期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 260, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118145
关键词
Defect-based interface; Thermal defect; Z-scheme; Photocatalyst; Carbon nitride
资金
- National Natural Science Foundation of China - Priority Academic Program Development of Jiangsu Higher Education Institutions [21375116]
- Jiangsu Province research program on analytical methods and techniques on the shared platform of large scale instruments and equipment [BZ 201409]
In designing of carbon nitride-based Z-scheme systems, band structure engineering of graphitic carbon nitride (g-C3N4) is unquestionably a crucial demand but paid rare attention to. Here, the broadened light absorption and charge transfer on sub gaps induced by thermal defects in defect-rich carbon nitride (d-C3N4) are simultaneously utilized to engineer a novel and more efficient Z-scheme system. The as-prepared alpha-Fe2O3/d-C3N4-1 exhibits dramatically improved photocatalytic degradation rate for tetracycline compared with alpha-Fe2O3/g-C3N4-1 under visible light. Dye photosensitization effect on photocatalytic reaction was ruled out, and the tetracycline decomposition mechanism was proposed. The efficiently restrained charge recombination and broadened light absorption in this Z-scheme system are key parameters of the outstanding photocatalytic activity. This proposed mechanism has the potential to push the limit of traditional carbon-nitride-based Z-scheme photocatalysts and can also shed substantial light on the engineering strategies for other polymeric Z-scheme photocatalysts.
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