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首页> 外文期刊>RSC Advances >Sorption of perfluorooctane sulfonate and perfluorooctanoate on polyacrylonitrile fiber-derived activated carbon fibers: in comparison with activated carbon
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Sorption of perfluorooctane sulfonate and perfluorooctanoate on polyacrylonitrile fiber-derived activated carbon fibers: in comparison with activated carbon

机译：全氟辛烷磺酸和全氟辛酸酯在聚丙烯腈纤维衍生的活性炭纤维上的吸附：与活性炭相比

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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 m2 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 °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.
机译：聚丙烯腈纤维（PANF）衍生的活性炭纤维（PACFs）使用一步碳酸化活化法成功制备，并用于吸附全氟辛烷磺酸盐（PFOS）和全氟辛酸酯（PFOA）。 PACF的1782 m 2 g ？1 的高比表面积（SSA）和微/中孔结构通过优化基于PANF的预氧化纤维（PANOFs）/ KOH比为1？：？2和活化温度为800°C的制备条件可以得到S.所制备的PACFs具有柔韧性和无端形式，对PFOS的吸附容量为1.52 mmol g ？1 和0.73 mmol g ？1 值远高于市售的煤基粉末活性炭（PAC）和颗粒状活性炭（GAC），这也由现场能量分布表明。吸附系统遵循伪二级动力学模型和Freundlich等温模型。粒子内扩散和Boy的薄膜扩散模型也用于验证粒子内扩散是主要的速率控制步骤。假定多层吸附最有可能通过静电吸引和疏水相互作用而发生，并且一些胶束和半胶束在ACF表面上形成。 PACF在五个吸附-解吸循环研究中显示出良好的可重用性。

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