Synergistic immobilization of potentially toxic elements (PTEs) by biochar and nanoparticles in alkaline soil

Matin, Narges Hemati; Jalali, Mohsen; Buss, Wolfram

doi:10.1016/j.chemosphere.2019.124932

Cited by 32 publications

(8 citation statements)

References 78 publications

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“…This effect cannot be attributed to an increase in pH, which has been suggested as one of the main mechanisms of PTE immobilization by biochar, since the soil pH was higher than the biochar pH. This phenomenon was recently documented [50]. Yue et al [15] pointed out that the precipitation of PTEs by inorganic components of biochar, including carbonates, oxides, and phosphates contributes to the increase of pertinent fractions of PTEs in the biochar-amended soil.…”

Section: Discussionmentioning

confidence: 99%

Pyrolysis Treatment Enables Safe Application of Sewage Sludge in Horticulture – Tracking Potentially Toxic Elements Through the Biochar-Soil-Plant System in Tomato

Tahervand

Jalali

Buss

2021

Preprint

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Biochar production via pyrolysis is a promising option to be used for sewage sludge treatment. Here we investigated the uptake of potentially toxic elements (PTEs) from sewage sludge and its biochar (450°C) into cherry tomato plants and its fruits in pot experiments (2, 5 and 10%) to assess the health risks associated with fruit consumption. We further studied the ability of the PTE-rich amendments to immobilize PTEs already present in soil through spiking of soil (pH 7.4) with Cd, Cu and Zn. Our findings suggest that tomato consumption is not a human health risk when grown in soil amended with sewage sludge and its biochar; in most treatments PTE uptake into fruits was similar to the control. Vegetative plant growth was highest in sewage sludge-amended soils. Yet 5 and 10% biochar-amended soils significantly increased tomato fruit yield compared to untreated sewage sludge application (400–500% higher than 10% sewage sludge-amended soil) and significantly decreased fruit uptake of Cu and Zn. Importantly, biochar also significantly immobilized PTEs present in contaminated (spiked) soil. As expected, available (DTPA-extractable) PTE contents were typically lower in biochar-amended soil and sequential extraction indicated that the PTEs were predominantly bound in more recalcitrant soil fractions (organic matter associated and Fe-Mn oxides-bound). We conclude that pyrolysis can be a key technology for sewage sludge treatment and subsequent use of the biochar in urban, and potentially even contaminated, horticultural sites.

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Section: Discussionmentioning

confidence: 99%

Pyrolysis Treatment Enables Safe Application of Sewage Sludge in Horticulture – Tracking Potentially Toxic Elements Through the Biochar-Soil-Plant System in Tomato

Tahervand

Jalali

Buss

2021

Preprint

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“…Hybrid modification with reductive metal material, such as nZVI, promoted the immobilization of Cr(VI) by biochar via enhanced reduction and electron shuttle [109,226,227]. The introduction of clay nanoparticle enhanced the Cr(VI) immobilization capacity of biochar by providing active adsorption sites in alkaline soil [228]. In addition to direct impact on soil properties, the supplementation of biochar influenced the activity of microbe and plant, thereby assisting the immobilization of Cr in soil indirectly [220].…”

Section: Biochar-assisted Cr Immobilization Changes the Properties Of...mentioning

confidence: 99%

Application of biochars in the remediation of chromium contamination: Fabrication, mechanisms, and interfering species

Zheng

Yang

et al. 2021

Journal of Hazardous Materials

115

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“…This comes in contrast with the established trend described earlier. The authors attributed their observation to the strong sorption of Zn on the composites’ surface [ 200 ].…”

Section: Effect Of Biochar On Specific Potentially Toxic Elements Mobility and Bioavailabilitymentioning

confidence: 99%

Towards a Soil Remediation Strategy Using Biochar: Effects on Soil Chemical Properties and Bioavailability of Potentially Toxic Elements

Bilias

Nikoli

Kalderis

et al. 2021

Toxics

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Soil contamination with potentially toxic elements (PTEs) is considered one of the most severe environmental threats, while among remediation strategies, research on the application of soil amendments has received important consideration. This review highlights the effects of biochar application on soil properties and the bioavailability of potentially toxic elements describing research areas of intense current and emerging activity. Using a visual scientometric analysis, our study shows that between 2019 and 2020, research sub-fields like earthworm activities and responses, greenhouse gass emissions, and low molecular weight organic acids have gained most of the attention when biochar was investigated for soil remediation purposes. Moreover, biomasses like rice straw, sewage sludge, and sawdust were found to be the most commonly used feedstocks for biochar production. The effect of biochar on soil chemistry and different mechanisms responsible for PTEs’ immobilization with biochar, are also briefly reported. Special attention is also given to specific PTEs most commonly found at contaminated soils, including Cu, Zn, Ni, Cr, Pb, Cd, and As, and therefore are more extensively revised in this paper. This review also addresses some of the issues in developing innovative methodologies for engineered biochars, introduced alongside some suggestions which intend to form a more focused soil remediation strategy.

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Synergistic immobilization of potentially toxic elements (PTEs) by biochar and nanoparticles in alkaline soil

Cited by 32 publications

References 78 publications

Pyrolysis Treatment Enables Safe Application of Sewage Sludge in Horticulture – Tracking Potentially Toxic Elements Through the Biochar-Soil-Plant System in Tomato

Pyrolysis Treatment Enables Safe Application of Sewage Sludge in Horticulture – Tracking Potentially Toxic Elements Through the Biochar-Soil-Plant System in Tomato

Application of biochars in the remediation of chromium contamination: Fabrication, mechanisms, and interfering species

Towards a Soil Remediation Strategy Using Biochar: Effects on Soil Chemical Properties and Bioavailability of Potentially Toxic Elements

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