Preparation and application of high-density polyethylene / graphene oxide nanocomposite fiber membrane

Abstract

The application discloses a high-density polyethylene / graphene oxide nanocomposite fiber membrane prepared by electrostatic spinning and application thereof, and belongs to the field of functional fiber materials. The high-density polyethylene / graphene oxide nanocomposite fiber membrane is prepared by electrostatic spinning after graphene oxide powder and high-density polyethylene resin particles are used to prepare a mixed spinning liquid. The prepared fiber membrane has the unique advantages of good pore size distribution, small pore size level, outstanding fiber diameter uniformity and large specific surface area, and can be used as an adsorption membrane for adsorbing and removing arsenic elements in water, and has the advantages of low application condition, low energy consumption, wide application range and no secondary pollution.

Description

Technical Field

[0001] This invention belongs to the field of functional fiber materials, specifically relating to a high-density polyethylene / graphene oxide nanocomposite fiber membrane prepared by electrospinning and its application in the adsorption and removal of arsenic from water. Background Technology

[0002] Electrospinning technology, with its simple equipment, convenient control, and low cost, has been recognized as a simple, universal, and cost-effective method for large-scale production of nanomaterials. Its greatest advantage lies in its ability to easily achieve the composite of multi-component materials through electrospinning. By adjusting and controlling the process parameters during spinning, large quantities of nanofiber materials with diverse morphologies and microporous structures can be produced. These nanofiber materials are widely used in battery energy, healthcare, catalysis, and environmental engineering. The basic principle of electrospinning technology is that under high-voltage electrostatic conditions of 3-1000 kV, the positive electrode is connected to the polymer melt or solution at the needle tip, and the negative electrode is grounded. Under pressure, the melt or liquid dripping will generate surface tension. When the electric field force can overcome the surface tension of the polymer droplet, a Taylor cone with an angle of about 40° will be generated on the surface of the droplet. Due to the continuous action of the electric field force, the charged polymer jet is stretched into a fiber filament with a diameter at the nanometer level, thus realizing the spinning process under high-voltage electrostatic field. During electrospinning, the solvent evaporates under the action of electrostatic field and the solute solidifies into fibers. Finally, a fiber web or film with a diameter of nanometers is collected on the receiving device. Summary of the Invention

[0003] To address the problems of low water recovery rate and membrane fouling in existing arsenic adsorption membranes, this invention proposes a high-density polyethylene / graphene oxide nanocomposite fiber membrane prepared by electrospinning. This membrane has unique advantages such as good pore size distribution, small pore size level, outstanding fiber diameter uniformity, and huge specific surface area, and can be used as an adsorption membrane for the adsorption and removal of arsenic in water.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A high-density polyethylene / graphene oxide nanocomposite fiber membrane prepared by electrospinning includes the following steps:

[0006] 1) Add graphene oxide powder to an organic solvent and disperse it by ultrasonication to obtain a graphene oxide dispersion.

[0007] 2) Add high-density polyethylene resin particles to the graphene oxide dispersion prepared in step 1), and stir at a constant temperature of 80°C until the particles are completely dissolved to obtain a mixed spinning solution of high-density polyethylene / graphene oxide.

[0008] 3) Electrospinning is performed using the mixed spinning solution obtained in step 2) to obtain the high-density polyethylene / graphene oxide nanocomposite fiber membrane.

[0009] Furthermore, the edge oxidation degree of the graphene oxide powder described in step 1) is 4%-10%.

[0010] Further, the organic solvent mentioned in step 1) is decahydronaphthalene, liquid paraffin, or p-xylene.

[0011] Further, the mass concentration of the graphene oxide dispersion in step 1) is 15%~25%.

[0012] Further, in step 2), the mass concentration of high-density polyethylene in the mixed spinning solution is 15%-23%.

[0013] Further, the electrospinning process parameters in step 3) are as follows: the supply rate of the solution by the propulsion pump is 0.5-1.5 ml / h; the negative voltage is 1KV and the positive voltage is 10-20KV; the speed of the roller collector motor is 500-1500 r / min; the spinning temperature is 20-35℃ and the time is 1-3h; the distance from the needle to the roller receiving device is 10-20cm.

[0014] The high-density polyethylene / graphene oxide nanocomposite fiber membrane can be used for the adsorption and removal of arsenic in water.

