Issue 6, 2019

Fe/Mn nanoparticles encapsulated in nitrogen-doped carbon nanotubes as a peroxymonosulfate activator for acetamiprid degradation

Abstract

N-Doped carbon nanotubes encapsulating bimetallic Fe/Mn nanoparticles (FeMn@NCNTs) were fabricated after a one-step pyrolysis and were used as the catalyst for peroxymonosulfate activation to degrade acetamiprid. The FeMn@NCNTs showed uniform nanotubes with rich N doping and the encapsulated FeMn nanoparticles were doubly protected by both NCNTs and a clingy graphitic structure. The results indicated that the confined FeMn nanoparticles were designated as Fe2.7Mn0.3C according to the XRD pattern and elemental composition. Radical quenching indicated that SO4˙ and ˙OH were the dominant radicals in the FeMn@NCNTs/PMS system. The indispensable roles of both radical pathways of O2˙ and non-radical 1O2 in the superior catalytic performance were also confirmed. As a result, both the embedded FeMn nanoparticles and NCNTs in FeMn@NCNTs contributed to the acetamiprid degradation with multiple degradation mechanisms. XPS results confirmed the formation of redox cycles between the multiple valence states of Mn and Fe, which ensured the superior catalytic activity of FeMn@NCNTs for PMS activation. In addition, only a small decrease in the catalytic performance from 99.5% to 90% was observed after four cycles. The catalytic activity of used FeMn@NCNTs was mostly recovered after heat regeneration (350 °C), which exhibited the excellent stability and reusability of the FeMn@NCNTs.

Graphical abstract: Fe/Mn nanoparticles encapsulated in nitrogen-doped carbon nanotubes as a peroxymonosulfate activator for acetamiprid degradation

Supplementary files

Article information

Article type
Paper
Submitted
24 feb. 2019
Accepted
11 apr. 2019
First published
11 apr. 2019

Environ. Sci.: Nano, 2019,6, 1799-1811

Fe/Mn nanoparticles encapsulated in nitrogen-doped carbon nanotubes as a peroxymonosulfate activator for acetamiprid degradation

P. Duan, T. Ma, Y. Yue, Y. Li, X. Zhang, Y. Shang, B. Gao, Q. Zhang, Q. Yue and X. Xu, Environ. Sci.: Nano, 2019, 6, 1799 DOI: 10.1039/C9EN00220K

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