Effects and mechanisms of modified biochars on microbial iron reduction of Geobacter sulfurreducens

Lu, Yue; Hu, Yingju; Tang, Lin; Xie, Qingqing; Liu, Qian; Zhong, Linrui; Fu, Leiling; Fan, Changzheng

doi:10.1016/j.chemosphere.2021.130983

Cited by 27 publications

(5 citation statements)

References 51 publications

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“…Iron Mineralogy for Ferrihydrite Reduction by the Methanotrophic Consortia. Iron mineralogy and the effect of PC in this process have been widely reported for microbial ferrihydrite reduction by representative electroactive bacteria, including Shewanella and Geobacter, 24,26,29,57,58 but are not yet described for methane-fueled ferrihydrite reduction by ANME. 59 Here, we address these knowledge gaps with XRD analyses of the iron reduction products in microcosms in the presence and absence of PCs (Figure S11A and B).…”

Section: Environmental Science and Technologymentioning

confidence: 99%

Pyrogenic Carbon Promotes Anaerobic Oxidation of Methane Coupled with Iron Reduction via the Redox-Cycling Mechanism

Zhang,

Xie,

Cai

et al. 2023

Environ. Sci. Technol.

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Pyrogenic carbon (PC) can mediate electron transfer and thus catalyze biogeochemical processes to impact greenhouse gas (GHG) emissions. Here, we demonstrate that PC can contribute to mitigating GHG emissions by promoting the Fe(III)-dependent anaerobic oxidation of methane (AOM). It was found that the amendment PCs in microcosms dominated by Methanoperedenaceae performing Fe(III)-dependent AOM simultaneously promoted the rate of AOM and Fe(III) reduction with a consistent ratio close to the theoretical stoichiometry of 1:8. Further correlation analysis showed that the AOM rate was linearly correlated with the electron exchange capacity, but not the conductivity, of added PC materials, indicating the redox-cycling electron transfer mechanism to promote the Fe(III)-dependent AOM. The mass content of the C�O moiety from differentially treated PCs was well correlated with the AOM rate, suggesting that surface redox-active quinone groups on PCs contribute to facilitating Fe(III)dependent AOM. Further microbial analyses indicate that PC likely shuttles direct electron transfer from Methanoperedenaceae to Fe(III) reduction. This study provides new insight into the climate-cooling impact of PCs, and our evaluation indicates that the PC-facilitated Fe(III)-dependent AOM could have a significant contribution to suppressing methane emissions from the world's reservoirs.

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Section: Environmental Science and Technologymentioning

confidence: 99%

Pyrogenic Carbon Promotes Anaerobic Oxidation of Methane Coupled with Iron Reduction via the Redox-Cycling Mechanism

Zhang,

Xie,

Cai

et al. 2023

Environ. Sci. Technol.

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“…documented that Geobacter species have been implicated in the degradation of phenol [23]. Furthermore, the utilization of G. sulfurreducens PCA using acetate or phenol was studied in serum bial as shown in Figure 2B.…”

Section: The Electricity Generation Performance Of Rdcmentioning

confidence: 99%

The phenol efficient degradation using co‐culture coupled with enhanced electricity generation capability

et al. 2023

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The co‐culture of strain Citrobacter sp. RDC and Geobacter sulfurreducens PCA was used in this study and it was found that the co‐culture using 200 mg/L phenol as carbon source exhibited higher maximum current density than using the single strain RDC and G. sulfurreducens PCA, respectively. Meanwhile, the co‐culture was used to generate electricity by degrading phenol with the current density of 699.07 μA/cm2 by using 200 mg/L phenol as the sole carbon source, which was higher than that only using G. sulfurreducens PCA (236.20 μA/cm2). Especially, the degradation efficiency of 200 mg/L phenol by co‐culture can reach 55.16 % within 36 h being 4.16‐fold higher than the single strain G. sulfurreducens PCA. Furthermore, the component ratio of two strains was optimized for increasing electricity generation using 500 mg/L phenol as carbon source. The maximum current density was 501.54 μA/cm2 under the ratio of 3 : 1 for strain RDC to G. sulfurreducens PCA. These results highlight that phenol is good carbon source for co‐culture to produce electricity. The co‐culture system provides a promising application pathway for phenol degradation treatment coupled with electricity generation in the future.

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“…Moreover, electron donors are essential for the growth of bacteria (Lu et al, 2021). Owing to their large SSA and its aromaticity due to carbonization, chars are redox-active, serving both as an electron donor and acceptor for bacteria during the redox reaction process by directly mediating electron transfer processes that tie microbial cells (Lu et al, 2021). Thus, chars can significantly promote microbial electron transport activity and support bacterial growth (Kappler et al, 2014).…”

Section: Other Mechanismsmentioning

confidence: 99%

Pore characteristics of hydrochars and their role as a vector for soil bacteria: A critical review of engineering options

Thunshirn

Wenzel

Pfeifer

2021

Critical Reviews in Environmental Science and Technology

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Hydrothermal carbonization (HTC) is the method of choice to convert wet waste biomass to hydrochars. Their porous structure can serve as a microenvironment to plantgrowth-promoting rhizobacteria (PGPR), supporting their growth, survival, and activities. As published work lacks the systematic compilation of pore characteristics of hydrochars related to bacterial colonization, we collect available data and elaborate on their dependence on the carbonization process conditions, feedstocks, and methodology of pore system characterization. Our analysis indicates a high abundance of pores sized between 1 and 20 lm relevant for the protection of PGPR from predators, and of nutrients and labile C in hydrochars supporting bacterial growth. In addition to the selection of optimized process parameters and feedstocks (240-260 C, low feedstock pH, nonlignocellulosic biomass), adding mineral amendments prior to HTC offers opportunities for engineering hydrochars with an even larger share of pore space suited for bacterial colonization. Using the comprehensive literature on biochars, we demonstrate that the interior pore space in chars determines the potential to serve as an inoculum carrier to PGPR, thereby enhancing nutrient acquisition and protecting plants from diseases and abiotic stresses. The pore characteristics of hydrochars are comparable to biochars, and hydrochars are generally superior in providing a labile C reservoir that PGPR can readily access. We argue that HTC provides a cost-effective conversion route to produce PGPR vectors/carriers from wet (waste) biomass serving various environmental management objectives (waste recycling, soil fertility, soil remediation technologies) and circular bioeconomy (sustainable agriculture, substituting non-renewable carrier materials and fertilizers). HIGHLIGHTSWe review the role of pore characteristics of hydrochars for bacterial colonization We identify opportunities for engineering hydrochars to provide favorable habitat conditions to PGPR 240-260 C, low pH, non-lignocellulosic feedstocks, and adding mineral amendments increase the habitable pore space Hydrochars offer suitable pore characteristics and high labile C amounts and are promising PGPR carriers/vectors CONTACT Walter W. Wenzel

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Effects and mechanisms of modified biochars on microbial iron reduction of Geobacter sulfurreducens

Cited by 27 publications

References 51 publications

Pyrogenic Carbon Promotes Anaerobic Oxidation of Methane Coupled with Iron Reduction via the Redox-Cycling Mechanism

Pyrogenic Carbon Promotes Anaerobic Oxidation of Methane Coupled with Iron Reduction via the Redox-Cycling Mechanism

The phenol efficient degradation using co‐culture coupled with enhanced electricity generation capability

Pore characteristics of hydrochars and their role as a vector for soil bacteria: A critical review of engineering options

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