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https://hdl.handle.net/2440/136584
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Type: | Journal article |
Title: | Manipulation of n → π* electronic transitions via implanting thiophene rings into two-dimensional carbon nitride nanosheets for efficient photocatalytic water purification |
Other Titles: | Manipulation of n -> pi* electronic transitions via implanting thiophene rings into two-dimensional carbon nitride nanosheets for efficient photocatalytic water purification |
Author: | He, F. Liu, X. Zhao, X. Zhang, J. Dong, P. Zhang, Y. Zhao, C. Sun, H. Duan, X. Wang, S. Wang, S. |
Citation: | Journal of Materials Chemistry A, 2022; 10(38):20559-20570 |
Publisher: | Royal Society of Chemistry |
Issue Date: | 2022 |
ISSN: | 2050-7488 2050-7496 |
Statement of Responsibility: | Fengting He, Xiaoming Liu, Xiaoli Zhao, Jinqiang Zhang, Pei Dong, Yang Zhang, Chaocheng Zhao, Hongqi Sun, Xiaoguang Duan, Shaobin Wang and Shuaijun Wang |
Abstract: | The photocatalytic performance of polymeric carbon nitride (C3N4) is heavily restricted by insufficient n → π* electronic transitions and limited active sites. To this end, we adopted an integrated copolymerization and repyrolysis approach to fabricate two-dimensional thiophene ring implanted (C3N4) nanosheets (2D Thing-CNNS). Advanced characterization studies demonstrated that the fusion of thiophene rings and the formation of 2D nanosheets significantly collectively elevated the n → π* electronic transitions and enlarged the specific surface areas of 2D Thing-CNNS, leading to a dramatically extended π-conjugated system and accelerated charge migration. Transmission electron microscopy, X-ray diffraction, and solid-state 13C NMR proved the existence of the thiophene ring. Additionally, quantum computations of the highest occupied and lowest unoccupied crystal orbitals implied that the 2D Thing-CNNS are more favorable for carrier migration than pristine (C3N4). The finite element method (FEM) analysis indicates that 2D Thing-CNNS have a stronger surface electric field and radiation absorption, which is consistent with the enhanced n → π* transition. Consequently, 2D Thing-CNNS exhibit a 42.7-fold enhancement in photocatalytic performances for bisphenol A oxidation accordingly, compared with pristine C3N4. This work provides a novel strategy for engineering the electronic structure of C3N4 for highly efficient water purification. |
Rights: | This journal is © The Royal Society of Chemistry 2022 |
DOI: | 10.1039/d2ta04975a |
Grant ID: | http://purl.org/au-research/grants/arc/DE210100253 |
Published version: | http://dx.doi.org/10.1039/d2ta04975a |
Appears in Collections: | Chemical Engineering publications |
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