期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 23, 页码 20770-20777出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b02767
关键词
photosensitization; carbon nitride; Pt2+ doping; metal-to-ligand charge transfer; heavy atom effect; antibiotics
资金
- National Natural Science Foundation of China [21522505]
- Youth Science Foundation of Sichuan Province [2016JQ0019]
Herein, taking graphite carbon nitride (g-C3N4) as the example, we demonstrated that the two limiting factors that determine the photosensitization performance, namely, light absorption and intersystem crossing (ISC), could be simultaneously enhanced through Pt2+ doping. Specifically, as a pi-conjugated two-dimensional semiconductor, g-C3N4 is capable of absorbing light shorter than 460 nm (2.7 eV). Upon Pt2+ doping that allows metal-to-ligand charge transfer (MLCT) from Pt2+ to the substrate g-C3N4, the light absorption of g-C3N4 was greatly expanded up to 1000 nm. Meanwhile, the large atomic number of Pt2+ ensures promotion of ISC to activate the triplet state of g-C3N4 via heavy atom effect (HAE), which was confirmed via both photosensitization performance and photophysical characterizations. Further, the enhanced light absorption and photosensitization of Pt2+-doped g-C3N4 were harvested antibiotics removal, a type of environment contaminants that gained global attention because of their worldwide abuse. Compared with its undoped counterpart, Pt2+-doped g-C3N4 featured significantly improved antibiotics removal in the presence of low-power white LED irradiation, which is promising for photosensitized environmental remediation.
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