A method for preparing two-dimensional ultrathin MOF nanosheets from a three-dimensional MOF precursor
A nanosheet and MOF technology, which is applied in the field of preparing two-dimensional ultra-thin MOF nanosheets, can solve the problems of low yield, inability to obtain a specific functional surface, uneven thickness, etc.
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Embodiment 1
[0028] First, 0.308g of cadmium nitrate tetrahydrate (Cd(NO 3 ) 2 4H 2 O), 0.078g imidazole-4,5-dicarboxylic acid (H 3 IDC), 0.156g 4,4-bipyridine (bpy), 1.0mL pyridine (py,) and 10mL water (H 2 O) mixed and reacted for 7 days at 170°C in the reactor to obtain layered columnar MOF crystals ([Cd 5 (IDC) 2 (HIDC)(bpy) 3 (py) 2 (H 2 O) 3 ]·2NO 3 2H 2 0), and grind into powder after drying at 50°C in a vacuum oven for 24 hours, get 0.128g and place it in a stoppered glass bottle containing 40mL 4-picoline; secondly, place the stoppered glass bottle containing the mixed solution in On a magnetic stirrer, stir at room temperature for 10 days to obtain a well-dispersed suspension (concentration of about 3.2 mg / mL); finally, filter the suspension, place the filter cake in a petri dish, and dry it naturally at room temperature for 3 hours. And further dried in a vacuum oven at 50°C for 8 hours to obtain two-dimensional ultrathin MOF nanosheets.
[0029] The resulting layer-...
Embodiment 2
[0038] First, 0.308g of cadmium nitrate tetrahydrate (Cd(NO 3 ) 2 4H 2 O), 0.078g imidazole-4,5-dicarboxylic acid (H 3 IDC), 0.156g 4,4-bipyridine (bpy), 1.0mL pyridine (py,) and 10mL water (H 2 O) mixed and reacted for 7 days at 170°C in the reactor to obtain layered columnar MOF crystals ({[Cd 5 (IDC) 2 (HIDC)(bpy) 3 (py) 2 (H 2 O) 3 ]·2NO 3 2H 2 O} n ), and dried in a vacuum oven at 50°C for 24 hours, then ground into powder, and 0.128 g was placed in a stoppered glass bottle containing 40 mL of 2,6-lutidine; secondly, the stoppered glass bottle containing the mixture Place on a magnetic stirrer and stir at room temperature for 12 days to obtain a well-dispersed suspension (concentration about 3.2 mg / mL); finally, filter the suspension, place the filter cake in a petri dish, and dry naturally at room temperature for 4 hours, and further dried in a vacuum oven at 70°C for 10 hours to obtain two-dimensional ultrathin MOF nanosheets.
[0039] Irradiating the suspe...
Embodiment 3
[0041] First, 0.308g of cadmium nitrate tetrahydrate (Cd(NO 3 ) 2 4H 2 O), 0.078g imidazole-4,5-dicarboxylic acid (H 3 IDC), 0.156g 4,4-bipyridine (bpy), 1.0mL pyridine (py,) and 10mL water (H 2 O) mixed and reacted for 7 days at 170°C in the reactor to obtain layered columnar MOF crystals ({[Cd 5 (IDC) 2 (HIDC)(bpy) 3 (py) 2 (H 2 O) 3 ]·2NO 3 2H 2 O} n ), and dried in a vacuum oven at 50°C for 24 hours, then ground into powder, and 0.128 g was placed in 40 mL of 4-methylpyridine, 2,6-lutidine, 3,5-lutidine and 2, 4,6-collidine mixture in a stoppered glass bottle; secondly, place the stoppered glass bottle containing the mixed solution on a magnetic stirrer, and stir at room temperature for 15 days to obtain a suspension with good dispersion ( Concentration of about 3.2mg / mL); finally, filter the suspension, put the filter cake in a petri dish, dry naturally at room temperature for 5 hours, and further dry in a vacuum oven at 80°C for 12 hours to obtain a two-dimen...
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