Thin film composite film taking metal organic framework as functional layer, preparation method thereof and preparation method of metal organic framework
A metal-organic framework and composite membrane technology, applied in the field of filtration membranes, can solve problems such as difficulty in preparing large areas, inability to solve repeatability, cumbersome steps, etc., and achieve the effects of low cost, solving uneven distribution, and good repeatability
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Embodiment 1
[0085] Preparation of ZIF-L thin film composite membrane:
[0086] 1) 2-methylimidazole (0.692g, 8.4mmol) was dissolved in 10ml of polyethyleneimine (PEI) aqueous solution with a mass fraction of 5%, zinc nitrate hexahydrate (1.188g, 4.1mmol) was dissolved in 6ml of After mixing the two solutions in deionized water, the solution turned milky white, stirred at room temperature for 10 minutes, then added 35ml of absolute ethanol, and stirred for another 2 hours.
[0087] 2) Use a sprayer to spray the obtained solution on the polyacrylonitrile substrate with an area of 4.5cm*4.5cm, 10 times. The conditions for spraying are: the heating temperature of the heating plate where the substrate is located is 60°C, the flow rate is 0.2ml / min, and the needle is away from the substrate. 5cm, ambient temperature room temperature. Obtain a film (named ZIF-L film) with a layer of ZIF-L with uniform thickness on the surface, from figure 1 It can be found from the scanning electron microsco...
Embodiment 2
[0097] Similar to the method of Example 1, the metal organic framework used is UIO-66-NH 2 .
[0098] 1) 25mg of UIO-66-NH 2 After being added to 5 ml of 1% diethylenetriamine aqueous solution by mass fraction to obtain a mixed liquid, 30 ml of methanol was added to obtain a dispersion liquid.
[0099] 2) Use a sprayer to spray the obtained dispersion on the polyacrylonitrile substrate with an area of 4.5cm*4.5cm and spray it 25 times. The conditions used for spraying are: the heating temperature of the heating plate where the substrate is located is 50°C, and the flow rate is 0.2ml / min , the needle is 6cm away from the substrate, and the ambient temperature is room temperature. Get a surface with a layer of UIO-66-NH 2 The film (named UIO-66-NH 2 film), from Figure 10 The SEM image can be found that UIO-66-NH 2 There are a lot of particles on the surface of the membrane, which is granular UIO-66-NH 2 .
[0100] 3) Add UIO-66-NH 2 The membrane is glued to the recei...
Embodiment 3
[0103] Similar to the method of Example 1, the metal organic framework used is MIL-101-NH 2
[0104] 1) 45mg of MIL-101-NH 2 After being added to 5 ml of 1% triethylenetetramine solution by mass fraction to obtain a mixed solution, 40 ml of ethanol was added to obtain a dispersion.
[0105] 2) Use a sprayer to spray the obtained dispersion on the polyacrylonitrile substrate with an area of 4.5cm*4.5cm 30 times. The conditions used for spraying are: the heating temperature of the heating plate where the substrate is located is 70°C, and the flow rate is 0.15ml / min. The needle is 4 cm away from the substrate, and the ambient temperature is room temperature. Get a sheet with a layer of MIL-101-NH on the surface 2 The film (named MIL-101-NH 2 film), from Figure 13 The SEM image can be found that MIL-101-NH 2 There are a lot of particles on the surface of the membrane, which is granular MIL-101-NH 2 .
[0106] 3) MIL-101-NH 2 The membrane is glued to the receiver roller...
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