Different transport behaviors and mechanisms of perfluorooctanoate (PFOA) and perfluorooctane sulfonate (PFOS) in saturated porous media

•PFOS had lower mobility than PFOA due to their different molecular structure.•Multivalent cation could inhibit PFOA and PFOS migration in porous media.•Acidic pH condition unfavored for the mobility of PFOA and PFOS.•The effect of solution cation type on PFOA transport had priority over pH.•pH had more significant effect on the transport of PFOS than cation type.