S1 [Supporting Information] Three-Dimensional Ionic Covalent Organic Frameworks for Rapid, Reversible and Selective Ion Exchange Zonglong Li, † Hui Li, † Xinyu Guan, † Junjie Tang, † Yusran Yusran, † Zhan Li, † Ming Xue, † Qianrong Fang, ∗ ,† Yushan Yan, ‡ Valentin Valtchev ∗ ,†,∥ and Shilun Qiu ∗ ,† † State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, P. R. China ‡ Department of Chemical and Biomolecular Engineering, Center for Catalytic Science and Technology, University of Delaware, Newark, DE 19716, USA Normandie Univ, ENSICAEN, UNICAEN, CNRS, Laboratoire Catalyse et Spectrochimie, 6 Marechal Juin, 14000 Caen, France Contents: Section 1. Materials and characterization Section 2. Figures S1-42 Section 3. Tables S1-6 Section 4. References