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Thermoresponsive Amphoteric Metal–Organic Frameworks for Efficient and Reversible Adsorption of Multiple Salts from Water
Author(s) -
Ou Ranwen,
Zhang Huacheng,
Wei Jing,
Kim Seungju,
Wan Li,
Nguyen Nhi Sa,
Hu Yaoxin,
Zhang Xiwang,
Simon George P.,
Wang Huanting
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201802767
Subject(s) - adsorption , salt (chemistry) , metal organic framework , materials science , sorption , amine gas treating , tertiary amine , desorption , carboxylate , polymer , desalination , chemical engineering , metal , inorganic chemistry , metal ions in aqueous solution , polymer chemistry , organic chemistry , chemistry , biochemistry , membrane , engineering , metallurgy , composite material
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, MgCl 2 , and CaCl 2 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.