Advanced oxidation processes based on carbon catalysis is a promising strategy possessing great potential for environmental pollution degradation. Herein, nitrogen-doped biochar nanosheets (NCS-x) were synthesized using a nitrogen-rich biomass (Candida utilis) as sole precursor. The involvement of environmental-friendly molten salt (NaCl and KCl) in pyrolysis process not only facilitated the exfoliation of biochar, but also favored the retention of N element in biochar. When applying as catalyst for peroxymonosulfate activation, the as-obtained NCS-6 exhibited outstanding performance in catalytic degradation of bisphenol A (BPA). A 100% removal efficiency was observed in 6 min with fast reaction kinetic (k = 1.36 min⁻¹). Based on quenching test and in-situ electron paramagnetic resonance analysis, both radical pathway and non-radical pathway were suggested to be involved in BPA degradation, while singlet oxygen was identified as the dominant reactive oxygen species. Furthermore, the ecotoxicity evaluation using Chlorella vulgaris as ecological indicator indicated that BPA solution after degradation was less toxic than the original solution. It is expected that this green and facile strategy holds great promise for value-added conversion of nitrogen-rich biomass to highly efficient biochar nanosheets for environment remediation.

基于碳催化的高级氧化工艺是一种很有前途的策略，具有巨大的环境污染降解潜力。在此，使用富氮生物质（假丝酵母）作为唯一的前驱体合成了氮掺杂生物炭纳米片（NCS-x）。环保的熔融盐（NaCl和KCl）参与热解过程不仅促进了生物炭的剥落，而且有利于氮在生物炭中的保留。当用作过氧单硫酸盐活化的催化剂时，如此获得的NCS-6在双酚A（BPA）的催化降解中表现出优异的性能。在6分钟内观察到100％的去除效率，反应动力学快（k  = 1.36 min ^-1）。基于猝灭试验和原位电子顺磁共振分析，表明自由基途径和非自由基途径均与BPA降解有关，而单线态氧被确定为主要的活性氧。此外，使用寻常小球藻作为生态指标的生态毒性评估表明，降解后的BPA溶液的毒性低于原始溶液。可以预期，这种绿色且简便的策略有望将富氮生物质增值转化为用于环境修复的高效生物炭纳米片。