TY - JOUR
T1 - Unlocking the sorption mechanism of perfluoroalkyl acids (PFAAs) on geosynthetics
T2 - Case of the geotextile components of geosynthetic clay liners
AU - Mikhael, Elissar
AU - Bouazza, Abdelmalek
AU - Gates, Will P.
AU - Haque, Asadul
N1 - Funding Information:
This project was funded in part by the Australian Research Council's Linkage Project scheme ( LP190101178 ) and the following industry partners: Geofabrics Australasia Pty. Ltd., Fabtech, TRI Australia, Solmax and Senversa. Their support is gratefully acknowledged. The authors acknowledge the Australian Research Council Linkage Infrastructure and Equipment Fund ( LE130100006 ) for establishing the X-ray Microscopy Facility for Imaging Geo-materials at the Department of Civil Engineering of Monash University . Finally, the authors acknowledge the use of instruments and technical assistance at the School of Chemistry Analytical Facility, Monash University.
Funding Information:
This project was funded in part by the Australian Research Council's Linkage Project scheme (LP190101178) and the following industry partners: Geofabrics Australasia Pty. Ltd. Fabtech, TRI Australia, Solmax and Senversa. Their support is gratefully acknowledged. The authors acknowledge the Australian Research Council Linkage Infrastructure and Equipment Fund (LE130100006) for establishing the X-ray Microscopy Facility for Imaging Geo-materials at the Department of Civil Engineering of Monash University. Finally, the authors acknowledge the use of instruments and technical assistance at the School of Chemistry Analytical Facility, Monash University.
Publisher Copyright:
© 2023 The Authors
PY - 2024/2
Y1 - 2024/2
N2 - We present here an experimental investigation on the sorption of four perfluoroalkyl acids (PFAAs): namely, two perfluorocarbonic acids (PFCAs) – perfluorooctanoic acid (PFOA) and perfluorohexanoic acid (PFHxA); and two perfluorosulfonic acids – perfluorooctane sulfonate (PFOS) and, perfluorobutane sulfonic acid (PFBS) to polypropylene cover and carrier geotextiles commonly used in geosynthetic clay liners. The impacts of various operational parameters, such as sorbent mass, contact time, and initial PFAA concentration, were investigated. A bi-exponential adsorption model was observed to describe the adsorption kinetics for all PFAAs sufficiently. The model indicates two (probably physically) different types of adsorption sites involved in the PFAAs adsorption. The Freundlich and Langmuir equations well represented the adsorption isotherms. Furthermore, it was observed that PFAA sorption was strongly dependent on the end functional groups and perfluorinated carbon chain length of PFAAs. The maximum adsorption capacities for all PFAAs on geotextiles were consistent with results obtained for clay minerals, indicating that, in the absence of sufficient organic matter, sorption of PFAAs onto solids is mainly analyte and solution dependent. The results obtained and reported for the first time herein are imperative for understanding the fate and migration of PFAAs in modern geosynthetic composite liner systems.
AB - We present here an experimental investigation on the sorption of four perfluoroalkyl acids (PFAAs): namely, two perfluorocarbonic acids (PFCAs) – perfluorooctanoic acid (PFOA) and perfluorohexanoic acid (PFHxA); and two perfluorosulfonic acids – perfluorooctane sulfonate (PFOS) and, perfluorobutane sulfonic acid (PFBS) to polypropylene cover and carrier geotextiles commonly used in geosynthetic clay liners. The impacts of various operational parameters, such as sorbent mass, contact time, and initial PFAA concentration, were investigated. A bi-exponential adsorption model was observed to describe the adsorption kinetics for all PFAAs sufficiently. The model indicates two (probably physically) different types of adsorption sites involved in the PFAAs adsorption. The Freundlich and Langmuir equations well represented the adsorption isotherms. Furthermore, it was observed that PFAA sorption was strongly dependent on the end functional groups and perfluorinated carbon chain length of PFAAs. The maximum adsorption capacities for all PFAAs on geotextiles were consistent with results obtained for clay minerals, indicating that, in the absence of sufficient organic matter, sorption of PFAAs onto solids is mainly analyte and solution dependent. The results obtained and reported for the first time herein are imperative for understanding the fate and migration of PFAAs in modern geosynthetic composite liner systems.
KW - GCLs
KW - Geosynthetics
KW - Geotextiles
KW - PFAS
KW - Sorption
UR - https://www.scopus.com/pages/publications/85171160253
U2 - 10.1016/j.geotexmem.2023.09.002
DO - 10.1016/j.geotexmem.2023.09.002
M3 - Article
AN - SCOPUS:85171160253
SN - 0266-1144
VL - 52
SP - 59
EP - 71
JO - Geotextiles and Geomembranes
JF - Geotextiles and Geomembranes
IS - 1
ER -