A general-purpose oil-water separation material and a preparation method thereof

Abstract

The present application relates to composite materials, in particular to a general-purpose oil-water separation material and a preparation method thereof.In the present application, the surface of a stainless steel mesh is oxidized and corroded by a mixed solution of ammonium persulfate and sodium hydroxide, and then the oxidized and corroded surface of the stainless steel mesh is reacted with oxalic acid, so that the prepared stainless steel mesh material contains a large number of polar groups on the surface; finally, the stainless steel mesh treated by oxalic acid is soaked in a buffer solution containing dopamine, and the dopamine is self-assembled to the surface of the stainless steel mesh during the solution polymerization process, forming a super-hydrophilic layer.The preparation method is simple and easy to implement; the prepared general-purpose oil-water separation material can be applied to various oil-water separation occasions, and can separate edible oil / water mixtures, petroleum crude oil / water mixtures, mixed organic solvent / water mixtures and the like with complex components.

Description

Technical Field

[0001] This invention relates to composite materials, and more specifically to a general-purpose oil-water separation material and its preparation method. Background Technology

[0002] The most common and widely used method for oil-water separation is membrane separation. Preparing membrane materials with superhydrophilic structures not only allows dense water to pass through rapidly, but their superhydrophilic surfaces can also bind with water molecules to form a hydration layer, reducing the adsorption of oil and organic solvents. This endows the superhydrophilic membrane surface with excellent antifouling and self-cleaning capabilities. Although researchers have conducted extensive research on superhydrophilic materials, their application in the separation and treatment of oily wastewater is still subject to many limitations. For example, most currently prepared superhydrophilic materials can only rapidly separate a limited number of oil-water mixtures.

[0003] Furthermore, oil-water mixtures encountered in real-world accidents, industrial production, and oil extraction often possess complex compositions. Current hydrophilic materials still face challenges in separating oil-water mixtures containing multiple components. Summary of the Invention

[0004] To address the problem that existing oil-water separation materials are inconvenient for separating complex oil-water mixtures, this invention provides a general-purpose oil-water separation material and its preparation method.

[0005] The first aspect of this invention provides a method for preparing a general-purpose oil-water separation material, which includes the following steps:

[0006] The stainless steel mesh was immersed in a mixed solution containing sodium hydroxide and ammonium persulfate;

[0007] The stainless steel mesh was removed and immersed in an oxalic acid solution to obtain a stainless steel mesh oil-water separation material.

[0008] The stainless steel mesh oil-water separation material was immersed in a tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution containing dopamine to obtain a general-purpose oil-water separation material.

[0009] In the mixed solution containing sodium hydroxide and ammonium persulfate, the mass concentration of sodium hydroxide is 3% to 20%, and the mass concentration of ammonium persulfate is 1% to 6%; the mass concentration of oxalic acid solution is 0.2% to 5%; and in the tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution containing dopamine, the mass concentration of dopamine is 0.5% to 4%.

[0010] A second aspect of the present invention provides a general-purpose oil-water separation material, which is obtained by the preparation method of the general-purpose oil-water separation material.

[0011] The third aspect of the present invention provides the application of the general-purpose oil-water separation material in oil-water separation.

[0012] A fourth aspect of the present invention provides an oil-water separation method, comprising the following steps:

[0013] The oil-water mixture is placed on one side of the general-purpose oil-water separator material;

[0014] The water in the oil-water mixture is driven through the general-purpose oil-water separator material.

[0015] The technical solutions of the embodiments of the present invention have the following beneficial effects:

[0016] (1) The stainless steel mesh was sequentially treated with a mixed solution containing sodium hydroxide and ammonium persulfate, an oxalic acid solution, and a tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution containing dopamine, so that polydopamine was coated on the surface of the stainless steel, which enhanced the ability of the general-purpose oil-water separation material to separate complex oil-water mixtures.

[0017] (2) General-purpose oil-water separation materials can quickly and efficiently separate different types of oily wastewater, such as kitchen oil, industrial oil, and organic solvents, with a separation efficiency of over 99% and a separation flux of over 10. 4 ~10 5 Liters per square meter per hour; general-purpose oil-water separation materials can also separate mixtures of mixed edible oil, crude oil, mixed organic solvents and water;

[0018] (3) General-purpose oil-water separation materials have a wide range of oil-water separation effects and are suitable for industrial production. Attached Figure Description

[0019] Figure 1 A scanning electron microscope image of the surface of an untreated stainless steel mesh.

