Metal-organic frameworks-derived MnO/MnO microcuboids with hierarchically ordered nanosheets and TiC MXene/Au NPs composites for electrochemical pesticide detection.

08:00 EDT 23rd March 2019 | BioPortfolio

Summary of "Metal-organic frameworks-derived MnO/MnO microcuboids with hierarchically ordered nanosheets and TiC 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 determination of organophosphorus pesticides (OPs), based on MOF-derived MnO/MnO and TiC MXene/Au NPs composites. Remarkably, the three-dimensional (3D) MnO/MnO 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/MnO/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.


Journal Details

This article was published in the following journal.

Name: Journal of hazardous materials
ISSN: 1873-3336
Pages: 367-376


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