OICC Press Iranian Journal of Catalysis 2345-4865 15 4 2025 12 31 Greener synthesis of MNPs using Achyranthesaspera leaf extract: compared photocatalytic activity, reduction, and adsorption investigations for the environmental remediation 10.57647/j.ijc.2025.1504.40 EN Raju Shekhanavar Department of chemistry, Rani channamma University, Belagavi, Karnataka, 591156, India Kantharaju Kamanna Department of chemistry, Rani channamma University, Belagavi, Karnataka, 591156, India https://orcid.org/0000-0002-4696-5401 Journal Article 2025 12 31 A greener method described using water extract leaves of Achyranthesaspera plant (Uttarani plant) employed for iron oxide nanoparticles (MNPs) preparation, and demonstrated application of the prepared NPs for dye removal from the contaminated water by photo chemically. The Achyranthes aspera leaves were used for the first time for the iron oxide NPs preparation as a biogenic method. The phytochemical present in the extracted solution served as a reducing agent, facilitating NPs formation. The prepared MNPs homogeneity was examined by FT-IR, UV-Vis, XRD, HR-SEM, and VSM analyses. Further, these MNPs were utilized for the decolourization of the industrial effluent (IE) and methylene blue (MB), and the catalytic reduction properties of 4-NA to 4-AA were evaluated. The decolourization of the MB and IE was monitored by UV-Vis, and followed by kinetic comparisons and HR-MS analysis, which revealed that adsorption takes place on the surface. Highlights ·       Novel greener method synthesis of magnetic nanoparticle described.    ·       Prepared MNPs could decolorize MB and Industrial effluent dyes in the presence of sunlight. ·       Experimentally proved, the processes of adsorption of the dye take place on MNPs. ·       Also studied prepared MNPs can be used for the reduction of 4-nitroaniline to 4-amino aniline.  ·       The prepared MNPs system revealed potential for the removal of MB and textile dye effluent.