Mesoporous silicas prepared by ammonium perchlorate oxidation and theirs application in the selective adsorption of high explosives

摘要

The ammonium perchlorate (AP) oxidation strategy is used to treat as-made mesoporous silicas, resulting "pure" mesoporous silicas without obvious framework shrinkage or composites (polymer/silica or carbon/silica). The study is focused on the effect of assistant acids. This method can be applied to prepare template-free mesoporous silicas, such as those with space groups of p6mm (SBA-15), Fm3m, Jm3m, and Ia3d. Structural characterizations are systematically provided by X-ray diffraction, transmission electron microscopy, N2 adsorption, element analysis, and Fourier transform infrared spectroscopy. The AP-HNO3 treated SBA-15 (N-SBA-15) shows high selectivity and adsorption capacity to HMX (4.7 μmol/g), and can be used as a preconcentrating material for its separation and detection.