In this study, a novel nitrogen-doped biochar oxygen reduction reaction cathode-water hyacinth carbon, was prepared by ZnCl₂ molten salt carbonization without additional nitrogen source, which displayed a high performance in electro-Fenton (E-Fenton) process. The BET result shows that water hyacinth carbon achieved a much larger specific surface area (829 m²·g⁻¹) than non-melt salt carbonized one (323 m²·g⁻¹) and graphite powder (28 m²·g⁻¹). Furthermore, characterization by XPS and EIS shows that both pyridinic-N (43.24%) and graphitic-N (56.75%) existed in water hyacinth carbon and Warburg constant was only 0.051. Because of a high H₂O₂ producing yield 1.7 mmol·L⁻¹ and corresponding current efficiency 81.2 ± 2.5% in molten salt carbonized water hyacinth biochar, a high kinetic constant 0.318 min⁻¹ in DMP degradation was achieved, which was 4 times higher than graphite powder (0.076 min⁻¹). The TOC removal achieved 86.8% in 30 min and the corresponding energy consumption reached a low level 60.15 kW·h·kgTOC⁻¹.

本研究通过不加氮源的ZnCl ₂熔融盐碳化制备了一种新型的氮掺杂生物炭氧还原反应阴极水葫芦碳，在电芬顿（E-Fenton）工艺中表现出很高的性能。BET结果表明，水葫芦碳的比表面积（829 m ² ·g ^-1）比未熔融盐碳化的碳酸盐（323 m ² ·g ^-1）和石墨粉（28 m ² ·g- ）大得多^{。 1}）。此外，通过XPS和EIS进行的表征显示，水葫芦碳中同时存在吡啶二氮（43.24％）和石墨化N（56.75％），并且Warburg常数仅为0.051。由于H ₂高在熔融盐碳化水葫芦生物炭中产生O _2的产量为1.7mmol·L ^-1，相应的电流效率为81.2±2.5％，DMP降解的动力学常数高达0.318 min ^-1，是石墨粉的0.04倍（0.076） min ^-1）。30分钟内TOC去除率达到86.8％，相应的能耗达到60.15 kW·h·kgTOC ^-1的低水平。