One-step rapid removal of Cu(II) complexes via dual-active-site MOF catalysis with Peroxymonosulfate: Cooperative oxidation and adsorption

[Display omitted] •The ZIF-67/PMS system achieved 97.8% removal of Cu(II) complexes, even under alkaline conditions.•Sulfate radicals (SO4•−) and singlet oxygen (1O2) work synergistically to facilitate the decomplexation of Cu(II) complexes.•The system effectively treats diverse contaminated water s...

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Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2024-09, Vol.495, p.153604, Article 153604
Main Authors: Wang, Shuo, Guo, Simeng, Du, Xuedong, Liu, Ziqian, Yang, Yujia, Song, Yaran, Zhang, Qingrui
Format: Article
Language:English
Subjects:
Adsorption
Advanced oxidation processes
catalytic activity
chemical precipitation
EDTA (chelating agent)
Heavy metal complexes
heavy metals
humic acids
MOFs
oxalic acid
oxidation
singlet oxygen
sulfates
wastewater
water pollution
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Summary:[Display omitted] •The ZIF-67/PMS system achieved 97.8% removal of Cu(II) complexes, even under alkaline conditions.•Sulfate radicals (SO4•−) and singlet oxygen (1O2) work synergistically to facilitate the decomplexation of Cu(II) complexes.•The system effectively treats diverse contaminated water sources, maintaining > 90 % removal efficiency for various Cu(II) complexes. The removal of heavy metal complexes (HMCs) from wastewater is challenging due to their structural stability. Traditional methods require advanced oxidation processes (AOPs) for decomplexation, followed by chemical precipitation or adsorption. This study proposes a one-step approach using Co-imidazolate zeolitic framework-67 (ZIF-67) for simultaneous oxidation-decomplexation and in-situ adsorption of HMCs. The ZIF-67/peroxymonosulfate (PMS) system achieves 97.8 % removal of Cu(II)-citric acid complex (Cu-CA) in 60 mins, even under alkaline conditions, and demonstrates strong selectivity against ions like Ca, Mg, Na, and humic acid (HA). It effectively treats various contaminated water sources, achieving over 90 % removal efficiency for Cu(II) complexes such as oxalic acid (OA) and ethylenediaminetetraacetic acid (EDTA). The mechanism involves sulfate radicals (SO4•−) and singlet oxygen (1O2) for decomplexation, followed by amine groups in MOFs capturing Cu(II) ions through coordination interactions. This work offers a straightforward one-step method for HMCs contamination mitigation.
ISSN:1385-8947
DOI:10.1016/j.cej.2024.153604