Sorption of perfluorooctane sulfonate to carbon nanotubes in aquatic sediments

► Sorption of PFOS to MWCNT in the presence of sediment is dependent on pH and Ca2+ concentration. ► MWCNTs may dominate PFOS sorption in sediment at low PFOS concentration. ► PFOS Log KD values ranged 0.52-1.62 L kg−1 for sediment and 1.91-2.90 L kg−1 for MWCNT present in the sediment.