Efficient nitrate removal via microorganism-iron oxide co-evolution on biocathode surface

IF 4.8 2区化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY

Bioelectrochemistry Pub Date : 2024-12-25 DOI:10.1016/j.bioelechem.2024.108889

Xiaojun Liu , Huihui Dong , Qinyu Wang , Jing Yang , Xinru Zhai , Mingzhen Lin , Kaixin Liu , Qinzheng Yang

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引用次数: 0

Abstract

Sediment microbial fuel cell (SMFC) is a device for biological denitrification, in which electrons produced by sediment microorganisms can be transferred to the upper layer of the water column lacking electron donors. However, the low efficiency of denitrifying bacteria in acquiring electrons and enriching at the cathode greatly hinders the application of SMFC for nitrogen removal. In this study, we report a novel method of constructing a high-performance biocathode by modifying electrodes with zero-valent iron to enhance the enrichment and electron transfer of electroactive bacteria. The surface chemical and biological analysis of the biocathode revealed that the ZVI gradually oxidized to form magnetite and goethite, and finally stabilized into better crystallized lepidocrocite. On the other hand, the microbial community of the biocathode gradually evolved into a community dominated by denitrifying bacteria, specifically Clostridium. The co-evolved “Clostridium-lepidocrocite” composite endows the sediment microbial fuel cell with a 99% nitrate removal capacity. These results indicate that the cathode constructed by using ZVI modified electrode achieves efficient nitrate reduction by denitrifying bacteria. Furthermore, the construction method of biocathode may also have the potential application in water remediation and the geochemical cycling of elements.

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生物阴极表面微生物-氧化铁协同进化高效去除硝酸盐。

沉积物微生物燃料电池（SMFC）是一种生物反硝化装置，其中沉积物微生物产生的电子可以转移到没有电子供体的水柱上层。然而，反硝化细菌在阴极获取电子和富集的效率较低，极大地阻碍了SMFC在脱氮中的应用。在这项研究中，我们报告了一种通过用零价铁修饰电极来构建高性能生物阴极的新方法，以增强电活性细菌的富集和电子转移。生物阴极的表面化学和生物学分析表明，ZVI逐渐氧化形成磁铁矿和针铁矿，最终稳定为结晶较好的鳞状云母。另一方面，生物阴极的微生物群落逐渐演变为以反硝化细菌为主的群落，特别是梭状芽胞杆菌。共同进化的“梭状芽孢杆菌”复合材料赋予沉积物微生物燃料电池99%的硝酸盐去除能力。这些结果表明，用ZVI修饰电极构建的阴极可以实现反硝化细菌对硝酸盐的高效还原。此外，生物阴极的构建方法在水体修复和元素的地球化学循环中也有潜在的应用前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Bioelectrochemistry 生物-电化学

CiteScore

9.10

自引率

6.00%

发文量

238

审稿时长

38 days

期刊介绍： An International Journal Devoted to Electrochemical Aspects of Biology and Biological Aspects of Electrochemistry Bioelectrochemistry is an international journal devoted to electrochemical principles in biology and biological aspects of electrochemistry. It publishes experimental and theoretical papers dealing with the electrochemical aspects of: • Electrified interfaces (electric double layers, adsorption, electron transfer, protein electrochemistry, basic principles of biosensors, biosensor interfaces and bio-nanosensor design and construction. • Electric and magnetic field effects (field-dependent processes, field interactions with molecules, intramolecular field effects, sensory systems for electric and magnetic fields, molecular and cellular mechanisms) • Bioenergetics and signal transduction (energy conversion, photosynthetic and visual membranes) • Biomembranes and model membranes (thermodynamics and mechanics, membrane transport, electroporation, fusion and insertion) • Electrochemical applications in medicine and biotechnology (drug delivery and gene transfer to cells and tissues, iontophoresis, skin electroporation, injury and repair). • Organization and use of arrays in-vitro and in-vivo, including as part of feedback control. • Electrochemical interrogation of biofilms as generated by microorganisms and tissue reaction associated with medical implants.