A method for preparing highly oriented MOF nanosheet films by self-transformation of layered metal hydroxides
A hydroxide, layered metal technology, applied in the field of MOF nanosheet membrane preparation, can solve problems such as preparation difficulties, and achieve the effect of excellent gas separation ability
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Embodiment 1
[0025] A method for preparing highly oriented cobalt-based MOF nano-sheet film by in-situ transformation of oriented cobalt metal hydroxide lamellae;
[0026] Step (1): Select an alumina porous ceramic tube or porous ceramic sheet with an average pore diameter of 200 nm as a carrier, ultrasonically clean it with deionized water and absolute ethanol for 30 minutes before use to remove impurities, and dry it in a 60°C vacuum oven for 3 hours .
[0027] Step (2): add 0.6225g tetrahydrate and cobalt acetate, 200mL deionized water, 175μL hydrazine hydrate (85%) and 5mL ammonia water to a 250mL round-bottomed flask, and heat under reflux at 95°C for 1.5h, until the synthesis solution drops to After room temperature, it was centrifuged and washed three times with deionized water to obtain Co(OH) 2 Nanosheets.
[0028] Step (3): Co(OH) 2 The nanosheets were dispersed in methanol solution to prepare Co(OH) with a mass fraction of 2% 2 Methanol solution, sonicated for 30min to make ...
Embodiment 2
[0031] A method for preparing highly oriented cobalt-based MOF nano-sheet film by in-situ transformation of oriented cobalt metal hydroxide lamellae;
[0032] Step (1) and step (2) are the same as in Example 1.
[0033] Step (3): Co(OH) 2 The nanosheets were dispersed in methanol solution to prepare Co(OH) with a mass fraction of 4% 2 Methanol solution, sonicated for 30min to make it evenly dispersed. Then the surface of the carrier coated in step (1) is pulled up, the number of times of pulling is 5 times, the time of single pulling is 20s, and after each pulling is completed, it is dried in an oven at 80°C for 1 h to obtain Co(OH) 2 The carrier of the nanosheet active layer.
[0034] Step (4): the Co(OH) obtained in step (3) 2 The carrier of the nanosheet active layer is vertically suspended in the MOF film layer synthesis solution, and the molar ratio of each composition solution is benzimidazole: ammonia water: toluene: methanol = 1: 1: 9: 24, in the stainless steel re...
Embodiment 3
[0036] A method for preparing highly oriented cobalt-based MOF nano-sheet film by in-situ transformation of oriented cobalt metal hydroxide lamellae;
[0037] Step (1) and step (2) are the same as in Example 1.
[0038] Step (3): Co(OH) 2 The nanosheets were dispersed in methanol solution to prepare Co(OH) with a mass fraction of 0.5% 2 Methanol solution, sonicated for 30min to make it evenly dispersed. Then the prepared Co(OH) 2 The methanol solution was introduced into the surface of the carrier, the volume of the spin coating solution was 2 mL, and the rotation speed was 2000 r / min. 2 The carrier of the nanosheet active layer.
[0039] Step (4): the Co(OH) obtained in step (3) 2 The carrier of the nanosheet active layer is vertically suspended in the MOF film layer synthesis solution, and the molar ratio of each composition solution is benzimidazole: ammonia water: toluene: methanol = 1:2:18:48, in the stainless steel reaction of polytetrafluoroethylene The reaction w...
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