Synthesis of hierarchically mesoporous carbon templated by mesoporous silica nanospheres

Abstract

Mesoporous materials are porous materials with the pore size of 2-50 nm. Mesoporous carbon material is a new type of non-silicon mesoporous material newly discovered in recent years. Mesoporous materials have a large specific surface area, rich mesostructure and good electrical and thermal conductivity, which makes it catalyzed, adsorbed, separated, and transported. Gas storage and other aspects have shown good application prospects. Recently, the preparation and research of hierarchically porous materials have been made into breakthroughs. However, hierarchically pore materials still exist in the preparation and there are still many unsolved problems in the research. For example, the complicated process, the high cost, and the pore structure is difficult to control. Therefore, it is still of great significance to seek a simple and easy-to-use synthesis method to prepare a hierarchically pore carbon material with uniform pore size and controllability. Hierarchically mesoporous carbon material is a carbon material synthesized by mesoporous silica as a template. Therefore, preparing a mesoporous silica nanospheres template with controlled size is a key step in the synthesis of hierarchically mesoporous carbon materials.

At present, the templating method has become a widely used way for preparing mesoporous carbon materials at this stage. In this paper, we first prepare three-dimensional ordered mesoporous silica nanospheres by self-assembly with a positive surfactant and tetraethyl orthosilicate as a hard template. Carbon precursors were then filled in the mesoporous and void of silica spheres to prepare mesoporous carbon materials. The preparation of monodisperse mesoporous beads of 15nm-50nm is realized by controlling the stirring rate; the carbon materials obtained by the template methods and have a high specific surface area and pore volume. Finally, it will be applied to adsorption experiments to explore small particle size silica. The adsorption properties of volatile organic compounds (VOCs) on carbon materials prepared by silica templates with different particle sizes were investigated.