Ranwen Ou1, Huacheng Zhang1, Jing Wei1, Seungju Kim1, Li Wan1, Nhi Sa Nguyen1, Yaoxin Hu1, Xiwang Zhang1, George P. Simon2, Huanting Wang1
1Department of Chemical Engineering, Monash University, Clayton, Victoria 3800, Australia
2Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia
Tóm tắt
AbstractRegenerable, high‐efficiency salt sorption materials are highly desirable for water treatment. Here, a thermoresponsive, amphoteric metal–organic framework (MOF) material is reported that can adsorb multiple salts from saline water at room temperature and effectively release the adsorbed salts into water at elevated temperature (e.g., 80 °C). The amphoteric MOF, integrated with both cation‐binding carboxylic groups and anion‐binding tertiary amine groups, is synthesized by introducing a polymer with tertiary amine groups into the cavities of a water‐stable MOF such as MIL‐121 with carboxylic groups inside its frameworks. The amphoterized MIL‐121 exhibits excellent salt adsorption properties, showing stable adsorption–desorption cycling performances and high LiCl, NaCl, MgCl2, and CaCl2 adsorption capacities of 0.56, 0.92, 0.25, and 0.39 mmol g−1, respectively. This work provides a novel, effective strategy for synthesizing new‐generation, environmental‐friendly, and responsive salt adsorption materials for efficient water desalination and purification.
