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Type: Journal article
Title: Unzipping carbon nanotubes to nanoribbons for revealing the mechanism of nonradical oxidation by carbocatalysis
Author: Yang, Q.
Chen, Y.
Duan, X.
Zhou, S.
Niu, Y.
Sun, H.
Zhi, L.
wang, S.
Citation: Applied Catalysis B: Environmental, 2020; 276:119146-1-119146-10
Publisher: Elsevier
Issue Date: 2020
ISSN: 0926-3373
Statement of
Qi Yang, Yidi Chen, Xiaoguang Duan, Shanke Zhou, Yue Niu, Hongqi Sun, Linjie Zhi, Shaobin Wang
Abstract: Graphitic multi-walled carbon nanotubes (MWCNTs) are controllably unzipped into edge-rich graphene nanoribbons to reveal the roles of edges and defects in persulfate activation for bisphenol A (BPA) oxidation. Enriched carbon edges remarkably enhance the catalytic performance and can serve as hosting sites for heteroatom (N, S) doping to promote carbocatalysis. A sample (NS-2) presented a complete BPA removal in 20 min at a rate constant of 0.182 min⁻¹. The rate constants were relating to the defect speciation in a negative correlation to an indicator (ID/ID’) from Raman spectra. Excessive edges induce defects and structure transformation of sp² to sp³, resulting in deterioration of the organic oxidation. Furthermore, unzipped MWCNTs were clarified to follow a nonradical electron transfer pathway by radical screening tests, in situ Raman and electrochemical characterizations. The unveiled mechanism emphasizes the importance of an essential graphitic degree and conductivity in the edge-enriched carbocatalysts for better catalytic performance.
Keywords: Carbon edge; defect; carbocatalysis; persulfate activation; nonradical pathway
Rights: © 2020 Elsevier B.V. All rights reserved.
DOI: 10.1016/j.apcatb.2020.119146
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Chemical Engineering publications

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