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Type: Journal article
Title: N-doped graphene from metal-organic frameworks for catalytic oxidation of p-hydroxylbenzoic acid: N-functionality and mechanism
Author: Liang, P.
Zhang, C.
Duan, X.
Sun, H.
Liu, S.
Tade, M.
Wang, S.
Citation: ACS Sustainable Chemistry and Engineering, 2017; 5(3):2693-2701
Publisher: American Chemical Society
Issue Date: 2017
ISSN: 2168-0485
Statement of
Ping Liang, Chi Zhang, Xiaoguang Duan, Hongqi Sun, Shaomin Liu, Moses O. Tade, and Shaobin Wang
Abstract: N-doped graphene has been considered as a promising catalyst with surface metal-free active sites for environmental remediation. Several MIL-100 (Fe)-templated N-doped graphene samples were synthesized using dicyandiamide, melamine, and urea as the nitrogen precursors. Excellent catalytic oxidation of p-hydroxylbenzoic acid (PHBA) was observed on the as-synthesized samples via peroxymonosulfate (PMS) activation. The mechanism was investigated by both electron paramagnetic resonance (EPR, 5,5- dimethyl-1-pyrroline N-oxide and 2,2,6,6-tetramethyl-4-piperidinol as the trapping agents) and quenching tests (ethanol and sodium azide as the radical scavengers). Benzoic acid and furfuryl alcohol were also employed as probing reagents for hydroxyl/sulfate radicals and singlet oxygen, respectively. The results confirmed that singlet oxygen was generated and dominated the PHBA degradation on N-doped graphene, rather than hydroxyl/sulfate radicals. With the novel N-doped graphene, this study illustrates the formation mechanism of nitrogen functionalities for reactive radicals via PMS activation for removal of organic contaminants in water.
Keywords: MIL-100 (Fe); N-doped graphene; environmental catalysis; singlet oxygen; peroxymonosulfate activation
Description: Published: February 13, 2017
Rights: © 2017 American Chemical Society
RMID: 0030095298
DOI: 10.1021/acssuschemeng.6b03035
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Appears in Collections:Chemical Engineering publications

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