One step synthesis of nitrogen-rich covalent organic frameworks with flexible secondary amine bonds for efficient iodide capture in aqueous solutionsZiqian Han, Honghan Long, Jie Zhang, Mengyao Wen, Yang Li and Lijian MaNatl Sci Open, 4 1 (2025) 20240023DOI: https://doi.org/10.1360/nso/20240023