Zeolite-supported nanoscale zero-valent iron for immobilization of cadmium, lead, and arsenic in farmland soils: Encapsulation mechanisms and indigenous microbial responses
- Authors
- Li, Zhangtao; Wang, Lu; Wu, Jizi; Xu, Yan; Wang, Fan; Tang, Xianjin; Xu, Jianming; Ok, Yong Sik; Meng, Jun; Liu, Xingmei
- Issue Date
- May-2020
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Nanoscale zero-valent iron; Metal(loid)s; Soil remediation; Encapsulation mechanism; Bacterial community
- Citation
- ENVIRONMENTAL POLLUTION, v.260
- Indexed
- SCIE
SCOPUS
- Journal Title
- ENVIRONMENTAL POLLUTION
- Volume
- 260
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/56067
- DOI
- 10.1016/j.envpol.2020.114098
- ISSN
- 0269-7491
- Abstract
- Zeolite-supported nanoscale zero-valent iron (Z-NZVI) has great potential for metal(loid) removal, but its encapsulation mechanisms and ecological risks in real soil systems are not completely clear. We conducted long-term incubation experiments to gain new insights into the interactions between metal(loid) s (Cd, Pb, As) and Z-NZVI in naturally contaminated farmland soils, as well as the alteration of indigenous bacterial communities during soil remediation. With the pH-adjusting and adsorption capacities, 30 g kg(-1) Z-NZVI amendment significantly decreased the available metal(loid) concentrations by 10.2-96.8% and transformed them into strongly-bound fractions in acidic and alkaline soils after 180 d. An innovative magnetic separation of Z-NZVI from soils followed by XRD and XPS characterizations revealed that B-type ternary complexation, heterogeneous coprecipitation, and/or concurrent redox reactions of metal(loid)s, especially the formation of Cd-3(AsO4)(2), PbFe2(AsO4)2(OH)(2), and As-0, occurred only under specific soil conditions. Sequencing of 16S rDNA using Illumina MiSeq platform indicated that temporary shifts in iron-resistant/sensitive, pH-sensitive, denitrifying, and metal-resistant bacteria after Z-NZVI addition were ultimately eliminated because soil characteristics drove the re-establishment of indigenous bacterial community. Meanwhile, Z-NZVI recovered the basic activities of bacterial DNA replication and denitrification functions in soils. These results confirm that Z-NZVI is promising for the long-term remediation of metal(loid)s contaminated farmland soil without significant ecotoxicity. (C) 2020 Elsevier Ltd. All rights reserved.
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Collections - College of Life Sciences and Biotechnology > Division of Environmental Science and Ecological Engineering > 1. Journal Articles
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