数字农科院2.0

S–Mo conversion stimulates soil electron transfer and hydrocarbon removal for nearly one year

文献类型： 外文期刊

作者： Jialu Sun;Xiaojuan Yi;Yuewei Yang;Yun Zhang;Xin Yu;Side Yang;Xiaolin Zhang;Ting Han;Xinhong Peng;Xiaojing Li

作者机构：

关键词： Electron transfer;Hydrocarbon degradation;Molybdenum electron shuttle;Soil;Thiosulfate

期刊名称： Chemical Engineering Journal

ISSN： 1385-8947

年卷期： 2025 年 508 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Microbial extracellular electron transfer provides a basic force for the biodegradation of organic pollutants. However, the contribution of sulfocompound transformation as an electron acceptor or donor to soil electron transport remains ambiguous. In a soil microbial electrochemical system (MES), we found that soil electron transfer improved by 12–93 % in terms of thiosulfate conversion in the long term (320 days) but not in the short term (32 days). Since the protein content of the extracellular polymeric substances in the soil increased by 54–67 %, especially cytochrome c, which increased by 35–56 %, the electron transport capacity improved. Consequently, exogenous thiosulfate promoted the degradation of petroleum hydrocarbons, including PAHs, because the metabolic potential for thiosulfate–sulfur oxidation was much greater. According to the material mass balance, thiosulfate is directly oxidized (49 %) or indirectly (25 %) oxidized to sulfate, which plays a leading role in transforming different valences of inorganic sulfur. Unexpectedly, when the molybdate content was insufficient for inhibiting sulfate reduction, molybdate was reduced to Mo(V) and Mo(IV)-S complexes, which increased electron transfer by 93 %. This study reveals the relationship between S–Mo conversion and electron transfer and provides a new strategy for improving the performance of soil bioelectricity.

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