CN114797985A - Flexible and recyclable C 3 N 4 ZIF-8 composite nanofiber photocatalytic film and preparation method thereof - Google Patents

Flexible and recyclable C 3 N 4 ZIF-8 composite nanofiber photocatalytic film and preparation method thereof Download PDF

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CN114797985A
CN114797985A CN202210306820.8A CN202210306820A CN114797985A CN 114797985 A CN114797985 A CN 114797985A CN 202210306820 A CN202210306820 A CN 202210306820A CN 114797985 A CN114797985 A CN 114797985A
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杨兴华
李智昂
朱家宝
滕平平
田凤军
朱正
张杨
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Harbin Engineering University
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Abstract

The invention provides a flexible and recyclable C 3 N 4 a/ZIF-8 composite nanofiber membrane and a preparation method thereof. C of the invention 3 N 4 the/ZIF-8 composite flexible membrane is made of C 3 N 4 the/ZIF-8 composite polymer fiber is interwoven, and the preparation method comprises the following steps: 1)C 3 N 4 preparing a nano sheet; 2) PAN-C 3 N 4 Preparing a spinning precursor solution; 3) preparation of PAN-C by electrostatic spinning method 3 N 4 A fibrous membrane; 4) PAN-C 3 N 4 And preparing a/ZIF-8 composite fiber membrane. Flexible PAN-C of the invention 3 N 4 the/ZIF-8 composite fiber membrane has the advantages of smooth appearance, good flexibility, high temperature resistance, oxidation resistance, high photocatalytic degradation efficiency on organic pollutants and the like, and has a catalytic effect compared with that of single C due to the generation of heterojunction 3 N 4 And the ZIF-8 catalyst greatly improves the degradation efficiency of organic matters.

Description

Flexible and recyclable C 3 N 4 ZIF-8 composite nanofiber photocatalytic film and preparation method thereof
Technical Field
The invention belongs to the technical field of composite photocatalysts for degrading organic pollutants by electrostatic spinning, and particularly relates to flexible and recyclable C 3 N 4 A ZIF-8 composite nanofiber membrane and a preparation method thereof.
Background
In recent years, in the face of increasingly serious environmental pollution, particularly organic pollutants and heavy metal ions contained in industrial wastewater have particularly strong carcinogenicity and mutagenicity, the degradation of harmful substances in water bodies is more and more emphasized. The semiconductor photocatalysis technology is an environment-friendly green catalysis technology, can directly convert abundant solar energy into chemical energy, and is an effective way for coping with environmental pollution. The method for catalyzing the degradation of pollutants by utilizing solar energy is a feasible way for treating toxic organic matters and solving the environmental pollution. Graphitic carbonitrides (g-C) 3 N 4 ) The high-efficiency non-metal photocatalyst has thermal stability, low cost and visible spectrum response in the field of photocatalysis, and has a wide application range. C 3 N 4 When the photocatalyst is used as a photocatalyst, the photocatalyst is usually put into polluted waste liquid directly in a powder form, but the method has the defects of small specific surface area of the photocatalyst, low photocatalytic efficiency and difficulty in recycling the catalyst, and is easy to cause secondary pollution to the environment.
MOFs (Metal organic framework) is an abbreviation for metal organic framework compound. The crystalline porous material with a periodic network structure is formed by connecting an inorganic metal center (metal ions or metal clusters) and a bridging organic ligand in a self-assembly manner. Most of the metal organic frameworks have high porosity and good chemical stability, and the MOFs material has wider application prospect in the fields of catalysts, energy storage, adsorption and the like due to the fact that the structure of pores can be controlled and the specific surface area is large. ZIF-8, which is one representative of MOFs materials, has many characteristics of MOFs materials, such as strong chemical stability, high electron transfer efficiency, and large specific surface area. The unique structural characteristics of the material are beneficial to charge transfer between metal and ligand, the number of heterojunctions can be improved, the number of active sites can be increased, and active substances can be limited in a limited porous space for reaction.
The electrospinning technique is a simple and effective method for preparing one-dimensional nanofibers, and the fibers prepared by electrospinning have a diameter of the order of nanometers and a fiber length that is excessively long relative to the diameter, so that the fibers prepared by electrospinning can be regarded as one-dimensional and can provide a high specific surface area. The electrospun PAN nanofiber has smooth surface and uniform diameter, is insoluble in water, and the disordered PAN fiber can form a net structure, has flexibility, does not change in shape when meeting water, and provides great convenience for separation, recovery and reuse of the catalyst after photocatalytic degradation.
