The conductivity and redox properties of pyrolyzed carbon mediate methanogenesis in paddy soils with ethanol as substrate
The conductivity and redox properties of pyrolyzed carbon mediate methanogenesis in paddy soils with ethanol as substrate
复制标题
以乙醇为底物的稻土中热解碳介导产甲烷的电导率和氧化还原特性
DOI：
10.1016/j.scitotenv.2021.148906
复制
发表时间：
2021
影响因子：
9.8
通讯作者：
Xing Baoshan
中科院分区：
文献类型：
--
作者：
Zhang Peng;Zhang Jinshuo;Sun Zhengyi;He Chao;Pan Bo;Xing Baoshan
生物炭和活性炭等热解碳可以影响水稻土的甲烷生成，这是控制甲烷排放的重要过程。热解碳的电导率和氧化还原活性等不同的电化学性质可能与甲烷生成有关。然而，它们的不同作用在以前并没有得到充分的说明。在本研究中，我们通过比较以乙醇为底物的热解碳样品的电化学性质的顺序变化，确定了热解碳的氧化还原性质和电子电导率在乙醇为底物的甲烷生成中的作用。添加后，给电子容量最高的热解碳（0.85 mmol/g）使甲烷生成率提高了33.3%；而其他接受电子容量比B4高、给电子容量比B4低的热解碳则抑制了甲烷的生成。电活性菌和某些产甲烷菌的相对丰度随热解温度的升高而升高。电活性菌/某些产甲烷菌与水稻土循环伏安峰电流呈严格的线性关系，说明热解碳的电子穿梭能力改善了电子传递情况，从而改变了微生物结构。本研究可以加深我们对热解碳在产甲烷过程中的作用的认识。
Pyrolyzed carbon such as biochar and activated carbon could influence the methanogenesis in paddy soil, which is an important process controlling methane emission. Different electrochemical properties of pyrolyzed carbon may be involved in methanogenesis, such as conductivity and redox activity. However, their different roles have not been thoroughly illustrated before. In this study, we identified the roles of pyrolyzed carbon redox property and electron conductivity in methanogenesis with ethanol as a substrate, by comparing pyrolyzed carbon samples with sequential change of electrochemical properties. Right after the addition, pyrolyzed carbon with highest electron donating capacity (0.85 mmol/g) promoted the methane generation by 33.3%; while, other pyrolyzed carbon with higher electron accepting capacity and lower electron donating capacity than B4 inhibited the methane generation. The relative abundance of electroactive bacteria and certain methanogens increased with the pyrolysis temperature. The strict linear relationship between electroactive bacteria/certain methanogens and cyclic voltammetry peak currents of paddy soil implied that microbial structure was altered due to the improved the electron transfer situation by the electron shuttle ability of pyrolyzed carbon. This study could deepen our understanding about the effect of pyrolyzed carbon on methanogenesis process.