▎ 摘　　要

CeO2 nanoparticles were decorated on graphene sponge and used for adsorption and photodegradation of methylene blue. They were characterized by X-ray diffraction (XRD), scanning electron microscopy, photoluminescence, Fourier transform infrared (FTIR) spectroscopy, and Raman spectroscopy. The results showed the charge transfer between CeO2 and surrounded graphene and the cationic methylene blue adsorption on negatively charged surface of graphene increase the photocatalytic activity of nanocomposite. Adsorption by both CeO2 nanoparticles and nanocomposite follows the Langmuir isotherm model and the kinetic was adapted by pseudo-second order. Scavenging of produced oxygenated radicals and adsorption of degradation products by graphene was confirmed by XRD and FTIR.