A method for preparing a nanofiber membrane for treating wastewater from photovoltaic aluminum profiles

Abstract

This invention relates to a method for preparing a nanofiber membrane for treating wastewater from photovoltaic aluminum profiles, comprising the following steps: S1, preparing a dispersion of polymeric materials; S2, adding a modifier to obtain a spinning solution; S3, adding the spinning solution to an electrospinning apparatus, controlling the closest distance between the nozzle array's ejection end and the rotating cylindrical collector to be 10-12 cm, the rotation speed of the rotating cylindrical collector to be 300-500 rpm, the flow rate ejected from each channel to be 0.5-1.5 mL / h, the spinning voltage to be 15-20 KV, collecting the spun fibers, and then drying them to obtain a nanofiber membrane. The above method can improve the production efficiency of nanofiber membranes to meet the needs of wastewater treatment in large-capacity applications. Simultaneously, the nanofiber membrane exhibits a thickness uniformity greater than or equal to 85% and an arrangement consistency greater than or equal to 85%, demonstrating excellent wastewater treatment capabilities.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a method for preparing a nanofiber membrane for treating wastewater from photovoltaic aluminum profiles. Background Technology

[0002] Aluminum profiles are widely used in the photovoltaic industry. To improve their corrosion resistance, hardness, wear resistance, and aesthetics, aluminum profiles are typically anodized. This process involves using an electrochemical method to form an oxide film on the surface of aluminum and its alloys. The solutions used in the anodizing process become ineffective after repeated use, resulting in a significant amount of waste liquid with a high heavy metal content, requiring further treatment.

[0003] Electrospinning is a technique that uses a high-voltage electric field to stretch polymer solutions or melts into nanofibers. Compared to traditional methods, electrospinning can produce continuous fibers with diameters ranging from tens to hundreds of nanometers. However, the production efficiency of smaller-diameter nanofiber membranes is low, while the demand for nanofiber membranes in wastewater treatment is high, and the existing production capacity of nanofiber membranes is insufficient to meet market demand.

[0004] To increase the yield of nanoscale electrospun fiber membranes, multi-spinneret technology can be used to simultaneously produce multiple fibers, thereby significantly increasing output. An air supply system can also be added to the spinneret to utilize the combined effects of airflow stretching and electrostatic stretching, improving the controllability and yield of nanofiber production. For example, patent application CN115627545A discloses an electrospinning device and its electrospinning nozzle control method. The method controls the spinning nozzle by turning on the supply pump 32, drawing the spinning solution from the spinning solution tank 33 and introducing it into the coil, then from the coil into the spinneret 312. The spinning solution is ejected from the spinneret hole at the bottom of the spinneret 312. Simultaneously, the supply pump 32 is turned on, filling the sleeve 311 surrounding the spinneret 312 with air, which is then ejected from the air outlet 313 at the bottom of the sleeve 311, blowing the fibers downwards to prevent multiple fibers from tangling. At the same time, the circuit of the high-voltage power supply electrode is energized, making the spinning solution entering the spinneret 312 statically charged. Simultaneously, the servo motor of the linear motor 23 operates, controlling the electronic actuator 24 to move left and right on the linear motor 23, thereby driving the nozzle 31 to move left and right above the collector 41. The collector 41 collects the nanofibers ejected from the nozzle 31, forming nanofibers. In the above scheme, because the nozzle 31 moves left and right continuously during the spraying of solution, the thickness of the membrane fibers at both ends of the spun membrane collected by the collector 41 is higher than that of the membrane fibers in the center of the collector. The thickness of the membrane is uneven, resulting in unstable performance of the nanofiber membrane. Summary of the Invention

[0005] The purpose of this invention is to overcome the problem of poor uniformity of nanofibers in the process of improving the production efficiency of existing nanofiber membranes, and to provide a method for preparing nanofiber membranes for treating wastewater from photovoltaic aluminum profiles. By controlling the spray velocity of the nozzle array with a peristaltic pump, and by controlling the rotation speed, distance and voltage of the rotating cylindrical collector, the thickness uniformity and arrangement consistency of the nanofiber membrane can be improved.

