Abstract
Regenerable, 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.
Original language | English |
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Article number | 1802767 |
Number of pages | 8 |
Journal | Advanced Materials |
Volume | 30 |
Issue number | 34 |
DOIs | |
Publication status | Published - 23 Aug 2018 |
Keywords
- Amphoteric
- Desalination
- Metal-organic frameworks
- Regenerable salt adsorbents
- Thermoresponsive
Equipment
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Centre for Electron Microscopy (MCEM)
Peter Miller (Manager)
Office of the Vice-Provost (Research and Research Infrastructure)Facility/equipment: Facility