The reduction of nitrobenzene by extracellular electron transfer facilitated by Fe-bearing biochar derived from sewage sludge
The reduction of nitrobenzene by extracellular electron transfer facilitated by Fe-bearing biochar derived from sewage sludge
复制标题
污水污泥中含铁生物炭促进细胞外电子转移还原硝基苯
DOI：
10.1016/j.jhazmat.2020.123682
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发表时间：
2021-02-05
影响因子：
13.6
通讯作者：
Zhang, Shoujuan
中科院分区：
文献类型：
--
作者：
Lu, Yue;Xie, Qingqing;Zhang, Shoujuan
在本工作中，含铁污泥生物炭的加入大大促进了硝基苯(NB)的生物还原和非生物还原为苯胺，这归因于伴随着微生物异化铁的还原。硫还原地杆菌产生的生物源Fe(II)在Nb的厌氧还原过程中占主导地位，遵循准一级动力学规律。此外，随着热解温度从600℃提高到900℃，生物炭的生成速度加快，Nb的去除速率也随之提高。硫还原菌生物炭的形态和结构表征证实了导电细菌-生物炭聚集体的形成。电化学测试表明，生物炭中存在石墨化结构域和类苯二酮基作为氧化还原活性中心，这可能在促进微生物异化铁还原和Nb降解的电子转移中发挥重要作用。本研究为利用含铁污泥生产生物炭提供了一条可行的途径，并将其应用于电化学活性细菌对硝基芳香族化合物污染废水的生物修复。
In this work, the incorporation of Fe-bearing sludge-derived biochar greatly enhanced both biotic and abiotic reduction of nitrobenzene (NB) to aniline, which was attributed to the concomitant microbial dissimilatory iron reduction. Biogenic Fe(II) produced by Geobacter sulfurreducens dominated the anaerobic reduction of NB following the pseudo-first-order kinetic. Besides, the increase of pyrolysis temperature from 600 to 900 degrees C to generate biochar resulted in an accelerated removal rate of NB in Geobacter-biochar combined system. The morphology and structural characterization of biochar with G. sulfurreducens confirmed the formation of conductive bacteria-biochar aggregates. Electrochemical measurements suggested the presence of graphitized domains and quinone-like moieties in biochar as redox-active centers, which might play an important role in accelerating electron transfer for microbial dissimilatory iron reduction and NB degradation. This study provides a feasible way of using Fe-bearing sludge as a valuable feedstock for biochar generation and its application with electrochemically active bacteria for the bioremediation of nitroaromatic compounds-polluted wastewater.