Biochar-cadmium retention and its effects after aging with Hydrogen Peroxide (H2O2)

Alves, Bárbara Samartini Queiroz; Fernandes, Luiz Arnaldo; Southard, R. J.

doi:10.1016/j.heliyon.2021.e08476

Cited by 5 publications

(6 citation statements)

References 117 publications

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“…Finally, greenhouse plant uptake results did not follow lab isotherm results (Alves et al 2021a). In the lab, the Cd-retention order was SSB 700 > CSB 600 -m2 > ASB 500-1 > CSB 600 -m3 > WSB 900 treatments.…”

Section: Plant Yield and Uptakementioning

confidence: 81%

“…Each pot was lled by volume (3.8 L of soil + treatment) using a graduated cylinder with the subsequent addition of 100 mg/dm 3 of P and 126.23 mg/dm 3 of K as KH 2 PO 4 as a starter fertilizer. Two non-simultaneous batches were conducted: 1) with the ve best biochars pre-tested by adsorption isotherms for Cd retention, and 2) with their corresponding oxidized versions also pre-tested in the lab (Alves et al 2021a). Each batch consisted of 13 treatments: the ve biochars added to the soil at application rates of 1 and 5% v/v (10 biochar treatments), soil + 25 mg/kg of Zn (ZnCl 2 ), soil + compost (5% v/v), and one control of non-amended soil.…”

Section: Biochar Acquisition Selection and Characterizationmentioning

confidence: 99%

“…Biochar acquisition, selection, and characterization were described elsewhere (Alves et al 2021a). Five biochars pre-tested in our laboratory for maximum Cd retention were selected for the greenhouse trials.…”

Section: Biochar Acquisition Selection and Characterizationmentioning

confidence: 99%

“…With the oxidation with H 2 O 2 the majority of the biochars had their pH reduced, except for the WSB 900 H 2 O 2 treatment that despite having its pH reduced, continued to be alkaline. For example, the CSB 600 -m2 H 2 O 2 biochar had its pH reduced from 7.05 to 4.02 (Alves et al 2021a). Thus, apart from WSB 900 H 2 O 2 5% treatment that had pH signi cantly higher after all harvests, in comparison to the control, most of the other treatments had pH bellow the control (full data in Table 3 -SI).…”

Section: Soil Propertiesmentioning

confidence: 99%

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Effects of Unoxidized Biochars, Oxidized Biochars, Zinc and Compost on Cadmium Uptake in Spinach

Alves,

Fernandes,

Southard

2024

Preprint

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Cadmium (Cd) is a toxic element that can be consumed by humans through food, posing a public health problem. Application to soil of zinc chloride (ZnCl2), and amendments, such as compost and biochar, have been proposed as solutions to prevent Cd from entering the food chain. Biochar is a stable carbon-rich charcoal that is produced by an eco-friendly method. The objective of this research was to compare the effectiveness of the treatments as remediation materials for an agricultural soil enriched with Cd. Pot experiments were conducted with spinach and soil material collected in the Salinas Valley of California, for three consecutive life-cycles of spinach. We utilized five biochars (pre-selected in laboratory) in their unoxidized and oxidized (with hydrogen peroxide - H2O2) versions, at application rates of 1% and 5% by volume. Cd uptake by spinach was compared to uptake in soil alone (control), soil + 25 mg/kg Zn, and soil + 5% poultry litter compost by volume. Compared to the control, some biochars significantly reduced Cd uptake and increased yield. Compost was also a successful amendment and may be the most cost-beneficial for farmers, although biochar produces carbon credits. The Zn treatment generally reduced Cd uptake, but also reduced yield. To achieve uptake values close to the CODEX limit (4 mg/kg dry wt.) it is necessary to lime all treatments to approximately pH 7. The oxidation of biochars with H2O2 did not decrease Cd uptake.

