Anchoring single atom cobalt on two-dimensional MXene for activation of peroxymonosulfate

[Display omitted] •A simple and general single atom metals synthesis method was developed.•Activation of PMS by single atom Co achieved ultrafast degradation of refractory organic pollutants.•Co(III)/Co(II) cycle was triggered by MXene substrate.•Single atom Co catalyst remained excellent performanc...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2021-06, Vol.286, p.119898, Article 119898
Main Authors: Song, Haoran, Du, Rong, Wang, Yuwei, Zu, Daoyuan, Zhou, Rui, Cai, Yang, Wang, Fangxian, Li, Zhuo, Shen, Yongming, Li, Changping
Format: Article
Language:English
Subjects:
Carbamazepine
Catalysts
Cobalt
Defects
Environmental degradation
Heavy metals
Hydroxyl radicals
Metal ions
Metals
Molten metal salts
MXene
MXenes
Oxidation
Peroxymonosulfate
Pollutant removal
Pollutants
Rivers
Salts
Single atom cobalt
Substrates
Sulfamethoxazole
Titanium
Transition metals
Vacancies
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Summary:[Display omitted] •A simple and general single atom metals synthesis method was developed.•Activation of PMS by single atom Co achieved ultrafast degradation of refractory organic pollutants.•Co(III)/Co(II) cycle was triggered by MXene substrate.•Single atom Co catalyst remained excellent performance under alkaline condition. A simple and general vacancy defects anchoring strategy was developed for the synthesis of single atom metals, which exhibited excellent performance for peroxymonosulfate (PMS) activation. Production of Ti vacancy defects, conversion of metal ions to metal atoms, anchoring of single atom metals and construction of two-dimensional (2D) MXene structure on the eco-friendly Ti2AlN ceramic substrate were accomplished in one step using the molten transition metal salts. Complete removal of model pollutants including carbamazepine (CBZ), sulfamethoxazole (SMX) and 2,4-dichlorophen (2,4-DCP) was achieved within less than 2 min in PMS/single atom Co process. Hydroxyl radical (OH), sulfate radical (SO4-) and nonradical oxidation jointly contributed to pollutants degradation. More importantly, the exposed Ti atoms with strong reducibility of MXene substrate triggered the Co(III)/Co(II) cycle and thus accelerated PMS activation. The single atom Co catalyst exhibited excellent performance even under alkaline condition or in actual river water.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2021.119898