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https://irlib.pccu.edu.tw/handle/987654321/48697
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| Title: | Origin of the enhanced photocatalytic activity of graphitic carbon nitride nanocomposites and the effects of water constituents |
| Authors: | Zhong, CR (Zhong, Chang-Ru)
Lee, TW (Lee, Ting-Wei)
Li, JA (Li, Jie-An)
Lai, YH (Lai, Yu-Heng)
Ha, TJ (Ha, Tae-Jun)
Chen, CY (Chen, Chiaying) |
| Contributors: | 化學系 |
| Keywords: | Natural organic matter
Humic acid
Cyclooctasulfur
Band alignment
Tetracycline |
| Date: | 2020-10-15 |
| Issue Date: | 2020-10-22 14:21:20 (UTC+8) |
| Abstract: | A metal-free heterostructure system composed of graphitic carbon nitride (g-C3N4), reduced graphene oxide (rGO), and cyclooctasulfur (alpha-S) is developed as a facile route for establishing efficient photo catalysts. We aim to identify the governing factors that contributed to the photochemical performance of g-C3N4/rGO/alpha-S nanocomposites, which are important to advance potential applications but remain unexplored. The results indicate that the constituent ratio of each component in g-C3N4/rGO/alpha-S composites leads to varying surface microstructure, band alignment, and photochemical properties. The enhanced visible-light photocatalytic activity originates from an upward shift of the conduction bands toward higher energies, higher content of sp(2)-hybridized pyridine nitrogen in triazine rings (C=N-C), and a lower amount of hydrogen bonds. The established structural integration informs a guiding framework for the design of emerging g-C3N4-based nanocomposites. Additionally, the influence of humic acid (HA) on photocatalytic decontamination was studied and shows an overall detrimental effect on the photocatalytic activity of g-C3N4 nanocomposites. Although HA advanced the photoexcited electrons, and therefore the reactive oxygen species, as well as enhanced the adsorption of the pollutants onto g-C3N4, especially at lower pH, attenuation of oxygen transfer as a result of active site competition between oxygen and target pollutants was found. (C) 2020 Elsevier Ltd. All rights reserved. |
| Relation: | CARBON 卷冊: 167 頁數: 852-862 |
| Appears in Collections: | [Department of Chemistry & Graduate Institute of Applied Chemistry ] journal articles
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