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Tailoring porous NiMoO4 nanotube via MoO3 nanorod precursor for environmental monitoring: Electrochemical detection of micro-sized polyvinylchloride
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Researchers created a sensor using porous nickel-molybdenum oxide nanotubes that can electrochemically detect polyvinyl chloride microplastics in water. The sensor achieved reliable detection at low concentrations with good sensitivity, offering a faster alternative to traditional microscopy-based identification methods. This technology could enable more practical real-time monitoring of microplastic contamination in rivers and oceans.
Globally, the hidden contaminants like microplastics (MPs) combined with other harmful substances have agglomerated in rivers and oceans that pose a threat to human health. Thus, evaluating the toxicity of MPs separately and in combination with other pollutants must be done quickly and precisely. This work reports the synthesis of porous NiMoO nanotubes (NTs) from the transformation of MoO nanorods (NRs) via two steps hydrothermal methods for the effective detection of polyvinyl chloride (PVC) MPs. Transformation of MoO NRs to porous NiMoO NTs was comprehensively deduced by evaluating the crystalline, structural, compositional and morphological properties. The hydrophobic nature of MoO NRs and porous NiMoO NTs was proven experimentally and also by DFT calculations. The electrochemical detection of PVC MPs by NiMoO NTs was investigated by the CV and EIS measurements. Porous NiMoO NTs based electrode expressed the good detection towards PVC MPs with a reasonable sensitivity of ∼1.43 × 10 μA/ppm.cm, a low LOD of ∼18 ppm and R = ∼0.9781. EIS results revealed that porous NiMoO NTs electrode enabled to deliver sensing response at very low concentration of PVC MPs. Due to their easy interaction with hydrophobic PVC MPs, the hydrophobic NiMoO NTs controlled the sensing nature of the material and improved the electrochemical detection at the MP-NiMiO NTs interface.
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