Redox-active rGO-nZVI nanohybrid-catalyzed chain shortening of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS)
Redox-active rGO-nZVI nanohybrid-catalyzed chain shortening of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS)
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DOI：
10.1016/j.hazl.2020.100007
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发表时间：
2020-12
影响因子：
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通讯作者：
Arvid Masud;M. G. Guardian;S. C. Travis;Nita G. Chavez Soria;Mourin Jarin;D. Aga;Nirupam Aich
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文献类型：
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作者：
Arvid Masud;M. G. Guardian;S. C. Travis;Nita G. Chavez Soria;Mourin Jarin;D. Aga;Nirupam Aich
全氟烷基和多氟烷基物质（PFAS）由于其强的C单键F键而是异常稳定的化学品。纳米级零价铁（nZVI）颗粒具有通过氧化还原活性去除和降解PFASs的潜力。在这项研究中，我们将nZVI沉积到二维还原氧化石墨烯（rGO）纳米片上，并测试了这些合成的rGO-nZVI纳米杂化物（NH）在有和没有H2 O2的水中处理短链和长链PFAS的混合物。所有PFAS去除率较高的rGO-nZVI NH比母体材料rGO和nZVI。值得注意的是，长链PFAS的去除速度比短链PFAS快。暴露于无H2 O2的rGO-nZVI NH 10 min后，长链PFAS（全氟辛烷磺酸（PFOS）和全氟辛酸（PFOA））分别被去除85%和39%，而短链PFAS（全氟戊烷磺酸和全氟戊酸）分别被去除19%和18%。H2 O2的添加使PFAS的处理性能提高了10- 18%，这可以归因于rGO-nZVI NH产生的活性氧物种。液相色谱高分辨率质谱分析证实，全氟辛烷磺酸和全氟辛酸都形成了独特的短链和部分脱氟的全氟辛烷磺酸-铁络合物。
Per- and polyfluoroalkyl substances (PFASs) are exceptionally stable chemicals due to their strong Csingle bondF bonds. Nanoscale zero-valent iron (nZVI) particles have the potential to remove and degrade PFASs through redox activity. In this study, we deposited nZVI onto two-dimensional reduced graphene oxide (rGO) nanosheets and tested these synthesized rGO-nZVI nanohybrid (NH) for the treatment of a mixture of short- and long-chain PFASs in water with and without H2O2. All PFASs were removed at a higher efficiency by the rGO-nZVI NH than by the parent materials rGO and nZVI. Notably, the long-chain PFASs were removed at a faster rate than the short-chain PFASs. After a 10 min exposure to the rGO-nZVI NH without H2O2, the long-chain PFASs (perfluorooctane sulfonic acid (PFOS) and perfluorooctanoic acid (PFOA)) were removed by 85 % and 39 %, respectively, while short-chain PFASs (perfluoropentane sulfonic acid and perfluoropentanoic acid) were removed by 19 % and 18 %, respectively. The addition of H2O2enhanced the PFAS treatment performance by 10–18 %, which can be attributed to the generation of reactive oxygen species by the rGO-nZVI NH. Liquid chromatography high-resolution mass spectrometry analysis confirmed the formation of unique shorter chain and partially defluorinated PFAS-Fe complexes from both PFOS and PFOA.