[0015] Specifically, the high-density polyethylene / graphene oxide nanocomposite fiber membrane is used as an adsorption membrane for the adsorption and removal of arsenic in water.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1) The high-density polyethylene / graphene oxide nanocomposite fiber membrane prepared by electrospinning in this invention has higher hydrophilicity on the surface and inside the pores, which makes water molecules have a strong attraction between the membrane surface and the membrane, forming a protective water layer that can prevent pollutants from adhering and reduce membrane fouling.

[0018] 2) The high-density polyethylene / graphene oxide nanocomposite membrane prepared by electrospinning in this invention has a high pore size ratio, and therefore has a higher efficiency in adsorbing and intercepting pollutants such as arsenic. Attached Figure Description

[0019] Figure 1The images show SEM images of high-density polyethylene fibers prepared from spinning solutions of different mass fractions in Examples 1-4. Images a and b are 5000× and 10000× images for a mass fraction of 15%, images c and d are 5000× and 10000× images for a mass fraction of 18%, images e and f are 5000× and 10000× images for a mass fraction of 20%, and images g and f are 5000× and 10000× images for a mass fraction of 23%.

[0020] Figure 2 The images shown are SEM images of high-density polyethylene fibers prepared by different spinning voltages in Examples 5-7. Images a and b are 5000× and 10000× images at 10 kV, images c and d are 5000× and 10000× images at 13 kV, images e and f are 5000× and 10000× images at 16 kV, and images g and f are 5000× and 10000× images at 19 kV.

[0021] Figure 3 The images shown are SEM images of high-density polyethylene fibers prepared at different spinning flow rates in Examples 8-10. Images a and b are 5000× and 10000× at a feed rate of 0.5 ml / h, images c and d are 5000× and 10000× at a feed rate of 0.8 ml / h, images e and f are 5000× and 10000× at a feed rate of 1.2 ml / h, and images g and f are 5000× and 10000× at a feed rate of 1.5 ml / h.

[0022] Figure 4 The images shown are SEM images of high-density polyethylene / graphene oxide composite fibers prepared in Examples 11-13 with different graphene oxide addition ratios. a and b are 5000× and 10000× images of 0% GO, c and d are 5000× and 10000× images of 0.5% GO, e and f are 5000× and 10000× images of 1.0% GO, and g and f are 5000× and 10000× images of 2.0% GO. Detailed Implementation

[0023] A high-density polyethylene / graphene oxide nanocomposite fiber membrane prepared by electrospinning includes the following steps:

[0024] 1) Add graphene oxide powder to an organic solvent and disperse it by ultrasonication to obtain a graphene oxide dispersion with a mass concentration of 15%~25%.

[0025] 2) Add high-density polyethylene resin particles to the graphene oxide dispersion prepared in step 1), and stir at a constant temperature of 80°C until the particles are completely dissolved to obtain a mixed spinning solution of high-density polyethylene / graphene oxide, wherein the mass concentration of high-density polyethylene is 15%-23%;

[0026] 3) Electrospinning is performed using the mixed spinning solution obtained in step 2) to obtain the high-density polyethylene / graphene oxide nanocomposite fiber membrane.

[0027] The organic solvent mentioned in step 1) is decahydronaphthalene, liquid paraffin, or p-xylene.

[0028] Step 3) The electrospinning process parameters are as follows: the supply rate of the solution by the propulsion pump is 0.5-1.5 ml / h; the negative voltage is 1KV and the positive voltage is 10-20KV; the speed of the roller collector motor is 500-1500 r / min; the spinning temperature is 20-35℃ and the time is 1-3h; the distance from the needle to the roller receiving device is 10-20cm.

[0029] To make the content of this invention easier to understand, the technical solution of this invention will be further described below with reference to specific embodiments, but this invention is not limited thereto.

[0030] The test procedure for arsenate adsorption rate is as follows:

[0031] a. Prepare a sodium arsenate solution with an initial concentration of 300±10 μg / L;

[0032] b. Using a vacuum filtration pump, the sodium arsenate solution is passed through a high-density polyethylene / graphene oxide composite fiber membrane;

[0033] c. Measure the concentration of sodium arsenate solution before and after filtration using an ultraviolet spectrophotometer, and calculate the adsorption efficiency according to the following formula.

