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Type: Journal article
Title: Sulfur and nitrogen co-doped graphene for metal-free catalytic oxidation reactions
Author: Duan, X.
O'Donnell, K.
Sun, H.
Wang, Y.
Wang, S.
Citation: Small, 2015; 11(25):3036-3044
Publisher: Wiley-VCH Verlag
Issue Date: 2015
ISSN: 1613-6810
Statement of
Xiaoguang Duan, Kane O'Donnell, Hongqi Sun, Yuxian Wang, and Shaobin Wang
Abstract: Sulfur and nitrogen co-doped reduced graphene oxide (rGO) is synthesized by a facile method and demonstrated remarkably enhanced activities in metal-free activation of peroxymonosulfate (PMS) for catalytic oxidation of phenol. Based on first-order kinetic model, S-N co-doped rGO (SNG) presents an apparent reaction rate constant of 0.043 ± 0.002 min(-1) , which is 86.6, 22.8, 19.7, and 4.5-fold as high as that over graphene oxide (GO), rGO, S-doped rGO (S-rGO), and N-doped rGO (N-rGO), respectively. A variety of characterization techniques and density functional theory calculations are employed to investigate the synergistic effect of sulfur and nitrogen co-doping. Co-doping of rGO at an optimal sulfur loading can effectively break the inertness of carbon systems, activate the sp(2) -hybridized carbon lattice and facilitate the electron transfer from covalent graphene sheets for PMS activation. Moreover, both electron paramagnetic resonance (EPR) spectroscopy and classical quenching tests are employed to investigate the generation and evolution of reactive radicals on the SNG sample for phenol catalytic oxidation. This study presents a novel metal-free catalyst for green remediation of organic pollutants in water.
Keywords: metal-free catalysis
Description: Published online: March 18, 2015
Rights: © 2015 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
DOI: 10.1002/smll.201403715
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Chemical Engineering publications

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