexible photocatalytic film as shown in figure 3.
The detection analysis shows that: example 2 obtaining Bi 2 WO 6 -carbon fibres 2 The photocatalyst is firmly loaded on the carbon fiber of the glass cloth. Subjecting the obtained material to CO 2 Reduction Properties (products are CO and CH) 4 ) And acetaldehyde degradation performance test shows that the material not only has better CO 2 The reduction performance, as shown in fig. 4, can also effectively degrade indoor VOCs (such as acetaldehyde, etc.), as shown in fig. 5, has good air purification performance.
Example 3
This embodiment differs from embodiment 2 only in that: the carbon fiber/glass cloth carrier obtained in example 1 was directly replaced with glass cloth, and Bi was added 2 WO 6 The nano-powder is sprayed on a glass cloth carrier through electrospinning.
The rest of the contents are exactly the same as those described in example 1.
The detection analysis shows that: EXAMPLE 3 Bi obtained in this way 2 WO 6 The nano-fiber film/glass cloth composite material is Bi after calcination 2 WO 6 The fiber membrane is separated from the glass cloth as shown in fig. 6.
Example 4
The present embodiment is different from embodiment 2 in that: bi to be obtained 2 WO 6 -carbon fibres 1 -carbon fibres 2 Calcining glass cloth in the air atmosphere of a muffle furnace, and obtaining Bi by controlling the time of carbon fibers on the surface of the glass cloth 2 WO 6 A glass cloth photocatalytic film.
The detection analysis shows that: bi obtained in example 4 2 WO 6 Compared with the glass cloth in the embodiment 2, the carbon fiber on the glass cloth is partially or completely burnt, and the film formed by the photocatalyst and the glass cloth partially show a semi-separation semi-load state or a complete separation state.
Claims (8)
1. A preparation method of a multifunctional flexible photocatalytic film is characterized by comprising the following steps:
step 1: preparing a polymer precursor solution for electrostatic spinning;
step 2: putting the polymer precursor solution obtained in the step (1) into an injector, setting spinning conditions by taking glass cloth as a carrier, and performing electrostatic spinning to obtain a polymer nanofiber membrane/glass cloth;
and step 3: vacuum drying the polymer nanofiber membrane/glass cloth at a certain temperature, and calcining the polymer nanofiber membrane/glass cloth in a tubular furnace for a certain time to obtain carbon nanofiber/glass cloth;
and 4, step 4: mixing the polymer precursor solution obtained in the step 1 with a photocatalyst according to a certain proportion, stirring for a certain time, performing ultrasonic dispersion uniformly to obtain a precursor solution containing the photocatalyst, filling the precursor solution into an injector with a proper volume, taking the carbon nanofiber/glass cloth obtained in the step 3 as a carrier, setting spinning conditions, and performing electrostatic spinning to obtain the photocatalyst-polymer nanofiber membrane-carbon nanofiber/glass cloth composite material;
and 5: the photocatalyst-polymer nanofiber-carbon nanofiber/glass cloth composite material obtained in the step 4 is dried in vacuum at a certain temperature and is calcined for a certain time in an inert atmosphere of a tubular furnace to obtain the photocatalyst-carbon nanofiber 1 -carbon nanofibers 2 Calcining the glass cloth composite material in a muffle furnace in air atmosphere, and removing the carbon nanofibers on the outermost surface of the glass cloth composite material by controlling the calcining temperature and the calcining time to obtain the photocatalyst-carbon nanofibers 2 The glass cloth flexible photocatalytic film is a multifunctional flexible photocatalytic film.
2. The method for preparing a multifunctional flexible photocatalytic film according to claim 1, wherein the polymer used for preparing the polymer precursor solution in step 1 is at least one of PVP, PAN and PVA, and the solvent used is an alcohol solvent or a carboxylic acid solvent; the mass fraction of the polymer precursor solution is 1-15%.
3. The method for preparing the multifunctional flexible photocatalytic film according to claim 1, wherein the electrostatic spinning in the step 2 and the step 4 is carried out under the following process conditions: the feeding speed is 0.1-20 mL/h, the electrospinning voltage is 15-20 kV, the distance between a nozzle and a collector electrode is 15-20 cm, the rotating speed of a roller is 60r/min, the relative humidity is 30% +/-5%, and the ambient temperature is 23 +/-2 ℃.
4. The preparation method of the multifunctional flexible photocatalytic film according to claim 1, wherein the temperature of the tubular furnace calcination in the step 3 is 300-800 ℃ and the time is 0.5-12 h.
5. The preparation method of the multifunctional flexible photocatalytic film as claimed in claim 1, wherein the temperature of vacuum drying in step 3 and step 5 is 40-80 ℃ and the time is 0.5-12 h.
6. The method for preparing the multifunctional flexible photocatalytic film according to claim 1, wherein the ratio of the photocatalyst to the polymer in the step 4 is 0.01-1: 1.
7. the method for preparing the multifunctional flexible photocatalytic film as set forth in claim 1, wherein the calcination temperature in the tubular furnace in the step 5 is 300-800 ℃ and the calcination time is 0.5-12 hours.
8. The preparation method of the multifunctional flexible photocatalytic film according to claim 1, wherein in the step 5, the calcination temperature of a muffle furnace is controlled to be 300-800 ℃, and the calcination time is controlled to be not more than 2 h.
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