In view of the above, it is necessary to combine the advantages of the three to research a flexible visible-light catalyst with better photocatalytic performance and easy recycling.
Disclosure of Invention
The invention aims to solve the problems that a photocatalyst is difficult to recover and has low catalytic degradation on organic matters in a visible light range, provides a high-efficiency, easily-recovered and flexible photocatalyst, and particularly relates to flexible and recoverable C 3 N 4 a/ZIF-8 composite nanofiber membrane and a preparation method thereof. C of the invention 3 N 4 the/ZIF-8 composite flexible membrane is made of C 3 N 4 The ZIF-8 composite polymer fiber is formed by interweaving, and the preparation method comprises the following steps：1)C 3 N 4 Preparing a nano sheet; 2) PAN-C 3 N 4 Preparing a spinning precursor solution; 3) preparation of PAN-C by electrostatic spinning method 3 N 4 A fibrous membrane; 4) PAN-C 3 N 4 And preparing a/ZIF-8 composite fiber membrane. Flexible PAN-C of the invention 3 N 4 the/ZIF-8 composite fiber membrane has the advantages of smooth appearance, good flexibility, high temperature resistance, oxidation resistance, high photocatalytic degradation efficiency on organic pollutants and the like. Due to the generation of heterojunctions, the catalytic effect is comparable to that of C alone 3 N 4 And the ZIF-8 catalyst greatly improves the degradation efficiency of organic matters.
The invention provides flexible and recyclable PAN-C for realizing easy recovery, catalytic performance improvement and simple preparation of a photocatalytic material 3 N 4 the/ZIF-8 composite flexible nano-fiber photocatalytic membrane is prepared by mixing PAN-C 3 N 4 The nanofiber membrane is combined with a porous MOFs material ZIF-8, and a heterojunction is constructed, so that the photo-generated electron-hole recombination is reduced, and the photo-catalytic activity of the film is improved; the method has the advantages of simple preparation, low cost, simple operation and the like, and the composite flexible photocatalytic film has excellent catalytic performance, randomly adjustable shape and stronger flexibility of fiber and has higher production value in practical application.
In order to achieve the above object, the present invention is realized by the following technical solutions:
flexible and recyclable C 3 N 4 The preparation method of the/ZIF-8 composite nanofiber photocatalytic film comprises the following steps:
1) by direct calcination 3 N 4 Preparing a nano sheet;
2) through C 3 N 4 The preparation of spinning solution is carried out by a method of directly doping nano-sheets, and PAN-C is prepared by an electrostatic spinning method 3 N 4 A nanofiber photocatalytic film;
3) PAN-C by normal temperature liquid phase growth method 3 N 4 And preparing the/ZIF-8 composite nanofiber photocatalytic film.
Further, step 1) is equipped withThe body is as follows: directly putting melamine powder into a ceramic ark, transferring the melamine powder into a muffle furnace, setting the heating rate at 10 ℃/min, calcining to 550 ℃, keeping the temperature for 2h, and grinding for 30min after the temperature is reduced to room temperature to obtain a final product C 3 N 4 Nanosheets.
Further, the step 2) is specifically as follows: taking 2g of C prepared in step 1) 3 N 4 Dissolving the nano-sheets in 20mL of N, N-dimethylformamide, and ultrasonically treating C for 30min 3 N 4 Stripping into smaller pieces, adding 2.5g of polyacrylonitrile, magnetically stirring the solution at 50 ℃ for 2h, and collecting the uniformly stirred solution with electrostatic spinning equipment.
Further, the electrostatic spinning parameters in the step 2) are as follows: the distance between the spinning nozzle and the fiber receiving device is 12cm-15cm, 12kV voltage is applied to the spinning nozzle, an aluminum plate of the receiving device is connected with an electrode and is grounded, the capacity of an injector is 5mL, the diameter of a spinning needle head is 0.25mm, the spinning solution supply speed is 15 mu L/min, and the air humidity is controlled below 40%.
Further, the step 3) is specifically as follows: first 100mg PAN-C 3 N 4 Soaking the fiber in solution with CH 0.074-0.59 g 3 COO) 2 Zn in 25mL methanol for 5min and noted as solution 1, 0.164g-1.312g C 4 H 6 N 2 Dissolved in 25mL of methanol solution and recorded as solution 2, solution 2 was added dropwise to solution 1 under magnetic stirring and magnetic stirring was maintained for 12 h.