[0034] Formula for calculating arsenate adsorption rate: , among which, (C p The concentration of the filtered sodium arsenate solution, C f (Concentration of sodium arsenate solution before filtration)

[0035] Various parameters in the electrospinning process affect the morphology and properties of the final fibers. Therefore, only by determining relatively optimal process parameters can fibers with good microstructure and excellent properties be prepared. The relevant parameters in the electrospinning process can be divided into three categories: solution properties, operating settings, and external environment. Parameters related to the solution properties include solution mass fraction, solution viscosity, and surface tension; parameters related to operating settings include voltage, flow rate, roller speed, and receiving distance; environmental factors include temperature and humidity during the spinning process. These three categories have a crucial impact on the morphology of the nanofibers prepared by electrospinning. In the research process of this invention, multiple experimental examples were conducted with different solution mass fractions, voltages, and flow rates. Example

[0036] 1) Preparation of electrospinning solution: Place high-density polyethylene resin particles in an electric thermostatic drying oven and dry for 2 hours. Then weigh 2.65 g of high-density polyethylene resin particles and add them in batches to a 200 ml flask containing 15 g of p-xylene (add more after some of the high-density polyethylene resin has completely dissolved). Stir evenly on a thermostatic magnetic stirrer at 80 ℃ and 600 rpm for about 8 hours to ensure that all the high-density polyethylene resin particles are fully dispersed in p-xylene, thereby obtaining a high-density polyethylene polymer solution with a mass fraction of 15%.

[0037] 2) Electrospinning preparation of high-density polyethylene (HDPE) fibers: The prepared HDPE solution was loaded into a 10ml disposable syringe with a 0.88mm steel needle and fixed in the feed pump. A layer of tin foil was wrapped around a roller collector to receive the prepared HDPE fibers. The positive terminal of the power supply was connected to the needle of the steel syringe, and the negative terminal was connected to the roller receiving device. The motor of the roller receiving device was turned on. After the roller device reached a speed of 800rpm and rotated steadily, the feed pump was turned on. The feed speed was set to 0.8 ml / h, the negative voltage of the high-voltage power supply was adjusted to 1KV, and the positive voltage was adjusted to 13kV. The distance from the needle to the roller receiving device was 15 cm, the spinning temperature was 25℃, and the spinning time was 3 h. Electrospinning was performed. The HDPE droplets were stretched into fibers under the action of the high-voltage electrostatic field, and then vacuum dried at 50℃ for 2 h to fully evaporate the solvent, thus obtaining HDPE fibers. Example

[0038] Step 1) Prepare a high-density polyethylene polymer solution with a mass fraction of 18%, and perform the remaining operations as in Example 1. Example

[0039] Step 1) Prepare a high-density polyethylene polymer solution with a mass fraction of 20%, and perform the remaining operations as in Example 1. Example

[0040] Step 1) Prepare a high-density polyethylene polymer solution with a mass fraction of 23%, and perform the remaining operations as in Example 1.

[0041] SEM images of the high-density polyethylene fibers prepared in Examples 1-4 are shown below. Figure 1 As shown, the diameter results are shown in Table 1.

[0042] Table 1. Comparison of high-density polyethylene fiber diameters prepared from spinning solutions with different mass fractions

[0043]

[0044] Depend on Figure 1As shown in Table 1, the high-density polyethylene fibers prepared in Example 1 exhibited entanglement, as well as spherical bead-like and flocculent structures. This phenomenon was caused by the low mass fraction of the spinning solution, resulting in low surface tension. The polymer droplets could not be fully stretched into filaments and form good Taylor cones at the needle tip, and the droplets, not fully stretched by the electric field, formed beaded structures on the fibers (a, b). The high-density polyethylene fibers prepared in Example 2 showed reduced bead structures and decreased entanglement between fibers. The nanofibers varied in thickness, and their uniformity needed improvement (c, d). The high-density polyethylene fibers prepared in Example 3 had good morphology, without entanglement, filament bundling, or spherical bead structures, indicating that electrospinning at this mass fraction could yield nanofibers with uniform diameter. The average diameter of the high-density polyethylene fibers prepared in Example 4 was significantly higher than that of the sample in Example 3. Therefore, selecting an appropriate spinning solution concentration not only helps the fibers to fully extend and reduces defects such as beading, but also effectively improves the average diameter and fiber uniformity of electrospun nanofibers, with a mass fraction of 20% showing the best effect. Example

[0045] 1) Preparation of electrospinning solution: Place high-density polyethylene resin particles in an electric thermostatic drying oven and dry for 2 hours. Then weigh 3.75 g of high-density polyethylene resin particles and add them in batches to a 200 ml flask containing 15 g of p-xylene (add more after some of the high-density polyethylene resin has completely dissolved). Stir evenly on a thermostatic magnetic stirrer at 80 ℃ and 600 rpm for about 8 hours to ensure that all high-density polyethylene resin particles are fully dispersed in p-xylene, thereby obtaining a high-density polyethylene polymer solution with a mass fraction of 20%.

