Tetracycline (TC) as a common broad-spectrum antibiotic, has been frequently detected in soil and surface water. It becomes a great threat to the ecological environment. Here, a device of photocatalysis assisted microbial fuel cell (photo-MFC) was constructed for TC degradation and energy recovery. In this photo-MFC, cadmium sulfide(CdS) cage photocatalysis can degrade most of TC in a short time. While the Co₃O₄@C–CC (carbonization and calcination of the ZIF-67 precursor in-situ grown on the carbon cloth (CC)) bioanode degrades the rest of TC as well as the photocatalytic products, thus improving the mineralization. The co-existence of photocatalysis with bioanode changes the microbial community structure of the biofilms. The dominant phylum is Geobacter (60.2%) in normal MFC while that in photo-MFC are Proteobacteria (43.5%) and Geobacter (33.2%). Therefore, the synergistic effect of photocatalytic degradation and biodegradation achieves a chemical oxygen demand (COD) removal of 98.6%, which is higher than that of normal MFC (77.6%) or single CdS cage photocatalysis (23.8%). In addition, the photogenerated electrons can be transferred to the cathode, which reduces their combination with holes and increases the electricity generation of MFC, achieving a maximum power density of 3.37 W/m². After degradation, the effluent with 200 mg L⁻¹ TC exhibits no visible biotoxity. Furthermore, electrochemical test, finite-difference time-domain (FDTD), density functional theory (DFT) calculation and the free radical trapping experiments verify the possible mechanisms of photocatalytic degradation in this photo-MFC. This strategy paves a new way for low energy consumption removal and energy recovery of organic pollutants.

四环素（TC）作为一种常见的广谱抗生素，在土壤和地表水中经常被检测到。它对生态环境造成巨大威胁。这里，构建了光催化辅助微生物燃料电池（photo-MFC）装置，用于TC降解和能量回收。在这种光MFC中，硫化镉(CdS)笼光催化作用可以在短时间内降解大部分TC。而Co ₃ O ₄ @C–CC（在碳布（CC）上原位生长的ZIF-67前体的碳化和煅烧）生物阳极会降解其余的TC以及光催化产物，从而改善矿化。光催化与生物阳极的共存改变了生物膜的微生物群落结构。优势门是地杆菌门正常MFC中的细菌（60.2％），而光MFC中的细菌是变形菌（43.5％）和地杆菌（33.2％）。因此，光催化降解和生物降解的协同效应实现了化学需氧量（COD）去除率98.6%，高于普通MFC（77.6%）或单一CdS笼光催化（23.8%）。此外，光生电子可以转移到阴极，减少了它们与空穴的结合，增加了MFC的发电量，实现了3.37 W/m 2 的最大功率^密度。降解后，出水含200mg·L ⁻¹TC 没有表现出明显的生物毒性。此外，电化学测试、时域有限差分（FDTD）、密度泛函理论（DFT）计算和自由基捕获实验验证了该光MFC光催化降解的可能机制。该策略为有机污染物的低能耗去除和能量回收开辟了新途径。