Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 52, Issue 15, Pages 8659-8665Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.8b01849
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Funding
- National Key Research and Development Program of China [2016YFA0203000]
- National Natural Science Funds for Distinguished Young Scholars [21425728]
- National Science Foundation of China [21477044, 51472100]
- 111 Project [B17019]
- Self-Determined Research Funds of CCNU from the Colleges' Basic Research and Operation of MOE [CCNU16A02029]
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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 O-2 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 (center dot O-2) in a side-on bridging mode under ambient condition, which thermodynamically suppressed the terminal end-on center dot O-2(-) 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 NOx removal systems.
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