Issue 5, 2024

Magnetic and structural characteristics associated with the transformation of As(v)-coprecipitated ferrihydrite to hematite: implications for magnetic enhancement in soils and sediments

Abstract

The transformation of metastable ferrihydrite to stable hematite has been linked to magnetic enhancement in soils and sediments. However, the magnetic and structural characteristics associated with the transformation of arsenate (As(V))-coprecipitated ferrihydrite to hematite remain unclear. Herein, we have investigated the structural and magnetic characteristics of fresh and aged As(V)-ferrihydrite coprecipitates. Magnetic characterization indicates that the high As(V) loading weakens the ferrimagnetic susceptibility of fresh Fe–As(V) coprecipitates by forming Fe–AsO4 complexes. In the low As(V)-loading system (Fe/As(V) ≥ 40), the increase in As(V) concentrations accelerates the growth of hematite particles with an expanded unit cell parameter c, and enhances magnetic susceptibility by changing both the surficial and internal lattice arrangements of hematite crystallites. In contrast, in the high As(V)-loading system (Fe/As(V) ≤ 20), the transformation of ferrihydrite is greatly retarded and the formation of poorly crystalline ferrimagnetic maghemite significantly enhances the magnetic susceptibility in the transformation products. Our findings provide new insights into the enhancement of magnetic properties of iron (oxyhydr)oxides in high arsenic soils and sediments, which are also essential for developing effective immobilization and long-term storage strategies for arsenic using iron (oxyhydr)oxides.

Graphical abstract: Magnetic and structural characteristics associated with the transformation of As(v)-coprecipitated ferrihydrite to hematite: implications for magnetic enhancement in soils and sediments

Supplementary files

Article information

Article type
Paper
Submitted
18 окт. 2023
Accepted
11 апр. 2024
First published
12 апр. 2024

Environ. Sci.: Nano, 2024,11, 1985-1999

Magnetic and structural characteristics associated with the transformation of As(V)-coprecipitated ferrihydrite to hematite: implications for magnetic enhancement in soils and sediments

G. Zhang, Y. Tang, J. Lin, J. Xu, Z. Yuan, L. Chen, F. Wu, C. Liu, Z. Zhu, X. Bi, W. Zou, Z. Cao, K. Jiang, Y. Pan, R. Chernikov, Y. Jia and S. Wang, Environ. Sci.: Nano, 2024, 11, 1985 DOI: 10.1039/D3EN00739A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements