Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China; Department of Environmental Engineering, Shanxi University, Taiyuan 030006, Shanxi, China.
Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China.
Sci Total Environ. 2019 Nov 10;690:654-666. doi: 10.1016/j.scitotenv.2019.06.527. Epub 2019 Jul 3.
Potassium monopersulfate (PMS) without a catalyst as cathode electron acceptor was first established to improve the electricity generation performance of a microbial fuel cell (MFC) in this study. The work investigated the performance with pure PMS (PPMS) and compound PMS (CPMS). The concentration and initial pH of PMS had an effect on the electricity generation, which increased with higher PMS concentration and lower catholyte pH. In the PPMS-MFC system, the maximum voltage (0.972 V), power density (16.37 W/m), optimal exchange current density (2.000 A/m) and minimum polarization impedance (Rp: 97.33 Ω) were reached at 10 mM PMS and pH 3.0. However, the maximum power density (8.60 W/m) was exhibited at 70 mM PMS and pH 3.0 in the CPMS system. Additionally, high COD removals of 99.41% and 98.71% in anode chambers were obtained in the two systems, respectively. Sulfate radicals (SO) and hydroxyl radicals (OH) played significant roles in the PPMS-MFC, while HClO was also a contributor in addition to SO and OH in the CPMS-MFC. Furthermore, SO and OH was generated in situ in the cathode to promote the reduction reaction. The inorganic anion had different effects on electricity generation. Finally, while energy was recovered, rhodamine B (RhB) was added to the cathode chamber and then removed successfully in PPMS-MFC system. This work confirmed that only PMS could be activated by bio-electrochemical method, which is an energy-saving, environmentally friendly and effective activation approach, and thus, it could be used as an efficient acceptor in a MFC.
过一硫酸氢钾（PMS）无需催化剂作为阴极电子受体，首次被应用于提高微生物燃料电池（MFC）的发电性能。本研究考察了纯过一硫酸氢钾（PPMS）和复合过一硫酸氢钾（CPMS）的性能。PMS 的浓度和初始 pH 值对发电有影响，随着 PMS 浓度的增加和阴极液 pH 值的降低，发电性能得到提高。在 PPMS-MFC 系统中，在 10 mM PMS 和 pH 3.0 时，达到了最大电压（0.972 V）、最大功率密度（16.37 W/m）、最佳交换电流密度（2.000 A/m）和最小极化阻抗（Rp：97.33 Ω）。然而，在 CPMS 系统中，在 70 mM PMS 和 pH 3.0 时，达到了最大功率密度（8.60 W/m）。此外，两个系统的阳极室都获得了高达 99.41%和 98.71%的 COD 去除率。在 PPMS-MFC 中，硫酸根自由基（SO）和羟基自由基（OH）发挥了重要作用，而在 CPMS-MFC 中，除了 SO 和 OH 之外，次氯酸（HClO）也是一个贡献者。此外，SO 和 OH 在阴极原位生成，促进了还原反应。无机阴离子对发电有不同的影响。最后，在回收能量的同时，罗丹明 B（RhB）被添加到阴极室，并在 PPMS-MFC 系统中成功去除。本研究证实，只有 PMS 可以通过生物电化学方法激活，这是一种节能、环保和有效的激活方法，因此可以作为 MFC 中的高效受体。
