Sodium alginate-MOF (metal organic framework) composite spherule as well as preparation method and application thereof
A metal-organic framework and sodium alginate technology, applied in the fields of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the problems of poor acid resistance, difficult separation and recovery, etc., to improve stability, Large specific surface area, effect of preventing dissolution
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[0046] Example 1
[0047] Add chromium nitrate nonahydrate and terephthalic acid (the mass ratio of chromium nitrate nonahydrate to terephthalic acid is 2.41:1) into a 0.3% hydrofluoric acid solution (the mass ratio of solid to solvent is 0.08: 1) After stirring uniformly, add it into the autoclave, heat the reactor to 220°C, react for 8 hours to obtain the crude product, after cooling, dissolve the obtained crude product in 200mL of absolute ethanol at 70°C Stir for 1.5 hours, then centrifuge at 10,000 rpm for 5 minutes, and the obtained solid was repeatedly washed with ethanol to obtain refined metal organic framework material MIL-101 (Cr).
[0048] Add the MIL-101(Cr) and sodium alginate (viscosity average molecular weight 100,000) obtained in the previous step into the water (the mass ratio of sodium alginate, metal organic framework compound, and water is 1:1:50). Stir until the mixture is uniform, and then ultrasonically shake to remove air bubbles to obtain a sodium alginat...
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[0053] Example 2
[0054] Add chromium nitrate nonahydrate and trimesic acid (the mass ratio of chromium nitrate nonahydrate to trimesic acid is 0.35:1) into a 4% hydrofluoric acid solution (the mass ratio of solid to solvent is 0.04: 1) After stirring uniformly, add to the autoclave, heat the reactor to 220°C, react for 96 hours to obtain the crude product, after cooling, dissolve the obtained crude product in 300mL of absolute ethanol at 60°C Stir for 1.0 hour, then centrifuge at 10,000 rpm for 5 min, and the obtained solid was repeatedly washed with ethanol to obtain refined metal organic framework material MIL-100 (Cr).
[0055] Add the MIL-100 (Cr) and sodium alginate (viscosity average molecular weight of 5,000) obtained in the previous step into the water (the mass ratio of sodium alginate, metal organic framework compound, and water is 1:0.5:50). Stir until the mixture is uniform, and then ultrasonically shake to remove air bubbles to obtain a sodium alginate / MIL-100 (Cr) ...
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[0060] Example 3
[0061] Add aluminum nitrate nonahydrate and trimellitic acid (the mass ratio of aluminum nitrate nonahydrate to trimesic acid is 2.21:1) into a 20% nitric acid solution (the mass ratio of solid to solvent is 0.10:1) After stirring, add it to the autoclave, heat the reactor to 210℃, react for 3 hours to obtain the crude product, after cooling, dissolve the obtained crude product in 100mL absolute ethanol, and stir at 80℃ for 2.0 After centrifugation at 10,000 rpm for 5 minutes, the obtained solid was repeatedly washed with ethanol to obtain refined metal organic framework material MIL-100 (Al).
[0062] Add the MIL-100 (Al) and sodium alginate (viscosity average molecular weight of 200,000) obtained in the previous step into the water (the mass ratio of sodium alginate, metal organic framework compound, and water is 1:0.25:50). Stir until the mixture is uniform, and then ultrasonically shake to remove bubbles to obtain a sodium alginate / MIL-100 (Al) mixed solutio...
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