[0020] Figure 2 This is a scanning electron microscope image of the surface of a stainless steel mesh after it has been oxidized and corroded by a mixed solution containing sodium hydroxide and ammonium persulfate.

[0021] Figure 3 This is a scanning electron microscope image of the surface of the stainless steel mesh oil-water separation material in Embodiment 1 of the present invention.

[0022] Figure 4 This is a scanning electron microscope image of the surface of the general-purpose oil-water separation material in Embodiment 3 of the present invention.

[0023] Figure 5 This is a scanning electron microscope image of the cross-section of the general-purpose oil-water separation material in Embodiment 3 of the present invention.

[0024] Figure 6This is an elemental distribution diagram of the surface of the general-purpose oil-water separation material in Embodiment 3 of the present invention.

[0025] Figure 7 The images show the Raman spectra of the stainless steel mesh oil-water separation material of Example 1, the general-purpose oil-water separation material of Example 3, and the untreated stainless steel mesh of the present invention.

[0026] Figure 8 The surface energy spectrum analysis diagrams are those of the stainless steel mesh oil-water separation material in Example 1 and the general-purpose oil-water separation material in Example 3 of the present invention.

[0027] Figure 9 The images show underwater oil contact angle photographs and contact angle data diagrams of the general-purpose oil-water separation materials of Examples 7 to 11 of this invention.

[0028] Figure 10 This is a photograph of the actual separator used in an embodiment of the present invention.

[0029] Figure 11 The figures show the oil-water separation results of Examples 12 to 20 of the present invention.

[0030] Figure 12 The figures show the oil-water separation results of Examples 21 to 25 of the present invention. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] The first aspect of this invention provides a method for preparing a general-purpose oil-water separation material, which includes the following steps:

[0033] The stainless steel mesh was immersed in a mixed solution containing sodium hydroxide and ammonium persulfate;

[0034] The stainless steel mesh was removed and immersed in an oxalic acid solution to obtain a stainless steel mesh oil-water separation material.

[0035] The stainless steel mesh oil-water separation material was immersed in a tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution containing dopamine to obtain a general-purpose oil-water separation material.

[0036] In the mixed solution containing sodium hydroxide and ammonium persulfate, the mass concentration of sodium hydroxide is 10% to 15%, and the mass concentration of ammonium persulfate is 4% to 8%; the mass concentration of oxalic acid solution is 0.5% to 4%; and in the tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution containing dopamine, the mass concentration of dopamine is 0.5% to 4%.

[0037] In practical operation, sodium hydroxide and ammonium persulfate can be dissolved together in a solvent first, and then the stainless steel mesh can be fully immersed in the mixed solution containing sodium hydroxide and ammonium persulfate for etching. After etching, the etched stainless steel mesh is immersed in oxalic acid solution for treatment, and then dried to obtain stainless steel mesh oil-water separation material. The stainless steel mesh oil-water separation material is then self-assembled in a dopamine-containing tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution, and repeatedly rinsed with deionized water and dried to obtain a general-purpose oil-water separation material. After oxidative etching of stainless steel mesh with ammonium persulfate / sodium hydroxide, treatment with oxalic acid can increase the polar groups and hydrophilicity of the stainless steel mesh surface. Then, dopamine is polymerized and assembled on the surface of the stainless steel mesh containing a large number of polar groups by electrostatic force and capillary action. The assembled composite material has superhydrophilicity and can not only quickly separate different types of oily wastewater, but also efficiently separate oil-water mixtures containing complex components.

[0038] In some embodiments, the mass ratio of sodium hydroxide to ammonium persulfate in the mixed solution is 80:20 to 60:40. Preferably, the mass ratio of sodium hydroxide to ammonium persulfate in the mixed solution is 2:1.

[0039] In some embodiments, in the mixed solution containing sodium hydroxide and ammonium persulfate, the mass concentration of sodium hydroxide is 12% and the mass concentration of ammonium persulfate is 6%.

[0040] In some embodiments, the oxalic acid solution has a mass concentration of 1% to 3%. Preferably, the oxalic acid solution has a mass concentration of 2%.

[0041] In some embodiments, the mass concentration of dopamine in the tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution containing dopamine is 1% to 2%.

[0042] In some embodiments, the pH range of the dopamine-containing tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution is 7–10. Preferably, the pH of the dopamine-containing tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution is 8.

