▎ 摘　　要

Water-soluble graphene quantum dots (GQDs) were prepared by a simple one-pot H2O2-assisted hydrothermal carbonization method, in which waste sewage sludge was used as the carbon precursor. Fluorescence spectra of the as-generated GQDs showed tunable emission wavelengths with a quantum yield of 10.3%. Fourier transform infrared spectroscopy analysis revealed the presence of abundant hydroxyl groups on the surface of the GQDs. A possible formation mechanism of the GQDs derived from sewage sludge under H2O2-assisted hydrothermal conditions is also proposed on the basis of the experimental results. The hydroxyl radical oxidation generated from the decomposition of H2O2 and the hydrothermal carbonization process are believed to play a key role in the formation of GQDs. The as-prepared GQDs were employed as safe fluorescent additives to fabricate fluorescent hybrids, such as thin films, fibers, and inks.