Preparation method of MOF/polymer composite film and application thereof
A polymer and composite membrane technology, applied in the field of membrane separation, can solve the problems of poor stability, reduced membrane separation performance, poor compatibility, etc., and achieve high stability, good separation effect, and environmental friendliness.
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Embodiment 1
[0016] Embodiment 1 (i.e. comparative example)
[0017] Composite film preparation method:
[0018] (1) First, the polyacrylonitrile substrate is hydrolyzed. The steps are: cut the substrate into a disc with a diameter of 8 cm, then soak it in 30% ethanol aqueous solution for 2 hours, and rinse it with a large amount of deionized water several times after soaking , and put it into a suction filter bottle for vacuum suction for 4h. Then, it was immersed in 2mol / L sodium hydroxide aqueous solution for 20min, and the temperature was kept at 65°C. Finally, rinse with a large amount of deionized water until the surface of the substrate is neutral, and then put it in a room temperature oven for vacuum drying;
[0019] (2) Prepare a 0.075g / L polyethyleneimine aqueous solution, then take 0.5mL of the solution and mix it with 0.5mL deionized water, and then obtain a uniform and stable polyethyleneimine casting solution after fully shaking;
[0020] (3) The substrate obtained in step...
Embodiment 2
[0025] Composite film preparation method:
[0026] (1) First, the polyacrylonitrile substrate is hydrolyzed. The steps are: cut the substrate into a disc with a diameter of 8 cm, then soak it in 30% ethanol aqueous solution for 2 hours, and rinse it with a large amount of deionized water several times after soaking , and put it into a suction filter bottle for vacuum suction for 4h. Then, it was immersed in 2mol / L sodium hydroxide aqueous solution for 20min, and the temperature was kept at 65°C. Finally, rinse with a large amount of deionized water until the surface of the substrate is neutral, and then put it in a room temperature oven for vacuum drying;
[0027] (2) Prepare 0.075g / L polyethyleneimine and 0.025g / L BUT-8(A) (molecular formula Cr 3 (μ 3 -O)(H 2 O) 3 (NDC(SO 3 h 5 / 6 ) 2 ) 3 ) aqueous solution, then take 0.5mL respectively and mix them, and obtain a uniform and stable polyethyleneimine / BUT-8(A) casting solution after fully shaking;
[0028] (3) The subs...
Embodiment 3
[0033] Composite film preparation method:
[0034] (1) First, the polyacrylonitrile substrate is hydrolyzed. The steps are: cut the substrate into a disc with a diameter of 8 cm, then soak it in 30% ethanol aqueous solution for 2 hours, and rinse it with a large amount of deionized water several times after soaking , and put it into a suction filter bottle for vacuum suction for 4h. Immerse it in 2mol / L sodium hydroxide aqueous solution for 20min, and keep the temperature at 65°C. Finally, rinse with a large amount of deionized water until the surface of the substrate is neutral, and then put it in a room temperature oven for vacuum drying;
[0035] (2) Prepare 0.075g / L polyethyleneimine and 0.050g / L BUT-8(A) aqueous solutions respectively, then take 0.5mL respectively and mix them, and obtain uniform and stable polyethyleneimine / BUT after shaking well -8 (A) casting solution;
[0036] (3) The substrate obtained in step (1) is fixed on the spin coater, the rotating speed of...
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