Super-hydrophobic sponge as well as preparation method and application thereof
By growing covalent organic frame materials on the surface of melamine sponge, superhydrophobic sponge is modified to form, which solves the problem that existing melamine sponges cannot effectively separate oil and water, and achieves efficient oil and water separation and adsorption performance.
Patent Information
- Application Number
- CN202510281801.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2025-06-10
AI Technical Summary
The existing melamine sponges are oil-water amphiphilic, and cannot effectively separate oil-water, making it difficult to treat oil-containing sewage.
By performing the Schiff base reaction of aldehyde and amino groups on the surface of the melamine sponge, the covalent organic frame material is grown, and the melamine sponge is modified to form a superhydrophobic sponge.
The stable hydrophobic properties of superhydrophobic sponges are achieved, and excellent adsorption properties and cycle stability for different oils and toxic organic solvents are provided, so as to effectively separate oil and water.
Smart Images
Figure CN120118385A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of the preparation and application of functional materials, and relates to a superhydrophobic sponge and its preparation method and application, specifically to a superhydrophobic sponge based on covalent organic framework materials and its preparation method and application. Background Art
[0002] Oil-water separation materials play a crucial role in modern industry and environmental protection. With the acceleration of the global industrialization process, oil pollutants in liquid waste have become an important environmental problem. These pollutants not only affect the transparency of water and biodiversity, but also pose a potential threat to human health. Therefore, effective oil-water separation is crucial for treating industrial wastewater, oily wastewater, and managing oil spills in emergency situations. Traditional methods such as chemical precipitation and physical filtration are hindered by low efficiency and complex operation. Therefore, it is urgent to research and develop new oil-water separation materials.
[0003] Melamine sponge is a widely used commercial material, which has the advantages of low cost, light weight, rich pores, and strong durability. However, ordinary melamine has amphiphilicity for oil and water and cannot effectively separate oil and water.
[0004] Therefore, in this field, it is desired to develop a modified melamine sponge with hydrophobic and oleophilic properties to treat oily sewage. Summary of the Invention
[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a superhydrophobic sponge and its preparation method and application, specifically to provide a superhydrophobic sponge based on covalent organic framework materials and its preparation method and application. That is, aiming at the defects and deficiencies of the low hydrophobicity of current hydrophobic materials, the present invention provides a preparation method of a superhydrophobic sponge. Using a melamine sponge as a substrate, first, the Schiff base reaction of aldehyde groups and amino groups is used for gentle growth on the surface of the sponge to obtain a melamine sponge modified and decorated with covalent organic framework materials, and then further washed and dried to obtain the superhydrophobic sponge.
[0006] To achieve the purpose of this invention, the present invention adopts the following technical solutions:
[0007] In the first aspect, the present invention provides a preparation method of a superhydrophobic sponge, and the preparation method includes the following steps:
[0008] Mix 2,5-bis(2-propynyloxy)-1,4-benzenedicarboxaldehyde and 1,3,5-tris(4-aminophenyl)benzene, then add an organic solvent, mix again, and then add an acetic acid aqueous solution to obtain a mixed solution. Subsequently, immerse the melamine sponge into the mixed solution, let it stand, and perform post-treatment to obtain the superhydrophobic sponge.
[0009] The present invention synthesizes a covalent organic framework material with hydrophobic properties. This material is covalently linked by 2,5-bis(prop-2-yn-1-yloxy)benzene-1,4-dicarbaldehyde and 1,3,5-tris(4-aminophenyl)benzene, and is used to modify the hydrophilic melamine sponge to make it hydrophobic. Since the melamine sponge has abundant pore channels and amino functional groups, it can be used as a substrate material and trigger the in-situ growth of the covalent organic framework material. The preparation method provided by the present invention is simple, and the prepared superhydrophobic sponge has stable superhydrophobic performance, excellent adsorption performance and cycle stability for different oils and toxic organic solvents, etc., which has important scientific significance and practical application value for realizing oil-water separation.
[0010] In the present invention, the melamine sponge is a commercially available melamine sponge and can be directly purchased.
[0011] Preferably, the mass ratio of 2,5-bis(prop-2-yn-1-yloxy)benzene-1,4-dicarbaldehyde to 1,3,5-tris(4-aminophenyl)benzene is 1:(0.8 - 1.2), such as 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2, etc.
[0012] Preferably, the organic solvent includes dimethyl sulfoxide.
