Oxygen Vacancies Mediated Complete Visible Light NO Oxidation via Side-On Bridging Superoxide Radicals,Environmental Science & Technology

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Oxygen Vacancies Mediated Complete Visible Light NO Oxidation via Side-On Bridging Superoxide Radicals
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2018-07-17 , DOI: 10.1021/acs.est.8b01849
Hao Li ₁ , Huan Shang ₁ , Xuemei Cao ₁ , Zhiping Yang ₁ , Zhihui Ai ₁ , Lizhi Zhang ₁

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It is of a great challenge to seek for semiconductor photocatalysts with prominent reactivity to remove kinetically inert dilute NO without NO₂ emission. In this study, complete visible light NO oxidation mediated by O₂ is achieved over a defect-engineered BiOCl with selectivity exceeding 99%. Well-designed oxygen vacancies on the prototypical (001) surface of BiOCl favored the possible formation of geometric-favorable superoxide radicals (•O₂^–) in a side-on bridging mode under ambient condition, which thermodynamically suppressed the terminal end-on •O₂^– associated NO₂ emission in case of higher temperatures, and thus selectively oxidized NO to nitrate. These findings can help us to understand the intriguing surface chemistry of photocatalytic NO oxidation and design highly efficient NO_x removal systems.

中文翻译：

氧空位通过侧桥超氧化物自由基介导的完全可见光NO氧化

寻找具有显着反应性的半导体光催化剂以去除没有NO ₂排放的动力学惰性的稀NO是一个巨大的挑战。在这项研究中，由O ₂介导的可见光NO的完全氧化是在缺陷工程化的BiOCl上实现的，其选择性超过99％。在BiOCl的原型（001）表面上设计良好的氧空位有利于在环境条件下以侧对桥方式形成几何有利的超氧自由基（•O ₂^–），从而热力学上抑制了末端末端• O ₂^–相关的NO ₂在较高温度的情况下会排放，从而将NO选择性氧化为硝酸盐。这些发现可以帮助我们理解光催化NO氧化的有趣表面化学，并设计出高效的NO _X去除系统。

更新日期：2018-07-18

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