[0046] 2) Electrospinning preparation of high-density polyethylene (HDPE) fibers: The prepared HDPE solution was loaded into a 10ml disposable syringe with a 0.88mm steel needle and fixed in the feed pump. A layer of tin foil was wrapped around a roller collector to receive the prepared HDPE fibers. The positive terminal of the power supply was connected to the needle of the steel syringe, and the negative terminal was connected to the roller receiving device. The motor of the roller receiving device was turned on. After the roller device reached a speed of 800rpm and rotated steadily, the feed pump was turned on. The feed speed was set to 0.8 ml / h, the negative voltage of the high-voltage power supply was adjusted to 1KV, and the positive voltage was adjusted to 10kV. The distance from the needle to the roller receiving device was 15 cm, the spinning temperature was 25℃, and the spinning time was 3 h. Electrospinning was performed. The HDPE droplets were stretched into fibers under the action of a high-voltage electrostatic field, and then vacuum dried at 50℃ for 2 h to fully evaporate the solvent, thus obtaining HDPE fibers. Example

[0047] In step 2), adjust the positive voltage of the high-voltage power supply to 16kV, and the rest of the operation is the same as in Example 5.

[0048] The prepared nanocomposite fiber membrane was subjected to arsenate adsorption rate test. The results showed that the permeate concentration of sodium arsenate solution after filtration through the composite membrane was 219.87 μg / L, and the adsorption rate was 26.71%. Example

[0049] In step 2), adjust the positive voltage of the high-voltage power supply to 19kV, and the rest of the operation is the same as in Example 5.

[0050] SEM images of the high-density polyethylene fibers prepared in Examples 5-7 are shown below. Figure 2 As shown, the diameter results are shown in Table 2.

[0051] Table 2 Comparison of high-density polyethylene fiber diameters prepared with different spinning voltages

[0052]

[0053] Depend on Figure 2 As shown in Table 2, the high-density polyethylene fibers prepared in Example 5 exhibited spherical beading defects, resulting in low uniformity of fiber diameter. The high-density polyethylene fibers prepared in Example 6 had a smoother surface and uniform diameter, exhibiting a better overall fiber morphology without beading, tangling, or knotting defects. This indicates that the high-voltage electrostatic field completely overcame the surface tension of the polymer droplets, and the strong electric field provided the jet with greater stretching force and higher acceleration, allowing it to fully extend in the electric field, ultimately producing high-density polyethylene fibers with a smaller diameter. The high-density polyethylene fibers prepared in Example 7 exhibited flocculent defects and tangling. Therefore, the magnitude of the voltage determines the intensity of the electrostatic field during spinning, and the relationship between the electric field intensity and the surface tension of the solution leads to changes in fiber morphology. When the electrostatic field strength is insufficient to overcome the surface tension of the solution, the tensile stress of the electrostatic field is small, the droplets at the needle tip accumulate, and the polymer jet cannot fully extend into fibers in the electrostatic field, forming flocculent and beaded defects. The fiber diameter and uniformity also need to be improved. When the electrostatic field strength far exceeds the surface tension of the droplets, the solvent evaporates rapidly, the Taylor cone is not stable enough, and the excessively fast jet acceleration reduces its time in the electrostatic field, thus forming flocculent structures and filament formation on the fibers. Therefore, a voltage of 16kV is more effective. Example

[0054] 1) Preparation of electrospinning solution: Place high-density polyethylene resin particles in an electric thermostatic drying oven and dry for 2 hours. Then weigh 3.75 g of high-density polyethylene resin particles and add them in batches to a 200 ml flask containing 15 g of p-xylene (add more after some of the high-density polyethylene resin has completely dissolved). Stir evenly on a thermostatic magnetic stirrer at 80 ℃ and 600 rpm for about 8 hours to ensure that all high-density polyethylene resin particles are fully dispersed in p-xylene, thereby obtaining a high-density polyethylene polymer solution with a mass fraction of 20%.

