▎ 摘　　要

Porous graphene oxide foams were prepared by unidirectional freeze-drying technology and used to investigate the reaction between graphene oxide (GO) and SO2. The structure and composition changes of the graphene oxide were monitored by X-ray photoelectron spectrometry (XPS), Raman, X-ray diffraction (XRD), Thermogravimetric analysis (TGA), and ultraviolet-visible spectroscopy (UV-vis), and the product of the reaction was analyzed by an EDTA titration. The results show that SO2 was oxidized to SO3 and the GO was reduced. GO not only acts as the oxidant in the reaction, but also as the catalyst to catalyze the reaction of SO2 and O-2 to form SO3. This catalytic action is more active in the aqueous GO suspensions than in the foams. The GO foams can adsorb SO2 and convert it to SO3 which then changes to SO42- on contact with water. This offers a new effective method of converting noisome SO2 gas to SO3 at room temperature.