Magnetic Fe3O4 supported MoS2 nanoflowers as catalyst for the reduction of p-nitrophenol and organic dyes and as an electrochemical sensor for the detection of pharmaceutical samples
Ceramics International(2022)
摘要
In the present study, Fe3O4 nanoparticles (NPs) supported MoS2 nanoflowers (Fe3O4–MoS2) are prepared by a simple and eco-friendly hydrothermal method and are well-characterized for their structure, morphology, size, phase composition, and magnetic property using XRD, FT‐IR, SEM, EDX, HR-TEM, SEM-elemental mapping and VSM techniques. As prepared Fe3O4–MoS2 showed good catalytic activity for the reduction of p-nitrophenol (p-NP), methylene blue (MB), and methyl orange (MO) dyes in the presence of NaBH4 in 10 min, 2 min, and 2 min with rate constants of 0.15 min−1, 0.88 min−1 and 0.53 min−1 respectively. Moreover, the Fe3O4–MoS2 catalyst was recovered magnetically in good yield and the recovered catalyst also showed a similar catalytic efficacy even up to nine cycles. Further, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements for Fe3O4–MoS2 electrode were performed in 1 M KOH aqueous electrolytes with (+0.50, −0.73 V) and (+0.10, −0.68 V) oxidation and reduction peaks in the reversible redox process respectively. The electrode exhibited a specific capacitance of 1.42 F g−1 basic electrolyte. EIS measurements showed a reduction in the charge transfer resistance. Modified carbon paste electrode using Fe3O4–MoS2 is used as a sensor for the detection of paracetamol (PCM), ascorbic acid (AA), hydrogen peroxide (HP), and tetracycline (TC) pharmaceutical samples, which showed well-separated peaks. These results indicate that the prepared Fe3O4–MoS2 has great potential to be developed as a catalyst and electrochemical sensor material for industrial applications.
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关键词
Heterogeneous magnetic catalyst,Reduction of p-nitrophenol,Methylene blue,Methyl orange,Electrochemical sensor
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