Iron oxide nanoparticles (IONPs) were prepared by biosynthesis method using Aegle marmelos extract followed by calcination at 400 °C. Synthesised IONPs were characterized by UV–Vis spectroscopy, X-Ray diffraction technique, Fourier transform infrared spectroscopy, Scanning electron microscopy and Energy dispersive spectroscopy, Zeta potential and Dynamic light scattering analysis. Furthermore, Antifungal activity of the synthesised IONPs was tested against soil isolated plant pathogenic fungi F.solani (12 ± 0.53 mm) compared with fluconazole (7 ± 0.38) at 30 µg/ml. The antimicrobial activity of the IONPs was tested against E.coli (21 ± 0.43 and 30 ± 0.38 mm) and S.aureus (19 ± 0.54 and 28 ± 0.65 mm) at 15 and 30 µg/ml concentration respectively and compared with Streptomycin (16 ± 0.43 and 22 ± 0.34 at 15 and 30 µg/ml). Photocatalytic activity of the synthesised IONPs was studied using Brilliant green dye under UV light. 95.89% degradation was observed in 90 min. The photocatalytic degradation followed the first order kinetics model and the K value was 0.0458 min⁻¹.

氧化铁纳米颗粒（IONPs）通过使用生物合成方法制备木橘提取物接着进行煅烧在400℃下。通过紫外可见光谱，X射线衍射技术，傅立叶变换红外光谱，扫描电子显微镜和能量色散光谱，Zeta电位和动态光散射分析对合成的IONP进行了表征。此外，测试了合成的IONPs对土壤分离的植物病原真菌F.solani（12±0.53 mm）和氟康唑（7±0.38）的抗真菌活性（30 µg / ml）。所述IONPs的抗微生物活性对所测试的大肠杆菌（21±0.43 30±0.38毫米），金黄色葡萄球菌（浓度分别为15和30 µg / ml）（19±0.54和28±0.65 mm），并与链霉素（浓度分别为15和30 µg / ml的16±0.43和22±0.34）比较。使用亮绿色染料在紫外光下研究了合成的IONPs的光催化活性。在90分钟内观察到95.89％的降解。光催化降解遵循一级动力学模型，并且K值为0.0458min ^-1。