双封闭的超细集群用于高效的过氧化物激活
Xiaowen Xie1, Mingshan Zhu2, Fei Xiao1
1School of Environmental Science and Engineering, Sun Yat-Sen University, 132 East Waihuan Road, Guangzhou 510000, P. R. China.
JACS Au
|May 26, 2023
概括
超细 (Co) 集群被限制在N-doped carbon mesoporous silica (NC@mSiO2) 中,在激活过氧化硫酸盐 (PMS) 进行高级氧化过程 (AOPs) 方面表现出卓越的性能. 这种新型催化剂在广泛的pH范围内表现出高活性和耐用性,在催化剂设计方面取得了突破.
科学领域:
- 材料科学 材料科学 材料科学
- 环境化学环境化学
- 催化剂是一种催化剂.
背景情况:
- 过氧化物激活对于先进的氧化过程 (AOPs) 至关重要,但在催化剂开发中面临挑战.
- 设计高活性和稳定的催化剂以有效降解污染物仍然是一个重大障碍.
研究的目的:
- 开发一种具有增强活性和耐久性的新型催化剂,用于在AOP中激活过氧化物.
- 在催化污染物降解过程中研究封闭金属集群的结构-活性关系.
主要方法:
- 简单的合成超细 (Co) 集群被限制在N-doped碳点装饰的半孔二氧化纳米圈 (Co/NC@mSiO2) 使用双封闭策略.
- 在各种pH条件下使用过氧硫酸盐 (PMS) 进行有机污染物去除的催化性能评估.
- 密度函数理论 (DFT) 计算以阐明催化机制和电子结构.
主要成果:
- 与未受限制的催化剂相比,Co/NC@mSiO2表现出前所未有的催化活性和耐用性.
- 催化剂在广泛的pH范围 (2-11) 中表现出有效的污染物降解,离子浸出最小.
- DFT的计算和实验结果证实了强大的PMS吸附,高效的电荷转移和Co集群的优化电子结构,促进HO•和SO4•−基的产生.
结论:
- 双封闭的Co/NC@mSiO2催化剂在设计高效和稳定的过氧化物激活催化剂方面取得了根本性的突破.
- 封闭的Co集群,N-doped碳点和半孔之间的协同效应通过优化电子特性和促进激素生成来增强催化性能.
- 这项工作为环境修复中先进催化剂的设计原则提供了宝贵的见解.
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