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Surface-enhanced Raman scattering (SERS) detection of fluorosurfactants in firefighting foams

机译:表面增强拉曼散射(SERs)在消防泡沫中检测含氟表面活性剂

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摘要

We demonstrated SERS (surface-enhanced Raman scattering) detection of fluorosurfactants (FSs), which are commonly formulated in aqueous firefighting foams (AFFFs), by increasing their loading affinity and boosting their Raman activity. In order to increase FS's loading affinity, we introduced a cationic dye (ethyl violet or methyl blue) into the aqueous incubation solution to co-precipitate the FS onto the SERS substrate surface by forming an immiscible ion-pair (dye-FS). In the meantime, the Raman signal intensity was boosted due to the much higher Raman activity of the dye than that of FS. We compared two kinds of SERS substrate, patterned silver (Ag) surface and graphene oxide (GO) membrane, and noted the former (dye-FS-Ag) enhanced the Raman signal whilst the latter (dye-FS-GO) increased the loading affinity of the ion-pair due to the hydrophobic surface. We thus introduced silver nanoparticles (AgNPs) into the incubation solution (as well as dye) to co-precipitate FS onto the GO surface via an assembly of dye-FS-AgNP-GO. Using this assembly, we successfully detected FSs including pentadecafluorooctanoic acid (PFOA), perfluorooctanesulfonic acid (PFOS), and 1H,1H,2H,2H-perfluorooctanesulfonic acid (6: 2FTS), with a limit-of-detection (LOD) of similar to 50 ppb (similar to 120 nM) for PFOA.
机译:我们展示了氟胶质剂(FSS)的SERS(表面增强拉曼散射)检测,其通常在消防泡沫(AFFF)中通常配制,通过增加其负载亲和力并促进其拉曼活性。通过形成不混溶的离子对(染料-FS),以增加FS的装载亲和力,我们引入了一个阳离子染料(乙基紫或甲基蓝)到含水孵育溶液到共同沉淀FS到SERS衬底表面。同时,由于染料的较高的拉曼活性而不是FS的拉曼活性,拉曼信号强度升高。我们比较2种SERS衬底的,图案化的银(Ag)表面和石墨烯氧化物(GO)膜,并指出前者(染料-FS-Ag)的增强拉曼而后者(染料-FS-GO)信号增加了装载离子对引起的疏水表面的亲和力。因此,我们将银纳米颗粒(AgNP)引入温育溶液(以及染料)中,通过染料-FS-AgNP-Go的组装将Fs共沉淀到去表面上。使用该组件中,我们成功地检测到FSS包括十五氟辛酸(PFOA),全氟辛烷磺酸(PFOS),和1H,1H,2H,2H-全氟辛烷磺酸(6:2FTS)的相似,具有极限的检测(LOD) PFOA的50 ppb(类似于120 nm)。

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  • 来源
    《RSC Advances》 |2016年第14期|共6页
  • 作者

    Fang C.; Megharaj M.; Naidu R.;

  • 作者单位

    Univ Newcastle GCER ATC Bldg Callaghan NSW 2308 Australia;

    Univ Newcastle GCER ATC Bldg Callaghan NSW 2308 Australia;

    Univ Newcastle GCER ATC Bldg Callaghan NSW 2308 Australia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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