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      SCOPUS SCIE

      Reductive degradation of perfluorinated compounds in water using Mg-aminoclay coated nanoscale zero valent iron

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      https://www.riss.kr/link?id=A107741699

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      다국어 초록 (Multilingual Abstract)

      <P><B>Abstract</B></P> <P>Perfluorinated compounds (PFCs) are extremely persistent micropollutants that are detected worldwide. We studied the removal of PFCs (perfluorooctanoic acid; PFOA, perfluorononanoic acid; PFNA, ...

      <P><B>Abstract</B></P> <P>Perfluorinated compounds (PFCs) are extremely persistent micropollutants that are detected worldwide. We studied the removal of PFCs (perfluorooctanoic acid; PFOA, perfluorononanoic acid; PFNA, perfluorodecanoic acid; PFDA and perfluorooctane sulfonate; PFOS) from water by different types of nanoscale zero-valent iron (nZVI). Batch experiments showed that an iron dose of 1gL<SUP>−1</SUP> in the form of Mg-aminoclay (MgAC) coated nZVI, at an initial pH of 3.0 effectively removed 38–96% of individual PFCs. An increasing order of removal efficiency was observed of PFOA<PFNA<PFOS≈PFDA. Compared to this, PFCs removal was less than 27% using a commercial air stabilized nZVI or freshly synthesized uncoated nZVI, under the same experimental conditions. The effectiveness of PFCs removal by MgAC coated nZVI was further investigated at various initial pH, nZVI dosage, temperature and age of the nZVI. A maximum removal was observed for all PFCs with high nZVI concentration, freshly synthesized nZVI, low pH and low temperature. A mass balance experiment with PFOS in a higher concentration of nZVI revealed that the removal was due to both sorption and degradation. Fluoride production partially matched the observed degradation, while no organic byproducts were detected using LC–QTOF–MS.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Different nanosized zero valent iron (nZVI) types were tested for PFCs degradation. </LI> <LI> Only nZVI coated with a cationic surface modifier removed PFCs effectively. </LI> <LI> The order of PFCs degradability was PFOA<PFNA<PFOS≈PFDA. </LI> <LI> Low pH and temperature favored degradation of PFCs by surface modified nZVI. </LI> <LI> Fluoride formation confirmed PFCs degradation while partial sorption was observed. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

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