期刊
RSC ADVANCES
卷 7, 期 2, 页码 927-938出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra25230c
关键词
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资金
- National Natural Science Foundation of China [21377041]
- Science and Technology Project of Guangdong Province [2013B021300022]
- State Key Laboratory of Subtropical Building Science Foundation [2013KB28]
Polyacrylonitrile fiber (PANF)-derived activated carbon fibers (PACFs) were successfully prepared using a one step carbonation-activation, and were used for the sorption of perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA). High specific surface areas (SSAs) of 1782 m(2) g(-1) and micro/mesoporous structures of the PACFs were obtained by optimizing the preparation conditions of the PANF-based pre-oxidized fibers (PANOFs)/KOH ratio of 1 : 2 and an activation temperature of 800 degrees C. The as-prepared PACFs exhibited flexibility and endless forms, and sorption capacities of 1.52 mmol g(-1) for PFOS and 0.73 mmol g(-1) for PFOA, much higher than the commercially available coal-based powder activated carbon (PAC) and granular activated carbon (GAC), which was also indicated by the site energy distributions. The sorption system followed a pseudo-second-order kinetic model and a Freundlich isotherm model. The intra-particle diffusion and Boy's film-diffusion models were also used to verify that intra-particle diffusion is the main rate-controlling step. It was assumed that the multilayer sorption most probably occurs through electrostatic attraction and hydrophobic interaction, and some micelles and hemi-micelles form on the ACF surfaces. The PACFs show good reusability over five sorption-desorption cycle studies.
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