Revealing the long-term behaviour of nZVI and biochar in metal(loid)-contaminated soil: focus on Fe transformations

Mitzia, Aikaterini; Vítková, Martina; Ratié, Gildas; Chotěborský, Rostislav; Vantelon, Delphine; Neaman, Alexander; Komárek, Michael

doi:10.1039/d3en00429e

Cited by 7 publications

(1 citation statement)

References 103 publications

(198 reference statements)

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“…Consequently, previously sorbed metal(loid)s may be released, increasing their leaching over time (Danila et al, 2020). Nonetheless, it had been reported that nZVI oxidation is not directly proportional to time and the coexistence of poorly crystalline (i.e., ferrihydrite) and more crystalline (i.e., magnetite, lepidocrocite, goethite) Fe (oxyhydr)oxides is possible (Mitzia et al, 2023). The additional reaction mechanism between S-nZVI and metal (loid)s involves sulfide formation, i.e., the substitution of Fe in FeS to form metal(loid) sulfides, which are very stable implying that the immobilized metal(loid)s are not likely to be released into solution again.…”

Section: Metal Bioavailability In the Treated Soilsmentioning

confidence: 99%

Future Role of Sustainable Innovative Technologies in Crisis Management

2022

Advances in Electronic Government, Digital Divide, and Regional Development

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organic matter content (TOC = 2.3 %), the results were mixed; 0.01 M CaCl 2 extraction data showed only S-nZVI with sludge as remaining effective in reducing extractable concentrations of metals; on the other hand, Cd and Zn concentrations were increased in the extracted soil pore water solutions, in contrast to the two conventional amendments. Despite that, S-nZVI with sludge enhanced the quantity of microbial biomass in this soil. Additional earthworm avoidance data indicated that they generally avoided soil treated with all Fe-based materials, but the presence of sludge impacted their preferences somewhat. In summary, no significant differences between S-nZVI and iron grit were observed for metal(loid) immobilization, though sludge significantly improved the performance of S-nZVI in terms of soil health indicators. Therefore, this study indicates that S-nZVI amendment of soils alone should be avoided, though further field evidence from a broader range of soils is now required.

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Section: Metal Bioavailability In the Treated Soilsmentioning

confidence: 99%

Future Role of Sustainable Innovative Technologies in Crisis Management

2022

Advances in Electronic Government, Digital Divide, and Regional Development

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In Situ Immobilization of Potentially Toxic Elements in Arable Soil by Adding Soil Amendments and the Best Ways to Maximize Their Use Efficiency

Lwin,

Kim,

Lee

et al. 2024

J Soil Sci Plant Nutr

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Biochar-supported zero-valent iron enhanced arsenic immobilization in a paddy soil: the role of soil organic matter

Wang,

Li,

Ding

et al. 2024

Biochar

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Arsenic (As) detoxification in polluted soils by iron-based materials can be mediated by the endogenous soil organic matter (SOM), nevertheless the mechanisms remain unclear. Herein, endogenous SOM in a paddy soil was substantially removed to understand its roles on As immobilization by biochar-supported zero-valent iron (ZVI/BC). The results demonstrated that ZVI/BC application significantly decreased As bioavailability by 64.2% compared with the control soil under the anaerobic condition. XPS and HR-TEM suggested As immobilization by ZVI/BC mainly invoked the formation of ternary complexes (i.e., As-Fe-SOM). However, SOM depletion compromised the efficacy of ZVI/BC for As immobilization by 289.8%. This is likely because SOM depletion increased the fulvic acid and OH− contents in soils. Besides, ZVI/BC increased the proportion of As(III) in available As fraction, but SOM depletion altered the mechanisms associated with As(V) reduction. That is, As(V) reduction resulted from the reductive capacity of ZVI in the pristine soil, but the As(V)-reducing bacteria contributed greater to As(V) reduction in the SOM-depleted soil. Additionally, SOM depletion boosted the abundances of Fe(III)- and As(V)-reducing bacteria such as Bacillus and Ammoniphilus in soils, which enhanced the dissimilatory arsenate reduction. Thus, this work highlighted the importance of SOM in the remediation of As-contaminated soils by ZVI/BC. Graphical Abstract

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Revealing the long-term behaviour of nZVI and biochar in metal(loid)-contaminated soil: focus on Fe transformations

Abstract: The long-term behaviour of stabilising amendments for soil remediation is rarely being tested. Therefore, we conducted time-dependent experiments using contaminated soil from a post-mining area. The soil was individually incubated...

Cited by 7 publications

References 103 publications

Future Role of Sustainable Innovative Technologies in Crisis Management

Future Role of Sustainable Innovative Technologies in Crisis Management

In Situ Immobilization of Potentially Toxic Elements in Arable Soil by Adding Soil Amendments and the Best Ways to Maximize Their Use Efficiency

Biochar-supported zero-valent iron enhanced arsenic immobilization in a paddy soil: the role of soil organic matter

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