Data for the published results in Chemosphere Journal. This includes regeneration efficiency data and GAC characterization data. This dataset is associated with the following publication: Didenko, T., A. Lau, A.L. Purohit, J. Feng, B. Pinkard, M. Ateia, and I.V. Novosselov. Regeneration of PFAS-laden granular activated carbon by modified supercritical CO2 extraction. CHEMOSPHERE. Elsevier Science Ltd, New York, NY, USA, 370: 143986, (2025).