用于去除水中全氟辛烷磺酸的磁性氨基功能化氧化石墨烯纳米复合材料

IF 3.5 Q3 ENGINEERING, ENVIRONMENTAL
Shokouh Mahpishanian, Muchu Zhou, Reza Foudazi
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引用次数: 0

摘要

全氟烷基和多氟烷基物质(PFAS)这种 "永远的化学品 "因其毒性和生物蓄积性已成为对公众健康和环境的威胁。针对这一关键问题,我们开发了一种最先进的纳米复合吸附剂,将胺官能团共价接枝到氧化石墨烯(GO)表面,并用氧化铁(Fe3O4)纳米粒子使其具有磁性。这一过程产生了磁性胺功能化氧化石墨烯(MAGO)。我们评估了 MAGO 在不同实验条件下吸附去除长链和短链 PFAS 模型全氟辛酸 (PFOA)、全氟辛烷磺酸 (PFOS)、全氟己烷磺酸 (PFHxS) 和全氟丁烷磺酸 (PFBS) 的效率。我们的研究结果表明,在短短 30 分钟内,MAGO 对长链全氟辛烷磺酸和短链全氟辛烷磺酸的去除率分别超过了 95% 和 85%。这些结果表明,GO 和胺基团具有协同效应,可利用静电和疏水相互作用吸附 PFAS 分子。MAGO 不仅能有效去除污染物,还具有令人印象深刻的再生能力。此外,我们还展示了一种新颖的液相萃取法检测全氟辛烷磺酸,利用彩色亚甲基蓝-全氟辛烷磺酸复合物进行分光光度分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Magnetic amino-functionalized graphene oxide nanocomposite for PFAS removal from water

Magnetic amino-functionalized graphene oxide nanocomposite for PFAS removal from water
The “forever chemicals”, per- and polyfluoroalkyl substances (PFAS), have become a threat to public health and environment because of their toxicity and bioaccumulation. Addressing this critical issue, we develop a state-of-the-art nanocomposite adsorbent by covalently grafting amine functional groups onto graphene oxide (GO) surfaces and making them magnetic with iron-oxide (Fe3O4) nanoparticles. This process results in the creation of magnetic amine-functionalized graphene oxide (MAGO). The efficiency of MAGO is evaluated in the adsorptive removal of perfluorooctanoic acid (PFOA), perfluorooctane sulfonate (PFOS), perfluorohexane sulfonate (PFHxS), and perfluorobutane sulfonate (PFBS) as model long-chain and short-chain PFAS under different experimental conditions. Our findings reveal that MAGO achieves remarkable removal rates—exceeding 95% for long-chain PFAS and 85% for short-chain PFAS within just 30 minutes—demonstrating not only rapid kinetics but also a resilience across pH levels from 4 to 7. These results are indicative of the synergistic effects of GO and amine groups, harnessing both electrostatic and hydrophobic interactions to adsorb PFAS molecules. MAGO not only shows potent pollutant removal but also has impressive regeneration capabilities. Moreover, we demonstrate a novel liquid phase extraction method for PFAS detection, utilizing a colored methylene blue-PFAS complex for spectrophotometric analysis.
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