Evolution of redox activity of biochar during interaction with soil minerals: Effect on the electron donating and mediating capacities for Cr(VI) reduction

Xu, Zibo; Xu, Xiaoyun; Yu, Yulu; Yao, Chengbo; Tsang, Daniel C.W.; Cao, Xinde

doi:10.1016/j.jhazmat.2021.125483

Cited by 67 publications

(21 citation statements)

References 81 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Clay minerals can be mined easily, non-toxic, lamellar structures, relatively low cost, and comparatively high surface area. In general, mineral modification encompasses impregnation of biochar with different minerals, such as birnessite , montmorillonite (Song et al 2020), kaolinite (Xu et al 2021b), hematite (Zhu et al 2020b), ferrihydrite (Huang et al 2020), and goethite (Zhu et al 2020c). Kashif Irshad et al (2020) investigated how different biochar (BC) and goethite-modified biochar (GB) modifications affect the mobility of Cd and transfer in the soil-rice structure.…”

Section: Biochar-based Compositesmentioning

confidence: 99%

Biochar for the removal of contaminants from soil and water: a review

Qiu

Liu

Ling

et al. 2022

Biochar

376

View full text Add to dashboard Cite

Biochar shows significant potential to serve as a globally applicable material to remediate water and soil owing to the extensive availability of feedstocks and conducive physio-chemical surface characteristics. This review aims to highlight biochar production technologies, characteristics of biochar, and the latest advancements in immobilizing and eliminating heavy metal ions and organic pollutants in soil and water. Pyrolysis temperature, heat transfer rate, residence time, and type of feedstock are critical influential parameters. Biochar’s efficacy in managing contaminants relies on the pore size distribution, surface groups, and ion-exchange capacity. The molecular composition and physical architecture of biochar may be crucial when practically applied to water and soil. In general, biochar produced at relatively high pyrolysis temperatures can effectively manage organic pollutants via increasing surface area, hydrophobicity and microporosity. Biochar generated at lower temperatures is deemed to be more suitable for removing polar organic and inorganic pollutants through oxygen-containing functional groups, precipitation and electrostatic attraction. This review also presents the existing obstacles and future research direction related to biochar-based materials in immobilizing organic contaminants and heavy metal ions in effluents and soil. Graphical Abstract

show abstract

Section: Biochar-based Compositesmentioning

confidence: 99%

Biochar for the removal of contaminants from soil and water: a review

Qiu

Liu

Ling

et al. 2022

Biochar

376

View full text Add to dashboard Cite

show abstract

“…However, if the biochar is designed for soil conditioning and fertility enhancement, its impact on the redox-induced transformation of PTEs needs further consideration based on the biochar properties such as surface functionality, carbon structure, particle size, and surface area. In addition, the newly-added biochar may have a different redox reactivity than the naturally occurring biochar, because the latter generally undergoes a long-term aging process with increasing O-functionalities and decreasing electron-donating capacities (Wang et al 2020c;Xu et al 2021c).…”

Section: Biocharmentioning

confidence: 99%

“…Owing to the rich mineral content in the soil, biochar is known to extensively combine with soil minerals (Yang et al 2016;Zhao and Zhou 2019), resulting in a variable electron transfer capacity and route (Xu et al 2021c(Xu et al , 2022b. The formation of an organo-mineral coating on the biochar surface can protect the carbon phase of biochar with a decrease in the redox reactivity (Jing et al 2022;Yang et al 2016).…”

Section: Biocharmentioning

confidence: 99%

“…Recently, pyrogenic carbon (e.g., biochar) from biomass burning in fields, which is rich in Amazonian dark earth, has garnered increasing attention owing to its high stability for long-term carbon sequestration (Lehmann 2007;Lehmann et al 2021). In addition, the porous structure, rich surface functionality, and condensed graphitic carbon of biochar offer outstanding capacity for the regulation of other soil properties, including the immobilization of pollutants (Gong et al 2022;Wang and Wang 2019;Xu et al 2021c) and fertility (Baki and Abedi-Koupai 2018;Marcińczyk and Oleszczuk 2022). In addition to naturally generated organic carbon, human activities might result in the introduction of some organic carbon in the soil, such as carbon-based materials for soil application, leading to further variations in soil properties (Marcińczyk and Oleszczuk 2022;Xie et al 2015).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Redox-induced transformation of potentially toxic elements with organic carbon in soil

