N- and O self-doped biomass porous carbon cathode in an electro-Fenton system for Chloramphenicol degradation
N- and O self-doped biomass porous carbon cathode in an electro-Fenton system for Chloramphenicol degradation
复制标题
用于氯霉素降解的电芬顿系统中的 N 和 O 自掺杂生物质多孔碳阴极
DOI：
10.1016/j.seppur.2020.117376
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发表时间：
2020-11-15
影响因子：
8.6
通讯作者：
Tsang, Yiu Fai
中科院分区：
文献类型：
--
作者：
Hu, Xia;Deng, Yu;Tsang, Yiu Fai
电芬顿体系阴极催化剂具有高活性、高选择性和高稳定性，是高效电化学产生H2 O2的必要条件。为此，以黑豆为原料，制备了氮氧自掺杂生物质多孔炭（NOBPC），并将其作为阴极材料用于EF体系中氯霉素的降解。NOBPC阴极材料具有较大的比表面积（663.6m2/g）、丰富的孔结构和氮氧掺杂量，有利于溶解氧的扩散，提高了电芬顿活性和稳定性。在pH 1、-0.7VvsSCE条件下，H2 O2的最大产率可达6.32mmol/L/h。在最佳条件下（-0.5V，pH = 3，Fe 2+浓度为1.0mmol/L），氯霉素的去除率在80 min内可达100%。更重要的是，通过LC-MS研究了氯霉素的降解机理：氯霉素的C-Cl键易被OH氧化，苯环断裂，进一步转化为小分子。
Cathode catalysts of electro-Fenton (EF) system with high activity, selectivity and stability are necessary for efficient electrochemical H2O2 generation. To this end, the N-and O self-doped biomass porous carbon (NOBPC) are synthesized by black soya bean, which was as cathode materials in the EF system for the degradation of Chloramphenicol. The NOBPC cathode material exhibits large surface area (663.6 m(2)/g), plentiful porous structure and doping contents of nitrogen and oxygen, which facilitates dissolved O-2 diffusion and enhances the electro-Fenton activity and stability. The maximum H2O2 production rate could reach 6.32 mmol/L/h at pH 1, -0.7 V vs SCE. Moreover, the removal efficiency of Chloramphenicol achieves 100% in 80 min at the optimum condition (-0.5 V, pH 3 and Fe2+ 1.0 mmol/L). More importantly, the possible degradation mechanism is investigated by LC-MS. The C-Cl bond of Chloramphenicol was easily oxidized by 'OH, and then the cleavage of the benzene ring appeared and further transformed into small molecules.