[0013] Preferably, based on the amount of 2,5-bis(prop-2-yn-1-yloxy)benzene-1,4-dicarbaldehyde being 7.5 - 30 mg (such as 7.5 mg, 10 mg, 12 mg, 14 mg, 16 mg, 18 mg, 20 mg, 22 mg, 22.5 mg, 24 mg, 26 mg, 28 mg, 30 mg, etc.), the amount of the organic solvent is 2 - 20 mL, such as 2 mL, 3 mL, 5 mL, 8 mL, 9 mL, 10 mL, 12 mL, 14 mL, 15 mL, 16 mL, 18 mL, 20 mL, etc.
[0014] Preferably, the way of remixing includes ultrasonic treatment.
[0015] Preferably, the concentration of the acetic acid aqueous solution is 0.5 - 8 mol / L, such as 0.5 mol / L, 1 mol / L, 2 mol / L, 3 mol / L, 4 mol / L, 5 mol / L, 6 mol / L, 7 mol / L, 8 mol / L, etc.
[0016] Preferably, based on the amount of 2,5-bis(2-propynyloxy)-1,4-benzenedicarbaldehyde being 7.5 - 30 mg (such as 7.5 mg, 10 mg, 12 mg, 14 mg, 16 mg, 18 mg, 20 mg, 22 mg, 22.5 mg, 24 mg, 26 mg, 28 mg, 30 mg, etc.), the amount of the aqueous acetic acid solution is 300 - 1200 μL, such as 300 μL, 400 μL, 500 μL, 600 μL, 700 μL, 800 μL, 900 μL, 1000 μL, 1100 μL, 1200 μL, etc.
[0017] Preferably, the addition of the aqueous acetic acid solution is carried out under stirring conditions.
[0018] Preferably, the stirring includes magnetic stirring.
[0019] Preferably, after the addition of the aqueous acetic acid solution, it further includes the step of continuing to stir for 1 - 30 min (such as 1 min, 2 min, 3 min, 5 min, 8 min, 10 min, 12 min, 13 min, 15 min, 18 min, 20 min, 22 min, 23 min, 25 min, 28 min, 30 min, etc.).
[0020] Preferably, before the melamine sponge is immersed in the mixed solution, it further includes the following pretreatment steps:
[0021] Cut the melamine sponge into pieces, wash, and dry it.
[0022] Preferably, the volume of the melamine sponge after being cut into pieces is 1.0*1.0*1.0 cm to 2.0*2.0*2.0 cm.
[0023] Preferably, the washing includes washing with ethanol and pure water.
[0024] Preferably, the temperature for standing is 20 - 30 °C, such as 20 °C, 25 °C, 30 °C, etc.
[0025] Preferably, the time for standing is 2 - 48 h, such as 2 h, 4 h, 6 h, 8 h, 10 h, 12 h, 16 h, 20 h, 24 h, 28 h, 32 h, 36 h, 40 h, 44 h, 48 h, etc.
[0026] Preferably, the post-treatment includes washing and drying.
[0027] Preferably, the washing includes washing with ethanol.
[0028] As a preferred technical solution of the present invention, the preparation method includes the following steps:
[0029] (1) Cut the melamine sponge into pieces, wash, and dry it.
[0030] (2) Mix 2,5-bis(2-propynyloxy)-1,4-benzenedicarboxaldehyde and 1,3,5-tris(4-aminophenyl)benzene, then add an organic solvent, and ultrasonically treat until the solution is uniformly dispersed. After that, add an aqueous acetic acid solution with a concentration of 0.5 - 8 mol / L under magnetic stirring, continue stirring for 1 - 30 min after adding, to obtain a mixed solution. Subsequently, immerse the melamine sponge into the mixed solution, let it stand at 20 - 30 °C for 2 - 48 h, take out the treated melamine sponge, wash and dry it to obtain the superhydrophobic sponge.
[0031] In a second aspect, the present invention provides a superhydrophobic sponge, which is prepared by the preparation method as described in the first aspect.
[0032] In a third aspect, the present invention provides an application of the superhydrophobic sponge as described in the second aspect in adsorbing oil stains. The superhydrophobic sponge provided by the present invention can effectively separate oil-water mixtures and can selectively adsorb oil stains in water.
