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CAPTURE OF PERFLUOROOCTANOIC ACID USING OIL-FILLED GRAPHENE OXIDE-SILICA HYBRID CAPSULES
Ali, M., S.P. Meaney, L.W. Giles, P. Holt, M. Majumder, and R.F. Tabor.
Environmental Science & Technology 54(6):3549-3558
Water-dispersible hybrid capsules were prepared from an oil-in-water emulsion that included a silicate precursor and were stabilized by graphene oxide to grow a strong, mesoporous capsule. The aminated capsules were effectively applied as a novel technology to adsorb and sequester PFOA contamination in water. These capsules were decorated with amine groups to present a positively charged outer corona that attracted the negative PFOA molecules. 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.
Environmental Science & Technology 54(6):3549-3558
Water-dispersible hybrid capsules were prepared from an oil-in-water emulsion that included a silicate precursor and were stabilized by graphene oxide to grow a strong, mesoporous capsule. The aminated capsules were effectively applied as a novel technology to adsorb and sequester PFOA contamination in water. These capsules were decorated with amine groups to present a positively charged outer corona that attracted the negative PFOA molecules. 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.
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