PFAS as emerging pollutants in the environment: A challenge with FAU type and silver-FAU exchanged zeolites for their removal from water

High temperature behaviour of Ag-exchanged Y zeolites used for PFAS sequestration from water

“…Refinement of in situ X-ray data: temperature-dependent variations of unit cell parameters and crystal-structure AgY760. The Rietveld structure refinement of the AgY760 sample at room temperature was in perfect agreement with that given by Mancinelli et al 14 The difference Fourier map, generated using the GSAS package, confirmed the Ag + distribution reported by Mancinelli et al 14 These cations were localized at three different cation sites: at the center of the hexagonal prism (Ag(I) site), in the sodalite cage (Ag(I 0 ) site) and between the supercage and the sodalite cage (Ag(IIb) site) (Fig. 3).…”

“…AgY760-PFOS and AgY760-PFOA. The Rietveld structure refinements of the PFAS loaded AgY760 samples (labelled AgY760-PFOS and AgY760-PFOA, respectively) were performed using the room temperature structural model reported by Mancinelli et al 14 PFOS and PFOA molecules are almost centered in the supercage where they can assume six different orientations (Fig. 8).…”

Electrochemical Reduction of Perfluorooctanoic Acid (PFOA): An Experimental and Theoretical Approach

“…These observations suggest that this peak arises from capacitive current due to the adsorption of PFOA into the surface of the silver electrode and not due to its reduction. 49,50 The signal at −1.68 V observed with the gold working electrode is stable and did not disappear after several runs or upon stirring. The mass transport zone is observed between −1.68 and −1.75 V before the water reduction current starts to increase again.…”

Exploring the adsorption of short and long chain per- and polyfluoroalkyl substances (PFAS) to different zeolites using environmental samples

“…Y760 and Y390 were also used in their Ag exchanged form as reported in Mancinelli et al , 2022. 30 In addition to the 9 organophilic zeolites, powder activated carbon (PAC, Pulsorb) was tested as a comparison to AC sorbents purchased from Calgon Carbon Corporation (Moon Township, PA, USA).…”

“…Additionally, Ag in Y390 and Y760 zeolites does likely not compete with the adsorption sites and could favor catalytic reactions in PFAS degradation. 30 In a real application, Ag could provide Environmental Science: Water Research & Technology Paper antibiofouling and bactericidal properties to zeolites, increasing the lifetime of the material and allowing a constant permeation of the flow preventing clogging of the pores. 39 PAC tested at the same conditions showed 98.5% for P PFAS uptake, reaching the equilibrium after 15 min (Fig.…”