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Title:Transformation and mitigation of PFAS with nNi0Fe0-activated carbon nanocomposites
Author(s):Modiri Gharehveran, Mahsa
Subject(s):per- and polyfluoroalkyl substances
Abstract:Presented by: Mahsa Modiri Gharehveran – Post-Doctoral Research Assistant at Purdue University, Co-authors: Jenny E. Zenobio, Younjeong Choi, Linda S. Lee Abstract: We previously exemplified that zero valent iron particles (nFe0) with ~2 wt% Ni synthesized onto activated carbon (AC) defluorinated and desulfonated perfluorooctane sulfonate (PFOS). Here we present a summary of our work on reductive transformation by nNi0Fe0-AC at 50 and 60 °C of several perfluoroalkyl acids (PFAAs), two fluorotelomer sulfonates (6:2 and 8:2 FTS), and GenX. Single solute reactions were done in batch systems while PFAA mixture reactions were done in both batch and column systems. Column studies were conducted at 60 °C or 50 °C with different reaction bed compositions and different influent flow-rates. In batch systems with single solutes, nNiFe0-AC transformed PFAAs, 6:2 FTS, 8:2 FTS, and GenX with higher or equal transformation at 50° compared to 60 °C. % Defluorination was highest for perfluoroalkyl sulfonates and longer chain length with highest at ~94% for PFOS at 50 °C. For column studies, PFAA break-through followed chain length and reactivity. Longer residence time resulted in a greater fraction of the PFAA mixture being transformed and defluorinated. Fluorine mole balance achieved in the column studies approached 73% with fluoride accounting for ~23% of the PFAAs transformed whereas in the batch PFAA mixture reactions, fluoride generated accounted for all PFAAs transformed. Biography: Mahsa Modiri, Ph.D. is currently a post-doctoral research assistant in the Department of Agronomy and in the area of environmental chemistry at Purdue University under the guidance of Dr. Linda Lee. Mahsa earned her Ph.D. degree from Purdue University in Civil/Environmental ENG. Her research currently is focused on different aspects of the fate, transport, and remediation of per- and polyfluoroalkyl substances (PFAS) as one of the most important emerging contaminants and occurrence of PFAS in biosolids used as soil-amendments.
Issue Date:2021-04-28
Genre:Presentation / Lecture / Speech
Conference Paper / Presentation
Date Available in IDEALS:2021-04-23

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