在共价有机框架中通过乙烯基定位进行电子结构调制,以增强低度捕获
Lingli Zhang1, Li Wang1, Feng Luo1
1National Key Laboratory of Uranium Resources Exploration-Mining and Nuclear Remote Sensing, East China University of Technology, Nanchang 330013, China.
在共价有机框架 (COF) 中嵌入框架的乙基显著提高了捕获能力. 这种设计原理在工业条件下为放射性去除提供了卓越的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 吸附科学 吸附科学
- 环境化学环境化学
背景情况:
- 从工业排放中捕获是一项挑战.
- 具有乙基的共价有机框架 (COF) 显示出对吸附的前景.
- 在COF中乙烯基基组的位置 (嵌入式与悬挂式) 影响性能.
研究的目的:
- 研究COF中乙烯基组定位对吸附的影响.
- 为了合成和表征嵌入框架的乙烯基-COF (TPEB-TAPB-COF),孔悬挂的乙烯基-COF (BPO-TAPB-COF) 和非乙烯基的COF (TFPB-TAPB-COF).
- 在和蒸汽和模拟工业条件下评估捕获性能.
主要方法:
- 三种不同的COF合成,具有不同的乙烯基组配置.
- 在和蒸汽下测量吸附能力.
- 在模拟的工业条件下 (150°C,150 ppmv I2) 进行吸附试验.
主要成果:
- 在和条件下,TPEB-TAPB-COF (嵌入框架) 实现了8.65g/g的高捕获能力.
- 在BPO-TAPB-COF中,相对依赖的乙基因组由于有限的电子移位而显示出减少的容量.
- 在模拟的工业条件下,TPEB-TAPB-COF表现出色 (0.493 g/g),性能优于大多数多孔材料.
结论:
- 嵌入框架的乙基增强了电子移位,导致COF中优异的吸附.
- 乙基的定位对于优化捕获中COF性能至关重要.
- 本研究提出了一个新的设计策略,用于开发先进的放射性捕获材料.
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