[0043] In some embodiments, the stainless steel mesh has an aperture of 600 to 3000 mesh. Preferably, the stainless steel mesh has an aperture of 1000 to 2000 mesh.

[0044] In some embodiments, the stainless steel mesh is immersed in a mixed solution containing sodium hydroxide and ammonium persulfate at 20–70°C for 10–60 hours. Preferably, the stainless steel mesh is immersed in a mixed solution containing sodium hydroxide and ammonium persulfate at 45°C for 36 hours.

[0045] In some embodiments, the stainless steel mesh is removed and immersed in an oxalic acid solution at 20–60°C for 0.25–6 hours. Preferably, the stainless steel mesh is removed and immersed in an oxalic acid solution at 20°C for 0.5 hours.

[0046] In some embodiments, the stainless steel mesh oil-water separation material is immersed in a dopamine-containing tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution at 20–60°C for 4–50 hours. Preferably, the stainless steel mesh oil-water separation material is immersed in a dopamine-containing tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution at 20–40°C for 5–10 hours.

[0047] In some embodiments, the stainless steel mesh, sodium hydroxide, ammonium persulfate, oxalic acid, dopamine, and tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution are industrial-grade or non-industrial-grade products, preferably industrial-grade products.

[0048] It should be noted that stainless steel mesh, sodium hydroxide, ammonium persulfate, oxalic acid, dopamine, and tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution are commonly used materials in this field and there are no special restrictions.

[0049] A second aspect of the present invention provides a general-purpose oil-water separation material, which is obtained by the preparation method of the general-purpose oil-water separation material.

[0050] The third aspect of the present invention provides the application of the general-purpose oil-water separation material in oil-water separation.

[0051] A fourth aspect of the present invention provides an oil-water separation method, comprising the following steps:

[0052] The oil-water mixture is placed on one side of the general-purpose oil-water separator material;

[0053] The water in the oil-water mixture is driven through the general-purpose oil-water separator material.

[0054] In some embodiments, the oil in the oil-water mixture is one or more of toluene, petroleum ether, n-hexane, refrigeration oil, paraffin oil, lubricating oil, rapeseed oil, soybean oil, olive oil, corn oil, peanut oil, and crude petroleum. Preferably, the oil in the oil-water mixture is at least three of toluene, petroleum ether, n-hexane, refrigeration oil, paraffin oil, lubricating oil, rapeseed oil, soybean oil, olive oil, corn oil, peanut oil, and crude petroleum. For example, the oil in the oil-water mixture is a mixture of rapeseed oil, soybean oil, corn oil, peanut oil, and olive oil, or the oil in the oil-water mixture is a mixture of toluene, n-hexane, and petroleum ether.

[0055] In some embodiments, the driving force is gravity or pressure. For example, an oil-water mixture is placed on the universal oil-water separator, allowing water in the mixture to pass through the separator under its own weight. Alternatively, an oil-water mixture is placed on one side of the universal oil-water separator, and pressure is applied to it, causing water in the mixture to pass through the separator.

[0056] The following are some typical embodiments. In the following embodiments, all raw materials used are commercially available products.

[0057] Example 1

[0058] 12g of sodium hydroxide and 6g of ammonium persulfate were fully dissolved in 82g of water to obtain a mixed solution containing sodium hydroxide and ammonium persulfate. A stainless steel mesh with a 1000-mesh aperture was immersed in the mixed solution for etching at a temperature of 45℃ for 36 hours to obtain an etched stainless steel mesh. 2g of oxalic acid was fully dissolved in 98g of water, and the etched stainless steel mesh was then immersed in the oxalic acid solution at a temperature of 45℃ for 0.5 hours to obtain an oil-water separation material for the stainless steel mesh.

[0059] Examples 2 to 6

[0060] 12g of sodium hydroxide and 6g of ammonium persulfate were fully dissolved in 82g of water to obtain a mixed solution containing sodium hydroxide and ammonium persulfate. A stainless steel mesh with a pore size of 1000 mesh was immersed in the mixed solution for etching at a temperature of 45℃ for 36 hours to obtain an etched stainless steel mesh. 2g of oxalic acid was fully dissolved in 98g of water, and the etched stainless steel mesh was then immersed in the oxalic acid solution at a temperature of 45℃ for 0.5 hours to obtain a stainless steel mesh oil-water separation material. 0.4g of dopamine was dissolved in 40mL of tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution (Aladdin Industrial product), and the pH was adjusted to between 8 and 9. A 2cm×2cm stainless steel mesh oil-water separation material was immersed in the dopamine-containing tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution at 45℃ for 6 hours to obtain a polydopamine-coated stainless steel mesh composite material, i.e., a general-purpose oil-water separation material.

