A Comparative Study for Removal of Perfluorooctanoic Acid Using Three Kinds of N-polymer FunctionalizedCalotropis GiganteaFiber

Using NaClO2 pretreated Calotropis gigantea fiber (CGF) as the bio-template, three N-polymer functionalized fibers were fabricated by in-situ growth of polydopamine (PDA), polyaniline (PAN) and poly(m-phenylenediamine) (PmPD) along the fiber. The resulting adsorbents were applied to remove perfluorooctanoic acid (PFOA) from water. The adsorption process reached equilibrium within 3 h, and the maximum adsorption capacity was 207.3-232.8 mg/g. Electrostatic attraction, hydrogen bond and hydrophobic interaction participated in the adsorption process. Three adsorbents could be well regenerated, and the recovered adsorbents maintained higher adsorption percentage (>= 80%) after five adsorption-desorption cycles. Among three adsorbents, PAN-CGF displayed remarkable adsorption performance on perfluorochemicals removal.

Automated summary

In this study, three functionalized fiber adsorbents were fabricated using Calotropis gigantea fiber as the bio-template. These adsorbents showed high adsorption capacity for perfluorooctanoic acid (PFOA) removal from water. The adsorption process reached equilibrium within 3 hours, and the maximum adsorption capacity was 207.3-232.8 mg/g. Electrostatic attraction, hydrogen bond, and hydrophobic interaction were involved in the adsorption process. The adsorbents could be well regenerated and maintained high adsorption percentage (>= 80%) after multiple adsorption-desorption cycles. Among the three adsorbents, PAN-CGF exhibited outstanding adsorption performance for perfluorochemicals removal.