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Preparation method of superhydrophobic sponge for absorbing organic solvent

A super-hydrophobic sponge, organic solvent technology, applied in separation methods, chemical instruments and methods, other chemical processes, etc., can solve the problems of high separation cost, difficult to reuse, low oil absorption, etc. Inexpensive, simple preparation conditions and mild effect

Active Publication Date: 2020-12-11
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, some adsorption materials such as activated carbon and resin have also been used for organic matter adsorption and recovery due to their large adsorption capacity, but these materials have some problems, such as low oil absorption selectivity (that is, oil absorption and water absorption), oil absorption Low, difficult to reuse, high cost of separation, etc.

Method used

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  • Preparation method of superhydrophobic sponge for absorbing organic solvent
  • Preparation method of superhydrophobic sponge for absorbing organic solvent
  • Preparation method of superhydrophobic sponge for absorbing organic solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: the preparation of superhydrophobic polyurethane sponge, the steps are as follows:

[0020] Step 1. Place 50 mg of silicon dioxide particles with a diameter of about 200 nm in 30 mL of 50 mM tris (Tris) buffer solution with a pH value of 7.8 (that is, the silicon dioxide particles and tris The mass ratio of methane is 1:3.6), ultrasonication for 20 minutes, and standing for 20 minutes. Weigh 24mL of the above solution, and add 3mL of 20mg mL to this solution successively -1 tannic acid solution and 3mL of 10mg mL -1 Silver nitrate solution (that is, the mass ratio of silicon dioxide 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, 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 polyuret...

Embodiment 2

[0023] Embodiment 2: the preparation of superhydrophobic polyurethane sponge, the steps are as follows:

[0024] The steps of this Example 2 are basically the same as those of Example 1, except that in Step 1, the quality of the silicon dioxide particles added is changed from 50 mg to 25 mg (that is, the silicon dioxide particles and trishydroxymethylaminomethane The mass ratio of silicon dioxide to tannic acid to silver nitrate is 2:6:3). Figure 4 It is the water contact angle (CA) photo of the superhydrophobic polyurethane sponge prepared in embodiment 2. After being modified with silica particles, the roughness of the polyurethane sponge surface is increased. When the concentration of silica increased, the water contact angle of the obtained superhydrophobic polyurethane sponge increased, and the water contact angle was 154.32o at this time.

Embodiment 3

[0025] Embodiment 3: the preparation of superhydrophobic polyurethane sponge, the steps are as follows:

[0026] The steps of this Example 3 are basically the same as those of Example 1, except that in Step 1, the quality of the silicon dioxide particles added is changed from 50 mg to 75 mg (that is, the silicon dioxide particles and trishydroxymethylaminomethane The mass ratio of silicon dioxide to tannic acid to silver nitrate is 2:2:1). Figure 5 The water contact angle (CA) photo of the superhydrophobic polyurethane sponge prepared for embodiment 3. When the concentration of silica increases, the degree of micro-nano structure on the surface of the polyurethane sponge increases, making its roughness increase, the water contact angle of the obtained superhydrophobic polyurethane sponge increases, and the water contact angle is 167.78o at this time.

[0027] In summary, through the above examples and comparative examples and their corresponding water contact angle diagrams,...

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Abstract

The invention discloses a preparation method of super-hydrophobic sponge for adsorbing an organic solvent. The preparation method comprises the steps: placing silica particles into a trihydroxymethylaminomethane buffer solution with the pH value of 7.8, and carrying out ultrasonic treatment and standing; then, sequentially adding a tannic acid solution and a silver nitrate solution into the solution; soaking polyurethane sponge into the mixed solution, carrying out stirring at room temperature for 2 h, taking out the polyurethane sponge, cleaning the polyurethane sponge several times by usingdeionized water, and then, cleaning the polyurethane sponge several times by using ethanol to obtain polyurethane sponge of which the surface has a micronano structure; and placing the treated polyurethane sponge into an ethanol solution having the volume concentration of 1:1000 and containing 1H,1H,2H,2H-perfluorododecanethiol, carrying out stirring at room temperature for 12 h, taking out the polyurethane sponge, cleaning the polyurethane sponge several times by using ethanol, and drying the polyurethane sponge to finally obtain super-hydrophobic polyurethane sponge of which the water contact angle is larger than or equal to 150 DEG. The preparation method is simple and convenient in preparation process and mild in conditions, and the regulation of hydrophobic property of the super-hydrophobic sponge can be realized by changing the concentration of a silica solution in a preparation process.

Description

technical field [0001] The invention belongs to the preparation technology of nanocomposite materials, and relates to a preparation method for superhydrophobic sponge for absorbing organic solvents. Background technique [0002] In recent years, frequent oil spill accidents at home and abroad have brought serious harm to the environment and ecosystem. It is an urgent problem to be solved to quickly eliminate and recover the organic chemicals leaked in the environment and avoid larger-scale environmental pollution. In recent years, some adsorption materials such as activated carbon and resin have also been used for organic matter adsorption and recovery due to their large adsorption capacity, but these materials have some problems, such as low oil absorption selectivity (that is, oil absorption and water absorption), oil absorption Low cost, difficult to reuse and high cost of separation. The superhydrophobic modified material can overcome the problem of high water absorptio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/40B01D17/022B01J20/26B01J20/30C08L75/04
CPCB01D17/0202B01J20/262C08J9/40C08J2375/04
Inventor 石家福田雨姜忠义李蔚然
Owner TIANJIN UNIV
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