Background: Iron Oxide nanoparticles have enormous applications in environmental remediation and catalysis. The synthesis of such nanoparticles through a green approach provides a significant advantage due to the non-toxic nature of the ingredients involved.

Methods: In the present work, Diospyros lotus fruit extract was used for the synthesis of iron oxide nanoparticles (NPs). The plant biomolecules were extracted employing two different solvents, i.e. water and methanol. The effect of both the extracts on the reduction of metal salt as well as on the shape and size of the produced NPs was investigated.

Results: UV-Visible spectroscopy confirmed the synthesis of iron oxide NPs, Fourier Transform Infrared (FTIR) spectrum depicted the presence of biomolecules on the surface of NPs as capping agents, X-ray Diffraction (XRD) diffractogram confirmed the crystalline structure of mixed iron oxide NPs and Scanning Electron Microscopy (SEM) images showed the spherical shape of NPs. The synthesized NPs were exploited to catalyze the degradation of methylene blue dye in the Fenton type catalytic reaction. The degradation reaction was monitored using UV-Visible spectroscopy, which indicated that the percent degradation increased from 15% (without iron oxide NPs) to 91% in the presence of organic extract prepared iron oxide NPs and to 81% in the presence of aqueous extract prepared iron oxide NPs. The effect of the concentration of methylene blue and iron oxide NPs on the degradation process was also investigated.

Conclusion: The results indicated the potential of synthesized nanoparticles to promote catalytic reactions involved in environmental remediation.

背景：氧化铁纳米粒子在环境修复和催化方面具有巨大的应用。由于涉及的成分的无毒性质，通过绿色方法合成这种纳米颗粒提供了显着的优势。

方法：在目前的工作中，柿属的荷叶提取物被用于合成氧化铁纳米颗粒（NPs）。使用两种不同的溶剂（即水和甲醇）提取植物生物分子。研究了两种提取物对金属盐还原以及所产生NP的形状和大小的影响。

结果：紫外可见光谱证实了氧化铁纳米颗粒的合成，傅立叶变换红外（FTIR）光谱描绘了作为封端剂的纳米颗粒表面上存在生物分子，X射线衍射（XRD）衍射图证实了混合铁的晶体结构氧化物纳米颗粒和扫描电子显微镜（SEM）图像显示了纳米颗粒的球形。利用合成的NPs在Fenton型催化反应中催化亚甲基蓝染料的降解。使用紫外可见光谱监测降解反应，这表明在有机提取物制备的氧化铁NP存在下，降解百分比从15％（无氧化铁NPs）增加至91％，在水提取物存在下降解至81％制备氧化铁纳米颗粒。

结论：结果表明合成的纳米颗粒具有促进环境修复中催化反应的潜力。