Biochar as Electron Acceptor for Microbial Extracellular Respiration

Li, Yu; Wang, Yueqiang; Yuan, Yong; Tang, Jia; Zhou, Shungui

doi:10.1080/01490451.2015.1062060

Cited by 64 publications

(15 citation statements)

References 40 publications

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“…Usually, biochar is considered as a soil conditioner in many studies to improve soil fertility by increasing the pH and nutrient retention and shift soil biological community composition and abundance in soil and sediments ( Tong et al, 2014 ; Yu et al, 2015 , 2016 ). Biochar did not have a significant effect on the soil pH as the initial pH of the experimental soil is alkaline (Supplementary Figure S3A ).…”

Section: Discussionmentioning

confidence: 99%

Typical Soil Redox Processes in Pentachlorophenol Polluted Soil Following Biochar Addition

et al. 2018

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Reductive dechlorination is the primary pathway for environmental removal of pentachlorophenol (PCP) in soil under anaerobic condition. This process has been verified to be coupled with other soil redox processes of typical biogenic elements such as carbon, iron and sulfur. Meanwhile, biochar has received increasing interest in its potential for remediation of contaminated soil, with the effect seldom investigated under anaerobic environment. In this study, a 120-day anaerobic incubation experiment was conducted to investigate the effects of biochar on soil redox processes and thereby the reductive dechlorination of PCP under anaerobic condition. Biochar addition (1%, w/w) enhanced the dissimilatory iron reduction and sulfate reduction while simultaneously decreased the PCP reduction significantly. Instead, the production of methane was not affected by biochar. Interestingly, however, PCP reduction was promoted by biochar when microbial sulfate reduction was suppressed by addition of typical inhibitor molybdate. Together with Illumina sequencing data regarding analysis of soil bacteria and archaea responses, our results suggest that under anaerobic condition, the main competition mechanisms of these typical soil redox processes on the reductive dechlorination of PCP may be different in the presence of biochar. In particularly, the effect of biochar on sulfate reduction process is mainly through promoting the growth of sulfate reducer (Desulfobulbaceae and Desulfobacteraceae) but not as an electron shuttle. With the supplementary addition of molybdate, biochar application is suggested as an improved strategy for a better remediation results by coordinating the interaction between dechlorination and its coupled soil redox processes, with minimum production of toxic sulfur reducing substances and relatively small emission of greenhouse gas (CH4) while maximum removal of PCP.

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Section: Discussionmentioning

confidence: 99%

Typical Soil Redox Processes in Pentachlorophenol Polluted Soil Following Biochar Addition

et al. 2018

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“… 2016 ; Yu et al . 2016 ). Both electron donor or electron shuttle functions are based on the presence of redox-active functional groups (quinones/hydroquinones) and redox-active aromatic structures that allow the presence of delocalized π-electrons in BC (Chen et al .…”

Section: Introductionmentioning

confidence: 99%

Biochar as electron donor for reduction of N2O by Paracoccus denitrificans

Pascual

Sánchez-Monedero

Cayuela

et al. 2020

FEMS Microbiology Ecology

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Biochar (BC) has been shown to influence microbial denitrification and mitigate soil N2O emissions. However, it is unclear if BC is able to directly stimulate the microbial reduction of N2O to N2. We hypothesized that the ability of BC to lower N2O emissions could be related not only to its ability to store electrons, but to donate them to bacteria that enzymatically reduce N2O. Therefore, we carried out anoxic incubations with Paracoccus denitrificans, known amounts of N2O, and nine contrasting BCs, in the absence of any other electron donor or acceptor. We found a strong and direct correlation between the extent and rates of N2O reduction with BC's EDC/EEC (electron donating capacity/electron exchange capacity). Apart from the redox capacity, other BC properties were found to regulate the BC's ability to increase N2O reduction by P. denitrificans. For this specific BC series, we found that a high H/C and ash content, low surface area and poor lignin feedstocks favored N2O reduction. This provides valuable information for producing tailored BCs with the potential to assist and promote the reduction of N2O in the pursuit of reducing this greenhouse gas emissions.

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“…The main assumption for the beneficial properties of biochars has been their large specific surface area and corresponding surface chemistry leading to extensive sorption capacity for crop nutrients, pollutants or gases 2 8 11 12 13 14 15 16 17 18 . The redox properties of chars has only been very recently studied and proposed as a possible cause for numerous (bio/geo)chemical processes 1 19 20 21 22 23 24 25 26 27 28 . These studies proved that biochars from various feedstock sources can either accept, donate or mediate substantial amounts of electrons in their environment, either abiotically or in relation with microorganisms.…”

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confidence: 99%

The electron donating capacity of biochar is dramatically underestimated

Prévoteau

Ronsse

Cid

et al. 2016

Sci Rep

124

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Biochars have gathered considerable interest for agronomic and engineering applications. In addition to their high sorption ability, biochars have been shown to accept or donate considerable amounts of electrons to/from their environment via abiotic or microbial processes. Here, we measured the electron accepting (EAC) and electron donating (EDC) capacities of wood-based biochars pyrolyzed at three different highest treatment temperatures (HTTs: 400, 500, 600 °C) via hydrodynamic electrochemical techniques using a rotating disc electrode. EACs and EDCs varied with HTT in accordance with a previous report with a maximal EAC at 500 °C (0.4 mmol(e−).gchar−1) and a large decrease of EDC with HTT. However, while we monitored similar EAC values than in the preceding study, we show that the EDCs have been underestimated by at least 1 order of magnitude, up to 7 mmol(e−).gchar−1 for a HTT of 400 °C. We attribute this existing underestimation to unnoticed slow kinetics of electron transfer from biochars to the dissolved redox mediators used in the monitoring. The EDC of other soil organic constituents such as humic substances may also have been underestimated. These results imply that the redox properties of biochars may have a much bigger impact on soil biogeochemical processes than previously conjectured.

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Biochar as Electron Acceptor for Microbial Extracellular Respiration

Cited by 64 publications

References 40 publications

Typical Soil Redox Processes in Pentachlorophenol Polluted Soil Following Biochar Addition

Typical Soil Redox Processes in Pentachlorophenol Polluted Soil Following Biochar Addition

Biochar as electron donor for reduction of N2O by Paracoccus denitrificans

The electron donating capacity of biochar is dramatically underestimated

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