Ou Ranwen, Zhang Huacheng, Wei Jing, Kim Seungju, Wan Li, Nguyen Nhi Sa, Hu Yaoxin, Zhang Xiwang, Simon George P, Wang Huanting
Department of Chemical Engineering, Monash University, Clayton, Victoria, 3800, Australia.
Department of Materials Science and Engineering, Monash University, Clayton, Victoria, 3800, Australia.
Adv Mater. 2018 Jul 10:e1802767. doi: 10.1002/adma.201802767.
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 , and CaCl adsorption capacities of 0.56, 0.92, 0.25, and 0.39 mmol g , 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.
可再生的高效盐吸附材料对于水处理来说是非常理想的。在此，报道了一种热响应性两性金属有机框架（MOF）材料，它能够在室温下从盐水中吸附多种盐，并在高温（例如80°C）下将吸附的盐有效地释放到水中。这种两性MOF集成了阳离子结合羧基和阴离子结合叔胺基团，通过将带有叔胺基团的聚合物引入到具有羧基的水稳定MOF（如MIL-121）的孔穴中合成。两性化的MIL-121表现出优异的盐吸附性能，具有稳定的吸附-解吸循环性能，对LiCl、NaCl、MgCl₂和CaCl₂的吸附容量分别高达0.56、0.92、0.25和0.39 mmol g⁻¹。这项工作为合成新一代环境友好型、响应型盐吸附材料以实现高效水脱盐和净化提供了一种新颖有效的策略。