[0006] The specific plan is as follows:

[0007] A method for preparing a nanofiber membrane for treating wastewater from photovoltaic aluminum profiles includes the following steps:

[0008] S1. Disperse the polymer material in a solvent to obtain a dispersion;

[0009] S2. Add molybdenum carbide modifier to the dispersion and stir until homogeneous to obtain a spinning solution;

[0010] S3. The spinning solution is added to an electrospinning apparatus, which includes a multi-channel peristaltic pump connected to a nozzle array. A rotating cylindrical collector is disposed on one side of the nozzle array. The area of ​​the largest cross-section obtained by cutting the rotating cylindrical collector perpendicular to the bottom surface is greater than the area of ​​the plane enclosed by the nozzle array. The closest distance between the nozzle array's ejection end and the rotating cylindrical collector is controlled to be 10-12 cm. The rotation speed of the rotating cylindrical collector is 300-500 rpm, the flow rate of each channel is 0.5-1.5 mL / h, and the spinning voltage is 15-20 KV. The spun fibers are collected and then dried to obtain a nanofiber membrane.

[0011] Furthermore, the polymeric material is at least one of polycaprolactone, polyglycolic acid, polylactic acid, chitosan-polylactic acid copolymer, and polylactic acid-glycolic acid copolymer;

[0012] The solvent is a mixture of dichloromethane and dimethylformamide, with a volume ratio of 2-3:1.

[0013] Furthermore, the mass concentration of the dispersion is 1-12%, preferably 3-10%, and more preferably 5-8%.

[0014] Furthermore, after stirring evenly in S2, a vacuum pump is used to remove air bubbles from the solution for 30-300 minutes to obtain the spinning solution.

[0015] Furthermore, the ratio of the amount of molybdenum carbide added to the mass ratio of the polymer material in the dispersion is 15-20 parts by weight to 80-85 parts by weight.

[0016] Furthermore, the closest distance between the nozzle array's ejection end and the rotating cylindrical collector is 10-12 cm, and the rotating cylindrical collector's rotation speed is 300-500 rpm.

[0017] Furthermore, the flow rate ejected from each channel is 0.5–1.5 mL / h, and the spinning voltage is 15–20 KV.

[0018] Furthermore, the drying process is carried out at 50–80°C for 12–24 hours.

[0019] The present invention also protects the nanofiber membrane prepared by the method for preparing nanofiber membrane for treating photovoltaic aluminum profile wastewater, wherein the nanofiber membrane has a thickness of 10-50 μm, a thickness uniformity of ≥70%, and an arrangement consistency of ≥80%.

[0020] The present invention also protects a photovoltaic aluminum profile wastewater treatment device, comprising the nanofiber membrane.

[0021] Beneficial effects: The method for preparing nanofiber membranes for treating photovoltaic aluminum profile wastewater provided by the present invention adopts a nozzle matrix design combined with a cylindrical collector to achieve multi-channel simultaneous spinning, which can increase the fiber yield per unit time, and the rotating collector improves the uniformity of fiber arrangement, which helps to manufacture high-performance spun fiber membranes.

[0022] Furthermore, in the method for preparing nanofiber membranes for treating photovoltaic aluminum profile wastewater provided by the present invention, by controlling the closest distance between the nozzle array's ejection end and the rotating cylindrical collector to 10-12 cm, the rotation speed of the rotating cylindrical collector to 300-500 rpm, the flow rate ejected from each channel to 0.5-1.5 mL / h, and the spinning voltage to 15-20 KV, the thickness uniformity and arrangement consistency of the nanofiber membrane are improved, resulting in a product thickness uniformity greater than or equal to 85% and an arrangement consistency greater than or equal to 85%.

