Abstract
Perfluorooctanoic acid (PFOA), a representative of per/polyfluorinated alkyl substances, has become a persistent water pollutant of widespread concern due to its biological toxicity and refractory property. In this work, we design and synthesize two porous aromatic frameworks (PAF) of PAF-CF3 and PAF-C2F5 using fluorine-containing alkyl based monomers in tetrahedral geometry. Both PAFs exhibit nanosized pores (∼1.0nm) of high surface areas (over 800m2 g-1) and good fluorophilicity. Remarkable adsorption capacity (˃740mg g-1) and superior efficiency (˃24g mg-1 h-1) are achieved toward the removal of PFOA with 1μg L-1 concentration owing to unique C-F···F-C interactions. In particular, PAF-CF3 and PAF-C2F5 are able to reduce the PFOA concentration in water to 37.9ng L-1 and 43.3ng L-1, below EPA regulations (70ng L-1). The reusability and high efficiency give both PAFs a great potential for sewage treatment.
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