[0061] Different embodiments were obtained by changing the amount of dopamine used, and the specific parameters are listed in Table 1.

[0062] Table 1. Dopamine dosage and soaking time

[0063] Sample Name Dopamine (g) Tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution (mL) Soaking time (h) Example 1 0 0 0 Example 2 0.2 40 6 Example 3 0.4 40 6 Example 4 0.8 40 6 Example 5 1.2 40 6 Example 6 1.6 40 6

[0064] Surface analysis was performed using scanning electron microscopy (SEM) on untreated stainless steel mesh, etched stainless steel mesh, the stainless steel mesh oil-water separation material obtained in Example 1, and the general-purpose oil-water separation material obtained in Example 3. The results showed that the surface of the untreated stainless steel mesh was generally smooth (see...). Figure 1 After etching with a mixed solution containing sodium hydroxide and ammonium persulfate, the stainless steel surface exhibits numerous upright or horizontal petal-like structures (see...). Figure 2 In the SEM image of the stainless steel mesh oil-water separation material in Example 1, the petal-like structure disappears, and the surface has a large number of uneven blocky structures (see...). Figure 3 In the SEM image of the general-purpose oil-water separation material in Example 3, the blocky structure disappears, and the surface becomes a continuous undulating structure (see...). Figure 4 Analysis of the cross-section of the general-purpose oil-water separation material in Example 3 revealed that the thickness of the dopamine-loaded layer on the stainless steel surface was approximately 500 nanometers (see Example 3). Figure 5 ).

[0065] Surface elemental analysis of the general-purpose oil-water separation material prepared in Example 3 showed that carbon, oxygen, and nitrogen were uniformly distributed, indicating that polydopamine was successfully and uniformly loaded onto the stainless steel mesh surface (see...). Figure 6 ).

[0066] As the concentration of dopamine gradually increases, the thickness of polydopamine loaded on the surface of the stainless steel mesh tends to increase.

[0067] Raman spectroscopy was used to characterize the untreated stainless steel mesh, the stainless steel mesh oil-water separation material obtained in Example 1, and the general-purpose oil-water separation material obtained in Example 3. The test results are as follows: Figure 7 As shown. In the Raman spectrum, it is located at 1543 cm⁻¹. -1 1402cm -1 1208cm -1 979cm -1 The signals at these locations correspond to the stretching vibrations of the imine group (C=N) in the pyrrole ring, the stretching vibrations of the phenolic hydroxyl group, and the carbon-carbon single bond on the benzene ring, respectively. C–C The bending vibration of C and the rocking vibration of C are both signal peaks originating from polydopamine on the surface of the stainless steel mesh in Example 3. These signals were not observed in the Raman spectra of the untreated stainless steel mesh and the oil-water separation material of the stainless steel mesh in Example 1. This indicates that polydopamine was successfully loaded onto the surface of the stainless steel mesh in Example 3.

[0068] X-ray photoelectron spectroscopy (XPS) analysis was performed on the stainless steel mesh oil-water separation material obtained in Example 1 and the general-purpose oil-water separation material obtained in Example 3. The results are shown in the figure. Figure 8 In Example 1, the energy dispersive spectroscopy (EDS) of the stainless steel mesh oil-water separation material showed strong C and O signals, indicating that a large number of polar groups had formed on the surface of the stainless steel mesh. In Example 3, the EDS of the general-purpose oil-water separation material showed not only C and O signals but also N and Cl signals, indicating that polydopamine was successfully loaded onto the surface of the stainless steel mesh.

[0069] Examples 7 to 11

[0070] The general-purpose oil-water separation material prepared in Example 3 was soaked for a period of time under different environmental conditions. The different environmental conditions and treatment times are listed in Table 2.