[0023] Furthermore, in the method for preparing nanofiber membranes for treating wastewater from photovoltaic aluminum profiles provided by the present invention, the modification of polymer materials with molybdenum carbide can improve the ability of nanofiber membranes to remove metal ions from wastewater, especially nickel and tin. Detailed Implementation

[0024] Preferred embodiments of the present invention will now be described in more detail. While preferred embodiments of the present invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Where specific techniques or conditions are not specified in the embodiments, they are performed in accordance with techniques or conditions described in the literature in the art or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products. In the following embodiments, unless otherwise specified, "%" refers to weight percentage.

[0025] The following testing methods are included:

[0026] Thickness Uniformity: Turn on the Keyence LS-9000 film thickness gauge and fix the sensor head on the measurement platform, ensuring the optical axis is perpendicular to the sample. Measure the thickness of the glass substrate without a film. Place the nanofiber film on the glass substrate, correctly positioning it in the measurement area, and start the thickness measurement mode. After using multi-point scanning mode, export the thickness measurement results as a CSV file and open it in table format. Set the allowable deviation range δ = 5%, measure n points, and calculate the measured value h. i With average thickness The absolute value of the difference / the average thickness. Determine how many points n there are. i satisfy Thickness uniformity = n i / n×100%.

[0027] Alignment Consistency: A certain length of nanofiber membrane was taken and laid flat on a 75mm*25mm*1mm glass slide. Using a Nikon ECLIPSE Ci POL polarizing microscope in transmission mode, the orientation light intensity changes of the fibers were observed by adjusting the polarizing mirror angle until the image was clearly visible. The image was imported into ImageJ software, and the fiber outlines were extracted. The direction with the highest number of fibers with consistent orientation was defined as the principal orientation angle, and the orientation angle and number of fibers were calculated. Alignment consistency was quantified using an orientation index: the proportion of fibers within ±10° of the principal orientation angle to the total number of fibers. The closer the orientation index is to 1, the higher the alignment consistency. The formula is: Orientation Index = Number of fibers within ±10° of the principal orientation angle / Total number of fibers in the image.

[0028] Example 1

[0029] A method for preparing a nanofiber membrane for treating wastewater from photovoltaic aluminum profiles includes the following steps:

[0030] S1. Polycaprolactone, a polymeric material, is dispersed in a mixture of dichloromethane and dimethylformamide in a volume ratio of 3:1 to obtain a dispersion with a mass concentration of 8%.

[0031] S2. Add molybdenum carbide modifier to the dispersion. The mass ratio of molybdenum carbide added to the polymer material in the dispersion is 20:80. Stir evenly and then use a vacuum pump to remove air bubbles from the solution. The degassing time is 30 minutes to obtain the spinning solution.

[0032] S3. The spinning solution is added to an electrospinning apparatus, which includes a multi-channel peristaltic pump connected to a nozzle array in a 5×5 rectangular array with a planar area of ​​64 cm². 2 A rotating cylindrical collector with a diameter of 12 cm is provided on one side opposite the nozzle array. The maximum cross-sectional area obtained by cutting the rotating cylindrical collector perpendicular to its bottom surface is 114 cm². 2 The closest distance between the nozzle array's ejection end and the rotating cylindrical collector is controlled to be 10 cm. The rotation speed of the rotating cylindrical collector is 300 rpm. The flow rate of each channel of the multi-channel peristaltic pump is 0.5 mL / h. The spinning voltage is 15 KV. The spun fibers are collected and then dried at 60°C for 24 hours to obtain a nanofiber membrane.

[0033] Example 2

[0034] A method for preparing a nanofiber membrane for treating wastewater from photovoltaic aluminum profiles includes the following steps:

[0035] S1. Polycaprolactone, a polymeric material, is dispersed in a mixture of dichloromethane and dimethylformamide in a volume ratio of 3:1 to obtain a dispersion with a mass concentration of 8%.

[0036] S2. Add molybdenum carbide modifier to the dispersion. The mass ratio of molybdenum carbide added to the polymer material in the dispersion is 20:80. Stir evenly and then use a vacuum pump to remove air bubbles from the solution. The degassing time is 30 minutes to obtain the spinning solution.

