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

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Xueqin Zhang
  • Mengying Xie
  • Chen Cai
  • Hesamoddin Rabiee
  • Zhiyao Wang
  • Bernardino Virdis
  • Gene W. Tyson
  • Simon J. McIlroy
  • Shihu Hu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)19793–19804
Journal / PublicationEnvironmental Science and Technology
Volume57
Issue number48
Online published10 Nov 2023
Publication statusPublished - 5 Dec 2023

Abstract

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. © 2023 American Chemical Society.

Research Area(s)

  • anaerobic methanotrophic archaea, anaerobic oxidation of methane, extracellular electron transfer, methane mitigation, Methanoperedenaceae

Citation Format(s)

Pyrogenic Carbon Promotes Anaerobic Oxidation of Methane Coupled with Iron Reduction via the Redox-Cycling Mechanism. / Zhang, Xueqin; Xie, Mengying; Cai, Chen et al.
In: Environmental Science and Technology, Vol. 57, No. 48, 05.12.2023, p. 19793–19804.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review