[0071] Table 2 Different Environmental Treatment Conditions

[0072] Sample Name Example 7 Example 8 Example 9 Example 10 Example 11 Treatment solution tap water 5% NaCl 0.1M HCl 0.1M NaOH ultrasound Processing time 48h 48h 48h 48h 30min

[0073] Underwater oil contact angle analysis was performed on the oil-water separation materials treated in Examples 7-11. The results are shown in [Figure Number]. Figure 9After treatment in tap water for 48 hours, the underwater oil contact angle of the general-purpose oil-water separator in Example 7 was 159.1°; after treatment in 5% NaCl for 48 hours, the underwater oil contact angle of the general-purpose oil-water separator in Example 8 was 161.0°; after treatment in 0.1M HCl for 48 hours, the underwater oil contact angle of the general-purpose oil-water separator in Example 9 was 159.9°; after treatment in 0.1M NaCl for 48 hours, the underwater oil contact angle of the general-purpose oil-water separator in Example 10 was 153.4°; and after ultrasonic treatment for 30 minutes, the underwater oil contact angle of the general-purpose oil-water separator in Example 11 was 147.2°. This demonstrates that the oil-water separator prepared in Example 3 of the present invention has strong resistance to acid, alkali, and salt corrosion.

[0074] Examples 12 to 20

[0075] The general-purpose oil-water separation material prepared in Example 3 was cut into 2cm × 2cm blocks for oil-water separation experiments. First, corn oil was mixed with water at a ratio of 1:9 to obtain an oil-water mixture. The general-purpose oil-water separation material prepared in Example 3 was used as a separation membrane and installed on a separator. The separator structure is as follows: Figure 10 As shown. 100 mL of oil-water mixture was poured into the separator from the top for oil-water separation experiment. The water flux was calculated using Formula 1, and the oil-water separation efficiency was calculated using Formula 2.

[0076] Separation flux (Flux) = V / St (1)

[0077] Where V represents the volume of water passing through the separator, in liters; S represents the effective cross-sectional area of ​​the oil-water separation material during the separation process, in square meters; and t represents the time of oil-water separation, in hours.

[0078] Separation efficiency (SE)% = (1-C) f / C0)(2)

[0079] Among them, C f C0 represents the weight of the oil after separation, while C0 represents the weight of the oil before separation.

[0080] Repeat the above separation experiment 10 times and calculate the average separation flux and separation efficiency.

[0081] By conducting separation experiments with different types of oil, a series of different separation flux and separation efficiency data can be obtained, and the specific parameters are shown in Table 3.

[0082] Table 3 Specific parameters of different oil-water mixtures

[0083] Example Oil types Oil usage (mL) Water usage (mL) Example 12 corn oil 10 90 Example 13 lubricating oil 10 90 Example 14 Peanut oil 10 90 Example 15 olive oil 10 90 Example 16 paraffin oil 10 90 Example 17 petroleum ether 10 90 Example 18 n-Hexane 10 90 Example 19 Refrigeration oil 10 90 Example 20 Crude oil 10 90

[0084] like Figure 11As shown in the figure, the separation results indicate that the separation flux for all oils is between 10. 4 ~10 5 Between liters per square hour, the maximum water flux for separating a mixture of n-hexane and water can reach 1.7 × 10⁻⁶. 5 The average separation flux of crude oil also reached 3.5 × 10⁻⁶ liters per square hour. 4 Liters per square hour. Except for crude oil, where the separation efficiency fluctuates significantly (99%-95%), the separation efficiency of most oils fluctuates very little and is all above 99.5%.

[0085] Examples 21 to 23

[0086] The general-purpose oil-water separation material prepared in Example 3 was cut into 2cm × 2cm blocks for oil-water separation experiments. First, rapeseed oil was mixed with water in a 5:5 ratio to obtain an oil-water mixture. The general-purpose oil-water separation material prepared in Example 3 was used as a separation membrane and installed on the separator. 100mL of the oil-water mixture was poured into the separator from the top for the oil-water separation experiment. The water flux was calculated using Formula 1, and the oil-water separation efficiency was calculated using Formula 2.

[0087] Repeat the above separation experiment 10 times and calculate the average separation flux and separation efficiency.

[0088] By conducting separation experiments with different types of oil, a series of different separation flux and separation efficiency data can be obtained, and the specific parameters are shown in Table 4.

[0089] Example 24

[0090] The general-purpose oil-water separation material prepared in Example 3 was cut into 2cm × 2cm blocks for oil-water separation experiments. First, rapeseed oil, soybean oil, corn oil, peanut oil, and olive oil were mixed in equal volumes to obtain a mixed oil. Then, the mixed oil was mixed with water in a 5:5 ratio to obtain a mixed oil / water mixture. The general-purpose oil-water separation material prepared in Example 3 was used as a separation membrane and installed on a separator. 100mL of the mixed oil-water mixture was poured into the separator from the top for oil-water separation experiments. The water flux was calculated using Formula 1, and the oil-water separation efficiency was calculated using Formula 2.

