School of Chemistry, Monash University, Clayton, Victoria 3800, Australia.
Department of Chemistry, Karbala University, Karbala 56001, Iraq.
Environ Sci Technol. 2020 Mar 17;54(6):3549-3558. doi: 10.1021/acs.est.9b05469. Epub 2020 Mar 3.
Fluorinated hydrocarbon (FHC) contamination has attracted global attention recently because of persistence within the environment and ecosystems of many types of FHC. The surfactant perfluorooctanoic acid (PFOA) is particularly commonly found in contaminated sites, and thus, urgent action is needed for its removal from the environment. In this study, water dispersible hybrid capsules were successfully prepared from an oil-in-water emulsion stabilized by graphene oxide and including a silicate precursor to grow a strong, mesoporous capsule shell surrounding the droplets. These capsules were decorated with amine groups to present a positively charged outer corona that attracts negative PFOA molecules. The aminated capsules were effectively applied as a novel technology to adsorb and sequester PFOA contamination in water. It was confirmed that PFOA removal by the capsules was pH and PFOA concentration dependent, with adsorption efficiencies of >60 mg g under ideal conditions. PFOA removal kinetics followed using high-performance liquid chromatography and liquid chromatography-mass spectrometry showed that capture of PFOA by the capsules reached a maximum of >99.9% in 2-3 days.
氟碳化合物 (FHC) 污染因其在环境和生态系统中的持久性而引起了全球关注，许多类型的 FHC 都存在这种污染。表面活性剂全氟辛酸 (PFOA) 特别常见于污染场所，因此需要采取紧急行动将其从环境中去除。在这项研究中，成功地制备了一种由氧化石墨烯稳定的油包水乳液制成的水分散性杂化胶囊，其中包括硅酸前体，以在液滴周围生长出坚固的、具有中孔的胶囊壳。这些胶囊用胺基进行了修饰，呈现出带正电荷的外部电晕，吸引带负电荷的 PFOA 分子。经过胺化的胶囊被有效地用作一种新型技术，用于吸附和隔离水中的 PFOA 污染。实验证实，胶囊对 PFOA 的去除依赖于 pH 值和 PFOA 浓度，在理想条件下的吸附效率>60mg g。使用高效液相色谱法和液质联用技术对 PFOA 的去除动力学进行了研究，结果表明，在 2-3 天内，胶囊对 PFOA 的捕获率达到了>99.9%。
