Unzipping carbon nanotubes to nanoribbons for revealing the mechanism of nonradical oxidation by carbocatalysis

Document Type

Journal Article

Publication Title

Applied Catalysis B: Environmental

Publisher

Elsevier B.V.

School

School of Engineering

RAS ID

32887

Comments

Yang, Q., Chen, Y., Duan, X., Zhou, S., Niu, Y., Sun, H., ... & Wang, S. (2020). Unzipping carbon nanotubes to nanoribbons for revealing the mechanism of nonradical oxidation by carbocatalysis. Applied Catalysis B: Environmental, 276, Article 119146. https://doi.org/10.1016/j.apcatb.2020.119146

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. © 2020 Elsevier B.V.

DOI

10.1016/j.apcatb.2020.119146

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