Journal
CHEMOSPHERE
Volume 283, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.131154
Keywords
Metal-organic framework derivatives; Ultrasonic-assisted degradation; Water-soluble organic dyes; Singlet oxygen; Non-radical pathway
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Funding
- National Natural Science Foundation of China [21707170]
- Fundamental Research Funds for the Central Universities, South-Central University for Nationalities [CZY20031, KTZ20043]
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Fe/N-doped carbon magnetic nanocubes (Fe/N-C MNCs) as a catalyst can synergistically enhance the degradation efficiency of organic dyes with ultrasonic irradiation, primarily through a non-radical pathway. Additionally, Fe/N-C MNCs predominantly produce singlet oxygen (O-1(2)) upon H2O2 activation, contributing to catalytic degradation instead of hydroxyl and/or superoxide anion radicals.
Fe/N-doped carbon magnetic nanocubes (Fe/N-C MNCs) were feasibly fabricated through in situ thermal transformations of Prussian blue nanocubes (PB NCs) in an inert atmosphere, and the resultant composite employed as the heterogeneous noble-metal-free catalyst possessed satisfactory catalytic performance in hydrogen peroxide activation. By examining the properties of Fe/N-C MNCs, we demonstrate for the first time that the catalyst could act in synergy with ultrasonic irradiation and accelerate the selectivity of the degradation reaction of dyes. The degradation efficiency of the organic positively charged dye (methylene blue) is significantly increased after ultrasonic irradiation addition, probably owing to charge matching between a positively charged dye and the Fe/N-C MNCs. Interestingly, organic pollution degradation mainly follows a non-radical pathway. Furthermore, singlet oxygen (O-1(2)) is predominantly produced by Fe/N-C MNCs on H2O2 activation, and it is the contributor to catalytic degradation instead of hydroxyl and/or superoxide anion radicals. Moreover, the Fe/N-C MNCs exhibit excellent stability and reusability. These findings offer interesting insights into the potential application of functional noble-metal-free materials in catalysis and wastewater remediation under ultrasonic radiation.
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