Geng Shuang, Yao Jingang, Wang Lei, Wang Yangyang, Wang Xiaoshu, Li Junmin
School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China.
School of Materials and Environmental Engineering, Institute of Urban Ecology and Environment Technology, Shenzhen Polytechnic University, Shenzhen 518055, China.
Int J Mol Sci. 2024 Dec 19;25(24):13579. doi: 10.3390/ijms252413579.
In the electrocatalytic (EC) degradation process, challenges such as inefficient mass transfer, suboptimal mineralization rates, and limited current efficiency have restricted its broader application. To overcome these obstacles, this study synthesized spherical particle electrodes (FeNi@BC) with superior electrocatalytic performance using a bio-inspired preparation method. A three-dimensional electrocatalytic oxidation system based on FeNi@BC electrode, EC/FeNi@BC, showed excellent degradation efficiency of sulfamethoxazole (SMX), reaching 0.0456 min. Quenching experiments and electron paramagnetic resonance experiments showed that the excellent SMX degradation efficiency in the EC/FeNi@BC system was attributed to the synergistic effect of multiple reactive oxygen species (ROS) and revealed their evolution path. Characterization results showed that FeNi generated in the FeNi@BC electrode was a key bimetallic active site for improving electrocatalytic activity and repolarization ability. More importantly, the degradation pathway and reaction mechanism of SMX in the EC/FeNi@BC system were proposed. In addition, the influencing factors of the reaction system (voltage, pH, initial SMX concentration, electrode dosage, and sodium sulfate concentration, etc.) and the stability of the catalyst (maintained more than 81% after 5 cycles) were systematically evaluated. This study may provide help for the construction of environmentally friendly catalytic and efficient degradation of organic pollutants.
在电催化（EC）降解过程中，传质效率低、矿化率不理想以及电流效率有限等挑战限制了其更广泛的应用。为克服这些障碍，本研究采用仿生制备方法合成了具有优异电催化性能的球形颗粒电极（FeNi@BC）。基于FeNi@BC电极的三维电催化氧化系统EC/FeNi@BC对磺胺甲恶唑（SMX）表现出优异的降解效率，达到0.0456 min⁻¹。猝灭实验和电子顺磁共振实验表明，EC/FeNi@BC系统中优异的SMX降解效率归因于多种活性氧（ROS）的协同作用，并揭示了它们的演变路径。表征结果表明，FeNi@BC电极中生成的FeNi是提高电催化活性和再极化能力的关键双金属活性位点。更重要的是，提出了SMX在EC/FeNi@BC系统中的降解途径和反应机理。此外，还系统评估了反应体系的影响因素（电压、pH值、初始SMX浓度、电极用量和硫酸钠浓度等）以及催化剂的稳定性（5次循环后保持81%以上）。本研究可为构建环境友好型催化高效降解有机污染物提供帮助。
