Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 21, Pages 24907-24915Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c05162
Keywords
triazoie; g-C3N5; phosphorus; photocatalysis; photoelectrochernistly
Funding
- Ministry of Science and Technology, Taiwan [MOST 107-2221-E-011-156-MY3, 108-2221-E-011-165-MY3, 2020G654, 2019G674]
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Phosphorus-doped g-C3N5 was successfully prepared and showed improved PEC and photocatalytic performance compared to undoped g-C3N5, although excessive phosphorus doping decreased efficiency. Phosphorus-doped g-C3N5 holds great promise for applications in environmental remediation.
Triazole-based g-C3N5, a potential catalyst, has received little attention over the years. We prepared phosphorus-doped g-C3N5 with one triazole and two triazine units for the first time to investigate its photoelectrochemical (PEC) and photocatalytic properties. The doping states and crystalline structures of the samples were determined using X-ray techniques, namely, X-ray diffraction, X-ray photoelectron spectroscopy, and X-ray absorption fine structure analysis. Our results suggested that the phosphorus was substituted into carbon sites form P-N/P=N bonds with four coordination, which contribute P 2p level donor states in the band gap to enhance light absorption and reduce charge separation. Therefore, P-doped g-C3N5 exhibited higher PEC current density and better photocatalytic efficiency toward the degradation of rhodamine B dye or tetracycline under light irradiation compared to the undoped g-C3N5 sample. However, excess phosphorus doping resulted in the formation of impurities and disrupted the triazine and triazole units, reducing the PEC and photocatalytic efficiency. In summary, P-doped g-C3N5 was successfully prepared in the present study and represents a promising, facile, and effective catalyst for energy applications and environmental remediation.
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