In this study, the attempt was made to enhance the degradation of the typical antibiotics, metronidazole (MNZ) by coupling three-electrode photocatalytic and microbial fuel cell systems (PMFC). The PMFC reactor was constructed, and the photocatalytic bioanode, attached with TiO2, was synthesized and characterized using SEM, EDS, XPS methods. The stability of microbial on bioanode was tested during acclimatization process. Electrochemical characteristics, including power density, CV and EIS curve, were analyzed to explore the advantage of power generation and higher electron transfer interaction in the PMFC. Compared with the traditional MFC system, the improved degradation and enhanced mineralization of MNZ were achieved, and the 1.30 and 1.24-fold increase in MNZ and TOC removal were realized, respectively. The three degradation pathways of MNZ were identified by LC-MS in the coupling PMFC, and the intermediates were more easily to further degrade and mineralize. The structure of the microbial community was demonstrated, and the functional species consisted of MNZ degradation bacteria, exoelectrogens, hydrocarbon removal bacterial, and nitrogen removal bacterial, were largely enriched in the PMFC, contributing to the improved electricity production, MNZ degradation and photoelectric effect. Moreover, the photoelectric played the selective role in the enrichment of functional microbial. The study provides a promising and environmentally approach for the treatment of containing antibiotics wastewater in the practical application.

中文翻译：

---

光催化与微生物燃料电池耦合增强甲硝唑降解的机理和电化学特性


在这项研究中，试图通过耦合三电极光催化和微生物燃料电池系统 （PMFC） 来增强典型抗生素甲硝唑 （MNZ） 的降解。构建了 PMFC 反应器，合成了附着 TiO2 的光催化生物阳极，并采用 SEM、EDS、XPS 方法进行了表征。在驯化过程中测试微生物在生物阳极上的稳定性。分析了电化学特性，包括功率密度、CV 和 EIS 曲线，以探索 PMFC 中发电和更高电子转移相互作用的优势。与传统的 MFC 系统相比，MNZ 的降解得到改善，矿化程度增强，MNZ 和 TOC 去除分别提高了 1.30 倍和 1.24 倍。通过 LC-MS 在偶联 PMFC 中鉴定出 MNZ 的 3 种降解途径，中间体更容易进一步降解和矿化。证明了微生物群落的结构，由 MNZ 降解细菌、外电原、碳氢化合物去除细菌和脱氮细菌组成的功能物种在 PMFC 中大量富集，有助于改善发电、MNZ 降解和光电效应。此外，光电在功能微生物的富集中起着选择性作用。该研究为实际应用中含有抗生素的废水的处理提供了一种有前途的环保方法。