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Adsorption to granular activated carbon (GAC) has been frequently used at pilot- and full-scale operations for treatment of water impacted by per- and polyfluoroalkyl substances (PFAS). The predominant residual from GAC systems is spent or exhausted carbon that contains elevated levels of PFAS. In this proof-of-concept project, the behavior and decomposition mechanisms of PFAS laden on GAC in various thermal processes will be investigated. Building on preliminary data already obtained by the project team, this collaborative project has four specific objectives:
During this project, the project team will employ the following methodologies:
Thermal decomposition kinetics (e.g., half-lives), thermodynamics, and pathways of PFAS with different chain lengths and functionalities will be determined. Also, the modification of GAC with ammoxidation and impregnation approaches will be investigated and the performance of raw/tailored GAC for PFAS removal from natural waters and NF/RO brine with multiple cycles of adsorption‒reactivation‒reuse will be evaluated. Preliminary results show great promise for these strategies.
It is envisioned that the results of this study will help to:
The results of this project will benefit the Department of Defense (DoD) as well as many other end-users and stakeholders. (Project Completion - 2023)
Alinezhad, A., P. Challa Sasi, P. Zhang, B. Yao, S. Golovko, M. Golovko, A. Kubátová, and F. Xiao. 2022. An Investigation of Thermal Air Degradation and Pyrolysis of PFAS and PFAS Alternatives in Soil. ACS ES&T Engineering, 2(2):198-209. doi.org/10.1021/acsestengg.1c00335.
Alinezhad, A., H. Shao, K. Litvanova, R. Sun, A. Kubatova, W. Zhang, Y. Li, and F. Xiao. 2023. Mechanistic Investigations of Thermal Decomposition of Perfluoroalkyl Ether Carboxylic Acids and Short-Chain Perfluoroalkyl Carboxylic Acids. Environmental Science & Technology, 57(23):8796-8807. doi.org/10.1021/acs.est.3c00294.
Challa Sasi, P., A. Alinezhad, B. Yao, A. Kubátová, S. Golovko, M, Golovko, and F. Xiao. 2021. Effect of Granular Activated Carbon and Other Porous Materials on Thermal Decomposition of Per- and Polyfluoroalkyl Substances: Mechanisms and Implications for Water Purification. Water Research, 200:117271. doi.org/10.1016/j.watres.2021.117271.
Wang, Z., A. Alinezhad, R. Sun, F. Xiao, and J.J. Pignatello. 2023. Pre- and Postapplication Thermal Treatment Strategies for Sorption Enhancement and Reactivation of Biochars for Removal of Per- and Polyfluoroalkyl Substances from Water. ACS ES&T Engineering, 3(2):193‒200. doi.org/10.1021/acsestengg.2c00271.
Wang, Z., A. Alinezhad, S. Nason, F. Xiao, and J.J. Pignatello. 2023. Enhancement of Per- and Polyfluoroalkyl Substances Removal from Water by Pyrogenic Carbons: Tailoring Carbon Surface Chemistry and Pore Properties. Water Research, 29:119467. doi.org/10.1016/j.watres.2022.119467.
Xiao, F. 2022. A Review of Biochar Functionalized by Thermal Air Oxidation. Environmental Functional Materials, 1(2):187-195. doi.org/10.1016/j.efmat.2022.03.001.