Further, the step 3) is specifically as follows: first 100mg PAN-C 3 N 4 The fibers were soaked in a solution of 0.295g CH 3 COO) 2 Zn in 25mL methanol for 5min and noted solution 1, 0.656g C 4 H 6 N 2 Dissolved in 25mL of methanol solution and recorded as solution 2, solution 2 was added dropwise to solution 1 under magnetic stirring and magnetic stirring was maintained for 12 h.
Further, the liquid in step 3) is methanol solution, the same amount of 25mL of methanol is put into two beakers, 2-methylimidazole and zinc acetate are respectively put in equal proportion, and the fiber obtained by the fiber in step 2) of the preparation method is carried out at normal temperatureZIF-8 Square pellets and PAN-C 3 N 4 The growth of the nano-fiber photocatalytic film is combined.
Flexible and recyclable C 3 N 4 The ZIF-8 composite nano-fiber photocatalysis membrane consists of C 3 N 4 the/ZIF-8 composite polymer fiber is formed by interweaving, and the diameter of the fiber is 200 nm.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a recyclable PAN-C 3 N 4 A preparation method of a/ZIF-8 composite flexible nanofiber photocatalytic membrane capable of preparing PAN-C through electrostatic spinning 3 N 4 After the flexible nanofiber membrane is subjected to the step, ZIF-8 and PAN-C are subjected to one-step normal-temperature liquid phase growth 3 N 4 The nano-fiber membranes are combined to construct a heterojunction, so that the separation efficiency of photon-generated carriers is improved, and the PAN-C is further improved 3 N 4 The ZIF-8 composite flexible photocatalyst has visible light catalytic performance, and the prepared catalyst can be used for pollutant degradation in real life and is an environment-friendly material.
Drawings
FIG. 1 is an SEM photograph of a photocatalytic fiber prepared in example 3;
FIG. 2 is an SEM photograph of a photocatalytic fiber prepared in example 5;
fig. 3 is an XRD pattern of the photocatalytic fiber prepared in example 5.
Detailed description of the preferred embodiments
The principles and features of the present invention are described below, but the present invention is not limited to these embodiments.
Flexible and recyclable C 3 N 4 The preparation method of the/ZIF-8 composite nanofiber photocatalytic film comprises the following steps:
1) by direct calcination 3 N 4 Preparing a nanosheet;
directly dispersing a certain amount of melamine powder into a ceramic square boat, placing the ceramic square boat in a muffle furnace for calcination, setting the temperature rise speed of the muffle furnace to be 10 ℃/min, raising the temperature of the calcination to 550 ℃, preserving the heat for 2 hours, and after the heating is finishedThen naturally cooling to room temperature, because of the product C after firing 3 N 4 Is a large solid, to ensure C 3 N 4 The product is a nano-scale sheet, and is ground in a mortar for 30min to obtain a final product C 3 N 4 Nanosheets.
2) PAN-C by electrospinning 3 N 4 Preparing a nanofiber membrane;
firstly, 2g of C prepared in step 1) are taken 3 N 4 Dissolving the nanosheets in 20mL of N, N-Dimethylformamide (DMF), and subjecting C to ultrasonication for 30min 3 N 4 Stripping to obtain smaller sheet structure, adding 2.5g polyacrylonitrile (PAN molecular weight of 150000), magnetically stirring the solution at 50 deg.C for 2h, and aging the obtained spinning precursor solution overnight.
Transferring the aged precursor solution into a 5mL injector, applying 12kV voltage to the anode of a spinneret connected with a high-voltage electrostatic power supply, controlling the distance between the spinneret and a fiber receiving device to be 12-15 cm, connecting an aluminum plate of the receiving device with an electrode to be grounded, controlling the flow rate of an injection pump to be 15 mu L/min, controlling the air humidity to be below 40%, and continuously collecting spinning fibers for 10 h.
3) PAN-C by normal temperature liquid phase growth method 3 N 4 Preparing a/ZIF-8 composite nanofiber photocatalytic film;
first 100mg PAN-C 3 N 4 Soaking the fiber in solution with 0.295g (CH) 3 COO) 2 Zn in 25mL methanol for 5min and noted solution 1, 0.656g C 4 H 6 N 2 Dissolving in 25mL of methanol solution and recording as solution 2, dropwise adding the solution 2 into the solution 1 under magnetic stirring, and keeping the slow magnetic stirring for 12h to ensure that ZIF-8 particles uniformly grow in PAN-C 3 N 4 The surface of the fiber. After stirring, taking out the fiber, respectively cleaning the fiber twice by using deionized water and absolute ethyl alcohol, and drying the fiber in a vacuum oven at 60 ℃ for 2 hours;
the liquid phase is a methanol solution which is originally grown, the same amount of 25mL of methanol is put into two beakers, and 2-methylimidazole with equal proportion is respectively put into the beakersAzole (C) 4 H 6 N 2 ) And zinc acetate ((CH) 3 COO) 2 Zn), performing ZIF-8 square particles and PAN-C on the fiber obtained in the step 2 of the preparation method at normal temperature 3 N 4 The growth of the nano-fiber photocatalytic film is combined.
