4.7 Article

Construction of visible light driven silver sulfide/graphitic carbon nitride p-n heterojunction for improving photocatalytic disinfection

Journal

CHEMOSPHERE
Volume 283, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.131167

Keywords

p-n heterojunction; Ag2S/g-C3N4; Photocatalysis; Disinfection; Active species

Funding

  1. National Natural Science Foundations of China [21765002, 22064004]
  2. Guangxi Natural Science Foundation of China [2017GXNSFDA198044, 2019GXNSFAA245014]
  3. BAGUI Scholar Program

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A Ag2S/g-C3N4 heterojunction was successfully synthesized and showed outstanding photocatalytic inactivation of bacteria under visible light irradiation, highlighting the significant value of p-n type heterojunctions in photocatalysis.
Compared with the Z-scheme and type-II heterojunctions, p-n type heterojunctions are more favorable for the migration of photo-induced carriers owing to the advantage of built-in electric fields. In addition, it is still of great significance to understand the carrier migration properties of the p-n heterojunction. Therefore, the development of new p-n heterojunctions and the development of high-efficiency catalysts with effective modulation of light responsiveness and rapid transfer of charge to achieve photocatalytic inactivation have attracted much attention. In this study, we synthesized a Ag2S/g-C3N4 heterojunction via the in situ deposition of Ag2S onto the g-C3N4 substrate. The prepared Ag2S/g-C3N4 composite facilitated photo-generated charge carrier transfer and exhibited outstanding photocatalytic inactivation of bacteria compared to that of a single catalyst under visible light irradiation. In addition, the ACN-2 composites fully deactivated 7 log10 CFU/mL E. coli and 7 log10 CFU/mL S. aureus cells in 90 min under visible light. The quenching experiments confirmed that photo-generated active species (O-center dot(2)-, (OH)-O-center dot, and h(+)) were the major reactive oxygen species that contributed to the inactivation of bacteria. Energy band alignment analysis indicated that a type-II band alignment was formed in the p-n heterostructure, thereby providing strong support for the photocatalytic mechanism. This study not only provides insights into the design of p-n heterostructures, but also presents a promising strategy to enhance the photocatalytic capacities of g-C3N4 based materials for pathogen inactivation.

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