氧气
活性氧
分子
X射线光电子能谱
降级(电信)
活动站点
活化能
分子氧
环境修复
化学
热液循环
化学物理
纳米技术
催化作用
材料科学
光化学
化学工程
物理化学
计算机科学
污染
有机化学
工程类
生物
电信
生态学
作者
Chuanjian Su,Chaolin Li,Ruhong Li,Wenhui Wang
标识
DOI:10.1016/j.cej.2022.139300
摘要
Piezocatalytic molecular oxygen activation has been regarded as a promising and low energy-cost strategy for environment remediation, yet the piezocatalytic activity is still far from satisfactory and little is known on its activation mechanism, which greatly hinders its further development. Herein, the piezocatalyst Bi2Fe4O9 nanosheets (BFO NSs) are synthesized via a facile hydrothermal method, which exhibit excellent piezocatalytic performance for sulfamethoxazole degradation. O2∙- generated via the molecular oxygen reduction reaction by piezo-electrons and the piezo-holes were confirmed as major active species for organic pollutants degradation. Further theoretical calculations and XPS analyses confirm the Fe2+ sites as active centers activate molecular oxygen into O2∙- via donating the electrons to molecular oxygen and the piezo-electrons reduce Fe3+ to Fe2+. This work provides atomic-scale insights into the active sites of piezocatalytic molecular oxygen activation, which can inspire the development of more efficient piezocatalysts for environment application.
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