Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
J Environ Manage. 2022 Feb 15;304:114315. doi: 10.1016/j.jenvman.2021.114315. Epub 2021 Dec 20.
A novel binder-free anthraquinone (AQS)/polyaniline (PANI) modified carbon felt (CF) cathode for selective HO generation and efficient pollutant removal in electro-Fenton was fabricated by CV electro-deposition method. AQS, the oxygen reduction reaction (ORR) catalyst, was immobilized by the PANI film, which contributed to the obtained high stability of the AQS/PANI@CF cathode. The concentration of the electro-generated HO on AQS/PANI@CF cathode (83.3 μmol L) was about 10 times higher than that of the bare CF cathode. And the high yield of HO was attributed to the catalytic reduction of O by AQS to generate more superoxide radical (O), which combined with H to form HO. Additionally, the rhodamine B (RhB) degradation efficiency reached 98.8% within 60 min with the AQS/PANI@CF served as the cathode with high stability and good repeatability. The main generated reactive radicals were determined by the quenching experiments and the electron paramagnetic resonance (EPR) tests. Besides, a plausible mechanism of the AQS/PANI@CF cathode applied electro-Fenton process was proposed. This work provided a reliable reference for the subsequent investigations of the binder-free cathode with high performance and stability.
一种新型无粘结剂蒽醌 (AQS)/聚苯胺 (PANI) 修饰的碳纤维毡 (CF) 阴极，用于电芬顿中选择性 HO 生成和有效去除污染物，通过 CV 电沉积法制备。AQS 作为氧还原反应 (ORR) 催化剂，被 PANI 膜固定，这有助于获得 AQS/PANI@CF 阴极的高稳定性。在 AQS/PANI@CF 阴极上产生的 HO 浓度（83.3 μmol L）约是裸 CF 阴极的 10 倍。HO 的高产量归因于 AQS 将 O 催化还原生成更多的超氧自由基 (O)，O 与 H 结合生成 HO。此外，以 AQS/PANI@CF 作为阴极，在 60 min 内罗丹明 B (RhB) 的降解效率达到 98.8%，具有高稳定性和良好的可重复性。通过猝灭实验和电子顺磁共振 (EPR) 测试确定了主要生成的活性自由基。此外，还提出了 AQS/PANI@CF 阴极应用电芬顿工艺的合理机制。这项工作为后续研究具有高性能和稳定性的无粘结剂阴极提供了可靠的参考。