[0037] S3. The spinning solution is added to an electrospinning apparatus, which includes a multi-channel peristaltic pump connected to a nozzle array in a 5×5 rectangular array with a planar area of ​​64 cm². 2 A rotating cylindrical collector with a diameter of 12 cm is provided on one side opposite the nozzle array. The maximum cross-sectional area obtained by cutting the rotating cylindrical collector perpendicular to its bottom surface is 114 cm². 2The closest distance between the nozzle array's ejection end and the rotating cylindrical collector is controlled to be 10 cm. The rotation speed of the rotating cylindrical collector is 400 rpm. The flow rate of each channel of the multi-channel peristaltic pump is 0.5 mL / h. The spinning voltage is 15 KV. The spun fibers are collected and then dried at 60°C for 24 hours to obtain a nanofiber membrane.

[0038] Example 3

[0039] A method for preparing a nanofiber membrane for treating wastewater from photovoltaic aluminum profiles includes the following steps:

[0040] S1. Polycaprolactone, a polymeric material, is dispersed in a mixture of dichloromethane and dimethylformamide in a volume ratio of 3:1 to obtain a dispersion with a mass concentration of 8%.

[0041] S2. Add molybdenum carbide modifier to the dispersion. The mass ratio of molybdenum carbide added to the polymer material in the dispersion is 20:80. Stir evenly and then use a vacuum pump to remove air bubbles from the solution. The degassing time is 30 minutes to obtain the spinning solution.

[0042] S3. The spinning solution is added to an electrospinning apparatus, which includes a multi-channel peristaltic pump connected to a nozzle array in a 5×5 rectangular array with a planar area of ​​64 cm². 2 A rotating cylindrical collector with a diameter of 12 cm is provided on one side opposite the nozzle array. The maximum cross-sectional area obtained by cutting the rotating cylindrical collector perpendicular to its bottom surface is 114 cm². 2 The closest distance between the nozzle array's ejection end and the rotating cylindrical collector is controlled to be 10 cm. The rotation speed of the rotating cylindrical collector is 500 rpm. The flow rate of each channel of the multi-channel peristaltic pump is 0.5 mL / h. The spinning voltage is 15 KV. The spun fibers are collected and then dried at 60°C for 24 hours to obtain a nanofiber membrane.

[0043] Example 4

[0044] A method for preparing a nanofiber membrane for treating wastewater from photovoltaic aluminum profiles includes the following steps:

[0045] S1. Polycaprolactone, a polymeric material, is dispersed in a mixture of dichloromethane and dimethylformamide in a volume ratio of 3:1 to obtain a dispersion with a mass concentration of 8%.

[0046] S2. Add molybdenum carbide modifier to the dispersion. The mass ratio of molybdenum carbide added to the polymer material in the dispersion is 20:80. Stir evenly and then use a vacuum pump to remove air bubbles from the solution. The degassing time is 30 minutes to obtain the spinning solution.

[0047] S3. The spinning solution is added to an electrospinning apparatus, which includes a multi-channel peristaltic pump connected to a nozzle array in a 5×5 rectangular array with a planar area of ​​64 cm². 2 A rotating cylindrical collector with a diameter of 12 cm is provided on one side opposite the nozzle array. The maximum cross-sectional area obtained by cutting the rotating cylindrical collector perpendicular to its bottom surface is 114 cm². 2 The closest distance between the nozzle array's ejection end and the rotating cylindrical collector is controlled to be 10 cm. The rotation speed of the rotating cylindrical collector is 500 rpm. The flow rate of each channel of the multi-channel peristaltic pump is 0.5 mL / h. The spinning voltage is 18 KV. The spun fibers are collected and then dried at 60°C for 24 hours to obtain a nanofiber membrane.

