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

Qi Yang, Yidi Chen, Xiaoguang Duan, Shanke Zhou, Yue Niu, Hongqi Sun, Linjie Zhi, Shaobin Wang

Research output: Contribution to journalArticlepeer-review

113 Citations (Scopus)

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.

Original languageEnglish
Article number119146
JournalApplied Catalysis B: Environmental
Volume276
DOIs
Publication statusPublished - 5 Nov 2020
Externally publishedYes

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