<br>热解碳通过氧化还原循环机制促进甲烷厌氧氧化并与铁还原相结合,Environmental Science & Technology

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热解碳通过氧化还原循环机制促进甲烷厌氧氧化并与铁还原相结合
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2023-11-10 , DOI: 10.1021/acs.est.3c05907
Xueqin Zhang ₁ , Mengying Xie ₁ , Chen Cai ₂ , Hesamoddin Rabiee _{1,

3,

4} , Zhiyao Wang ₁ , Bernardino Virdis ₁ , Gene W Tyson ₅ , Simon J McIlroy ₅ , Zhiguo Yuan ₆ , Shihu Hu ₁

Affiliation

热解碳（PC）可以介导电子转移，从而催化生物地球化学过程，从而影响温室气体（GHG）排放。在这里，我们证明 PC 可以通过促进 Fe(III) 依赖性甲烷厌氧氧化 (AOM) 来减少温室气体排放。结果发现，以Methanoperedenaceae为主的微观世界中执行Fe(III)依赖性AOM的修正PC同时促进了AOM和Fe(III)的还原率，其比率一致接近理论化学计量1:8。进一步的相关分析表明，AOM 速率与添加的 PC 材料的电子交换容量呈线性相关，但与电导率无关，表明氧化还原循环电子转移机制促进了 Fe(III) 依赖性 AOM。经过差别处理的 PC 中 C=O 部分的质量含量与 AOM 速率密切相关，表明 PC 上的表面氧化还原活性醌基团有助于促进 Fe(III) 依赖性 AOM。进一步的微生物分析表明，PC 可能将电子直接从Methanoperedenaceae转移到 Fe(III) 还原。这项研究提供了关于 PC 对气候降温影响的新见解，我们的评估表明 PC 促进的 Fe(III) 依赖性 AOM 可能对抑制世界水库的甲烷排放做出重大贡献。

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

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.

更新日期：2023-11-10

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