School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China; Key Laboratory of Yellow River Water Environment in Gansu Province, Lanzhou Jiaotong University, Lanzhou, 730070, China.
School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China; Key Laboratory of Yellow River Water Environment in Gansu Province, Lanzhou Jiaotong University, Lanzhou, 730070, China.
Chemosphere. 2022 Jan;287(Pt 4):132397. doi: 10.1016/j.chemosphere.2021.132397. Epub 2021 Sep 28.
Reasonable design of three-dimensional (3D) catalytic particle electrodes (CPEs) is crucial for achieving efficient electrocatalytic oxidation of organic pollutants. Herein, the novel FeO/SnO/GO (FO/SO/GO) particle electrode has been developed and serviced to the 3D electrocatalytic berberine hydrochloride oxidation system with DSA (RuO-IrO-SnO/Ti) electrode as anode and GDE (gas diffusion electrode) electrode as the cathode. Compared with 2D systems and other CPEs, FO/SO/GO electrode shows excellent electrocatalytic activity and remarkable stability for BH removal, that is, the removal rate of BH is 94.8% within 90 min, and the rate constant is 0.03095 min. More importantly, after five cycles, the ternary composite still maintains a strong ability to oxidize pollutants. The structural characterization and electrochemical measurement further uncover that the electron transfer ability and electrocatalytic oxidation efficiency are highly dependent on the surface structure regulation of CPEs. Furthermore, the quenching experiments show that hydroxyl radicals are the main active species in the 3D electro-Fenton (EF) system, which can oxidize BH molecules adsorbed on the surface of GO to CO, HO, or other products. The results could potentially provide new insights for designing and fabricating more stable and efficient 3D CPEs electrocatalytic removal of organic pollutants in the future.
合理设计三维（3D）催化颗粒电极（CPE）对于实现有机污染物的高效电催化氧化至关重要。在此，开发了新型 FeO/SnO/GO（FO/SO/GO）颗粒电极，并将其用于 3D 电催化盐酸小檗碱氧化体系，以 DSA（RuO-IrO-SnO/Ti）电极为阳极，GDE（气体扩散电极）电极为阴极。与 2D 体系和其他 CPE 相比，FO/SO/GO 电极对 BH 的去除具有出色的电催化活性和显著的稳定性，即在 90 分钟内 BH 的去除率为 94.8%，速率常数为 0.03095 min。更重要的是，经过五个循环后，三元复合材料仍保持着很强的氧化污染物的能力。结构表征和电化学测量进一步揭示了电子传递能力和电催化氧化效率高度依赖于 CPE 的表面结构调节。此外，淬灭实验表明，在 3D 电芬顿（EF）体系中，羟基自由基是主要的活性物质，可将吸附在 GO 表面的 BH 分子氧化为 CO、HO 或其他产物。这些结果可能为未来设计和制造更稳定、高效的 3D CPE 电催化去除有机污染物提供新的思路。
