Dual-functional Mo2C quantum dots enriched N-doped graphitic carbon layers in advanced oxidation processes (AOPs)

Advanced oxidation processes (AOPs) are reckoned effective for removing persistent and recalcitrant pollutants by reactive oxygen species (ROSs), including hydroxyl radicals (•OH), sulfate radicals (SO4•-), and superoxide radicals (•O2-), as well as singlet oxygen (1O2). In this work, the Mo2C quant...

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Bibliographic Details
Published in:Applied catalysis. A, General General, 2023-01, Vol.649, p.118963, Article 118963
Main Authors: Dong, Chencheng, Bao, Yan, Xing, Mingyang, Anpo, Masakazu, Zhang, Jinlong
Format: Article
Language:English
Subjects:
Advanced oxidation processes
Carbon
Dyes
Hydroxyl radicals
Ibuprofen
Metal carbides
Mo2C quantum dots
Molybdenum carbide
N-doped graphitic carbon layers
Oxidation
Oxygen enrichment
Pollutants
Quantum dots
Reactive oxygen species
Rhodamine
Singlet oxygen
Transition metals
Visible-light-driven
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Summary:Advanced oxidation processes (AOPs) are reckoned effective for removing persistent and recalcitrant pollutants by reactive oxygen species (ROSs), including hydroxyl radicals (•OH), sulfate radicals (SO4•-), and superoxide radicals (•O2-), as well as singlet oxygen (1O2). In this work, the Mo2C quantum dots enriched N-doped graphitic carbon layers (Mo2C QDs/NGCLs) were constructed via a facile two-step methodology. Interestingly, the Mo2C QDs/NGCLs acted as a highly efficient cocatalyst and/or catalyst simultaneously in AOPs, in particular visible-light-driven (VLD) Fenton and VLD PMS activation. In the hydroxyl radical-based AOPs (•OH-AOPs), it exhibited a remarkable removal efficiency for a range of aromatic organic pollutants, including rhodamine B (RhB) (99.9 %), phenol (90 %), benzophenone-3 (BZP) (83 %), methyl orange (MO) (58 %), methyl blue (MB) (89 %), ibuprofen (IBU) (100 %), and carbamazepine (CBZ) (50 %). Sulfate radicals-based AOPs (SR-AOPs) effectively degrade RhB (72 %), MO (83 %), IBU (70 %), and BZP (100 %). Thus, the present findings confirmed the potential of transition metal carbides for AOP applications and established a solid theoretical and technical basis for further research. [Display omitted] •Mo2C QDs/NGCLs were both useful in the VLD-Fenton process (i.e., cocatalyst) and VLD SR-AOPs (i.e., catalyst).•The conversion efficiency of H2O2 is 78.0%, benefiting from the plasmon-hot electrons escaping from Mo2C QDs.•Singlet oxygen (1O2) played a vital role in VLD SR-AOPs.•Mo2C QDs/NGCLs retained excellent performance in AOPs.
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2022.118963