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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
Yong Cai, Guang-Wen Chu, Yong Luo, Meng-Jun Su, Bao-Ju Wang, Bao-Chang Sun, Jian-Feng Chen
工程（英文） ›› 2021, Vol. 7 ›› Issue (11) : 1603-1610.
PDF(2288 KB)
PDF(2288 KB)
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
An Evaluation of Metronidazole Degradation in a Plasma-Assisted Rotating Disk Reactor Coupled with TiO2 in Aqueous Solution
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。
Pollution involving pharmaceutical components in bodies of water is an increasingly serious environmental issue. Plasma discharge for the degradation of antibiotics is an emerging technology that may be relevant toward addressing this issue. In this work, a plasma-assisted rotating disk reactor (plasma-RDR) and a photocatalyst—namely, titanium dioxide (TiO2)—were coupled for the treatment of metronidazole (MNZ). Discharge uniformity was improved by the use of a rotating electrode in the plasma-RDR, which contributed to the utilization of ultraviolet (UV) light radiation in the presence of TiO2. The experimental results showed that the degradation efficiency of MNZ and the concentration of generated hydroxyl radicals respectively increased by 41% and 2.954 mg·L−1 as the rotational speed increased from 0 to 500 r·min−1. The synergistic effect of plasma-RDR plus TiO2 on the generation of hydroxyl radicals was evaluated. Major intermediate products were identified using three-dimensional (3D) excitation emission fluorescence matrices (EEFMs) and liquid chromatography–mass spectrometry (LC-MS), and a possible degradation pathway is proposed herein. This plasma-catalytic process has bright prospects in the field of antibiotics degradation.
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
Plasma-assisted rotating disk reactor / Pulsed discharge / Metronidazole / Degradation / TiO2
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