School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, PR China; Hubei Provincial Engineering Laboratory for Solid Waste Treatment Disposal and Recycling, Wuhan, Hubei 430074, PR China.
School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, PR China; Hubei Provincial Engineering Laboratory for Solid Waste Treatment Disposal and Recycling, Wuhan, Hubei 430074, PR China; State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan, Hubei 430074, PR China.
Bioresour Technol. 2021 Nov;340:125717. doi: 10.1016/j.biortech.2021.125717. Epub 2021 Aug 4.
A microbial fuel cell-photocatalysis system with a novel photocatalytic air-cathode (MFC-PhotoCat) was proposed for synergistic degradation of 2,4,6-trichlorophenol (TCP) with simultaneous electricity generation. Stable electricity generation of 350 mV was achieved during 130 days of operation. Besides, 50 mg L TCP was completely degraded within 72 h, and the rate constant of 0.050 h was 1.8-fold higher than MFC with air-cathode without N-TiO photocatalyst. Degradation pathway was proposed based on the intermediates detected and density functional theory (DFT) calculation, with two open-chain intermediates (2-chloro-4-keto-2-hexenedioic acid and hexanoic acid) detected. Furthermore, hierarchical cluster and PCoA revealed significant shifts of microbial community structures, with enriched exoelectrogen (55.2% of Geobacter) and TCP-degrading microbe (7.1% of Thauera) on the cathode biofilm as well as 61.8% of Pseudomonas in the culture solution. This study provides a promising strategy for synergic degradation of recalcitrant contaminants by intimate-coupling of MFC and photocatalysis.
提出了一种具有新型光催化空气阴极的微生物燃料电池-光催化系统（MFC-PhotoCat），用于协同降解 2,4,6-三氯苯酚（TCP）并同时发电。在 130 天的运行过程中，实现了 350 mV 的稳定发电。此外，50 mg/L 的 TCP 在 72 h 内完全降解，其速率常数为 0.050 h，比没有 N-TiO 光催化剂的空气阴极微生物燃料电池高 1.8 倍。根据检测到的中间产物和密度泛函理论（DFT）计算，提出了降解途径，检测到了两种开链中间产物（2-氯-4-酮-2-己烯二酸和己酸）。此外，层次聚类和 PCoA 显示微生物群落结构发生了显著变化，阴极生物膜上富集了好氧菌（55.2%的 Geobacter）和 TCP 降解菌（7.1%的 Thauera），培养液中有 61.8%的假单胞菌。本研究为微生物燃料电池和光催化的紧密耦合协同降解难降解污染物提供了一种有前景的策略。
