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《工程(英文)》 >> 2021年 第7卷 第11期 doi: 10.1016/j.eng.2020.03.020

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

a State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
b Research Center of the Ministry of Education for High-Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, China

收稿日期: 2019-07-21 修回日期: 2019-12-18 录用日期: 2020-03-08 发布日期: 2021-10-07

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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。

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