Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 436, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2022.129271
Keywords
Bi2O2[BO2(OH)]; Bi metal; Oxygen vacancies; Charge transfer; Photocatalytic NO oxidation
Categories
Funding
- National Natural Science Foundation of China [22176029, 21822601, 51908091]
- Natural Science Foundation of Chongqing [cstc2019jcyj-msxmX0213]
- Science and Technology Research Project of Chongqing Education Commission [KJQN201900807]
- Start-up Foundation of High-level Talents in Chongqing Technology and Business University [1856044]
- Innovative Research Projects for Postgraduates of Chongqing Technology and Business University [CYS21400]
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This study presents a catalyst design for the photocatalytic oxidation of NO under visible light, using Bi-metal@ Bi2O2[BO2(OH)] catalyst with oxygen vacancies (OVs). The study reveals the key mechanisms of improved charge separation efficiency and active oxygen species generation, along with the unique electron transfer covalent loop. The catalyst also serves as an electron donor to activate NO molecules and achieve the harmless conversion of NO.
Photocatalysis technology prevails as a feasible option for air pollution control, in which high-efficiency charge separation and effective pollutant activation are the crucial issues. Here, this work designed Bi-metal@ Bi2O2[BO2(OH)] with oxygen vacancies (OVs) catalyst for photocatalytic oxidation of NO under visible light, to shed light on the above two processes. Experimental characterizations and density functional theory (DFT) calculations reveal that a unique electron transfer covalent loop([Bi2O2](2+) -> Bi-metal -> O-2(-))can be formed during the reaction to guide the directional transfer of carriers, significantly improving the charge separation efficiency and the yield of active oxygen species. Simultaneously, the defect levels served by OVs also play a part. During the NO purification process, in-situ DRIFTS assisted with DFT calculations reveal that Bi metals could be functioned as electron donors to activate NO molecules and form NO-, a key intermediate. This induces a new reaction path of NO -> NO- -> NO3- to achieve the harmless conversion of NO, effectively restraining the generation of noxious intermediates (NO2, N2O4). It is expected that this study would inspire the design of more artful photocatalysts for effective charge transfer and safe pollutants purification.
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