▎ 摘　　要

Graphene quantum dots (GQDs), a new type of carbon-based nanoparticles are widely used in scientific applications in the recent years. With the size less than 10 nm, and the strong hydrophilic characteristics GQDs exhibit high mobility in the environment, and can easily transmit to the groundwater environment. Hence, a good understanding of the transport behaviors of GQDs in porous media can provide guidance for assessment and prediction of its environmental risks. Saturated packed column experiments were conducted to investigate the effect of ionic strength (IS,1 and 100 mM), pH (4,7 and 9) and initial concentration (9 and 18 mg L-1) on the fate and transport of GQDs in saturated porous media. Advection-dispersion-reaction model with the second-order kinetics simulated the process well. The retention of GQDs was promoted with increased ionic strength in sand column, which could be explained with classic filtration and XDLVO theories. The increase of pH slightly reduced the GQDs deposition in saturated porous media, due to that there were no secondary minima in XDLVO calculation, and GQDs still showed high mobility. Higher input concentration slightly increased the GQDs retention due to the ripening process. The recovery rate of GQDs were more than 90 % in the environment with low salt content, exhibiting extremely high migration capacity.