Plant‐assisted synthesis of Fe 3 O 4 nanoparticles for catalytic degradation of methyl orange dye and electrochemical sensing of nitrite

• Published in: Electroanalysis (New York, N.Y.) Vol. 36; no. 9
• Main Authors: Husnaa Mohd Taib, Siti, Moozarm Nia, Pooria, Rasit Ali, Roshafima, Izadiyan, Zahra, Izzah Tarmizi, Zatil, Shameli, Kamyar
• Format: Journal Article
• Language: English
• Published: 01.09.2024
• ISSN: 1040-0397; 1521-4109
• DOI: 10.1002/elan.202300422

The present study details a more environmentally friendly method for synthesizing iron oxide nanoparticles (Fe 3 O 4 ‐NPs) utilizing Hibiscus sabdariffa ( H. sabdariffa ) leaf extract. The produced H. sabdariffa /Fe 3 O 4 ‐NPs underwent characterization through VSM, XRD, FESEM‐EDX, TEM and FTIR analyses. The FESEM and TEM images revealed that the H. sabdariffa /Fe 3 O 4 ‐NPs had a narrow distribution and an average particle size of 5±2 nm. Catalytic degradation studies of the synthesized Fe 3 O 4 ‐NPs exhibited efficient reduction of methyl orange (MO) dye. The degradation of MO catalysed by H. sabdariffa /Fe 3 O 4 ‐NPs follow the pseudo‐first order kinetics, with a rate constant of 0.0328 s −1 (R2=0.9866). Moreover, in electrochemical sensing studies, the anodic peak current of nitrite (NO 2 − ) for H. sabdariffa /Fe 3 O 4 ‐NPs/GCE showed a linear relationship with its concentration within the range of 0.5–7.5 mM, achieving a detection limit of 0.29 μM. These findings demonstrate that the modified electrode with Fe 3 O 4 ‐NPs synthesized using H. sabdariffa leaf extract serve as a novel electrochemical sensor for determining NO 2 − with high sensitivity and reproducibility.