[0033] Compared with the prior art, the present invention has the following beneficial effects:
[0034] (1) The present invention selects 2,5-bis(2-propynyloxy)-1,4-benzenedicarboxaldehyde with terminal alkyne groups as the substance for reducing surface energy. It is respectively connected with 1,3,5-tris(4-aminophenyl) and the melamine sponge to form a whole. 2,5-bis(2-propynyloxy)-1,4-benzenedicarboxaldehyde and 1,3,5-tris(4-aminophenyl)benzene are covalently connected to form an organic framework material. During the formation process of this framework material, through partial aldehyde groups, it combines with the amino groups of the sponge and then adheres to the sponge skeleton to obtain the superhydrophobic sponge.
[0035] (2) The superhydrophobic sponge obtained by the present invention has excellent oil-water separation effect, which has important scientific significance and practical application value for realizing oil-water separation. Description of the Drawings
[0036] Figure 1 It is a diagram of the contact angle test results of the superhydrophobic sponge prepared in Example 2.
[0037] Figure 2 (a) and Figure 2 (b) are respectively SEM diagrams of the unmodified melamine sponge provided in Comparative Example 1 and the superhydrophobic sponge prepared in Example 2.
[0038] Figure 3 (a) and Figure 3(b) are the test result graphs of the hydrophobic properties of the unmodified melamine sponge provided in Comparative Example 1 and the superhydrophobic sponge prepared in Example 2, respectively.
[0039] Figure 4 Trichloromethane was selected to simulate heavy oil, and the oil-water separation test process and test result graphs of the superhydrophobic sponge prepared in Example 2 are shown.
[0040] Figure 5 n-Hexadecane was selected to simulate light oil, and the oil-water separation test process and test result graphs of the superhydrophobic sponge prepared in Example 2 are shown.
[0041] Figure 6 The continuous oil-water separation ability test process and test result graphs of the superhydrophobic sponge prepared in Example 2 are shown.
[0042] Figure 7 The adsorption result graphs of the superhydrophobic sponge prepared in Example 2 for different oil samples are shown.
[0043] Figure 8 The adsorption result graphs of the superhydrophobic sponge prepared in Example 1 for different oil samples are shown.
[0044] Figure 9 The adsorption result graphs of the superhydrophobic sponge prepared in Example 3 for different oil samples are shown.
[0045] Figure 10 The adsorption result graphs of the superhydrophobic sponge prepared in Example 4 for different oil samples are shown. Detailed implementation manners
[0046] The technical solutions of the present invention will be further described below through specific implementation manners. Those skilled in the art should understand that the embodiments are only for helping to understand the present invention and should not be regarded as specific limitations to the present invention.
[0047] The chemical reagents and solvents used in the following embodiments of the present invention are all of analytical grade; the raw materials can be purchased from chemical reagent companies or biopharmaceutical companies; the stirring is carried out by a magnetic stirrer.
[0048] Example 1
[0049] In this example, a preparation method of a superhydrophobic sponge is provided, and the preparation method includes the following steps:
[0050] (1) Take a melamine sponge, cut it into sponge small pieces of 1.0*1.0*1.0 cm, wash it several times with ethanol and pure water, and dry it for later use.
[0051] (2) Add 7.5 mg of 2,5-bis(2-propynyloxy)-1,4-benzenedicarboxaldehyde and 7.5 mg of 1,3,5-tris(4-aminophenyl)benzene into a glass beaker, add 5 mL of dimethyl sulfoxide, ultrasonically treat until the solution is uniformly dispersed, then add 300 μL of 6 mol / L acetic acid aqueous solution into the system under magnetic stirring, and keep stirring for 3 min to obtain a mixed solution. Subsequently, immerse the melamine sponge treated in step (1) into the mixed solution, let it stand at 25 °C for 8 h, take out the treated melamine sponge, wash it three times with ethanol, and then dry it in an oven at 60 °C to obtain the superhydrophobic sponge.
[0052] Example 2
[0053] In this example, a preparation method of a superhydrophobic sponge is provided. The preparation method includes the following steps:
[0054] (1) Take a melamine sponge, cut it into sponge pieces of 2.0 * 2.0 * 2.0 cm, wash it several times with ethanol and pure water, and dry it for later use.
