A recent overview of per- and polyfluoroalkyl substances (PFAS) removal by functional framework materials

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

“…6). A similar behaviour was also reported by Li et al 18 and van den Bergh et al 20 who observed a destabilization of PFOS and PFOA in air at about 318 and 365 °C, respectively. In sample L, however, the differences in both TG and XRD-analyses between the bare material and the PFAS loaded sample were minimal (about 1% in weight).…”

“…16,17 On important criteria for a high PFAS uptake capacity is the hydrophobic character of the adsorbent that has adequate microporosity and high specific surface area for PFAS sorption. 18,19 Zeolites are promising alternative sorbents for PFAS removal. They consist of crystalline microporous materials, defined by ordered 3D structure of linked tetrahedra TO 4 framework (T is a cation in tetrahedral coordination with oxygen, usually Si 4+ and Al 3+ ) delimited by cages, pores and channels usually occupied by water molecules and exchangeable extraframework cations.…”

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

“…We can speculate that Ag-zeolites, like granular activated carbon and other porous materials, could alter thermal decomposition pathways, accelerating PFAS degradation at temperatures <400 °C. 22 A similar effect was also reported for Fe-loaded all-silica beta type zeolites 53 that catalyze the oxidation and mineralization of PFOA intermediates. Variations of the occupancy of the extraframework sites affects the geometry of the framework thus producing temperature-dependent deformations in the apertures (Fig.…”

“…In the temperature range 700–1200 °C the thermogravimetric curve only accounted for a small fraction of the mass loss, essentially corresponding to the degradation of carbonaceous residues. According to Li et al , 53 the destabilization of PFOS and PFOA in air occurs at about 318 and 365 °C, respectively. At these temperatures, the first DTA peaks (Fig.…”

One-step synthesis of magnetic covalent organic framework composite for the adsorption of marine toxin okadaic acid

“…3 COFs are crystalline, fully organic porous materials featuring large surface areas, uniform pore sizes and shapes, tunable pore surfaces, and high chemical stabilities, [4][5][6][7] attractive properties in view of selective adsorption of a group of contaminants. Consequently, in the recent years bulk COFs as fine powders have been reported as novel adsorbents for batch adsorption of a wide variety of contaminants from water, such as biotoxins, 3,8 pharmaceuticals, [9][10][11][12] dyes, 13 perfluorinated compounds, 14 synthetic fragrances, 15 and heavy metal ions. 16 However, a typical COF synthesis results in a powder featuring polydisperse particles with sizes in the micrometre range, and using such material for batch adsorption of contaminants can lead to difficulties in its isolation from the sample matrix or high column backpressure when directly packed into a column for static adsorption.…”