首页|Plasma-exfoliated g-C3N4 with oxygen doping:tailoring photocatalytic properties
Plasma-exfoliated g-C3N4 with oxygen doping:tailoring photocatalytic properties
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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.
National Engineering Research Centre of Industry Crystallization Technology,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China
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