Response of organic acid-mobilized heavy metals in soils to biochar application

Achor, Samuel; Aravis, Charalambos; Heaney, Natalie; Odion, Ebhohon; Lin, Cheng‐Fang

doi:10.1016/j.geoderma.2020.114628

Cited by 33 publications

(11 citation statements)

References 39 publications

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“…and the discovery of reversible uptake of nitrate in biochar particles after aging in soil or compost, which results in the formation of an organic coating that enables biochar to more effectively retain anions (Hagemann, Joseph, et al, 2017; Hagemann, Kammann, et al, 2017; Haider et al, 2016; Joseph et al, 2017; Kammann et al, 2015). Also, low‐molecular‐weight organic acids in aqueous solution (Achor et al 2020) and the general presence of acidity, respective a lowered pH in solution (Fidel et al, 2018), have been shown to increase the ability of biochars to immobilize nitrate. In the above‐mentioned wetland restauration study of Rubin et al (2020), where up to 10% biochar addition decreased nitrate leaching up to 92%, the soil had a low pH of 4.6.…”

Section: Resultsmentioning

confidence: 99%

Biochar in agriculture – A systematic review of 26 global meta‐analyses

Schmidt¹,

et al. 2021

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Biochar is obtained by pyrolyzing biomass and is, by definition, applied in a way that avoids its rapid oxidation to CO2. Its use in agriculture includes animal feeding, manure treatment (e.g. as additive for bedding, composting, storage or anaerobic digestion), fertilizer component or direct soil application. Because the feedstock carbon is photosynthetically fixed CO2 from the atmosphere, producing and applying biochar is essentially a carbon dioxide removal (CDR) technology, which has a high‐technology readiness level. However, for swift implementation of pyrogenic carbon capture and storage (PyCCS), biochar use in agriculture needs to deliver co‐benefits, for example, by improving crop yields and ecosystem services and/or by improving climate change resilience by ameliorating key soil properties. Agronomic biochar research is a rapidly evolving field of research moving from less than 100 publications in 2010 to more than 15,000 by the end of 2020. Here, we summarize 26 rigorously selected meta‐analyses published since 2016 that investigated a multitude of soil properties and agronomic performance parameters impacted by biochar application, for example, effects on yield, root biomass, water use efficiency, microbial activity, soil organic carbon and greenhouse gas emissions. All 26 meta‐analyses show compelling evidence of the overall beneficial effect of biochar for all investigated agronomic parameters. One of the remaining challenges is the standardization of basic biochar analysis, still lacking in many studies. Incomplete biochar characterization increases uncertainty because adverse effects of individual studies included in the meta‐analyses might be related to low‐quality biochars, which would not qualify for certification and subsequent use (e.g. high content of contaminants, high salinity, incomplete pyrolysis, etc.). In summary, our systematic review suggests that biochar use in agriculture has the potential to combine CDR with significant agronomic and/or environmental co‐benefits.

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Section: Resultsmentioning

confidence: 99%

Biochar in agriculture – A systematic review of 26 global meta‐analyses

Schmidt¹,

et al. 2021

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“…Citric and malic acids have been reported to promote high leaching efficiencies, especially for the mobi lization of Cu, which can be attributed to the complex formation [38,88,97]. Additionally, positive results have been also obtained with Cd, Cu, and Pb using citric and malic acids [1], where Cu was the metal most highly recovered, being this recovery of around 36% with citric acid and 39% with malic acid; there was also achieved almost 65% of Cd recovery with oxalic acid.…”

Section: Interactions Between Organic Acids (Oa) and Metalsmentioning

confidence: 99%

“…Additionally, it is known that oxalic acid can help the formation of oxalates in most bio-leaching cases that involved a variety of metals in the matrix. In this regard, authors have reported the formation of oxalates with metals like Cd, Cu, and Pb from soil polluted with metals [1], Ni, and Cu from WPCB [28], and REE from calcination product of a coal coarse [51]. The study published by Ji et al 2020 also evaluated the potential of some OA to leach REE, where malonic and oxalic acids were evaluated as lixiviants, among other OA; it was found that both OA produced low metal recoveries.…”

Section: Interactions Between Organic Acids (Oa) and Metalsmentioning

confidence: 99%

Microbially-Produced Organic Acids as Leaching Agents for Metal Recovery Processes

Cruz-Rodríguez

Rojas-Avelizapa

Rivas-Castillo³

2022

Postępy Mikrobiologii - Advancements of Microbiology

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Minerals have been important throughout history, but nowadays, their use has increased, as well as their extraction needs. Therefore, due to the growing demand for metals, and both the depletion of high-grade ores and their related environmental concerns, the mining industry has been forced to leave behind the past traditional techniques of metal recovery (use of inorganic acids), and adopt eco-friendlier alternatives, such as the utilization of weaker leaching agents, such as organic acids. Thus, the present review is focused on the use of microbially-produced organic acids as a promising alternative to conventional techniques in the mining industry, with emphasis on the following topics: a) the advantages and disadvantages of the use of organic acids for leaching purposes, b) the main microorganisms studied for the production of these organic acids, c) a summary of the latest reports on bioleaching as well as a comparison of the existent techniques; d) the explanation of leaching mechanisms where organic acids may be involved, to fulfill metal recovery; and, e) interactions between metallic ions and organic acids. The review of the current knowledge regarding the use of organic acids for leaching purposes seeks the visualization of relevant strategies that may be improved for metal-recovery processes, intending to develop circular economy practices that may have the potential to be implemented at an industrial scale.

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“…Firstly, they can play important roles in controlling the transport of heavy metals in environmental media. [27][28][29][30] Additionally, it has been proposed that LMWOAs could enhance the transport of carbon-based nanoparticles (e.g., graphene oxide) in aquifers due to steric hindrance as well as deposition site competition between nanoparticles and LMWOA molecules. 23,31,32 In view of this, we have reason to believe that the presence of LMWOAs may influence the co-transport of heavy metal ions and carbonaceous nanoparticles in saturated porous media.…”

Section: Introductionmentioning

confidence: 99%

“…Firstly, they can play important roles in controlling the transport of heavy metals in environmental media. 27–30 Additionally, it has been proposed that LMWOAs could enhance the transport of carbon-based nanoparticles ( e.g. , graphene oxide) in aquifers due to steric hindrance as well as deposition site competition between nanoparticles and LMWOA molecules.…”

Section: Introductionmentioning

confidence: 99%

Insights into the effect of citric acid on the carbon dot-mediated transport of Cd²⁺ through saturated porous media

Zhang

Chen

et al. 2022

Environ. Sci.: Nano

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Response of organic acid-mobilized heavy metals in soils to biochar application

Cited by 33 publications

References 39 publications

Biochar in agriculture – A systematic review of 26 global meta‐analyses

Biochar in agriculture – A systematic review of 26 global meta‐analyses

Microbially-Produced Organic Acids as Leaching Agents for Metal Recovery Processes

Insights into the effect of citric acid on the carbon dot-mediated transport of Cd²⁺ through saturated porous media

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Response of organic acid-mobilized heavy metals in soils to biochar application

Cited by 33 publications

References 39 publications

Biochar in agriculture – A systematic review of 26 global meta‐analyses

Biochar in agriculture – A systematic review of 26 global meta‐analyses

Microbially-Produced Organic Acids as Leaching Agents for Metal Recovery Processes

Insights into the effect of citric acid on the carbon dot-mediated transport of Cd2+ through saturated porous media

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Insights into the effect of citric acid on the carbon dot-mediated transport of Cd²⁺ through saturated porous media