عنوان مجله
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APPLIED CATALYSIS B-ENVIRONMENTAL
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کلیدواژهها
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Photocatalysis, Humidity, Bi/BiOBr nanoflowers,Oxygen vacancies, NO removal
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چکیده
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Water vapor (relative humidity) is an ineluctable factor for photocatalytic removal of low-concentration NO in
practical environment. In this work, defective Bi/BiOBr nanoflowers were synthesized by a solvothermal
approach. Benefiting from bismuth and oxygen vacancies, the efficiency of photocatalytic NO removal increased
from the initial 26 % to 63 % when exposed to visible light. Furthermore, photocatalytic NO removal performance at various relative humidity levels was explored. It was found that the NO removal efficiency was
negligibly affected by humidity. However, the generation of toxic NO2 intermediate was reduced progressively
from 87 to 29 ppb as the humidity increased from 5 % to 100 %, which may be attributed to the high hydrophilicity of NO2. The NO-TPD and in-situ DRIFTS were further employed to unveil the pathway of adsorption and
photocatalytic removal of NO. This study discloses a strategy for effectively removing NO from the atmosphere
by reducing emission of harmful intermediate NO2.
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