Open Access

ARTICLE

Rapid Immobilization of Transferable Ni in Soil by Fe₇₈Si₉B₁₃ Amorphous Zero-Valent Iron

by Liefei Pei, Xiangyun Zhang, Zizhou Yuan^*

School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, China

* Corresponding Author: Zizhou Yuan. Email:

(This article belongs to the Special Issue: New Insights on Nanomaterials for Energy, Environmental and Agricultural Applications)

Journal of Renewable Materials 2022, 10(4), 955-968. https://doi.org/10.32604/jrm.2022.016961

Received 11 April 2021; Accepted 15 June 2021; Issue published 02 November 2021

Abstract

Fe-Si-B amorphous zero-valent iron has attracted wide attention because of its efficient remediation of heavy metals and dye wastewater. In this paper, the remediation effect of amorphous zero-valent iron powder (Fe₇₈Si₉B₁₃^AP) on Ni contaminated soil was investigated. Results show that the immobilization efficiency of nickel in soil by Fe₇₈Si₉B₁₃^AP with low iron content is higher than that by ZVI. The apparent activation energies of the reactions of Fe₇₈Si₉B₁₃^AP with Ni²⁺ ions is 25.31 kJ/mol. After continuing the reaction for 7 days, Ni²⁺ ions is mainly transformed into monoplasmatic nickel (Ni⁰) and nickel combined with iron (hydroxide) oxides. Microstructure investigations show that the product layer with nano-pore structure is beneficial to improve the reaction activity of Fe₇₈Si₉B₁₃^AP. After that, a magnetic separation process is introduced, in which part of the immobilized Ni are removed to reduce the total Ni content in soil by 58.21%. The results of simulated acid rain leaching experiment showed that the release of Ni in the soil after Fe₇₈Si₉B₁₃^AP remediation is 62.89% lower than that before remediation.

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Keywords

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