Supporting Information Discerning the Relevance of Superoxide in PFOA Degradation Hassan Javed 1,2 * , Jordin Metz 1, 2 * , Toprak C. Eraslan 2, 3 , Jacques Mathieu 4, 5 , Bo Wang 2,6 , Gang Wu 7 , Ah-Lim Tsai 7 , Michael S. Wong 1, 2, 3, 4, 6 , and Pedro J.J. Alvarez 1, 2, 3, 4, 6 † 1 Dept.of Chemistry, Rice University, Houston, Texas, United States 77005. 2 Nanosystems Engineering Research Center for Nanotechnology Enabled Water Treatment (NEWT) 3 Dept. of Materials Science and Nanoengineering, Rice University, Houston, Texas, United States 77005. 4 Dept. of Civil and Environmental Engineering, Rice University, Houston, Texas, United States 77005. 5 Sentinel Environmental LLC, Houston, Texas, United States. 6 Dept. of Chemical and Biomolecular Engineering, Rice University, Houston, Texas, United States 77005 7 Division of Hematology, Department of Internal Medicine, University of Texas-McGovern Medical School at Houston, Houston, TX, 77030, USA * Both authors contributed equally to this work. † Corresponding Author: alvarez@rice.edu