Mesoporous silica and preparation method thereof

Abstract

The invention provides mesoporous silica and a preparation method thereof. A sol-gel method is adopted, and the preparation method comprises the steps of adding a template agent into deionized water, then mixing with an ammonia water-water-ethanol solution, adding tetraethyl orthosilicate, stirring for fully reacting, aging, drying, and performing treatment by a muffle furnace to obtain mesoporous silica nanospheres. The method has the advantages of simple synthesis process, easiness in operation and low cost, and the prepared mesoporous silica nanospheres have the advantages of monodispersity, controllable morphology and high specific surface area of 1110.69m<2> / g.

Description

Technical field [0001] The invention relates to a method for preparing mesoporous materials, in particular to a method for preparing monodisperse mesoporous silica nanospheres with high specific surface area. Background technique [0002] In recent years, with the rapid development of nanomaterials and nanotechnology, more and more attention has been paid to the research and preparation of inorganic mesoporous materials. Mesoporous materials are a kind of large surface area with a pore diameter between micropores and macropores. And a new type of material with three-dimensional pore structure, which has excellent characteristics that other porous materials do not have. In particular, silica mesoporous materials, due to their high specific surface area, large pore volume, morphology and size, low controllable toxicity, and high biocompatibility, are used in the fields of catalysts, bioengineering, medicine, insulation materials, coatings, etc. Wide application prospects have beco...

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Problems solved by technology

China CN102583404A reports a method for preparing mesoporous silica, which is easy to operate and the prepared silica particles are in the nanoscale range, but the nano-morphology of silica is irregular, the particle size distribution is not uniform, and the monodispersity is not ideal

Chinese patent CN102992329A uses sodium dodecylbenzene sulfonate (SDBS) as a surfactant, and utilizes the three-dimensional guiding template effect during the polymerization of urea-formaldehyde resin to synthesize urea-formaldehyde resin-silicon oxide composite microspheres. After immersing in ethyl acetate alcohol solution, it was calcined at 600°C to obtain mesoporous silica microspheres, but the particle size was too large, between 2.0 and 7.2 μm, and the specific surface area was only 500m 2 / g or so

Chinese patent CN102295291A adopts mercapto-vinyl radical addition reaction to obtain organosiloxane-modified styrene-butadiene-styrene triblock copolymer, and then pass it with silicon source under acidic or alkaline conditions A kind of mesoporous silica is obtained by sol-gel method. This method requires grafting modification to prepare mesoporous templates. The synthesis process is relatively complicated and the preparation cycle is long.

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