Abstract
Graphite oxide (GO) was synthesized from natural graphite powder using Hummers' method. A large number of oxygen-containing functional groups (C–O and CO) on the surface of graphite oxide were obtained, as identified by Fourier-transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The GO material shows outstanding catalytic performance and stability in the selective oxidation of glutaraldehyde to glutaric acid with aqueous H2O2. The catalytic activity has a slight increase when the GO is treated with 50% aqueous H2O2 solution and decreases evidently when the GO is treated with KBH4, which could be attributed to the increase in the amount of C–O and CO moieties after oxidation treatment or the decrease in the amount after reduction treatment. The oxygen-containing functional groups on the graphite oxide surface may play an important role in the catalytic process.
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