College of Environment, Zhejiang University of Technology, Hangzhou, 310032, China.
College of Environment, Zhejiang University of Technology, Hangzhou, 310032, China.
Chemosphere. 2019 Oct;233:762-770. doi: 10.1016/j.chemosphere.2019.05.226. Epub 2019 May 27.
This work investigated the electrochemical degradation of amoxicillin (AMX) in aqueous solution with Cu-PbO electrode. The main influence factors on the degradation of AMX, such as NaSO concentration, initial AMX concentration, current density and initial pH value, were analyzed in detail. Under the optimal conditions, the removal rates of AMX and chemical oxygen demand (COD) reached 99.4% and 46.3% after 150 min treatment. The results indicated that the electrochemical degradation of AMX fitted pseudo-first-order reaction kinetics. Compared with undoped PbO electrode, Cu-PbO electrode had a smaller crystal size, more proportion of hydroxyl oxygen species, greater AMX and chemical oxygen demand (COD) removal efficiency, higher average current efficiency (ACE) and lower electrical efficiency per log order (EE/O). Electrochemical oxidation using Cu-PbO electrodes was an effective way to eliminate amoxicillin in aqueous solution. Moreover, a possible degradation pathway including ring open and mineralization was proposed by intermediate products determined by GC-MS method. This paper could provide basic data and technique reference for the amoxicillin wastewater pollution control.
本工作采用 Cu-PbO 电极研究了水溶液中阿莫西林（AMX）的电化学降解。详细分析了影响 AMX 降解的主要因素，如 NaSO 浓度、初始 AMX 浓度、电流密度和初始 pH 值。在最佳条件下，经过 150 min 处理，AMX 和化学需氧量（COD）的去除率分别达到 99.4%和 46.3%。结果表明，AMX 的电化学降解符合准一级反应动力学。与未掺杂的 PbO 电极相比，Cu-PbO 电极具有更小的晶体尺寸、更多的羟基氧物种比例、更高的 AMX 和 COD 去除效率、更高的平均电流效率（ACE）和更低的每对数阶电效率（EE/O）。使用 Cu-PbO 电极进行电化学氧化是消除水溶液中阿莫西林的有效方法。此外，通过 GC-MS 方法确定的中间产物提出了可能的降解途径，包括开环和矿化。本文可为阿莫西林废水污染控制提供基础数据和技术参考。
