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Iron based nanoparticles were synthesized through an eco-friendly one-step reaction of FeCl 3 and Syzygium jambos (L.) Alston leaf extract in water. The morphology and structure of the SJA-Fe nanoparticles were characterized by UV–vis, TEM and XRD. The obtained biogenic SJA-Fe nanoparticles demonstrated very high efficiency in removing chromium Cr(VI), a toxic pollutant in surface and ground water. The removal capacity as high as 983.2 mg Cr(VI)/g Fe was achieved. It was found that increased temperature and lowered pH were favored in the Cr(VI) removal. In addition, most of the typical coexisting substances such as humic acid showed insignificant effects on Cr(VI) removal. A pseudo second-order model was developed to simulate the kinetics of this process. Furthermore, a reaction mechanism was proposed. [ABSTRACT FROM AUTHOR] more...

The eco-friendly synthesis and application of Fe nanoparticles (Fe NPs) with higher activity and stability has aroused wide attention in the field of pollutant remediation. In this work, 15 plants extracts were selected for the plant-mediated synthesis of Fe NPs. The as-synthesized particles’ morphology and structure were characterized by transmission electron microscopy, X-ray diffraction and UV–Vis spectroscopy. The contents of four main active biomolecules in the 15 extracts were determined, and comparative studies were further carried out to clarify the key component closely related to the reducing capacity. The results demonstrate that polyphenol is the leading ingredient involved in the biosynthesis of Fe NPs. Then Fe products synthesized by three extracts with distinct content of polyphenol were employed to remove Cr (VI) in the aqueous solution, indicating that the activity of the Fe NPs for Cr (VI) removal is consistent with the reducing capacity of the extracts. Furthermore, the Fe NPs synthesized by S. jambos （ L. ） Alston extract (SJA-Fe NPs) showed significant removal capacity of Cr(VI) with 698.6 mg Cr(VI) per g of iron. [ABSTRACT FROM AUTHOR] more...