National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang Hangkong University, Nanchang, 330063, PR China; Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang, 330063, PR China.
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing, 100124, PR China.
Environ Res. 2020 Dec;191:110212. doi: 10.1016/j.envres.2020.110212. Epub 2020 Sep 12.
Bioelectrochemical systems (BESs) exhibit great potential for simultaneous wastewater treatment and energy recovery. However, the efficiency of microbial electrocatalysis is fundamentally limited by the high resistance and poor biocompatibility of electrode materials. Herein, we construct a novel "binder-free" 3D biocompatible bioelectrode consists of 1D aminated carbon nanotubes (CNTs-NH) and 2D conductive reduced graphene oxide (rGO) nanosheets through one-step electrodeposition. As expected, the maximum current density reached to 3.25 ± 0.03 mA cm with the rGO@CNTs-NH electrode, which is 4.33-fold higher than that of a bare rGO (0.75 ± 0.01 mA cm), and is among the best performance reported for three-dimensional electrodes. The high microbial electrocatalytic activity is mainly attributed to the excellent performance of electron transfer and bacterial colonization, which originates from the 3D interconnecting scaffold, fast 1D CNTs "e-bridge" and positively charged surface.
生物电化学系统（BESs）在同时进行废水处理和能量回收方面表现出巨大的潜力。然而，微生物电催化的效率从根本上受到电极材料高电阻和差生物相容性的限制。在此，我们通过一步电沉积构建了一种新型的“无粘结剂”3D 生物相容性生物电极，由 1D 氨基化碳纳米管（CNTs-NH）和 2D 导电还原氧化石墨烯（rGO）纳米片组成。不出所料，rGO@CNTs-NH 电极的最大电流密度达到 3.25±0.03 mA cm，是裸 rGO（0.75±0.01 mA cm）的 4.33 倍，在三维电极中属于性能最好的之一。高微生物电催化活性主要归因于电子转移和细菌定殖的优异性能，这源于 3D 互连支架、快速 1D CNTs“电子桥”和带正电荷的表面。
