Metal-organic frameworks-derived MnO 2 /Mn 3 O 4 microcuboids with hierarchically ordered nanosheets and Ti 3 C 2 MXene/Au NPs composites for electrochemical pesticide detection

Transition metal oxides (TMOs) derived from metal - organic frameworks (MOF) combined with two-dimensional (2D) transition metal carbides possibly pave an innovative pathway for designing promising biosensors. Herein, a novel electrochemical sensing platform has been fabricated for ultra-sensitive d...

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Bibliographic Details
Published in:Journal of hazardous materials 2019-07, Vol.373, p.367
Main Authors: Song, Dandan, Jiang, Xinyu, Li, Yanshan, Lu, Xiong, Luan, Sunrui, Wang, Yuanzhe, Li, Yan, Gao, Faming
Format: Article
Language:English
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Summary:Transition metal oxides (TMOs) derived from metal - organic frameworks (MOF) combined with two-dimensional (2D) transition metal carbides possibly pave an innovative pathway for designing promising biosensors. Herein, a novel electrochemical sensing platform has been fabricated for ultra-sensitive determination of organophosphorus pesticides (OPs), based on MOF-derived MnO /Mn O and Ti C MXene/Au NPs composites. Remarkably, the three-dimensional (3D) MnO /Mn O hierarchical microcuboids derived from Mn-MOF are composed of vertically aligned, highly ordered nanosheets, and further combined with MXene/Au NPs yields synergistic signal amplification effect, with outstanding electrochemical performance, large specific surface area, and good environmental biocompatibility. Under the optimum conditions, the reported sensing platform AChE-Chit/MXene/Au NPs/MnO /Mn O /GCE can be utilized to detect methamidophos in a broad concentration range (10 -10 M), together with a good linearity (R = 0.995). Besides that, the biosensor possesses a low limit of detection (1.34 × 10 M), which far exceeds the maximum residue limits (MRLs) for methamidophos (0.01 mg/kg) established by European Union. Additionally, the feasibility of the proposed biosensor for detecting methamidophos in real samples has been demonstrated with excellent recoveries (95.2%-101.3%). Interestingly, the unique structures and remarkable properties of these composites make them attractive materials for various electrochemical sensors for monitoring either pesticide residuals or other environmentally deleterious chemicals.
ISSN:1873-3336
DOI:10.1016/j.jhazmat.2019.03.083