State Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control, School of Environment, Tsinghua University , Beijing 100084, China.
Stockbridge School of Agriculture, University of Massachusetts , Amherst, Massachusetts 01003, United States.
Environ Sci Technol. 2017 Jul 18;51(14):8027-8035. doi: 10.1021/acs.est.6b06540. Epub 2017 Jun 28.
A novel magnetic fluorinated adsorbent with selective and fast adsorption of perfluorooctanesulfonate (PFOS) was synthesized via a simple ball milling of FeO and vermiculite loaded with a cationic fluorinated surfactant. The loaded FeO nanoparticles increased the dispersibility of fluorinated vermiculite (F-VT) in water and allowed the magnetic separability. The nanosized FeO was homogeneously embedded into the adsorbent surfaces, improving the hydrophilicity of F-VT external surface, and this hybrid adsorbent still kept the hydrophobic fluorinated interlayer structure. With this unique property, FeO-loaded F-VT has very fast and selective adsorption for PFOS in the presence of other compounds, due to the fluorophilicity of C-F chains intercalated in the adsorbent interlayers. This novel adsorbent has a high sorption capacity for PFOS, exhibiting PFOS removal from fire-fighting foam wastewater that is much higher than that of powdered activated carbon and resin due to its high selectivity for PFOS. The used FeO-loaded F-VT was successfully regenerated by methanol and reused five times without reduction in PFOS removal and magnetic performance. The FeO-loaded F-VT demonstrates promising application for PFOS removal from real wastewater.
一种新型磁性氟化吸附剂，通过简单的球磨法将负载阳离子氟化表面活性剂的 FeO 和蛭石合成，对全氟辛烷磺酸（PFOS）具有选择性和快速吸附作用。负载的 FeO 纳米颗粒增加了氟化蛭石（F-VT）在水中的分散性并允许磁性分离。纳米 FeO 均匀嵌入到吸附剂表面，提高了 F-VT 外表面的亲水性，这种混合吸附剂仍然保持着疏水氟化层状结构。由于吸附剂层间插入的 C-F 链的氟亲性，这种独特的性质使负载 FeO 的 F-VT 在存在其他化合物的情况下对 PFOS 具有非常快速和选择性的吸附作用。这种新型吸附剂对 PFOS 具有高吸附容量，由于其对 PFOS 的高选择性，从消防泡沫废水中去除 PFOS 的效果远高于粉状活性炭和树脂。用过的负载 FeO 的 F-VT 可以通过甲醇成功再生，并重复使用五次，而不会降低 PFOS 的去除率和磁性性能。负载 FeO 的 F-VT 为从实际废水中去除 PFOS 展示了很有前景的应用。
