Mussel bionic auxiliary polyelectrolyte layer-by-layer self-assembled nanofiltration membrane and application thereof
A layer-by-layer self-assembly, polyelectrolyte technology, applied in the field of separation membranes, can solve the problems of acid and alkali resistance, insufficient stability of nanofiltration membranes, and achieve high salt rejection rate, improved chemical stability, and high chemical stability. Effect
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Embodiment 1
[0040] A mussel biomimetic assisted polyelectrolyte layer-by-layer self-assembled nanofiltration membrane, the preparation process of which specifically includes the following steps:
[0041] (1) The polyethersulfone ultrafiltration membrane was wetted with 50% ethanol for 5 minutes, and then rinsed with deionized water for 3 times, each time for 5 minutes;
[0042] (2) Prepare a Tris buffer solution with a pH of 8.5, and add CuSO 4 with H 2 o 2 ; Dopamine and polyethyleneimine are successively dissolved in Tris buffer solution, and the preparation concentration of dopamine and polyethyleneimine is 2g / L;
[0043] (3) Sodium polystyrene sulfonate is dissolved in water and sodium chloride is added, and the pH of the mixed solution is adjusted to 2 after stirring evenly. Wherein, the concentration of sodium polystyrene sulfonate is 1.03g / L, and the concentration of sodium chloride is 0.5mol / L;
[0044] (4) Fix the base film after the wetting treatment in a reaction device tha...
Embodiment 2
[0048] The preparation process of the nanofiltration membrane described in this embodiment is the same as that of Example 1, except that polydopamine / polyethyleneimine and sodium polystyrene sulfonate are alternately repeated, that is, in the present embodiment, step (4) and (5) were repeated twice, and then step (4) was repeated once; finally, the obtained membrane was soaked with 0.1% glutaraldehyde for 10 min.
Embodiment 3
[0050] The preparation process of the nanofiltration membrane described in this embodiment is the same as that of Example 1, except that polydopamine / polyethyleneimine and sodium polystyrene sulfonate are alternately repeated, that is, in the present embodiment, step (4) and (5) were repeated three times, and finally, the obtained membrane was soaked with 0.1% glutaraldehyde for 10 min.
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