Redox-Active Oxygen-Containing Functional Groups in Activated Carbon Facilitate Microbial Reduction of Ferrihydrite

Wu, Song; Fang, Guodong; Wang, Yujun; Zheng, Yue; Wang, Chao; Zhao, Feng; Jaisi, Deb P.; Zhou, Dongmei

doi:10.1021/acs.est.7b01854

Cited by 120 publications

(111 citation statements)

References 65 publications

(133 reference statements)

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“…Figure S12a further showed the surface oxygen-containing functional groups were significantly positively correlated to methane production rates with a p value of 0.001. It is noteworthy that CV and quantification of the redox property have been employed to analyze the redox properties of biochar, hydrochar, and AC in previous studies, 18,19,39 while our results showed that they were not necessarily correlated to the promotion of biological process. The surface functional groups analysis based on FTIR and XPS provided valuable information to understand the role of hydrochar in AD.…”

Section: Effects Of Sh On the Key Microbial Populations Ascontrasting

confidence: 52%

See 1 more Smart Citation

Hydrochar-Facilitated Anaerobic Digestion: Evidence for Direct Interspecies Electron Transfer Mediated through Surface Oxygen-Containing Functional Groups

Ren

Usman

Tsang

et al. 2020

Environ. Sci. Technol.

237

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Acceleration of the anaerobic digestion (AD) process is crucial to achieving energy-efficient recycling of organic wastes. Hydrochar is produced by hydrothermal liquefaction of biomass, yet its application in the AD process is rarely reported. The present study showed that sewage sludge-derived hydrochar (SH) enhanced the methane production rate of glucose by 37%. SH increased the methane production rate from acetate but did not affect acidification and the methane production rate from H 2 /CO 2 . SH enhanced hydrogenotrophic methanogenesis, which could be due to direct interspecies electron transfer (DIET) by converting H + , e − , and CO 2 to methane. Trichococcus and Methanosaeta were dominant in the AD process with SH. Label-free proteomic analysis showed Methanosaeta was involved in DIET as reflected by the up-regulation of proteins involved in hydrogenotrophic methanogenesis. Hydrochars derived from corn straw (CH), Enteromorpha algae (EH), and poplar wood (PH), as well as activated carbon (AC), were also tested in the AD process. SH, CH, and EH obviously increased the methane production rates, which were 39%, 15%, and 20% higher than the control experiment, respectively. It was neither electrical conductivity nor the total redox property of hydrochars and AC but the abundances of surface oxygen-containing functional groups that correlated to the methane production rates.

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Section: Effects Of Sh On the Key Microbial Populations Ascontrasting

confidence: 52%

“…The methods (e.g., HNO 3 and H 2 O 2 pretreatment) to modify the hydrochar to increase surface oxygen-containing functional groups could be explored in future studies to further enhance AD efficiency. 18,20,54 ■ ASSOCIATED CONTENT * sı Supporting Information…”

Section: Effects Of Sh On the Key Microbial Populations Asmentioning

confidence: 99%

Hydrochar-Facilitated Anaerobic Digestion: Evidence for Direct Interspecies Electron Transfer Mediated through Surface Oxygen-Containing Functional Groups

Ren

Usman

Tsang

et al. 2020

Environ. Sci. Technol.

237

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“… 2017 ), a property that differentiate them from other redox-active carbon rich materials such as humic substances (Wu et al . 2017 ). Nevertheless, the role of BC redox reactions for influencing N 2 O emissions has not been experimentally verified with pure cultures of denitrifying bacteria or soil matrices yet (Yuan 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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“… 17 , 18 Through a powerful respiratory strategy, these endogenous electron mediators allow bacteria to use extracellular substrates that cannot be physically contacted (e.g., solid-phase electron acceptors with hydrophilic interfaces). 19 , 20 …”

Section: Introductionmentioning

confidence: 99%

Liposoluble quinone promotes the reduction of hydrophobic mineral and extracellular electron transfer of Shewanella oneidensis MR-1

et al. 2021

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Summary A large number of reaction systems are composed of hydrophobic interfaces and microorganisms in natural environment. However, it is not clear how microorganisms adjust their breathing patterns and respond to hydrophobic interfaces. Here, Shewanella oneidensis MR-1 was used to reduce ferrihydrite of a hydrophobic surface. Through Fe(II) kinetic analysis, it was found that the reduction rate of hydrophobic ferrihydrite was 1.8 times that of hydrophilic one. The hydrophobic surface of the mineral hinders the way the electroactive microorganism uses the water-soluble electron mediator riboflavin for indirect electron transfer and promotes MR-1 to produce more liposoluble quinones. Ubiquinone can mediate electron transfer at the hydrophobic interface. Ubiquinone-30 (UQ-6) increases the reduction rate of hydrophobic ferrihydrite from 38.5 ± 4.4 to 52.2 ± 0.8 μM·h −1 . Based on the above experimental results, we propose that liposoluble electron mediator ubiquinone can act on the extracellular hydrophobic surface, proving that the metabolism of hydrophobic minerals is related to endogenous liposoluble quinones. Hydrophobic modification of minerals encourages electroactive microorganisms to adopt differentiated respiratory pathways. This finding helps in understanding the electron transfer behavior of the microbes at the hydrophobic interface and provides new ideas for the study of hydrophobic reactions that may occur in systems, such as soil and sediment.

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Redox-Active Oxygen-Containing Functional Groups in Activated Carbon Facilitate Microbial Reduction of Ferrihydrite

Cited by 120 publications

References 65 publications

Hydrochar-Facilitated Anaerobic Digestion: Evidence for Direct Interspecies Electron Transfer Mediated through Surface Oxygen-Containing Functional Groups

Hydrochar-Facilitated Anaerobic Digestion: Evidence for Direct Interspecies Electron Transfer Mediated through Surface Oxygen-Containing Functional Groups

Biochar as electron donor for reduction of N2O by Paracoccus denitrificans

Liposoluble quinone promotes the reduction of hydrophobic mineral and extracellular electron transfer of Shewanella oneidensis MR-1

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