The adsorption efficiency of Zeolites Y (FAU-type topology) with different silica/alumina ratio towards perfluorooctanoic acid (PFOA, C8HF15O2) and perfluorooctane sulfonate (PFOS, C8F17SO3H), was investigated by combining batch adsorption and synchrotron X-ray powder diffraction (XRPD) analyses. Adsorption isotherms show that the saturation capacity of Y390 as-synthesized and Ag-exchanged sample, was for PFOA was ~43% and ~62%, and for PFOS was ~17% and ~32% in weight respectively. XRPD Rietveld refinements provided the exact location of PFOA and PFOS in the zeolites network before and after functionalization with Ag. PFAS are located at the center of the supercage, H- bonded to both co-adsorbed water molecules and framework oxygen atoms. Y-PFOA/PFOS and AgY-PFOA/PFOS oligomers strongly interact with oxygen atoms of the zeolite framework, thus immobilizing the pollutants in the zeolite microporosity. These findings indicated that these materials can be successfully used for the decontamination of water from perfluoroalkyl chemicals. Additionally, introduction of Ag onto zeolites could confer combined antifouling and adsorption properties thus exhibiting improved performances compared to zeolite as single compounds thus working synergistically in removal of PFAS from water.

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

Mancinelli, Maura
Primo
;
Stevanin, Claudia
Secondo
;
Ardit, Matteo;Chenet, Tatiana;Pasti, Luisa
Penultimo
;
Martucci, Annalisa
Ultimo
2022

Abstract

The adsorption efficiency of Zeolites Y (FAU-type topology) with different silica/alumina ratio towards perfluorooctanoic acid (PFOA, C8HF15O2) and perfluorooctane sulfonate (PFOS, C8F17SO3H), was investigated by combining batch adsorption and synchrotron X-ray powder diffraction (XRPD) analyses. Adsorption isotherms show that the saturation capacity of Y390 as-synthesized and Ag-exchanged sample, was for PFOA was ~43% and ~62%, and for PFOS was ~17% and ~32% in weight respectively. XRPD Rietveld refinements provided the exact location of PFOA and PFOS in the zeolites network before and after functionalization with Ag. PFAS are located at the center of the supercage, H- bonded to both co-adsorbed water molecules and framework oxygen atoms. Y-PFOA/PFOS and AgY-PFOA/PFOS oligomers strongly interact with oxygen atoms of the zeolite framework, thus immobilizing the pollutants in the zeolite microporosity. These findings indicated that these materials can be successfully used for the decontamination of water from perfluoroalkyl chemicals. Additionally, introduction of Ag onto zeolites could confer combined antifouling and adsorption properties thus exhibiting improved performances compared to zeolite as single compounds thus working synergistically in removal of PFAS from water.
2022
Mancinelli, Maura; Stevanin, Claudia; Ardit, Matteo; Chenet, Tatiana; Pasti, Luisa; Martucci, Annalisa
File in questo prodotto:
File Dimensione Formato  
hdl 113922490671.pdf

solo gestori archivio

Descrizione: versione editoriale
Tipologia: Full text (versione editoriale)
Licenza: NON PUBBLICO - Accesso privato/ristretto
Dimensione 9.91 MB
Formato Adobe PDF
9.91 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2490671
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 13
  • ???jsp.display-item.citation.isi??? 11
social impact