Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an, People's Republic of China.
College of literature, Xi'an University of Architecture and Technology, Xi'an, People's Republic of China.
Environ Technol. 2024 Apr;45(9):1669-1682. doi: 10.1080/09593330.2022.2150093. Epub 2022 Dec 6.
Herein, a carbon felt (CF) cathode modified by the acidic oxidised carbon nanotubes (OCNTs) exhibited a high yield of the HO generation in electro-Fenton. Rotating disk electrode (RDE) measurements showed that the selective generation of HO occurred on the CF cathode coated by OCNTs (OCNTs/CF), which was attributed to the high amount of oxygen-containing functional groups in OCNTs. Moreover, the pollutant degradation efficiency could almost reach 100% within 60 min in electro-Fenton with OCNTs/CF as the cathode. Furthermore, the pollutant removal efficiency was kept constant after five consecutive cycles, indicating the high stability of OCNTs/CF cathode. Besides, the hydrophilicity of OCNTs/CF cathode was significantly enhanced owing to the abundant oxygen-contained functional groups on the surface of the OCNTs/CF cathode, which facilitated the mass transfer between the OCNTs/CF cathode and the reactants in the bulk solution. To reveal the possible mechanism in electro-Fenton equipped with the OCNTs/CF cathode, quenching experiments and electron paramagnetic resonance (EPR) investigations were further conducted. This work provided valuable insights into the fabrication of the non-metallic cathode with a high ability towards HO generation in electro-Fenton for efficient pollutant removal.
在此，通过酸性氧化的碳纳米管（OCNTs）对碳毡（CF）阴极进行修饰，在电芬顿中表现出高的 HO 生成产率。旋转圆盘电极（RDE）测量表明，选择性地在涂覆有 OCNTs 的 CF 阴极（OCNTs/CF）上发生 HO 的生成，这归因于 OCNTs 中大量的含氧官能团。此外，在以 OCNTs/CF 为阴极的电芬顿中，污染物的降解效率在 60 分钟内几乎可达 100%。此外，在五个连续循环后，污染物去除效率保持不变，表明 OCNTs/CF 阴极具有高稳定性。此外，由于 OCNTs/CF 阴极表面丰富的含氧官能团，OCNTs/CF 阴极的亲水性得到了显著提高，这促进了 OCNTs/CF 阴极与体相溶液中反应物之间的传质。为了揭示在配备 OCNTs/CF 阴极的电芬顿中可能的机制，进一步进行了猝灭实验和电子顺磁共振（EPR）研究。这项工作为在电芬顿中制备具有高 HO 生成能力的非金属阴极以有效去除污染物提供了有价值的见解。
