Green synthesis of m-LaVO₄ nanoparticles using Costus igneus leaves extracts and its photocatalytic and electrochemical applications

Monoclinic lanthanum vanadate (m-LaVO₄) was synthesized using a facile combustion method, with ammonium metavanadate and lanthanum nitrate serving as precursors. Spectroscopic techniques were employed for the characterization of the synthesized m-LaVO₄ nanoparticles. Furthermore, m-LaVO₄ was utilized as a photocatalyst for the photodegradation of methylene blue dye under visible light radiation, demonstrating high efficiency within 90 min of light irradiation. The electrochemical characteristics of m-LaVO₄ were studied using a carbon paste electrode in a 0.1 M HCl solution. These m-LaVO₄ samples exhibited superior sensitivity in cyclic voltammetry tests at different scan rates when ascorbic acid and lead nitrate were utilized as analytes. Consequently, m-LaVO₄ holds potential for applications in electrochemical sensor technology.