Eco-friendly Green Manganese Oxide Nanoparticles Using Senna auriculata Extract: Antimicrobial Potential and Characterization

IJEP 46(4): 303-310 : Vol. 46 Issue. 4 (April 2026)

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S. Raziya Tabassum and A. Thaminum Ansari*

Government Thirumagal Mills College (Affiliated to Thiruvalluvar University), Department of Chemistry, Gudiyattam, Vellore – 632 602, Tamil nadu, India

Abstract

The study aims to reduce the harmful effects of synthetic dyes on the environment, with many studies focusing on treating contaminated textile wastewater. Green synthesis of manganese dioxide nanoparticles was carried out using an aqueous extract from Senna auriculata flower. A one-step green pot method was used and the materials were characterized by XRD, FTIR, SEM and EDX analysis. The spectral characteristics showed that the synthesis parameters significantly affected the yield and particle size. Antibacterial, larvicidal and photocatalytic degradation tests were performed to evaluate the efficacy of MnO2 nanoparticles. Results showed characteristic absorption peak around 260–270 nm, with spherical and porous morphology observed in FTIR spectra, which displayed peaks in the range of 570–1230 cm-1, indicating the presence of metal oxide nanoparticles. Morphological studies revealed that MnO nanoparticles are granular in shape. The crystal phase was identified and high thermal stability alongwith a mesoporous structure within 60-120 nm size was observed. The antibacterial results indicated a dose-dependent increase in efficacy, with higher concentrations (100 mg/well) producing larger zones of inhibition against both bacteria and fungi. The larvicidal activity of MnO was significant at 10 ppm. Additionally, initial dye concentration of 100 ppm was reduced to 76 ppm through photocatalytic degradation, demonstrating MnO nanoparticle catalyst activity. The findings suggest that green synthesized MnO nanoparticles are highly effective adsorbents for removing anionic dyes, as well as for antibacterial and pesticide applications.

Keywords

Ecotoxic, Azo dyes, Nanotechnology, MnO, Larvicidal, Antibacterial

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