Method for preparing ordered mesoporous hollow silica spheres
A technology of mesoporous silica and silica spheres is applied in the field of preparation of ordered mesoporous silica hollow spheres, which can solve the problems of large-scale synthesis, cumbersome operation process, limited application and other problems that are unfavorable to industrialization, and achieve good industrial Application prospect, simple reaction device, low cost effect
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Embodiment 1
[0024] 1) In a glass bottle, add 50 mg of silica spheres to 10 mL of water, and obtain a dispersion of silica spheres after ultrasonication for 10 minutes.
[0025] 2) Add the silica sphere dispersion prepared in step 1) to 60 mL of ethanol / water (1:1) mixed solution with a concentration of 1.25 mg / mL cetyltrimethylammonium bromide, and then add 0.275 mL Ammonia water, stirred for 30min, added 0.125mL tetraethyl orthosilicate, stirred at 25°C for 6h, and then centrifuged.
[0026] 3) Redisperse the white precipitate obtained by centrifugation in step 2) in 10 mL of water to obtain a precursor dispersion.
[0027] 4) In a glass bottle, add 212 mg of anhydrous sodium carbonate to the precursor dispersion obtained in step 3), then stir at 50° C. for 8 hours, and finally cool at room temperature.
[0028] 5) The white precipitate treated in step 4) was repeatedly washed twice with water and ethanol, and then dried naturally to obtain a white powder.
[0029] 6) The obtained whit...
Embodiment 2
[0032]1) In a glass bottle, add 50 mg of silica spheres to 10 mL of water, and obtain a dispersion of silica spheres after ultrasonication for 10 minutes.
[0033] 2) Add the silica sphere dispersion prepared in step 1) to 60 mL of ethanol / water (1:1) mixed solution with a concentration of 2.5 mg / mL cetyltrimethylammonium bromide, and then add 0.55 mL of ammonia water, stirred for 30 min, added 0.25 mL of ethyl orthosilicate, stirred at 25°C for 6 h, and then centrifuged.
[0034] 3) Redisperse the white precipitate obtained by centrifugation in step 2) in 10 mL of water to obtain a precursor dispersion.
[0035] 4) In a glass bottle, add 212 mg of anhydrous sodium carbonate to the precursor dispersion obtained in step 3), then stir at 80° C. for 1 h, and finally cool at room temperature.
[0036] 5) The white precipitate treated in step 4) was repeatedly washed twice with water and ethanol, and then dried naturally to obtain a white powder.
[0037] 6) The target product is...
Embodiment 3
[0039] 1) In a glass bottle, add 50 mg of silica spheres to 10 mL of water, and obtain a dispersion of silica spheres after ultrasonication for 20 minutes.
[0040] 2) Add the silica sphere dispersion prepared in step 1) to 60 mL of ethanol / water (2:1) mixed solution with a concentration of 1.25 mg / mL cetyltrimethylammonium bromide, and then add 0.275 mL of ammonia water, stirred for 30 min, added 0.125 mL of tetraethyl orthosilicate, stirred at 25°C for 6 h, and then centrifuged.
[0041] 3) Redisperse the white precipitate obtained by centrifugation in step 2) in 10 mL of water to obtain a precursor dispersion.
[0042] 4) In a glass bottle, add 212 mg of anhydrous sodium carbonate to the precursor dispersion obtained in step 3), then stir at a constant temperature of 45° C. for 12 h, and finally cool at room temperature.
[0043] 5) The white precipitate treated in step 4) was repeatedly washed once with water and ethanol, and then dried naturally to obtain a white powder....
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