[0055] (2) Add 7.5 mg of 2,5-bis(2-propynyloxy)-1,4-benzenedicarboxaldehyde and 7.5 mg of 1,3,5-tris(4-aminophenyl)benzene into a glass beaker, add 9 mL of dimethyl sulfoxide, ultrasonically treat until the solution is uniformly dispersed, then add 300 μL of 6 mol / L acetic acid aqueous solution into the system under magnetic stirring, and keep stirring for 3 min to obtain a mixed solution. Subsequently, immerse the melamine sponge treated in step (1) into the mixed solution, let it stand at 25 °C for 12 h, take out the treated melamine sponge, wash it three times with ethanol, and then dry it in an oven at 60 °C to obtain the superhydrophobic sponge.
[0056] Example 3
[0057] In this example, a preparation method of a superhydrophobic sponge is provided. The preparation method includes the following steps:
[0058] (1) Take a melamine sponge, cut it into sponge pieces of 2.0 * 2.0 * 2.0 cm, wash it several times with ethanol and pure water, and dry it for later use.
[0059] (2) Add 22.5 mg of 2,5-bis(2-propynyloxy)-1,4-benzenedicarboxaldehyde and 22.5 mg of 1,3,5-tris(4-aminophenyl)benzene into a glass beaker, add 15 mL of dimethyl sulfoxide, ultrasonically treat until the solution is uniformly dispersed, then add 900 μL of 6 mol / L acetic acid aqueous solution into the system under magnetic stirring, and keep stirring for 3 min to obtain a mixed solution. Subsequently, immerse the melamine sponge treated in step (1) into the mixed solution, let it stand at 25 °C for 12 h, take out the treated melamine sponge, wash it three times with ethanol, and then dry it in an oven at 60 °C to obtain the superhydrophobic sponge.
[0060] Example 4
[0061] In this example, a preparation method of a superhydrophobic sponge is provided. The preparation method includes the following steps:
[0062] (1) Take a melamine sponge, cut it into sponge pieces of 2.0 * 2.0 * 2.0 cm, wash it several times with ethanol and pure water, and dry it for use.
[0063] (2) Add 30 mg of 2,5-bis(2-propynyloxy)-1,4-benzenedicarboxaldehyde and 30 mg of 1,3,5-tris(4-aminophenyl)benzene into a glass beaker, add 20 mL of dimethyl sulfoxide, ultrasonically treat until the solution is uniformly dispersed, then add 1200 μL of 6 mol / L acetic acid aqueous solution into the system under magnetic stirring, and keep stirring for 3 min to obtain a mixed solution. Subsequently, immerse the melamine sponge treated in step (1) into the mixed solution, let it stand at 25 °C for 24 h, take out the treated melamine sponge, wash it three times with ethanol, and then dry it in an oven at 60 °C to obtain the superhydrophobic sponge.
[0064] Comparative Example 1
[0065] The difference between this comparative example and Example 2 is only that step (2) is not included, that is, this comparative example provides an unmodified melamine sponge.
[0066] Perform a contact angle test on the superhydrophobic sponge prepared in Example 2 of the present invention. The test solvent is water. The contact angle test result diagram is as Figure 1 shown. The contact angle of the superhydrophobic sponge is 150.3°, indicating its excellent hydrophobic performance. Using the same method, perform a contact angle test on the superhydrophobic sponges prepared in Example 1, Example 3, Example 4 and the unmodified melamine sponge provided in Comparative Example 1. The test results are shown in Table 1.
[0067] Table 1
[0068] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Contact Angle (°) 150.3 150.0 150.5 150.1 0
[0069] As can be seen from Table 1, compared with Comparative Example 1, the superhydrophobic sponges provided in the embodiments of the present invention all have excellent hydrophobic properties (contact angle: 150.0° - 150.5°).
[0070] The unmodified melamine sponge provided in Comparative Example 1 of the present invention and the superhydrophobic sponge prepared in Example 2 were subjected to scanning electron microscope (SEM) tests, and the test results are respectively as Figure 2 (a) and Figure 2 (b) show that the unmodified melamine sponge exhibits three-dimensional hierarchical and smooth, porous structural characteristics; after being modified with covalent organic framework materials, the skeleton structure of the superhydrophobic sponge remains unchanged, retaining the original porous three-dimensional structure, and a rough structure covers the skeleton of the superhydrophobic sponge, increasing the hydrophobicity of the sponge.