[0055] 2) Electrospinning preparation of high-density polyethylene (HDPE) fibers: The prepared HDPE solution was loaded into a 10ml disposable syringe with a 0.88mm steel needle and fixed in the feed pump. A layer of tin foil was wrapped around a roller collector to receive the prepared HDPE fibers. The positive terminal of the power supply was connected to the needle of the steel syringe, and the negative terminal was connected to the roller receiving device. The motor of the roller receiving device was turned on. After the roller device reached a speed of 800rpm and rotated steadily, the feed pump was turned on. The feed speed was set to 0.5 ml / h, the negative voltage of the high-voltage power supply was adjusted to 1KV, and the positive voltage was adjusted to 16kV. The distance from the needle to the roller receiving device was 15 cm, the spinning temperature was 25℃, and the spinning time was 3 h. Electrospinning was performed. The HDPE droplets were stretched into fibers under the action of a high-voltage electrostatic field, and then vacuum dried at 50℃ for 2 h to fully evaporate the solvent, thus obtaining HDPE fibers. Example

[0056] In step 2), the propulsion speed is set to 1.2 ml / h, and the rest of the operation is the same as in Example 8. Example

[0057] In step 2), the propulsion speed is set to 1.5 ml / h, and the rest of the operation is the same as in Example 8.

[0058] SEM images of the high-density polyethylene fibers prepared in Examples 8-10 are shown below. Figure 3 As shown, the diameter results are shown in Table 3.

[0059] Table 3. Comparison of high-density polyethylene fiber diameters prepared with different spinning flow rates

[0060]

[0061] Depend on Figure 3As shown in Table 3, the high-density polyethylene fibers prepared in Example 8 had slightly insufficient uniformity and exhibited filament bundling. The high-density polyethylene fibers prepared in Example 9 showed a significant increase in diameter and a further decrease in uniformity. The high-density polyethylene fibers prepared in Example 10 exhibited a flocculent structure, with a significant increase in fiber diameter and a further decrease in uniformity. This demonstrates that the flow rate of the spinning solution is directly related not only to the stability of the jet during spinning and the average diameter of the nanofibers, but also to the efficiency of large-scale fiber production. Beyond a certain limit, the fiber diameter increases dramatically. The increased diameter is due to the increased spinning flow rate leading to a larger jet. Since the electric field force and the distance from the jet to the receiving roller are fixed, the solvent evaporation remains constant while the solute increases, resulting in a larger fiber diameter. The main reason for the decreased uniformity and the appearance of a flocculent structure is that the increased flow rate at the needle tip manifests as a larger droplet diameter. Under the same electric field force, the jet cannot split uniformly.

[0062] Taking into account the influence of various spinning process parameters on the microstructure of the fibers, the final selected parameters at room temperature were: a spinning solution mass fraction of 20%, a spinning voltage of 16 kV, a flow rate of 0.8 ml / h, a roller speed of 800 rpm, and a receiving distance of 15 cm. The same process parameters were also applied in the subsequent preparation of the high-density polyethylene / graphene oxide nanocomposite fiber membrane.

[0063] 1) Preparation of high-density polyethylene / graphene oxide electrospinning solution: Weigh graphene oxide powder with an edge oxidation degree of 4-10%, disperse it in p-xylene, and ultrasonically disperse it at 300w for 20min until there are no obvious particles at the bottom of the dispersion liquid. Then add high-density polyethylene particles to the ultrasonically dispersed graphene oxide dispersion to finally obtain an electrospinning solution with a graphene oxide mass fraction of 0.5% and a high-density polyethylene mass fraction of 20%.

[0064] 2) Preparation of high-density polyethylene / graphene oxide nanocomposite fibers by electrospinning: The prepared electrospinning solution was loaded into a 10ml disposable syringe with a 0.88mm steel needle and fixed in the feed pump. A layer of tin foil was wrapped around a roller collector to receive the prepared high-density polyethylene fibers. The positive terminal of the power supply was connected to the needle of the steel syringe, and the negative terminal was connected to the roller receiving device. The motor of the roller receiving device was turned on. After the roller device reached a speed of 800rpm and rotated steadily, the feed pump was turned on. The feed speed was set to 0.8ml / h, the negative voltage of the high-voltage power supply was adjusted to 1KV, and the positive voltage was adjusted to 16kV. The distance from the needle to the roller receiving device was 15cm, the spinning temperature was 25℃, and the spinning time was 3h. Electrospinning was carried out. The high-density polyethylene droplets in the electrospinning solution were stretched into fibers under the action of the high-voltage electrostatic field. After vacuum drying at 50℃ for 2h to fully evaporate the solvent, high-density polyethylene / graphene oxide nanocomposite fibers were obtained.

[0065] The prepared nanocomposite fiber membrane was subjected to arsenate adsorption rate test. The results showed that the permeate concentration of sodium arsenate solution after filtration through the composite membrane was 97.74 μg / L, and the adsorption rate was 67.42%. Example

[0066] In step 1), the electrospinning solution contains 1.0% graphene oxide and 20% high-density polyethylene by mass, and the remaining operations are the same as in Example 11.

