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• W4307688035 endingPage "135002" @default.
• W4307688035 startingPage "135002" @default.
• W4307688035 abstract "Although peroxymonosulfate (PMS) can be efficiently activated by ultrasound-driven piezocatalyst, there are still uncertainties on the mechanisms. Herein, molybdenum disulfide piezocatalysts with different sulfur vacancy (V S ) types were prepared by hydrothermal (MoS 2 –H) and solvothermal methods (MoS 2 –S). The configuration of Vs in MoS 2 was characterized by X-ray photoemission spectroscopy (XPS), electron paramagnetic resonance spectroscopy (EPR), and O 2 diffuse reflectance infrared Fourier transform spectroscopy (O 2 -DRIFTS). Surface in-plane V S and edge V S dominated on MoS 2 –H and MoS 2 –S. MoS 2 –S exhibits higher PMS activation performance with 85.0% degradation rate of 4-chlorophenol within 2 hours. Although in-plane V S feature a stronger PMS adsorption energy compared with edge V S (−1.64 vs. −0.94 eV), PMS activation is not favorable at the in-plane V S sites of MoS 2 (MoS 2 –H). In piezo-polarized MoS 2 , the separated charge carriers accumulate at the edges, where edge V S (MoS 2 –S), as the active site, strengthens the coupling between electrons and PMS. As a result, the O–O bond length in PMS is increased from 1.467 to 1.470 Å, enabling the facile activation of PMS with the generation of more abundant ·OH and ·SO 4 − radicals. This work clearly explains the PMS activation mechanism from both experimental and theoretical aspects and provides directions to tailor the structure and atom vacancies of piezocatalysts. • MoS 2 with different sulfur vacancy (V S ) types were prepared. • An ultrasound-driven MoS 2 system were used to activate PMS. • In-plane and edge V S played different roles in PMS activation. • The O–O and O–H bonds in PMS were prolonged by edge V S." @default.
• W4307688035 created "2022-11-05" @default.
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• W4307688035 date "2022-12-01" @default.
• W4307688035 modified "2023-09-29" @default.
• W4307688035 title "Peroxymonosulfate activation in ultrasound-driven molybdenum disulfide piezocatalysis: The effect of sulfur vacancy" @default.
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• W4307688035 doi "https://doi.org/10.1016/j.jclepro.2022.135002" @default.
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