[0071] The unmodified melamine sponge provided in Comparative Example 1 of the present invention and the superhydrophobic sponge prepared in Example 2 were subjected to hydrophobic performance tests. The test method is as follows: The unmodified melamine sponge and the superhydrophobic sponge were placed obliquely, and water droplets stained with methylene blue were dropped onto the sponges. By continuously dropping water droplets, the retention of the water droplets on the sponges was observed. The test result diagram of the hydrophobic performance of the unmodified melamine sponge provided in Comparative Example 1 is as Figure 3 (a) shows that the unmodified melamine sponge strongly absorbs water, and the water droplets are completely absorbed into the sponge; the test result diagram of the hydrophobic performance of the superhydrophobic sponge prepared in Example 2 is as Figure 3 (b) shows that the superhydrophobic sponge exhibits a significant waterproof effect. After the dyed water droplets are dropped on its surface, they quickly slide off, and the surface of the sponge is not stained, indicating that the superhydrophobic sponge has excellent waterproof performance.
[0072] Trichloromethane was selected to simulate heavy oil, and the superhydrophobic sponge prepared in Example 2 of the present invention was subjected to oil-water separation tests. The test method is as follows: Since trichloromethane is colorless, in order to facilitate differentiation from water, Sudan III, an oily dye, was used to stain trichloromethane, and then the stained trichloromethane was added to water. The red trichloromethane sank to the bottom, and the superhydrophobic sponge was adsorbed by external pressure. The test process and the test result diagram are as Figure 4 shown, and it can be seen that the red trichloromethane sank to the bottom, and the superhydrophobic sponge could completely adsorb the trichloromethane at the bottom.
[0073] n-Hexadecane was selected to simulate light oil, and the superhydrophobic sponge prepared in Example 2 of the present invention was subjected to oil-water separation tests. The test method is as follows: Since n-hexadecane is colorless, in order to facilitate differentiation from water, Sudan III, an oily dye, was used to stain n-hexadecane, and then the stained n-hexadecane was added to water. The red n-hexadecane floated on the top, and then the superhydrophobic sponge was used for adsorption. The test process and the test result diagram are asFigure 5 As shown, it can be seen that the red n-hexadecane floats on the top, and the superhydrophobic sponge can completely adsorb the n-hexadecane on the top.
[0074] The continuous oil-water separation ability of the superhydrophobic sponge provided in Example 2 of the present invention was tested. The test method is as follows: In a beaker, add n-hexadecane and water dyed red with Sudan III. Insert one end of a plastic pipe into the sponge material, place the sponge at the liquid level of the beaker, connect the other end of the pipe to a conical flask, and turn on the pump for testing. The test process and test results are shown in Figure 6 As shown, it can be seen that after the pump is turned on, the red n-hexadecane continuously separates from the oil-water mixture and is continuously transferred to the conical flask, indicating that the superhydrophobic sponge has excellent continuous oil-water separation ability.
[0075] The superhydrophobic sponge prepared in Example 2 was used to conduct adsorption tests on 6 samples of toluene, silicone oil, vacuum pump oil, edible soybean oil, machine oil, and n-hexane respectively. The test method is as follows: Record the weight of the clean superhydrophobic sponge as M 0 (g). Then, place it in oil or an organic solvent until adsorption saturation, reweigh the adsorbed material, and record its weight as M 1 (g). Finally, use the formula Q m / m =(M 1 -M 0 ) / M 0 to calculate the mass adsorption capacity (i.e., mass absorption capacity). Calculate the volume adsorption capacity (i.e., volume absorption capacity) through the formula Q V / V =Q m / m *(d s / d l ), where d s and d l are the bulk density of the absorbent and the density of the absorbed liquid respectively (the bulk density of the absorbent refers to the mass per unit volume, here it is the mass per unit volume of the superhydrophobic sponge, and the absorbed liquid is oil or an organic solvent). The cycle performance test was carried out by repeating the absorption-extrusion process. In each extrusion stage, the absorbent was compressed to extract the absorbed liquid. The test results are shown in Figure 7 As shown, it can be seen that except for toluene and n-hexane, the adsorption capacity of the superhydrophobic sponge for the other four samples exceeds 90 times its own weight. In particular, the adsorption amount of the superhydrophobic sponge for the silicone oil sample exceeds 115 times its own weight. From the volume adsorption capacity, it can be seen that the adsorption capacity of the superhydrophobic sponge for each oil sample is higher than 0.9 mL / cm 3 , indicating that the superhydrophobic sponge has good adsorption capacity for 6 oil samples. Referring to the same method, the superhydrophobic sponges prepared in Example 1, Example 3, and Example 4 were tested respectively. The test results are shown in Figures 8 - 10As shown, it can be seen that the superhydrophobic sponges prepared in Example 1, Example 3, and Example 4 also have good adsorption capacity for the above six oil samples.
