The reduction of nitrobenzene by extracellular electron transfer facilitated by Fe-bearing biochar derived from sewage sludge
| Autor: | Changzheng Fan, Yue Lu, Jiangfang Yu, Jingjing Wang, Shoujuan Zhang, Qingqing Xie, Lin Tang, Zhaohui Yang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Health Toxicology and Mutagenesis 0211 other engineering and technologies Electrons 02 engineering and technology 010501 environmental sciences 01 natural sciences Nitrobenzene chemistry.chemical_compound Bioremediation Aniline Biochar Environmental Chemistry Waste Management and Disposal Geobacter sulfurreducens Nitrobenzenes 0105 earth and related environmental sciences 021110 strategic defence & security studies Sewage biology Chemistry biology.organism_classification Pollution Chemical engineering Charcoal Geobacter Pyrolysis Sludge |
| Zdroj: | Journal of Hazardous Materials. 403:123682 |
| ISSN: | 0304-3894 |
| Popis: | 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 ℃ 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. |
| Databáze: | OpenAIRE |
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