Porous 3D superstructure of nitrogen doped carbon decorated with ultrafine cobalt nanodots as peroxymonosulfate activator for the degradation of sulfonamides

•Polyimide was used as a self-sacrifice template for fabricating Co@NCSS.•Co@NCSS exhibited excellent catalytic performance as PMS activator towards sulfonamides degradation.•1O2 was the dominant oxidative species in SMX degradation by Co@NCSS/PMS.•The decorated Co nanodots acted as the dominant cat...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2022-01, Vol.428, p.131329, Article 131329
Main Authors: Li, Yan, Xie, Meng, Zhang, Shiyong, Zhao, Lingxi, Kong, Lingshuai, Zhan, Jinhua, Zhao, Ru-Song
Format: Article
Language:English
Subjects:
Cobalt nanodots
Degradation
Peroxymonosulfate
Sulfonamides
Superstructures
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Summary:•Polyimide was used as a self-sacrifice template for fabricating Co@NCSS.•Co@NCSS exhibited excellent catalytic performance as PMS activator towards sulfonamides degradation.•1O2 was the dominant oxidative species in SMX degradation by Co@NCSS/PMS.•The decorated Co nanodots acted as the dominant catalytic sites for PMS activation. Superstructures have attracted attention because of their potential applications in chemistry and materials science. In this work, we report the preparation of a porous 3D superstructure of nitrogen-doped carbon decorated with ultrafine cobalt nanodots (Co@NCSS) derived from the self-assembly of polyimide nanoparticles. Utilizing modified ultra-small cobalt nanodots as main catalytically active sites, and the excellent quality and electron transport efficiency generated by this 3D porous superstructure, Co@NCSS exhibited excellent catalytic performance as a peroxymonosulfate (PMS) activator towards the degradation of several sulfonamides. Based on radical scavenging tests and electron paramagnetic resonance (EPR), singlet oxygen (1O2) was the dominant oxidative species. Furthermore, through the identification of degradation intermediates by HPLC-MS and DFT calculation, the pathway of sulfamethoxazole (SMX) degradation by Co@NCSS/PMS was analyzed. The possible catalytic mechanism of Co@NCSS/PMS for SMX degradation is also proposed in this paper. Co@NCSS has the potential to be an ideal material for removing antibiotics from wastewater.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2021.131329