[0076] In summary, the superhydrophobic sponges prepared by modifying the melamine sponge using the preparation method provided by the present invention all have superhydrophobic properties, and have excellent adsorption properties for different oils and toxic organic solvents, which has important scientific significance and practical application value for realizing oil-water separation.
[0077] The applicant declares that the present invention uses the above examples to illustrate the superhydrophobic sponge and its preparation method and application of the present invention, but the present invention is not limited to the above examples, that is, it does not mean that the present invention must rely on the above examples to be implemented. Those skilled in the art should understand that any improvement of the present invention, the equivalent substitution of the raw materials selected by the present invention, the addition of auxiliary components, the selection of specific methods, etc. all fall within the protection scope and the disclosure scope of the present invention.
Claims
1. A method for preparing a superhydrophobic sponge, characterized in that: The preparation method comprises the following steps: 2,5-bis(2-propyn-1-yloxy)-1,4-benzenedicarboxaldehyde and 1,3,5-tri(4-aminophenyl)benzene are mixed, and then an organic solvent is added, mixed again, and then an acetic acid aqueous solution is added to obtain a mixed solution, and then a melamine sponge is immersed in the mixed solution, allowed to stand, and post-treated to obtain the super hydrophobic sponge.
2. The preparation method according to claim 1, characterized in that: The mass ratio of the 2,5-bis(2-propyn-1-yloxy)-1,4-benzenedicarbaldehyde to 1,3,5-tris(4-aminophenyl)benzene is 1:(0.8-1.2).
3. The preparation method according to claim 1 or 2, characterized in that: The organic solvent includes dimethyl sulfoxide; Preferably, based on the usage of 7.5-30 mg of 2,5-bis(2-propyn-1-yloxy)-1,4-benzenedicarbaldehyde, the usage of the organic solvent is 2-20 mL.
4. The preparation method according to any one of claims 1 to 3, characterized in that The re-mixing method includes ultrasonic treatment.
5. The preparation method according to any one of claims 1 to 4, characterized in that: The concentration of the acetic acid aqueous solution is 0.5-8 mol / L; Preferably, based on the amount of 2,5-bis(2-propyn-1-yloxy)-1,4-benzenedicarbaldehyde being 7.5-30 mg, the amount of the acetic acid aqueous solution being 300-1200 μL; Preferably, the adding of the acetic acid aqueous solution is carried out under stirring conditions; Preferably, the stirring comprises magnetic stirring; Preferably, after adding the acetic acid aqueous solution, the method further comprises the step of continuing stirring for 1-30 minutes.
6. The preparation method according to any one of claims 1 to 5, characterized in that: Before immersing the melamine sponge in the mixed solution, the following pretreatment steps are also included: Cut, wash and dry the melamine sponge; Preferably, the volume of the melamine sponge after cutting is 1.0*1.0*1.0cm to 2.0*2.0*2.0cm.
7. The preparation method according to any one of claims 1 to 6, characterized in that: The standing temperature is 20-30°C; Preferably, the standing time is 2-48h; Preferably, the post-processing includes cleaning and drying.
8. A preparation method according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: (1) Cutting, cleaning and drying the melamine sponge; (2) 2,5-bis(2-propyn-1-yloxy)-1,4-benzenedicarboxaldehyde and 1,3,5-tri(4-aminophenyl)benzene are mixed, and then an organic solvent is added, and ultrasonic treatment is performed until the solution is uniformly dispersed, and then an acetic acid aqueous solution with a concentration of 0.5-8 mol / L is added under magnetic stirring conditions, and stirring is continued for 1-30 minutes after the addition is completed to obtain a mixed solution, and then a melamine sponge is immersed in the mixed solution, and allowed to stand at 20-30° C. for 2-48 hours, and the treated melamine sponge is taken out, washed, and dried to obtain the super hydrophobic sponge.
9. A super hydrophobic sponge, characterized in that: The super hydrophobic sponge is prepared by the preparation method according to any one of claims 1 to 8.
10. Use of the super-hydrophobic sponge as claimed in claim 9 in adsorbing oil stains.