The photocatalytic experiments in the examples were tested by the following conditions:
the method comprises the steps of taking 100mg of the flexible photocatalyst prepared by the method, placing the flexible photocatalyst into 50mL of rhodamine B simulated pollution solution with the concentration of 10mg/L before illumination test, placing the solution in a dark place and keeping magnetic stirring for 30min to achieve adsorption-desorption balance, installing a visible light filter with the cutoff wavelength of 420nm at a light outlet of a 300W xenon lamp light source, simulating sunlight catalytic degradation by visible light band light, sampling every 15min in an experiment, and testing the absorbance of the solution by an ultraviolet visible spectrophotometer to obtain the degradation efficiency of total organic carbon in the solution.
Example 1
Preparation of C by direct calcination 3 N 4 Nanosheet:
directly putting a certain amount of melamine powder into a ceramic square boat, putting the ceramic square boat into a muffle furnace for calcination, setting the temperature rise speed of the muffle furnace to be 10 ℃/min, heating the calcination to 550 ℃, keeping the temperature for 2h, naturally cooling the calcined product to room temperature after the heating is finished, and obtaining a product C after the calcination 3 N 4 Is a large solid, to ensure C 3 N 4 The product is a nano-scale sheet, and is ground in a mortar for 30min to obtain a final product C 3 N 4 Nanosheets.
Example 2
Preparation of PAN-C by electrostatic spinning method 3 N 4 And (3) nano fiber membrane:
the C prepared in example 1 3 N 4 Dissolving 2g of nanosheet in 20mL of N, N-dimethylformamide solution, and ultrasonically treating C for 30min 3 N 4 Peeling to obtain smaller sheet structure, adding 2.5g polyacrylonitrile (molecular weight of 150000), magnetically stirring at 50 deg.C for 2 hrAfter the spinning precursor solution is evenly mixed, the prepared spinning precursor solution is kept stand and aged for one night.
Transferring the prepared spinning precursor solution to a micro-flow injection pump, connecting a high-voltage electrostatic power supply anode with a spinning nozzle through a lead, grounding an aluminum foil plate of a receiving device, wherein the high-voltage power supply is set to be 12kV, the propelling speed of the injection pump is 15 mu L/min, the distance between the spinning nozzle and the receiving device is 12cm-15cm, controlling the air humidity below 40%, and continuously collecting spinning fibers for 10 hours. The collected fiber was recorded as PAN-C 3 N 4 The efficiency of photocatalytic degradation of rhodamine B by the nanofiber membrane is 32.2%.
Example 3
PAN-C 3 N 4 The preparation method of the/ZIF-8 composite flexible nanofiber photocatalytic film 1 comprises the following steps:
PAN-C prepared in example 2 3 N 4 Soaking fiber 100mg in solution with 0.074g (CH) 3 COO) 2 Zn in 25mL methanol for 5min, 0.164g C 4 H 6 N 2 Dissolving in 25mL of methanol solution, and stirring C under magnetic force 4 H 6 N 2 Is added dropwise to (CH) 3 COO) 2 Zn in methanol, and kept under slow magnetic stirring for 12 h. After stirring, taking out the fiber, respectively cleaning with deionized water and anhydrous ethanol twice, drying in a vacuum oven at 60 deg.C for 2h, and marking as PAN-C 3 N 4 The efficiency of photocatalytic degradation of rhodamine B by the aid of the/ZIF-8 composite catalyst 1 is 54.5%.
Example 4
PAN-C 3 N 4 The preparation method of the/ZIF-8 composite flexible nanofiber photocatalytic film 2 comprises the following steps:
PAN-C prepared in example 2 3 N 4 Soaking 100mg of fiber in 0.148g (CH) 3 COO) 2 Zn in 25mL methanol solution for 5min, 0.328g C 4 H 6 N 2 Dissolving in 25mL of methanol solution, and stirring C under magnetic force 4 H 6 N 2 Is added dropwise to (CH) 3 COO) 2 Methanol solution of ZnIn the solution, and slowly stirring for 12h by magnetic force. After stirring, taking out the fiber, washing with deionized water and absolute ethyl alcohol twice respectively, drying in a vacuum oven at 60 ℃ for 2h, and marking as PAN-C 3 N 4 The efficiency of photocatalytic degradation of rhodamine B is 75.8 percent by using the/ZIF-8 composite catalyst 2.
