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With existence of Fe/AC in PS oxidation, 61.7% of PFOA had been decomposed to fluoride ions and intermediates of short-chain perfluorinated carboxylic acids (PFCAs) with a 41.9per cent defluorination performance at 25 °C after 10 h. Adsorption of PFOA onto Fe/AC are viewed as a pre-concentration action prior to subsequent oxidation of PFOA. Fe/AC not merely removes PFOA through adsorption, but also activates PS to make sulfate radical