Microbial electrochemical systems (MESs) can enhance methane production in anaerobic digestion, but their performance is hindered by inadequate electron transfer between the cathode and microbes. Magnetite–zeolite (MZ)‐based catalysts accelerate electron exchange; however, the optimal loading of MZ is crucial for maximizing MES performance. In this study, different loadings of the MZ catalyst ranging from 0 to 2 mg cm−2 on the cathode were evaluated to obtain an optimum loading for maximizing methane recovery from MES. Electrochemical analyses demonstrated enhanced electrochemical reduction kinetics of the cathode with increased MZ loading from 0 to 2 mg cm−2. Among the tested loadings, the MES with 1 mg cm−2 MZ on the cathode exhibited the highest methane production rate at 548 mL L−1 d−1, surpassing other MES operations with 2 and 0.5 mg cm−2 (499 and 434 mL L−1 d−1, respectively). Additionally, the MES with 1 mg cm−2 MZ demonstrated the highest soluble chemical oxygen demand removal efficiency of 87% and total coulomb recovery of 1444.06C ± 42.60C, with the lowest amount of volatile fatty acids accumulation. Consequently, MZ is recommended as a superior catalyst for enhancing MES performance and suggested to utilize 1 mg cm−2 MZ loading on the cathode to maximize methane production.

中文翻译：

---

微生物电化学-厌氧消化系统阴极上最佳负载磁铁矿-沸石纳米颗粒以增强甲烷生成

微生物电化学系统（MES）可以提高厌氧消化中的甲烷产量，但其性能因阴极和微生物之间的电子传递不足而受到阻碍。磁铁矿-沸石（MZ）基催化剂加速电子交换；然而，MZ 的最佳负载对于最大化 MES 性能至关重要。在本研究中，MZ 催化剂的不同负载量范围为 0 至 2 mg cm−2对阴极上的负载进行了评估，以获得最大化 MES 中甲烷回收的最佳负载。电化学分析表明，随着 MZ 负载量从 0 mg cm 增加到 2 mg cm，阴极电化学还原动力学增强−2。测试负载中，MES 为 1 mg cm−2阴极上的 MZ 表现出最高的甲烷产率，为 548 mL·L−1d−1，以 2 和 0.5 mg cm 超越其他 MES 操作−2（499 和 434 毫升/升−1d−1， 分别）。此外，MES 具有 1 mg cm−2MZ表现出最高的可溶性化学需氧量去除效率（87%）和总库仑回收率（1444.06C±42.60C），挥发性脂肪酸积累量最低。因此，MZ 被推荐作为增强 MES 性能的优质催化剂，并建议使用 1 mg cm−2MZ 负载在阴极上以最大限度地提高甲烷产量。