A kind of polydopamine-ionic liquid composite membrane and preparation method thereof
A technology of polydopamine and ionic liquid, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve problems such as uneven coating, achieve increased uniform dispersion, excellent dye separation performance, and good hydrophilic anti-pollution performance Effect
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Embodiment 1
[0026] 1) Preparation of polydopamine ionic liquid blend solution: put dopamine hydrochloride and ionic liquid (1-hydroxyethyl-3-methylimidazolium tetrafluoroborate) into 10 mM Tris solution, and set the volume to 200 mL, to obtain a mixed solution, the initial concentration of dopamine hydrochloride relative to the mixed solution was 2 mg / L, the initial concentration of the ionic liquid relative to the mixed solution was 2 mg / L, and stirred at room temperature for 24 h to obtain a homogeneous polydopamine ionic liquid co- Mix the solution and set aside.
[0027] 2) Preparation of a polydopamine-ionic liquid composite membrane: a commercial polyvinylidene fluoride microfiltration membrane was immersed in a polydopamine ionic liquid blend solution, stirred at room temperature for 24 h, washed with water, and dried in a vacuum oven at 30°C to obtain Polydopamine-ionic liquid composite membrane.
[0028] The scanning electron microscope image of its surface is shown in figure 1...
Embodiment 2
[0031] 1) Preparation of polydopamine ionic liquid blend solution: put dopamine hydrochloride and ionic liquid (1-hexyl-3-methylimidazolium chloride salt) into 10 mM Tris solution, and set the volume to 200 mL to obtain a mixed solution , the initial concentration of dopamine hydrochloride relative to the mixed solution was 4 mg / L, the initial concentration of the ionic liquid relative to the mixed solution was 2 mg / L, and stirred at room temperature for 24 hours to obtain a uniform polydopamine ionic liquid blend solution, which was placed for use.
[0032] 2) Preparation of a polydopamine-ionic liquid composite membrane: a commercial polyvinylidene fluoride microfiltration membrane was immersed in a polydopamine ionic liquid blend solution, stirred at room temperature for 24 h, washed with water, and dried in a vacuum oven at 30°C to obtain Polydopamine-ionic liquid composite membrane.
[0033] The scanning electron microscope image of its surface is shown in figure 2 .
...
Embodiment 3
[0036] 1) Preparation of polydopamine ionic liquid blend solution: put dopamine hydrochloride and ionic liquid (1-hexyl-3-methylimidazolium chloride salt) into 10 mM Tris solution, and set the volume to 200 mL to obtain a mixed solution , the initial concentration of dopamine hydrochloride relative to the mixed solution was 6 mg / L, the initial concentration of the ionic liquid relative to the mixed solution was 2 mg / L, and stirred at room temperature for 24 h to obtain a uniform polydopamine ionic liquid blended solution, which was stored for later use. .
[0037] 2) Preparation of a polydopamine-ionic liquid composite membrane: a commercial polyvinylidene fluoride microfiltration membrane was immersed in a polydopamine ionic liquid blend solution, stirred at room temperature for 24 h, washed with water, and dried in a vacuum oven at 30°C to obtain Polydopamine-ionic liquid composite membrane.
[0038] The scanning electron microscope image of its surface is shown in image ...
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