[0048] Example 5

[0049] A method for preparing a nanofiber membrane for treating wastewater from photovoltaic aluminum profiles includes the following steps:

[0050] S1. Polycaprolactone, a polymeric material, is dispersed in a mixture of dichloromethane and dimethylformamide in a volume ratio of 3:1 to obtain a dispersion with a mass concentration of 8%.

[0051] S2. Add molybdenum carbide modifier to the dispersion. The mass ratio of molybdenum carbide added to the polymer material in the dispersion is 20:80. Stir evenly and then use a vacuum pump to remove air bubbles from the solution. The degassing time is 30 minutes to obtain the spinning solution.

[0052] S3. The spinning solution is added to an electrospinning apparatus, which includes a multi-channel peristaltic pump connected to a nozzle array in a 5×5 rectangular array with a planar area of ​​64 cm². 2 A rotating cylindrical collector with a diameter of 12 cm is provided on one side opposite the nozzle array. The maximum cross-sectional area obtained by cutting the rotating cylindrical collector perpendicular to its bottom surface is 114 cm². 2The closest distance between the nozzle array's ejection end and the rotating cylindrical collector is controlled to be 10 cm. The rotation speed of the rotating cylindrical collector is 500 rpm. The flow rate of each channel of the multi-channel peristaltic pump is 0.5 mL / h. The spinning voltage is 20 KV. The spun fibers are collected and then dried at 60°C for 24 hours to obtain a nanofiber membrane.

[0053] Example 6

[0054] A method for preparing a nanofiber membrane for treating wastewater from photovoltaic aluminum profiles includes the following steps:

[0055] S1. Polycaprolactone, a polymeric material, is dispersed in a mixture of dichloromethane and dimethylformamide in a volume ratio of 3:1 to obtain a dispersion with a mass concentration of 8%.

[0056] S2. Add molybdenum carbide modifier to the dispersion. The mass ratio of molybdenum carbide added to the polymer material in the dispersion is 20:80. Stir evenly and then use a vacuum pump to remove air bubbles from the solution. The degassing time is 30 minutes to obtain the spinning solution.

[0057] S3. The spinning solution is added to an electrospinning apparatus, which includes a multi-channel peristaltic pump connected to a nozzle array in a 5×5 rectangular array with a planar area of ​​64 cm². 2 A rotating cylindrical collector with a diameter of 12 cm is provided on one side opposite the nozzle array. The maximum cross-sectional area obtained by cutting the rotating cylindrical collector perpendicular to its bottom surface is 114 cm². 2 The closest distance between the nozzle array's ejection end and the rotating cylindrical collector is controlled to be 10 cm. The rotation speed of the rotating cylindrical collector is 500 rpm. The flow rate of each channel of the multi-channel peristaltic pump is 1.0 mL / h. The spinning voltage is 18 KV. The spun fibers are collected and then dried at 60°C for 24 hours to obtain a nanofiber membrane.

[0058] Example 7

[0059] A method for preparing a nanofiber membrane for treating wastewater from photovoltaic aluminum profiles includes the following steps:

[0060] S1. Polylactic acid, a polymeric material, is dispersed in a mixture of dichloromethane and dimethylformamide, with a volume ratio of dichloromethane to dimethylformamide of 2:1, to obtain a dispersion with a mass concentration of 10%.

[0061] S2. Add molybdenum carbide modifier to the dispersion. The mass ratio of molybdenum carbide added to the polymer material in the dispersion is 15:85. Stir evenly and then use a vacuum pump to remove air bubbles from the solution. The degassing time is 30 minutes to obtain the spinning solution.

[0062] S3. The spinning solution is added to an electrospinning apparatus, which includes a multi-channel peristaltic pump connected to a nozzle array in a 5×5 rectangular array with a planar area of ​​64 cm². 2 A rotating cylindrical collector with a diameter of 12 cm is provided on one side opposite the nozzle array. The maximum cross-sectional area obtained by cutting the rotating cylindrical collector perpendicular to its bottom surface is 114 cm². 2 The closest distance between the nozzle array's ejection end and the rotating cylindrical collector is controlled to be 12 cm. The rotation speed of the rotating cylindrical collector is 500 rpm. The flow rate of each channel of the multi-channel peristaltic pump is 1.0 mL / h. The spinning voltage is 18 KV. The spun fibers are collected and then dried at 60°C for 24 hours to obtain a nanofiber membrane.

