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18 Sorption behaviors of perfluorooctanoate (PFOA) by activated carbon fiber (ACF) in 19 aqueous solution were investigated. The sorption of PFOA on ACF followed 20 pseudo-second-order kinetics and the sorption equilibrium reached at approximately 6 h. The 21 sorption of PFOA on ACF fitted the Freundlich model well. The sorption capacity of PFOA by 22 ACF decreased with the increasing pH, indicating that electrostatic attractive (pH < 7.4) and 23 repulsion (pH > 7.4) existed in the sorption process. Dissolved organic matter (DOM) inhibited 24 the sorption of PFOA on ACF and no obvious sorption was observed when the concentration of 25 DOM was increased to 500 mg L -1 . This was primarily because of the competitive sorption 26 between DOM and PFOA, and the blockage of ACF pore by DOM. The results indicated that 27 electrostatic interactions, hydrogen bonding interaction, and hydrophobic interaction were 28 responsible for the fast sorption, and the formation of hemi-micelles and micelles of PFOA 29 further promoted the sorption of PFOA on ACF.30

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