Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/113676
Citations | ||
Scopus | Web of Science® | Altmetric |
---|---|---|
?
|
?
|
Type: | Journal article |
Title: | Facile synthesis of nitrogen-doped graphene via low-temperature pyrolysis: The effects of precursors and annealing ambience on metal-free catalytic oxidation |
Author: | Li, D. Duan, X. Sun, H. Kang, J. Zhang, H. Tade, M. Wang, S. |
Citation: | Carbon, 2017; 115:649-658 |
Publisher: | Elsevier |
Issue Date: | 2017 |
ISSN: | 0008-6223 1873-3891 |
Statement of Responsibility: | Degang Li, Xiaoguang Duan, Hongqi Sun, Jian Kang, Huayang Zhang, Moses O. Tade, Shaobin Wang |
Abstract: | A green and facile protocol of thermal treatment of graphene oxide (GO) with urea was adopted to synthesize nitrogen-doped graphene (NG-Urea-air) at a low temperature (350 °C) in the static air. The resulting sample exhibited outstanding catalytic performance to activate peroxymonosulfate (PMS) toward organic degradation. The NG-Urea-air induced 49.7- and 11.5-fold enhancement over GO and pristine reduced graphene oxide (rGO-air). Moreover, the influences of nitrogen precursors including organic chemicals (urea, cyanamide, and melamine) and inorganic salts (ammonium nitrate and ammonium chloride) were investigated, and urea was demonstrated to be the best precursor for synthesizing N-doped graphene with a relative high doping level (18.7 at.%). The classical radical quenching and advanced in situ electron paramagnetic resonance (EPR) technology revealed that the outstanding oxidative effectiveness of PMS/NG-Urea-air system was originated from the nonradical oxidation pathway, in which PMS was activated by the positively charged carbon domains next to nitrogen atoms and the phenol was oxidized simultaneously on the carbon network via rapid charge transfer. Meanwhile, singlet oxygen and radicals may also partially contribute to the complete phenol degradation. This study facilitates a fundamental investigation of heteroatom doping progress during thermal treatment and sheds light on the insights into carbocatalysis in environmental remediation. |
Keywords: | Catalytic oxidation; nitrogen-doped graphene; precursors; singlet oxygen; peroxymonosulfate |
Description: | Available online 20 January 2017 |
Rights: | © 2017 Elsevier Ltd. All rights reserved. |
DOI: | 10.1016/j.carbon.2017.01.058 |
Grant ID: | http://purl.org/au-research/grants/arc/DP150103026 |
Published version: | http://dx.doi.org/10.1016/j.carbon.2017.01.058 |
Appears in Collections: | Aurora harvest 8 Chemical Engineering publications |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.