Banana peel-derived porous carbon from natural biowaste had been prepared with different annealing temperatures at 300, 400, 500, 600, and 700 °C. The as-prepared carbon powders were carefully characterized with XRD, SEM, TEM, EIS, and XPS measurements and their antibacterial activities were tested toward Escherichia coli (E. coli - ATCC 25922). It was found that 600 °C as-prepared porous carbon exhibited the most significant inhibitor against E. coli colonies’ growth. It was found that the natural potassium chloride in the banana peel-derived porous carbon played an essential role in preventing the bacterial growth. Furthermore, the as-prepared nanosized porous carbon also directly contacted the bacterial cell wall, which seriously affected the cellular activities, including the metabolic processes and transfer of substances in the cell interfaces. Therefore, the synergistic effect between natural potassium chloride and porous carbon gave rise to antimicrobial activity. The generated electron and hole from low thermal-induced excitation in porous carbon and released electron from potassium significantly deactivated the bacteria activity. The bactericides of banana peel-derived porous carbon were investigated at 37 °C without light illumination and the mechanism of antibacterial growth was elucidated and proposed in this work.

从天然生物废物中提取香蕉皮衍生的多孔碳，在 300、400、500、600 和 700 °C 的不同退火温度下制备。使用 XRD、SEM、TEM、EIS 和 XPS 测量仔细表征所制备的碳粉，并测试它们对大肠杆菌（E.coli - ATCC 25922）的抗菌活性。发现 600 °C 制备的多孔碳对大肠杆菌表现出最显着的抑制剂殖民地的增长。结果表明，香蕉皮衍生的多孔碳中的天然氯化钾在防止细菌生长方面发挥了重要作用。此外，所制备的纳米多孔碳还直接接触细菌细胞壁，严重影响细胞活动，包括细胞界面中的代谢过程和物质转移。因此，天然氯化钾和多孔碳之间的协同作用产生了抗菌活性。多孔碳中低热诱导激发产生的电子和空穴以及钾释放的电子显着降低了细菌的活性。