[0091] Repeat the above separation experiment 10 times and calculate the average separation flux and separation efficiency.

[0092] Example 25

[0093] The general-purpose oil-water separation material prepared in Example 3 was cut into 2cm × 2cm blocks for oil-water separation experiments. First, toluene, n-hexane, and petroleum ether were mixed evenly by volume to obtain a mixed solvent. Then, the mixed solvent was mixed with water in a 5:5 ratio to obtain a mixture of mixed solvent and water. The general-purpose oil-water separation material prepared in Example 3 was used as a separation membrane and installed on a separator. 100mL of the mixed solvent / water mixture was poured into the separator from the top for oil-water separation experiments. The water flux was calculated using Formula 1, and the oil-water separation efficiency was calculated using Formula 2.

[0094] Repeat the above separation experiment 10 times and calculate the average separation flux and separation efficiency.

[0095] The specific parameters of the different types of oil-water separation experiments in Examples 21 to 25 are shown in Table 4.

[0096] Table 4 Specific parameters of different oil-water mixtures

[0097] Example Oil types Oil dosage (mL) Water usage (mL) Example 21 rapeseed oil 50 50 Example 22 soybean oil 50 50 Example 23 Toluene 50 50 Example 24 Mixed oil 50 50 Example 25 Mixed solvents 50 50

[0098] like Figure 12 As shown, the separation results obtained indicate that the separation flux of all oils in Examples 21 to 25 is between 8.0 × 10⁻⁶. 4 ~1.6×10 5 Between liters per square hour; when separating mixtures of mixed solvents and water, the maximum water flux can reach 1.5 × 10⁻⁶. 5 The average water separation flux in the mixture of oil and water reached 9.0 × 10⁻⁶ liters per square hour; 4 The separation efficiency was higher than 99.5% in all embodiments, and remained relatively stable.

[0099] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any form or substance. It should be noted that those skilled in the art can make various improvements and additions without departing from the method of the present invention, and these improvements and additions should also be considered within the scope of protection of the present invention. Any modifications, alterations, and equivalent changes made by those skilled in the art based on the above-disclosed technical content without departing from the spirit and scope of the present invention are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, and evolutions made to the above embodiments based on the essential technology of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a general-purpose oil-water separation material, characterized in that, Includes the following steps: At 20~70℃, stainless steel mesh is immersed in a mixed solution containing sodium hydroxide and ammonium persulfate for 10~60 hours. The stainless steel mesh is removed and immersed in an oxalic acid solution at 20~60℃ for 0.25~6 hours to obtain a stainless steel mesh oil-water separation material. The stainless steel mesh oil-water separation material is immersed in a dopamine-containing tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution at 20~60℃ for 4~50h to obtain a general-purpose oil-water separation material. In the mixed solution containing sodium hydroxide and ammonium persulfate, the mass concentration of sodium hydroxide is 10%~15%, and the mass concentration of ammonium persulfate is 4%~8%; the mass concentration of the oxalic acid solution is 1%~3%; in the tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution containing dopamine, the mass concentration of dopamine is 1%~4%; and the pH range of the tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution containing dopamine is 7~10. The general-purpose oil-water separation material is resistant to acid, alkali, and salt corrosion.

2. The method according to claim 1, characterized in that, In the dopamine-containing tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution, the mass concentration of dopamine is 1% to 2%.

3. A general-purpose oil-water separation material, characterized in that, It is obtained by the preparation method of the general-purpose oil-water separation material according to any one of claims 1 to 2.

4. The application of the general-purpose oil-water separation material according to claim 3 in oil-water separation.

5. An oil-water separation method, characterized in that, Includes the following steps: The oil-water mixture is placed on one side of the general-purpose oil-water separation material as described in claim 3; The water in the oil-water mixture is driven through the general-purpose oil-water separator material.

6. The method according to claim 5, characterized in that, The oil in the oil-water mixture is one or more of the following: toluene, petroleum ether, n-hexane, refrigeration oil, paraffin oil, lubricating oil, rapeseed oil, soybean oil, olive oil, corn oil, peanut oil, and crude petroleum.

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