Remobilization of Cd caused by iron oxide phase transformation and Mn2+ competition after stabilization by nano zero valent iron

Mengjiao Liu; Xiya Wang; Sheng Tang; Jingjie Zhou; Longfei Liu; Qingxu Ma; Lianghuan Wu; Meng Xu

doi:10.1016/j.chemosphere.2023.141091

Remobilization of Cd caused by iron oxide phase transformation and Mn²⁺ competition after stabilization by nano zero valent iron

Chemosphere. 2024 Feb:350:141091. doi: 10.1016/j.chemosphere.2023.141091. Epub 2024 Jan 1.

Authors

Mengjiao Liu¹, Xiya Wang², Sheng Tang³, Jingjie Zhou³, Longfei Liu⁴, Qingxu Ma³, Lianghuan Wu⁵, Meng Xu⁶

Affiliations

¹ State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, the Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, China; Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture and Rural Affairs, Beijing, 100081, China; Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China.
² State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, the Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, China; Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture and Rural Affairs, Beijing, 100081, China.
³ Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China.
⁴ College of Environmental Science and Engineering, Yangzhou University, Yangzhou, 225127, China.
⁵ Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China. Electronic address: finm@zju.edu.cn.
⁶ State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, the Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, China; Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture and Rural Affairs, Beijing, 100081, China; Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China. Electronic address: xumeng@caas.cn.

PMID: 38171399
DOI: 10.1016/j.chemosphere.2023.141091

Abstract

Stabilization techniques are vital in controlling Cd soil pollution. Nano zero valent iron (nZVI) has been extensively utilized for Cd remediation owing to its robust adsorption and reactivity. However, the environmental stress-induced stability of Cd after nZVI addition remains unclear. A pot experiment was conducted to evaluate the Cd bioavailability in continuously flooded (130 d) soil after stabilization with nZVI. The findings indicated that nZVI application did not result in a decline in Cd concentration in rice, as compared to the no-nZVI control. Additionally, nZVI simultaneously increased the available Cd concentration, iron-manganese oxide-bound (OX) Mn fraction, and relative abundance of Fe(III)-reducing bacteria, but it decreased OX-Cd and Mn availability in soil. Cadmium in rice tissues was positively correlated with the available Cd in soil. The results of subsequent adsorption tests demonstrated that CdO was the product of Cd adsorption by the nZVI aging products. Conversely, Mn²⁺ decreased the adsorption capacity of Cd-containing solutions. These results underscore the crucial role of both biotic and abiotic factors in undermining the stabilization of nZVI under continuous flooding conditions. This study offers novel insights into the regulation of nZVI-mediated Cd stabilization efficiency in conjunction with biological inhibitors and functional modification techniques.

Keywords: Cd remobilization; Cd stabilization; Competitive adsorption; Iron oxides transformation; Mn(2+).

MeSH terms

Cadmium / analysis
Environmental Restoration and Remediation*
Ferric Compounds
Iron
Soil
Soil Pollutants* / analysis

Substances

Iron
ferric oxide
Ferric Compounds
Cadmium
Soil
Soil Pollutants