Enhanced Cd(II) immobilization in sediment with zero-valent iron induced by hydrogenotrophic denitrification

Ying Chen; Weiquan Li; Huaitian Bu; Weizhao Yin; Ping Li; Zhanqiang Fang; Jinhua Wu

doi:10.1016/j.jhazmat.2022.129833

Enhanced Cd(II) immobilization in sediment with zero-valent iron induced by hydrogenotrophic denitrification

J Hazard Mater. 2023 Jan 5:441:129833. doi: 10.1016/j.jhazmat.2022.129833. Epub 2022 Aug 24.

Authors

Ying Chen¹, Weiquan Li¹, Huaitian Bu², Weizhao Yin³, Ping Li¹, Zhanqiang Fang⁴, Jinhua Wu⁵

Affiliations

¹ School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
² SINTEF Industry, Department of Materials and Nanotechnology, Forskningsveien 1, 0373 Oslo, Norway.
³ School of Environment, Jinan University, Guangzhou 510632, China.
⁴ School of Environment, South China Normal University, Guangzhou 510006, China.
⁵ School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China; The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, Guangzhou 510006, China. Electronic address: jinhuawu@scut.edu.cn.

PMID: 36084458
DOI: 10.1016/j.jhazmat.2022.129833

Abstract

In this study, an integrated system of Fe⁰ and hydrogenotrophic microbes mediated by nitrate (nitrate-mediated bio-Fe⁰, NMB-Fe⁰) was established to remediate Cd(II)-contaminated sediment. Solid phase characterization confirmed that aqueous Cd(II) (Cd(II)_aq) was successfully immobilized and enriched on iron surface due to promoted iron corrosion driven by hydrogenotrophic denitrification and subsequent greater biomineral production such as magnetite, lepidocrocite and green rust. Compared to a Cd(II)_aq removal of 21.1% in overlying water of the nitrate-mediated Fe⁰ (NM-Fe⁰) system, the NMB-Fe⁰ system obtained a much higher Cd(II)_aq removal of 83.1% after 7 d remediation. The leaching test and sequential extraction results also showed that the leachability of Cd(II) decreased by 75.9% while the residual fraction of Cd(II) increased by 185.7% in comparison with untreated sediment. Besides, the Cd(II)_aq removal raised with the increase of nitrate concentration and Fe⁰ dosage, further revealing the promotion effect of nitrate on Cd(II) removal by bio-Fe⁰. This study highlighted the involvement of bio-denitrification in the remediation of Cd(II)-contaminated sediment by Fe⁰ and provided a new insight to enhance its reactivity and applicability for Cd(II) immobilization.

Keywords: Cadmium; Denitrification; Iron oxide; Sediment; Zero-valent iron.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Cadmium / pharmacology
Denitrification
Ferrosoferric Oxide / pharmacology
Iron* / pharmacology
Nitrates*
Water / pharmacology

Substances

Nitrates
Cadmium
Water
Iron
Ferrosoferric Oxide