Preparation and Application of Mesoporous Silica Materials with Reversed MCM-41 Nano-structure
We have prepared the spherical mesoporous silica particles of about 500 micrometer, which have a reversed MCM-41 nano-structure, by the hydrolysis and condensation of hydrophobic tetrabutoxysilane(TBOS) in W/O microemulsions. The W/O microemulsions were formed in the hydrophobic TBOS phase, which extracted the cetylpyridinium chloride in aqueous phase with water molecules, and TBOS phase was mechanically dispersed in aqueous phase. The mesoporous silica particles could be used as adsorbent in a packed column.
In order to prepare the nano-filter separation membrane supported with porous glass filter and the spherical mesoporous silica dispersed ferrite nano-particles, we used the W/O microemulsions in TBOS phase in this study. The separation properties of this nano-filter membrane supported with porous glass filter were evaluated for the separation of some solutes, which are vitamin B12, rhodamine B and hemoglobin, by using the concentration difference or the pressure difference as a driving force. Next, the spherical mesoporous silica particles dispersed ferrite nano-particle were prepared in two-phase system, which are composed of the hydrophobic TBOS phase and the aqueous phase dispersed ferrite nano-particles and dissolved the cetylpyridinium chloride as a templating agent. The spherical mesoporous silica dispersed ferrite nano-particles could be separated by magnets after adsorbing some solutes from aqueous phase.