[0063] Comparative Example 1

[0064] A comparative sample was prepared, referring to Example 4, except that no modifier was added to the dispersion, as detailed below:

[0065] S1. Polycaprolactone, a polymeric material, is dispersed in a mixture of dichloromethane and dimethylformamide in a volume ratio of 3:1 to obtain a dispersion with a mass concentration of 8%.

[0066] S2. Use a vacuum pump to remove air bubbles from the dispersion for 30 minutes to obtain the spinning solution;

[0067] S3. The spinning solution is added to an electrospinning apparatus, which includes a multi-channel peristaltic pump connected to a nozzle array in a 5×5 rectangular array with a planar area of ​​64 cm². 2 A rotating cylindrical collector with a diameter of 12 cm is provided on one side opposite the nozzle array. The maximum cross-sectional area obtained by cutting the rotating cylindrical collector perpendicular to its bottom surface is 114 cm². 2 The closest distance between the nozzle array's ejection end and the rotating cylindrical collector is controlled to be 10 cm. The rotation speed of the rotating cylindrical collector is 200 rpm. The flow rate of each channel of the multi-channel peristaltic pump is 0.5 mL / h. The spinning voltage is 18 KV. The spun fibers are collected and then dried at 60°C for 24 hours to obtain a nanofiber membrane.

[0068] Comparative Example 2

[0069] To prepare a comparative sample, refer to Example 4, except that the rotating cylindrical collector rotates at a lower speed. The specific steps include:

[0070] S1. Polycaprolactone, a polymeric material, is dispersed in a mixture of dichloromethane and dimethylformamide in a volume ratio of 3:1 to obtain a dispersion with a mass concentration of 8%.

[0071] S2. Add molybdenum carbide modifier to the dispersion. The mass ratio of molybdenum carbide added to the polymer material in the dispersion is 20:80. Stir evenly and then use a vacuum pump to remove air bubbles from the solution. The degassing time is 30 minutes to obtain the spinning solution.

[0072] S3. The spinning solution is added to an electrospinning apparatus, which includes a multi-channel peristaltic pump connected to a nozzle array in a 5×5 rectangular array with a planar area of ​​64 cm². 2 A rotating cylindrical collector with a diameter of 12 cm is provided on one side opposite the nozzle array. The maximum cross-sectional area obtained by cutting the rotating cylindrical collector perpendicular to its bottom surface is 114 cm². 2 The closest distance between the nozzle array's ejection end and the rotating cylindrical collector is controlled to be 10 cm. The rotation speed of the rotating cylindrical collector is 200 rpm. The flow rate of each channel of the multi-channel peristaltic pump is 0.5 mL / h. The spinning voltage is 18 KV. The spun fibers are collected and then dried at 60°C for 24 hours to obtain a nanofiber membrane.

[0073] Performance testing

[0074] The nanofiber membrane samples prepared in the examples and comparative examples were tested, and the results are shown in Table 1.

[0075] Table 1. Results of Nanofiber Membrane Performance Testing

[0076]

[0077]

[0078] As shown in Table 1, higher rotation speeds help generate thinner and more uniform films, making them suitable for manufacturing ultrathin nanofiber films. In Comparative Example 2, the film was thicker at a rotation speed of 200 rpm, resulting in decreased thickness uniformity and alignment consistency. Moreover, the film thickness tends to decrease with increasing rotation speed. High voltage may lead to finer fibers. High-speed rotation and high voltage can improve film uniformity and fiber alignment, thereby improving thickness uniformity and alignment consistency.