Example 5
PAN-C 3 N 4 The preparation method of the/ZIF-8 composite flexible nanofiber photocatalytic film 3 comprises the following steps:
PAN-C prepared in example 2 3 N 4 Soaking 100mg of fiber in solution of 0.295g CH 3 COO) 2 Zn in 25mL methanol for 5min, 0.656g C 4 H 6 N 2 Dissolved in 25mL of methanol solution and stirred magnetically to dissolve C 4 H 6 N 2 Is added dropwise to CH 3 COO) 2 Zn in methanol, and kept under slow magnetic stirring for 12 h. After stirring, taking out the fiber, respectively cleaning with deionized water and anhydrous ethanol twice, drying in a vacuum oven at 60 deg.C for 2h, and marking as PAN-C 3 N 4 The efficiency of photocatalytic degradation of rhodamine B by using the ZIF-8 composite catalyst 3 is 85.5 percent.
Example 6
PAN-C 3 N 4 The preparation method of the/ZIF-8 composite flexible nanofiber photocatalytic film 4 comprises the following steps:
PAN-C prepared in example 2 3 N 4 Soaking 100mg of fiber in solution of 0.59g CH 3 COO) 2 Zn in 25mL methanol for 5min, 1.312g C 4 H 6 N 2 Dissolving in 25mL of methanol solution, and stirring C under magnetic force 4 H 6 N 2 Is added dropwise to CH 3 COO) 2 Zn in methanol, and kept under slow magnetic stirring for 12 h. After stirring, taking out the fiber, respectively cleaning with deionized water and anhydrous ethanol twice, drying in a vacuum oven at 60 deg.C for 2h, and marking as PAN-C 3 N 4 The efficiency of degrading rhodamine B by photocatalysis is 77.7 percent by using the/ZIF-8 composite catalyst 4.
Examples of effects
FIG. 1 shows PAN-C prepared in example 3 3 N 4 The scanning electron microscope picture of the/ZIF-8 composite photocatalyst fiber can obtain that the diameter of a polymer fiber framework is about 200nm, a small amount of ZIF-8 nano blocks are loaded on the fiber, and the ZIF-8 nano blocks and C on the polymer fiber framework 3 N 4 The combination of the nano-sheets promotes the separation of photogenerated carriers in the photocatalysis process, and PAN-C 3 N 4 the/ZIF-8 composite photocatalyst fiber has a nanometer diameter, and the fiber length is very long, so the fiber can be regarded as one-dimensional, and therefore, the fiber has a very high specific surface area, more reaction sites are provided for photocatalytic reaction, and the photocatalytic degradation efficiency is improved.
FIG. 2 shows PAN-C prepared in example 5 3 N 4 The scanning electron microscope picture of the/ZIF-8 composite photocatalyst fiber has a diameter similar to that of the fiber shown in figure 1, a large number of ZIF-8 nano blocks are loaded on the fiber, and more ZIF-8 nano blocks and C on a high molecular fiber framework 3 N 4 The nano sheets are combined, so that the separation of photogenerated carriers in the photocatalysis process is promoted, and the photocatalysis degradation efficiency is greatly improved.
FIG. 3 shows PAN-C prepared in example 5 3 N 4 X-ray diffraction spectrum pictures of a/ZIF-8 composite photocatalyst fiber membrane can show that 2Theta has characteristic diffraction peaks of ZIF-8 at 7.39, 10.38, 12.76, 14.67, 16.44, 18.13, 22.12, 24.49, 26.65, 29.64, 30.64, 31.48, 32.40 and 34.94 degrees and has characteristic diffraction peaks of C at 27.4 degrees 3 N 4 No peaks of other substances were observed in the figure, which indicates that PAN-C prepared according to the present invention 3 N 4 Only C in/ZIF-8 composite photocatalyst fibrous membrane 3 N 4 And ZIF-8.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (9)

1. Flexible and recyclable C 3 N 4 The preparation method of the/ZIF-8 composite nanofiber photocatalytic membrane is characterized by comprising the following steps of:
1) by direct calcination 3 N 4 Preparing a nano sheet;
2) through C 3 N 4 The preparation of spinning solution is carried out by a method of directly doping nano-sheets, and PAN-C is prepared by an electrostatic spinning method 3 N 4 A nanofiber photocatalytic film;
3) PAN-C by normal temperature liquid phase growth method 3 N 4 And preparing the/ZIF-8 composite nanofiber photocatalytic film.
