Insights into ultrasound-enhanced methyl orange decolorization using transition metal dichalcogenides nanoflowers
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Date
2025-12-19
Publication Type
Journal Article
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yes
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Abstract
Ultrasound-assisted dye removal using transition metal dichalcogenide (TMD) nanostructures is frequently attributed to piezocatalysis; however, the actual mechanisms involved remain poorly understood. In this study, we investigate the role of physical adsorption in the rapid decolorization of methyl orange (MO) using few-layered MoS₂ and MoSe₂ nanoflowers (NFs) under ultrasonic treatment. Remarkably, complete decolorization was observed within 10 s. Through systematic desorption experiments in ethanol, combined with UV-Vis spectroscopy and Raman analysis, we demonstrate that this rapid removal is dominated by strong electrostatic adsorption rather than catalytic degradation. Quantitative analysis revealed recovery rates of 98.8 % for MoS₂ and 88.8 % for MoSe₂, confirming the molecular integrity of MO post-desorption. Density functional theory (DFT) calculations highlight the contribution of interfacial charge transfer to the adsorption process. Our findings underscore that sono-adsorption, rather than piezocatalysis alone, plays a predominant role in dye removal using TMDs and call for a more rigorous mechanistic distinction in future ultrasound-driven piezocatalytic studies.
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published
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Journal / series
Volume
377
Pages / Article No.
134390
Publisher
Elsevier
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Date created
Subject
TMDs nanoflowers; Decolorization; Piezocatalysis; Adsorption
Organisational unit
08705 - Gruppe Pané Vidal
09654 - Mougel, Victor / Mougel, Victor
02205 - FIRST-Lab / FIRST Center for Micro- and Nanoscience
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Funding
192012 - Mechano-chromic, Voltage-sensitive Electrostimulators: Innovative Piezoelectric Biomaterials for Electro-stimulated Cellular growth (SNF)
101025295 - Novel, high-throughput compatible dry transfer approach to enable high performance, suspended CVD 2D material heterostructure electronic devices and their applications (EC)
101025295 - Novel, high-throughput compatible dry transfer approach to enable high performance, suspended CVD 2D material heterostructure electronic devices and their applications (EC)