从水,空气和阳光中直接光合作用过氧化的共价有机框架
Fuyang Liu1,2,3, Peng Zhou4, Yanghui Hou1,2,3
1College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China.
Nature communications
|July 19, 2023
概括
无金属共价有机框架 (COFs) 通过太阳光合作用促进过氧化 (H2O2) 的产生. 优化的COF增强了电荷生成和分离,使水和空气有效合成H2O2.
科学领域:
- 材料科学 材料科学 材料科学
- 摄影化学的使用.
- 绿色化学 绿色化学
背景情况:
- 太阳能驱动的光合作用为过氧化 (H2O2) 生产提供了一个可持续的途径.
- 目前使用无金属共价有机框架 (COF) 的方法受到侧面反应和低效的光生成电荷动态的限制.
- 提高电荷生成,分离和转移对于高效的H2O2光催化是至关重要的.
研究的目的:
- 设计和合成捐赠者-接受者COFs用于增强太阳能驱动的H2O2光合作用.
- 研究分子内极性和电子结构在提高H2O2生产效率中的作用.
- 为了证明这些COF在水污染治理中的实际应用.
主要方法:
- 提供者-接受者共价有机框架 (COF) 的合成,具有可调节的分子内极性.
- 光催化实验使用水,氧和可见光来产生H2O2.2.
- 在现场表征技术和计算计算以阐明反应机制.
- 在使用自然阳光的各种水类 (水龙头,河流,海水) 中测试H2O2生产.
主要成果:
- 在没有牺牲剂的情况下,达到605μmol g-1 h-1的高H2O2产率.
- 最佳的分子内极性,以基捐赠物实现,最大限度地产生免费电荷.
- 特定的N2p状态的triazine N位点被确定为H2O激活和选择性氧化的关键.
- 在各种水体中使用自然阳光和空气证明了高效的H2O2生产.
结论:
- 具有优化分子内极性的供体-受体COF代表了有效的太阳H2O2光合作用的一个有希望的策略.
- 氧化的电子结构,特别是三酸N位,在催化活性中起着关键作用.
- 这项技术有可能用于可持续的H2O2生成和水污染消除应用.
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