Journal
CHEMOSPHERE
Volume 312, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.137145
Keywords
N -Self -doped; Quantum confinement effects; Graphitic carbon nitride; Reactive oxygen species; DFT calculation
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A nitrogen self-doped hollow nanotubes g-C3N4 (N-PCN) was synthesized and exhibited excellent efficiency in the photocatalytic degradation of TC by reducing oxygen to superoxide radicals. The N-PCN also suppressed the recombination of photogenerated charge carriers and facilitated the adsorption of oxygen molecules, resulting in the generation of more superoxide radicals and singlet oxygen through the oxygen activation process.
The rapid recombination of photogenerated electrons and holes, low utilization of visible light and weak oxidation capacity significantly limit the photocatalytic activity for the degradation of organic pollutants. Doping is used as a conventional strategy for regulating the electronic structure of photocatalysts to obtain a wider light absorption, but also suffers from the problems of reduced charge mobility and oxidation capacity, which is not conducive to photocatalytic degradation of pollutants. To address this issue, a nitrogen self-doped hollow nanotubes g-C3N4 (N-PCN) was synthesized by synergistic self-doping and quantum confinement effects. The N-PCN exhibits excellent efficiency in photocatalytic degradation of TC compared to the pristine g-C3N4. The synthesized N-PCN has a more positive conduction band minimum and can generate more photogenerated electrons to reduce oxygen to superoxide radicals. In addition, experimental and theoretical evidence shows that N-self-doping not only sup-presses the recombination of photogenerated charge carriers but also facilitates the adsorption of oxygen molecules. Consequently, more superoxide radicals and singlet oxygen are generated through oxygen activation process.
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