催化作用
化学
电子转移
锰
臭氧
激进的
氧化还原
金属
光化学
羟基自由基
无机化学
键裂
氧化物
浸出(土壤学)
有机化学
环境科学
土壤科学
土壤水分
作者
Da Wang,Yinning He,Yi Chen,Fan Yang,Zhiqiao He,Tao Zeng,Xiaohui Lu,Lizhang Wang,Shuang Song,Jun Ma
出处
期刊:Water Research
[Elsevier]
日期:2023-02-01
卷期号:230: 119574-119574
被引量:33
标识
DOI:10.1016/j.watres.2023.119574
摘要
In this study, manganese oxide (MnO) dispersed on CN (Mn-nCN) was fabricated as a catalyst in heterogeneous catalytic ozonation (HCO), achieving excellent catalytic performance on refractory organic pollutant degradation via the synergistic effects between MnO and CN. The study demonstrated that the C-N-Mn and C-O-Mn bonds constructed in the catalyst linking MnO and CN created the synergistic effects which could overcome typical problems, such as metal leaching etc. The C-N-Mn and C-O-Mn bonds could promote electron transfer from cation-π reactions to form electron-rich Mn(II) sites and electron-poor CN sites. The electron-rich Mn(II) sites as active sites supplied electrons to ozone which then further evolved into reactive oxygen species (ROS). The electron-poor CN sites captured electrons from the pollutant intermediate radicals to electron-rich Mn(II) sites via cation-π reactions with the help of C-N-Mn and C-O-Mn bonds, which promote the redox reactions of Mn. The surface hydroxyl groups also participated in ozone decomposition and ROS production. Additionally, •OH was the dominant ROS of the Mn-nCN HCO processes. This study presents the excellent HCO performance of Mn-nCN, as well as provides views on the electron transfer route between the catalyst, pollutant and ozone, which is crucial for the design of the catalyst.
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