Bioprocess and Biosystems Engineering ( IF 3.5 ) Pub Date : 2021-01-09 , DOI: 10.1007/s00449-020-02485-4 Rehab H Mahmoud 1 , Farag A Samhan 1 , Mohamed K Ibrahim 2 , Gamila H Ali 1 , Rabeay Y A Hassan 3, 4
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Abstract
Microbial fuel cells (MFCs) have significant interest in the research community due to their ability to generate electricity from biodegradable organic matters. Anode materials and their morphological structures play a crucial role in the formation of electroactive biofilms that enable the direct electron transfer. In this work, modified electrodes with nanomaterials, such as multiwalled carbon nanotubes (MWCNTs), reduced graphene oxide (rGO), Al2O3/rGO or MnO2/MWCNTs nanocomposites were synthesized, characterized and utilized to support the growth of electrochemically active biofilms. The MFC's performance is optimized using anode-respiring strains isolated from biofilm-anode surface, while the adjusted operation is conducted with the consortium of (Enterobacter sp.). Besides the formation of matured biofilm on its surface, MnO2/MWCNTs nanocomposite produced the highest electrical potential outputs (710 mV) combined with the highest power density (372 mW/m2). Thus, a correlation between the anode nanostructured materials and the progression of the electrochemically active biofilms formation is presented, allowing new thoughts for enhancing the MFC's performance for potential applications ranging from wastewater treatment to power sources.
Graphical abstract
中文翻译：
由纳米结构阳极表面衍生的电活性生物膜的形成
摘要
微生物燃料电池 (MFC) 因其能够从可生物降解的有机物质中发电而受到研究界的极大兴趣。阳极材料及其形态结构在形成能够实现直接电子转移的电活性生物膜中起着至关重要的作用。在这项工作中，使用纳米材料修饰电极，如多壁碳纳米管 (MWCNTs)、还原氧化石墨烯 (rGO)、Al 2 O 3 /rGO 或 MnO 2 /MWCNTs 纳米复合材料被合成、表征并用于支持电化学活性的生长。生物膜。MFC 的性能使用从生物膜 - 阳极表面分离的阳极呼吸菌株进行了优化，而调整后的操作是与（肠杆菌属。）。除了在其表面形成成熟的生物膜外，MnO 2 /MWCNTs 纳米复合材料产生最高的电势输出（710 mV）和最高的功率密度（372 mW/m 2）。因此，提出了阳极纳米结构材料与电化学活性生物膜形成进程之间的相关性，为提高 MFC 在从废水处理到电源等潜在应用中的性能提供了新的思路。
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