Method for preparing high-orientation MOF nanosheet type film through self-conversion of layered metal hydroxide
A technology of hydroxide and layered metal, which is applied in the field of preparation of MOF nanosheet membranes, can solve the problems of preparation difficulties
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Embodiment 1
[0025] A method for preparing a highly oriented cobalt-based MOF nanosheet film by in-situ conversion of oriented cobalt metal hydroxide sheets;
[0026] Step (1): Use an alumina porous ceramic tube or porous ceramic sheet with an average pore size of 200 nm as the carrier, ultrasonically clean it with deionized water and absolute ethanol for 30 min to remove impurities, and dry it in a vacuum oven at 60 °C for 3 h before use .
[0027] Step (2): Add 0.6225g of tetrahydrate and cobalt acetate, 200mL of deionized water, 175μL of hydrazine hydrate (85%) and 5mL of ammonia water into a 250mL round bottom flask, and heat at reflux at 95°C for 1.5h. After room temperature, it was centrifuged and washed 3 times with deionized water to obtain Co(OH) 2 Nanosheets.
[0028] Step (3): Co(OH) 2 The nanosheets are dispersed in methanol solution to form Co(OH) with a mass fraction of 2%. 2 Methanol solution, ultrasonic 30min to make it evenly dispersed. Then pull the surface of the ca...
Embodiment 2
[0031] A method for preparing a highly oriented cobalt-based MOF nanosheet film by in-situ conversion of oriented cobalt metal hydroxide sheets;
[0032] Step (1) and step (2) are the same as embodiment 1.
[0033] Step (3): Co(OH) 2 The nanosheets are dispersed in methanol solution to form Co(OH) with a mass fraction of 4%. 2 Methanol solution, ultrasonic 30min to make it evenly dispersed. Then pull the surface of the carrier coated in step (1), the number of pulls is 5 times, and the single pull time is 20s. After each pull, it is dried in an oven at 80°C for 1h to obtain a 2 The carrier of the nanosheet active layer.
[0034] Step (4): with Co(OH) obtained in step (3) 2 The carrier of the nanosheet active layer is suspended vertically in the synthesis solution of the MOF film layer. The molar ratio of each composition of the synthesis solution is benzimidazole: ammonia water: toluene: methanol = 1:1:9:24, reacted in the stainless steel of polytetrafluoroethylene React ...
Embodiment 3
[0036] A method for preparing a highly oriented cobalt-based MOF nanosheet film by in-situ conversion of oriented cobalt metal hydroxide sheets;
[0037] Step (1) and step (2) are the same as embodiment 1.
[0038] Step (3): Co(OH) 2 The nanosheets are dispersed in methanol solution to form Co(OH) with a mass fraction of 0.5% 2 Methanol solution, ultrasonic 30min to make it evenly dispersed. Then the prepared Co(OH) 2 The methanol solution was introduced onto the surface of the carrier, the volume of the spin-coating solution was 2mL, and the rotation speed was 2000r / min. After the spin-coating, the carrier was dried in an oven at 80°C for 1h to obtain a Co(OH) 2 The carrier of the nanosheet active layer.
[0039] Step (4): with Co(OH) obtained in step (3) 2 The carrier of the nanosheet active layer is suspended vertically in the synthesis solution of the MOF film layer. The molar ratio of each composition of the synthesis solution is benzimidazole: ammonia water: toluene...
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