[0079] Simulated wastewater treatment test

[0080] Simulated wastewater containing nickel and simulated wastewater containing tin were prepared separately. The preparation methods are as follows: Weigh 28.5g of stannous chloride and put it into a 250mL beaker. Add 200mL of deionized water and 1-2 drops of concentrated sulfuric acid. Stir thoroughly until dissolved. Adjust the pH to 7 with 0.1mol / L NaOH solution and 1mol / L dilute sulfuric acid solution. Then transfer it to a 1L volumetric flask and make up to 1L for later use.

[0081] Weigh out 112.1g of nickel sulfate and place it in another 250mL beaker. Add 300mL of deionized water and stir to dissolve. Adjust the pH to 7 with 0.1mol / L NaOH solution and 1mol / L dilute sulfuric acid solution. Then transfer the solution to a 1L volumetric flask and bring the volume to 1L for later use.

[0082] The nanofiber membrane was divided into two equal parts and placed in filter bags. The bags were then placed in filter tanks, and simulated wastewater was introduced into each filter tank (one filter tank treated one type of wastewater). The mixture was treated at room temperature for 10 hours, and the concentration of metal ions in the simulated wastewater after treatment was measured. The results are shown in the table below.

[0083] Table 2 Wastewater Treatment Results

[0084] Example 4 25g / L 15g / L 0.13g / L 0.11g / L Comparative Example 1 25g / L 15g / L 19.89g / L 11.55g / L

[0085] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0086] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0087] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A method for preparing a nanofiber membrane for treating wastewater from photovoltaic aluminum profiles, characterized in that: Includes the following steps: S1. A polymeric material is dispersed in a solvent to obtain a dispersion, wherein the polymeric material is polycaprolactone, the solvent is a mixture of dichloromethane and dimethylformamide, the volume ratio of dichloromethane to dimethylformamide is 2-3:1, and the mass concentration of the dispersion is 1-12%. S2. Add molybdenum carbide modifier to the dispersion. The mass ratio of molybdenum carbide added to the polymer material in the dispersion is 15-20 parts by weight: 80-85 parts by weight. Stir evenly to obtain a spinning solution. S3. The spinning solution is added to an electrospinning apparatus, which includes a multi-channel peristaltic pump connected to a nozzle array. A rotating cylindrical collector is disposed on one side of the nozzle array. The area of ​​the largest cross-section obtained by cutting the rotating cylindrical collector perpendicular to the bottom surface is greater than the area of ​​the plane enclosed by the nozzle array. The closest distance between the nozzle array's ejection end and the rotating cylindrical collector is controlled to be 10-12 cm. The rotation speed of the rotating cylindrical collector is 300 rpm, the flow rate of each channel is 0.5-1.5 mL / h, the spinning voltage is 15 KV, the spun fibers are collected, and then dried at 50-80°C for 12-24 hours to obtain a nanofiber membrane. The thickness of the nanofiber membrane is 10-50 μm, the thickness uniformity is greater than or equal to 85%, and the alignment consistency is greater than or equal to 85%.

2. The method for preparing a nanofiber membrane for treating photovoltaic aluminum profile wastewater according to claim 1, characterized in that: The mass concentration of the dispersion is 3-10%.

3. The method for preparing a nanofiber membrane for treating wastewater from photovoltaic aluminum profiles according to claim 2, characterized in that: The mass concentration of the dispersion is 5-8%.

4. The method for preparing a nanofiber membrane for treating wastewater from photovoltaic aluminum profiles according to claim 2, characterized in that: After stirring evenly in S2, a vacuum pump is used to remove air bubbles from the solution. The degassing time is 30-300 minutes to obtain the spinning solution.

5. The nanofiber membrane prepared by the method for preparing the nanofiber membrane for treating photovoltaic aluminum profile wastewater according to any one of claims 1-4 is characterized in that: The thickness of the nanofiber membrane is 10~50μm, the thickness uniformity is greater than or equal to 85%, and the arrangement consistency is greater than or equal to 85%.

6. A photovoltaic aluminum profile wastewater treatment device, comprising the nanofiber membrane of claim 5.

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