Green synthesis of V2O5 nanoparticles using Vinca rosea for enhanced electrochemical sensing, antibacterial, and photocatalytic applications
摘要
The advent of Vinca rosea leaves (VRL) extract-mediated synthesis of V2O5 nanoparticle is significant and cost-effective in electrochemical sensors and hetero junction photocatalyst. The X-ray diffraction (XRD) studies show the purity associated with crystallinity and phase formation with a crystallite size (20 ± 2 nm) of V2O5 nanoparticle. The lower energy band-gap as recorded by diffused reflectance spectroscopy (DRS), enhancing the dye-degradation process by trapping electrons-holes, corresponds to an excellent photocatalytic performance on Alizarin Red (AR) dye. The efficiency on dye-degradation performance under sunlight was determined to be 84.8% at 120 min, and its kinetic rate (K) is 0.01822 min−1 calculated by using ln(C/C0) = − kt. The electrochemical sensing analysis reveals an enhanced redox potential analyzed by cyclic voltammetry (CV) and higher capacitance from electrochemical impedance spectral (EIS) studies. The CV of prepared carbon-nano paste electrode shows a very good sensing activity on lithium (Li+) ions at 1–5 mV/s in 0.1 M HCl. The enhanced anodic and cathodic peak current with increasing concentrations of Li ion was observed to be + 7.66 × 10−5 A/cm2 sensitivity at + 0.13 V and − 1.98 × 10−4 A/cm2 at 0.22 V, respectively, with its R2 value of 0.9038. The antibacterial activity of V2O5 nanoparticles was tested against the three different bacteria of Bacillus cereus, Escherichia coli, and S. typhi by the disk-diffusion method. The novelty of this study shields a cost-effective bio-assisted combustion synthesis, and its experimental measurements give a new route of electrochemical detection of Li+ ions with various substances in a suitable electrolyte. Also, it plays as an excellent hetero junction photocatalyst and antibacterial agent.