Preparation of Cage Nanoporous Silica and Its Application in Chromatographic Fillers

In this paper, the cage nanoporous silica is composed of ethyl orthosilicate as silicon source, triblock copolymerpoly (ethylene oxide) -poly (propylene oxide) -polyethylene oxide (F127) as structure guide agent and additive, whilethe Fm3m cubic structure of cage type nanoporous silica was prepared by hydrothermal synthesis method. It is easyto control the self-assembly of the silica triblock copolymer intermediates thermally. In addition, the change in samplepore size and pore volume can be achieved by a hydrothermal reaction at a temperature of 100 ° C to 150 °C. Smallangle X-ray diff raction shows that these samples have ordered pores, while adsorption studies show that they havehigh porosity, uniform distribution of bimodal pores and large pore volume. Use separation of p-methylbenzene borate,iodobenzene and biphenyl by using three kinds of cage-type nanoporous silica materials as chromatographic fi llers. Theresults showed that the material prepared at 130 ℃ under hydrothermal condition had the best eff ect on the separationof three organic compounds.