2. Flexible recyclable C according to claim 1 3 N 4 The preparation method of the/ZIF-8 composite nanofiber photocatalytic membrane is characterized by comprising the following steps of: the step 1) is specifically as follows: directly putting melamine powder into a ceramic ark, transferring the melamine powder into a muffle furnace, setting the heating rate at 10 ℃/min, calcining to 550 ℃, keeping the temperature for 2h, and grinding for 30min after the temperature is reduced to room temperature to obtain a final product C 3 N 4 Nanosheets.
3. Flexible recyclable PAN-C according to claim 1 3 N 4 The preparation method of the composite nanofiber photocatalytic film is characterized by comprising the following steps of: the step 2) is specifically as follows:
taking 2g of C prepared in step 1) 3 N 4 Dissolving the nano-sheets in 20mL of N, N-dimethylformamide, and ultrasonically treating C for 30min 3 N 4 Stripping into smaller pieces, adding 2.5g of polyacrylonitrile, magnetically stirring the solution at 50 ℃ for 2h, and collecting the uniformly stirred solution with electrostatic spinning equipment.
4. Flexible recyclable C according to claim 1 3 N 4 The preparation method of the/ZIF-8 composite nanofiber photocatalytic film is characterized by comprising the following steps of: step 2) the electrostatic spinning parametersComprises the following steps: the distance between the spinning nozzle and the fiber receiving device is 12cm-15cm, 12kV voltage is applied to the spinning nozzle, an aluminum plate of the receiving device is connected with an electrode and is grounded, the capacity of an injector is 5mL, the diameter of a spinning needle head is 0.25mm, the spinning solution supply speed is 15 mu L/min, and the air humidity is controlled below 40%.
5. Flexible recyclable C according to claim 1 3 N 4 The preparation method of the/ZIF-8 composite nanofiber photocatalytic membrane is characterized by comprising the following steps of: the step 3) is specifically as follows: first 100mg PAN-C 3 N 4 Soaking the fiber in solution with CH 0.074-0.59 g 3 COO) 2 Zn in 25mL methanol for 5min and noted as solution 1, 0.164g-1.312g C 4 H 6 N 2 Dissolved in 25mL of methanol solution and recorded as solution 2, solution 2 was added dropwise to solution 1 under magnetic stirring and magnetic stirring was maintained for 12 h.
6. Flexible recyclable C according to claim 1 3 N 4 The preparation method of the/ZIF-8 composite nanofiber photocatalytic film is characterized by comprising the following steps of: the step 3) is specifically as follows: first 100mg PAN-C 3 N 4 The fibers were soaked in a solution of 0.295g CH 3 COO) 2 Zn in 25mL methanol for 5min and noted solution 1, 0.656g C 4 H 6 N 2 Dissolved in 25mL of methanol solution and recorded as solution 2, solution 2 was added dropwise to solution 1 under magnetic stirring and magnetic stirring was maintained for 12 h.
7. Flexible recyclable C according to claim 1 3 N 4 The preparation method of the/ZIF-8 composite nanofiber photocatalytic film is characterized by comprising the following steps of: step 3) taking a methanol solution as a liquid for liquid phase growth, putting 25mL of methanol in equal amount into two beakers, respectively putting 2-methylimidazole and zinc acetate in equal proportion, and carrying out ZIF-8 square particles and PAN-C on the fiber obtained in the step 2) of the preparation method at normal temperature 3 N 4 The growth of the nano-fiber photocatalytic film is combined.
8. AA flexible recyclable C prepared according to any one of claims 1 to 7 3 N 4 the/ZIF-8 composite nano-fiber photocatalytic film is characterized by consisting of C 3 N 4 the/ZIF-8 composite polymer fiber is interwoven.
9. A flexible recyclable C according to claim 7 3 N 4 the/ZIF-8 composite nanofiber photocatalytic membrane is characterized in that: the fiber diameter is 200 nm.
CN202210306820.8A 2022-03-25 2022-03-25 Flexible and recyclable C 3 N 4 ZIF-8 composite nanofiber photocatalytic film and preparation method thereof Pending CN114797985A (en)

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