Tsang

2022

carbon res

Self Cite

View full text Add to dashboard Cite

Soil organic carbon (SOC) is a crucial component that significantly affects the soil fertility, soil remediation, and carbon sequestration. Here, we review the redox-induced transformation of potentially toxic elements (PTEs) through the abiotic impact of SOC. The complex composition of SOC includes humus, pyrogenic carbon (e.g., biochar), dissolved organic matter, and anthropogenic carbon (e.g., compost), with varying concentrations and properties. The primary redox moieties on organic carbon are surface functionalities (e.g., phenol, quinone, and N/S-containing functional groups), environmentally persistent free radicals, and graphitic structures, and their contents are highly variable. Owing to these rich redox moieties, organic carbon can directly affect the reduction and oxidation of PTEs in the soil, such as Cr(VI) reduction and As(III) oxidation. In addition, the interactions between organic carbon and soil redox moieties (i.e., O2, Fe, and Mn minerals) cause the transformation of PTEs. The formation of reactive oxygen species, Fe(II), and Mn(III)/Mn(II) is the main contributor to the redox-induced transformation of PTEs, including Cr(VI) reduction and As(III)/Cr(III)/Tl(I) oxidation. We articulated both the positive and negative effects of organic carbon on the redox-induced transformation of PTEs, which could guide soil remediation efforts. Further scientific studies are necessary to better understand the potential transformations of PTEs by SOC, considering the complicated soil moieties, variable organic carbon composition, and both biotic and abiotic transformations of PTEs in the environment. Graphical Abstract

show abstract

“…Toxic heavy metal ions are very harmful to human health and environmental ecosystem (Wang et al, 2020;Liu et al, 2021), among which chromium-containing compounds are among the most ubiquitous contaminants (Kretschmer et al, 2019;Pei et al, 2020;Xu et al, 2021). Chromium commonly exists in the industrial waste and natural environment in the form of Cr(III) and Cr(VI) (Andrade et al, 2019;Qiu et al, 2020;Zhang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Optical Characterization, and Adsorption of Novel Hexavalent Chromium and Total Chromium Sorbent: A Fabrication of Mulberry Stem Biochar/Mn-Fe Binary Oxide Composite via Response Surface Methodology

Liang

Ding

et al. 2021

Front. Environ. Chem.

View full text Add to dashboard Cite

In this study, a new generation chromium sorbent, mulberry stem biochar/Mn-Fe binary oxide composite (MBC-MFC), was fabricated by chemical precipitation on carbonized mulberry stem according to response surface methodology (RSM) results. RSM was more convenient to figure out the optimized preparation condition of MBC-MFC theoretically for achieving a maximum removal efficiency of Cr(VI) and total chromium (TCr), compared to labor-intensive orthogonal experiments. The RSM results showed that Fe/Mn concentration (CFe; CMn), MBC activation temperature after soaking in KOH solution (T), and pH during precipitation of Fe-Mn oxide were three main factors to significantly affect the efficiency of MBC-MFC (p < 0.05) in Cr(VI) and TCr removal. With the selected condition (CFe = 0.28 mol/L; CMn = 0.14 mol/L; T = 790°C; pH = 9.0), MBC-MFC was synthesized with a large surface area (318.53 m2/g), and the point of zero charge values of MBC-MFC was 5.64. The fabricated MBC-MFC showed excellent adsorption performance of Cr(VI) and TCr in an aqueous solution. The maximum Cr(VI) and TCr removal capacity of MBC-MFC was 56.18 and 54.97 mg/g (T = 25°C, pH = 3.0, t = 48 h, and dosage = 0.10 g/50 ml), respectively, and the maximum Cr(VI) adsorption of MBC-MFC was 4.16 times that of bare MBC, suggesting the synergistic effects of Fe/Mn oxides and MB on the performance of MBC-MFC in Cr(VI) and TCr removal. The adsorption mechanism of MBC-MFC on chromium was mainly contributed by surface complexation and electrostatic attraction. Our study offers valuable outlooks to develop high-performance biochar-based sorbents for heavy metal removal and sustainable environmental remediation.

show abstract

Evolution of redox activity of biochar during interaction with soil minerals: Effect on the electron donating and mediating capacities for Cr(VI) reduction

Cited by 67 publications

References 81 publications

Biochar for the removal of contaminants from soil and water: a review

Biochar for the removal of contaminants from soil and water: a review

Redox-induced transformation of potentially toxic elements with organic carbon in soil

Synthesis, Optical Characterization, and Adsorption of Novel Hexavalent Chromium and Total Chromium Sorbent: A Fabrication of Mulberry Stem Biochar/Mn-Fe Binary Oxide Composite via Response Surface Methodology

Contact Info

Product

Resources

About