Fabrication of cost-effective green assisted synthesis of MoO ₃ NPs: its photocatalytic activity and electrochemical sensing actions on lead, mercury, and paracetamol molecules

The synthesis of transition molybdenum metal oxide (MoO3 nanoparticle) was achieved by bio-mediated (Aegle marmelos leaves) combustion process. The characteristics of prepared nanoparticle were well analysed by Powder-X-ray diffraction (PXRD), Scanning electron microscopy-Energy dispersive X-ray (SEM-EDAX), Fourier transform infra-red (FT-IR) spectroscopy, and UV–Visible absorption spectroscopy. The formation of orthorhombic phase structure and average crystallite size (23.6 nm) of MoO3 nanoparticle was confirmed by PXRD studies. The energy-band gap of achieved sample was found to be 3.1 eV recorded by UV–Visible absorption spectroscopy. This electron transition property directly influences the prepared sample as an excellent photo-catalyst for textile industrial Bromophenol Blue (BPB) dye under irradiation of UV light. The excellent photocatalytic performance on BPB dye was observed with 89.7% at 105 min, which is supported by its lower kinetic constants 17.42 × 10−3 min−1. The electrochemical measurements for investigating capacitance and resistance of modified graphite-MoO3 nanoparticle electrode under three-electrode system using 0.1 M HCl in the different scan rates 0.01–0.05 V/s by cyclic-voltammetry (CV) and electrochemical impedance spectroscopic (EIS) analysis. This investigation confirms the good sensing actions towards Lead, mercury, and Paracetamol molecules by impact of alteration in redox peak potentials.