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二氧化钛 1

氧化降解 1

甲硝唑 1

等离子体耦合旋转圆盘反应器 1

脉冲放电 1

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Degradation of metronidazole by dielectric barrier discharge in an aqueous solution

Zhipeng Yang, Anxing Lai, Hangyu Chen, Youxiang Yan, Ye Yang, Weiwei Zhang, Lei Wang

《环境科学与工程前沿（英文）》 2019年第13卷第3期 doi: 10.1007/s11783-019-1117-4

摘要：

The discharge characteristics during the degradation of MNZ by DBD were investigated.

Increasing the discharge frequency can promote the degradation of MNZ.

MNZ removal reaches 99.1% at the initial concentration of 40 ppm within 120 min.

Coexisting organic matter inhibits the degradation of MNZ.

The energy efficiency of DBD for MNZ removal is higher than other technologies.

关键词： Dielectric barrier discharge Antibiotic Metronidazole Water treatment

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等离子体耦合旋转圆盘反应器协同二氧化钛光催化剂氧化降解水溶液中甲硝唑的研究 Article

蔡勇, 初广文, 罗勇, 苏梦军, 王保举, 孙宝昌, 陈建峰

《工程（英文）》 2021年第7卷第11期页码 1603-1610 doi: 10.1016/j.eng.2020.03.020

摘要：

水体中难降解药物成分污染是一个日益严重的环境问题。等离子体高效氧化技术是一项新兴技术。在本研究中，采用等离子体耦合旋转圆盘反应器（plasma-RDR）与二氧化钛（TiO₂）光催化剂协同处理甲硝唑。Plasma-RDR中的旋转电极可有效提高放电均匀性，提升TiO₂光催化降解效果。研究结果表明，与静止状态相比，当旋转电极转速由0 增至500 r·min⁻¹时，甲硝唑的氧化降解效率和生成的羟基自由基浓度分别提高41%和2.954 mg·L⁻¹。同时，本研究揭示了plasma-RDR 协同TiO₂生成羟基自由基的作用机理。基于三维（3D）荧光光谱（EEFM）和液相色谱-质谱联用（LC-MS）等分析手段，本研究还剖析了甲硝唑主要的氧化降解产物，并提出了甲硝唑可能的降解路径。以上研究表明，等离子体催化氧化工艺对于水体中难降解抗生素的处理具有广阔的应用前景。

关键词：等离子体耦合旋转圆盘反应器脉冲放电甲硝唑氧化降解二氧化钛

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Enhancement of the electrocatalytic oxidation of antibiotic wastewater over the conductive black carbon-PbO

Xiangyu Wang, Yu Xie, Guizhen Yang, Jiming Hao, Jun Ma, Ping Ning

《环境科学与工程前沿（英文）》 2020年第14卷第2期 doi: 10.1007/s11783-019-1201-9

摘要： • A novel conductive carbon black modified lead dioxide electrode is synthesized. • The modified PbO2 electrode exhibits enhanced electrochemical performances. • BBD method could predict optimal experiment conditions accurately and reliably. • The modified electrode possesses outstanding reusability and safety. The secondary pollution caused by modification of an electrode due to doping of harmful materials has long been a big concern. In this study, an environmentally friendly material, conductive carbon black, was adopted for modification of lead dioxide electrode (PbO2). It was observed that the as-prepared conductive carbon black modified electrode (C-PbO2) exhibited an enhanced electrocatalytical performance and more stable structure than a pristine PbO2 electrode, and the removal efficiency of metronidazole (MNZ) and COD by a 1.0% C-PbO2 electrode at optimal conditions was increased by 24.66% and 7.01%, respectively. Results revealed that the electrochemical degradation of MNZ wastewater followed pseudo-first-order kinetics. This intimates that the presence of conductive carbon black could improve the current efficiency, promote the generation of hydroxyl radicals, and accelerate the removal of MNZ through oxidation. In addition, MNZ degradation pathways through a C-PbO2 electrode were proposed based on the identified intermediates. To promote the electrode to treat antibiotic wastewater, optimal experimental conditions were predicted through the Box-Behnken design (BBD) method. The results of this study suggest that a C-PbO2 electrode may represent a promising functional material to pretreat antibiotic wastewaters.

关键词： Conductive carbon black PbO₂ electrode Metronidazole Electrochemical oxidation Box-Behnken design-response surface method