缺陷工程MOF/COF S-Scheme异质连接与双通道电荷传输,用于超高效的太阳能重金属修复
Yuqian Zhong1,2, Xinpeng Wang2, Weiqun Shi3
1Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, P. R. China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|January 15, 2026
概括
这项研究引入了一种新的S模式异构连接,使用有机金属框架 (MOF) 和具有氧空缺的共价有机框架 (COF). 这种缺陷介导的双重运输策略显著提高了重金属去除的光催化性能.
科学领域:
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
- 光催化作用的光催化
背景情况:
- 光催化剂的性能受到快速载体重组和常规异质连接中低效的电荷分离的限制.
- 不良的格子匹配和单向重组阻碍了现有的光催化系统中的电荷传递.
研究的目的:
- 为了克服传统光催化剂的局限性,通过构建由氧空位 (OV) 介导的S-scheme异质连接.
- 为了增强载体分离并保持氧化还原潜力,使用MOF和COF之间的共价桥.
- 为太阳能驱动的环境净化开发一个通用的缺陷中介双重运输战略.
主要方法:
- 在金属有机框架 (MOF) 和共价有机框架 (COF) 之间通过共价桥梁构建了一个新的S模式异质连接.
- 使用真空处理来创建陷状态并提高载体寿命的工程氧气空缺 (OVs).
- 使用 femtosecond 暂时吸收光谱 (fs-TAS) 来研究载体动态.
主要成果:
- 通过OVs介导的S-scheme架构引入了双通道的充电传输,大大提高了载波分离.
- 由OVs诱导的陷状态将载体寿命延长到278ps,比原始材料长2.5倍.
- 实现了多重金属离子的特殊去除效率,UO22+的去除率是原始MOF和COF的8.8和17.1倍.
结论:
- 与OVs构建的MOF-COF异构连接显示出卓越的光催化活性和稳定性.
- 缺陷介导的双重运输策略为有效的太阳能驱动环境修复提供了一个有希望的方法.
- 这项工作为设计用于能源转换和环境净化的先进光催化剂提供了新的见解.
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