Adsorption Properties of Ordered Mesoporous Silica for Butyraldehyde

Ordered mesoporous silica materials SBA-15, MCM-41, SBA-16, KIT-6 with different pore sizes and properties were prepared. Several SBA-15 materials were synthesized with different pore diameters by changing the hydrothermal temperature. The materials produced were characterized using small-angle X-ray scattering (SAXS), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and nitrogen adsorption/desorption. The adsorption isotherms of organic aldehyde were measured, using butyraldehyde as a model molecule. The results were compared with those for the adsorption capacity of Y-zeolite; they showed that the specific surface area originating from the mesopores was proportional to the amount of butyraldehyde adsorption. The adsorption isotherms agreed with Langmuir mode for monolayer adsorption. Mesoporous silica MCM-41 with the highest mesopore specific surface area showed the highest adsorbed amount of butyraldehyde (484 mg.g(-1)). The SBA-15 sample was selected for the fabrication of cigarette filters, and the results showed that SBA-15 significantly reduced the amount of Croton aldehyde released in cigarette smoke.