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Insights into Heterogeneous Catalysis of Persulfate Activation on Dimensional-Structured Nanocarbons

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Department of Chemical Engineering, Curtin University, GPO Box U1987, WA6845 Perth, Australia
* (S.W.) E-mail: [email protected]. Phone: +61 8 9266 3776.
* (H.S.) E-mail: [email protected]. Phone: +61 8 9266 5403.
Cite this: ACS Catal. 2015, 5, 8, 4629–4636
Publication Date (Web):June 26, 2015
https://doi.org/10.1021/acscatal.5b00774
Copyright © 2015 American Chemical Society
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Abstract

A variety of dimensional-structured nanocarbons were applied for the first time as metal-free catalysts to activate persulfate (PS) for catalytic oxidation of phenolics and dyes as well as their degradation intermediates. Single-walled carbon nanotubes (SWCNTs), reduced graphene oxide (rGO), and mesoporous carbon (CMK-8) demonstrated superior catalytic activities for heterogeneous PS activation, whereas fullerene (C60), nanodiamonds, and graphitic carbon nitride (g-C3N4) presented low efficiencies. Moreover, the carbocatalysts presented even better catalytic performances than activated carbon and metal oxides, such as Fe3O4, CuO, Co3O4, and MnO2. The activity of prepared rGO-900 was further competing to the most efficient electron donor of zerovalent iron (ZVI). Both characterization and oxidation results suggested that the catalytic performances of the nanocarbons are determined by the intrinsic atom arrangements of carbon hybridization, pore structure, defective sites, and functional groups (especially the carbonyl groups). Electron paramagnetic resonance (EPR) spectra revealed that carbocatalysts might act as an excellent electron bridge in activation of PS to oxidize adsorbed water directly to generate hydroxyl radicals, distinct from homogeneous and metal-based catalytic activation. This study discovers several efficient nanocarbons for heterogeneous PS activation, and it presents new insights into the catalytic activation processes, providing a fascinating strategy to develop metal-free catalysts for green remediation.

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