纳米团簇
催化作用
X射线光电子能谱
X射线吸收精细结构
氧烷
原位
价(化学)
钛
材料科学
无定形固体
氧化钛
氧化物
化学工程
光化学
无机化学
纳米技术
化学
光谱学
结晶学
有机化学
冶金
工程类
物理
量子力学
作者
Yue Jiang,Didar Baimanov,Shan Jin,Japhet Cheuk-Fung Law,Pengcheng Zhao,Juanjuan Tang,Jian Peng,Liming Wang,Kelvin Sze-Yin Leung,Wenchao Sheng,Sijie Lin
标识
DOI:10.1073/pnas.2210211120
摘要
Controllable in situ formation of nanoclusters with discrete active sites is highly desirable in heterogeneous catalysis. Herein, a titanium oxide-based Fenton-like catalyst is constructed using exfoliated Ti3C2 MXene as a template. Theoretical calculations reveal that a redox reaction between the surface Ti-deficit vacancies of the exfoliated Ti3C2 MXene and H2O2 molecules facilitates the in situ conversion of surface defects into titanium oxide nanoclusters anchoring on amorphous carbon (TiOx@C). The presence of mixed-valence Tiδ+ (δ = 0, 2, 3, and 4) within TiOx@C is confirmed by X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS) characterizations. The abundant surface defects within TiOx@C effectively promote the generation of reactive oxygen species (ROS) leading to superior and stable Fenton-like catalytic degradation of atrazine, a typical agricultural herbicide. Such an in situ construction of Fenton-like catalysts through defect engineering also applies to other MXene family materials, such as V2C and Nb2C.
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