Hollow silicon dioxide microsphere with pores in graded distribution as well as preparation method and application thereof
A silica, gradient distribution technology, applied in the field of porous materials, to achieve the effect of optimizing performance, increasing adsorption speed, and increasing adsorption capacity
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Embodiment 1
[0022] Prepare hollow silica microspheres coated with two layers of silica shells. The molar ratio of raw materials required for each layer of silica shells is: ethanol: water: pore former: TEOS: NH 3 ·H 2 O=58:144:0.3:1:10. The preparation method is as follows:
[0023] 1. Disperse PS microspheres in EtOH and H 2 In the mixed solution of O, after stirring for 30 minutes, add CTAB, after stirring for another 30 minutes, add TEOS and NH 3 ·H 2 O, continue to stir and react for 1 hour, then the reaction ends, filter with suction, wash with water, and obtain PS / CTAB-SiO 2 Composite microspheres, that is, composite microspheres coated with a layer of silica shell;
[0024] 2. The above PS / CTAB-SiO 2 The composite microspheres were dispersed in EtOH and H according to the same ratio 2 In the mixed solution of O, after stirring for 30 minutes, add TTAB, after stirring for another 30 minutes, add TEOS and NH 3 ·H 2 O, continue to stir and react for 1 hour, then the reaction ...
Embodiment 2
[0028] Prepare hollow silica microspheres coated with three layers of silica shells. The molar ratio of raw materials required for each layer of silica shells is: ethanol: water: pore former: TEOS: NH 3 ·H 2 O=58:144:0.3:1:10. The preparation method is as follows:
[0029] 1. Disperse PS microspheres in EtOH and H 2 In the mixed solution of O, after stirring for 30 minutes, add CTAB, after stirring for another 30 minutes, add TEOS and NH 3 ·H 2 O, continue to stir and react for 1 hour, then the reaction ends, filter with suction, wash with water, and obtain PS / CTAB-SiO 2 Composite microspheres, that is, composite microspheres coated with a layer of silica shell;
[0030] 2. Follow the same method and ratio as step 1 in PS / CTAB-SiO 2 A layer of silica shell is coated on the composite microspheres. The difference is that the pore-forming agent used is TTAB, and finally PS / CTAB-SiO 2 / TTAB-SiO 2 Composite microspheres;
[0031] 3. Mix PS / CTAB-SiO with the same ratio as s...
Embodiment 3
[0035] Preparation of coated two-layer SiO 2 shell hollow SiO 2 The microspheres, method and proportioning are the same as in Example 1, except that the second layer uses DTAB as a pore-forming agent.
[0036] The resulting hollow SiO 2 The thickness of the microsphere shell is 91nm, and the specific surface area of the sample is 654m 2 / g, the pore volume is 0.3888ml / g, the outer pore diameter is 1.72nm, and the inner pore diameter is 2.19nm.
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