Revealing Intrinsic Relations Between Cu Scales and Radical/Nonradical Oxidations to Regulate Nucleophilic/Electrophilic Catalysis

Zhonghao Wan, Yang Cao, Zibo Xu, Xiaoguang Duan, Shuguang Xu, Deyi Hou, Shaobin Wang, Daniel C.W. Tsang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

20 Citations (Scopus)

Abstract

Copper/carbon catalysts under different electron-transfer regimes can evolve both radical and nonradical pathways in peroxide activation. However, the underlying trigger to manipulate the transition in between is unclear. Herein, it is revealed that Cu species in a state of sub-nanometre particles (SNPs, < 1 nm) exhibits an electrophilic nature, which is opposite to its nucleophilic nature at a larger scale (nanoclusters, > 1 nm). This switch between nucleophile/electrophile nature leads to distinct catalytic mechanisms in activating peroxymonosulfate, i.e., nonradical 1O 2 surface-bound upon Cu SNPs and unleashed radical OH induced by Cu nanoclusters. The vacancy defects of biomass-derived carbon can stabilize Cu SNPs via a Cu-V-C configuration, circumventing the contemporary difficulties in coordinating/preserving Metal-N-C bonding. Depth profiling, chemical probes, and charge density difference modeling support the regulable electroactive nature over modulated Cu scales. This featured system is applied for tetracycline degradation, and Cu SNPs demonstrates the highest efficacy with their better peroxymonosulfate confinement in nonradical regime (88.9% removal, nucleophilic activation). Comparatively, severe Cu leaching caused by radical erosion (44.8% removal, electron-donation) is undesirable. Overall, a regulable heterogeneous catalysis is unraveled over carbon-supported Cu sites through scaling modulation and defect engineering. This study illuminates a promising path for customizing biomass-derived Cu-based catalysts to achieve versatile catalysis.

Original languageEnglish
Article number2212227
JournalAdvanced Functional Materials
Volume33
Issue number12
DOIs
Publication statusPublished - 16 Mar 2023

Keywords

  • biomass-derived/biochar-supported catalysts
  • defect engineering
  • heterogeneous catalyses
  • nonradical oxidations
  • sub-nanoparticle regulations

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics

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