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Section: Plant Yield and Uptakementioning

confidence: 81%

Section: Biochar Acquisition Selection and Characterizationmentioning

confidence: 99%

Section: Biochar Acquisition Selection and Characterizationmentioning

confidence: 99%

Section: Soil Propertiesmentioning

confidence: 99%

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Effects of Unoxidized Biochars, Oxidized Biochars, Zinc and Compost on Cadmium Uptake in Spinach

Alves,

Fernandes,

Southard

2024

Preprint

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“…Unmodified AB AB + High Fe AB + Low Fe AB + High Mg AB + Low Mg capacity is assumed to increase continuously with no adsorption maximum [55,56]. The distinct presence of Mg(OH)2 granules in Mg-loaded AB (Figure 2) may explain the heterogenous nature of the surface and the better fitting with the Freundlich model.…”

Section: Initial Solution Phmentioning

confidence: 99%

Iron and Magnesium Impregnation of Avocado Seed Biochar for Aqueous Phosphate Removal

et al. 2022

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There has been increasing interest in using biochar for nutrient removal from water, and its application for anionic nutrient removal such as in phosphate (PO43−) necessitates surface modifications of raw biochar. This study produced avocado seed biochar (AB), impregnated Fe- or Mg-(hydr)oxide onto biochar (post-pyrolysis), and tested their performance for aqueous phosphate removal. The Fe- or Mg-loaded biochar was prepared in either high (1:8 of biochar to metal salt in terms of mass ratio) or low (1:2) loading rates via the co-precipitation method. A total of 5 biochar materials (unmodified AB, AB + High Fe, AB + Low Fe, AB + High Mg, and AB + Low Mg) were characterized according to their selected physicochemical properties, and their phosphate adsorption performance was tested through pH effect and adsorption isotherm experiments. Fe-loaded AB contained Fe3O4, while Mg-loaded AB contained Mg(OH)2. The metal (hydr)oxide inclusion was higher in Fe-loaded AB. Mg-loaded AB showed a unique free O–H functional group, while Fe-loaded AB showed an increase in its specific surface area more than 10-times compared to unmodified AB (1.8 m2 g−1). The effect of the initial pH on phosphate adsorption was not consistent between Fe-(anion adsorption envelope) vs. Mg-loaded AB. The phosphate adsorption capacity was higher with Fe-loaded AB in low concentration ranges (≤50 mg L−1), while Mg-loaded AB outperformed Fe-loaded AB in high concentration ranges (75–500 mg L−1). The phosphate adsorption isotherm by Fe-loaded AB fit well with the Langmuir model (R2 = 0.91–0.96), indicating the adsorptive surfaces were relatively homogeneous. Mg-loaded biochar, however, fit much better with Freundlich model (R2 = 0.94–0.96), indicating the presence of heterogenous adsorptive surfaces. No substantial benefit of high loading rates in metal impregnation was found for phosphate adsorption. The enhanced phosphate removal by Mg-loaded biochar in high concentration ranges highlights the important role of the chemical precipitation of phosphate associated with dissolved Mg2+.

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Enhancing Cd (II) immobilization with thiol-modified low-temperature pyrolysis biochar: Efficiency, mechanism, and applications

Xiang,

Wang,

Rao

et al. 2024

Journal of Environmental Chemical Engineering

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Biochar-cadmium retention and its effects after aging with Hydrogen Peroxide (H2O2)

Abstract: Biochars-Cd adsorption capacity varied from 0.67 to 415.67 mg/g. Feedstock seems to play a more important role than temperature when predicting Cd retention. Ash, sulfur, nitrogen and carbon content were the most important properties for predicting Cd retention.

Cited by 5 publications

References 117 publications

Effects of Unoxidized Biochars, Oxidized Biochars, Zinc and Compost on Cadmium Uptake in Spinach

Effects of Unoxidized Biochars, Oxidized Biochars, Zinc and Compost on Cadmium Uptake in Spinach

Iron and Magnesium Impregnation of Avocado Seed Biochar for Aqueous Phosphate Removal

Enhancing Cd (II) immobilization with thiol-modified low-temperature pyrolysis biochar: Efficiency, mechanism, and applications

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