Preparation method of mesoporous silicon dioxide hollow sphere

Abstract

The invention provides a preparation method of a mesoporous silicon dioxide hollow sphere, relates to a silicon dioxide hollow sphere, and provides a preparation method of a mesoporous silicon dioxide hollow sphere. The method comprises the steps of: adding a silicon dioxide sphere into water, and ultrasonically processing to obtain silicon dioxide sphere dispersion solution; adding a cationic surface active agent into the obtained silicon dioxide sphere dispersion solution, adding an alkali source, and etching in a stirring way; and collecting, cleaning and drying a precipitate after etching to obtain white powder, and removing the cationic surface active agent out of the white powder to obtain the mesoporous silicon dioxide hollow sphere. The silicon dioxide sphere is taken as a template, and the mesoporous silicon dioxide hollow sphere is prepared by means of carrying out alkali etching under the effect of the cationic surface active agent. The preparation method has the advantages of being strong in operability, low in cost, simple in reaction device, mild in preparation processing condition, cleaning and pollution-free in reaction processe, and high in reaction efficiency and the like. Compared with other synthesis method, the preparation method is good in industrial application prospect.

Description

Technical field [0001] The invention relates to hollow silica spheres, in particular to a method for preparing hollow mesoporous silica spheres. Background technique [0002] Materials with a hollow structure have potential applications in many fields such as catalysis, low-density structural materials, drug carriers, chemical sensors, and electrode materials due to their unique properties such as lower density and higher surface area. Among the many hollow materials, mesoporous silica hollow spheres have high specific surface area, good mechanical and thermal stability, low toxicity, high biocompatibility, high drug loading capacity, and mesoporous channels that can be used as transport species. And other properties, it has important research value and application prospects in the field of restricted catalysis and drug delivery, and has received extensive attention from researchers. [0003] The existing preparation methods of mesoporous silica hollow spheres mainly include: [00...

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Problems solved by technology

[0006] There are inevitable defects in the above synthesis methods. For example, although the hard template method can be used to control the synthesis of templates to obtain mesoporous silica hollow spheres with uniform size and adjustable size, the post-treatment process of this method is often too cumbersome. and high energy consumption; in addition, the octadecyltrimethoxysilane used is expensive

On the other hand, although the use of soft template method can reduce the energy consumption of post-processing (such as using extraction technology), because the micelles used in soft template method usually lack effective control means, the mesoporous dioxide obtained by this method Silica hollow spheres are often not uniform in size; in addition, soft template methods usually require some expensive surfactants

Therefore, in practical applications, the existing hard template method and soft template method are not conducive to large-scale synthesis of industrialization due to the relatively cumbersome operation process and high cost, thus limiting their application.

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