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. Issue 23 (1st December 2022)

• Record Type: Journal Article
• Authors: Halligudra, Guddappa; Paramesh, Chitrabanu Chikkanayakanahalli; Gururaj, Roshan; Giridasappa, Amulya; Sabbanahalli, Chetana; Channapillekoppalu Siddegowda, Ananda Kumar; Madikere Raghunathareddy, Anil Kumar; Rangappa, Dinesh; Doddakunche Shivaramu, Prasanna
• Is Part Of: Ceramics international. Volume 48:Issue 23(2022)Part B
• Page Start: 35698
• Page End: 35707
• Publication Date: 2022-12-01
• Subjects: Heterogeneous magnetic catalyst -- Reduction of p-nitrophenol -- Methylene blue -- Methyl orange -- Electrochemical sensor; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.06.188
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In the present study, Fe3 O4 nanoparticles (NPs) supported MoS2 nanoflowers (Fe3 O4 –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 Fe3 O4 –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 Fe3 O4 –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 Fe3 O4 –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 Fe3 O4 –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 Fe3 O4 –MoS2 has great potential to be developed as a catalyst and electrochemical sensor material for industrial applications.