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Contribution of redox-active properties of compost-derived humic substances in hematite bioreduction

Chinese Chemical Letters 2022年第5期33卷 2731-2735页

作者： Chao Yang Lin-Xiao Hou Bei-Dou Xi Li-An Hou Xiao-Song He State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution Chinese Research Academy of Environmental SciencesBeijing 100012China School of Environmental Science and Engineering Tianjin UniversityTianjin 300350China College of Chemical and Biological Engineering Zhejiang UniversityHangzhou 310027China High-Tech Institute of Beijing Beijing 710025China

The compost-derived humic substances(HS)can function as electron mediators for promoting hematite bioreduction because of its redox *** process can affect redox capacities of compost-derived HS by changing its intrinsic ***,the redox properties of compost-derived HS link-ing with hematite bioreduction during composting still remain ***,we investigated the redox capacities of compost-derived HS,and assessed the responses of the redox capacities to the hematite *** result showed that compost-derived HS(i.e.,humic acids(HA)and fulvic acids(FA))were able to accept electrons from Shewanella oneidensis MR-1,and the electron accepting capacity was increased during ***,it could be functioned as electron mediators for promoting the hematite bioreduction,achieving 1.19-2.15 times compared with the control *** only the aromatic structures(quinone)but also the non-quinone structures such as nitrogen-and sulfur-containing functional moieties were served as the redox-active functional groups of compost-derived *** work proved that the aromatic functional groups and the heteroatom structures(especially N)were important to the hematite *** study highlights the redox-active properties of compost-derived HS and its impact on the microbial reduction of iron *** capacity of compost-derived HS might mitigate the environmental risk of contaminants when the composting production was added into the contaminated soils as low-cost repair materials.

关键词： Composting Humic substances reducing capacities Humic acids Hematite bioreduction

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