Removal of atmospheric NO and NO2 over g-C3N4-based heterojunction photocatalyst under visible LED light irradiation /

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Student Theses

2022

Qin, Xing

Hong Kong : The Education University of Hong Kong

Thesis

The excessive emissions of nitrogen oxides (NOx) in the atmosphere have caused various environmental and health problems worldwide for decades. Compared with the traditional methods, photocatalytic technology has recently been considered more effective, practical, and environmental-friendly for atmospheric NOx removal. However, massive photocatalysts are prepared and designed for NO removal only, even NO and NO2 always coexist in the environment and NO2 is several times higher toxic than NO. On the other hand, photocatalytic oxidation still has great limitations for real application because of the inevitable generation of adverse NO2, nitrite, or nitrate. This thesis revealed that constructing the Z-scheme heterojunction photocatalysts among metallic oxides and g-C3N4 could significantly improve photocatalytic performance for NO, NO2, and NO+NO2 abatement under visible LED light irradiation. Thereinto, one photocatalytic reduction pathway of NO was confirmed over β-Bi2O3/Bi/g-C3N4 photocatalyst thanks to the Z-scheme that could generate electrons with strong reduction ability. The similarity, difference, and coactions between NO and NO2 during the photocatalytic reaction were comprehensively investigated over CeO2/g-C3N4 and NiO/gC3N4 photocatalysts. This thesis has provided a new route for regulating the photocatalytic reaction pathway for NO removal through a simple synthesis method, and has also innovatively proposed a potential mechanism for simultaneous photocatalytic removal of atmospheric NO and NO2 driven by visible LED light

LG51.H43 Dr 2022eb Qinx

https://educoll.lib.eduhk.hk/records/KAJpz9h3