单线态氧
过氧化氢
化学
激进的
催化作用
分解
光化学
原子氧
单重态
密度泛函理论
氧气
计算化学
有机化学
原子物理学
物理
激发态
作者
Xixi Chen,Wanyi Fu,Yulong Yang,Yanjun Li,Kai Yang,Xuanbo Xu,Xihui Zhang
标识
DOI:10.1016/j.jece.2023.109442
摘要
Atomic H* has been reported to be thermodynamically feasible for activating hydrogen peroxide (H2O2) to produce radicals, while the nonradical pathway and the contributions of metal sites and atomic H* in H2O2 activation need further exploration. In this study, a TiO2 @MnO2 catalyst was synthesized via a facile hydrothermal method and surprisingly found to produce atomic H* over Mn sites in water without external energy input (e.g., light and electricity). Atomic H* plays an essential role in the activation of H2O2 via a nonradical pathway, which induces the removal of tiamulin up to 80.4–91.7% in 20 min at a wide pH range of 4.0–11.0. Density function theory calculations prove that atomic H* owns a much lower total energy barrier (ΔGtotal = 0.68 eV) for the decomposition of H2O2 to generate superoxide and singlet oxygen than Mn sites (ΔGtotal = 2.90 eV). This study is a re-visit to the mechanism of activating H2O2 via atomic H* for efficient degradation of emerging organic contaminants.
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