Preparation method of super-hydrophobic sponge for adsorbing organic solvent
A super-hydrophobic sponge and organic solvent technology, applied in separation methods, chemical instruments and methods, liquid separation, etc., can solve the problems of difficult re-use, high separation cost, low oil absorption, etc., and achieve simple and mild preparation conditions and the preparation of raw materials Inexpensive, the effect of regulating hydrophobic properties
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[0019] Example 1: Preparation of superhydrophobic polyurethane sponge, the steps are as follows:
[0020] Step 1. Place 50 mg of silica particles with a diameter of about 200 nm in 30 mL of 50 mM Tris buffer solution with a pH of 7.8 (that is, the silica particles and the tris The mass ratio of methane is 1:3.6), ultrasonic for 20 minutes, and let stand for 20 minutes. Weigh 24mL of the above solution and add 3mL20mg mL to this solution in turn -1 Tannic acid solution and 3mL 10mg mL -1 Silver nitrate solution (that is, the mass ratio of silica to tannic acid to silver nitrate is 4:6:3), soak 4 polyurethane sponges (1*1*1cm) in the solution, stir at room temperature for 2 hours, and take out the polyurethane The sponge was washed 3 times with deionized water, and then washed 3 times with ethanol, and dried to obtain a polyurethane sponge with a micro-nano structure on the surface.
[0021] Step 2. Put the four polyurethane sponges treated in the above step 1 into 30mL ethanol solu...
Example Embodiment
[0023] Example 2: Preparation of superhydrophobic polyurethane sponge, the steps are as follows:
[0024] The steps of this embodiment 2 are basically the same as those of embodiment 1, except that: in step 1, the mass of the added silica particles is changed from 50mg to 25mg (that is, the silica particles and tris The mass ratio of silicon dioxide is 1:7.2, and the mass ratio of silicon dioxide to tannic acid to silver nitrate is 2:6:3). Figure 4 This is the water contact angle (CA) photograph of the superhydrophobic polyurethane sponge prepared in Example 2. After being modified by silica particles, the surface roughness of the polyurethane sponge is increased. When the silica concentration increases, the water contact angle of the obtained superhydrophobic polyurethane sponge increases, and the water contact angle is 154.32o.
Example Embodiment
[0025] Example 3: Preparation of superhydrophobic polyurethane sponge, the steps are as follows:
[0026] The steps in this example 3 are basically the same as those in example 1, except that: in step 1, the mass of the added silica particles is changed from 50 mg to 75 mg (that is, the silica particles and tris The mass ratio of silicon dioxide is 1:2.4, and the mass ratio of silicon dioxide to tannic acid to silver nitrate is 2:2:1). Figure 5 This is the water contact angle (CA) photograph of the superhydrophobic polyurethane sponge prepared in Example 3. When the concentration of silica increases continuously, the degree of micro-nano structure built on the surface of the polyurethane sponge increases, so that the roughness increases, the water contact angle of the obtained superhydrophobic polyurethane sponge increases, and the water contact angle is 167.78o.
[0027] In summary, through the above examples and comparative examples and their corresponding water contact angle d...
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