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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60460709%3A41310%2F23%3A97256" target="_blank" >RIV/60460709:41310/23:97256 - isvavai.cz</a>

Alternative codes found

RIV/60460709:41330/23:97256

Result on the web

<a href="http://dx.doi.org/10.1039/d3en00429e" target="_blank" >http://dx.doi.org/10.1039/d3en00429e</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/d3en00429e" target="_blank" >10.1039/d3en00429e</a>

Result language

angličtina

Original language name

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

Original language description

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 for 1, 3, 12, and 15 months with i) biochar (BC), ii) nano zero-valent iron (nZVI), and iii) a composite of nZVI and BC (nZVI-BC). Two experimental designs were realised: i) mixing of the soil with the amendments and ii) applying the amendments as a layer between the soil and silica sand. With this dual approach, both the immobilisation efficiency and the solid phase transformations of the amendments were investigated under the effect of time. Solid-state (SEM/EDS, XAS, XRD) and liquid phase (pore water sampling, soil extractions) analyses were employed for a holistic assessment of the amendments. The three tested amendments demonstrated different efficiencies for metal(loid) immobilisation in this soil. Biochar and nZVI-BC were mostly efficient for long-term immobilisation, especially for Zn and Cd, while the efficiency of nZVI was instant but rather short-term and preferably towards Pb and As. The oxidation of nZVI was not directly proportional to time, and the nZVI products, such as lepidocrocite, ferrihydrite, and magnetite, were identified in the same proportions regardless of Fe0 oxidation. Implications of natural attenuation were also noticed in the control soil. However, enhancement of the contaminated soil with amendments is still recommended since the important metal(loid) scavengers (Fe and/or Mn oxides) in the soil occurred at least 2x more often after the amendment application. Immobilisation of Zn, Pb, Cd, and As was achieved in smelting-affected soil showing changes over time. The oxidation of Fe0 was not directly proportional with time.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10511 - Environmental sciences (social aspects to be 5.7)

Project

<a href="/en/project/GC21-23794J" target="_blank" >GC21-23794J: Performance comparison of innovative metal(loid) nanosorbents in smelter-polluted soils: Geochemical and ecotoxicological benchmarks</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Environmental Science-Nano

ISSN

2051-8153

e-ISSN

2051-8153

Volume of the periodical

10

Issue of the periodical within the volume

10

Country of publishing house

GB - UNITED KINGDOM

Number of pages

19

Pages from-to

2861-2879

UT code for WoS article

001078308100001

EID of the result in the Scopus database

2-s2.0-85172184235