Facile green synthesis of α-Bi2O3 nanoparticles: Its photocatalytic and electrochemical sensing of lead and ascorbic acid

Abstract

In the field of industrial waste treatment, there is a growing need for innovative approaches to combat environmental issues effectively. In this study, bismuth oxide nanoparticles were successfully synthesized using a cost-effective and environmentally friendly green combustion method. Following synthesis, standard characterization techniques were employed to reveal the properties of the α-Bi2O3 nanoparticles. X-ray diffraction analysis indicated an average crystalline size of ∼29.5 nm, while scanning electron microscopy provided insights into their morphology. Evaluation of the photo-catalytic degradation efficiency of α-Bi2O3 nanoparticles using methylene blue dye as the test substrate showed promising results, with efficiencies of 83 %, 89 %, and 91 % achieved under varying conditions of dye concentration, catalyst load, and pH. Furthermore, electrochemical analyses were conducted using lead nitrate and ascorbic acid, exploring concentrations ranging from 0.1 mM to 0.6 mM. Through cyclic voltammograms and electrochemical impedance spectroscopy, the specific capacitance of the electrode and the sensing capabilities of the nanoparticles were examined. These comprehensive analyses not only highlighted the photo-catalytic capabilities of α-Bi2O3 nanoparticles but also demonstrated their potential in electrochemical applications, indicating their versatility in addressing diverse environmental challenges. The meticulous exploration and characterization efforts aim to advance sustainable waste treatment methods, contributing to a cleaner and healthier environment.