Preparation method of large-particle-size porous high-specific-surface silicon dioxide microspheres

Abstract

The invention relates to a preparation method of a large-particle-size porous high-specific-surface silicon dioxide microspheres. The preparation method comprises the following steps of: taking industrialized macroporous large-particle-size resin as a template and organic silicon as a silicon source, 'filling' the silicon source into a porous resin channel under a vacuum condition, hydrolyzing thesilicon source under an alkaline condition, then carrying out calcination, and preparing large-particle-size high-specific-surface silicon dioxide microspheres by a method of replacing holes and walls. In the first step, silicon oxide is filled into pore channels of the template resin for one-step carbonization, and the framework of the template resin is carbonized to further bring pore channelssecond filling, thereby ensuring the framework strength of the product namely silicon dioxide microspheres and enrich the pore channels. The silicon dioxide microspheres prepared by the method have the advantages of high specific surface area, easy control of pore channels and particle sizes, good uniformity, simple preparation process, low cost, suitability for large-scale preparation and potential application value in the field of adsorption separation.

Description

technical field [0001] The invention belongs to the field of inorganic porous materials and relates to a method for preparing silicon dioxide microspheres with large particle diameter, porous and high specific surface area. Background technique [0002] Due to its high specific surface area, good stability and strong adsorption capacity, porous silica has a wide range of applications in the fields of catalysis, environment and biomedicine. Therefore, it is of great significance to develop a method for preparing porous silica with low cost, simple process and easy industrialization. [0003] At present, the preparation methods of porous silica mainly include surfactant template method, sol-gel method and spray drying method. The surfactant template method uses surfactant as a template, and utilizes the difference in the morphology of surfactant micelles at different concentrations to hydrolyze organosiloxane under alkaline conditions to obtain silica materials with different...

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Problems solved by technology

[0006] In order to avoid the deficiencies of the prior art, the present invention proposes a method for preparing silica microspheres with large particle size, porous and high specific surface area, which solves the existing problems in the preparation process of porous silica such as high cost, cumbersome process, poor structure Problems such as poor controllability and narrow particle size control range (mainly manifested in the difficulty of preparing large particle sizes above the micron level)

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