期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 281, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119539
关键词
g-C3N4; sulfur doping; Band structure regulation; Charge separation; Surface charge transfer
资金
- National Natural Science Foundation of China [51579096, 51521006, 51909089]
- Funds for Innovative Province Construction of Hunan Province [2019RS3012]
- Key Research and Development Program of Hunan Province of China
- National Innovative Talent Promotion Program of China [2017SK2241]
- National Program for Support of Top-Notch Young Professionals of China [2017RA2088]
Sulfur doping can regulate the band structure of g-C3N4, enhance its optical absorption ability, introduce new absorption bands, and create local electron accumulation points, thereby improving charge separation efficiency and surface charge transfer ability.
Exfoliating g-C3N4 into 2D nanosheet to minimize the stacking layer for the improvement of charge transfer and separation is considered to be the effective measure to enhance its photocatalytic performance. However, no matter what method is used, the exfoliated g-C3N4 nanosheet shows decreased optical absorption compared to the pristine bulk-like one. In this work, a simple one-step sulfur doping method is proposed on the basis of exfoliated g-C3N4 nanosheet, which can directly regulate the band structure of g-C3N4 and enhance its optical absorption ability. The proposed sulfur doping method redshift the light absorption edge of g-C3N4 nanosheet to the level of pristine bulk-like g-C3N4, and even induce the generation of a new n ->pi* absorption band. In addition, the introduced sulfur doping site can form a local electron accumulation point, so that to further improve the charge separation efficiency and surface charge transfer ability of g-C3N4 nanosheets.
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