Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, 518055, People's Republic of China.
Environ Sci Pollut Res Int. 2018 May;25(14):13813-13822. doi: 10.1007/s11356-018-1578-1. Epub 2018 Mar 6.
Adsorption is well accepted as an effective method for perfluorinated compounds' (PFCs) removal from water among various conventional methods. However, development of adsorbents that combine good performance of PFC removal and regenerability has not yet been realized. This work demonstrated the fabrication and application of an ammoniated magnetic adsorbent for efficient and economical PFOS and PFOA removal. Functional ammonium groups and γ-FeO were effectively incorporated in the particle with the proposed method. These fabricated magnetic particles presented superior adsorption performance for PFOS and PFOA with short equilibrium time of 120 min and high adsorption capacity. The isotherms revealed that the adsorption process belonged to multilayer sorption with their intricate interactions including anion exchange and hydrophobic interaction. The magnetic particle maintained its removal efficacy over a wide pH range of 3-9 or with coexisting substances. Moreover, the regeneration and reuse of the magnetic particle were successfully carried out with PFOS and PFOA removal efficiency sustained higher than 80% in 15 consecutive treatment cycles. Along with the efficient adsorption and easy separation of adsorbents, we expect that this ammoniated magnetic particle can serve as an excellent alternative for PFOS and PFOA removal from water.
吸附法被广泛认为是去除水中全氟化合物（PFCs）的有效方法之一，优于各种传统方法。然而，开发兼具良好的 PFC 去除性能和可再生性的吸附剂尚未实现。本工作展示了一种氨化磁性吸附剂的制备及其在高效、经济去除全氟辛烷磺酸（PFOS）和全氟辛酸（PFOA）中的应用。该方法可有效将功能化的铵基团和γ-FeO 引入颗粒中。所制备的磁性颗粒对 PFOS 和 PFOA 具有优异的吸附性能，平衡时间短至 120 分钟，吸附容量高。吸附等温线表明，吸附过程属于多层吸附，涉及阴离子交换和疏水相互作用等复杂相互作用。该磁性颗粒在 pH 值为 3-9 的较宽范围内或存在共存物质时仍能保持去除效果。此外，通过 15 次连续处理循环，成功实现了磁性颗粒的再生和再利用，PFOS 和 PFOA 的去除效率均保持在 80%以上。鉴于吸附剂具有高效的吸附性能和易于分离的特点，我们期望这种氨化磁性颗粒可以成为去除水中 PFOS 和 PFOA 的理想替代品。
