催化作用
吸附
纳米颗粒
光催化
光化学
化学
臭氧
反应性(心理学)
材料科学
穆斯堡尔谱学
化学工程
X射线光电子能谱
纳米技术
物理化学
结晶学
有机化学
病理
工程类
医学
替代医学
作者
Hongbin Cao,Jing Wang,Jae Hong Kim,Zhuang Guo,Jiadong Xiao,Yang Jin,Junjun Chang,Yanchun Shi,Yongbing Xie
标识
DOI:10.1016/j.apcatb.2021.120362
摘要
The identification of active sites and the establishment of structure-reactivity relationship at atomic scale is important for designing efficient catalysts and understanding the reaction mechanism. Here, single atom catalysts (SACs) of Fe anchored on g-C3N4 were synthesized. The catalysts have larger surface area, more photo-generated electrons with stronger reduction ability and faster charge carrier migration than g-C3N4, thereby exhibited dramatically enhanced activity and stability in electron reduction of ozone (O3) under visible light. However, lower catalytic performance was observed when Fe nanoparticles coexisted, which regulated more photoelectrons to reduce O2 to OH via two or three-electron reduction pathways rather than one-electron reduction of O3. Mössbauer spectrum and X-ray adsorption spectroscopy indicated that the presence of Fe nanoparticles led to higher proportion of Fe(II)Nx, which played more significant role in the adsorption and reduction of O2. The insight on the contribution of different Fe sites with well-defined local coordination structure is beneficial for rational design of efficient catalysts in photocatalytic ozonation.
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