通过合成后的修改来改善UiO-66的吸水性能
Guodong Fu1, Ping Wu1, Shiping Zhang1
1Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China. pingwu@sas.ustb.edu.cn.
Dalton transactions (Cambridge, England : 2003)
|August 8, 2023
概括
合成后的连接物交换增强了缺陷的UiO-66金属有机框架 (MOFs),以改善水吸附. 这种修改策略为开发可逆吸附应用的先进材料提供了一个有希望的途径.
科学领域:
- 材料科学 材料科学 材料科学
- 化学 化学 化学
- 纳米技术 纳米技术
背景情况:
- 合成后修改 (PSM) 允许在组装后对材料进行结构和功能调整.
- 金属有机框架 (MOFs) 可以使用PSM技术进行修改,例如缺陷控制,金属位点替换和连接体功能化.
研究的目的:
- 通过通过后合成联体交换 (PSE) 引入含有N功能或氨基组的联体来改善缺陷的UiO-66的吸水性能.
- 评估连接物修饰对水吸附能力,水友性和循环稳定的影响.
主要方法:
- 合成了缺陷的UiO-66,然后用新的有机配体进行了合成后配体交换 (PSE).
- 用水吸附能力,半吸附值 (α) 和亨利常数 (KH) 来表征水吸附性能.
主要成果:
- 在UiO-66框架中,PSE成功地引入了新的配体,为水分子创造了吸附点.
- 与未经修改,无缺陷的UiO-66.6相比,经过修改的样本显示出明显优越的吸水能力和水友性.
- H-UiO-66-PyDC样本显示了最高的配体替代和显著的水吸收增强 (0.08到0.23gg-1在P/P0=0.30) 和水友性 (α从0.36降低到0.28).
- 所有经过修改的样本都在20个吸附/脱附周期中表现出极好的循环稳定性.
结论:
- 将缺陷调制与PSE相结合是一种有效的策略,可以增强UiO-66.6的吸水性能.
- 修改后的UiO-66材料显示出需要可逆吸附水的应用的潜力.
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