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Electron transfer pathways for efficient reduction of soil Cr(VI) by biochar-based microbial agents
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Fang ZHANG1, You-yuan CHEN1, 2, *, Li-qian DAI3, Xue-qin QIAO1, Yu-xin YAN1, Yang YANG1, Le-cheng LIU1, 2
China Environmental Science | 2025, 45(6) : 3180 - 3189
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China Environmental Science | 2025, 45(6): 3180-3189
• Soil Pollution Control •
Electron transfer pathways for efficient reduction of soil Cr(VI) by biochar-based microbial agents
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Fang ZHANG1, You-yuan CHEN1, 2, *, Li-qian DAI3, Xue-qin QIAO1, Yu-xin YAN1, Yang YANG1, Le-cheng LIU1, 2
Affiliations
  • 1.College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
  • 2.Key Laboratory of Marine Environment and Ecology, Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China
  • 3.Anji Branch of Huzhou Ecological Environment Bureau in Zhejiang Province, Huzhou 313300, China
Published: 2025-06-20
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This study systematically investigated the synergistic interactions between biochar and the model electroactive microorganism Shewanella oneidensis MR-1 in electron transfer processes through comprehensive electrochemical analyses, kinetic modeling, and electron pathway characterization using chromium(VI)-contaminated soil as the experimental matrix. The biochar-based microbial agents demonstrated effective Cr(VI) bioremediation, with biological reduction mediated by MR-1identified as the predominant mechanism following dual-process kinetics. Optimal remediation performance (96.30% Cr(VI) reduction efficiency) was achieved under conditions of 25mg/kg Cr(VI) contamination, 5% (w/w) biochar-based microbial agents dosage, and 30% soil moisture content. Comparative analysis revealed distinct temporal remediation patterns: adsorption-based biochar-microbial composites exhibited rapid initial Cr(VI) sequestration but limited long-term stability, whereas encapsulation-based formulations showed gradual but sustained reduction capacity. Mechanistic studies demonstrated that biochar functioned as an effective microbial carrier, simultaneously enhancing MR-1proliferation and facilitating extracellular electron transfer from microbial cells to Cr(VI) contaminants through its conductive carbon matrix. Notably, the immobilized system maintained 60.44% reduction efficiency after three operational cycles, highlighting its potential for sustainable in situ remediation of chromium-contaminated soils.

biochar-based microbial agents  /  reduction of Cr(VI)  /  soil remediation  /  MR-1  /  electron transport
Fang ZHANG, You-yuan CHEN, Li-qian DAI, Xue-qin QIAO, Yu-xin YAN, Yang YANG, Le-cheng LIU. Electron transfer pathways for efficient reduction of soil Cr(VI) by biochar-based microbial agents[J]. China Environmental Science, 2025 , 45 (6) : 3180 -3189 .
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Year 2025 volume 45 Issue 6
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  • Receive Date：2024-11-17
  • Online Date：2026-02-27
  • Published：2025-06-20
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  • Received：2024-11-17
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Affiliations
    1.College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
    2.Key Laboratory of Marine Environment and Ecology, Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China
    3.Anji Branch of Huzhou Ecological Environment Bureau in Zhejiang Province, Huzhou 313300, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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