Aging effects on the stabilisation and reactivity of iron-based nanoparticles green synthesised using aqueous extracts of Eichhornia crassipes

Yunqiang YI, Yufen WEI, Po Keung Eric TSANG, Zhanqiang FANG

Research output: Contribution to journalArticle

Abstract

Aging effects play a crucial role in determining applications of green-synthesised iron-based nanoparticles in wastewater treatment from laboratory scale to practical applications. In this study, iron-based nanoparticles (Ec-Fe-NPs) were synthesised using the extract of Eichhornia crassipes and ferric chloride. Scanning electron microscopy (SEM) revealed that the fresh Ec-Fe-NPs were spherical and had a narrow particle size range (50 to 80 nm). X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) demonstrated that the Ec-Fe-NPs were mainly amorphous in nature and consisted of Fe⁰, FeO, Fe₂O₃ and Fe₃O₄. As they aged, the particle size of the liquid Ec-Fe-NPs gradually increased and then tended to stabilise. Ec-Fe-NPs that were aged for 28 days were only 19% less efficient than fresh material at removing Cr(VI). Extracts aged up to 28 days were also tested, and their antioxidant capacity was found to be 15.4% lower than that of the fresh extracts. Furthermore, the removal efficiency of Cr(VI) using iron-based nanoparticles synthesised with the aged extracts was 67.2%. Finally, the active components of the extracts, which were responsible for the reactivity and stability of the iron-based nanoparticles, were identified by liquid chromatography–mass spectrometry. Overall, green-synthesised iron-based nanoparticles show promise for Cr(VI) removal from wastewater in practical applications. Copyright © 2019 Springer-Verlag GmbH Germany, part of Springer Nature.
Original languageEnglish
Pages (from-to)28361-28371
JournalEnvironmental Science and Pollution Research
Volume26
Issue number27
Early online dateAug 2019
DOIs
Publication statusPublished - Sep 2019

Fingerprint

Eichhornia
Nanoparticles
stabilization
Iron
Stabilization
Aging of materials
iron
Waste Water
Particle Size
Particle size
particle size
Photoelectron Spectroscopy
liquid
Liquids
Antioxidants
X-Ray Diffraction
Wastewater treatment
Electron Scanning Microscopy
antioxidant
Spectrometry

Citation

Yi, Y., Wei, Y., Tsang, P. E., & Fang, Z. (2019). Aging effects on the stabilisation and reactivity of iron-based nanoparticles green synthesised using aqueous extracts of Eichhornia crassipes. Environmental Science and Pollution Research, 26(27), 28361-28371. doi: 10.1007/s11356-019-06006-z

Keywords

  • Nano zero-valent iron
  • Green synthesis
  • Eichhornia crassipes
  • Aging
  • Cr(VI)
  • Iron-based nanoparticles