[0067] The prepared nanocomposite fiber membrane was subjected to arsenate adsorption rate test. The results showed that the permeate concentration of sodium arsenate solution after filtration through the composite membrane was 60.51 μg / L, and the adsorption rate was 79.83%. Example

[0068] In step 1), the electrospinning solution contains 2.0% graphene oxide and 20% high-density polyethylene by mass, and the remaining operations are the same as in Example 11.

[0069] The prepared nanocomposite fiber membrane was subjected to arsenate adsorption rate test. The results showed that the permeate concentration of sodium arsenate solution after filtration through the composite membrane was 67.05 μg / L, and the adsorption rate was 77.65%.

[0070] SEM images of the high-density polyethylene / graphene oxide nanocomposite fibers prepared in Examples 11-13 are shown below. Figure 4 As shown, the diameter results are shown in Table 4.

[0071] Table 4. Comparison of diameters of high-density polyethylene / graphene oxide nanocomposite fibers prepared with different graphene oxide mass fractions.

[0072]

[0073] Depend on Figure 4 As shown in Table 4, without the addition of graphene oxide, the adsorption of arsenate by the fiber membrane is driven only by pressure, resulting in only a sieving effect and a purely physical adsorption rate of only 26.71%. The high-density polyethylene / graphene oxide nanocomposite fiber membrane prepared with the addition of graphene oxide significantly improved the adsorption rate of arsenic, and this rate increased with increasing graphene oxide content before reaching the adsorption rate limit. When the mass fraction of graphene oxide used was 1%, the adsorption rate reached its maximum of 79.83%, and at this point, the fiber morphology was good, with no obvious defects and uniform pore size. This is because the GO doped in the composite fiber membrane has oxygen-containing hydrophilic functional groups such as hydroxyl and carboxyl groups, which can generate a negative charge on the surface of the fiber membrane. The negative charge of arsenate ions and the negative charge of the functional groups exacerbated the Donan effect. At this point, the filtration mechanism of the fiber membrane included not only the sieving effect of physical adsorption but also the Donan effect of chemical adsorption, ultimately resulting in an increased adsorption rate of arsenate ions.

[0074] In summary, this invention prepares a high-density polyethylene / graphene oxide nanocomposite fiber membrane by electrospinning, which can effectively adsorb arsenic in water.

[0075] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be included in the scope of the present invention.

Claims

1. A method for preparing a high-density polyethylene / graphene oxide nanocomposite fiber membrane, characterized in that, Includes the following steps: 1) Add graphene oxide powder to an organic solvent and disperse it by ultrasonication to obtain a graphene oxide dispersion. 2) Add high-density polyethylene resin particles to the graphene oxide dispersion prepared in step 1), and stir at a constant temperature of 80°C until the particles are completely dissolved to obtain a mixed spinning solution of high-density polyethylene / graphene oxide. 3) Electrospinning is performed using the mixed spinning solution obtained in step 2) to obtain the high-density polyethylene / graphene oxide nanocomposite fiber membrane; The organic solvent mentioned in step 1) is decahydronaphthalene, liquid paraffin, or p-xylene; the mass concentration of the graphene oxide dispersion is 15%~25%; Step 2) The mass concentration of high-density polyethylene in the mixed spinning solution is 15%-23%.

2. The method for preparing the high-density polyethylene / graphene oxide nanocomposite fiber membrane according to claim 1, characterized in that, Step 3) The electrospinning process parameters are as follows: the supply rate of the solution by the propulsion pump is 0.5-1.5 ml / h; the negative voltage is 1KV and the positive voltage is 10-20KV; the speed of the roller collector motor is 500-1500 r / min; the spinning temperature is 20-35℃ and the time is 1-3h; the distance from the needle to the roller receiving device is 10-20cm.

3. A high-density polyethylene / graphene oxide nanocomposite fiber membrane prepared by the preparation method of the high-density polyethylene / graphene oxide nanocomposite fiber membrane as described in claim 1.

4. The application of the high-density polyethylene / graphene oxide nanocomposite fiber membrane as described in claim 3 in the adsorption of arsenic in water.

5. The application of the high-density polyethylene / graphene oxide nanocomposite fiber membrane according to claim 4 in the adsorption of arsenic in water, characterized in that, Specifically, it utilizes the high-density polyethylene / graphene oxide nanocomposite fiber membrane as an adsorption membrane to adsorb and remove arsenic from water.

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