Plasma-exfoliated g-C3N4 with oxygen doping: tailoring photocatalytic properties
Yuxin Li , Junxin Guo , Rui Han , Zhao Wang
Front. Chem. Sci. Eng. ›› 2024, Vol. 18 ›› Issue (2) : 15
Plasma-exfoliated g-C3N4 with oxygen doping: tailoring photocatalytic properties
Heteroatom doping and defect engineering have been proposed as effective ways to modulate the energy band structure and improve the photocatalytic activity of g-C3N4. In this work, ultrathin defective g-C3N4 was successfully prepared using cold plasma. Plasma exfoliation reduces the thickness of g-C3N4 from 10 nm to 3 nm, while simultaneously introducing a large number of nitrogen defects and oxygen atoms into g-C3N4. The amount of doped O was regulated by varying the time and power of the plasma treatment. Due to N vacancies, O atoms formed strong bonds with C atoms, resulting in O doping in g-C3N4. The mechanism of plasma treatment involves oxygen etching and gas expansion. Photocatalytic experiments demonstrated that appropriate amount of O doping improved the photocatalytic degradation of rhodamine B compared with pure g-C3N4. The introduction of O optimized the energy band structure and photoelectric properties of g-C3N4. Active species trapping experiments revealed ·O2– as the main active species during the degradation.
graphitic carbon nitride / cold plasma / oxygen doping / nitrogen defect / visible-light photocatalysis
Higher Education Press
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