Effects of an additive (hydroxyapatite–bentonite–biochar) on Cd and Pb stabilization and microbial community composition in contaminated vegetable soil

Zhang, Di; Li, Ting; Ding, Aifang; Wu, Xiaohu

doi:10.1039/d1ra00565k

Cited by 11 publications

(2 citation statements)

References 49 publications

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“…This was confirmed in an earlier study by Nartowska and Kozłowski [ 47 ], which showed that, in bentonites contaminated with Cu ions, the presence of a new mineral phase, atacamite, increased in proportion with increasing Cu ion concentration. The possible formation of metal compounds, resulting in a reduction in metal mobility, was also reported by Zhang et al [ 64 ]. According to the authors, higher soil pH may promote the adsorption of positively charged heavy metal ions by soil colloids and may increase ion binding with OH − groups.…”

Section: Resultssupporting

confidence: 58%

Mobility of Zn and Cu in Bentonites: Implications for Environmental Remediation

Nartowska,

Podlasek,

Vaverková

et al. 2024

Materials

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The aim of this study was to evaluate the mobility of copper (Cu) and zinc (Zn) and their impact on the properties of bentonites and unfrozen water content. Limited research in this area necessitates further analysis to prevent the negative effects of metal interactions on bentonite effectiveness. Tests involved American (SWy-3, Stx-1b) and Slovak (BSvk) bentonite samples with Zn or Cu ion exchange. Sequential extraction was performed using the Community Bureau of Reference (BCR) method. Elemental content was analyzed via inductively coupled plasma optical emission spectrometry (ICP-OES). Unfrozen water content was measured using nuclear magnetic resonance (1H-NMR) and differential scanning calorimetry (DSC). Results showed a significant influence of the main cation (Zn or Cu) on ion mobility, with toxic metal concentrations increasing mobility and decreasing residual fractions. Mobile Zn fractions increased with larger particle diameters, lower clay content, and shorter interplanar spacing, while the opposite was observed for Cu. Zn likely accumulated in larger clay pores, while Cu was immobilized in the bentonite complex. The stability of Zn or Cu ions increased with higher clay content or specific surface area. Residual Zn or Cu fractions were highest in uncontaminated bentonites with higher unfrozen water content, suggesting the potential formation of concentrated solutions in sub-zero temperatures, posing a threat to the clay–water environment, especially in cold regions.

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Section: Resultssupporting

confidence: 58%

Mobility of Zn and Cu in Bentonites: Implications for Environmental Remediation

Nartowska,

Podlasek,

Vaverková

et al. 2024

Materials

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“…A feasible soil amendment is essential for chemical remediation technology and has attracted increasingly widespread attention. Various amendments, including in-organic materials (lime, phosphate compounds, and clay minerals) and organic mate-rials (biochar, manure, organic fertilizer), have been successfully used to decrease the bioavailability of Cd and Pb during in situ chemical immobilization [4,15]. For example, hydroxyapatite is considered an effective soil amendment for the remediation of Cd and Pb contaminated soils, due to its small size and high specific surface area [16,12].…”

Section: Introductionmentioning

confidence: 99%

Effects of Soil Amendments Applied on Cd and Pb Immobilization and Environmental Risks under Simulated Acid Rain

Zhang¹,

Li²,

Wang³

2022

Pol. J. Environ. Stud.

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A column leaching experiment was conducted to study the long-term remediation stability of hydroxyapatite, sepiolite, and biochar on soil Cd and Pb under simulated acid rain. The results indicated that simulated acid rain reduced soil pH and facilitated the conversion of residual fractions of Cd and Pb to acid-soluble fractions, thus increasing solubility, mobility, and availability of soil Cd and Pb. Lower leachate Cd and Pb contents were found in hydroxyapatite-treated soil than were found in sepiolite and biochar-treated soils. Meanwhile, Cd and Pb concentrations in hydroxyapatite met grade IV (Cd≤0.01 mg L -1 , Pb≤0.1 mg L -1 ) at the end of leaching (48 weeks), according to the Environmental quality standards for groundwater in China (GB14848-93). The application of hydroxyapatite, sepiolite, and biochar effectively immobilized Cd and Pb in both the water and simulated acid rain treatments. The immobilization efficiencies of Cd treated by hydroxyapatite, sepiolite, and biochar were 37.97~43.55%, 21.52~25.81%, and 26.58~33.87%, respectively, after the long-term leaching experiment. For Pb, these values were 36.35~48.65%, 24.90~29.26%, and 20.91~22.41%, respectively. Hydroxyapatite has better immobilization efficiency and maintains stronger and more durable stability than sepiolite and biochar. Therefore, hydroxyapatite is recommended to use in the remediation of Cd and Pb-contaminated agricultural soils under the condition of soil acidification.

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Synthesis and application of starch-stablized Fe–Mn/biochar composites for the removal of lead from water and soil

et al. 2022

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Effects of an additive (hydroxyapatite–bentonite–biochar) on Cd and Pb stabilization and microbial community composition in contaminated vegetable soil

Abstract: A two-year pot experiment was conducted with an amendment of hydroxyapatite, bentonite and biochar combinations (HTB) to study the influence of HTB on soil physicochemical properties, soil Cd and Pb availability and microbial community composition.

Cited by 11 publications

References 49 publications

Mobility of Zn and Cu in Bentonites: Implications for Environmental Remediation

Mobility of Zn and Cu in Bentonites: Implications for Environmental Remediation

Effects of Soil Amendments Applied on Cd and Pb Immobilization and Environmental Risks under Simulated Acid Rain

Synthesis and application of starch-stablized Fe–Mn/biochar composites for the removal of lead from water and soil

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